Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000715579 (http://www.sec.gov/CIK)

Income Tax Disclosure [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The components of income tax expense for the years ended December 31, 2016, 2015 and 2014, are as follows: In thousands 2016   2015   2014 Federal:           Current $ 3,530   $ 3,316   $ 2,152 Deferred 171   392   875   3,701   3,708   3,027 State:           Current 67   53   53   $ 3,768   $ 3,761   $ 3,080
Schedule of Reconciliations of the Statutory Federal Income Tax	Reconciliations of the statutory federal income tax to the income tax expense reported in the consolidated statements of income for the years ended December 31, 2016, 2015 and 2014, are as follows:   Percentage of Income before Income Taxes   2016   2015   2014 Federal income tax at statutory rate 34.0  %   34.0  %   34.0  % State income taxes, net of federal benefit 0.3  %   0.2  %   0.3  % Tax-exempt income (4.8 )%   (4.4 )%   (3.5 )% Earnings on investment in bank-owned life insurance (2.6 )%   (2.5 )%   (2.8 )% Rehabilitation and low-income housing credits (2.0 )%   (2.0 )%   (5.1 )% Other 0.8  %   0.2  %   0.1  %   25.7  %   25.5  %   23.0  %
Components of Deferred Tax Assets and Liabilities	Components of deferred tax assets and liabilities at December 31 were as follows: In thousands 2016   2015 Deferred tax assets:       Allowance for loan losses $ 4,968   $ 5,014 Available for sale securities 143   — Accrued deferred compensation 1,166   1,008 Pension 3,101   3,034 Deferred loan fees —   4 Other-than-temporary impairment 70   178 Nonaccrual interest 226   168 Deferred director fees 686   576 Other 982   644   11,342   10,626 Deferred tax liabilities:       Deferred loan fees 79   — Available for sale securities —   600 Prepaid pension benefit cost 6,632   6,505 Prepaid expenses 123   166 Accumulated depreciation 372   331 Goodwill/intangibles 1,006   873   8,212   8,475 Net Deferred Tax Asset $ 3,130   $ 2,151