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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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