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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 [Member]
Balance, beginning balance at Dec. 31, 2011 $ 150,858,000 $ 12,303,000 $ 45,927,000 $ 85,314,000 $ 7,314,000
Balance, beginning period (in shares) at Dec. 31, 2011     9,812,180    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 6,236,000     6,236,000  
Net unrealized gain on securities available for sale, net of tax 125,000       125,000
Amortization of unrecognized postretirement benefits, net of tax 10,000       10,000
Comprehensive income 6,371,000     6,236,000 135,000
Cash dividends declared (2012: 0.195 per share, 2013: $0.195 per shares) (4,154,000)     (4,154,000)  
Equity compensation expense 40,000   40,000    
Amortization of premium for preferred stock issuance   49,000 (49,000)    
Proceeds from sale of common stock (in shares)     34,979    
Proceeds from sale of common stock 290,000   290,000    
Balance, ending period at Jun. 30, 2012 153,405,000 12,352,000 46,208,000 87,396,000 7,449,000
Balance, ending balance (in shares) at Jun. 30, 2012 9,847,159   9,847,159    
Balance, beginning balance at Dec. 31, 2012 156,323,000 12,402,000 46,412,000 89,692,000 7,817,000
Balance, beginning period (in shares) at Dec. 31, 2012 9,859,914   9,859,914    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 6,098,000     6,098,000  
Net unrealized gain on securities available for sale, net of tax (11,373,000)       (11,373,000)
Amortization of unrecognized postretirement benefits, net of tax 8,000       8,000
Comprehensive income (5,267,000)     6,098,000 (11,365,000)
Cash dividends declared (2012: 0.195 per share, 2013: $0.195 per shares) (4,442,000)     (4,442,000)  
Equity compensation expense 107,000   107,000    
Amortization of premium for preferred stock issuance   98,000 (98,000)    
Payment to repurchase preferred stock (12,500,000) (12,500,000)      
Proceeds from sale of common stock (in shares)     799,850    
Proceeds from sale of common stock 11,751,000   11,751,000    
Balance, ending period at Jun. 30, 2013 $ 145,972,000 $ 0 $ 58,172,000 $ 91,348,000 $ (3,548,000)
Balance, ending balance (in shares) at Jun. 30, 2013 10,659,764   10,659,764