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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 ($2,230) and ($7,484) for the nine months ended September 30, 2015 and 2014, respectively               9,667 $ 9,667
Reclassification adjustment for net gains included in net income, net of taxes of approximately $73 and $2,238 for the nine months ended September 30, 2015 and 2014, respectively               (2,978) 2,978
Amortization of actuarial losses, net of taxes of approximately ($402) and ($266) for the nine months ended September 30, 2015 and 2014, respectively               259 (259)
Amortization of prior service credits, net of taxes of approximately $15 and $18 for the nine months ended September 30, 2015 and 2014, respectively)               (16)  
Net income             33,182   33,182
Cash dividends declared and paid on common shares ($0.48 and $0.45 per common share for the nine months ended September 30, 2015 and 2014, respectively)             (13,461)    
Award of common shares released from Employee Benefit Trust (143,809 and 133,446 common shares for the nine months ended September 30, 2015 and 2014, respectively)   2,029              
Shares issued upon vesting of restricted stock unit awards   30       3,137 (405)    
Issuance upon exercise of stock options   310       1,697 (50)   1,290
Stock-based compensation activity, net   801              
Stock-based income tax benefit   757              
Balance, end of period at Sep. 30, 2014 315 205,829       (32,314) 283,009 (4,443) 452,396
Treasury Stock                  
Purchases of outstanding shares     $ (12,660) $ (1,290) $ (1,145)        
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 ($2,230) and ($7,484) for the nine months ended September 30, 2015 and 2014, respectively               2,798 2,798
Reclassification adjustment for net gains included in net income, net of taxes of approximately $73 and $2,238 for the nine months ended September 30, 2015 and 2014, respectively               (94) 94
Amortization of actuarial losses, net of taxes of approximately ($402) and ($266) for the nine months ended September 30, 2015 and 2014, respectively               518 (518)
Amortization of prior service credits, net of taxes of approximately $15 and $18 for the nine months ended September 30, 2015 and 2014, respectively)               (19)  
Net income             34,575   34,575
Cash dividends declared and paid on common shares ($0.48 and $0.45 per common share for the nine months ended September 30, 2015 and 2014, respectively)             (13,999)    
Award of common shares released from Employee Benefit Trust (143,809 and 133,446 common shares for the nine months ended September 30, 2015 and 2014, respectively)   2,031              
Shares issued upon vesting of restricted stock unit awards   160       3,580 (504)    
Issuance upon exercise of stock options   52       813 (179)   441
Stock-based compensation activity, net   789              
Stock-based income tax benefit   467              
Balance, end of period at Sep. 30, 2015 $ 315 $ 209,936       $ (48,873) $ 309,516 $ 296 $ 471,190
Treasury Stock                  
Purchases of outstanding shares     $ (14,351) $ (441) $ (1,253)