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Loans Receivable and Allowance for Loan Losses (Loan Portfolio by Pass Rating) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | $ 2,427,180 | $ 2,203,315
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 2,403,499 | 2,180,116
Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 5,543 | 9,716
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 18,138 | 13,483
Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 241,796 | 248,381
Commercial and Multi-family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,677,668 | 1,606,976
Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 134,769 | 104,996
Commercial Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 311,204 | 177,642
Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 60,973 | 64,638
Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 770 | 682
Originated loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 2,262,844 | 2,010,489
Originated loans [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 2,246,632 | 1,997,449
Originated loans [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 4,613 | 7,179
Originated loans [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 11,599 | 5,861
Originated loans [Member] | Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 209,043 | 212,020
Originated loans [Member] | Residential [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 206,900 | 210,094
Originated loans [Member] | Residential [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,040 | 1,336
Originated loans [Member] | Residential [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,103 | 590
Originated loans [Member] | Commercial and Multi-family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,575,458 | 1,485,286
Originated loans [Member] | Commercial and Multi-family [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,568,159 | 1,478,472
Originated loans [Member] | Commercial and Multi-family [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 2,147 | 4,043
Originated loans [Member] | Commercial and Multi-family [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 5,152 | 2,771
Originated loans [Member] | Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 134,769 | 104,996
Originated loans [Member] | Construction [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 134,769 | 104,996
Originated loans [Member] | Commercial Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 292,709 | 157,413
Originated loans [Member] | Commercial Business [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 286,650 | 153,464
Originated loans [Member] | Commercial Business [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,426 | 1,796
Originated loans [Member] | Commercial Business [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 4,633 | 2,153
Originated loans [Member] | Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 50,097 | 50,100
Originated loans [Member] | Home Equity [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 49,386 | 49,753
Originated loans [Member] | Home Equity [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 711 | 347
Originated loans [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 768 | 674
Originated loans [Member] | Consumer [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 768 | 670
Originated loans [Member] | Consumer [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross |  | 4
Acquired loans recorded at fair value [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 161,186 | 187,216
Acquired loans recorded at fair value [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 155,382 | 181,680
Acquired loans recorded at fair value [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 337 | 1,742
Acquired loans recorded at fair value [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 5,467 | 3,794
Acquired loans recorded at fair value [Member] | Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 31,434 | 35,010
Acquired loans recorded at fair value [Member] | Residential [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 30,777 | 34,624
Acquired loans recorded at fair value [Member] | Residential [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 657 | 386
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 101,515 | 118,577
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 97,894 | 115,130
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 205 | 583
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 3,416 | 2,864
Acquired loans recorded at fair value [Member] | Commercial Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 17,589 | 19,319
Acquired loans recorded at fair value [Member] | Commercial Business [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 16,132 | 17,648
Acquired loans recorded at fair value [Member] | Commercial Business [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 132 | 1,159
Acquired loans recorded at fair value [Member] | Commercial Business [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,325 | 512
Acquired loans recorded at fair value [Member] | Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 10,646 | 14,302
Acquired loans recorded at fair value [Member] | Home Equity [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 10,577 | 14,270
Acquired loans recorded at fair value [Member] | Home Equity [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 69 | 32
Acquired loans recorded at fair value [Member] | Consumer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 2 | 8
Acquired loans recorded at fair value [Member] | Consumer [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 2 | 8
Acquired loans with deteriorated credit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 3,150 | 5,610
Acquired loans with deteriorated credit [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,485 | 987
Acquired loans with deteriorated credit [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 593 | 795
Acquired loans with deteriorated credit [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,072 | 3,828
Acquired loans with deteriorated credit [Member] | Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 1,319 | 1,351
Acquired loans with deteriorated credit [Member] | Residential [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 768 | 788
Acquired loans with deteriorated credit [Member] | Residential [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 544 | 248
Acquired loans with deteriorated credit [Member] | Residential [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 7 | 315
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 695 | 3,113
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 487 |
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross |  | 493
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 208 | 2,620
Acquired loans with deteriorated credit [Member] | Commercial Business [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 906 | 910
Acquired loans with deteriorated credit [Member] | Commercial Business [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 49 | 54
Acquired loans with deteriorated credit [Member] | Commercial Business [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 857 | 856
Acquired loans with deteriorated credit [Member] | Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | 230 | 236
Acquired loans with deteriorated credit [Member] | Home Equity [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross | $ 230 | 199
Acquired loans with deteriorated credit [Member] | Home Equity [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, gross |  | $ 37

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