Business Segment Information - Operating 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, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Income (Loss)
Interest income	$ 22,896	$ 20,306	$ 18,175	$ 17,366	$ 16,717	$ 14,492	$ 14,192	$ 13,855	$ 78,743	$ 59,256	$ 52,786
Total interest expense	758	623	533	508	625	500	507	521	2,422	2,153	2,600
Net interest income	22,138	19,683	17,642	16,858	16,092	13,992	13,685	13,334	76,321	57,103	50,186
Provision (credit) for loan losses	371	(301)	22	(60)	(106)	(24)	(198)	(10)	32	(338)	(816)
Net interest income after provision	21,767	19,984	17,620	16,918	16,198	14,016	13,883	13,344	76,289	57,441	51,002
Noninterest income	2,829	2,066	2,164	1,926	1,812	1,870	2,047	2,017	8,985	7,746	7,214
Noninterest expense	17,361	16,419	12,617	12,276	12,415	10,492	10,769	10,546	58,673	44,222	40,470
Income before income taxes	7,235	5,631	7,167	6,568	5,595	5,394	5,161	4,815	26,601	20,965	17,746
Income tax expense	2,812	2,172	2,690	2,430	1,993	1,969	1,837	1,739	10,104	7,538	6,206
Net income	4,423	$ 3,459	$ 4,477	$ 4,138	3,602	$ 3,425	$ 3,324	$ 3,076	16,497	13,427	$ 11,540
Total assets	2,361,579				1,617,103				2,361,579	1,617,103
Loans, net of deferred fees	1,358,716				1,088,643				1,358,716	1,088,643
Goodwill	45,664				13,044				45,664	13,044
Banking
Operating Income (Loss)
Interest income									66,306	57,178
Intersegment interest allocations									1,087	31
Total interest expense									2,422	2,033
Net interest income									64,971	55,176
Provision (credit) for loan losses									(156)	(338)
Net interest income after provision									65,127	55,514
Noninterest income									8,234	7,662
Noninterest expense									51,438	43,132
Intersegment expense allocation									386
Income before income taxes									22,309	20,044
Income tax expense									8,301	7,151
Net income									14,008	12,893
Total assets	2,306,543				1,561,911				2,306,543	1,561,911
Loans, net of deferred fees	1,318,657				1,048,631				1,318,657	1,048,631
Goodwill	32,620								32,620
Factoring
Operating Income (Loss)
Interest income									12,437	2,078
Intersegment interest allocations									(1,087)	(31)
Total interest expense										120
Net interest income									11,350	1,927
Provision (credit) for loan losses									188
Net interest income after provision									11,162	1,927
Noninterest income									751	84
Noninterest expense									7,235	1,090
Intersegment expense allocation									(386)
Income before income taxes									4,292	921
Income tax expense									1,803	387
Net income									2,489	534
Total assets	55,036				55,192				55,036	55,192
Loans, net of deferred fees	40,059				40,012				40,059	40,012
Goodwill	$ 13,044				$ 13,044				$ 13,044	$ 13,044