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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Unallocated ESOP Shares [Member]
Common Stock Acquired By Directors Deferred Fee Plan [Member]
Deferred Compensation DDFP [Member]
Beginning balance at Dec. 31, 2015 $ 1,196,065 $ 832 $ 1,000,810 $ 507,713 $ (2,546) $ (269,014) $ (41,730) $ (6,517) $ 6,517
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 65,235     65,235          
Other comprehensive income, net of tax 8,520       8,520        
Cash dividends declared (35,141)     (35,141)          
Effect of adopting Accounting Standards Update (ASU) No. 2016-09 0   (622) 622          
Distributions from DDFP 91   91         503 (503)
Purchases of treasury stock (1,557)         (1,557)      
Purchase of employee restricted shares to fund statutory tax withholding (1,161)         (1,161)      
Shares issued dividend reinvestment plan 1,176   180     996      
Stock option exercises 5,598   (60)     5,658      
Allocation of ESOP shares 2,341   325       2,016    
Allocation of SAP shares 2,982   2,982            
Allocation of stock options 131   131            
Ending Balance at Sep. 30, 2016 1,244,280 832 1,003,837 538,429 5,974 (265,078) (39,714) (6,014) 6,014
Beginning balance at Jun. 30, 2016         7,118        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 22,906                
Other comprehensive income, net of tax (1,144)       (1,144)        
Ending Balance at Sep. 30, 2016 1,244,280 832 1,003,837 538,429 5,974 (265,078) (39,714) (6,014) 6,014
Beginning balance at Dec. 31, 2016 1,251,781 832 1,005,777 550,768 (3,397) (264,221) (37,978) (5,846) 5,846
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 74,466     74,466          
Other comprehensive income, net of tax 2,689       2,689        
Cash dividends declared (38,659)     (38,659)          
Distributions from DDFP 172   172         503 (503)
Purchases of treasury stock (443)         (443)      
Purchase of employee restricted shares to fund statutory tax withholding (726)         (726)      
Shares issued dividend reinvestment plan 1,339   417     922      
Stock option exercises 2,534   (1,024)     3,558      
Allocation of ESOP shares 3,167   1,053       2,114    
Allocation of SAP shares 3,702   3,702            
Allocation of stock options 150   150            
Ending Balance at Sep. 30, 2017 1,300,172 832 1,010,247 586,575 (708) (260,910) (35,864) (5,343) 5,343
Beginning balance at Jun. 30, 2017         (1,277)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 26,575                
Other comprehensive income, net of tax 569       569        
Ending Balance at Sep. 30, 2017 $ 1,300,172 $ 832 $ 1,010,247 $ 586,575 $ (708) $ (260,910) $ (35,864) $ (5,343) $ 5,343