Fair Value of Assets and Liabilities - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Assets:
Available-for-Sale: Fair Value	$ 2,887,019	$ 2,689,528
Loans Held for Sale	2,640	2,150
Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale: Fair Value	64,996	63,859
Debt Securities Issued by Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	1,336	1,464
Debt Securities Issued by Corporations
Assets:
Available-for-Sale: Fair Value	700,472	671,675
Mortgage-Backed Securities
Assets:
Available-for-Sale: Fair Value	575,265	484,764
Fair Value, Measurements, Recurring
Assets:
Available-for-Sale: Fair Value	2,887,019	2,689,528
Loans Held for Sale	2,640	2,150
Mortgage Servicing Rights	628	647
Other Assets	15,287	18,155
Derivatives	125,683	161,473
Total Assets Measured at Fair Value on a Recurring Basis	3,031,257	2,871,953
Liabilities:
Derivatives	$ 132,325	$ 154,058
Derivative Liability Statement Of Financial Position [ExtensibleEnumeration]	Other Liabilities	Other Liabilities
Total Liabilities Measured at Fair Value on a Recurring Basis	$ 132,325	$ 154,058
Fair Value, Measurements, Recurring | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Available-for-Sale: Fair Value	227,396	249,072
Fair Value, Measurements, Recurring | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale: Fair Value	64,996	63,859
Fair Value, Measurements, Recurring | Debt Securities Issued by Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	1,336	1,464
Fair Value, Measurements, Recurring | Debt Securities Issued by Corporations
Assets:
Available-for-Sale: Fair Value	700,472	671,675
Fair Value, Measurements, Recurring | Residential - U.S. Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	575,265	484,764
Fair Value, Measurements, Recurring | Mortgage-Backed Securities
Assets:
Available-for-Sale: Fair Value	1,317,554	1,218,694
Fair Value, Measurements, Recurring | Residential - Collateralized U.S. Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	1,008,504	935,220
Fair Value, Measurements, Recurring | Commercial - Government Agencies or Sponsored Agencies
Assets:
Available-for-Sale: Fair Value	309,050	283,474
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Available-for-Sale: Fair Value	132,509	150,389
Loans Held for Sale	0	0
Mortgage Servicing Rights	0	0
Other Assets	15,287	18,155
Derivatives	0	0
Total Assets Measured at Fair Value on a Recurring Basis	147,796	168,544
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	132,509	150,389
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 - 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) | 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) | Residential - Collateralized 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 or Sponsored Agencies
Assets:
Available-for-Sale: Fair Value	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Available-for-Sale: Fair Value	2,754,510	2,539,139
Loans Held for Sale	2,640	2,150
Mortgage Servicing Rights	0	0
Other Assets	0	0
Derivatives	125,625	161,439
Total Assets Measured at Fair Value on a Recurring Basis	2,882,775	2,702,728
Liabilities:
Derivatives	$ 132,325	$ 154,058
Derivative Liability Statement Of Financial Position [ExtensibleEnumeration]	Other Liabilities	Other Liabilities
Total Liabilities Measured at Fair Value on a Recurring Basis	$ 132,325	$ 154,058
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	94,887	98,683
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by States and Political Subdivisions
Assets:
Available-for-Sale: Fair Value	64,996	63,859
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	1,336	1,464
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Corporations
Assets:
Available-for-Sale: Fair Value	700,472	671,675
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - U.S. Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	575,265	484,764
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Backed Securities
Assets:
Available-for-Sale: Fair Value	1,317,554	1,218,694
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - Collateralized U.S. Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	1,008,504	935,220
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Government Agencies or Sponsored Agencies
Assets:
Available-for-Sale: Fair Value	309,050	283,474
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	628	647
Other Assets	0	0
Derivatives	58	34
Total Assets Measured at Fair Value on a Recurring Basis	686	681
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 | 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 - U.S. Government-Sponsored Enterprises
Assets:
Available-for-Sale: Fair Value	0	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) | Residential - Collateralized 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 or Sponsored Agencies
Assets:
Available-for-Sale: Fair Value	$ 0	$ 0