LOANS AND CREDIT QUALITY (Class and Credit Indicator) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	$ 74,123	$ 1,004,473
Fiscal year before current fiscal year	1,028,674	1,293,071
Two years before current fiscal year	1,271,125	691,126
Three years before current fiscal year	671,962	414,136
Four years before current fiscal year	392,067	288,522
Five years before current fiscal year	1,321,470	1,063,474
Amortized Cost of Revolving Loans	797,976	800,664
Total	5,557,397	5,555,466
Loans and leases, gross	5,557,946	5,556,312
Net deferred costs (income)	(549)	(846)
Total loans, net of deferred fees and costs	5,557,397	5,555,466
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	0
Year-to-date gross charge-offs, fiscal year before current fiscal year	1,048
Year-to-date gross charge-offs, two years before current fiscal year	1,218
Year-to-date gross charge-offs, three years before current fiscal year	200
Year-to-date gross charge-offs, four years before current fiscal year	371
Year-to-date gross charge-offs, five years before current fiscal year	628
Year-to-date gross charge-offs, Amortized Cost of Revolving Loans	0
Year-to-date gross charge-offs, Total	3,465
Accruing Loans 30 - 59 Days Past Due
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	11,955	8,193
Commercial, financial and agricultural: \| Small Business Administration Paycheck Protection Program
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	2,546
Two years before current fiscal year	0	9
Three years before current fiscal year	1,813	0
Four years before current fiscal year	8	0
Five years before current fiscal year	0	0
Amortized Cost of Revolving Loans	0	0
Total	1,821	2,555
Loans and leases, gross	1,883	2,654
Commercial, financial and agricultural: \| Small Business Administration Paycheck Protection Program \| Accruing Loans 30 - 59 Days Past Due
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	0	471
Commercial, financial and agricultural: \| Small Business Administration Paycheck Protection Program \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	2,546
Two years before current fiscal year	0	9
Three years before current fiscal year	1,813	0
Four years before current fiscal year	8	0
Five years before current fiscal year	0	0
Amortized Cost of Revolving Loans	0	0
Total	1,821	2,555
Commercial, financial and agricultural: \| Other
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	15,746	79,944
Fiscal year before current fiscal year	92,071	102,121
Two years before current fiscal year	100,019	42,363
Three years before current fiscal year	39,965	54,508
Four years before current fiscal year	56,150	39,251
Five years before current fiscal year	174,464	149,165
Amortized Cost of Revolving Loans	76,649	76,595
Total	555,064	543,947
Loans and leases, gross	555,508	544,495
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	0
Year-to-date gross charge-offs, fiscal year before current fiscal year	144
Year-to-date gross charge-offs, two years before current fiscal year	32
Year-to-date gross charge-offs, three years before current fiscal year	0
Year-to-date gross charge-offs, four years before current fiscal year	191
Year-to-date gross charge-offs, five years before current fiscal year	412
Year-to-date gross charge-offs, Amortized Cost of Revolving Loans	0
Year-to-date gross charge-offs, Total	779
Commercial, financial and agricultural: \| Other \| Accruing Loans 30 - 59 Days Past Due
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	1,114	546
Commercial, financial and agricultural: \| Other \| Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	2,206
Fiscal year before current fiscal year	1,025	350
Two years before current fiscal year	326	172
Three years before current fiscal year	158	1,011
Four years before current fiscal year	866	29
Five years before current fiscal year	3	0
Amortized Cost of Revolving Loans	0	99
Total	2,378	3,867
Commercial, financial and agricultural: \| Other \| Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	188
Fiscal year before current fiscal year	198	176
Two years before current fiscal year	191	833
Three years before current fiscal year	786	256
Four years before current fiscal year	223	116
Five years before current fiscal year	7,213	7,215
Amortized Cost of Revolving Loans	99	30
Total	8,710	8,814
Commercial, financial and agricultural: \| Other \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	15,746	77,550
Fiscal year before current fiscal year	90,848	101,595
Two years before current fiscal year	99,502	41,358
Three years before current fiscal year	39,021	53,241
Four years before current fiscal year	55,061	39,106
Five years before current fiscal year	167,248	141,950
Amortized Cost of Revolving Loans	76,550	76,466
Total	543,976	531,266
Real Estate \| Construction
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	25,663
Fiscal year before current fiscal year	43,148	66,294
Two years before current fiscal year	72,759	23,384
Three years before current fiscal year	17,634	3,083
Four years before current fiscal year	3,051	15,207
Five years before current fiscal year	31,741	18,048
