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Loans Receivable and Allowance for Loan Losses (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | $ 28,842 | $ 23,789 | $ 23,734 | $ 22,359 |
Allowance for loan losses: Charge-offs |  | 1 | 4 | 257 |
Allowance for loan losses: Recoveries |  | 3 | 504 | 45 |
Allowance for loan losses: Provisions | 2,726 | 900 | 7,526 | 2,544 |
Allowance for loan losses: Ending Balance | 31,760 | 24,691 | 31,760 | 24,691 |
Allowance for loan losses: Ending balance: individually evaluated for impairment | 3,853 |  | 3,853 |  | $ 3,264
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 27,907 |  | 27,907 |  | 20,470
Loans receivables: Ending balance: individually evaluated for impairment | 31,318 |  | 31,318 |  | 26,912
Loans receivables: Ending balance: collectively evaluated for impairment | 2,395,862 |  | 2,395,862 |  | 2,176,403
Loans receivables: Ending balance | 2,427,180 |  | 2,427,180 |  | 2,203,315
Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 3,076 | 3,457 | 2,722 | 2,748 |
Allowance for loan losses: Charge-offs |  | 1 | 4 | 1 |
Allowance for loan losses: Recoveries |  |  |  | 3 |
Allowance for loan losses: Provisions | 58 | (567) | 416 | 139 |
Allowance for loan losses: Ending Balance | 3,134 | 2,889 | 3,134 | 2,889 |
Allowance for loan losses: Ending balance: individually evaluated for impairment | 385 |  | 385 |  | 380
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 2,749 |  | 2,749 |  | 2,342
Loans receivables: Ending balance: individually evaluated for impairment | 8,533 |  | 8,533 |  | 8,455
Loans receivables: Ending balance: collectively evaluated for impairment | 233,263 |  | 233,263 |  | 239,926
Loans receivables: Ending balance | 241,796 |  | 241,796 |  | 248,381
Commercial and Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 16,942 | 14,388 | 15,372 | 14,168 |
Allowance for loan losses: Charge-offs |  |  |  | 111 |
Allowance for loan losses: Recoveries |  |  |  | 10 |
Allowance for loan losses: Provisions | 1,731 | 556 | 3,301 | 877 |
Allowance for loan losses: Ending Balance | 18,673 | 14,944 | 18,673 | 14,944 |
Allowance for loan losses: Ending balance: individually evaluated for impairment | 313 |  | 313 |  | 342
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 18,360 |  | 18,360 |  | 15,030
Loans receivables: Ending balance: individually evaluated for impairment | 13,980 |  | 13,980 |  | 13,231
Loans receivables: Ending balance: collectively evaluated for impairment | 1,663,688 |  | 1,663,688 |  | 1,593,745
Loans receivables: Ending balance | 1,677,668 |  | 1,677,668 |  | 1,606,976
Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 1,334 | 1,454 | 1,244 | 1,003 |
Allowance for loan losses: Provisions | 395 | 83 | 485 | 534 |
Allowance for loan losses: Ending Balance | 1,729 | 1,537 | 1,729 | 1,537 |
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 1,729 |  | 1,729 |  | 1,244
Loans receivables: Ending balance: collectively evaluated for impairment | 134,769 |  | 134,769 |  | 104,996
Loans receivables: Ending balance | 134,769 |  | 134,769 |  | 104,996
Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 4,311 | 4,062 | 3,790 | 3,933 |
Allowance for loan losses: Charge-offs |  |  |  | 145 |
Allowance for loan losses: Recoveries |  |  | 492 | 18 |
Allowance for loan losses: Provisions | 2,891 | 597 | 3,110 | 853 |
Allowance for loan losses: Ending Balance | 7,392 | 4,659 | 7,392 | 4,659 |
Allowance for loan losses: Ending balance: individually evaluated for impairment | 3,128 |  | 3,128 |  | 2,518
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 4,264 |  | 4,264 |  | 1,272
Loans receivables: Ending balance: individually evaluated for impairment | 7,163 |  | 7,163 |  | 3,938
Loans receivables: Ending balance: collectively evaluated for impairment | 304,041 |  | 304,041 |  | 173,704
Loans receivables: Ending balance | 311,204 |  | 311,204 |  | 177,642
Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 684 | 277 | 333 | 316 |
