Revenue from Contracts with Customers - Contract Assets, Contract Liabilities and Receivables from Contracts with Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Revenue from Contract with Customer [Abstract]
Contract assets	$ 0	$ 0	$ 0
Contract liabilities	1,522	1,706	1,891
Mortgage broker fees receivable	21	69	87
Administrative services receivable	102	0	98
Wealth management receivable	8,199	8,102	7,679
Card related fees receivable	0	202	0
Total receivables from contracts with customer	$ 8,322	$ 8,373	$ 7,864