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Fair Value - Assets Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | $ 300,172 | $ 298,999
U.S. Government-sponsored agencies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | $ 4,979 |  |
Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 289,989 | 288,789
Debt Securities, Available-for-sale | 292,570 |  |
State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 6,769 | 6,842
Debt Securities, Available-for-sale | 4,638 |  |
Other equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 3,414 | 3,368
Total Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 300,172 | 298,999
Debt Securities, Available-for-sale | 305,444 |  |
Derivative asset | 2,888 | 1,955 | 1,592
Total Fair Value | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Derivative asset | 0 | 0 | 0
Total Fair Value | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 300,172 | 298,999
Debt Securities, Available-for-sale | 305,444 |  |
Derivative asset | 2,888 | 1,955 | 1,592
Total Fair Value | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Derivative asset | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Total assets | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative asset | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Government-sponsored agencies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Fair Value, Measurements, Recurring | Level 1 | Other equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 300,172 | 298,999
Debt Securities, Available-for-sale | 305,444 |  |
Total assets | 308,332 | 302,127 | 300,591
Fair Value, Measurements, Recurring | Level 2 | Interest Rate Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative asset | 2,888 | 1,955 | 1,592
Fair Value, Measurements, Recurring | Level 2 | U.S. Government-sponsored agencies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 4,979 |  |
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 289,989 | 288,789
Debt Securities, Available-for-sale | 292,570 |  |
Fair Value, Measurements, Recurring | Level 2 | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 6,769 | 6,842
Debt Securities, Available-for-sale | 4,638 |  |
Fair Value, Measurements, Recurring | Level 2 | Other equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 3,414 | 3,368
Debt Securities, Available-for-sale | 3,257 |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Total assets | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Interest Rate Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative asset | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Government-sponsored agencies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Fair Value, Measurements, Recurring | Level 3 | Other equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 0 | 0
Debt Securities, Available-for-sale | 0 |  |
Fair Value, Measurements, Recurring | Total Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 300,172 | 298,999
Debt Securities, Available-for-sale | 305,444 |  |
Total assets | 308,332 | 302,127 | 300,591
Fair Value, Measurements, Recurring | Total Fair Value | Interest Rate Swap |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative asset | 2,888 | 1,955 | 1,592
Fair Value, Measurements, Recurring | Total Fair Value | U.S. Government-sponsored agencies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale | 4,979 |  |
Fair Value, Measurements, Recurring | Total Fair Value | Mortgage-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 289,989 | 288,789
Debt Securities, Available-for-sale | 292,570 |  |
Fair Value, Measurements, Recurring | Total Fair Value | State and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | 6,769 | 6,842
Debt Securities, Available-for-sale | 4,638 |  |
Fair Value, Measurements, Recurring | Total Fair Value | Other equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale |  | $ 3,414 | $ 3,368
Debt Securities, Available-for-sale | $ 3,257 |  |

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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 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: 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=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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