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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Taxes computed at statutory rate, amount $ (26,196) $ 82,475 $ 80,244  
State income taxes, net of federal income tax benefit, amount (1,269) 7,204 8,770  
Tax-exempt interest, amount (10,444) (10,435) (10,803)  
Life insurance contracts, amount (4,857) (3,901) (2,019)  
Tax credits, amount (8,072) (10,293) (11,344)  
Employee share-based compensation, amount 1,351 (842) (1,380)  
FDIC assessment disallowance, amount 2,094 1,895 2,818  
Return to provision adjustment, amount (970) (1,459) (9,942)  
Net operating loss carryback under CARES act, amount (30,167)      
Other, net, amount (1,041) 715 2,002  
Total included in net income $ (79,571) $ 65,359 $ 58,346  
Taxes computed at statutory rate 21.00% 21.00% 21.00% 35.00%
State income taxes, net of federal income tax benefit 1.00% 1.80% 2.30%  
Tax-exempt interest 8.40% (2.70%) (2.80%)  
Life insurance contracts 3.90% (1.00%) (0.50%)  
Tax credits 6.50% (2.60%) (3.00%)  
Employee share-based compensation (1.10%) (0.20%) (0.30%)  
FDIC assessment disallowance (1.70%) 0.50% 0.70%  
Return to provision adjustment 0.80% (0.40%) (2.60%)  
Net operating loss carryback under CARES act 24.20%      
Other, net 0.80% 0.20% 0.50%  
Income tax expense 63.80% 16.60% 15.30%