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Loans Receivable and Allowance for Loan Losses (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | $ 25,534 | $ 23,004 | $ 23,734 | $ 22,359 | $ 22,359
Allowance for loan losses: Charge-offs |  |  | 4 | 256 | 743
Allowance for loan losses: Recoveries |  | 30 | 312 | 42 | 49
Allowance for loan losses: Provisions | 3,300 | 755 | 4,800 | 1,644 | 2,069
Allowance for loan losses: Ending Balance | 28,842 | 23,789 | 28,842 | 23,789 | 23,734
Allowance for loan losses: Ending balance: individually evaluated for impairment | 3,401 |  | 3,401 |  | 3,264
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 25,441 |  | 25,441 |  | 20,470
Loans receivables: Ending balance: individually evaluated for impairment | 26,838 |  | 26,838 |  | 26,912
Loans receivables: Ending balance: collectively evaluated for impairment | 2,349,418 |  | 2,349,418 |  | 2,176,403
Loans receivables: Ending balance | 2,376,256 |  | 2,376,256 |  | 2,203,315
Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 3,131 | 2,907 | 2,722 | 2,748 | 2,748
Allowance for loan losses: Charge-offs |  |  | 4 |  | 66
Allowance for loan losses: Recoveries |  | 3 |  | 3 | 3
Allowance for loan losses: Provisions | (55) | 547 | 358 | 706 | 37
Allowance for loan losses: Ending Balance | 3,076 | 3,457 | 3,076 | 3,457 | 2,722
Allowance for loan losses: Ending balance: individually evaluated for impairment | 398 |  | 398 |  | 380
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 2,678 |  | 2,678 |  | 2,342
Loans receivables: Ending balance: individually evaluated for impairment | 8,233 |  | 8,233 |  | 8,455
Loans receivables: Ending balance: collectively evaluated for impairment | 239,238 |  | 239,238 |  | 239,926
Loans receivables: Ending balance | 247,471 |  | 247,471 |  | 248,381
Commercial and Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 14,949 | 15,221 | 15,372 | 14,168 | 14,168
Allowance for loan losses: Charge-offs |  |  |  | 111 | 229
Allowance for loan losses: Recoveries |  |  |  | 10 | 10
Allowance for loan losses: Provisions | 1,993 | (833) | 1,570 | 321 | 1,423
Allowance for loan losses: Ending Balance | 16,942 | 14,388 | 16,942 | 14,388 | 15,372
Allowance for loan losses: Ending balance: individually evaluated for impairment | 318 |  | 318 |  | 342
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 16,624 |  | 16,624 |  | 15,030
Loans receivables: Ending balance: individually evaluated for impairment | 9,725 |  | 9,725 |  | 13,231
Loans receivables: Ending balance: collectively evaluated for impairment | 1,634,229 |  | 1,634,229 |  | 1,593,745
Loans receivables: Ending balance | 1,643,954 |  | 1,643,954 |  | 1,606,976
Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 1,105 | 1,209 | 1,244 | 1,003 | 1,003
Allowance for loan losses: Provisions | 229 | 235 | 90 | 451 | 241
Allowance for loan losses: Ending Balance | 1,334 | 1,454 | 1,334 | 1,454 | 1,244
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 1,334 |  | 1,334 |  | 1,244
Loans receivables: Ending balance: collectively evaluated for impairment | 111,463 |  | 111,463 |  | 104,996
Loans receivables: Ending balance | 111,463 |  | 111,463 |  | 104,996
Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 3,957 | 3,367 | 3,790 | 3,933 | 3,933
Allowance for loan losses: Charge-offs |  |  |  | 145 | 448
Allowance for loan losses: Recoveries |  | 9 | 302 | 18 | 20
Allowance for loan losses: Provisions | 354 | 686 | 219 | 256 | 285
Allowance for loan losses: Ending Balance | 4,311 | 4,062 | 4,311 | 4,062 | 3,790
Allowance for loan losses: Ending balance: individually evaluated for impairment | 2,665 |  | 2,665 |  | 2,518
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 1,646 |  | 1,646 |  | 1,272
Loans receivables: Ending balance: individually evaluated for impairment | 7,255 |  | 7,255 |  | 3,938
Loans receivables: Ending balance: collectively evaluated for impairment | 302,029 |  | 302,029 |  | 173,704
Loans receivables: Ending balance | 309,284 |  | 309,284 |  | 177,642
Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 625 | 268 | 333 | 316 | 316
Allowance for loan losses: Recoveries |  | 8 | 6 | 11 | 16
