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Loans Receivable and Allowance for Loan Losses (Impaired Loans) (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] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | $ 20,880 | $ 24,844 | $ 19,258 | $ 26,919 |
Average Recorded Investment - With an allowance recorded | 8,202 | 9,225 | 7,799 | 8,674 |
Interest Income Recognized - With no related allowance recorded | 111 | 239 | 587 | 845 |
Interest Income Recognized - With an allowance recorded | 87 | 74 | 218 | 256 |
Recorded Investment - With no related allowance recorded | 22,903 |  | 22,903 |  | $ 19,647
Recorded Investment - With an allowance recorded | 8,415 |  | 8,415 |  | 7,265
Recorded Investment - Total | 31,318 |  | 31,318 |  | 26,912
Unpaid Principal Balance - With no related allowance recorded | 31,217 |  | 31,217 |  | 29,082
Unpaid Principal Balance - With an allowance recorded | 12,815 |  | 12,815 |  | 10,270
Unpaid Principal Balance - Total | 44,032 |  | 44,032 |  | 39,352
Related Allowance | 3,853 |  | 3,853 |  | 3,264
Originated loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 12,474 | 12,563 | 10,819 | 14,094 |
Average Recorded Investment - With an allowance recorded | 2,656 | 3,122 | 2,563 | 3,062 |
Interest Income Recognized - With no related allowance recorded | 57 | 125 | 351 | 520 |
Interest Income Recognized - With an allowance recorded | 66 | 22 | 109 | 129 |
Recorded Investment - With no related allowance recorded | 14,202 |  | 14,202 |  | 8,171
Recorded Investment - With an allowance recorded | 3,105 |  | 3,105 |  | 2,755
Unpaid Principal Balance - With no related allowance recorded | 16,501 |  | 16,501 |  | 11,287
Unpaid Principal Balance - With an allowance recorded | 5,899 |  | 5,899 |  | 4,392
Related Allowance | 1,509 |  | 1,509 |  | 1,097
Originated loans [Member] | Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 2,125 | 2,179 | 2,076 | 2,627 |
Average Recorded Investment - With an allowance recorded | 908 | 2,032 | 910 | 2,175 |
Interest Income Recognized - With no related allowance recorded | 11 | 20 | 51 | 66 |
Interest Income Recognized - With an allowance recorded |  | 18 | 10 | 67 |
Recorded Investment - With no related allowance recorded | 2,278 |  | 2,278 |  | 2,010
Recorded Investment - With an allowance recorded | 904 |  | 904 |  | 973
Unpaid Principal Balance - With no related allowance recorded | 2,381 |  | 2,381 |  | 2,098
Unpaid Principal Balance - With an allowance recorded | 906 |  | 906 |  | 973
Related Allowance | 37 |  | 37 |  | 48
Originated loans [Member] | Commercial and Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 5,867 | 8,655 | 5,211 | 9,680 |
Interest Income Recognized - With no related allowance recorded | 8 | 56 | 98 | 310 |
Recorded Investment - With no related allowance recorded | 7,842 |  | 7,842 |  | 4,469
Unpaid Principal Balance - With no related allowance recorded | 7,891 |  | 7,891 |  | 4,527
Originated loans [Member] | Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 3,516 | 1,131 | 2,677 | 1,138 |
Average Recorded Investment - With an allowance recorded | 1,427 | 822 | 1,314 | 658 |
Interest Income Recognized - With no related allowance recorded | 32 | 43 | 183 | 126 |
Interest Income Recognized - With an allowance recorded | 65 | 3 | 93 | 57 |
Recorded Investment - With no related allowance recorded | 3,144 |  | 3,144 |  | 1,108
Recorded Investment - With an allowance recorded | 1,829 |  | 1,829 |  | 1,403
Unpaid Principal Balance - With no related allowance recorded | 5,289 |  | 5,289 |  | 4,069
Unpaid Principal Balance - With an allowance recorded | 4,614 |  | 4,614 |  | 3,037
