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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current [Abstract]      
Federal $ 32,871 $ 26,059 $ 23,536
State 4,329 2,823 2,316
Current tax expense 37,200 28,882 25,852
Deferred [Abstract]      
Federal 2,521 6,648 2,334
State 482 1,699 10
Deferred tax expense 3,003 8,347 2,344
Total income tax expense 40,203 37,229 28,196
Income tax recorded to stockholders' equity 3,400 (1,100) 7,000
Deferred tax assets [Abstract]      
Allowance for loan losses 24,090 25,689  
Deferred compensation 10,023 8,744  
Postretirement benefit obligation 2,988 2,377  
Fair value adjustments from acquisitions 2,543 0  
Unrealized losses on securities 589 0  
Accrued liabilities 2,889 1,778  
Stock-based compensation expense 5,394 6,457  
Equipment leasing 476 1,416  
Other 1,477 1,325  
Total deferred tax assets 50,469 47,786  
Deferred tax liabilities [Abstract]      
Pension benefits 11,908 12,192  
Fair value adjustments from acquisitions 0 1,243  
Unrealized gains on securities 0 1,331  
Premises and equipment, primarily due to accelerated depreciation 2,444 2,491  
Deferred loan costs 1,591 1,460  
Intangible amortization 19,082 14,162  
Other 504 390  
Total deferred tax liabilities 35,529 33,269  
Net deferred tax asset at year-end 14,940 14,517 21,789
Net deferred tax asset (liability) at beginning of year 14,517 21,789  
Increase (Decrease) in net deferred tax asset $ 423 (7,272)  
Federal statutory income tax rate 35.00%    
Income tax reconciliation [Abstract]      
Federal income tax at statutory rate $ 40,820 39,306 31,482
Tax exempt income (2,037) (2,250) (2,433)
Net increase in CSV of life insurance (1,373) (1,734) (1,166)
Low income housing tax credits (939) (880) (819)
State taxes, net of federal tax benefit 3,127 2,939 1,512
Other, net 605 (152) (380)
Total income tax expense $ 40,203 $ 37,229 $ 28,196