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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $)
Total
Preferred stock [Member]
Common stock and additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Balance at Dec. 31, 2009$ 147,938,000$ 24,606,000$ 45,218,000$ 78,450,000$ (336,000)
Balance (in shares) at Dec. 31, 20099,744,170 9,744,170  
Net income9,039,000  9,039,000 
Net unrealized gain on securities available for sale, net of taxes1,546,000   1,546,000
Unrecognized transition obligation for postretirement benefits, net of taxes14,000   14,000
Comprehensive income10,599,000  9,039,0001,560,000
Cash dividends declared(6,646,000)  (6,646,000) 
Equity compensation expense28,000 28,000  
Amortization of premium for preferred stock issuance 74,000(74,000)  
Proceeds from sale of common stock311,000 311,000  
Proceeds from sale of common stock (in shares)  21,461  
Balance at Sep. 30, 2010152,230,00024,680,00045,483,00080,843,0001,224,000
Balance (in shares) at Sep. 30, 20109,765,631 9,765,631  
Balance at Dec. 31, 2010149,848,00024,705,00045,572,00081,701,000(2,130,000)
Balance (in shares) at Dec. 31, 20109,773,025 9,773,025  
Net income9,341,000  9,341,000 
Net unrealized gain on securities available for sale, net of taxes10,212,000   10,212,000
Unrecognized transition obligation for postretirement benefits, net of taxes14,000   14,000
Comprehensive income19,567,000  9,341,00010,226,000
Cash dividends declared(6,682,000)  (6,682,000) 
Equity compensation expense17,000 17,000  
Amortization of premium for preferred stock issuance 73,000(73,000)  
Repurchase of preferred stock(12,500,000)(12,500,000)   
Proceeds from sale of common stock288,000 288,000  
Proceeds from sale of common stock (in shares)  27,482  
Balance at Sep. 30, 2011$ 150,538,000$ 12,278,000$ 45,804,000$ 84,360,000$ 8,096,000
Balance (in shares) at Sep. 30, 20119,800,507 9,800,507