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Loans Receivable and Allowance for Loan Losses (Loan Portfolio by Pass Rating) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 2,333,263 | $ 2,330,018 | $ 2,190,677
Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 2,235,899 | 2,256,702 |
Special Mention [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 41,186 | 4,736 |
Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 56,178 | 68,580 |
Residential [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 234,375 | 244,369 | 268,137
Commercial & Multi-family [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 1,700,113 | 1,690,836 | 1,577,816
Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 167,224 | 155,967 | 101,692
Commercial Business [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 177,340 | 184,357 | 177,146
Home Equity [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 53,360 | 53,667 | 64,857
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 851 | 822 | $ 1,029
Originated loans [Member] | Residential [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 234,375 | 244,369 |
Originated loans [Member] | Residential [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 232,669 | 241,237 |
Originated loans [Member] | Residential [Member] | Special Mention [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 724 | 1,087 |
Originated loans [Member] | Residential [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 982 | 2,045 |
Originated loans [Member] | Commercial & Multi-family [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 1,700,113 | 1,690,836 |
Originated loans [Member] | Commercial & Multi-family [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 1,622,917 | 1,631,838 |
Originated loans [Member] | Commercial & Multi-family [Member] | Special Mention [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 38,464 | 2,152 |
Originated loans [Member] | Commercial & Multi-family [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 38,732 | 56,846 |
Originated loans [Member] | Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 167,224 | 155,967 |
Originated loans [Member] | Construction [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 164,437 | 155,967 |
Originated loans [Member] | Construction [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 2,787 |  |
Originated loans [Member] | Commercial Business [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 177,340 | 184,357 |
Originated loans [Member] | Commercial Business [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 162,408 | 173,833 |
Originated loans [Member] | Commercial Business [Member] | Special Mention [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 1,998 | 1,497 |
Originated loans [Member] | Commercial Business [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 12,934 | 9,027 |
Originated loans [Member] | Home Equity [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 53,360 | 53,667 |
Originated loans [Member] | Home Equity [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 52,617 | 53,005 |
Originated loans [Member] | Home Equity [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 743 | 662 |
Originated loans [Member] | Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | 851 | 822 |
Originated loans [Member] | Consumer [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans receivable, gross | $ 851 | $ 822 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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