LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Narrative) (Details)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) loan	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($) loan	Jun. 30, 2022 USD ($) loan	Jun. 30, 2021 USD ($) loan	Dec. 31, 2021 USD ($) loan	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
SBA PPP Loans, Total Originations, Number of Loans | loan						1,620
SBA PPP Loans, Total Originations						$ 102,200,000
Loans and Leases Receivable, Related Parties, Description		At June 30, 2022 and December 31, 2021, outstanding loans to certain officers, directors and their associated companies were less than 5% of the Company's shareholders' equity.		At June 30, 2022 and December 31, 2021, 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				$ 95,846,000	$ 312,474,000
Gain on sale of mortgage loans				2,165,000	9,084,000
Loans held for sale, at fair value (book value of $3,380 and $5,786, respectively)	$ 3,340,000			3,340,000		5,815,000
Allowance for Loan and Lease Losses, Period Increase (Decrease)				1,000,000
Allowance for credit losses	34,244,000	$ 31,770,000	$ 32,060,000	34,244,000	32,060,000	33,256,000	$ 35,775,000	$ 37,865,000
(Credit) provision for loan losses	2,511,000		(3,452,000)	$ 1,275,000	(5,306,000)	(3,817,000)
Other industry exposures				0
Non-Accrual Loans	3,505,000			$ 3,505,000		4,327,000
Loans outstanding	3,724,227,000			3,724,227,000		3,431,474,000
Interest lost on nonaccrual loans	38,000		$ 67,000	85,000	$ 143,000
Loans and Leases Receivable, Excluded Accrued Interest from Amortized Cost	8,500,000			8,500,000		7,800,000
Recorded Investment	2,709,000			2,709,000		2,786,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 0			$ 0		0
Loans modified | loan	0		0	0	0
FHLB advances, general debt obligations, pledged collateral	$ 1,500,000,000			$ 1,500,000,000		1,400,000,000
SBA PPP Loans, 2021 Originations, Outstanding | loan	19			19
Financing Receivable, Year One, Originated, Current Fiscal Year	$ 612,651,000			$ 612,651,000		1,099,415,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	1,039,120,000			1,039,120,000		557,853,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	496,850,000			496,850,000		352,013,000
SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	1,000	4,000	$ 66,000	1,000	$ 66,000	19,000	87,000	69,000
(Credit) provision for loan losses	(3,000)		(21,000)	(18,000)	(3,000)	(50,000)
Loans outstanding	2,509,000			2,509,000		35,953,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	8,438,000	6,476,000	3,205,000	8,438,000	3,205,000	6,133,000	3,093,000	3,474,000
(Credit) provision for loan losses	1,978,000		77,000	2,321,000	(251,000)	2,644,000
Non-Accrual Loans	1,831,000			1,831,000		2,107,000
Loans outstanding	1,517,239,000			1,517,239,000		1,306,447,000
Mortgage Loans in Process of Foreclosure, Amount	607,000			607,000		888,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	5,145,000	4,838,000	4,342,000	5,145,000	4,342,000	4,183,000	5,170,000	6,703,000
(Credit) provision for loan losses	400,000		(636,000)	1,243,000	(2,065,000)	(1,941,000)
Non-Accrual Loans	723,000			723,000		829,000
Loans outstanding	421,220,000			421,220,000		363,695,000
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	1,796,000	1,435,000	2,065,000	1,796,000	2,065,000	1,469,000	2,176,000	2,616,000
(Credit) provision for loan losses	275,000		(4,000)	241,000	(406,000)	(989,000)
Non-Accrual Loans	741,000			741,000		1,175,000
Loans outstanding	230,865,000			230,865,000		210,403,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	153,000	$ 106,000	289,000	153,000	289,000	79,000	$ 228,000	$ 393,000
(Credit) provision for loan losses	61,000		63,000	153,000	(59,000)	(235,000)
Non-Accrual Loans	28,000			28,000		32,000
Loans outstanding	19,480,000			19,480,000		19,516,000
Commercial real estate - non-owner-occupied, hospitality-related
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	768,000			768,000		5,000,000
(Credit) provision for loan losses				(4,200,000)
Fixed Rate Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from the sale of mortgage loans	47,000,000		110,800,000	93,700,000	303,400,000
Gain on sale of mortgage loans	1,000,000		2,900,000	2,200,000	9,100,000
Loans held for sale, at fair value (book value of $3,380 and $5,786, respectively)	3,400,000			3,400,000		5,800,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	66,000			66,000		74,000
Financing Receivable, Year One, Originated, Current Fiscal Year	47,548,000			47,548,000		91,247,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	77,905,000			77,905,000		44,213,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	37,800,000			37,800,000		45,835,000
SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0			0		35,634,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,507,000			2,507,000		319,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,000			2,000		0
Nonoperating Income (Expense) | Fixed Rate Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gain on sale of mortgage loans	73,000		267,000,000,000	$ (69,000)	$ (804,000)
Unrealized gain (loss) on loans held for sale	(40,000)		$ 29,000,000
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%
Substandard [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	23,000			$ 23,000		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	20,000			20,000		339,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	145,000			145,000		320,000
Substandard [Member] | SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0			0		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	0			0		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	0			0		0
Pass [Member] | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	47,525,000			47,525,000		91,102,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	77,885,000			77,885,000		43,757,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	37,550,000			37,550,000		44,925,000
Pass [Member] | SBA PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	0			0		35,164,000
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,507,000			2,507,000		319,000
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,000			2,000		0
Performing Financial Instruments [Member] | Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	2,300,000			2,300,000		2,400,000
Nonperforming Financial Instruments [Member] | Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	$ 393,000			$ 393,000		$ 394,000