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Fair Value of Assets and Liabilities - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Available-for-Sale: Fair Value | $ 2,550,324 | $ 2,408,933
Loans Held for Sale | 5,048 | 3,124
Debt Securities Issued by States and Political Subdivisions |  |
Assets: |  |
Available-for-Sale: Fair Value | 65,845 | 63,806
Debt Securities Issued by Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,464 | 1,476
Debt Securities Issued by Corporations |  |
Assets: |  |
Available-for-Sale: Fair Value | 673,391 | 657,701
Residential - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 648,589 | 629,327
Residential - U.S. Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 687,820 | 709,127
Mortgage-Backed Securities |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,580,595 | 1,473,377
Commercial - Government Agencies or Sponsored Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 244,186 | 134,923
Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-Sale: Fair Value | 2,550,324 | 2,408,933
Loans Held for Sale | 5,048 | 3,124
Mortgage Servicing Rights | 660 | 678
Other Assets | 19,982 | 13,448
Derivatives | 74,414 | 95,069
Total Assets Measured at Fair Value on a Recurring Basis | 2,650,428 | 2,521,252
Liabilities: |  |
Derivatives | $ 115,092 | $ 143,857
Derivative Liability Statement Of Financial Position [ExtensibleEnumeration] | Other Liabilities | Other Liabilities
Total Liabilities Measured at Fair Value on a Recurring Basis | $ 115,092 | $ 143,857
Fair Value, Measurements, Recurring | Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 229,029 | 212,573
Fair Value, Measurements, Recurring | Debt Securities Issued by States and Political Subdivisions |  |
Assets: |  |
Available-for-Sale: Fair Value | 65,845 | 63,806
Fair Value, Measurements, Recurring | Debt Securities Issued by Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,464 | 1,476
Fair Value, Measurements, Recurring | Debt Securities Issued by Corporations |  |
Assets: |  |
Available-for-Sale: Fair Value | 673,391 | 657,701
Fair Value, Measurements, Recurring | Residential - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 648,589 | 629,327
Fair Value, Measurements, Recurring | Residential - U.S. Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 687,820 | 709,127
Fair Value, Measurements, Recurring | Commercial - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 244,186 |
Fair Value, Measurements, Recurring | Mortgage-Backed Securities |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,580,595 | 1,473,377
Fair Value, Measurements, Recurring | Commercial - Government Agencies or Sponsored Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value |  | 134,923
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) |  |
Assets: |  |
Available-for-Sale: Fair Value | 150,910 | 146,214
Loans Held for Sale | 0 | 0
Mortgage Servicing Rights | 0 | 0
Other Assets | 19,982 | 13,448
Derivatives | 0 | 0
Total Assets Measured at Fair Value on a Recurring Basis | 170,892 | 159,662
Liabilities: |  |
Derivatives | $ 0 | $ 0
Derivative Liability Statement Of Financial Position [ExtensibleEnumeration] | Other Liabilities | Other Liabilities
Total Liabilities Measured at Fair Value on a Recurring Basis | $ 0 | $ 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 150,910 | 146,214
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by States and Political Subdivisions |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by Corporations |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Residential - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Residential - U.S. Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Commercial - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 |
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgage-Backed Securities |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Commercial - Government Agencies or Sponsored Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value |  | 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Available-for-Sale: Fair Value | 2,399,414 | 2,262,719
Loans Held for Sale | 5,048 | 3,124
Mortgage Servicing Rights | 0 | 0
Other Assets | 0 | 0
Derivatives | 74,256 | 94,921
Total Assets Measured at Fair Value on a Recurring Basis | 2,478,718 | 2,360,764
Liabilities: |  |
Derivatives | $ 115,086 | $ 143,857
Derivative Liability Statement Of Financial Position [ExtensibleEnumeration] | Other Liabilities | Other Liabilities
Total Liabilities Measured at Fair Value on a Recurring Basis | $ 115,086 | $ 143,857
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 78,119 | 66,359
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by States and Political Subdivisions |  |
Assets: |  |
Available-for-Sale: Fair Value | 65,845 | 63,806
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,464 | 1,476
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Corporations |  |
Assets: |  |
Available-for-Sale: Fair Value | 673,391 | 657,701
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 648,589 | 629,327
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - U.S. Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 687,820 | 709,127
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 244,186 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Backed Securities |  |
Assets: |  |
Available-for-Sale: Fair Value | 1,580,595 | 1,473,377
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Government Agencies or Sponsored Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value |  | 134,923
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Loans Held for Sale | 0 | 0
Mortgage Servicing Rights | 660 | 678
Other Assets | 0 | 0
Derivatives | 158 | 148
Total Assets Measured at Fair Value on a Recurring Basis | 818 | 826
Liabilities: |  |
Derivatives | $ 6 | $ 0
Derivative Liability Statement Of Financial Position [ExtensibleEnumeration] | Other Liabilities | Other Liabilities
Total Liabilities Measured at Fair Value on a Recurring Basis | $ 6 | $ 0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by the U.S. Treasury and Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by States and Political Subdivisions |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Debt Securities Issued by Corporations |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Residential - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Residential - U.S. Government-Sponsored Enterprises |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 | 0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Commercial - Government Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value | 0 |
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Mortgage-Backed Securities |  |
Assets: |  |
Available-for-Sale: Fair Value | $ 0 | 0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 3) | Commercial - Government Agencies or Sponsored Agencies |  |
Assets: |  |
Available-for-Sale: Fair Value |  | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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