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Income Taxes - Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Statutory federal income tax rate 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 0.70% 1.90% 2.40%
Tax exempt income (2.60%) (2.70%) (2.50%)
Excess benefits from equity-based compensation (1.60%) (1.40%) 0.00%
Bank-owned life insurance income (0.80%) (0.80%) (0.80%)
Federal tax credit (2.00%) (0.40%) (0.80%)
Enactment of Federal tax reform 15.70% 0.00% 0.00%
All other 0.40% (0.30%) (0.20%)
Total 44.80% 31.30% 33.10%