ALLOWANCE FOR CREDIT LOSSES - Changes in the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	$ 124,130	$ 169,923	$ 131,992	$ 175,679
Provision for Credit Losses-loans and leases	(4,267)	(4,756)	(9,856)	(1,306)
Loans charged off	(4,799)	(6,312)	(8,241)	(16,344)
Recoveries	2,821	735	3,990	1,561
Total net charge-offs	(1,978)	(5,577)	(4,251)	(14,783)
Balance at end of year	117,885	159,590	117,885	159,590
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	37,783	45,139	44,052	51,454
Provision for Credit Losses-loans and leases	1,992	5,182	(1,811)	6,440
Loans charged off	(773)	(3,729)	(3,618)	(11,639)
Recoveries	177	205	556	542
Total net charge-offs	(596)	(3,524)	(3,062)	(11,097)
Balance at end of year	39,179	46,797	39,179	46,797
Lease financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	2,093	1,015	1,633	995
Provision for Credit Losses-loans and leases	124	442	682	462
Loans charged off	(8)	0	(139)	0
Recoveries	3	0	36	0
Total net charge-offs	(5)	0	(103)	0
Balance at end of year	2,212	1,457	2,212	1,457
Construction real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	11,410	22,734	11,874	21,736
Provision for Credit Losses-loans and leases	555	(2,378)	91	(1,378)
Loans charged off	0	0	0	(2)
Recoveries	0	3	0	3
Total net charge-offs	0	3	0	1
Balance at end of year	11,965	20,359	11,965	20,359
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	51,512	78,669	53,420	76,795
Provision for Credit Losses-loans and leases	(10,431)	(6,398)	(12,561)	(3,469)
Loans charged off	(3,419)	(2,041)	(3,419)	(3,291)
Recoveries	2,194	75	2,416	270
Total net charge-offs	(1,225)	(1,966)	(1,003)	(3,021)
Balance at end of year	39,856	70,305	39,856	70,305
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	6,152	7,748	6,225	8,560
Provision for Credit Losses-loans and leases	1,201	(877)	1,060	(1,732)
Loans charged off	(4)	(46)	(26)	(47)
Recoveries	34	54	124	98
Total net charge-offs	30	8	98	51
Balance at end of year	7,383	6,879	7,383	6,879
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	9,676	10,760	9,643	11,869
Provision for Credit Losses-loans and leases	966	(1,153)	755	(1,828)
Loans charged off	(22)	(240)	(43)	(851)
Recoveries	360	317	625	494
Total net charge-offs	338	77	582	(357)
Balance at end of year	10,980	9,684	10,980	9,684
Installment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	1,075	1,235	1,097	1,215
Provision for Credit Losses-loans and leases	428	16	562	38
Loans charged off	(361)	(77)	(538)	(113)
Recoveries	47	37	68	71
Total net charge-offs	(314)	(40)	(470)	(42)
Balance at end of year	1,189	1,211	1,189	1,211
Credit card
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance at beginning of year	4,429	2,623	4,048	3,055
Provision for Credit Losses-loans and leases	898	410	1,366	161
Loans charged off	(212)	(179)	(458)	(401)
Recoveries	6	44	165	83
Total net charge-offs	206	135	293	318
Balance at end of year	$ 5,121	$ 2,898	$ 5,121	$ 2,898