Borrowings - Maturities and Weighted Average Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Scheduled maturities and weighted average rates of borrowings
Year one	$ 95,715	$ 49,070
Year two		45,500
Thereafter	101,589	57,543
Total	$ 197,304	$ 152,113
Weighted Average Rate
Year one (as a percent)	0.51%	0.06%
Year two (as a percent)		1.82%
Thereafter (as a percent)	6.65%	7.34%
Total (as a percent)	3.67%	3.34%