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Fair Market Value of Financial Assets and Liabilities, Estimated Fair Value of Financial Instruments and Indication of Level Within Fair Value Hierarchy of Valuation Techniques (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Financial assets [Abstract] |  |  |  |
Securities available-for-sale | $ 593,746 | $ 585,761 |  |
Securities held-to-maturity | 649 | 660 |  |
Equity securities at fair value | 1,173 | 0 |  |
Mortgage servicing rights | 3,607 | 3,484 | $ 3,433 | $ 3,236
Carrying Amount [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Cash and cash equivalents | 141,450 | 175,274 |  |
Certificates of deposits in other banks | 3,920 | 9,800 |  |
Securities available-for-sale | 593,746 | 585,761 |  |
Securities held-to-maturity | 649 | 659 |  |
Equity securities at fair value | 1,173 |  |  |
Loans held for sale | 2,461 | 1,033 |  |
Loans, net | 3,172,730 | 3,086,789 |  |
Federal Home Loan Bank stock | 14,713 | 17,927 |  |
Federal Reserve Bank stock | 4,887 | 4,887 |  |
Accrued interest receivable | 14,432 | 13,338 |  |
Mortgage servicing rights | 3,607 | 3,484 |  |
Financial liabilities [Abstract] |  |  |  |
Deposits | 3,305,950 | 3,263,863 |  |
Repurchase agreements | 232,712 | 243,814 |  |
Federal funds purchased | 1,180 | 7,312 |  |
Advances from Federal Home Loan Bank | 436 | 845 |  |
Long-term debt | 59,341 | 59,341 |  |
Accrued interest payable | 2,902 | 2,228 |  |
Unrecognized financial instruments [Abstract] |  |  |  |
Letters of credit | 0 | 0 |  |
Commitments to extend credit | 0 | 0 |  |
Forward sale commitments | 0 | 0 |  |
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Cash and cash equivalents | 141,450 | 175,274 |  |
Certificates of deposits in other banks | 0 | 0 |  |
Securities available-for-sale | 91,028 | 88,956 |  |
Securities held-to-maturity | 0 | 0 |  |
Equity securities at fair value | 0 |  |  |
Loans held for sale | 2,518 | 1,060 |  |
Loans, net | 0 | 0 |  |
Federal Home Loan Bank stock | 0 | 0 |  |
Federal Reserve Bank stock | 0 | 0 |  |
Accrued interest receivable | 0 | 0 |  |
Mortgage servicing rights | 0 | 0 |  |
Financial liabilities [Abstract] |  |  |  |
Deposits | 803,316 | 790,930 |  |
Repurchase agreements | 0 | 0 |  |
Federal funds purchased | 0 | 0 |  |
Advances from Federal Home Loan Bank | 0 | 0 |  |
Long-term debt | 0 | 0 |  |
Accrued interest payable | 0 | 0 |  |
Unrecognized financial instruments [Abstract] |  |  |  |
Letters of credit | 0 | 0 |  |
Commitments to extend credit | 0 | 0 |  |
Forward sale commitments | 0 | 0 |  |
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Certificates of deposits in other banks | 3,914 | 9,772 |  |
Securities available-for-sale | 502,718 | 496,805 |  |
Securities held-to-maturity | 649 | 660 |  |
Equity securities at fair value | 0 |  |  |
Loans held for sale | 0 | 0 |  |
Loans, net | 0 | 0 |  |
Federal Home Loan Bank stock | 14,713 | 17,927 |  |
Federal Reserve Bank stock | 4,887 | 4,887 |  |
Accrued interest receivable | 14,432 | 13,338 |  |
Mortgage servicing rights | 0 | 0 |  |
Financial liabilities [Abstract] |  |  |  |
Deposits | 2,513,084 | 2,319,278 |  |
Repurchase agreements | 0 | 0 |  |
Federal funds purchased | 1,180 | 7,312 |  |
Advances from Federal Home Loan Bank | 468 | 841 |  |
Long-term debt | 0 | 0 |  |
Accrued interest payable | 2,902 | 2,228 |  |
Unrecognized financial instruments [Abstract] |  |  |  |
Letters of credit | 0 | 0 |  |
Commitments to extend credit | 0 | 0 |  |
Forward sale commitments | 0 | 0 |  |
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Financial assets [Abstract] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Certificates of deposits in other banks | 0 | 0 |  |
Securities available-for-sale | 0 | 0 |  |
Securities held-to-maturity | 0 | 0 |  |
Equity securities at fair value | 1,173 |  |  |
Loans held for sale | 0 | 0 |  |
Loans, net | 3,175,908 | 3,092,437 |  |
Federal Home Loan Bank stock | 0 | 0 |  |
Federal Reserve Bank stock | 0 | 0 |  |
Accrued interest receivable | 0 | 0 |  |
Mortgage servicing rights | 3,607 | 3,484 |  |
Financial liabilities [Abstract] |  |  |  |
Deposits | 0 | 0 |  |
Repurchase agreements | 232,796 | 243,932 |  |
Federal funds purchased | 0 | 0 |  |
Advances from Federal Home Loan Bank | 0 | 0 |  |
Long-term debt | 44,166 | 44,166 |  |
Accrued interest payable | 0 | 0 |  |
Unrecognized financial instruments [Abstract] |  |  |  |
Letters of credit | 0 | 0 |  |
Commitments to extend credit | 0 | 0 |  |
Forward sale commitments | $ 0 | $ 0 |  |

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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 the certificates of deposits in other bank asset. + 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 commitments to extend credit 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 forward sale commitments of the balance sheet date. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + 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 Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References No definition available. + Details
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- Definition Fair value portion of borrowing from Federal Home Loan Bank (FHLBank). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + References No definition available. + Details
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- Definition The fair value amount of long-term debt 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. + References No definition available. + Details
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