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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | $ 2,185 | $ 2,078
Debt securities, available-for-sale, at fair value | 217,668 | 238,421
Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 219,853 | 240,499
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 4,442 | 4,313
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 215,411 | 236,186
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
Nonrecurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Fair Value | 1,327 | 1,283
Nonrecurring fair value measurements: |  |
Impaired loans | 1,083 | 1,039
Other real estate owned and repossessed assets | 244 | 244
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Fair Value | 0 | 0
Nonrecurring fair value measurements: |  |
Impaired loans | 0 | 0
Other real estate owned and repossessed assets | 0 | 0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Fair Value | 0 | 0
Nonrecurring fair value measurements: |  |
Impaired loans | 0 | 0
Other real estate owned and repossessed assets | 0 | 0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Fair Value | 1,327 | 1,283
Nonrecurring fair value measurements: |  |
Impaired loans | 1,083 | 1,039
Other real estate owned and repossessed assets | 244 | 244
U.S. Treasury notes [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 2,257 | 2,235
U.S. Treasury notes [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 2,257 | 2,235
U.S. Treasury notes [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 2,257 | 2,235
U.S. Treasury notes [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
U.S. Treasury notes [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
U.S. Agency notes [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 74,450 | 78,340
U.S. Agency notes [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 74,450 | 78,340
U.S. Agency notes [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
U.S. Agency notes [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 74,450 | 78,340
U.S. Agency notes [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
U.S. Agency mortgage-backed securities [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 54,566 | 55,610
U.S. Agency mortgage-backed securities [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 54,566 | 55,610
U.S. Agency mortgage-backed securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
U.S. Agency mortgage-backed securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 54,566 | 55,610
U.S. Agency mortgage-backed securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
Non-taxable Municipal securities [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 69,715 | 84,714
Non-taxable Municipal securities [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 69,715 | 84,714
Non-taxable Municipal securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
Non-taxable Municipal securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 69,715 | 84,714
Non-taxable Municipal securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
Taxable Municipal securities [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 16,680 | 17,522
Taxable Municipal securities [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 16,680 | 17,522
Taxable Municipal securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
Taxable Municipal securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 16,680 | 17,522
Taxable Municipal securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Debt securities, available-for-sale, at fair value | 0 | 0
Mutual funds [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 43 |
Equity securities with a readily determinable fair value: |  | 39
Mutual funds [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 43 |
Equity securities with a readily determinable fair value: |  | 39
Mutual funds [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 0 |
Equity securities with a readily determinable fair value: |  | 0
Mutual funds [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 0 |
Equity securities with a readily determinable fair value: |  | 0
Mutual Funds Measured At Net Asset Value [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 1,256 |
Equity securities with a readily determinable fair value: |  | 1,520
Mutual Funds Measured At Net Asset Value [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 0 |
Equity securities with a readily determinable fair value: |  | 0
Mutual Funds Measured At Net Asset Value [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 0 |
Equity securities with a readily determinable fair value: |  | 0
Equity securities [Member] | Recurring [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 886 |
Equity securities with a readily determinable fair value: |  | 519
Equity securities [Member] | Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 886 |
Equity securities with a readily determinable fair value: |  | 519
Equity securities [Member] | Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | 0 |
Equity securities with a readily determinable fair value: |  | 0
Equity securities [Member] | Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Recurring fair value measurement [Abstract] |  |
Equity securities with a readily determinable fair value, at fair value | $ 0 |
Equity securities with a readily determinable fair value: |  | $ 0

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