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LOANS (Schedule of Loans Outstanding, by Classification) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Total loans	$ 3,704,440	$ 3,312,144
Unallocated Financing Receivables [Member]
Total loans	402	492
Residential Mortgage [Member] | Residential Portfolio Segment [Member]
Total loans	576,356	527,370
Multifamily Property [Member] | Residential Portfolio Segment [Member]
Total loans	1,388,958	1,459,594
Commercial Mortgage [Member] | Commercial Real Estate Portfolio Segment [Member]
Total loans	626,656	551,233
Commercial Loans [Member] | Commercial Portfolio Segment [Member]
Total loans	958,294	636,714
Construction Loans [Member]
Total loans		1,405
Home Equity Lines of Credit [Member] | Residential Portfolio Segment [Member]
Total loans	67,497	65,682
Consumer Loans, Including Home Equity Loans [Member] | Consumer and Other [Member]
Total loans	$ 86,277	$ 69,654
Loans and Finance Receivables [Member]
Total loans (in percent)	100.00%	100.00%
Loans and Finance Receivables [Member] | Unallocated Financing Receivables [Member]
Total loans (in percent)	0.01%	0.01%
Loans and Finance Receivables [Member] | Residential Mortgage [Member] | Residential Portfolio Segment [Member]
Total loans (in percent)	15.56%	15.92%
Loans and Finance Receivables [Member] | Multifamily Property [Member] | Residential Portfolio Segment [Member]
Total loans (in percent)	37.49%	44.07%
Loans and Finance Receivables [Member] | Commercial Mortgage [Member] | Commercial Real Estate Portfolio Segment [Member]
Total loans (in percent)	16.92%	16.65%
Loans and Finance Receivables [Member] | Commercial Loans [Member] | Commercial Portfolio Segment [Member]
Total loans (in percent)	25.87%	19.23%
Loans and Finance Receivables [Member] | Construction Loans [Member]
Total loans (in percent)		0.04%
Loans and Finance Receivables [Member] | Home Equity Lines of Credit [Member] | Residential Portfolio Segment [Member]
Total loans (in percent)	1.82%	1.98%
Loans and Finance Receivables [Member] | Consumer Loans, Including Home Equity Loans [Member] | Consumer and Other [Member]
Total loans (in percent)	2.33%	2.10%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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