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Fair Value Disclosures - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | $ 198,272,685 | $ 201,687,683
Derivative financial instruments | 2,063,000 | 1,174,000
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
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 198,273,000 | 201,688,000
Derivative financial instruments | 2,063,000 | 1,174,000
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
U.S. Government-sponsored enterprises (GSEs) [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 38,828,000 | 43,503,000
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
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 | 38,828,000 | 43,503,000
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
Mortgage-backed securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 99,582,000 | 102,114,000
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
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 | 99,582,000 | 102,114,000
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
Other debt securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 935,000 | 910,000
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
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 | 935,000 | 910,000
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
Municipal securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities available-for-sale, at fair value | 58,928,000 | 55,161,000
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
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 | 58,928,000 | 55,161,000
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

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