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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, 2023
Dec. 31, 2022
Assets:    
Available-for-Sale: Fair Value $ 2,387,324 $ 2,844,823
Loans Held for Sale 1,450 1,035
Debt Securities Issued by States and Political Subdivisions    
Assets:    
Available-for-Sale: Fair Value 60,602 95,265
Debt Securities Issued by Government-Sponsored Enterprises    
Assets:    
Available-for-Sale: Fair Value 1,640 48,628
Debt Securities Issued by Corporations    
Assets:    
Available-for-Sale: Fair Value 649,140 794,658
Residential - Government Agencies    
Assets:    
Available-for-Sale: Fair Value 631,947 732,828
Residential - U.S. Government-Sponsored Enterprises    
Assets:    
Available-for-Sale: Fair Value 699,349 793,871
Mortgage-Backed Securities    
Assets:    
Available-for-Sale: Fair Value 1,462,486 1,672,366
Commercial - Government Agencies or Sponsored Agencies    
Assets:    
Available-for-Sale: Fair Value 131,190 145,667
Fair Value, Measurements, Recurring    
Assets:    
Available-for-Sale: Fair Value 2,387,324 2,844,823
Loans Held for Sale 1,450 1,035
Mortgage Servicing Rights 685 717
Other Assets 51,435 47,755
Derivatives 210,734 47,717
Total Assets Measured at Fair Value on a Recurring Basis 2,651,628 2,942,047
Liabilities:    
Derivatives $ 202,397 $ 168,037
Derivative Liability Statement Of Financial Position [ExtensibleEnumeration] Other Liabilities Other Liabilities
Total Liabilities Measured at Fair Value on a Recurring Basis $ 202,397 $ 168,037
Fair Value, Measurements, Recurring | Debt Securities Issued by the U.S. Treasury and Government Agencies    
Assets:    
Available-for-Sale: Fair Value 213,456 233,906
Fair Value, Measurements, Recurring | Debt Securities Issued by States and Political Subdivisions    
Assets:    
Available-for-Sale: Fair Value 60,602 95,265
Fair Value, Measurements, Recurring | Debt Securities Issued by Government-Sponsored Enterprises    
Assets:    
Available-for-Sale: Fair Value 1,640 48,628
Fair Value, Measurements, Recurring | Debt Securities Issued by Corporations    
Assets:    
Available-for-Sale: Fair Value 649,140 794,658
Fair Value, Measurements, Recurring | Residential - Government Agencies    
Assets:    
Available-for-Sale: Fair Value 631,947 732,828
Fair Value, Measurements, Recurring | Residential - U.S. Government-Sponsored Enterprises    
Assets:    
Available-for-Sale: Fair Value 699,349 793,871
Fair Value, Measurements, Recurring | Commercial - Government Agencies    
Assets:    
Available-for-Sale: Fair Value 131,190  
Fair Value, Measurements, Recurring | Mortgage-Backed Securities    
Assets:    
Available-for-Sale: Fair Value 1,462,486 1,672,366
Fair Value, Measurements, Recurring | Commercial - Government Agencies or Sponsored Agencies    
Assets:    
Available-for-Sale: Fair Value   145,667
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)    
Assets:    
Available-for-Sale: Fair Value 142,059 141,944
Loans Held for Sale 0 0
Mortgage Servicing Rights 0 0
Other Assets 51,435 47,755
Derivatives 0 0
Total Assets Measured at Fair Value on a Recurring Basis 193,494 189,699
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 142,059 141,944
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 2,245,265 2,702,879
Loans Held for Sale 1,450 1,035
Mortgage Servicing Rights 0 0
Other Assets 0 0
Derivatives 71 1,822
Total Assets Measured at Fair Value on a Recurring Basis 2,246,786 2,705,736
Liabilities:    
Derivatives $ 0 $ 70
Derivative Liability Statement Of Financial Position [ExtensibleEnumeration] Other Liabilities Other Liabilities
Total Liabilities Measured at Fair Value on a Recurring Basis $ 0 $ 70
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 71,397 91,962
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by States and Political Subdivisions    
Assets:    
Available-for-Sale: Fair Value 60,602 95,265
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Government-Sponsored Enterprises    
Assets:    
Available-for-Sale: Fair Value 1,640 48,628
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Corporations    
Assets:    
Available-for-Sale: Fair Value 649,140 794,658
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - Government Agencies    
Assets:    
Available-for-Sale: Fair Value 631,947 732,828
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - U.S. Government-Sponsored Enterprises    
Assets:    
Available-for-Sale: Fair Value 699,349 793,871
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Government Agencies    
Assets:    
Available-for-Sale: Fair Value 131,190  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Backed Securities    
Assets:    
Available-for-Sale: Fair Value 1,462,486 1,672,366
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 685 717
Other Assets 0 0
Derivatives 210,663 45,895
Total Assets Measured at Fair Value on a Recurring Basis 211,348 46,612
Liabilities:    
Derivatives $ 202,394 $ 167,967
Derivative Liability Statement Of Financial Position [ExtensibleEnumeration] Other Liabilities Other Liabilities
Total Liabilities Measured at Fair Value on a Recurring Basis $ 202,394 $ 167,967
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