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LOANS (Schedule of Loan Balances by Portfolio Class) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Total loans	$ 3,719,987	$ 3,702,532
Net deferred costs	2,918	1,908
Total loans including net deferred costs	$ 3,722,905	$ 3,704,440
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	$ 595,086	$ 605,569
Residential Portfolio Segment [Member] | Primary Residential Mortgages [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	16.00%	16.35%
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member]
Total loans	$ 55,020	$ 67,497
Total loans including net deferred costs	$ 55,020	$ 67,497
Residential Portfolio Segment [Member] | Home Equity Lines of Credit [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	1.48%	1.82%
Residential Portfolio Segment [Member] | Multifamily Property [Member]
Total loans	$ 1,320,251	$ 1,388,958
Total loans including net deferred costs	$ 1,320,251	$ 1,388,958
Residential Portfolio Segment [Member] | Multifamily Property [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	35.49%	37.51%
Residential Portfolio Segment [Member] | Junior Lien [Member]
Total loans	$ 7,669	$ 7,073
Residential Portfolio Segment [Member] | Junior Lien [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	0.21%	0.19%
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Property [Member]
Total loans	$ 253,520	$ 253,492
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Property [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	6.82%	6.85%
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member]
Total loans	$ 892,526	$ 874,098
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	23.99%	23.61%
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Total loans	$ 90	$ 92
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	$ 69,330	$ 99,247
Consumer and Other Loans [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	1.86%	2.68%
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member]
Total loans	$ 399,828	$ 316,294
Commercial and Industrial Sector [Member] | Commercial Portfolio Segment [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	10.75%	8.54%
Lease Financing [Member]
Total loans	$ 126,514	$ 90,052
Lease Financing [Member] | Commercial Portfolio Segment [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)	3.40%	2.43%
Agricultural Sector [Member]
Total loans	$ 153	$ 160
Agricultural Sector [Member] | Customer Concentration Risk [Member] | Loans and Finance Receivables, Gross [Member]
Total loans (in percent)		0.01%

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