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LOANS AND LEASES (Schedule of Loan Balances by Portfolio Class) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Total loans	$ 4,025,487	$ 3,924,312
Net deferred costs	3,852	3,619
Total loans including net deferred costs	$ 4,029,339	$ 3,927,931
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	$ 599,450	$ 600,891
Residential Portfolio Segment [Member] | Primary Residential Mortgages [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	14.89%	15.31%
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member]
Total loans	$ 62,522	$ 62,191
Total loans including net deferred costs	$ 62,522	$ 62,191
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	1.55%	1.58%
Residential Portfolio Segment [Member] | Multifamily Property [Member]
Total loans	$ 1,129,476	$ 1,135,805
Total loans including net deferred costs	$ 1,129,476	$ 1,135,805
Residential Portfolio Segment [Member] | Multifamily Property [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	28.06%	28.94%
Residential Portfolio Segment [Member] | Junior Lien [Member]
Total loans	$ 7,397	$ 7,418
Residential Portfolio Segment [Member] | Junior Lien [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	0.18%	0.19%
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Property [Member]
Total loans	$ 249,421	$ 261,193
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Property [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	6.20%	6.65%
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member]
Total loans	$ 1,017,505	$ 1,001,918
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	25.28%	25.53%
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Total loans	$ 125	$ 86
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)		0.01%
Consumer and Other Loans [Member]
Total loans	$ 57,415	$ 65,180
Consumer and Other Loans [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	1.43%	1.66%
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member]
Total loans	$ 717,851	$ 616,838
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	17.83%	15.72%
Lease Financing [Member]
Total loans	$ 184,182	$ 172,643
Lease Financing [Member] | Commercial Portfolio Segment [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	4.58%	4.40%
Agricultural Sector [Member]
Total loans	$ 143	$ 149
Agricultural Sector [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)		0.01%

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