LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - RISK CATEGORY (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Risk category of rated loans
Maximum number of days past due for loans to be non rated	90 days
Loans	$ 4,433,151	$ 4,148,227
Consumer loans receivable held for investment	998	1,922
Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	949,568	1,001,832
Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	258,803	242,846
Home equity lines of credit
Risk category of rated loans
Loans	293,186	332,548
Consumer: Credit cards
Risk category of rated loans
Loans	17,836	19,095
Consumer: Overdrafts
Risk category of rated loans
Loans	1,522	1,102
Consumer: Automobile loan
Risk category of rated loans
Loans	52,923	63,475
Other consumer
Risk category of rated loans
Loans	68,115	46,642
Republic Credit Solutions
Risk category of rated loans
Loans	105,397	88,744
Pass
Risk category of rated loans
Loans	2,648,380	2,327,312
Special Mention
Risk category of rated loans
Minimum outstanding lending relationships, above which loans are analyzed by the Bank's internal loan review department	1,000
Loans	21,754	21,205
Substandard
Risk category of rated loans
Minimum outstanding lending relationships, above which loans are analyzed by the Bank's internal loan review department	1,000
Loans	33,297	19,860
Doubtful / Loss
Risk category of rated loans
Minimum outstanding lending relationships, above which loans are analyzed by the Bank's internal loan review department	1,000
PCI Loans - Group 1
Risk category of rated loans
Loans	797	1,121
PCI Loans - Substandard
Risk category of rated loans
Loans	1,289	1,559
Rated Loans
Risk category of rated loans
Loans	2,705,517	2,371,057
Core Banking Activities
Risk category of rated loans
Loans	4,313,389	4,045,739
Core Banking Activities | Pass
Risk category of rated loans
Loans	2,648,380	2,327,312
Core Banking Activities | Special Mention
Risk category of rated loans
Loans	21,754	21,205
Core Banking Activities | Substandard
Risk category of rated loans
Loans	32,889	19,722
Core Banking Activities | PCI Loans - Group 1
Risk category of rated loans
Loans	797	1,121
Core Banking Activities | PCI Loans - Substandard
Risk category of rated loans
Loans	1,289	1,559
Core Banking Activities | Rated Loans
Risk category of rated loans
Loans	2,705,109	2,370,919
Traditional Banking
Risk category of rated loans
Loans	3,595,931	3,577,044
Traditional Banking | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	949,568	1,001,832
Traditional Banking | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	258,803	242,846
Traditional Banking | Commercial Real Estate
Risk category of rated loans
Loans	1,303,000	1,248,940
Traditional Banking | Construction & land development
Risk category of rated loans
Loans	159,702	175,178
Traditional Banking | Commercial & industrial
Risk category of rated loans
Loans	477,236	430,355
Traditional Banking | Lease Financing Receivables
Risk category of rated loans
Loans	14,040	15,031
Traditional Banking | Home equity lines of credit
Risk category of rated loans
Loans	293,186	332,548
Traditional Banking | Consumer: Credit cards
Risk category of rated loans
Loans	17,836	19,095
Traditional Banking | Consumer: Overdrafts
Risk category of rated loans
Loans	1,522	1,102
Traditional Banking | Consumer: Automobile loan
Risk category of rated loans
Loans	52,923	63,475
Traditional Banking | Other consumer
Risk category of rated loans
Loans	68,115	46,642
Traditional Banking | Pass
Risk category of rated loans
Loans	1,930,922	1,858,617
Traditional Banking | Pass | Commercial Real Estate
Risk category of rated loans
Loans	1,286,623	1,239,576
Traditional Banking | Pass | Construction & land development
Risk category of rated loans
Loans	157,165	175,113
Traditional Banking | Pass | Commercial & industrial
Risk category of rated loans
Loans	473,094	428,897
Traditional Banking | Pass | Lease Financing Receivables
Risk category of rated loans
Loans	14,040	15,031
Traditional Banking | Special Mention
Risk category of rated loans
Loans	21,754	21,205
Traditional Banking | Special Mention | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	12,153	14,536
Traditional Banking | Special Mention | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	487	575
Traditional Banking | Special Mention | Commercial Real Estate
Risk category of rated loans
Loans	4,623	5,281
Traditional Banking | Special Mention | Construction & land development
Risk category of rated loans
Loans	2,339
Traditional Banking | Special Mention | Commercial & industrial
Risk category of rated loans
Loans	2,152	813
Traditional Banking | Substandard
Risk category of rated loans
Loans	32,889	19,722
