Borrowings - Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Long-term borrowings
2017	$ 10,000
2018	12,500
2019	82,029
2020	7,500
Thereafter	15,000
Long-term debt	127,029	$ 140,029
Fixed Rate
Long-term borrowings
2017	10,000
2018	7,500
2019	7,000
2020	7,500
Thereafter	15,000
Long-term debt	47,000
Floating Rate
Long-term borrowings
2018	5,000
2019	75,029
Long-term debt	$ 80,029