LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by Risk Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	$ 6,314,732	$ 5,989,264
Year two	4,623,480	2,709,114
Year three	2,371,371	1,925,433
Year four	1,436,088	1,037,226
Year five	740,973	898,344
Prior	2,093,789	1,925,757
Revolving Loans Amortized Cost Basis	2,274,820	1,389,120
Loans, net of unearned income	19,855,253	15,874,258
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	6,284,768	5,955,415
Year two	4,578,661	2,693,326
Year three	2,340,683	1,886,100
Year four	1,361,730	981,400
Year five	699,846	879,708
Prior	2,027,031	1,838,522
Revolving Loans Amortized Cost Basis	2,221,009	1,379,853
Loans, net of unearned income	19,513,728	15,614,324
6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,158	7,278
Year two	18,132	615
Year three	188	2,535
Year four	31,712	30,976
Year five	6,233	6,068
Prior	23,247	29,469
Revolving Loans Amortized Cost Basis	23,944	2,015
Loans, net of unearned income	104,614	78,956
7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	28,806	26,571
Year two	26,687	15,173
Year three	30,500	36,798
Year four	42,646	24,850
Year five	34,894	12,568
Prior	43,511	57,766
Revolving Loans Amortized Cost Basis	29,867	7,252
Loans, net of unearned income	236,911	180,978
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,135,685	913,036
Year two	527,270	280,305
Year three	175,396	193,301
Year four	112,588	120,512
Year five	58,097	53,671
Prior	46,145	48,227
Revolving Loans Amortized Cost Basis	624,222	266,941
Loans, net of unearned income	2,679,403	1,875,993
Commercial, financial and agricultural | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,127,120	903,630
Year two	526,043	279,037
Year three	174,120	188,810
Year four	109,091	118,613
Year five	56,657	50,737
Prior	41,612	40,376
Revolving Loans Amortized Cost Basis	621,784	262,951
Loans, net of unearned income	2,656,427	1,844,154
Commercial, financial and agricultural | 6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	190
Year two	13	0
Year three	94	393
Year four	183	427
Year five	895	368
Prior	1,774	1,832
Revolving Loans Amortized Cost Basis	317	1,961
Loans, net of unearned income	3,276	5,171
Commercial, financial and agricultural | 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	8,565	9,216
Year two	1,214	1,268
Year three	1,182	4,098
Year four	3,314	1,472
Year five	545	2,566
Prior	2,759	6,019
Revolving Loans Amortized Cost Basis	2,121	2,029
Loans, net of unearned income	19,700	26,668
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	41,593	35,840
Year two	12,754	59,504
Year three	38,122	37,485
Year four	23,560	27,482
Year five	17,262	9,890
Prior	14,354	11,561
Revolving Loans Amortized Cost Basis	236,392	9,536
Loans, net of unearned income	384,037	191,298
Consumer | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	41,487	35,781
Year two	12,692	59,221
Year three	37,906	37,195
Year four	23,454	27,266
Year five	17,144	9,787
Prior	13,825	11,021
Revolving Loans Amortized Cost Basis	236,113	9,437
Loans, net of unearned income	382,621	189,708
Consumer | 6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	38	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	98	135
Revolving Loans Amortized Cost Basis	196	5
Loans, net of unearned income	332	140
Consumer | 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	68	59
Year two	62	283
Year three	216	290
Year four	106	216
Year five	118	103
Prior	431	405
Revolving Loans Amortized Cost Basis	83	94
Loans, net of unearned income	1,084	1,450
Indirect automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	20,331
Year four	11,941	102,227
Year five	50,898	90,688
Prior	45,809	52,533
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	108,648	265,779
Indirect automobile | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	20,276
Year four	11,900	101,969
Year five	50,749	90,294
Prior	45,120	51,468
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	107,769	264,007
Indirect automobile | 6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	24
Year five	0	10
Prior	11	19
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	11	53
Indirect automobile | 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	55
Year four	41	234
Year five	149	384
Prior	678	1,046
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	868	1,719
Mortgage warehouse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	1,038,924	787,837
Loans, net of unearned income	1,038,924	787,837
Mortgage warehouse | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	990,106	787,837
Loans, net of unearned income	990,106	787,837
Mortgage warehouse | 6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0
Year two	0
Year three	0
Year four	0
Year five	0
Prior	0
Revolving Loans Amortized Cost Basis	22,831
Loans, net of unearned income	22,831
Mortgage warehouse | 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0
Year two	0
Year three	0
Year four	0
Year five	0
Prior	0
Revolving Loans Amortized Cost Basis	25,987
