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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | $ 434,697,000 |  | $ 535,281,000 |  |  |
Equity securities | 7,184,000 |  | 7,423,000 |  |  |
Valuation allowance | 9,025,000 | $ 8,916,000 | 8,778,000 | $ 8,920,000 | $ 9,297,000 | $ 9,326,000
Liabilities fair value nonrecurring | 0 |  | 0 |  |  |
Carrying Amount |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 7,184,000 |  | 7,423,000 |  |  |
Loans, net | 902,852,000 |  | 891,901,000 |  |  |
Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 7,184,000 |  | 7,423,000 |  |  |
Loans, net | 896,241,000 |  | 899,191,000 |  |  |
Loans, charge-offs | 0 | $ 0 | 0 |  |  |
Other equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities |  |  | 7,500,000 |  |  |
Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net | 0 |  | 0 |  |  |
Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 0 |  | 0 |  |  |
Loans, net | 0 |  | 0 |  |  |
Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 0 |  | 0 |  |  |
Loans, net | 896,241,000 |  | 899,191,000 |  |  |
Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 441,881,000 |  | 542,704,000 |  |  |
Recurring | U.S. Government agencies | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 22,243,000 |  | 66,587,000 |  |  |
Recurring | Obligations of states and political subdivisions | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 66,114,000 |  | 143,105,000 |  |  |
Recurring | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 243,948,000 |  | 234,908,000 |  |  |
Recurring | Private label mortgage and asset backed securities | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 102,392,000 |  | 90,681,000 |  |  |
Recurring | Other equity securities | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 7,184,000 |  | 7,423,000 |  |  |
Recurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 7,184,000 |  | 7,423,000 |  |  |
Recurring | Level 1 | U.S. Government agencies |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  | 0 |  |  |
Recurring | Level 1 | Obligations of states and political subdivisions |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  | 0 |  |  |
Recurring | Level 1 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  | 0 |  |  |
Recurring | Level 1 | Private label mortgage and asset backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  | 0 |  |  |
Recurring | Level 1 | Other equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 7,184,000 |  | 7,423,000 |  |  |
Recurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 434,697,000 |  | 535,281,000 |  |  |
Recurring | Level 2 | U.S. Government agencies |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 22,243,000 |  | 66,587,000 |  |  |
Recurring | Level 2 | Obligations of states and political subdivisions |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 66,114,000 |  | 143,105,000 |  |  |
Recurring | Level 2 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 243,948,000 |  | 234,908,000 |  |  |
Recurring | Level 2 | Private label mortgage and asset backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 102,392,000 |  | 90,681,000 |  |  |
Recurring | Level 2 | Other equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 0 |  | 0 |  |  |
Recurring | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 0 |  | 0 |  |  |
Recurring | Level 3 | U.S. Government agencies |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  | 0 |  |  |
Recurring | Level 3 | Obligations of states and political subdivisions |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  | 0 |  |  |
Recurring | Level 3 | U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  | 0 |  |  |
Recurring | Level 3 | Private label mortgage and asset backed securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Available-for-sale debt securities | 0 |  | 0 |  |  |
Recurring | Level 3 | Other equity securities |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities | 0 |  | 0 |  |  |
Nonrecurring | Carrying Amount | Impaired Financing Receivable |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net | 163,000 |  |  |  |  |
Valuation allowance | 163,000 |  |  |  |  |
Nonrecurring | Carrying Amount | Impaired Financing Receivable |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net |  |  | 0 |  |  |
Nonrecurring | Fair Value |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other repossessed assets |  |  | 70,000 |  |  |
Assets, fair value |  |  | 70,000 |  |  |
Valuation allowance |  |  | 0 |  |  |
Nonrecurring | Fair Value | Impaired Financing Receivable |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loans, net | $ 0 |  |  |  |  |
Nonrecurring | Level 1 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other repossessed assets |  |  | 0 |  |  |
Assets, fair value |  |  | 0 |  |  |
Nonrecurring | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other repossessed assets |  |  | 0 |  |  |
Assets, fair value |  |  | 0 |  |  |
Nonrecurring | Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other repossessed assets |  |  | 70,000 |  |  |
Assets, fair value |  |  | $ 70,000 |  |  |

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