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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 6,336,000 0 6,336,000
Net unrealized gain on securities available for sale, net of taxes 0 0 0 4,255,000 4,255,000
Unrecognized transition obligation for postretirement benefits, net of taxes 0 0 0 10,000 10,000
Comprehensive income 0 0 6,336,000 4,265,000 10,601,000
Cash dividends declared 0 0 (4,443,000) 0 (4,443,000)
Equity compensation expense 0 11,000 0 0 11,000
Amortization of premium for preferred stock issuance 49,000 (49,000) 0 0 0
Proceeds from sale of common stock 0 193,000 0 0 193,000
Proceeds from sale of common stock (in shares)   20,681      
Balance at Jun. 30, 2011 24,754,000 45,727,000 83,594,000 2,135,000 156,210,000
Balance (in shares) at Jun. 30, 2011   9,793,706     9,793,706
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 6,236,000 0 6,236,000
Net unrealized gain on securities available for sale, net of taxes 0 0 0 125,000 125,000
Unrecognized transition obligation for postretirement benefits, net of taxes 0 0 0 10,000 10,000
Comprehensive income 0 0 6,236,000 135,000 6,371,000
Cash dividends declared 0 0 (4,154,000) 0 (4,154,000)
Equity compensation expense 0 40,000 0 0 40,000
Amortization of premium for preferred stock issuance 49,000 (49,000) 0 0 0
Proceeds from sale of common stock 0 290,000 0 0 290,000
Proceeds from sale of common stock (in shares)   34,979      
Balance at Jun. 30, 2012 $ 12,352,000 $ 46,208,000 $ 87,396,000 $ 7,449,000 $ 153,405,000
Balance (in shares) at Jun. 30, 2012   9,847,159     9,847,159