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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, 2025	Dec. 31, 2024
Total loans	$ 6,016,820	$ 5,510,956
Total loans including net deferred costs	$ 6,018,967	$ 5,512,326
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	$ 6,016,820	$ 5,510,956
Net deferred costs	2,147	1,370
Total loans including net deferred costs	6,018,967	5,512,326
Construction [Member]
Total loans	25,322	11,204
Construction [Member] | Current Expected Credit Loss Methodology [Member]
Total loans	$ 25,322	$ 11,204
Construction [Member] | Current Expected Credit Loss Methodology [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	0.42%	0.20%
Residential Portfolio Segment [Member] | Primary Residential Mortgages [Member]
Total loans	$ 633,980	$ 609,038
Residential Portfolio Segment [Member] | Primary Residential Mortgages [Member] | Current Expected Credit Loss Methodology [Member]
Total loans	$ 633,980	$ 609,038
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)	10.54%	11.05%
Residential Portfolio Segment [Member] | Multifamily Property [Member]
Total loans	$ 1,796,533	$ 1,799,754
Total loans including net deferred costs	1,796,533	1,799,754
Residential Portfolio Segment [Member] | Multifamily Property [Member] | Current Expected Credit Loss Methodology [Member]
Total loans	$ 1,796,533	$ 1,799,754
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)	29.86%	32.66%
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member]
Total loans including net deferred costs	$ 57,166	$ 42,327
Residential Portfolio Segment [Member] | Junior Lien [Member]
Total loans	59,591	45,307
Residential Portfolio Segment [Member] | Junior Lien [Member] | Current Expected Credit Loss Methodology [Member]
Total loans	$ 59,591	$ 45,307
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)	0.99%	0.82%
Commercial Real Estate Portfolio Segment [Member] | Current Expected Credit Loss Methodology [Member]
Total loans	$ 277,652	$ 275,089
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)	4.61%	4.99%
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Property [Member]
Total loans	$ 277,652	$ 275,089
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member]
Total loans	1,035,737	978,436
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member] | Current Expected Credit Loss Methodology [Member]
Total loans	$ 1,035,737	$ 978,436
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)	17.21%	17.75%
Commercial Portfolio Segment [Member] | Construction [Member]
Total loans	$ 25,322	$ 11,204
Consumer and Other [Member]
Total loans	174,294	80,165
Consumer and Other [Member] | Current Expected Credit Loss Methodology [Member]
Total loans	$ 174,294	$ 80,165
Consumer and Other [Member] | Current Expected Credit Loss Methodology [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	2.90%	1.46%
Commercial and Industrial [Member] | Current Expected Credit Loss Methodology [Member]
Total loans	$ 1,748,015	$ 1,489,466
Commercial and Industrial [Member] | Current Expected Credit Loss Methodology [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	29.05%	27.03%
Commercial and Industrial [Member] | Commercial Portfolio Segment [Member]
Total loans	$ 1,748,015	$ 1,489,466
Lease Financing [Member]
Total loans	265,696	222,497
Lease Financing [Member] | Current Expected Credit Loss Methodology [Member]
Total loans	$ 265,696	$ 222,497
Lease Financing [Member] | Current Expected Credit Loss Methodology [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	4.42%	4.04%

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