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Income Taxes - Reconciliation of effective tax rate (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of effective tax rate      
Statutory tax rate 35.00% 35.00% 35.00%
State taxes-net of federal tax effect 7.00% 7.00% 6.00%
CRA investment tax credit (1.00%) (2.00%) (2.00%)
Bank owned life insurance (0.25%) (0.28%) (0.38%)
Municipal bonds (0.15%) (0.06%) (0.06%)
Other 0.00% 0.00% 0.00%
Effective income tax rate, percent 41.00% 40.00% 39.00%