ALLOWANCE FOR CREDIT LOSSES - Changes in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	$ 148,646	$ 117,885	$ 132,977	$ 131,992
Provision for Credit Losses-loans and leases	12,907	7,898	34,270	(1,958)
Loans charged off	(17,023)	(2,658)	(26,604)	(10,899)
Recoveries	671	971	4,558	4,961
Total net charge-offs	(16,352)	(1,687)	(22,046)	(5,938)
Balance at end of year	145,201	124,096	145,201	124,096
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	42,627	39,179	42,313	44,052
Provision for Credit Losses-loans and leases	(584)	3,710	2,092	1,899
Loans charged off	(9,207)	(1,947)	(12,309)	(5,565)
Recoveries	335	90	1,075	646
Total net charge-offs	(8,872)	(1,857)	(11,234)	(4,919)
Balance at end of year	33,171	41,032	33,171	41,032
Lease financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	8,069	2,212	3,571	1,633
Provision for Credit Losses-loans and leases	2,918	238	7,517	920
Loans charged off	(76)	(13)	(179)	(152)
Recoveries	1	13	3	49
Total net charge-offs	(75)	0	(176)	(103)
Balance at end of year	10,912	2,450	10,912	2,450
Construction real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	11,778	11,965	13,527	11,874
Provision for Credit Losses-loans and leases	(821)	2,081	(2,570)	2,172
Loans charged off	0	0	0	0
Recoveries	0	0	0	0
Total net charge-offs	0	0	0	0
Balance at end of year	10,957	14,046	10,957	14,046
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	44,451	39,856	41,106	53,420
Provision for Credit Losses-loans and leases	7,088	(2,343)	10,756	(14,904)
Loans charged off	(6,008)	(3)	(8,722)	(3,422)
Recoveries	39	561	2,430	2,977
Total net charge-offs	(5,969)	558	(6,292)	(445)
Balance at end of year	45,570	38,071	45,570	38,071
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	19,405	7,383	12,684	6,225
Provision for Credit Losses-loans and leases	1,969	2,123	8,531	3,183
Loans charged off	(10)	(119)	(30)	(145)
Recoveries	44	35	223	159
Total net charge-offs	34	(84)	193	14
Balance at end of year	21,408	9,422	21,408	9,422
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	15,067	10,980	12,447	9,643
Provision for Credit Losses-loans and leases	1,138	500	3,558	1,255
Loans charged off	(54)	(45)	(166)	(88)
Recoveries	125	185	437	810
Total net charge-offs	71	140	271	722
Balance at end of year	16,276	11,620	16,276	11,620
Installment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	4,466	1,189	4,945	1,097
Provision for Credit Losses-loans and leases	1,303	3,931	3,719	4,493
Loans charged off	(1,349)	(294)	(4,388)	(832)
Recoveries	87	29	231	97
Total net charge-offs	(1,262)	(265)	(4,157)	(735)
Balance at end of year	4,507	4,855	4,507	4,855
Credit card
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	2,783	5,121	2,384	4,048
Provision for Credit Losses-loans and leases	(104)	(2,342)	667	(976)
Loans charged off	(319)	(237)	(810)	(695)
Recoveries	40	58	159	223
Total net charge-offs	279	179	651	472
Balance at end of year	$ 2,400	$ 2,600	$ 2,400	$ 2,600