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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Purchase of Common Shares Outstanding [Member]
Treasury Stock [Member]
Shares Purchased To Fund Options Exercised [Member]
Treasury Stock [Member]
Restricted Stock Awards Repurchased To Satisfy Tax Obligations [Member]
Treasury Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance, beginning of period at Dec. 31, 2013 $ 315 $ 201,902       $ (22,053) $ 263,743 $ (11,375)  
Common Stock                  
Change in net unrealized gains (losses) on securities available for sale, net of taxes of approximately $833 and ($9,141) for the six months ended June 30, 2015 and 2014, respectively               11,873 $ 11,873
Amortization of actuarial losses, net of taxes of approximately ($268) and ($189) for the six months ended June 30, 2015 and 2014, respectively               161 (161)
Amortization of prior service credits, net of taxes of approximately $10 and $13 for the six months ended June 30, 2015 and 2014, respectively)               (10)  
Net income             21,981   21,981
Cash dividends declared and paid on common shares ($0.32 and $0.30 per common share for the six months ended June 30, 2015 and 2014, respectively)             (9,015)    
Award of common shares released from Employee Benefit Trust (136,114 and 129,694 common shares for the six months ended June 30, 2015 and 2014, respectively)   1,975              
Shares issued upon vesting of restricted stock unit awards   9       2,972 (395)    
Issuance upon exercise of stock options   296       1,608 (45)   1,290
Stock-based compensation activity, net   392              
Stock-based income tax benefit   748              
Balance, end of period at Jun. 30, 2014 315 205,322       (22,048) 276,269 649 460,507
Treasury Stock                  
Purchases of outstanding shares     $ (2,143) $ (1,290) $ (1,142)        
Balance, beginning of period at Dec. 31, 2014 315 206,437       (37,221) 289,623 (2,907) 456,247
Common Stock                  
Change in net unrealized gains (losses) on securities available for sale, net of taxes of approximately $833 and ($9,141) for the six months ended June 30, 2015 and 2014, respectively               (1,145) (1,145)
Reclassification adjustment for loss included in net income, net of taxes of approximately $28 for the six months ended June 30, 2015               (36) 36
Amortization of actuarial losses, net of taxes of approximately ($268) and ($189) for the six months ended June 30, 2015 and 2014, respectively               345 (345)
Amortization of prior service credits, net of taxes of approximately $10 and $13 for the six months ended June 30, 2015 and 2014, respectively)               (13)  
Net income             23,567   23,567
Cash dividends declared and paid on common shares ($0.32 and $0.30 per common share for the six months ended June 30, 2015 and 2014, respectively)             (9,379)    
Award of common shares released from Employee Benefit Trust (136,114 and 129,694 common shares for the six months ended June 30, 2015 and 2014, respectively)   1,969              
Shares issued upon vesting of restricted stock unit awards   160       3,577 (503)    
Issuance upon exercise of stock options   8       174 (8)   20
Stock-based compensation activity, net   303              
Stock-based income tax benefit   380              
Balance, end of period at Jun. 30, 2015 $ 315 $ 209,257       $ (46,980) $ 303,300 $ (3,756) $ 462,136
Treasury Stock                  
Purchases of outstanding shares     $ (12,380) $ (20) $ (1,110)