LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - PORTFOLIO CLASS (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	$ 4,106		$ 4,616
Collectively evaluated for impairment	35,607		27,995
PCI loans with post acquisition impairment	478		309
Total ending allowance for loan losses	40,191	$ 37,898	32,920	$ 30,436	$ 29,308	$ 27,491
Impaired loans individually evaluated, excluding PCI loans	45,545		48,856
Loans collectively evaluated for impairment	3,904,615		3,751,648
PCI loans with post acquisition impairment	2,174		3,828
PCI loans without post acquisition impairment	5,178		6,446
Carrying value of loans	3,957,512		3,810,778
Core Banking Activities
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	4,106		4,616
Collectively evaluated for impairment	24,962		23,003
PCI loans with post acquisition impairment	478		309
Total ending allowance for loan losses	29,546	29,251	27,928	27,091	26,857	25,792
Impaired loans individually evaluated, excluding PCI loans	45,545		48,856
Loans collectively evaluated for impairment	3,857,484		3,712,701
PCI loans with post acquisition impairment	2,174		3,828
PCI loans without post acquisition impairment	5,178		6,446
Carrying value of loans	3,910,381		3,771,831
Traditional Banking
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	4,106		4,616
Collectively evaluated for impairment	23,534		21,539
PCI loans with post acquisition impairment	478		309
Total ending allowance for loan losses	28,118	27,749	26,464	25,438	25,392	24,825
Impaired loans individually evaluated, excluding PCI loans	45,545		48,856
Loans collectively evaluated for impairment	3,286,324		3,127,262
PCI loans with post acquisition impairment	2,174		3,828
PCI loans without post acquisition impairment	5,178		6,446
Carrying value of loans	3,339,221		3,186,392
Traditional Banking | Residential Real Estate - Owner Occupied
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	2,721		3,203
Collectively evaluated for impairment	3,519		3,797
PCI loans with post acquisition impairment	333		158
Total ending allowance for loan losses	6,573	6,740	7,158	7,417	7,893	8,301
Impaired loans individually evaluated, excluding PCI loans	29,581		31,908
Loans collectively evaluated for impairment	902,290		965,755
PCI loans with post acquisition impairment	1,673		2,297
PCI loans without post acquisition impairment	182		188
Carrying value of loans	933,726		1,000,148
Traditional Banking | Residential Real Estate - Owner Occupied - Correspondent
Allowance for loans losses
Collectively evaluated for impairment	314		373
Total ending allowance for loan losses	314	324	373	392	592	623
Loans collectively evaluated for impairment	125,643		149,028
Carrying value of loans	125,643		149,028
Traditional Banking | Residential Real Estate - Non Owner Occupied
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	7		65
Collectively evaluated for impairment	1,323		1,067
PCI loans with post acquisition impairment	7		7
Total ending allowance for loan losses	1,337	1,237	1,139	1,165	1,052	1,052
Impaired loans individually evaluated, excluding PCI loans	1,526		1,601
Loans collectively evaluated for impairment	191,343		154,481
PCI loans with post acquisition impairment	259		268
PCI loans without post acquisition impairment	251		255
Carrying value of loans	193,379		156,605
Traditional Banking | Commercial Real Estate
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	438		532
Collectively evaluated for impairment	8,295		7,501
PCI loans with post acquisition impairment	37		45
Total ending allowance for loan losses	8,770	8,368	8,078	8,031	7,805	7,672
Impaired loans individually evaluated, excluding PCI loans	10,898		11,769
Loans collectively evaluated for impairment	1,145,554		1,041,678
PCI loans with post acquisition impairment	142		1,164
PCI loans without post acquisition impairment	4,631		5,885
Carrying value of loans	1,161,225		1,060,496
Traditional Banking | Construction & land development
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	112		120
Collectively evaluated for impairment	1,964		1,730
Total ending allowance for loan losses	2,076	2,508	1,850	1,408	1,332	1,303
