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Fair Value Disclosures - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | $ 174,114 | $ 201,688
Derivative financial instruments | 3,411 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 174,114 | 201,688
Derivative financial instruments | 3,411 | 1,174
U.S. Government-sponsored enterprises (GSEs) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 23,988 | 43,503
Municipal securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 56,726 | 55,161
Other debt securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 937 | 910
Fair Value, Recurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 174,114 | 201,688
Derivative financial instruments | 3,411 | 1,174
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Derivative financial instruments | 0 | 0
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 174,114 | 201,688
Derivative financial instruments | 3,411 | 1,174
Fair Value, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Derivative financial instruments | 0 | 0
Fair Value, Recurring [Member] | U.S. Government-sponsored enterprises (GSEs) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 23,988 | 43,503
Fair Value, Recurring [Member] | U.S. Government-sponsored enterprises (GSEs) [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value, Recurring [Member] | U.S. Government-sponsored enterprises (GSEs) [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 23,988 | 43,503
Fair Value, Recurring [Member] | U.S. Government-sponsored enterprises (GSEs) [Member] | Significant Other Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value, Recurring [Member] | Municipal securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 56,726 | 55,161
Fair Value, Recurring [Member] | Municipal securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value, Recurring [Member] | Municipal securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 56,726 | 55,161
Fair Value, Recurring [Member] | Municipal securities [Member] | Significant Other Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value, Recurring [Member] | Other debt securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 937 | 910
Fair Value, Recurring [Member] | Other debt securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value, Recurring [Member] | Other debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 937 | 910
Fair Value, Recurring [Member] | Other debt securities [Member] | Significant Other Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value, Recurring [Member] | Mortgage-backed securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 92,463 | 102,114
Fair Value, Recurring [Member] | Mortgage-backed securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value, Recurring [Member] | Mortgage-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 92,463 | 102,114
Fair Value, Recurring [Member] | Mortgage-backed securities [Member] | Significant Other Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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