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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, 2025	Dec. 31, 2024
Assets:
Total Investment Securities Available-for-Sale	$ 3,280,410	$ 2,689,528
Loans Held for Sale	1,236	2,150
Derivatives	104,111	161,473
Liabilities:
Derivatives	111,357	154,058
Debt Securities Issued by States and Political Subdivisions
Assets:
Total Investment Securities Available-for-Sale	66,041	63,859
Debt Securities Issued by U.S. Government-Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	991	1,464
Debt Securities Issued by Corporations
Assets:
Total Investment Securities Available-for-Sale	732,927	671,675
Total Collateralized Mortgage Obligations
Assets:
Total Investment Securities Available-for-Sale	1,601,375	1,218,694
Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	1,210,591	935,220
Commercial - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	330,185	283,474
Commercial - Non-Agency
Assets:
Total Investment Securities Available-for-Sale	60,599
Fair Value, Measurements, Recurring
Assets:
Total Investment Securities Available-for-Sale	3,280,410	2,689,528
Loans Held for Sale	1,236	2,150
Mortgage Servicing Rights	611	647
Deferred Compensation Plan Assets	15,277	18,155
Derivatives	104,111	161,473
Total Assets Measured at Fair Value on a Recurring Basis	3,401,645	2,871,953
Liabilities:
Derivatives	111,357	154,058
Total Liabilities Measured at Fair Value on a Recurring Basis	111,357	154,058
Fair Value, Measurements, Recurring | Debt Securities Issued by the U.S. Treasury and Government Agencies
Assets:
Total Investment Securities Available-for-Sale	241,841	249,072
Fair Value, Measurements, Recurring | Debt Securities Issued by States and Political Subdivisions
Assets:
Total Investment Securities Available-for-Sale	66,041	63,859
Fair Value, Measurements, Recurring | Debt Securities Issued by U.S. Government-Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	991	1,464
Fair Value, Measurements, Recurring | Debt Securities Issued by Corporations
Assets:
Total Investment Securities Available-for-Sale	732,927	671,675
Fair Value, Measurements, Recurring | Total Collateralized Mortgage Obligations
Assets:
Total Investment Securities Available-for-Sale	1,601,375	1,218,694
Fair Value, Measurements, Recurring | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	1,210,591	935,220
Fair Value, Measurements, Recurring | Commercial - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	330,185	283,474
Fair Value, Measurements, Recurring | Commercial - Non-Agency
Assets:
Total Investment Securities Available-for-Sale	60,599
Fair Value, Measurements, Recurring | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	637,235	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	138,100	150,389
Loans Held for Sale	0	0
Mortgage Servicing Rights	0	0
Deferred Compensation Plan Assets	15,277	18,155
Derivatives	0	0
Total Assets Measured at Fair Value on a Recurring Basis	153,377	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	138,100	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	3,142,310	2,539,139
Loans Held for Sale	1,236	2,150
Mortgage Servicing Rights	0	0
Deferred Compensation Plan Assets	0	0
Derivatives	104,062	161,439
Total Assets Measured at Fair Value on a Recurring Basis	3,247,608	2,702,728
Liabilities:
Derivatives	111,357	154,058
Total Liabilities Measured at Fair Value on a Recurring Basis	111,357	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	103,741	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	66,041	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	991	1,464
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Debt Securities Issued by Corporations
Assets:
Total Investment Securities Available-for-Sale	732,927	671,675
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Total Collateralized Mortgage Obligations
Assets:
Total Investment Securities Available-for-Sale	1,601,375	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	1,210,591	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	330,185	283,474
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial - Non-Agency
Assets:
Total Investment Securities Available-for-Sale	60,599
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Residential - Government Agencies or Sponsored Enterprises
Assets:
Total Investment Securities Available-for-Sale	637,235	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	611	647
Deferred Compensation Plan Assets	0	0
Derivatives	49	34
Total Assets Measured at Fair Value on a Recurring Basis	660	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

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