Amortized Cost of Revolving Loans	13,141	15,044
Total	181,474	166,723
Loans and leases, gross	182,091	167,366
Real Estate \| Construction \| Accruing Loans 30 - 59 Days Past Due
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	0	0
Real Estate \| Construction \| Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year		0
Fiscal year before current fiscal year		417
Two years before current fiscal year		0
Three years before current fiscal year		0
Four years before current fiscal year		898
Five years before current fiscal year		0
Amortized Cost of Revolving Loans		0
Total		1,315
Real Estate \| Construction \| Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	4,850
Two years before current fiscal year	5,264	0
Three years before current fiscal year	0	696
Four years before current fiscal year	688	0
Five years before current fiscal year	0	0
Amortized Cost of Revolving Loans	0	0
Total	5,952	5,546
Real Estate \| Construction \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	25,663
Fiscal year before current fiscal year	43,148	61,027
Two years before current fiscal year	67,495	23,384
Three years before current fiscal year	17,634	2,387
Four years before current fiscal year	2,363	14,309
Five years before current fiscal year	31,741	18,048
Amortized Cost of Revolving Loans	13,141	15,044
Total	175,522	159,862
Real Estate \| Home Equity
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	2,621	34,973
Fiscal year before current fiscal year	34,091	23,772
Two years before current fiscal year	22,823	10,520
Three years before current fiscal year	10,251	7,463
Four years before current fiscal year	7,139	6,958
Five years before current fiscal year	19,792	12,180
Amortized Cost of Revolving Loans	647,191	643,514
Total	743,908	739,380
Loans and leases, gross	741,894	737,386
Real Estate \| Home Equity \| Accruing Loans 30 - 59 Days Past Due
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	442	1,540
Real Estate \| Home Equity \| Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year		0
Fiscal year before current fiscal year		0
Two years before current fiscal year		0
Three years before current fiscal year		0
Four years before current fiscal year		0
Five years before current fiscal year		0
Amortized Cost of Revolving Loans		198
Total		198
Real Estate \| Home Equity \| Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	73	78
Five years before current fiscal year	638	453
Amortized Cost of Revolving Loans	0	39
Total	711	570
Real Estate \| Home Equity \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	2,621	34,973
Fiscal year before current fiscal year	34,091	23,772
Two years before current fiscal year	22,823	10,520
Three years before current fiscal year	10,251	7,463
Four years before current fiscal year	7,066	6,880
Five years before current fiscal year	19,154	11,727
Amortized Cost of Revolving Loans	647,191	643,277
Total	743,197	738,612
Real Estate \| Commercial mortgage
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	1,361,632	1,363,075
Real Estate \| Commercial mortgage \| Accruing Loans 30 - 59 Days Past Due
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	0	160
Real Estate \| Residential Mortgage
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	27,065	279,146
Fiscal year before current fiscal year	276,052	636,756
Two years before current fiscal year	631,544	435,876
Three years before current fiscal year	431,022	154,906
Four years before current fiscal year	153,042	58,934
Five years before current fiscal year	422,505	375,381
Amortized Cost of Revolving Loans	0	0
Total	1,941,230	1,940,999
Loans and leases, gross	1,940,639	1,940,456
Real Estate \| Residential Mortgage \| Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	948
Three years before current fiscal year	941	0
Four years before current fiscal year	0	503
Five years before current fiscal year	3,445	3,864
Amortized Cost of Revolving Loans	0	0
Total	4,386	5,315
Real Estate \| Residential Mortgage \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	27,065	279,146
Fiscal year before current fiscal year	276,052	636,756
Two years before current fiscal year	631,544	434,928
Three years before current fiscal year	430,081	154,906
Four years before current fiscal year	153,042	58,431
Five years before current fiscal year	419,060	371,517
Amortized Cost of Revolving Loans	0	0
Total	1,936,844	1,935,684
Real Estate \| Commercial Mortgage
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	6,236
Fiscal year before current fiscal year	235,341
Two years before current fiscal year	217,398
Three years before current fiscal year	118,627
Four years before current fiscal year	128,286
Five years before current fiscal year	646,829
Amortized Cost of Revolving Loans	8,915
Total	1,361,632
Loans and leases, gross	1,363,507	1,364,998
Real Estate \| Commercial Mortgage \| Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	11,388
Four years before current fiscal year	11,169	0
Five years before current fiscal year	13,174	16,082
Amortized Cost of Revolving Loans	0	0
Total	24,343	27,470
Real Estate \| Commercial Mortgage \| Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	10,149
