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Consolidated Statements 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 INCOME
TREASURYSTOCK
UNALLOCATED ESOP SHARES
COMMON STOCK ACQUIRED BY DEFERRED COMP PLANS
DEFERRED COMPENSATION PLANS
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Effect of Adopting Accounting Standards Updates $ 1,358,980 $ 4,350 $ 832 $ 1,021,533 $ 651,099 $ 4,350 $ (12,336) $ (272,470) $ (29,678) $ (4,504) $ 4,504
Beginning balance at Dec. 31, 2018 1,358,980 4,350 832 1,021,533 651,099 4,350 (12,336) (272,470) (29,678) (4,504) 4,504
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 86,682       86,682            
Other comprehensive income (loss), net of tax 19,098           19,098        
Cash dividends paid (59,591)       (59,591)            
Distributions from DDFP 123     123           503 (503)
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 1,764     545       1,219      
Stock option exercises 139     (96)       235      
Allocation of ESOP shares 3,121     1,007         2,114    
Allocation of SAP shares 4,884     4,884              
Allocation of stock options 135     135              
Effect of Adopting Accounting Standards Updates 1,358,980 4,350 832 1,021,533 651,099 4,350 6,762 (272,470) (27,564) (4,504) 4,504
Ending Balance at Sep. 30, 2019 1,397,833   832 1,028,131 682,540   6,762 (292,868) (27,564) (4,001) 4,001
Beginning balance at Dec. 31, 2018 1,358,980 4,350 832 1,021,533 651,099 4,350 (12,336) (272,470) (29,678) (4,504) 4,504
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Effect of Adopting Accounting Standards Updates 1,358,980 (8,311) 832 1,007,303 695,273 (8,311) 3,821 (268,504) (24,885) (3,833) 3,833
Ending Balance 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:AccountingStandardsUpdate201613Member                    
Effect of Adopting Accounting Standards Updates $ 1,391,446   832 1,025,855 666,415   3,976 (277,364) (28,268) (4,169) 4,169
Beginning balance at Jun. 30, 2019 1,391,446   832 1,025,855 666,415   3,976 (277,364) (28,268) (4,169) 4,169
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 31,399       31,399            
Other comprehensive income (loss), net of tax 2,786           2,786        
Cash dividends paid (15,274)       (15,274)            
Distributions from DDFP 38     38           168 (168)
Purchases of treasury stock (15,817)             (15,817)      
Purchase of employee restricted shares to fund statutory tax withholding (32)             (32)      
Shares issued dividend reinvestment plan 461     116       345      
Allocation of ESOP shares 1,002     298         704    
Allocation of SAP shares 1,778     1,778              
Allocation of stock options 46     46              
Effect of Adopting Accounting Standards Updates 1,397,833   832 1,028,131 682,540   6,762 (292,868) (27,564) (4,001) 4,001
Ending Balance at Sep. 30, 2019 1,397,833   832 1,028,131 682,540   6,762 (292,868) (27,564) (4,001) 4,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Effect of Adopting Accounting Standards Updates 1,397,833   832 1,028,131 682,540   6,762 (292,868) (27,564) (4,001) 4,001
Effect of Adopting Accounting Standards Updates 1,413,840 (8,311) 832 1,007,303 695,273 (8,311) 3,821 (268,504) (24,885) (3,833) 3,833
Beginning balance 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]                      
Net income 56,384       56,384            
Other comprehensive income (loss), net of tax 9,510           9,510        
Cash dividends paid (49,106)       (49,106)            
Acquisition of deferred compensation plan                   (1,336) 1,336
Distributions from DDFP 68     68           503 (503)
Purchases of treasury stock (7,256)             (7,256)      
Purchase of employee restricted shares to fund statutory tax withholding (974)             (974)      
Shares issued dividend reinvestment plan 451     50       401      
Allocation of ESOP shares 2,127     (179)         2,306    
Allocation of SAP shares 3,866     3,866              
Allocation of stock options 142     142              
Treasury shares issued due to acquisition 180,828     (50,387)       231,215      
Effect of Adopting Accounting Standards Updates 1,413,840 $ (8,311) 832 960,863 694,240 $ (8,311) 13,331 (268,504) (24,885) (3,833) 4,666
Ending Balance at Sep. 30, 2020 1,601,569   832 960,863 694,240   13,331 (45,118) (22,579) (4,666) 4,666
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Effect of Adopting Accounting Standards Updates 1,410,407   832 1,009,978 685,509   12,794 (275,359) (23,347) (3,498) 3,498
Beginning balance at Jun. 30, 2020 1,410,407   832 1,009,978 685,509   12,794 (275,359) (23,347) (3,498) 3,498
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 27,143       27,143            
Other comprehensive income (loss), net of tax 537           537        
Cash dividends paid (18,412)       (18,412)            
Acquisition of deferred compensation plan                   (1,336) 1,336
Distributions from DDFP 16     16           168 (168)
Purchases of treasury stock (961)             (961)      
Purchase of employee restricted shares to fund statutory tax withholding (13)             (13)      
Allocation of ESOP shares 605     (163)         768    
Allocation of SAP shares 1,371     1,371              
Allocation of stock options 48     48              
Treasury shares issued due to acquisition 180,828     (50,387)       231,215      
Effect of Adopting Accounting Standards Updates 1,410,407   832 960,863 694,240   13,331 (45,118) (22,579) (4,666) 4,666
Ending Balance at Sep. 30, 2020 $ 1,601,569   832 960,863 694,240   13,331 (45,118) (22,579) (4,666) 4,666
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Accounting standards update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member                    
Effect of Adopting Accounting Standards Updates $ 1,601,569   $ 832 $ 960,863 $ 694,240   $ 13,331 $ (45,118) $ (22,579) $ (4,666) $ 4,666