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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 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets [Abstract] |  |
Available-for-sale securities | $ 610,368 | $ 605,394
Securities held-to-maturity | 858 | 867
Mortgage servicing rights | 3,304 | 3,433
Carrying Amount [Member] |  |
Financial assets [Abstract] |  |
Cash and cash equivalents | 127,830 | 144,716
Certificates of deposits in other banks | 12,260 | 980
Available-for-sale securities | 610,368 | 605,394
Securities held-to-maturity | 858 | 866
Loans held for sale | 4,624 | 1,244
Loans, net | 3,050,209 | 2,902,438
Federal Home Loan Bank stock | 17,927 | 17,927
Federal Reserve Bank stock | 4,887 | 4,887
Accrued interest receivable | 11,329 | 11,922
Mortgage servicing rights | 3,304 | 3,433
Financial liabilities [Abstract] |  |
Deposits | 3,105,610 | 3,081,308
Repurchase agreements | 257,208 | 251,065
Federal funds purchased | 7,220 | 4,816
Advances from Federal Home Loan Bank | 100,894 | 944
Long-term debt | 59,341 | 61,341
Accrued interest payable | 2,137 | 1,200
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 | 127,830 | 144,716
Certificates of deposits in other banks | 0 | 0
Available-for-sale securities | 104,691 | 69,292
Securities held-to-maturity | 0 | 0
Loans held for sale | 4,727 | 1,260
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 | 782,864 | 767,918
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 | 12,223 | 982
Available-for-sale securities | 505,677 | 536,102
Securities held-to-maturity | 858 | 867
Loans held for sale | 0 | 0
Loans, net | 0 | 0
Federal Home Loan Bank stock | 17,927 | 17,927
Federal Reserve Bank stock | 4,887 | 4,887
Accrued interest receivable | 11,329 | 11,922
Mortgage servicing rights | 0 | 0
Financial liabilities [Abstract] |  |
Deposits | 2,324,415 | 2,321,690
Repurchase agreements | 0 | 0
Federal funds purchased | 7,220 | 4,816
Advances from Federal Home Loan Bank | 100,895 | 1,009
Long-term debt | 0 | 0
Accrued interest payable | 2,137 | 1,200
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
Available-for-sale securities | 0 | 0
Securities held-to-maturity | 0 | 0
Loans held for sale | 0 | 0
Loans, net | 3,028,478 | 2,882,348
Federal Home Loan Bank stock | 0 | 0
Federal Reserve Bank stock | 0 | 0
Accrued interest receivable | 0 | 0
Mortgage servicing rights | 3,304 | 3,433
Financial liabilities [Abstract] |  |
Deposits | 0 | 0
Repurchase agreements | 257,148 | 250,820
Federal funds purchased | 0 | 0
Advances from Federal Home Loan Bank | 0 | 0
Long-term debt | 49,073 | 49,073
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 sum of advances from federal home loan bank liability. + 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 Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592 + 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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