Two years before current fiscal year	10,140	0
Three years before current fiscal year	0	1,700
Four years before current fiscal year	1,691	2,133
Five years before current fiscal year	10,297	8,103
Amortized Cost of Revolving Loans	0	0
Total	22,128	22,085
Real Estate \| Commercial Mortgage \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	6,236	226,137
Fiscal year before current fiscal year	235,341	208,230
Two years before current fiscal year	207,258	119,531
Three years before current fiscal year	118,627	129,950
Four years before current fiscal year	115,426	145,932
Five years before current fiscal year	623,358	472,267
Amortized Cost of Revolving Loans	8,915	11,473
Total	1,315,161	1,313,520
Consumer \| Consumer
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	22,455	358,610
Fiscal year before current fiscal year	347,971	243,203
Two years before current fiscal year	226,582	59,443
Three years before current fiscal year	52,650	51,138
Four years before current fiscal year	44,391	20,107
Five years before current fiscal year	26,139	12,248
Amortized Cost of Revolving Loans	52,080	54,038
Total	772,268	798,787
Loans and leases, gross	772,424	798,957
Consumer \| Consumer \| Special Mention
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year		0
Fiscal year before current fiscal year		0
Two years before current fiscal year		0
Three years before current fiscal year		113
Four years before current fiscal year		0
Five years before current fiscal year		0
Amortized Cost of Revolving Loans		0
Total		113
Consumer \| Consumer \| Substandard
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	1
Fiscal year before current fiscal year	77	261
Two years before current fiscal year	365	91
Three years before current fiscal year	119	126
Four years before current fiscal year	144	42
Five years before current fiscal year	834	790
Amortized Cost of Revolving Loans	1	0
Total	1,540	1,311
Consumer \| Consumer \| Loss
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	0	0
Fiscal year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
Five years before current fiscal year	1,183	500
Amortized Cost of Revolving Loans	0	0
Total	1,183	500
Consumer \| Consumer \| Pass
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Current fiscal year	22,455	358,609
Fiscal year before current fiscal year	347,894	242,942
Two years before current fiscal year	226,217	59,352
Three years before current fiscal year	52,531	50,899
Four years before current fiscal year	44,247	20,065
Five years before current fiscal year	24,122	10,958
Amortized Cost of Revolving Loans	52,079	54,038
Total	769,545	796,863
Consumer \| Consumer Loan
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	772,268	798,787
Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year [Abstract]
Year-to-date gross charge-offs, Current fiscal year	0
Year-to-date gross charge-offs, fiscal year before current fiscal year	904
Year-to-date gross charge-offs, two years before current fiscal year	1,186
Year-to-date gross charge-offs, three years before current fiscal year	200
Year-to-date gross charge-offs, four years before current fiscal year	180
Year-to-date gross charge-offs, five years before current fiscal year	216
Year-to-date gross charge-offs, Amortized Cost of Revolving Loans	0
Year-to-date gross charge-offs, Total	2,686
Consumer \| Consumer Loan \| Accruing Loans 30 - 59 Days Past Due
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total	$ 4,415	$ 5,173

Financing Receivable, Allowance For Credit Loss, Write Off, By Origination Year

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Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Allowance For Credit Loss, Writeoff

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Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Allowance for Credit Loss, Writeoff

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Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Allowance for Credit Loss, Writeoff

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Financing Receivable, Year One, Originated, Current Fiscal Year, Allowance For Credit Loss, Writeoff

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Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Allowance for Credit Loss, Writeoff

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Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Allowance for Credit Loss, Writeoff

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amortized cost of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost of financing receivable originated in current fiscal year. Excludes net investment in lease.

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Amortized cost of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

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Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost of financing receivable that can be withdrawn, repaid, and redrawn.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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