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LOANS AND LEASES (Schedule of Loan Balances by Portfolio Class) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Total loans	$ 4,403,045	$ 4,389,641
Net deferred costs	4,960	4,496
Total loans including net deferred costs	$ 4,408,005	$ 4,394,137
Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	100.00%	100.00%
Residential Portfolio Segment [Member] | Primary Residential Mortgages [Member]
Total loans	$ 557,053	$ 578,306
Residential Portfolio Segment [Member] | Primary Residential Mortgages [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	12.65%	13.17%
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member]
Total loans	$ 55,856	$ 57,248
Total loans including net deferred costs	$ 55,856	$ 57,248
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	1.27%	1.30%
Residential Portfolio Segment [Member] | Multifamily Property [Member]
Total loans	$ 1,203,487	$ 1,210,003
Total loans including net deferred costs	$ 1,203,487	$ 1,210,003
Residential Portfolio Segment [Member] | Multifamily Property [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	27.33%	27.56%
Residential Portfolio Segment [Member] | Junior Lien [Member]
Total loans	$ 6,817	$ 7,011
Residential Portfolio Segment [Member] | Junior Lien [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	0.16%	0.16%
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Property [Member]
Total loans	$ 251,293	$ 249,419
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Property [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	5.71%	5.68%
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member]
Total loans	$ 1,092,294	$ 1,095,182
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	24.81%	24.95%
Commercial Portfolio Segment [Member] | Construction [Member]
Total loans	$ 3,137	$ 5,520
Total loans including net deferred costs	$ 2,934	$ 5,306
Commercial Portfolio Segment [Member] | Construction [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	0.07%	0.13%
Consumer and Other Loans [Member]
Total loans	$ 56,998	$ 58,213
Consumer and Other Loans [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	1.29%	1.33%
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member]
Total loans	$ 904,949	$ 867,295
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	20.55%	19.76%
Lease Financing [Member]
Total loans	$ 268,436	$ 258,401
Lease Financing [Member] | Commercial Portfolio Segment [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	6.10%	5.89%
Agricultural Sector [Member]
Total loans	$ 2,725	$ 3,043
Agricultural Sector [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	0.06%	0.07%

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