Loans, net of unearned income	25,987
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	18,074	44,727
Year two	46,809	219,385
Year three	188,507	14,831
Year four	9,752	5,494
Year five	4,358	109,040
Prior	241,651	179,224
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	509,151	572,701
Municipal | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	18,074	44,727
Year two	46,809	219,385
Year three	188,507	14,831
Year four	9,752	5,494
Year five	4,358	109,040
Prior	241,651	179,224
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	509,151	572,701
Premium finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,013,265	796,923
Year two	10,202	1,154
Year three	12	26
Year four	0	0
Year five	0	302
Prior	0	4
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	1,023,479	798,409
Premium finance | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,000,214	787,884
Year two	9,667	1,059
Year three	12	26
Year four	0	0
Year five	0	302
Prior		4
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	1,009,893	789,275
Premium finance | 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	13,051	9,039
Year two	535	95
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	13,586	9,134
Real estate – construction and development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	835,108	833,764
Year two	794,506	292,041
Year three	306,248	176,483
Year four	69,601	53,509
Year five	21,266	24,590
Prior	32,235	47,626
Revolving Loans Amortized Cost Basis	27,474	24,326
Loans, net of unearned income	2,086,438	1,452,339
Real estate – construction and development | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	834,831	826,094
Year two	793,723	290,814
Year three	306,084	176,476
Year four	69,596	35,773
Year five	7,934	24,533
Prior	31,490	44,514
Revolving Loans Amortized Cost Basis	27,474	21,267
Loans, net of unearned income	2,071,132	1,419,471
Real estate – construction and development | 6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	277	6,527
Year two	0	549
Year three	0	0
Year four	0	15,260
Year five	173	0
Prior	165	2,101
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	615	24,437
Real estate – construction and development | 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	0	1,143
Year two	783	678
Year three	164	7
Year four	5	2,476
Year five	13,159	57
Prior	580	1,011
Revolving Loans Amortized Cost Basis	0	3,059
Loans, net of unearned income	14,691	8,431
Real estate – commercial and farmland
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,740,015	2,191,416
Year two	1,995,787	1,208,260
Year three	1,088,164	1,131,384
Year four	911,964	566,131
Year five	458,639	496,672
Prior	1,299,450	1,160,655
Revolving Loans Amortized Cost Basis	110,848	80,399
Loans, net of unearned income	7,604,867	6,834,917
Real estate – commercial and farmland | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,739,021	2,186,291
Year two	1,975,003	1,205,578
Year three	1,085,086	1,119,239
Year four	869,116	542,295
Year five	447,311	486,477
Prior	1,259,763	1,103,675
Revolving Loans Amortized Cost Basis	110,848	80,379
Loans, net of unearned income	7,486,148	6,723,934
Real estate – commercial and farmland | 6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	607	416
Year two	17,974	0
Year three	0	1,036
Year four	30,841	14,760
Year five	4,801	5,334
Prior	18,289	21,665
Revolving Loans Amortized Cost Basis	0	0
Loans, net of unearned income	72,512	43,211
Real estate – commercial and farmland | 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	387	4,709
Year two	2,810	2,682
Year three	3,078	11,109
Year four	12,007	9,076
Year five	6,527	4,861
Prior	21,398	35,315
Revolving Loans Amortized Cost Basis	0	20
Loans, net of unearned income	46,207	67,772
Real estate – residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,530,992	1,173,558
Year two	1,236,152	648,465
Year three	574,922	351,592
Year four	296,682	161,871
Year five	130,453	113,491
Prior	414,145	425,927
Revolving Loans Amortized Cost Basis	236,960	220,081
Loans, net of unearned income	4,420,306	3,094,985
Real estate – residential | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	1,524,021	1,171,008
Year two	1,214,724	638,232
Year three	548,968	329,247
Year four	268,821	149,990
Year five	115,693	108,538
Prior	393,570	408,240
Revolving Loans Amortized Cost Basis	234,684	217,982
Loans, net of unearned income	4,300,481	3,023,237
Real estate – residential | 6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	236	145
Year two	145	66
Year three	94	1,106
Year four	688	505
Year five	364	356
Prior	2,910	3,717
Revolving Loans Amortized Cost Basis	600	49
Loans, net of unearned income	5,037	5,944
Real estate – residential | 7
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one	6,735	2,405
Year two	21,283	10,167
Year three	25,860	21,239
Year four	27,173	11,376
Year five	14,396	4,597
Prior	17,665	13,970
Revolving Loans Amortized Cost Basis	1,676	2,050
Loans, net of unearned income	$ 114,788	$ 65,804