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Income Taxes - Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Statutory federal income tax rate 21.00% 35.00% 35.00%
State income taxes, net of federal benefit 2.40% 0.70% 1.90%
Tax exempt income (1.50%) (2.60%) (2.70%)
Excess benefits from equity-based compensation (0.60%) (1.60%) (1.40%)
Bank-owned life insurance income (0.40%) (0.80%) (0.80%)
Federal tax credit (0.60%) (2.00%) (0.40%)
Enactment of Federal tax reform 0.00% 15.70% 0.00%
All other 0.60% 0.40% (0.30%)
Total 20.90% 44.80% 31.30%