Fair Value of Assets and Liabilities - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Assets:
Total Investment Securities Available-for-Sale	$ 3,111,504	$ 2,689,528
Loans Held for Sale	1,867	2,150
Derivatives	108,223	161,473
Liabilities:
Derivatives	120,147	154,058
Debt Securities Issued by States and Political Subdivisions
Assets:
Total Investment Securities Available-for-Sale	65,960	63,859
Debt Securities Issued by U.S. Government-Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	985	1,464
Debt Securities Issued by Corporations
Assets:
Total Investment Securities Available-for-Sale	728,842	671,675
Total Collateralized Mortgage Obligations
Assets:
Total Investment Securities Available-for-Sale	1,465,837	1,218,694
Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	1,097,369	935,220
Commercial - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	332,461	283,474
Commercial - Non-Agency
Assets:
Total Investment Securities Available-for-Sale	36,007
Fair Value, Measurements, Recurring
Assets:
Total Investment Securities Available-for-Sale	3,111,504	2,689,528
Loans Held for Sale	1,867	2,150
Mortgage Servicing Rights	619	647
Deferred Compensation Plan Assets	14,569	18,155
Derivatives	108,223	161,473
Total Assets Measured at Fair Value on a Recurring Basis	3,236,782	2,871,953
Liabilities:
Derivatives	120,147	154,058
Total Liabilities Measured at Fair Value on a Recurring Basis	120,147	154,058
Fair Value, Measurements, Recurring | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Total Investment Securities Available-for-Sale	243,715	249,072
Fair Value, Measurements, Recurring | Debt Securities Issued by States and Political Subdivisions
Assets:
Total Investment Securities Available-for-Sale	65,960	63,859
Fair Value, Measurements, Recurring | Debt Securities Issued by U.S. Government-Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	985	1,464
Fair Value, Measurements, Recurring | Debt Securities Issued by Corporations
Assets:
Total Investment Securities Available-for-Sale	728,842	671,675
Fair Value, Measurements, Recurring | Total Collateralized Mortgage Obligations
Assets:
Total Investment Securities Available-for-Sale	1,465,837	1,218,694
Fair Value, Measurements, Recurring | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	1,097,369	935,220
Fair Value, Measurements, Recurring | Commercial - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	332,461	283,474
Fair Value, Measurements, Recurring | Commercial - Non-Agency
Assets:
Total Investment Securities Available-for-Sale	36,007
Fair Value, Measurements, Recurring | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	606,165	484,764
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Total Investment Securities Available-for-Sale	133,946	150,389
Loans Held for Sale	0	0
Mortgage Servicing Rights	0	0
Deferred Compensation Plan Assets	14,569	18,155
Derivatives	0	0
Total Assets Measured at Fair Value on a Recurring Basis	148,515	168,544
Liabilities:
Derivatives	0	0
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:
Total Investment Securities Available-for-Sale	133,946	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:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by U.S. Government-Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Debt Securities Issued by Corporations
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Total Collateralized Mortgage Obligations
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Commercial - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Commercial - Non-Agency
Assets:
Total Investment Securities Available-for-Sale	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Total Investment Securities Available-for-Sale	2,977,558	2,539,139
Loans Held for Sale	1,867	2,150
Mortgage Servicing Rights	0	0
Deferred Compensation Plan Assets	0	0
Derivatives	108,186	161,439
Total Assets Measured at Fair Value on a Recurring Basis	3,087,611	2,702,728
Liabilities:
Derivatives	120,147	154,058
Total Liabilities Measured at Fair Value on a Recurring Basis	120,147	154,058
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Total Investment Securities Available-for-Sale	109,769	98,683
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by States and Political Subdivisions
Assets:
Total Investment Securities Available-for-Sale	65,960	63,859
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by U.S. Government-Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	985	1,464
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Corporations
Assets:
Total Investment Securities Available-for-Sale	728,842	671,675
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Total Collateralized Mortgage Obligations
Assets:
Total Investment Securities Available-for-Sale	1,465,837	1,218,694
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	1,097,369	935,220
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	332,461	283,474
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Non-Agency
Assets:
Total Investment Securities Available-for-Sale	36,007
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	606,165	484,764
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Total Investment Securities Available-for-Sale	0	0
Loans Held for Sale	0	0
Mortgage Servicing Rights	619	647
Deferred Compensation Plan Assets	0	0
Derivatives	37	34
Total Assets Measured at Fair Value on a Recurring Basis	656	681
Liabilities:
Derivatives	0	0
Total Liabilities Measured at Fair Value on a Recurring Basis	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Debt Securities Issued by States and Political Subdivisions
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Debt Securities Issued by U.S. Government-Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Debt Securities Issued by Corporations
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Total Collateralized Mortgage Obligations
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commercial - Non-Agency
Assets:
Total Investment Securities Available-for-Sale	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	$ 0	$ 0