Mortgage Banking (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Mortgage servicing assets:
Balance at beginning of period	$ 10,240	$ 10,117
Loans sold, servicing retained	324	356
Amortization	(319)	(312)
Carrying value before valuation allowance at end of period	10,245	10,161
Valuation allowance:
Balance at beginning of period	(432)	(522)
Impairment (expense) recovery	37	33
Balance at end of period	(395)	(489)
Net carrying value of MSRs at end of period	9,850	9,672
Fair value of MSRs at end of period	$ 10,280	$ 10,013