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Fair Value of Assets and Liabilities, Part II (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Mortgage Servicing Rights (MSR) Impairment (Recovery) | $ 439,000 |  |  |
Foreclosed Assets Held for Sale [Abstract] |  |  |  |
Other real estate owned | 3,569,000 | $ 2,534,000 |  |
Financial Assets [Abstract] |  |  |  |
Available-for-sale securities | 757,690,000 | 692,274,000 |  |
Debt Securities, Held-to-maturity | 69,488,000 | 69,436,000 |  |
Debt Securities, Held-to-maturity, Fair Value | 69,441,000 | 67,909,000 |  |
Operating lease right-of-use assets | 12,805,000 | 0 |  |
Financial Liabilities [Abstract] |  |  |  |
Operating lease liabilities | 12,815,000 | 0 |  |
Carrying Amount [Member] |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and due from banks | 167,497,000 | 140,735,000 |  |
Federal funds sold | 919,000 | 665,000 |  |
Certificates of deposit investments | 6,585,000 | 7,569,000 |  |
Available-for-sale securities | 757,690,000 | 692,274,000 |  |
Debt Securities, Held-to-maturity | 69,488,000 | 69,436,000 |  |
Loans held for sale | 1,717,000 | 1,508,000 |  |
Loans net of allowance for loan losses | 2,518,467,000 | 2,616,822,000 |  |
Interest receivable | 15,650,000 | 16,881,000 |  |
Federal Reserve Bank stock | 9,401,000 | 7,390,000 |  |
Federal Home Loan Bank stock | 2,995,000 | 3,095,000 |  |
Financial Liabilities [Abstract] |  |  |  |
Deposits | 3,012,490,000 | 2,988,686,000 |  |
Securities sold under agreements to repurchase | 152,264,000 | 192,330,000 |  |
Interest payable | 2,416,000 | 1,758,000 |  |
Federal Home Loan Bank borrowings | 95,826,000 | 119,745,000 |  |
Other borrowings |  | 7,724,000 |  |
Junior subordinated debentures | 29,084,000 | 29,000,000 |  |
Fair Value [Member] |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and due from banks | 167,497,000 | 140,735,000 |  |
Federal funds sold | 919,000 | 665,000 |  |
Certificates of deposit investments | 6,585,000 | 7,569,000 |  |
Available-for-sale securities | 757,690,000 | 692,274,000 |  |
Debt Securities, Held-to-maturity, Fair Value | 69,441,000 | 67,909,000 |  |
Loans held for sale | 1,717,000 | 1,508,000 |  |
Loans net of allowance for loan losses | 2,451,641,000 | 2,541,037,000 |  |
Interest receivable | 15,650,000 | 16,881,000 |  |
Federal Reserve Bank stock | 9,401,000 | 7,390,000 |  |
Federal Home Loan Bank stock | 2,995,000 | 3,095,000 |  |
Financial Liabilities [Abstract] |  |  |  |
Deposits | 3,018,325,000 | 2,991,177,000 |  |
Securities sold under agreements to repurchase | 152,257,000 | 192,179,000 |  |
Interest payable | 2,416,000 | 1,758,000 |  |
Federal Home Loan Bank borrowings | 96,503,000 | 119,704,000 |  |
Other borrowings |  | 7,724,000 |  |
Junior subordinated debentures | 24,199,000 | 24,418,000 |  |
Fair Value, Measurements, Nonrecurring [Member] | Carrying Amount [Member] |  |  |  |
Foreclosed Assets Held for Sale [Abstract] |  |  |  |
Other real estate owned | 3,569,000 |  |  |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member] |  |  |  |
Foreclosed Assets Held for Sale [Abstract] |  |  |  |
Other real estate owned | 1,479,000 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and due from banks | 167,497,000 | 140,735,000 |  |
Federal funds sold | 919,000 | 665,000 |  |
Available-for-sale securities | 190,000 | 364,000 |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0 |  |
Loans held for sale | 0 | 0 |  |
Loans net of allowance for loan losses | 0 | 0 |  |
Interest receivable | 0 | 0 |  |
Federal Reserve Bank stock | 0 | 0 |  |
Federal Home Loan Bank stock | 0 | 0 |  |
Financial Liabilities [Abstract] |  |  |  |
Deposits | 0 | 0 |  |
Securities sold under agreements to repurchase | 0 | 0 |  |
Interest payable | 0 | 0 |  |
Federal Home Loan Bank borrowings | 0 | 0 |  |
Other borrowings |  | 0 |  |
Junior subordinated debentures | 0 | 0 |  |
Significant Other Observable Inputs (Level 2) |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and due from banks | 0 | 0 |  |
Federal funds sold | 0 | 0 |  |
Certificates of deposit investments | 6,585,000 | 7,569,000 |  |
Available-for-sale securities | 756,530,000 | 690,943,000 |  |
Debt Securities, Held-to-maturity, Fair Value | 69,441,000 | 67,909,000 |  |
Loans held for sale | 1,717,000 | 1,508,000 |  |
Loans net of allowance for loan losses | 0 | 0 |  |
Interest receivable | 15,650,000 | 16,881,000 |  |
Federal Reserve Bank stock | 9,401,000 | 7,390,000 |  |
Federal Home Loan Bank stock | 2,995,000 | 3,095,000 |  |
Financial Liabilities [Abstract] |  |  |  |
Deposits | 2,360,683,000 | 2,396,917,000 |  |
Securities sold under agreements to repurchase | 152,257,000 | 192,179,000 |  |
Interest payable | 2,416,000 | 1,758,000 |  |
Federal Home Loan Bank borrowings | 96,503,000 | 119,704,000 |  |
Other borrowings |  | 7,724,000 |  |
Junior subordinated debentures | 24,199,000 | 24,418,000 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Financial Assets [Abstract] |  |  |  |
Cash and due from banks | 0 | 0 |  |
Federal funds sold | 0 | 0 |  |
Available-for-sale securities | 970,000 | 967,000 |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0 |  |
Loans held for sale | 0 | 0 |  |
Loans net of allowance for loan losses | 2,451,641,000 | 2,541,037,000 |  |
Interest receivable | 0 | 0 |  |
Federal Reserve Bank stock | 0 | 0 |  |
Federal Home Loan Bank stock | 0 | 0 |  |
Financial Liabilities [Abstract] |  |  |  |
Deposits | 657,642,000 | 594,260,000 |  |
Securities sold under agreements to repurchase | 0 | 0 |  |
Interest payable | 0 | 0 |  |
Federal Home Loan Bank borrowings | 0 | 0 |  |
Other borrowings |  | 0 |  |
Junior subordinated debentures | 0 | 0 |  |
