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Loans Receivable - Allowance for Loan Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Allowance for loan losses and the loans receivable by portfolio segment |  |  |
Individually evaluated for impairment | $ 27 | $ 0 |
Collectively evaluated for impairment | 8,443 | 8,366 |
Allowance for loan losses | 8,470 | 8,366 | $ 8,127
Individually evaluated for impairment | 3,141 | 5,214 |
Collectively evaluated for impairment | 1,328,053 | 1,316,537 |
Total loans | 1,331,194 | 1,321,751 |
Net deferred loan origination costs | 1,069 | 1,266 |
Loans, net | 1,323,793 | 1,314,651 |
One-to-four family residential real estate loans [Member] |  |  |
Allowance for loan losses and the loans receivable by portfolio segment |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 699 | 850 |
Allowance for loan losses | 699 | 850 |
Individually evaluated for impairment | 2,218 | 4,265 |
Collectively evaluated for impairment | 68,153 | 93,549 |
Total loans | 70,371 | 97,814 |
Multi-family mortgage loans [Member] |  |  |
Allowance for loan losses and the loans receivable by portfolio segment |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 3,991 | 3,849 |
Allowance for loan losses | 3,991 | 3,849 |
Individually evaluated for impairment | 653 | 949 |
Collectively evaluated for impairment | 619,217 | 587,434 |
Total loans | 619,870 | 588,383 |
Nonresidential Real Estate [Member] |  |  |
Allowance for loan losses and the loans receivable by portfolio segment |  |  |
Individually evaluated for impairment | 27 | 0 |
Collectively evaluated for impairment | 1,449 | 1,605 |
Allowance for loan losses | 1,476 | 1,605 |
Individually evaluated for impairment | 270 | 0 |
Collectively evaluated for impairment | 152,172 | 169,971 |
Total loans | 152,442 | 169,971 |
Construction and land loans [Member] |  |  |
Allowance for loan losses and the loans receivable by portfolio segment |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 4 | 32 |
Allowance for loan losses | 4 | 32 |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 172 | 1,358 |
Total loans | 172 | 1,358 |
Commercial loans [Member] |  |  |
Allowance for loan losses and the loans receivable by portfolio segment |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 1,517 | 1,357 |
Allowance for loan losses | 1,517 | 1,357 |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 187,406 | 152,552 |
Total loans | 187,406 | 152,552 |
Commercial leases [Member] |  |  |
Allowance for loan losses and the loans receivable by portfolio segment |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 755 | 655 |
Allowance for loan losses | 755 | 655 |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 299,394 | 310,076 |
Total loans | 299,394 | 310,076 |
Consumer loans [Member] |  |  |
Allowance for loan losses and the loans receivable by portfolio segment |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 28 | 18 |
Allowance for loan losses | 28 | 18 |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 1,539 | 1,597 |
Total loans | $ 1,539 | $ 1,597 |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + 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 (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + 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 deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts 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) -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 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 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) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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