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Consolidated Statements of Changes in Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Balance at beginning of period $ 63,755 $ 57,291 $ 62,960 $ 56,089
Comprehensive income:        
Net income 1,620 1,679 2,974 2,851
Net unrealized change on securities available-for-sale, net of reclassifications and tax effects 50 576 (117) 992
Amortization of unrecognized gain on postretirement benefit (1) (2) (3) (4)
Comprehensive income 1,669 2,253 2,854 3,839
Stock based compensation expense 4 9 8 18
Sale of treasury stock 32 30 63 61
Cash dividends (539) (425) (964) (849)
Balance at end of period $ 64,921 $ 59,158 $ 64,921 $ 59,158