Allowance for loan losses: Provisions | 55 | 1 | 345 | (50) | 1
Allowance for loan losses: Ending Balance | 684 | 277 | 684 | 277 | 333
Allowance for loan losses: Ending balance: individually evaluated for impairment | 20 |  | 20 |  | 24
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 664 |  | 664 |  | 309
Loans receivables: Ending balance: individually evaluated for impairment | 1,625 |  | 1,625 |  | 1,288
Loans receivables: Ending balance: collectively evaluated for impairment | 61,856 |  | 61,856 |  | 63,350
Loans receivables: Ending balance | 63,481 |  | 63,481 |  | 64,638
Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 5 |  |  | 2 | 2
Allowance for loan losses: Recoveries |  |  | 4 |  |
Allowance for loan losses: Provisions | (3) | 1 | 2 | (1) | (2)
Allowance for loan losses: Ending Balance | 6 | 1 | 6 | 1 |
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 6 |  | 6 |  |
Loans receivables: Ending balance: collectively evaluated for impairment | 603 |  | 603 |  | 682
Loans receivables: Ending balance | 603 |  | 603 |  | 682
Unallocated [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 1,762 | 32 | 273 | 189 | 189
Allowance for loan losses: Provisions | 727 | 118 | 2,216 | (39) | 84
Allowance for loan losses: Ending Balance | 2,489 | 150 | 2,489 | 150 | 273
Allowance for loan losses: Ending balance: collectively evaluated for impairment | 2,489 |  | 2,489 |  | 273
Originated loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 24,151 | 22,382 | 22,449 | 21,750 | 21,750
Allowance for loan losses: Charge-offs |  |  |  | 256 | 257
Allowance for loan losses: Recoveries | 4 | 7 | 306 | 15 | 15
Allowance for loan losses: Provisions | 2,858 | 316 | 4,258 | 1,196 | 941
Allowance for loan losses: Ending Balance | 27,013 | 22,705 | 27,013 | 22,705 | 22,449
Loans receivables: Ending balance | 2,199,464 |  | 2,199,464 |  | 2,010,489
Originated loans [Member] | Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 2,787 | 2,471 | 2,422 | 2,374 | 2,374
Allowance for loan losses: Charge-offs |  |  |  |  | 1
Allowance for loan losses: Provisions | (138) | 109 | 227 | 206 | 49
Allowance for loan losses: Ending Balance | 2,649 | 2,580 | 2,649 | 2,580 | 2,422
Loans receivables: Ending balance | 213,095 |  | 213,095 |  | 212,020
Originated loans [Member] | Commercial and Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 14,867 | 15,077 | 15,235 | 14,000 | 14,000
Allowance for loan losses: Charge-offs |  |  |  | 111 | 111
Allowance for loan losses: Provisions | 1,830 | (826) | 1,462 | 362 | 1,346
Allowance for loan losses: Ending Balance | 16,697 | 14,251 | 16,697 | 14,251 | 15,235
Loans receivables: Ending balance | 1,532,902 |  | 1,532,902 |  | 1,485,286
Originated loans [Member] | Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 1,105 | 1,209 | 1,244 | 1,003 | 1,003
Allowance for loan losses: Provisions | 229 | 245 | 90 | 451 | 241
Allowance for loan losses: Ending Balance | 1,334 | 1,454 | 1,334 | 1,454 | 1,244
Loans receivables: Ending balance | 111,463 |  | 111,463 |  | 104,996
Originated loans [Member] | Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 3,004 | 3,328 | 2,945 | 3,869 | 3,869
Allowance for loan losses: Charge-offs |  |  |  | 145 | 145
Allowance for loan losses: Recoveries |  | 7 | 302 | 15 | 15
Allowance for loan losses: Provisions | 154 | 660 | (89) | 256 | (794)
Allowance for loan losses: Ending Balance | 3,158 | 3,995 | 3,158 | 3,995 | 2,945
Loans receivables: Ending balance | 289,814 |  | 289,814 |  | 157,413
Originated loans [Member] | Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 621 | 265 | 330 | 313 | 313
Allowance for loan losses: Provisions | 59 | 9 | 350 | (39) | 17
Allowance for loan losses: Ending Balance | 680 | 274 | 680 | 274 | 330
Loans receivables: Ending balance | 51,590 |  | 51,590 |  | 50,100
Originated loans [Member] | Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 5 |  |  | 2 | 2
Allowance for loan losses: Recoveries | 4 |  | 4 |  |
Allowance for loan losses: Provisions | (3) | 1 | 2 | (1) | (2)
Allowance for loan losses: Ending Balance | 6 | 1 | 6 | 1 |
Loans receivables: Ending balance | 600 |  | 600 |  | 674
