ALLOWANCE FOR CREDIT LOSSES - Changes in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	$ 156,185	$ 148,646	$ 141,433	$ 132,977
Provision for Credit Losses-loans and leases	9,930	12,907	39,506	34,270
Loans charged off	(8,528)	(17,023)	(24,700)	(26,604)
Recoveries	1,244	671	2,592	4,558
Total net charge-offs	(7,284)	(16,352)	(22,108)	(22,046)
Balance at end of year	158,831	145,201	158,831	145,201
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	49,312	42,627	44,319	42,313
Provision for Credit Losses-loans and leases	5,698	(584)	15,137	2,092
Loans charged off	(5,471)	(9,207)	(10,315)	(12,309)
Recoveries	434	335	832	1,075
Total net charge-offs	(5,037)	(8,872)	(9,483)	(11,234)
Balance at end of year	49,973	33,171	49,973	33,171
Lease financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	13,919	8,069	12,365	3,571
Provision for Credit Losses-loans and leases	1,502	2,918	3,189	7,517
Loans charged off	(368)	(76)	(561)	(179)
Recoveries	11	1	71	3
Total net charge-offs	(357)	(75)	(490)	(176)
Balance at end of year	15,064	10,912	15,064	10,912
Construction real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	19,678	11,778	11,003	13,527
Provision for Credit Losses-loans and leases	1	(821)	8,676	(2,570)
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	19,679	10,957	19,679	10,957
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	34,022	44,451	34,903	41,106
Provision for Credit Losses-loans and leases	770	7,088	5,035	10,756
Loans charged off	(261)	(6,008)	(5,582)	(8,722)
Recoveries	25	39	200	2,430
Total net charge-offs	(236)	(5,969)	(5,382)	(6,292)
Balance at end of year	34,556	45,570	34,556	45,570
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	18,415	19,405	18,088	12,684
Provision for Credit Losses-loans and leases	163	1,969	500	8,531
Loans charged off	(60)	(10)	(131)	(30)
Recoveries	22	44	83	223
Total net charge-offs	(38)	34	(48)	193
Balance at end of year	18,540	21,408	18,540	21,408
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	13,890	15,067	13,322	12,447
Provision for Credit Losses-loans and leases	618	1,138	1,135	3,558
Loans charged off	(90)	(54)	(237)	(166)
Recoveries	240	125	438	437
Total net charge-offs	150	71	201	271
Balance at end of year	14,658	16,276	14,658	16,276
Installment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	4,928	4,466	4,888	4,945
Provision for Credit Losses-loans and leases	637	1,303	4,583	3,719
Loans charged off	(1,510)	(1,349)	(5,780)	(4,388)
Recoveries	421	87	785	231
Total net charge-offs	(1,089)	(1,262)	(4,995)	(4,157)
Balance at end of year	4,476	4,507	4,476	4,507
Credit card
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	2,021	2,783	2,545	2,384
Provision for Credit Losses-loans and leases	541	(104)	1,251	667
Loans charged off	(768)	(319)	(2,094)	(810)
Recoveries	91	40	183	159
Total net charge-offs	677	279	1,911	651
Balance at end of year	$ 1,885	$ 2,400	$ 1,885	$ 2,400