Parent Only Financial Statements - Income Statements (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest expense—borrowings													$ 1,395	$ 998	$ 340
Noninterest expense:
Compensation and benefits													40,456	33,550	28,760
Occupancy and depreciation													9,260	7,325	6,556
Professional services and marketing costs													5,490	5,995	4,003
Other expenses													6,252	5,637	4,303
Total noninterest expense	$ 17,170	$ 16,956	$ 13,974	$ 13,358	$ 12,995	$ 13,095	$ 13,871	$ 12,546	$ 11,263	$ 10,938	$ 11,025	$ 10,396	61,458	52,507	43,622
Taxes on income	3,297	2,041	2,175	1,941	2,145	2,130	1,094	1,058	(1,044)	890	1,135	649	9,454	6,427	1,630
Net income	$ 5,048	$ 2,762	$ 2,942	$ 2,626	$ 3,006	$ 2,659	$ 1,267	$ 1,462	$ 3,488	$ 1,453	$ 1,852	$ 1,058	13,378	8,394	7,851
FFI
Interest expense—borrowings													674	740	219
Noninterest income—earnings from investment in subsidiaries													15,801	11,050	9,883
Noninterest expense:
Compensation and benefits													1,152	1,096	613
Occupancy and depreciation													191	141	66
Professional services and marketing costs													1,669	2,469	1,120
Other expenses													702	852	526
Total noninterest expense													3,714	4,558	2,325
Income before taxes on income													11,413	5,752	7,339
Taxes on income													(1,965)	(2,642)	(512)
Net income													$ 13,378	$ 8,394	$ 7,851