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Fair Market Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | $ 591,586 | $ 593,746 |  | $ 591,586 |  | $ 593,746
Equity securities at fair value | 1,727 | 1,173 |  | 1,727 |  | 1,173
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Impaired loans (collateral dependent) | 1,343 | 747 |  | 1,343 |  | 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 (losses) | (263) |  | $ (45) | $ (241) | $ 77 |
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 | 150,742 | 217,938 |  | $ 150,742 |  | 217,938
State and Political Subdivisions [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 105,439 | 124,488 |  | 105,439 |  | 124,488
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 333,005 | 250,819 |  | 333,005 |  | 250,819
Other Debt Securities [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 2,400 | 501 |  | 2,400 |  | 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 | 35,668 | 91,028 |  | 35,668 |  | 91,028
Equity securities at fair value | 0 | 0 |  | 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 | 555,918 | 502,718 |  | 555,918 |  | 502,718
Equity securities at fair value | 0 | 0 |  | 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 |  | 0 |  | 0
Equity securities at fair value | 1,727 | 1,173 |  | 1,727 |  | 1,173
Recurring [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Equity securities at fair value | 1,727 | 1,173 |  | 1,727 |  | 1,173
Mortgage servicing rights | 3,119 | 3,607 |  | 3,119 |  | 3,607
Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 150,742 | 217,938 |  | 150,742 |  | 217,938
Recurring [Member] | State and Political Subdivisions [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 105,439 | 124,488 |  | 105,439 |  | 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 | 333,005 | 250,819 |  | 333,005 |  | 250,819
Recurring [Member] | Other Debt Securities [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Securities available-for-sale | 2,400 | 501 |  | 2,400 |  | 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 |  | 0 |  | 0
Mortgage servicing rights | 0 | 0 |  | 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 | 35,668 | 91,028 |  | 35,668 |  | 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 |  | 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 |  | 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 |  | 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 |  | 0 |  | 0
Mortgage servicing rights | 0 | 0 |  | 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 | 115,074 | 126,910 |  | 115,074 |  | 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 | 105,439 | 124,488 |  | 105,439 |  | 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 | 333,005 | 250,819 |  | 333,005 |  | 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 | 2,400 | 501 |  | 2,400 |  | 501
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Equity securities at fair value | 1,727 | 1,173 |  | 1,727 |  | 1,173
Mortgage servicing rights | 3,119 | 3,607 |  | 3,119 |  | 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 |  | 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 |  | 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 |  | 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 |  | 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 | 1,528 |  | 0 | 1,173 | 0 | 0
Total unrealized gains (losses) Included in net income | 199 |  | 0 | 554 | 0 |
Issues | 0 |  | 0 | 0 | 0 |
Settlements | 0 |  | 0 | 0 | 0 |
Ending balance | 1,727 | 1,173 | 0 | 1,727 | 0 | 1,173
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 | 199 |  | 0 | 554 | 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 | 3,390 |  | 3,706 | 3,607 | 3,484 | 3,484
Total unrealized gains (losses) Included in net income | (348) |  | 68 | (582) | 296 |
Issues | 191 |  | 111 | 307 | 211 |
Settlements | (114) |  | (113) | (213) | (219) |
Ending balance | 3,119 | 3,607 | 3,772 | 3,119 | 3,772 | 3,607
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 | (348) |  | 68 | (582) | 296 |
Nonrecurring [Member] |  |  |  |  |  |
Transfers between Levels [Abstract] |  |  |  |  |  |
Transfers from Level 1 to Level 2 | 0 |  |  | 0 |  |
Transfers from Level 2 to Level 1 | 0 |  |  | 0 |  |
Transfers into Level 3 |  |  |  | 0 |  |
Transfers out of Level 3 |  |  |  | 0 |  |
Impaired loan (collateral dependent) [Abstract] |  |  |  |  |  |
Impaired loans, fair value adjustments | 200 | 300 | 200 | 500 | 200 | 300
Other real estate owned [Abstract] |  |  |  |  |  |
Other real estate owned, fair value adjustment | 600 | 400 | $ 800 | 1,000 | $ 1,200 | 1,800
Nonrecurring [Member] | Fair Value [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Impaired loans (collateral dependent) | 1,343 | 747 |  | 1,343 |  | 747
Other real estate owned | 2,271 | 6,500 |  | 2,271 |  | 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 |  | 0 |  | 0
Other real estate owned | 0 | 0 |  | 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 |  | 0 |  | 0
Other real estate owned | 0 | 0 |  | 0 |  | 0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Impaired loans (collateral dependent) | 1,343 | 747 |  | 1,343 |  | 747
Other real estate owned | $ 2,271 | $ 6,500 |  | $ 2,271 |  | $ 6,500

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- Definition This element represents the fair value disclosure of impaired loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date. + 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 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 The frequency of periodic reviews for appraisals on foreclosed properties and other real estate owned generally, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: 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=118954083&loc=d3e26610-111562 Reference 3: 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=118939692&loc=d3e27161-111563 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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=118932676&loc=d3e3602-108585 + Details
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