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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, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | $ 1,357,597 | $ 997,261 |  | $ 1,357,597 |  | $ 997,261
Equity securities at fair value | 2,523 | 2,471 |  | 2,523 |  | 2,471
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Collateral dependent loans | 1,279 | 1,768 |  | 1,279 |  | 1,768
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) | (79) |  | $ (6) | $ 473 | $ (1,165) |
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 | 245,695 | 148,793 |  | $ 245,695 |  | 148,793
State and Political Subdivisions [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 261,577 | 140,416 |  | 261,577 |  | 140,416
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 757,750 | 651,807 |  | 757,750 |  | 651,807
Other Debt Securities [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 92,575 | 56,245 |  | 92,575 |  | 56,245
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 | 181,160 | 74,991 |  | 181,160 |  | 74,991
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 | 1,176,437 | 922,270 |  | 1,176,437 |  | 922,270
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 | 2,523 | 2,471 |  | 2,523 |  | 2,471
Recurring [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Equity securities at fair value | 2,523 | 2,471 |  | 2,523 |  | 2,471
Mortgage servicing rights | 5,899 | 4,068 |  | 5,899 |  | 4,068
Recurring [Member] | U.S. Treasury and Government Agencies [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 245,695 | 148,793 |  | 245,695 |  | 148,793
Recurring [Member] | State and Political Subdivisions [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 261,577 | 140,416 |  | 261,577 |  | 140,416
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 | 757,750 | 651,807 |  | 757,750 |  | 651,807
Recurring [Member] | Other Debt Securities [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Debt securities available-for-sale | 92,575 | 56,245 |  | 92,575 |  | 56,245
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 | 181,160 | 74,991 |  | 181,160 |  | 74,991
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 | 64,535 | 73,802 |  | 64,535 |  | 73,802
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 | 261,577 | 140,416 |  | 261,577 |  | 140,416
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 | 757,750 | 651,807 |  | 757,750 |  | 651,807
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 | 92,575 | 56,245 |  | 92,575 |  | 56,245
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |
Assets Measured at Fair Value on Recurring Basis [Abstract] |  |  |  |  |  |
Equity securities at fair value | 2,523 | 2,471 |  | 2,523 |  | 2,471
Mortgage servicing rights | 5,899 | 4,068 |  | 5,899 |  | 4,068
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 | 2,243 |  | 1,721 | 2,471 | 1,953 | 1,953
Total unrealized gains (losses) included in net income | 280 |  | 373 | 52 | 141 |
Issues | 0 |  | 0 | 0 | 0 |
Settlements | 0 |  | 0 | 0 | 0 |
Ending balance | 2,523 | 2,471 | 2,094 | 2,523 | 2,094 | 2,471
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 | 280 |  | 373 | 52 | 141 |
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 | 5,584 |  | 2,481 | 4,068 | 3,263 | 3,263
Total unrealized gains (losses) included in net income | (129) |  | (148) | 901 | (966) |
Issues | 674 |  | 415 | 1,410 | 560 |
Settlements | (230) |  | (230) | (480) | (339) |
Ending balance | 5,899 | 4,068 | 2,518 | 5,899 | 2,518 | 4,068
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 | (129) |  | (148) | 901 | (966) |
Nonrecurring [Member] |  |  |  |  |  |
Impaired loan (collateral dependent) [Abstract] |  |  |  |  |  |
Fair value adjustments on collateral dependent loans | 500 | 0 | 900 | 800 | 1,400 | 500
Other real estate owned [Abstract] |  |  |  |  |  |
Other real estate owned, fair value adjustment | 300 | 100 | $ 200 | 400 | $ 700 | 700
Nonrecurring [Member] | Fair Value [Member] |  |  |  |  |  |
Assets measured-nonrecurring basis [Abstract] |  |  |  |  |  |
Collateral dependent loans | 1,279 | 1,768 |  | 1,279 |  | 1,768
Other real estate owned | 1,424 | 2,395 |  | 1,424 |  | 2,395
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 |  | 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 |  | 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 | 1,279 | 1,768 |  | 1,279 |  | 1,768
Other real estate owned | $ 1,424 | $ 2,395 |  | $ 1,424 |  | $ 2,395

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