Allowance for loan losses: Recoveries |  | 3 | 8 | 14 |
Allowance for loan losses: Provisions | (63) | 24 | 282 | (26) |
Allowance for loan losses: Ending Balance | 623 | 304 | 623 | 304 |
Allowance for loan losses: Ending balance: individually evaluated for impairment | 27 |  | 27 |  | 24
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 596 |  | 596 |  | 309
Loans receivables: Ending balance: individually evaluated for impairment | 1,642 |  | 1,642 |  | 1,288
Loans receivables: Ending balance: collectively evaluated for impairment | 59,331 |  | 59,331 |  | 63,350
Loans receivables: Ending balance | 60,973 |  | 60,973 |  | 64,638
Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 6 | 1 |  | 2 |
Allowance for loan losses: Recoveries |  |  | 4 |  |
Allowance for loan losses: Provisions | 6 | (1) | 8 | (2) |
Allowance for loan losses: Ending Balance | 12 |  | 12 |  |
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 12 |  | 12 |  |
Loans receivables: Ending balance: collectively evaluated for impairment | 770 |  | 770 |  | 682
Loans receivables: Ending balance | 770 |  | 770 |  | 682
Unallocated [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 2,489 | 150 | 273 | 189 |
Allowance for loan losses: Provisions | (2,292) | 208 | (76) | 169 |
Allowance for loan losses: Ending Balance | 197 | 358 | 197 | 358 |
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 197 |  | 197 |  | 273
Originated loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 27,013 | 22,705 | 22,449 | 21,750 |
Allowance for loan losses: Charge-offs |  | 1 |  | 257 |
Allowance for loan losses: Recoveries | 187 |  | 493 | 15 |
Allowance for loan losses: Provisions | 1,989 | 552 | 6,247 | 1,748 |
Allowance for loan losses: Ending Balance | 29,189 | 23,256 | 29,189 | 23,256 |
Loans receivables: Ending balance | 2,262,844 |  | 2,262,844 |  | 2,010,489
Originated loans [Member] | Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 2,649 | 2,580 | 2,422 | 2,374 |
Allowance for loan losses: Charge-offs |  | 1 |  | 1 |
Allowance for loan losses: Provisions | 33 | (145) | 260 | 61 |
Allowance for loan losses: Ending Balance | 2,682 | 2,434 | 2,682 | 2,434 |
Loans receivables: Ending balance | 209,043 |  | 209,043 |  | 212,020
Originated loans [Member] | Commercial and Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 16,697 | 14,251 | 15,235 | 14,000 |
Allowance for loan losses: Charge-offs |  |  |  | 111 |
Allowance for loan losses: Provisions | 1,148 | 421 | 2,610 | 783 |
Allowance for loan losses: Ending Balance | 17,845 | 14,672 | 17,845 | 14,672 |
Loans receivables: Ending balance | 1,575,458 |  | 1,575,458 |  | 1,485,286
Originated loans [Member] | Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 1,334 | 1,454 | 1,244 | 1,003 |
Allowance for loan losses: Provisions | 395 | 83 | 485 | 534 |
Allowance for loan losses: Ending Balance | 1,729 | 1,537 | 1,729 | 1,537 |
Loans receivables: Ending balance | 134,769 |  | 134,769 |  | 104,996
Originated loans [Member] | Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 3,158 | 3,995 | 2,945 | 3,869 |
Allowance for loan losses: Charge-offs |  |  |  | 145 |
Allowance for loan losses: Recoveries | 187 |  | 489 | 15 |
Allowance for loan losses: Provisions | 2,759 | (29) | 2,670 | 227 |
Allowance for loan losses: Ending Balance | 6,104 | 3,966 | 6,104 | 3,966 |
Loans receivables: Ending balance | 292,709 |  | 292,709 |  | 157,413
Originated loans [Member] | Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 680 | 274 | 330 | 313 |
Allowance for loan losses: Provisions | (60) | 15 | 290 | (24) |
Allowance for loan losses: Ending Balance | 620 | 289 | 620 | 289 |
Loans receivables: Ending balance | 50,097 |  | 50,097 |  | 50,100
Originated loans [Member] | Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 6 | 1 |  | 2 |
Allowance for loan losses: Recoveries |  |  | 4 |  |
Allowance for loan losses: Provisions | 6 | (1) | 8 | (2) |
Allowance for loan losses: Ending Balance | 12 |  | 12 |  |
Loans receivables: Ending balance | 768 |  | 768 |  | 674
