Quarterly Results of Operations (Unaudited) - Summary (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Quarterly Financial Data [Abstract]
Total revenue	$ 22,860	$ 22,044	$ 22,647	$ 22,915	$ 23,238	$ 22,757	$ 22,687	$ 22,025	$ 90,466	$ 90,707	$ 86,790
Interest expense	2,477	2,258	2,243	2,244	2,257	2,311	2,273	2,166	9,222	9,007	5,970
Provision for credit losses	13,211	8,796	8,144	7,026	7,513	7,599	6,177	4,989	37,177	26,278	20,371
Non-interest expense	8,883	8,403	9,102	8,939	9,040	8,422	8,940	8,915
Operating income before income taxes	(1,711)	2,587	3,158	4,706	4,428	4,425	5,297	5,955	8,740	20,105	26,096
Income tax expense	(641)	981	1,188	1,803	1,702	1,698	2,041	2,285	3,331	7,726	9,240
Net income	$ (1,070)	$ 1,606	$ 1,970	$ 2,903	$ 2,726	$ 2,727	$ 3,256	$ 3,670	$ 5,409	$ 12,379	$ 16,856
Earnings per share:
Basic earnings per share (in dollars per share)	$ (0.14)	$ 0.21	$ 0.25	$ 0.37	$ 0.35	$ 0.36	$ 0.43	$ 0.48	$ 0.70	$ 1.60	$ 1.40
Diluted earnings per share (in dollars per share)	$ (0.14)	$ 0.21	$ 0.25	$ 0.37	$ 0.35	$ 0.35	$ 0.42	$ 0.47	$ 0.69	$ 1.59	$ 1.38