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Fair Market Value of Financial Assets and Liabilities (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | $ 1,155,195,000 | $ 997,261,000 |
Equity securities at fair value | 2,243,000 | 2,471,000 |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans | 563,000 | 1,768,000 |
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) | $ 552,000 |  | $ (1,159,000)
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] |  |  |
Debt securities available-for-sale | $ 203,619,000 | 148,793,000 |
State and Political Subdivisions [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 220,117,000 | 140,416,000 |
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 674,832,000 | 651,807,000 |
Other Debt Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 56,627,000 | 56,245,000 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 134,598,000 | 74,991,000 |
Equity securities at fair value | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 1,020,597,000 | 922,270,000 |
Equity securities at fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 0 | 0 |
Equity securities at fair value | 2,243,000 | 2,471,000 |
Recurring [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Equity securities at fair value | 2,243,000 | 2,471,000 |
Mortgage servicing rights | 5,584,000 | 4,068,000 |
Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 203,619,000 | 148,793,000 |
Recurring [Member] | State and Political Subdivisions [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 220,117,000 | 140,416,000 |
Recurring [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 674,832,000 | 651,807,000 |
Recurring [Member] | Other Debt Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 56,627,000 | 56,245,000 |
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 |
Mortgage servicing rights | 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] |  |  |
Debt securities available-for-sale | 134,598,000 | 74,991,000 |
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] |  |  |
Debt securities available-for-sale | 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] |  |  |
Debt securities available-for-sale | 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] |  |  |
Debt securities available-for-sale | 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 |
Mortgage servicing rights | 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] |  |  |
Debt securities available-for-sale | 69,021,000 | 73,802,000 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 220,117,000 | 140,416,000 |
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] |  |  |
Debt securities available-for-sale | 674,832,000 | 651,807,000 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Debt Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 56,627,000 | 56,245,000 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Equity securities at fair value | 2,243,000 | 2,471,000 |
Mortgage servicing rights | 5,584,000 | 4,068,000 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury and Government Agencies [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 0 | 0 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and Political Subdivisions [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 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] |  |  |
Debt securities available-for-sale | 0 | 0 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Debt Securities [Member] |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |
Debt securities available-for-sale | 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 | 2,471,000 |  | 1,953,000
Total unrealized gains (losses) included in net income | (228,000) |  | (232,000)
Issues | 0 |  | 0
Settlements | 0 |  | 0
Ending balance | 2,243,000 | 2,471,000 | 1,721,000
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 | (228,000) |  | (232,000)
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 | 4,068,000 |  | 3,263,000
Total unrealized gains (losses) included in net income | 1,030,000 |  | (818,000)
Issues | 736,000 |  | 144,000
Settlements | (250,000) |  | (108,000)
Ending balance | 5,584,000 | 4,068,000 | 2,481,000
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 | 1,030,000 |  | (818,000)
Nonrecurring [Member] |  |  |
Impaired loan (collateral dependent) [Abstract] |  |  |
Fair value adjustments on collateral dependent loans | 300,000 | 0.0 | 800,000
Other real estate owned [Abstract] |  |  |
Other real estate owned, fair value adjustment | 200,000 | 100,000 | $ 400,000
Nonrecurring [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans | 563,000 | 1,768,000 |
Other real estate owned | 530,000 | 2,395,000 |
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans | 0 | 0 |
Other real estate owned | 0 | 0 |
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans | 0 | 0 |
Other real estate owned | 0 | 0 |
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |
Collateral dependent loans | 563,000 | 1,768,000 |
Other real estate owned | $ 530,000 | $ 2,395,000 |

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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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