Commitments and Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Total unfunded commitments	$ 229,573	$ 240,427
Revolving home equity and credit card lines [Member]
Loss Contingencies [Line Items]
Total unfunded commitments	69,187	63,769
Construction loans [Member]
Loss Contingencies [Line Items]
Total unfunded commitments	44,323	41,472
Other loans [Member]
Loss Contingencies [Line Items]
Total unfunded commitments	112,193	131,291
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Total unfunded commitments	$ 3,870	$ 3,895