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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Preferred Stock [Member]
Balance, value at Dec. 31, 2014 $ 1,228,175 $ 985,839 $ 234,498 $ 5,621 $ 2,217
Balance, shares at Dec. 31, 2014   57,437,000     8,782
Net income 24,361   24,361    
Other comprehensive income 8,665     8,665  
Issuance of common stock - stock option and other plans, value   $ 428      
Issuance of common stock - stock option and other plans, shares   17,000      
Issuance of common stock - restricted stock awards, net of cancelled awards, value   $ 862      
Issuance of common stock - restricted stock awards, net of cancelled awards, shares   273,000      
Stock Repurchased and Retired During Period, Value   $ (781)      
Stock Repurchased During Period, Shares   (28,000)      
Dividends, Preferred Stock, Cash     (31)    
Cash dividends paid on common stock (17,236)   (17,236)    
Balance, value at Mar. 31, 2015 1,244,443 $ 986,348 241,592 14,286 $ 2,217
Balance, shares at Mar. 31, 2015   57,699,000     8,782
Stock Issued During Period, Shares, New Issues         0
Stock Issued During Period, Value, New Issues         $ 0
Balance, value at Dec. 31, 2015 1,242,128 $ 990,281 255,925 (6,295) $ 2,217
Balance, shares at Dec. 31, 2015   57,724,000     8,782
Net income 21,259   21,259    
Other comprehensive income 18,638     18,638  
Issuance of common stock - stock option and other plans, value 598 $ 598      
Issuance of common stock - stock option and other plans, shares   20,000      
Issuance of common stock - restricted stock awards, net of cancelled awards, value 1,180 $ 1,180      
Issuance of common stock - restricted stock awards, net of cancelled awards, shares   299,000      
Stock Repurchased and Retired During Period, Value (1,033) $ (1,033)      
Stock Repurchased During Period, Shares   (35,000)      
Dividends, Preferred Stock, Cash (39)   39    
Cash dividends paid on common stock (21,943)   (21,943)    
Balance, value at Mar. 31, 2016 $ 1,260,788 $ 991,026 $ 255,202 $ 12,343 $ 2,217
Balance, shares at Mar. 31, 2016   58,008,000     8,782