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Income Taxes Reconciliation of effective tax rate (Details)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
Statutory tax rate 35.00% 35.00%
State taxes-net of federal tax effect 7.18% 7.32%
Affordable housing partnership investment tax credit (2.93%) (1.29%)
Bank owned life insurance (0.16%) (0.24%)
Municipal securities (0.25%) (0.21%)
Nondeductible transaction costs 0.08% 0.48%
Other (0.08%) (0.37%)
Effective income tax rate 38.84% 40.69%