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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 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial assets [Abstract] |  |
Securities available-for-sale | $ 599,299 | $ 593,746
Securities held-to-maturity | 619 | 649
Equity securities at fair value | 1,528 | 1,173
Mortgage servicing rights | 3,390 | 3,607
Carrying Amount [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 253,860 | 141,450
Certificates of deposits in other banks | 1,470 | 3,920
Securities available-for-sale | 599,299 | 593,746
Securities held-to-maturity | 619 | 649
Equity securities at fair value | 1,528 | 1,173
Loans held for sale | 13,649 | 2,461
Loans, net | 3,154,728 | 3,172,730
Federal Home Loan Bank stock | 12,261 | 14,713
Federal Reserve Bank stock | 4,887 | 4,887
Accrued interest receivable | 15,188 | 14,432
Mortgage servicing rights | 3,390 | 3,607
Financial liabilities [Abstract] |  |
Deposits | 3,383,103 | 3,305,950
Repurchase agreements | 237,506 | 232,712
Federal funds purchased | 1,800 | 1,180
Advances from Federal Home Loan Bank | 431 | 436
Long-term debt | 59,341 | 59,341
Accrued interest payable | 3,983 | 2,902
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 | 253,860 | 141,450
Certificates of deposits in other banks | 0 | 0
Securities available-for-sale | 56,744 | 91,028
Securities held-to-maturity | 0 | 0
Equity securities at fair value | 0 | 0
Loans held for sale | 13,752 | 2,518
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 | 841,996 | 803,316
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 | 1,470 | 3,914
Securities available-for-sale | 542,555 | 502,718
Securities held-to-maturity | 619 | 649
Equity securities at fair value | 0 | 0
Loans held for sale | 0 | 0
Loans, net | 0 | 0
Federal Home Loan Bank stock | 12,261 | 14,713
Federal Reserve Bank stock | 4,887 | 4,887
Accrued interest receivable | 15,188 | 14,432
Mortgage servicing rights | 0 | 0
Financial liabilities [Abstract] |  |
Deposits | 2,559,903 | 2,513,084
Repurchase agreements | 0 | 0
Federal funds purchased | 1,800 | 1,180
Advances from Federal Home Loan Bank | 461 | 468
Long-term debt | 0 | 0
Accrued interest payable | 3,983 | 2,902
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 | 1,528 | 1,173
Loans held for sale | 0 | 0
Loans, net | 3,150,772 | 3,175,908
Federal Home Loan Bank stock | 0 | 0
Federal Reserve Bank stock | 0 | 0
Accrued interest receivable | 0 | 0
Mortgage servicing rights | 3,390 | 3,607
Financial liabilities [Abstract] |  |
Deposits | 0 | 0
Repurchase agreements | 237,556 | 232,796
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 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 sum of trade and related party payables and accrued expenses as of the balance sheet date. + 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 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 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 Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits. + 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 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 loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + 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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