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Loans - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net deferred loan costs | $ 6,428 | $ 5,560 | $ 6,428 | $ 5,560 | $ 5,748
Qualifying first mortgage loans | 311,152 | 245,000 | 311,152 | 245,000 | 239,805
Loans pledged as collateral | 229,769 | 297,712 | $ 229,769 | $ 297,712 | $ 290,247
Loans classified as TDR (loan) | loan |  |  | 71 | 67 | 62
Value of loans classified as TDR | $ 25,661 | $ 19,760 | $ 25,661 | $ 19,760 | $ 17,801
Number of Loans | loan | 10 | 14 | 10 | 14 |
Value of TDR loans more than 30 days past due | $ 1,271 | $ 1,849 | $ 1,271 | $ 1,849 |
Number of TDR loans more than 30 days past due (loan) | loan |  | 0 |  | 0 |
Number of loans placed on TDR status (loan) | loan | 1 | 0 | 11 | 0 |
Number of TDR loans involved in bankruptcy (loan) | loan | 4 |  | 4 |  |
Value of TDR loans involved in bankruptcy | $ 676 |  | $ 676 |  |
Number of TDR loans on non-accrual status (loan) | loan | 12 |  | 12 |  |
Value of TDR loans on non-accrual status | $ 7,735 |  | $ 7,735 |  |
Number of TDR loans in the process of foreclosure (loan) | loan | 4 |  | 4 |  |
Loans classified as TDRs in process of foreclosure | $ 504 |  | $ 504 |  |
Number of mortgage loans in the process of foreclosure (loan) | loan | 14 | 14 | 14 | 14 |
Value of mortgage loans in the process of foreclosure | $ 1,337 | $ 1,861 | $ 1,337 | $ 1,861 |
Unallocated |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of days past due |  |  | 30 days | 30 days |

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- Definition The number of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date. + References No definition available. + Details
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + 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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