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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Treasury Stock [Member]
Unallocated ESOP Shares [Member]
Common Stock Acquired By DDFP [Member]
Deferred Compensation DDFP [Member]
Balance at the beginning of the period at Dec. 31, 2014 $ 1,144,099 $ 832 $ 995,053 $ 465,276 $ 29 $ (271,779) $ (45,312) $ (7,113) $ 7,113
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 83,722     83,722          
Other comprehensive loss, net of tax (2,575)       (2,575)        
Cash dividends paid (41,285)     (41,285)          
Distributions from DDFP 85   85         596 (596)
Purchase of employee restricted shares to fund statutory tax withholding (1,988)         (1,988)      
Shares issued dividend reinvestment plan 1,447   143     1,304      
Option exercises 3,166   (283)     3,449      
Allocation of ESOP shares 4,049   467       3,582    
Allocation of SAP shares 5,073   5,073            
Allocation of stock options 272   272            
Balance at the end of the period 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 87,802     87,802          
Other comprehensive loss, net of tax (851)       (851)        
Reclassification due to the adoption of ASU No. 2018-02         0        
Cash dividends paid (45,369)     (45,369)          
Effect of adopting Accounting Standards Update (ASU) No. 2016-09 0   (622) 622          
Distributions from DDFP 131   131         671 (671)
Purchases of treasury stock (1,557)         (1,557)      
Purchase of employee restricted shares to fund statutory tax withholding (1,225)         (1,225)      
Shares issued dividend reinvestment plan 1,652   356     1,296      
Option exercises 6,198   (81)     6,279      
Allocation of ESOP shares 4,951   1,199       3,752    
Allocation of SAP shares 3,812   3,812            
Allocation of stock options 172   172            
Balance at the end of the period 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 93,949     93,949          
Other comprehensive loss, net of tax (2,673)       (2,673)        
Reclassification due to the adoption of ASU No. 2018-02 0     1,395 (1,395)        
Cash dividends paid (59,980)     (59,980)          
Distributions from DDFP 232   232         671 (671)
Purchases of treasury stock (443)         (443)      
Purchase of employee restricted shares to fund statutory tax withholding (778)         (778)      
Shares issued dividend reinvestment plan 2,114   712     1,402      
Option exercises 2,954   (1,179)     4,133      
Allocation of ESOP shares 6,339   2,200       4,139    
Allocation of SAP shares 4,963   4,963            
Allocation of stock options 203   203            
Balance at the end of the period at Dec. 31, 2017 $ 1,298,661 $ 832 $ 1,012,908 $ 586,132 $ (7,465) $ (259,907) $ (33,839) $ (5,175) $ 5,175