Loan Sales and Servicing - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]
Custodial escrow balances	$ 2,470	$ 2,360
Mortgages
Servicing Assets at Fair Value [Line Items]
Fair value of capitalized mortgage servicing rights	$ 2,100	$ 2,200
Mortgages | Minimum
Servicing Assets at Fair Value [Line Items]
Discount rates	10.50%	10.50%
Prepayment speeds	12.17%	14.80%
Mortgages | Maximum
Servicing Assets at Fair Value [Line Items]
Discount rates	16.50%	16.50%
Prepayment speeds	14.25%	15.72%