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Fair Market Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | $ 740,479 | $ 599,844 |  | $ 740,479 |  | $ 599,844
Equity securities at fair value | 2,094 | 1,953 |  | 2,094 |  | 1,953
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Collateral dependent loans | 3,030 |  |  | 3,030 |  |
Impaired loans |  | 3,217 |  |  |  | 3,217
Reconciliation of beginning and ending balances of recurring fair value measurements recognized in balance sheet using significant unobservable (Level 3) inputs [Roll Forward] |  |  |  |  |  |
Total losses | (6) |  | $ (263) | $ (1,165) | $ (241) |
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 | 89,432 | 171,150 |  | $ 89,432 |  | 171,150
State and Political Subdivisions [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 125,918 | 102,307 |  | 125,918 |  | 102,307
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 469,955 | 295,245 |  | 469,955 |  | 295,245
Other Debt Securities [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 55,174 | 31,142 |  | 55,174 |  | 31,142
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 | 3,498 | 54,263 |  | 3,498 |  | 54,263
Equity securities at fair value | 0 | 0 |  | 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 | 736,981 | 545,581 |  | 736,981 |  | 545,581
Equity securities at fair value | 0 | 0 |  | 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 |  | 0 |  | 0
Equity securities at fair value | 2,094 | 1,953 |  | 2,094 |  | 1,953
Recurring [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Equity securities at fair value | 2,094 | 1,953 |  | 2,094 |  | 1,953
Mortgage servicing rights | 2,518 | 3,263 |  | 2,518 |  | 3,263
Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 89,432 | 171,150 |  | 89,432 |  | 171,150
Recurring [Member] | State and Political Subdivisions [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 125,918 | 102,307 |  | 125,918 |  | 102,307
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 | 469,955 | 295,245 |  | 469,955 |  | 295,245
Recurring [Member] | Other Debt Securities [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 55,174 | 31,142 |  | 55,174 |  | 31,142
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 |  | 0 |  | 0
Mortgage servicing rights | 0 | 0 |  | 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 | 3,498 | 54,263 |  | 3,498 |  | 54,263
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 |  | 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 |  | 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 |  | 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 |  | 0 |  | 0
Mortgage servicing rights | 0 | 0 |  | 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 | 85,934 | 116,887 |  | 85,934 |  | 116,887
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 | 125,918 | 102,307 |  | 125,918 |  | 102,307
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 | 469,955 | 295,245 |  | 469,955 |  | 295,245
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 | 55,174 | 31,142 |  | 55,174 |  | 31,142
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Equity securities at fair value | 2,094 | 1,953 |  | 2,094 |  | 1,953
Mortgage servicing rights | 2,518 | 3,263 |  | 2,518 |  | 3,263
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 |  | 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 |  | 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 |  | 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 |  | 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 | 1,721 |  | 1,528 | 1,953 | 1,173 | 1,173
Total unrealized gains (losses) included in net income | 373 |  | 199 | 141 | 554 |
Issues | 0 |  | 0 | 0 | 0 |
Settlements | 0 |  | 0 | 0 | 0 |
Ending balance | 2,094 | 1,953 | 1,727 | 2,094 | 1,727 | 1,953
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 | 373 |  | 199 | 141 | 554 |
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 | 2,481 |  | 3,390 | 3,263 | 3,607 | 3,607
Total unrealized gains (losses) included in net income | (148) |  | (348) | (966) | (582) |
Issues | 415 |  | 191 | 560 | 307 |
Settlements | (230) |  | (114) | (339) | (213) |
Ending balance | 2,518 | 3,263 | 3,119 | 2,518 | 3,119 | 3,263
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 | (148) |  | (348) | (966) | (582) |
Nonrecurring [Member] |  |  |  |  |  |
Impaired loan (collateral dependent) [Abstract] |  |  |  |  |  |
Fair value adjustments on collateral dependent loans | 900 | 400 | 200 | 1,400 | 500 | 700
Other real estate owned [Abstract] |  |  |  |  |  |
Other real estate owned, fair value adjustment | 200 | 700 | $ 600 | 700 | $ 1,000 | 3,200
Nonrecurring [Member] | Fair Value [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Collateral dependent loans | 3,030 |  |  | 3,030 |  |
Impaired loans |  | 3,217 |  |  |  | 3,217
Other real estate owned | 1,692 | 12,593 |  | 1,692 |  | 12,593
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 |  |
Impaired loans |  | 0 |  |  |  | 0
Other real estate owned | 0 | 0 |  | 0 |  | 0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  | 0 |  |
Impaired loans |  | 0 |  |  |  | 0
Other real estate owned | 0 | 0 |  | 0 |  | 0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Collateral dependent loans | 3,030 |  |  | 3,030 |  |
Impaired loans |  | 3,217 |  |  |  | 3,217
Other real estate owned | $ 1,692 | $ 12,593 |  | $ 1,692 |  | $ 12,593

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