Originated loans [Member] | Unallocated [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 1,762 | 32 | 273 | 189 | 189
Allowance for loan losses: Provisions | 727 | 118 | 2,216 | (39) | 84
Allowance for loan losses: Ending Balance | 2,489 | 150 | 2,489 | 150 | 273
Acquired loans recorded at fair value [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 1,279 | 404 | 1,122 | 335 | 335
Allowance for loan losses: Charge-offs |  |  | 4 |  | 486
Allowance for loan losses: Recoveries | 4 | 23 | 6 | 27 | 34
Allowance for loan losses: Provisions | 444 | 304 | 603 | 369 | 1,239
Allowance for loan losses: Ending Balance | 1,727 | 731 | 1,727 | 731 | 1,122
Loans receivables: Ending balance | 173,611 |  | 173,611 |  | 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 | 306 | 404 | 261 | 335 | 335
Allowance for loan losses: Charge-offs |  |  | 4 |  | 65
Allowance for loan losses: Recoveries |  | 3 |  | 3 | 3
Allowance for loan losses: Provisions | 85 | 324 | 134 | 393 | (12)
Allowance for loan losses: Ending Balance | 391 | 731 | 391 | 731 | 261
Loans receivables: Ending balance | 33,047 |  | 33,047 |  | 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 | 63 |  | 58 |  |
Allowance for loan losses: Charge-offs |  |  |  |  | 118
Allowance for loan losses: Recoveries |  |  |  | 10 | 10
Allowance for loan losses: Provisions | 163 |  | 168 | (10) | 166
Allowance for loan losses: Ending Balance | 226 |  | 226 |  | 58
Loans receivables: Ending balance | 110,337 |  | 110,337 |  | 118,577
Acquired loans recorded at fair value [Member] | Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Recoveries |  | 10 |  |  |
Allowance for loan losses: Provisions |  | (10) |  |  |
Acquired loans recorded at fair value [Member] | Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 910 |  | 803 |  |
Allowance for loan losses: Charge-offs |  |  |  |  | 303
Allowance for loan losses: Recoveries |  | 2 |  | 3 | 5
Allowance for loan losses: Provisions | 200 | (2) | 307 | (3) | 1,101
Allowance for loan losses: Ending Balance | 1,110 |  | 1,110 |  | 803
Loans receivables: Ending balance | 18,566 |  | 18,566 |  | 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 | 4 | 8 | 6 | 11 | 16
Allowance for loan losses: Provisions | (4) | (8) | (6) | (11) | (16)
Loans receivables: Ending balance | 11,658 |  | 11,658 |  | 14,302
Acquired loans recorded at fair value [Member] | Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivables: Ending balance | 3 |  | 3 |  | 8
Acquired loans with deteriorated credit [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 104 | 218 | 163 | 274 | 274
Allowance for loan losses: Recoveries | 8 |  |  |  |
Allowance for loan losses: Provisions | (2) | 135 | (61) | 79 | (111)
Allowance for loan losses: Ending Balance | 102 | 353 | 102 | 353 | 163
Loans receivables: Ending balance | 3,181 |  | 3,181 |  | 5,610
Acquired loans with deteriorated credit [Member] | Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning Balance | 38 | 32 | 39 | 39 | 39
Allowance for loan losses: Provisions | (2) | 114 | (3) | 107 |
Allowance for loan losses: Ending Balance | 36 | 146 | 36 | 146 | 39
Loans receivables: Ending balance | 1,329 |  | 1,329 |  | 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 | 144 | 79 | 168 | 168
Allowance for loan losses: Provisions |  | (7) | (60) | (31) | (89)
Allowance for loan losses: Ending Balance | 19 | 137 | 19 | 137 | 79
Loans receivables: Ending balance | 715 |  | 715 |  | 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 | 39 | 42 | 64 | 64
Allowance for loan losses: Provisions |  | 28 | 1 | 3 | (22)
Allowance for loan losses: Ending Balance | 43 | 67 | 43 | 67 | 42
Loans receivables: Ending balance | 904 |  | 904 |  | 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 | 3
Allowance for loan losses: Recoveries | 4 |  |  |  |
Allowance for loan losses: Provisions |  |  | 1 |  |
Allowance for loan losses: Ending Balance | 4 | $ 3 | 4 | $ 3 | 3
Loans receivables: Ending balance | 233 |  | $ 233 |  | $ 236
Acquired loans with deteriorated credit [Member] | Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses: Recoveries | $ 4 |  |  |  |

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