Traditional Banking | Substandard | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	14,441	12,072
Traditional Banking | Substandard | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	1,285	1,889
Traditional Banking | Substandard | Commercial Real Estate
Risk category of rated loans
Loans	11,123	3,162
Traditional Banking | Substandard | Construction & land development
Risk category of rated loans
Loans	198	65
Traditional Banking | Substandard | Commercial & industrial
Risk category of rated loans
Loans	1,968	620
Traditional Banking | Substandard | Home equity lines of credit
Risk category of rated loans
Loans	3,276	1,361
Traditional Banking | Substandard | Consumer: Automobile loan
Risk category of rated loans
Loans	247	91
Traditional Banking | Substandard | Other consumer
Risk category of rated loans
Loans	351	462
Traditional Banking | PCI Loans - Group 1
Risk category of rated loans
Loans	797	1,121
Traditional Banking | PCI Loans - Group 1 | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	140	170
Traditional Banking | PCI Loans - Group 1 | Commercial Real Estate
Risk category of rated loans
Loans	631	921
Traditional Banking | PCI Loans - Group 1 | Commercial & industrial
Risk category of rated loans
Loans	22	25
Traditional Banking | PCI Loans - Group 1 | Home equity lines of credit
Risk category of rated loans
Loans	4	5
Traditional Banking | PCI Loans - Substandard
Risk category of rated loans
Loans	1,289	1,559
Traditional Banking | PCI Loans - Substandard | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	1,281	1,476
Traditional Banking | PCI Loans - Substandard | Home equity lines of credit
Risk category of rated loans
Loans	6	81
Traditional Banking | PCI Loans - Substandard | Other consumer
Risk category of rated loans
Loans	2	2
Traditional Banking | Subprime
Risk category of rated loans
Loans	52,000	49,000
Loans originated for Community Reinvestment Act ("CRA") purposes	23,000	18,000
Traditional Banking | Rated Loans
Risk category of rated loans
Loans	1,987,651	1,902,224
Traditional Banking | Rated Loans | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	28,015	28,254
Traditional Banking | Rated Loans | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	1,772	2,464
Traditional Banking | Rated Loans | Commercial Real Estate
Risk category of rated loans
Loans	1,303,000	1,248,940
Traditional Banking | Rated Loans | Construction & land development
Risk category of rated loans
Loans	159,702	175,178
Traditional Banking | Rated Loans | Commercial & industrial
Risk category of rated loans
Loans	477,236	430,355
Traditional Banking | Rated Loans | Lease Financing Receivables
Risk category of rated loans
Loans	14,040	15,031
Traditional Banking | Rated Loans | Home equity lines of credit
Risk category of rated loans
Loans	3,286	1,447
Traditional Banking | Rated Loans | Consumer: Automobile loan
Risk category of rated loans
Loans	247	91
Traditional Banking | Rated Loans | Other consumer
Risk category of rated loans
Loans	353	464
Warehouse Lending | Warehouse lines of credit
Risk category of rated loans
Loans	717,458	468,695
Warehouse Lending | Pass | Warehouse lines of credit
Risk category of rated loans
Loans	717,458	468,695
Warehouse Lending | Rated Loans | Warehouse lines of credit
Risk category of rated loans
Loans	717,458	468,695
Republic Processing Group
Risk category of rated loans
Loans	119,762	102,488
Republic Processing Group | Other TRS loans
Risk category of rated loans
Loans	14,365	13,744
Republic Processing Group | Republic Credit Solutions
Risk category of rated loans
Loans	105,397	88,744
Republic Processing Group | Substandard
Risk category of rated loans
Loans	408	138
Republic Processing Group | Substandard | Other TRS loans
Risk category of rated loans
Loans	53
Republic Processing Group | Substandard | Republic Credit Solutions
Risk category of rated loans
Loans	355	138
Republic Processing Group | Rated Loans
Risk category of rated loans
Loans	408	138
Republic Processing Group | Rated Loans | Other TRS loans
Risk category of rated loans
Loans	53
Republic Processing Group | Rated Loans | Republic Credit Solutions
Risk category of rated loans
Loans	$ 355	138
Republic Credit Solutions
Risk category of rated loans
Percentage of loan receivable held for sale (as a percent)	90.00%
Consumer loans held for sale period	3 days
Interest retained (as a percent)	10.00%
Line of credit and credit card | Republic Credit Solutions
Risk category of rated loans
Percentage of loan receivable held for sale (as a percent)	90.00%
Consumer loans held for sale period	3 days
Interest retained (as a percent)	10.00%
Consumer loans receivable held for investment	$ 28,000	$ 32,000