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Consolidated Statements of Changes in Stockholders’ Equity - USD ($)
$ in Thousands
Purchase of Common Shares Outstanding [Member]
Treasury Stock [Member]
Restricted Stock Awards Repurchased To Satisfy Tax Obligations [Member]
Treasury Stock [Member]
Shares Purchased to Fund Options Exercised [Member]
Treasury Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Dec. 31, 2012       $ 315 $ 198,314 $ (10,257) $ 241,856 $ 12,137  
Common Stock                  
Amortization of prior service credits, net of taxes of $20, $19 and $20 for the years ended December 31, 2015, 2014 and 2013, respectively               (26)  
Amortization of net actuarial losses, net of taxes of ($509), ($330) and ($541) for the years ended December 31, 2015, 2014 and 2013, respectively               696 $ (696)
Unrecognized actuarial gains (losses), net of taxes of ($465), $2,880 and ($2,527) for the years ended December 31, 2015, 2014 and 2013, respectively               3,261 3,261
Change in net unrealized (losses) gains on securities available for sale, net oftaxes of approximately $2,911, ($10,441) and $20,609 for the years ended December 31, 2015, 2014 and 2013, respectively               (26,541) (26,541)
Reclassification adjustment for net gains included in net income, net of taxes of approximately $72, $1,241 and $700 for the years ended December 31, 2015, 2014 and 2013, respectively               (902) 1,700
Net income             37,752   37,752
Award of common shares released from Employee Benefit Trust (147,616, 136,559 and 143,941 common shares for the years ended December 31, 2015, 2014 and 2013, respectively)         1,652        
Value of shares issued upon vesting of restricted stock unit awards         161 2,406 (119)    
Cash dividends declared and paid on common shares ($0.64, $0.60 and $0.52 per share for the years ended December 31, 2015, 2014 and 2013, respectively)             (15,618)    
Value of stock options exercised         1,451 6,763 (128)   6,814
Stock-based compensation activity, net         (119)        
Stock-based income tax benefit         443        
Balance at Dec. 31, 2013       315 201,902 (22,053) 263,743 (11,375) 432,532
Treasury Stock                  
Value of shares purchased for the Treasury $ (13,152) $ (999) $ (6,814)            
Amortization of prior service credits, net of taxes of $20, $19 and $20 for the years ended December 31, 2015, 2014 and 2013, respectively               (26)  
Amortization of net actuarial losses, net of taxes of ($509), ($330) and ($541) for the years ended December 31, 2015, 2014 and 2013, respectively               370 (370)
Unrecognized actuarial gains (losses), net of taxes of ($465), $2,880 and ($2,527) for the years ended December 31, 2015, 2014 and 2013, respectively               (3,790) (3,790)
Change in net unrealized (losses) gains on securities available for sale, net oftaxes of approximately $2,911, ($10,441) and $20,609 for the years ended December 31, 2015, 2014 and 2013, respectively               13,548 13,548
Reclassification adjustment for net gains included in net income, net of taxes of approximately $72, $1,241 and $700 for the years ended December 31, 2015, 2014 and 2013, respectively               (1,634) 1,634
Net income             44,239   44,239
Award of common shares released from Employee Benefit Trust (147,616, 136,559 and 143,941 common shares for the years ended December 31, 2015, 2014 and 2013, respectively)         2,075        
Value of shares issued upon vesting of restricted stock unit awards         30 3,205 (430)    
Cash dividends declared and paid on common shares ($0.64, $0.60 and $0.52 per share for the years ended December 31, 2015, 2014 and 2013, respectively)             (17,852)    
Value of stock options exercised         455 2,461 (77)   1,962
Stock-based compensation activity, net         1,129        
Stock-based income tax benefit         846        
Balance at Dec. 31, 2014       315 206,437 (37,221) 289,623 (2,907) 456,247
Treasury Stock                  
Value of shares purchased for the Treasury (17,644) (1,228) (1,962)            
Amortization of prior service credits, net of taxes of $20, $19 and $20 for the years ended December 31, 2015, 2014 and 2013, respectively               (26)  
Amortization of net actuarial losses, net of taxes of ($509), ($330) and ($541) for the years ended December 31, 2015, 2014 and 2013, respectively               669 (669)
Unrecognized actuarial gains (losses), net of taxes of ($465), $2,880 and ($2,527) for the years ended December 31, 2015, 2014 and 2013, respectively               615 615
Change in net unrealized (losses) gains on securities available for sale, net oftaxes of approximately $2,911, ($10,441) and $20,609 for the years ended December 31, 2015, 2014 and 2013, respectively               (3,818) (3,818)
Reclassification adjustment for net gains included in net income, net of taxes of approximately $72, $1,241 and $700 for the years ended December 31, 2015, 2014 and 2013, respectively               (95) 95
Net income             46,209   46,209
Award of common shares released from Employee Benefit Trust (147,616, 136,559 and 143,941 common shares for the years ended December 31, 2015, 2014 and 2013, respectively)         2,092        
Value of shares issued upon vesting of restricted stock unit awards         160 3,580 (504)    
Cash dividends declared and paid on common shares ($0.64, $0.60 and $0.52 per share for the years ended December 31, 2015, 2014 and 2013, respectively)             (18,616)    
Value of stock options exercised         54 825 (182)   447
Stock-based compensation activity, net         1,335        
Stock-based income tax benefit         574        
Balance at Dec. 31, 2015       $ 315 $ 210,652 $ (48,868) $ 316,530 $ (5,562) $ 473,067
Treasury Stock                  
Value of shares purchased for the Treasury $ (14,351) $ (1,254) $ (447)