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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $)
Preferred stock [Member]
Common stock and additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Total
Balance at Dec. 31, 2010 $ 24,705,000 $ 45,572,000 $ 81,701,000 $ (2,130,000) $ 149,848,000
Balance (in shares) at Dec. 31, 2010   9,773,025      
Net income 0 0 9,341,000 0 9,341,000
Net unrealized gain on securities available for sale, net of taxes 0 0 0 10,212,000 10,212,000
Unrecognized transition obligation for postretirement benefits, net of taxes 0 0 0 14,000 14,000
Comprehensive income 0 0 9,341,000 10,226,000 19,567,000
Cash dividends declared 0 0 (6,682,000) 0 (6,682,000)
Equity compensation expense 0 17,000 0 0 17,000
Amortization of premium for preferred stock issuance 73,000 (73,000) 0 0 0
Repurchase of preferred stock (12,500,000) 0 0 0 (12,500,000)
Proceeds from sale of common stock 0 288,000 0 0 288,000
Proceeds from sale of common stock (in shares)         27,482
Balance at Sep. 30, 2011 12,278,000 45,804,000 84,360,000 8,096,000 150,538,000
Balance (in shares) at Sep. 30, 2011   9,800,507     9,800,507
Balance at Dec. 31, 2011 12,303,000 45,927,000 85,314,000 7,314,000 150,858,000
Balance (in shares) at Dec. 31, 2011   9,812,180     9,812,180
Net income 0 0 9,459,000 0 9,459,000
Net unrealized gain on securities available for sale, net of taxes 0 0 0 2,087,000 2,087,000
Unrecognized transition obligation for postretirement benefits, net of taxes 0 0 0 15,000 15,000
Comprehensive income 0 0 9,459,000 2,102,000 11,561,000
Cash dividends declared 0 0 (6,232,000) 0 (6,232,000)
Equity compensation expense 0 57,000 0 0 57,000
Amortization of premium for preferred stock issuance 74,000 (74,000) 0 0 0
Repurchase of preferred stock         0
Proceeds from sale of common stock 0 393,000 0 0 393,000
Proceeds from sale of common stock (in shares)         41,216
Balance at Sep. 30, 2012 $ 12,377,000 $ 46,303,000 $ 88,541,000 $ 9,416,000 $ 156,637,000
Balance (in shares) at Sep. 30, 2012   9,853,396     9,853,396