Originated loans [Member] | Unallocated [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 2,489 | 150 | 273 | 189 |
Allowance for loan losses: Provisions | (2,292) | 208 | (76) | 169 |
Allowance for loan losses: Ending Balance | 197 | 358 | 197 | 358 |
Acquired loans recorded at fair value [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 1,727 | 731 | 1,122 | 335 |
Allowance for loan losses: Charge-offs |  |  | 4 |  |
Allowance for loan losses: Recoveries | 5 | 3 | 11 | 30 |
Allowance for loan losses: Provisions | 743 | 432 | 1,346 | 801 |
Allowance for loan losses: Ending Balance | 2,475 | 1,166 | 2,475 | 1,166 |
Loans receivables: Ending balance | 161,186 |  | 161,186 |  | 187,216
Acquired loans recorded at fair value [Member] | Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 391 | 731 | 261 | 335 |
Allowance for loan losses: Charge-offs |  |  | 4 |  |
Allowance for loan losses: Recoveries |  |  |  | 3 |
Allowance for loan losses: Provisions | 28 | (316) | 162 | 77 |
Allowance for loan losses: Ending Balance | 419 | 415 | 419 | 415 |
Loans receivables: Ending balance | 31,434 |  | 31,434 |  | 35,010
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 226 |  | 58 |  |
Allowance for loan losses: Recoveries |  |  |  | 10 |
Allowance for loan losses: Provisions | 583 | 112 | 751 | 102 |
Allowance for loan losses: Ending Balance | 809 | 112 | 809 | 112 |
Loans receivables: Ending balance | 101,515 |  | 101,515 |  | 118,577
Acquired loans recorded at fair value [Member] | Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 1,110 |  | 803 |  |
Allowance for loan losses: Recoveries | 3 |  | 3 | 3 |
Allowance for loan losses: Provisions | 134 | 627 | 441 | 624 |
Allowance for loan losses: Ending Balance | 1,247 | 627 | 1,247 | 627 |
Loans receivables: Ending balance | 17,589 |  | 17,589 |  | 19,319
Acquired loans recorded at fair value [Member] | Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Recoveries | 2 | 3 | 8 | 14 |
Allowance for loan losses: Provisions | (2) | 9 | (8) | (2) |
Allowance for loan losses: Ending Balance |  | 12 |  | 12 |
Loans receivables: Ending balance | 10,646 |  | 10,646 |  | 14,302
Acquired loans recorded at fair value [Member] | Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivables: Ending balance | 2 |  | 2 |  | 8
Acquired loans with deteriorated credit [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 102 | 353 | 163 | 274 |
Allowance for loan losses: Recoveries | 192 |  |  |  |
Allowance for loan losses: Provisions | (6) | (84) | (67) | (5) |
Allowance for loan losses: Ending Balance | 96 | 269 | 96 | 269 |
Loans receivables: Ending balance | 3,150 |  | 3,150 |  | 5,610
Acquired loans with deteriorated credit [Member] | Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 36 | 146 | 39 | 39 |
Allowance for loan losses: Provisions | (3) | (106) | (6) | 1 |
Allowance for loan losses: Ending Balance | 33 | 40 | 33 | 40 |
Loans receivables: Ending balance | 1,319 |  | 1,319 |  | 1,351
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 19 | 137 | 79 | 168 |
Allowance for loan losses: Provisions |  | 23 | (60) | (8) |
Allowance for loan losses: Ending Balance | 19 | 160 | 19 | 160 |
Loans receivables: Ending balance | 695 |  | 695 |  | 3,113
Acquired loans with deteriorated credit [Member] | Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 43 | 67 | 42 | 64 |
Allowance for loan losses: Recoveries | 190 |  |  |  |
Allowance for loan losses: Provisions | (2) | (1) | (1) | 2 |
Allowance for loan losses: Ending Balance | 41 | 66 | 41 | 66 |
Loans receivables: Ending balance | 906 |  | 906 |  | 910
Acquired loans with deteriorated credit [Member] | Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 4 | 3 | 3 | 3 |
Allowance for loan losses: Recoveries | 2 |  |  |  |
Allowance for loan losses: Provisions | (1) |  |  |  |
Allowance for loan losses: Ending Balance | 3 | $ 3 | 3 | $ 3 |
Loans receivables: Ending balance | $ 230 |  | $ 230 |  | $ 236

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