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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock
Unallocated ESOP Shares
Common Stock Acquired By DDFP
Deferred Compensation DDFP
Balance at the beginning of the period at Dec. 31, 2017 $ 1,298,661 $ 0 $ 832 $ 1,012,908 $ 586,132 $ 184 $ (7,465) $ (184) $ (259,907) $ (33,839) $ (5,175) $ 5,175
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Net income 118,387       118,387              
Other comprehensive loss, net of tax (4,687)           (4,687)          
Cash dividends paid (53,604)       (53,604)              
Distributions from DDFP 156     156             671 (671)
Purchases of treasury stock (13,172)               (13,172)      
Purchase of employee restricted shares to fund statutory tax withholding (1,896)               (1,896)      
Shares issued dividend reinvestment plan 1,709     577         1,132      
Option exercises 1,007     (366)         1,373      
Allocation of ESOP shares 6,183     2,022           4,161    
Allocation of SAP shares 6,046     6,046                
Allocation of stock options 190     190                
Balance at the end of the period at Dec. 31, 2018 $ 1,358,980 4,350 832 1,021,533 651,099 4,350 (12,336) $ 0 (272,470) (29,678) (4,504) 4,504
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201802Member                      
Net income $ 112,633       112,633              
Other comprehensive loss, net of tax 16,157           16,157          
Cash dividends paid (72,809)       (72,809)              
Distributions from DDFP 164     164             671 (671)
Purchases of treasury stock (19,867)               (19,867)      
Purchase of employee restricted shares to fund statutory tax withholding (1,985)               (1,985)      
Shares issued dividend reinvestment plan 2,230     671         1,559      
Option exercises 139     (96)         235      
Allocation of ESOP shares 6,996     2,203           4,793    
Allocation of SAP shares 6,671     6,671                
Allocation of stock options 181     181                
Reclass of stock award shares 0     (24,024)         24,024      
Balance at the end of the period at Dec. 31, 2019 $ 1,413,840 $ (8,311) 832 1,007,303 695,273 $ (8,311) 3,821   (268,504) (24,885) (3,833) 3,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201601Member                      
Net income $ 96,951       96,951              
Other comprehensive loss, net of tax 13,834           13,834          
Cash dividends paid (65,823)       (65,823)              
Distributions from DDFP 84     84             620 (620)
Purchases of treasury stock (21,161)               (21,161)      
Purchase of employee restricted shares to fund statutory tax withholding (969)               (969)      
Shares issued dividend reinvestment plan 451     50         401      
Allocation of ESOP shares 4,554     (116)           4,670    
Allocation of SAP shares 5,330     5,330                
Allocation of stock options 189     189                
Acquisition of deferred compensation plan 0                   (1,336) 1,336
Balance at the end of the period at Dec. 31, 2020 $ 1,619,797   $ 832 $ 962,453 $ 718,090   $ 17,655   $ (59,018) $ (20,215) $ (4,549) $ 4,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member