Impaired loans individually evaluated, excluding PCI loans	742		882
Loans collectively evaluated for impairment	138,095		118,768
Carrying value of loans	138,837		119,650
Traditional Banking | Commercial & Industrial
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	90		227
Collectively evaluated for impairment	1,840		1,284
Total ending allowance for loan losses	1,930	1,682	1,511	1,380	1,441	1,455
Impaired loans individually evaluated, excluding PCI loans	356		686
Loans collectively evaluated for impairment	326,835		258,317
PCI loans without post acquisition impairment	23		23
Carrying value of loans	327,214		259,026
Traditional Banking | Lease Financing Receivables
Allowance for loans losses
Collectively evaluated for impairment	162		136
Total ending allowance for loan losses	162	151	136	128	115	89
Loans collectively evaluated for impairment	15,367		13,614
Carrying value of loans	15,367		13,614
Traditional Banking | Home equity lines of credit
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	539		433
Collectively evaluated for impairment	3,211		3,225
PCI loans with post acquisition impairment	98		99
Total ending allowance for loan losses	3,848	3,787	3,757	3,535	3,016	2,996
Impaired loans individually evaluated, excluding PCI loans	1,743		1,929
Loans collectively evaluated for impairment	344,223		339,163
PCI loans with post acquisition impairment	97		99
PCI loans without post acquisition impairment	91		94
Carrying value of loans	346,154		341,285
Traditional Banking | Consumer: Credit cards
Allowance for loans losses
Collectively evaluated for impairment	606		490
Total ending allowance for loan losses	606	588	490	487	456	448
Loans collectively evaluated for impairment	19,898		13,414
Carrying value of loans	19,898		13,414
Traditional Banking | Consumer: Overdrafts
Allowance for loans losses
Collectively evaluated for impairment	892		675
Total ending allowance for loan losses	892	806	675	606	824	351
Loans collectively evaluated for impairment	892		803
Carrying value of loans	892		803
Traditional Banking | Consumer: Automobile loan
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	30
Collectively evaluated for impairment	639		526
Total ending allowance for loan losses	669	640	526	447	281	56
Impaired loans individually evaluated, excluding PCI loans	97
Loans collectively evaluated for impairment	63,542		52,579
Carrying value of loans	63,639		52,579
Traditional Banking | Other consumer
Allowance for loans losses
Individually evaluated for impairment, excluding PCI loans	169		36
Collectively evaluated for impairment	769		735
PCI loans with post acquisition impairment	3
Total ending allowance for loan losses	941	918	771	442	585	479
Impaired loans individually evaluated, excluding PCI loans	602		81
Loans collectively evaluated for impairment	12,642		19,662
PCI loans with post acquisition impairment	3
PCI loans without post acquisition impairment			1
Carrying value of loans	13,247		19,744
Warehouse Lending | Warehouse lines of credit
Allowance for loans losses
Collectively evaluated for impairment	1,428		1,464
Total ending allowance for loan losses	1,428	1,502	1,464	1,653	1,465	967
Loans collectively evaluated for impairment	571,160		585,439
Carrying value of loans	571,160		585,439
Republic Processing Group
Allowance for loans losses
Collectively evaluated for impairment	10,645		4,992
Total ending allowance for loan losses	10,645	8,647	4,992	3,345	2,451	1,699
Loans collectively evaluated for impairment	47,131		38,947
Carrying value of loans	47,131		38,947
Republic Processing Group | Commercial & Industrial
Allowance for loans losses
Collectively evaluated for impairment			25
Total ending allowance for loan losses			25
Loans collectively evaluated for impairment	265		6,695
Carrying value of loans	265		6,695
Republic Processing Group | Republic Credit Solutions
Allowance for loans losses
Collectively evaluated for impairment	10,645		4,967
Total ending allowance for loan losses	10,645	$ 8,647	4,967	$ 3,345	$ 2,451	$ 1,699
Loans collectively evaluated for impairment	46,866		32,252
Carrying value of loans	$ 46,866		$ 32,252