LOANS AND LEASES (Schedule of Loan Balances by Pool Segment and Portfolio Class) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2023	Dec. 31, 2022
Total loans	$ 5,483,160	$ 5,281,581
Total loans including net deferred costs	$ 5,486,721	$ 5,285,246
Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	100.00%	100.00%
Current Expected Credit Loss Methodology [Member]
Total loans	$ 5,483,160	$ 5,281,581
Net deferred costs	3,561	3,665
Total loans including net deferred costs	5,486,721	5,285,246
Construction [Member]
Total loans	21,328	9,936
Construction [Member] \| Current Expected Credit Loss Methodology [Member]
Total loans	$ 21,328	$ 9,936
Construction [Member] \| Current Expected Credit Loss Methodology [Member] \| Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	0.39%	0.19%
Residential Portfolio Segment [Member]
Total loans	$ 38,084
Residential Portfolio Segment [Member] \| Primary Residential Mortgages [Member]
Total loans	585,753	$ 527,784
Residential Portfolio Segment [Member] \| Primary Residential Mortgages [Member] \| Current Expected Credit Loss Methodology [Member]
Total loans	$ 585,753	$ 527,784
Residential Portfolio Segment [Member] \| Primary Residential Mortgages [Member] \| Current Expected Credit Loss Methodology [Member] \| Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	10.68%	9.99%
Residential Portfolio Segment [Member] \| Multifamily Property [Member]
Total loans	$ 1,871,853	$ 1,863,915
Total loans including net deferred costs	1,871,853	1,863,915
Residential Portfolio Segment [Member] \| Multifamily Property [Member] \| Current Expected Credit Loss Methodology [Member]
Total loans	$ 1,871,853	$ 1,863,915
Residential Portfolio Segment [Member] \| Multifamily Property [Member] \| Current Expected Credit Loss Methodology [Member] \| Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	34.14%	35.29%
Residential Portfolio Segment [Member] \| Home Equity Lines of Credit [Member]
Total loans including net deferred costs	$ 34,411	$ 34,496
Residential Portfolio Segment [Member] \| Junior Lien [Member]
Total loans	38,084	38,265
Residential Portfolio Segment [Member] \| Junior Lien [Member] \| Current Expected Credit Loss Methodology [Member]
Total loans	$ 38,084	$ 38,265
Residential Portfolio Segment [Member] \| Junior Lien [Member] \| Current Expected Credit Loss Methodology [Member] \| Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	0.69%	0.73%
Commercial Real Estate Portfolio Segment [Member] \| Current Expected Credit Loss Methodology [Member]
Total loans	$ 259,304	$ 272,009
Commercial Real Estate Portfolio Segment [Member] \| Current Expected Credit Loss Methodology [Member] \| Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	4.73%	5.15%
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied Property [Member]
Total loans	$ 259,304	$ 272,009
Commercial Real Estate Portfolio Segment [Member] \| Investment Property [Member]
Total loans	1,050,295	1,044,125
Commercial Real Estate Portfolio Segment [Member] \| Investment Property [Member] \| Current Expected Credit Loss Methodology [Member]
Total loans	$ 1,050,295	$ 1,044,125
Commercial Real Estate Portfolio Segment [Member] \| Investment Property [Member] \| Current Expected Credit Loss Methodology [Member] \| Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	19.15%	19.77%
Commercial Portfolio Segment [Member] \| Construction [Member]
Total loans	$ 21,328	$ 9,936
Total loans including net deferred costs	14,803	4,042
Consumer and Other [Member]
Total loans	60,048	42,319
Consumer and Other [Member] \| Current Expected Credit Loss Methodology [Member]
Total loans	$ 60,048	$ 42,319
Consumer and Other [Member] \| Current Expected Credit Loss Methodology [Member] \| Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	1.10%	0.80%
Commercial and Industrial [Member] \| Current Expected Credit Loss Methodology [Member]
Total loans	$ 1,333,811	$ 1,194,662
Commercial and Industrial [Member] \| Current Expected Credit Loss Methodology [Member] \| Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	24.33%	22.62%
Commercial and Industrial [Member] \| Commercial Portfolio Segment [Member]
Total loans	$ 1,333,811	$ 1,194,662
Lease Financing [Member]
Total loans	262,684	288,566
Lease Financing [Member] \| Current Expected Credit Loss Methodology [Member]
Total loans	$ 262,684	$ 288,566
Lease Financing [Member] \| Current Expected Credit Loss Methodology [Member] \| Customer Concentration Risk [Member] \| Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	4.79%	5.46%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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