Related Allowance | 1,448 |  | 1,448 |  | 1,029
Originated loans [Member] | Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 966 | 598 | 855 | 649 |
Average Recorded Investment - With an allowance recorded | 321 | 268 | 339 | 229 |
Interest Income Recognized - With no related allowance recorded | 6 | 6 | 19 | 18 |
Interest Income Recognized - With an allowance recorded | 1 | 1 | 6 | 5 |
Recorded Investment - With no related allowance recorded | 938 |  | 938 |  | 584
Recorded Investment - With an allowance recorded | 372 |  | 372 |  | 379
Unpaid Principal Balance - With no related allowance recorded | 940 |  | 940 |  | 593
Unpaid Principal Balance - With an allowance recorded | 379 |  | 379 |  | 382
Related Allowance | 24 |  | 24 |  | 20
Acquired loans recorded at fair value [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 5,836 | 6,243 | 5,914 | 6,369 |
Average Recorded Investment - With an allowance recorded | 5,206 | 4,633 | 4,836 | 4,510 |
Interest Income Recognized - With no related allowance recorded | 24 | 93 | 160 | 261 |
Interest Income Recognized - With an allowance recorded | 21 | 45 | 102 | 108 |
Recorded Investment - With no related allowance recorded | 5,983 |  | 5,983 |  | 6,632
Recorded Investment - With an allowance recorded | 5,149 |  | 5,149 |  | 3,986
Unpaid Principal Balance - With no related allowance recorded | 6,083 |  | 6,083 |  | 7,147
Unpaid Principal Balance - With an allowance recorded | 6,755 |  | 6,755 |  | 5,307
Related Allowance | 2,343 |  | 2,343 |  | 2,160
Acquired loans recorded at fair value [Member] | Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 1,555 | 1,931 | 1,647 | 2,081 |
Average Recorded Investment - With an allowance recorded | 2,472 | 3,291 | 2,404 | 3,286 |
Interest Income Recognized - With no related allowance recorded | 5 | 23 | 41 | 73 |
Interest Income Recognized - With an allowance recorded | 3 | 30 | 33 | 82 |
Recorded Investment - With no related allowance recorded | 1,562 |  | 1,562 |  | 1,843
Recorded Investment - With an allowance recorded | 2,470 |  | 2,470 |  | 2,278
Unpaid Principal Balance - With no related allowance recorded | 1,660 |  | 1,660 |  | 1,950
Unpaid Principal Balance - With an allowance recorded | 2,504 |  | 2,504 |  | 2,293
Related Allowance | 347 |  | 347 |  | 325
Acquired loans recorded at fair value [Member] | Commercial and Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 4,060 | 3,882 | 4,053 | 3,898 |
Average Recorded Investment - With an allowance recorded | 1,221 | 881 | 1,225 | 889 |
Interest Income Recognized - With no related allowance recorded | 19 | 55 | 113 | 165 |
Interest Income Recognized - With an allowance recorded |  | 14 | 20 | 22 |
Recorded Investment - With no related allowance recorded | 4,227 |  | 4,227 |  | 4,401
Recorded Investment - With an allowance recorded | 1,216 |  | 1,216 |  | 1,248
Unpaid Principal Balance - With no related allowance recorded | 4,227 |  | 4,227 |  | 4,402
Unpaid Principal Balance - With an allowance recorded | 1,417 |  | 1,417 |  | 1,442
Related Allowance | 313 |  | 313 |  | 342
Acquired loans recorded at fair value [Member] | Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded |  | 119 |  | 96 |
Average Recorded Investment - With an allowance recorded | 1,403 | 377 | 1,106 | 251 |
Interest Income Recognized - With no related allowance recorded |  | 12 |  | 14 |
Interest Income Recognized - With an allowance recorded | 17 |  | 47 |  |
Recorded Investment - With no related allowance recorded |  |  |  |  | 183
Recorded Investment - With an allowance recorded | 1,325 |  | 1,325 |  | 377
Unpaid Principal Balance - With no related allowance recorded |  |  |  |  | 589
