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Fair Market Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | $ 599,299 | $ 593,746 |
Equity securities at fair value | 1,528 | 1,173 |
Assets measured-nonrecurring basis [Abstract] |  |  |
Impaired loans (collateral dependent) | 1,078 | 747 |
Reconciliation of beginning and ending balances of recurring fair value measurements recognized in balance sheet using significant unobservable (Level 3) inputs [Roll Forward] |  |  |
Total gains | $ 116 |  | $ 122
Minimum [Member] |  |  |
Other real estate owned [Abstract] |  |  |
Typical frequency of periodic reviews | 12 months |  |
Maximum [Member] |  |  |
Other real estate owned [Abstract] |  |  |
Typical frequency of periodic reviews | 18 months |  |
Frequency of periodic reviews in general | 24 months |  |
U.S. Treasury and Government Agencies [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | $ 177,477 | 217,938 |
State and Political Subdivisions [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 123,729 | 124,488 |
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 297,591 | 250,819 |
Other Debt Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 502 | 501 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 56,744 | 91,028 |
Equity securities at fair value | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 542,555 | 502,718 |
Equity securities at fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 0 | 0 |
Equity securities at fair value | 1,528 | 1,173 |
Recurring [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Equity securities at fair value | 1,528 | 1,173 |
Mortgage servicing rights | 3,390 | 3,607 |
Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 177,477 | 217,938 |
Recurring [Member] | State and Political Subdivisions [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 123,729 | 124,488 |
Recurring [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 297,591 | 250,819 |
Recurring [Member] | Other Debt Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 502 | 501 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Equity securities at fair value | 0 | 0 |
Mortgage servicing rights | 0 | 0 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury and Government Agencies [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 56,744 | 91,028 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and Political Subdivisions [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 0 | 0 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 0 | 0 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Debt Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 0 | 0 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Equity securities at fair value | 0 | 0 |
Mortgage servicing rights | 0 | 0 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury and Government Agencies [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 120,733 | 126,910 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 123,729 | 124,488 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 297,591 | 250,819 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Debt Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 502 | 501 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Equity securities at fair value | 1,528 | 1,173 |
Mortgage servicing rights | 3,390 | 3,607 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury and Government Agencies [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 0 | 0 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and Political Subdivisions [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 0 | 0 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 0 | 0 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Debt Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Securities available-for-sale | 0 | 0 |
Recurring [Member] | Equity Securities [Member] |  |  |
Reconciliation of beginning and ending balances of recurring fair value measurements recognized in balance sheet using significant unobservable (Level 3) inputs [Roll Forward] |  |  |
Beginning balance | 1,173 |  | 0
Total unrealized gains (losses) Included in net income | 355 |  | 0
Issues | 0 |  | 0
Settlements | 0 |  | 0
Ending balance | 1,528 | 1,173 | 0
Total gains (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date | 355 |  | 0
Recurring [Member] | Mortgage Servicing Rights [Member] |  |  |
Reconciliation of beginning and ending balances of recurring fair value measurements recognized in balance sheet using significant unobservable (Level 3) inputs [Roll Forward] |  |  |
Beginning balance | 3,607 |  | 3,484
Total unrealized gains (losses) Included in net income | (234) |  | 228
Issues | 116 |  | 100
Settlements | (99) |  | (106)
Ending balance | 3,390 | 3,607 | 3,706
Total gains (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date | (234) |  | 228
Nonrecurring [Member] |  |  |
Transfers between Levels [Abstract] |  |  |
Transfers from Level 1 to Level 2 | 0 |  |
Transfers from Level 2 to Level 1 | 0 |  |
Transfers into Level 3 | 0 |  |
Transfers out of Level 3 | 0 |  |
Impaired loan (collateral dependent) [Abstract] |  |  |
Impaired loans, fair value adjustments | 400 | 300 | 0
Other real estate owned [Abstract] |  |  |
Other real estate owned, fair value adjustment | 400 | 400 | $ 500
Nonrecurring [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Impaired loans (collateral dependent) | 1,078 | 747 |
Other real estate owned | 2,345 | 6,500 |
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Impaired loans (collateral dependent) | 0 | 0 |
Other real estate owned | 0 | 0 |
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Impaired loans (collateral dependent) | 0 | 0 |
Other real estate owned | 0 | 0 |
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Impaired loans (collateral dependent) | 1,078 | 747 |
Other real estate owned | $ 2,345 | $ 6,500 |

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents mortgage servicing right at fair value. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents other real estate owned at fair value. + References No definition available. + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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