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Loans Receivable - Activity in the Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 8,366 |  |  |  | $ 8,127 | $ 8,366 | $ 8,127
Loans charged off |  |  |  |  |  |  |  |  | (518) | (503)
Recoveries |  |  |  |  |  |  |  |  | 477 | 829
Net charge-off |  |  |  |  |  |  |  |  | 41 | (326)
Provision for (recovery of) loan losses | $ 403 | $ (23) | $ 23 | (258) | $ (72) | $ (225) | $ 49 | $ 161 | 145 | (87)
Ending balance | 8,470 |  |  |  | 8,366 |  |  |  | 8,470 | 8,366
One-to-four family residential real estate loans [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 850 |  |  |  |  | 850 |
Loans charged off |  |  |  |  |  |  |  |  | (231) | (318)
Recoveries |  |  |  |  |  |  |  |  | 206 | 145
Ending balance | 699 |  |  |  | 850 |  |  |  | 699 | 850
Multi-family mortgage loans [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 3,849 |  |  |  |  | 3,849 |
Loans charged off |  |  |  |  |  |  |  |  | (35) | (10)
Recoveries |  |  |  |  |  |  |  |  | 34 | 70
Ending balance | 3,991 |  |  |  | 3,849 |  |  |  | 3,991 | 3,849
Nonresidential real estate loans [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Loans charged off |  |  |  |  |  |  |  |  | (93) | (165)
Recoveries |  |  |  |  |  |  |  |  | 0 | 17
Construction and land loans [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 32 |  |  |  |  | 32 |
Recoveries |  |  |  |  |  |  |  |  | 2 | 0
Ending balance | 4 |  |  |  | 32 |  |  |  | 4 | 32
Commercial loans [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,357 |  |  |  |  | 1,357 |
Loans charged off |  |  |  |  |  |  |  |  | (140) | 0
Recoveries |  |  |  |  |  |  |  |  | 229 | 594
Ending balance | 1,517 |  |  |  | 1,357 |  |  |  | 1,517 | 1,357
Commercial leases [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 655 |  |  |  |  | 655 |
Recoveries |  |  |  |  |  |  |  |  | 5 | 2
Ending balance | 755 |  |  |  | 655 |  |  |  | 755 | 655
Consumer loans [Member] |  |  |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 18 |  |  |  |  | 18 |
Loans charged off |  |  |  |  |  |  |  |  | (19) | (10)
Recoveries |  |  |  |  |  |  |  |  | 1 | 1
Ending balance | $ 28 |  |  |  | $ 18 |  |  |  | $ 28 | $ 18

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- Definition Allowance for loan and lease losses charge offs, net. + References No definition available. + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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