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LOANS AND LEASES (Schedule of Loans Outstanding, by Type of Loan) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Total loans |  | $ 4,575,398 | $ 4,372,437
Loans and Finance Receivables, Gross [Member] | Credit Concentration Risk [Member] |  |  |
Total loans (in percent) |  | 100.00% | 100.00%
Unallocated Financing Receivables [Member] |  |  |
Total loans |  | $ 245 | $ 226
Unallocated Financing Receivables [Member] | Loans and Finance Receivables, Gross [Member] | Credit Concentration Risk [Member] |  |  |
Total loans (in percent) |  | 0.01% | 0.01%
Residential Mortgage [Member] | Residential Portfolio Segment [Member] |  |  |
Total loans |  | $ 507,865 | $ 502,829
Residential Mortgage [Member] | Residential Portfolio Segment [Member] | Loans and Finance Receivables, Gross [Member] | Credit Concentration Risk [Member] |  |  |
Total loans (in percent) |  | 11.10% | 11.50%
Multifamily Property [Member] | Residential Portfolio Segment [Member] |  |  |
Total loans |  | $ 1,497,683 | $ 1,126,946
Multifamily Property [Member] | Residential Portfolio Segment [Member] | Loans and Finance Receivables, Gross [Member] | Credit Concentration Risk [Member] |  |  |
Total loans (in percent) |  | 32.73% | 25.77%
Commercial Mortgage [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Total loans |  | $ 680,107 | $ 691,294
Commercial Mortgage [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans and Finance Receivables, Gross [Member] | Credit Concentration Risk [Member] |  |  |
Total loans (in percent) |  | 14.87% | 15.81%
Commercial Loans Including Equipment Financing [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Total loans | [1] | $ 1,790,579 | $ 1,950,981
Commercial Loans Including Equipment Financing [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans and Finance Receivables, Gross [Member] | Credit Concentration Risk [Member] |  |  |
Total loans (in percent) | [1] | 39.13% | 44.62%
Construction [Member] | Commercial Portfolio Segment [Member] |  |  |
Total loans |  | $ 25,718 | $ 12,600
Construction [Member] | Commercial Portfolio Segment [Member] | Loans and Finance Receivables, Gross [Member] | Credit Concentration Risk [Member] |  |  |
Total loans (in percent) |  | 0.56% | 0.29%
Home Equity Lines of Credit [Member] | Residential Portfolio Segment [Member] |  |  |
Total loans |  | $ 42,512 | $ 50,545
Home Equity Lines of Credit [Member] | Residential Portfolio Segment [Member] | Loans and Finance Receivables, Gross [Member] | Credit Concentration Risk [Member] |  |  |
Total loans (in percent) |  | 0.93% | 1.15%
Consumer Loans, Including Home Equity Loans [Member] | Consumer and Other Loans [Member] |  |  |
Total loans |  | $ 30,689 | $ 37,016
Consumer Loans, Including Home Equity Loans [Member] | Consumer and Other Loans [Member] | Loans and Finance Receivables, Gross [Member] | Credit Concentration Risk [Member] |  |  |
Total loans (in percent) |  | 0.67% | 0.85%
[1] | Includes PPP loans of $49 million at September 30, 2021 and $196 million at December 31, 2020.

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