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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 9,459,000     9,459,000  
Net unrealized gain on securities available for sale, net of tax 2,087,000       2,087,000
Amortization of unrecognized postretirement benefits, net of tax 15,000       15,000
Comprehensive income 11,561,000     9,459,000 2,102,000
Dividends, Preferred Stock (469,000)     (469,000)  
Dividends, Common Stock, Cash 5,763,000     5,763,000  
Equity compensation expense 57,000   57,000    
Amortization of premium for preferred stock issuance   74,000 (74,000)    
Proceeds from sale of common stock (in shares)     41,216    
Proceeds from sale of common stock 393,000   393,000    
Balance, ending period at Sep. 30, 2012 156,637,000 12,377,000 46,303,000 88,541,000 9,416,000
Balance, ending balance (in shares) at Sep. 30, 2012 9,853,396   9,853,396    
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 9,463,000     9,463,000  
Net unrealized gain on securities available for sale, net of tax (12,152,000)       (12,152,000)
Amortization of unrecognized postretirement benefits, net of tax 8,000       8,000
Comprehensive income (2,681,000)     9,463,000 (12,144,000)
Dividends, Preferred Stock (286,000)     (286,000)  
Cash dividends declared (2012: 0.585 per share, 2013: $0.585 per shares) (6,236,000)     (6,236,000)  
Equity compensation expense 161,000   161,000    
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)     805,464    
Proceeds from sale of common stock 11,872,000   11,872,000    
Balance, ending period at Sep. 30, 2013 $ 146,653,000 $ 0 $ 58,347,000 $ 92,633,000 $ (4,327,000)
Balance, ending balance (in shares) at Sep. 30, 2013 10,665,378   10,665,378