LOANS AND ALLOWANCE FOR CREDIT LOSSES - COMPOSITION OF LOANS (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Loans disclosures
Lease financing receivables	$ 93,159	$ 93,304
Total loans	5,289,793	5,439,466	$ 5,224,292
Allowance for credit losses	(106,303)	(91,978)	(108,702)	$ (82,130)
Loans, net	5,183,490	5,347,488
Core Banking Activities
Loans disclosures
Total loans	5,135,861	5,119,939	5,036,899
Allowance for credit losses	(60,272)	(61,130)	(60,332)	(59,845)
Traditional Banking
Loans disclosures
Lease financing receivables	93,159	93,304
Total loans	4,566,359	4,569,179	4,573,650
Allowance for credit losses	(58,851)	(59,756)	(59,176)	$ (58,998)
Warehouse Lending
Loans disclosures
Total loans	569,502		463,249
Republic Processing Group
Loans disclosures
Total loans	153,932	319,527
Total loans	153,932		187,393
Tax Refund Solutions
Loans disclosures
Total loans	36,185		57,497
Republic Credit Solutions
Loans disclosures
Total loans	117,747		$ 129,896
Home Equity
Loans disclosures
Total loans	365,631
Residential real estate | Residential Real Estate - Owner Occupied
Loans disclosures
Total loans	1,025,461	1,032,459
Residential real estate | Residential Real Estate - Owner Occupied | Traditional Banking
Loans disclosures
Total loans	1,025,461	1,032,459
Residential real estate | Residential Real Estate - Non Owner Occupied
Loans disclosures
Total loans	311,955	318,096
Residential real estate | Residential Real Estate - Non Owner Occupied | Traditional Banking
Loans disclosures
Total loans	311,955	318,096
Residential real estate | Home Equity
Loans disclosures
Total loans		353,441
Residential real estate | Home Equity | Traditional Banking
Loans disclosures
Total loans	365,631	353,441
Commercial real estate | Commercial Real Estate - Owner Occupied
Loans disclosures
Total loans	651,531	659,216
Commercial real estate | Commercial Real Estate - Owner Occupied | Traditional Banking
Loans disclosures
Total loans	651,531	659,216
Commercial real estate | Commercial Real Estate - Non Owner Occupied
Loans disclosures
Total loans	832,504	840,517
Commercial real estate | Commercial Real Estate - Non Owner Occupied | Traditional Banking
Loans disclosures
Total loans	832,504	840,517
Commercial real estate | Commercial Real Estate - Multi-Family
Loans disclosures
Total loans	322,725	313,444
Commercial real estate | Commercial Real Estate - Multi-Family | Traditional Banking
Loans disclosures
Total loans	322,725	313,444
Construction & land development
Loans disclosures
Total loans	238,562	244,121
Construction & land development | Traditional Banking
Loans disclosures
Total loans	238,562	244,121
Commercial & industrial | Commercial and Industrial
Loans disclosures
Total loans	482,955	460,245
Commercial & industrial | Commercial and Industrial | Traditional Banking
Loans disclosures
Total loans	482,955	460,245
Aircraft
Loans disclosures
Total loans	219,292	226,179
Aircraft | Traditional Banking
Loans disclosures
Total loans	219,292	226,179
Consumer
Loans disclosures
Total loans	22,584	28,157
Consumer | Credit Card | Traditional Banking
Loans disclosures
Total loans	11,136	16,464
Consumer | Overdrafts | Traditional Banking
Loans disclosures
Total loans	779	982
Consumer | Automobile loans | Traditional Banking
Loans disclosures
Total loans	1,031	1,156
Consumer | Other Consumer | Traditional Banking
Loans disclosures
Total loans	9,638	9,555
Warehouse lines of credit
Loans disclosures
Total loans	569,502	550,760
Warehouse lines of credit | Warehouse Lending
Loans disclosures
Total loans	569,502	550,760
Tax Refund Solution
Loans disclosures
Total loans	36,185	190,794
Tax Refund Solution | Refund Advances | Tax Refund Solutions
Loans disclosures
Total loans	30,344	138,614
Tax Refund Solution | Other TRS commercial and industrial loans | Tax Refund Solutions
Loans disclosures
Total loans	5,841	52,180
Republic Credit Solution
Loans disclosures
Total loans	117,747	128,733
Republic Credit Solution | Republic Credit Solutions
Loans disclosures
Total loans	$ 117,747	$ 128,733