Unpaid Principal Balance - With an allowance recorded | 2,695 |  | 2,695 |  | 1,489
Related Allowance | 1,680 |  | 1,680 |  | 1,489
Acquired loans recorded at fair value [Member] | Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 221 | 311 | 214 | 294 |
Average Recorded Investment - With an allowance recorded | 110 | 84 | 101 | 84 |
Interest Income Recognized - With no related allowance recorded |  | 3 | 6 | 9 |
Interest Income Recognized - With an allowance recorded | 1 | 1 | 2 | 4 |
Recorded Investment - With no related allowance recorded | 194 |  | 194 |  | 205
Recorded Investment - With an allowance recorded | 138 |  | 138 |  | 83
Unpaid Principal Balance - With no related allowance recorded | 196 |  | 196 |  | 206
Unpaid Principal Balance - With an allowance recorded | 139 |  | 139 |  | 83
Related Allowance | 3 |  | 3 |  | 4
Acquired loans with deteriorated credit [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 2,570 | 6,038 | 2,525 | 6,456 |
Average Recorded Investment - With an allowance recorded | 340 | 1,470 | 400 | 1,102 |
Interest Income Recognized - With no related allowance recorded | 30 | 21 | 76 | 64 |
Interest Income Recognized - With an allowance recorded |  | 7 | 7 | 19 |
Recorded Investment - With no related allowance recorded | 2,718 |  | 2,718 |  | 4,844
Recorded Investment - With an allowance recorded | 161 |  | 161 |  | 524
Unpaid Principal Balance - With no related allowance recorded | 8,633 |  | 8,633 |  | 10,648
Unpaid Principal Balance - With an allowance recorded | 161 |  | 161 |  | 571
Related Allowance | 1 |  | 1 |  | 7
Acquired loans with deteriorated credit [Member] | Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 984 | 839 | 929 | 898 |
Average Recorded Investment - With an allowance recorded | 340 | 527 | 400 | 473 |
Interest Income Recognized - With no related allowance recorded |  | 14 | 28 | 44 |
Interest Income Recognized - With an allowance recorded |  | 7 | 7 | 19 |
Recorded Investment - With no related allowance recorded | 1,158 |  | 1,158 |  | 827
Recorded Investment - With an allowance recorded | 161 |  | 161 |  | 524
Unpaid Principal Balance - With no related allowance recorded | 1,762 |  | 1,762 |  | 1,383
Unpaid Principal Balance - With an allowance recorded | 161 |  | 161 |  | 571
Related Allowance | 1 |  | 1 |  | 7
Acquired loans with deteriorated credit [Member] | Commercial and Multi-family [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 705 | 4,264 | 710 | 4,666 |
Average Recorded Investment - With an allowance recorded |  | 943 |  | 629 |
Interest Income Recognized - With no related allowance recorded | 9 | 7 | 23 | 20 |
Recorded Investment - With no related allowance recorded | 695 |  | 695 |  | 3,113
Unpaid Principal Balance - With no related allowance recorded | 1,749 |  | 1,749 |  | 4,166
Acquired loans with deteriorated credit [Member] | Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | 864 | 894 | 864 | 849 |
Interest Income Recognized - With no related allowance recorded | 21 |  | 25 |  |
Recorded Investment - With no related allowance recorded | 865 |  | 865 |  | 867
Unpaid Principal Balance - With no related allowance recorded | 5,122 |  | 5,122 |  | 5,052
Acquired loans with deteriorated credit [Member] | Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Average Recorded Investment - With no related allowance recorded | $ 17 | $ 41 | $ 22 | $ 43 |
Recorded Investment - With no related allowance recorded |  |  |  |  | 37
Unpaid Principal Balance - With no related allowance recorded |  |  |  |  | $ 47

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