LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Narrative) (Details) $ in Thousands	3 Months Ended			6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) loan	Mar. 31, 2023 USD ($) loan	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) loan	Jun. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) loan	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
SBA PPP Loans, Originations, Number of Contracts Outstanding | loan	4			4			5
Loans and Leases Receivable, Related Parties, Description		At June 30, 2023 and December 31, 2022, outstanding loans to certain officers, directors and their associated companies were less than 5% of the Company's shareholders' equity.		At June 30, 2023 and December 31, 2022, outstanding loans to certain officers, directors and their associated companies were less than 5% of the Company's shareholders' equity.
Proceeds from the sale of mortgage loans				$ 71,780	$ 95,846
Gain on sale of mortgage loans				(761)	(2,165)
Loans held for sale, at fair value (book value of $11,685 and $5,259, respectively)	$ 12,036			12,036			$ 5,197
Allowance for Loan and Lease Losses, Period Increase (Decrease)				61
Allowance for credit losses	36,983	$ 37,134	$ 34,244	36,983	34,244		36,922	$ 31,770	$ 33,256
(Credit) provision for loan losses	305		2,511	$ 744	1,275	$ 4,430
Other industry exposures				0
Non-Accrual Loans	3,048			$ 3,048			2,991
Loans outstanding	4,100,131			4,100,131			4,010,353
Interest lost on nonaccrual loans	24		38	50	85
Loans and Leases Receivable, Excluded Accrued Interest from Amortized Cost	10,800			10,800			10,300
Recorded Investment							2,566
Loans modified | loan		0
FHLB advances, general debt obligations, pledged collateral	1,900,000			1,900,000			1,800,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,748,303			1,748,303			1,700,266
Allowance for Loan and Lease Losses, Period Increase (Decrease)				$ 1,500
Loan Portfolio Increase (Decrease), Percentage				3.00%
Allowance for credit losses	10,627	$ 10,812	8,438	$ 10,627	8,438		9,089	6,476	6,133
(Credit) provision for loan losses	(214)		1,978	1,523	2,321	3,022
Non-Accrual Loans	1,781			1,781			1,733
Loans outstanding	1,748,303			1,748,303			1,700,266
Mortgage Loans in Process of Foreclosure, Amount	378			378			481
Commercial real estate - non-owner-occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,341,138			1,341,138			1,292,443
Allowance for Loan and Lease Losses, Period Increase (Decrease)				$ (1,100)
Loan Portfolio Increase (Decrease), Percentage				4.00%
Allowance for credit losses	16,155	16,324	16,210	$ 16,155	16,210		17,296	16,572	18,834
(Credit) provision for loan losses	(170)		(362)	(1,143)	(2,625)	(1,541)
Non-Accrual Loans	9			9			11
Loans outstanding	1,341,138			1,341,138			1,292,443
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	422,437			422,437			430,131
Allowance for credit losses	4,795	4,581	5,146	4,795	5,146		5,446	4,842	4,202
(Credit) provision for loan losses	684		397	32	1,225	1,907
Non-Accrual Loans	729			729			715
Loans outstanding	422,437			422,437			430,131
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	232,618			232,618			234,428
Allowance for credit losses	2,397	2,440	1,796	2,397	1,796		2,225	1,435	1,469
(Credit) provision for loan losses	(43)		275	172	241	669
Non-Accrual Loans	466			466			486
Loans outstanding	232,618			232,618			234,428
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	19,771			19,771			20,591
Allowance for credit losses	658	$ 507	153	658	153		504	$ 106	$ 79
(Credit) provision for loan losses	167		61	171	153	$ 552
Non-Accrual Loans	16			16			0
Loans outstanding	19,771			19,771			20,591
Fixed Rate Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from the sale of mortgage loans	36,000		47,000	71,100	93,700
Gain on sale of mortgage loans	(377)		(1,000)	(761)	(2,200)
Loans held for sale, at fair value (book value of $11,685 and $5,259, respectively)	12,100			12,100			5,300
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	422,437			422,437			430,131
Recorded Investment							0
Financing Receivable, Year One, Originated, Current Fiscal Year	20,910			20,910			73,686
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	63,599			63,599			70,162
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	63,046			63,046			32,498
SBA PPP Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	469			469			648
Nonoperating Income (Expense) | Fixed Rate Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain on sale of mortgage loans	(65)		$ 73	$ 20	$ (69)
Unrealized gain (loss) on loans held for sale	42						62
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Total Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (percentage)				13.00%
Non-Residential Building Operators Industry Sector | Loan Concentration Risk | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (percentage)				32.00%
Residential Building Operators Industry Sector | Loan Concentration Risk | Total Loan Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (percentage)				11.00%
Residential Building Operators Industry Sector | Loan Concentration Risk | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (percentage)				26.00%
Substandard [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,352			$ 4,352			5,156
Financing Receivable, Year One, Originated, Current Fiscal Year	189			189			149
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	253			253			52
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	49			49			133
Pass [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	417,061			417,061			423,274
Financing Receivable, Year One, Originated, Current Fiscal Year	20,721			20,721			73,537
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	63,346			63,346			70,110
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	$ 62,997			$ 62,997			32,272
Performing Financial Instruments [Member] | Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment							2,100
Nonperforming Financial Instruments [Member] | Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment							$ 452