Other Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Expenses
Debit card expenses	$ 8,479	$ 6,153	$ 5,802
Consulting and outside services	6,080	5,525	4,179
VIE write-downs and other expenses	3,867	3,353	2,911
Loan expenses	3,611	2,824	2,513
Employee expenses	3,611	2,508	2,156
Checking and operating expenses	2,942	3,554	3,517
Printing and supplies	2,807	3,530	3,547
Postage	2,789	3,716	3,391
VIE write-downs and other expenses	2,702	4,528	4,231
Business development	1,847	1,526	1,401
Accounting and audit fees	1,674	1,401	1,393
Legal fees	1,391	1,082	1,455
ATM expenses	900	1,082	1,268
Other	4,460	3,983	3,884
Total other expenses	$ 47,160	$ 44,765	$ 41,648