Business Segment Information - Operating Statements (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Dec. 22, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Income
Interest income		$ 28,152	$ 27,955	$ 26,107	$ 24,697	$ 23,991	$ 23,874	$ 23,504	$ 23,062	$ 106,911	$ 94,431	$ 78,743
Total interest expense		1,708	1,634	1,174	871	867	826	760	758	5,387	3,211	2,422
Net interest income		26,444	26,321	24,933	23,826	23,124	23,048	22,744	22,304	101,524	91,220	76,321
Provision for loan losses		(291)	115	(46)	321	240	245	351	401	99	1,237	32
Net interest income after provision		26,735	26,206	24,979	23,505	22,884	22,803	22,393	21,903	101,425	89,983	76,289
Noninterest income		2,564	2,460	2,293	2,295	3,039	2,312	3,660	2,614	9,612	11,625	8,985
Noninterest expense		15,322	14,834	15,254	15,328	14,277	14,296	14,381	14,685	60,738	57,639	58,673
Income before income taxes		13,977	13,832	12,018	10,472	11,646	10,819	11,672	9,832	50,299	43,969	26,601
Income tax expense		12,719	5,249	4,569	3,934	4,431	4,054	4,377	3,726	26,471	16,588	10,104
Net income		1,258	$ 8,583	$ 7,449	$ 6,538	7,215	$ 6,765	$ 7,295	$ 6,106	23,828	27,381	16,497
Total assets		2,843,452				2,570,880				2,843,452	2,570,880	2,361,579
Loans, net of deferred fees		1,582,667				1,502,607				1,582,667	1,502,607	1,358,716
Goodwill		45,664				45,664				45,664	45,664	45,664
Pre-tax acquisition costs										671
Tax Cuts and Jobs Act of 2017 effect on re-measurement of net deferred tax assets	$ 7,103	7,103								7,103
Banking
Operating Income
Interest income										95,027	82,175	66,306
Intersegment interest allocations										1,126	1,163	1,087
Total interest expense										5,387	3,211	2,422
Net interest income										90,766	80,127	64,971
Provision for loan losses										102	1,181	(156)
Net interest income after provision										90,664	78,946	65,127
Noninterest income										8,559	10,821	8,234
Noninterest expense										53,860	50,298	51,438
Intersegment expense allocations										528	804	386
Income before income taxes										45,891	40,273	22,309
Income tax expense										24,266	15,036	8,301
Net income										21,625	25,237	14,008
Total assets		2,780,286				2,507,121				2,780,286	2,507,121	2,306,543
Loans, net of deferred fees		1,533,841				1,452,991				1,533,841	1,452,991	1,318,657
Goodwill		32,620				32,620				32,620	32,620	32,620
Pre-tax acquisition costs		671
Tax Cuts and Jobs Act of 2017 effect on re-measurement of net deferred tax assets										6,749
Factoring
Operating Income
Interest income										11,884	12,256	12,437
Intersegment interest allocations										(1,126)	(1,163)	(1,087)
Net interest income										10,758	11,093	11,350
Provision for loan losses										(3)	56	188
Net interest income after provision										10,761	11,037	11,162
Noninterest income										1,053	804	751
Noninterest expense										6,878	7,341	7,235
Intersegment expense allocations										(528)	(804)	(386)
Income before income taxes										4,408	3,696	4,292
Income tax expense										2,205	1,552	1,803
Net income										2,203	2,144	2,489
Total assets		63,166				63,759				63,166	63,759	55,036
Loans, net of deferred fees		48,826				49,616				48,826	49,616	40,059
Goodwill		13,044				13,044				13,044	13,044	13,044
Tax Cuts and Jobs Act of 2017 effect on re-measurement of net deferred tax assets										354
HCC (Parent)
Operating Income
Total interest expense										1,394	11	18
Income before income taxes										12,450	15,421	(2,723)
Income tax expense										(1,300)	(1,063)	(1,139)
Net income										23,828	27,381	16,497
Total assets		$ 310,626				$ 259,850				$ 310,626	$ 259,850
Focus Business Bank
Operating Income
Pre-tax acquisition costs												$ 6,398