ALLOWANCE FOR CREDIT LOSSES - Changes in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	$ 117,885	$ 159,590	$ 131,992	$ 175,679
Provision for Credit Losses-loans and leases	7,898	(8,193)	(1,958)	(9,499)
Loans charged off	(2,658)	(4,188)	(10,899)	(20,532)
Recoveries	971	1,694	4,961	3,255
Total net charge-offs	(1,687)	(2,494)	(5,938)	(17,277)
Balance at end of year	124,096	148,903	124,096	148,903
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	39,179	46,797	44,052	51,454
Provision for Credit Losses-loans and leases	3,710	(1,515)	1,899	4,925
Loans charged off	(1,947)	(2,617)	(5,565)	(14,256)
Recoveries	90	869	646	1,411
Total net charge-offs	(1,857)	(1,748)	(4,919)	(12,845)
Balance at end of year	41,032	43,534	41,032	43,534
Lease financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	2,212	1,457	1,633	995
Provision for Credit Losses-loans and leases	238	(374)	920	88
Loans charged off	(13)	0	(152)	0
Recoveries	13	0	49	0
Total net charge-offs	0	0	(103)	0
Balance at end of year	2,450	1,083	2,450	1,083
Construction real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	11,965	20,359	11,874	21,736
Provision for Credit Losses-loans and leases	2,081	(4,969)	2,172	(6,347)
Loans charged off	0	0	0	(2)
Recoveries	0	0	0	3
Total net charge-offs	0	0	0	1
Balance at end of year	14,046	15,390	14,046	15,390
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	39,856	70,305	53,420	76,795
Provision for Credit Losses-loans and leases	(2,343)	(904)	(14,904)	(4,373)
Loans charged off	(3)	(1,030)	(3,422)	(4,321)
Recoveries	561	223	2,977	493
Total net charge-offs	558	(807)	(445)	(3,828)
Balance at end of year	38,071	68,594	38,071	68,594
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	7,383	6,879	6,225	8,560
Provision for Credit Losses-loans and leases	2,123	(381)	3,183	(2,113)
Loans charged off	(119)	(74)	(145)	(121)
Recoveries	35	56	159	154
Total net charge-offs	(84)	(18)	14	33
Balance at end of year	9,422	6,480	9,422	6,480
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	10,980	9,684	9,643	11,869
Provision for Credit Losses-loans and leases	500	(372)	1,255	(2,200)
Loans charged off	(45)	(200)	(88)	(1,051)
Recoveries	185	426	810	920
Total net charge-offs	140	226	722	(131)
Balance at end of year	11,620	9,538	11,620	9,538
Installment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	1,189	1,211	1,097	1,215
Provision for Credit Losses-loans and leases	3,931	(50)	4,493	(12)
Loans charged off	(294)	(37)	(832)	(150)
Recoveries	29	53	97	124
Total net charge-offs	(265)	16	(735)	(26)
Balance at end of year	4,855	1,177	4,855	1,177
Credit card
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	5,121	2,898	4,048	3,055
Provision for Credit Losses-loans and leases	(2,342)	372	(976)	533
Loans charged off	(237)	(230)	(695)	(631)
Recoveries	58	67	223	150
Total net charge-offs	179	163	472	481
Balance at end of year	$ 2,600	$ 3,107	$ 2,600	$ 3,107