Impaired loans (collateral dependent) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Assets, Fair Value Disclosure | 10,028,000 | 16,437,000 |  |
Impaired loans (collateral dependent) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Assets, Fair Value Disclosure | 0 | 0 |  |
Impaired loans (collateral dependent) | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 0 | $ 0 |  |
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Minimum [Member] | Third Party Valuations [Member] |  |  |  |
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract] |  |  |  |
Discount to reflect realizable value | 0.00% | 0.00% |  |
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Maximum [Member] | Third Party Valuations [Member] |  |  |  |
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract] |  |  |  |
Discount to reflect realizable value | 40.00% | 40.00% |  |
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Weighted Average [Member] | Third Party Valuations [Member] |  |  |  |
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract] |  |  |  |
Discount to reflect realizable value | 20.00% | 20.00% |  |
Impaired loans (collateral dependent) | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 10,028,000 | $ 16,437,000 |  |
Assets Held-for-sale [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Assets, Fair Value Disclosure | 1,479,000 | 836,000 |  |
Assets Held-for-sale [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Assets, Fair Value Disclosure | 0 | 0 |  |
Assets Held-for-sale [Member] | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 0 | $ 0 |  |
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Minimum [Member] | Third Party Valuations [Member] |  |  |  |
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract] |  |  |  |
Discount to reflect realizable value less estimated selling costs (in hundredths) | 0.00% | 0.00% |  |
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Maximum [Member] | Third Party Valuations [Member] |  |  |  |
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract] |  |  |  |
Discount to reflect realizable value less estimated selling costs (in hundredths) | 40.00% | 40.00% |  |
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Weighted Average [Member] | Third Party Valuations [Member] |  |  |  |
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract] |  |  |  |
Discount to reflect realizable value less estimated selling costs (in hundredths) | 35.00% | 35.00% |  |
Assets Held-for-sale [Member] | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Assets, Fair Value Disclosure | $ 1,479,000 | $ 836,000 |  |
Mortgage Servicing Rights [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Mortgage Servicing Rights (MSR) Impairment (Recovery) | 439,000 |  |  |
Finite-Lived Intangible Assets, Net | 1,636,000 | $ 2,101,000 | $ 1,157,000 | $ 844,000
Mortgage Servicing Rights [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | 1,636,000 |  |  |
Indefinite-Lived Contractual Rights | 2,075,000 |  |  |
Mortgage Servicing Rights [Member] | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 0 |  |  |
Mortgage Servicing Rights [Member] | Significant Unobservable Inputs (Level 3) | Minimum [Member] | Third Party Valuations [Member] |  |  |  |
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract] |  |  |  |
Discount to reflect realizable value | 9.50% |  |  |
Mortgage Servicing Rights [Member] | Significant Unobservable Inputs (Level 3) | Maximum [Member] | Third Party Valuations [Member] |  |  |  |
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract] |  |  |  |
Discount to reflect realizable value | 12.50% |  |  |
Mortgage Servicing Rights [Member] | Significant Unobservable Inputs (Level 3) | Weighted Average [Member] | Third Party Valuations [Member] |  |  |  |
Assets Measured On Recurring And Nonrecurring Basis Valuation Techniques [Abstract] |  |  |  |
Discount to reflect realizable value | 9.70% |  |  |

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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 includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. + 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 element represents the fair value of interest payable. + 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 interest receivable from third parties. + 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 amount shown on an entity's books for investments in Federal Reserve Bank stock. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of federal funds sold and securities borrowed or purchased under agreements to resell. + 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 Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + 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 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + 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 Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date of rights with an indefinite period of benefit that arose from a contractual arrangement with a third party (not including franchise rights and license agreements). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + 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 Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + 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 (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + 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 Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + 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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- Definition The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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