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Consolidated Statements of Changes in Shareholders' Equity (Audited) (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, 2009 $ 24,606,000 $ 45,218,000 $ 78,450,000 $ (336,000) $ 147,938,000
Balance (in shares) at Dec. 31, 2009   9,744,170      
Net income 0 0 12,116,000 0 12,116,000
Net unrealized gain on securities available for sale, net of taxes 0 0 0 (1,932,000) (1,932,000)
Unrecognized transition obligation for postretirement benefits, net of taxes 0 0 0 138,000 138,000
Comprehensive income 0 0 12,116,000 (1,794,000) 10,322,000
Cash dividends declared 0 0 (8,865,000) 0 (8,865,000)
Equity compensation expense 0 37,000 0 0 37,000
Amortization of premium for preferred stock issuance 99,000 (99,000) 0 0 0
Repurchase of preferred stock         0
Proceeds from sale of common stock 0 416,000 0 0 416,000
Proceeds from sale of common stock (in shares)   28,855      
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 12,364,000 0 12,364,000
Net unrealized gain on securities available for sale, net of taxes 0 0 0 9,458,000 9,458,000
Unrecognized transition obligation for postretirement benefits, net of taxes 0 0 0 (14,000) (14,000)
Comprehensive income 0 0 12,364,000 9,444,000 21,808,000
Cash dividends declared 0 0 (8,751,000) 0 (8,751,000)
Equity compensation expense 0 22,000 0 0 22,000
Amortization of premium for preferred stock issuance 98,000 (98,000) 0 0 0
Repurchase of preferred stock (12,500,000) 0 0 0 (12,500,000)
Proceeds from sale of common stock 0 431,000 0 0 431,000
Proceeds from sale of common stock (in shares)   39,155      
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 12,688,000 0 12,688,000
Net unrealized gain on securities available for sale, net of taxes 0 0 0 539,000 539,000
Unrecognized transition obligation for postretirement benefits, net of taxes 0 0 0 (36,000) (36,000)
Comprehensive income 0 0 12,688,000 503,000 13,191,000
Cash dividends declared 0 0 (8,310,000) 0 (8,310,000)
Equity compensation expense 0 85,000 0 0 85,000
Amortization of premium for preferred stock issuance 99,000 (99,000) 0 0 0
Repurchase of preferred stock         0
Proceeds from sale of common stock 0 499,000 0 0 499,000
Proceeds from sale of common stock (in shares)   47,734      
Balance at Dec. 31, 2012 $ 12,402,000 $ 46,412,000 $ 89,692,000 $ 7,817,000 $ 156,323,000
Balance (in shares) at Dec. 31, 2012   9,859,914     9,859,914