LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - RISK CATEGORY (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Risk category of rated loans
Loans	$ 3,710,376	$ 3,810,778
Pass
Risk category of rated loans
Loans	1,940,428	2,024,233
Special Mention
Risk category of rated loans
Loans	28,586	30,702
Loans modified by troubled debt restructurings during the period	2,000	2,000
Substandard
Risk category of rated loans
Loans	21,460	21,412
Loans modified by troubled debt restructurings during the period	1,000	1,000
Purchased Credit Impaired Loans - Group 1
Risk category of rated loans
Loans	7,815	7,908
Purchased Credit Impaired Loans - Substandard
Risk category of rated loans
Loans	1,896	2,366
Rated Loans
Risk category of rated loans
Loans	2,000,185	2,086,621
Core Banking Activities
Risk category of rated loans
Loans	3,667,669	3,771,831
Core Banking Activities | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	969,705	1,000,148
Core Banking Activities | Residential Real Estate - Owner Occupied - Correspondent
Risk category of rated loans
Loans	141,375	149,028
Core Banking Activities | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	164,742	156,605
Core Banking Activities | Commercial Real Estate
Risk category of rated loans
Loans	1,049,193	1,060,496
Core Banking Activities | Construction & land development
Risk category of rated loans
Loans	130,766	119,650
Core Banking Activities | Commercial & Industrial
Risk category of rated loans
Loans	270,652	259,026
Core Banking Activities | Lease Financing Receivables
Risk category of rated loans
Loans	13,853	13,614
Core Banking Activities | Warehouse lines of credit
Risk category of rated loans
Loans	495,165	585,439
Core Banking Activities | Home equity lines of credit
Risk category of rated loans
Loans	341,611	341,285
Core Banking Activities | Consumer: Credit cards
Risk category of rated loans
Loans	14,644	13,414
Core Banking Activities | Consumer: Overdrafts
Risk category of rated loans
Loans	786	803
Core Banking Activities | Consumer: Automobile loan
Risk category of rated loans
Loans	55,962	52,579
Core Banking Activities | Other consumer
Risk category of rated loans
Loans	19,215	19,744
Core Banking Activities | Pass
Risk category of rated loans
Loans	1,940,414	2,017,538
Core Banking Activities | Pass | Commercial Real Estate
Risk category of rated loans
Loans	1,031,746	1,042,137
Core Banking Activities | Pass | Construction & land development
Risk category of rated loans
Loans	129,894	118,769
Core Banking Activities | Pass | Commercial & Industrial
Risk category of rated loans
Loans	269,756	257,579
Core Banking Activities | Pass | Lease Financing Receivables
Risk category of rated loans
Loans	13,853	13,614
Core Banking Activities | Pass | Warehouse lines of credit
Risk category of rated loans
Loans	495,165	585,439
Core Banking Activities | Special Mention
Risk category of rated loans
Loans	28,586	30,702
Core Banking Activities | Special Mention | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	20,549	21,344
Core Banking Activities | Special Mention | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	649	656
Core Banking Activities | Special Mention | Commercial Real Estate
Risk category of rated loans
Loans	6,345	7,086
Core Banking Activities | Special Mention | Construction & land development
Risk category of rated loans
Loans	89	90
Core Banking Activities | Special Mention | Commercial & Industrial
Risk category of rated loans
Loans	722	1,270
Core Banking Activities | Special Mention | Home equity lines of credit
Risk category of rated loans
Loans	232	256
Core Banking Activities | Substandard
Risk category of rated loans
Loans	21,338	21,330
Core Banking Activities | Substandard | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	12,972	13,117
Core Banking Activities | Substandard | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	1,079	1,115
Core Banking Activities | Substandard | Commercial Real Estate
Risk category of rated loans
Loans	4,107	4,224
Core Banking Activities | Substandard | Construction & land development
Risk category of rated loans
Loans	783	791
Core Banking Activities | Substandard | Commercial & Industrial
Risk category of rated loans
Loans	151	154
Core Banking Activities | Substandard | Home equity lines of credit
Risk category of rated loans
Loans	2,035	1,763
Core Banking Activities | Substandard | Other consumer
Risk category of rated loans
Loans	211	166
Core Banking Activities | Purchased Credit Impaired Loans - Group 1
Risk category of rated loans
Loans	7,815	7,908
Core Banking Activities | Purchased Credit Impaired Loans - Group 1 | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	186	218
Core Banking Activities | Purchased Credit Impaired Loans - Group 1 | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	518	523
Core Banking Activities | Purchased Credit Impaired Loans - Group 1 | Commercial Real Estate
Risk category of rated loans
Loans	6,995	7,049
Core Banking Activities | Purchased Credit Impaired Loans - Group 1 | Commercial & Industrial
Risk category of rated loans
Loans	23	23
Core Banking Activities | Purchased Credit Impaired Loans - Group 1 | Home equity lines of credit
Risk category of rated loans
Loans	92	94
Core Banking Activities | Purchased Credit Impaired Loans - Group 1 | Other consumer
Risk category of rated loans
Loans	1	1
Core Banking Activities | Purchased Credit Impaired Loans - Substandard
Risk category of rated loans
Loans	1,896	2,366
Core Banking Activities | Purchased Credit Impaired Loans - Substandard | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	1,799	2,267
Core Banking Activities | Purchased Credit Impaired Loans - Substandard | Home equity lines of credit
Risk category of rated loans
Loans	97	99
Core Banking Activities | Rated Loans
Risk category of rated loans
Loans	2,000,049	2,079,844
Core Banking Activities | Rated Loans | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	35,506	36,946
Core Banking Activities | Rated Loans | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	2,246	2,294
Core Banking Activities | Rated Loans | Commercial Real Estate
Risk category of rated loans
Loans	1,049,193	1,060,496
Core Banking Activities | Rated Loans | Construction & land development
Risk category of rated loans
Loans	130,766	119,650
Core Banking Activities | Rated Loans | Commercial & Industrial
Risk category of rated loans
Loans	270,652	259,026
Core Banking Activities | Rated Loans | Lease Financing Receivables
Risk category of rated loans
Loans	13,853	13,614
Core Banking Activities | Rated Loans | Warehouse lines of credit
Risk category of rated loans
Loans	495,165	585,439
Core Banking Activities | Rated Loans | Home equity lines of credit
Risk category of rated loans
Loans	2,456	2,212
Core Banking Activities | Rated Loans | Other consumer
Risk category of rated loans
Loans	212	167
Republic Processing Group
Risk category of rated loans
Loans	42,707	38,947
Republic Processing Group | Commercial & Industrial
Risk category of rated loans
Loans	14	6,695
Republic Processing Group | Pass
Risk category of rated loans
Loans	14	6,695
Republic Processing Group | Pass | Commercial & Industrial
Risk category of rated loans
Loans	14	6,695
Republic Processing Group | Substandard
Risk category of rated loans
Loans	122	82
Republic Processing Group | Rated Loans
Risk category of rated loans
Loans	136	6,777
Republic Processing Group | Rated Loans | Commercial & Industrial
Risk category of rated loans
Loans	14	6,695
Easy Advances | Republic Processing Group
Risk category of rated loans
Loans	10,672
Republic Credit Solutions | Republic Processing Group
Risk category of rated loans
Loans	32,021	32,252
Republic Credit Solutions | Republic Processing Group | Substandard
Risk category of rated loans
Loans	122	82
Republic Credit Solutions | Republic Processing Group | Rated Loans
Risk category of rated loans
Loans	$ 122	$ 82