Fair Value Disclosures - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	$ 6,372,463	$ 5,603,723
Equity	48,200	48,770
Trading	0	666
Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held for sale	54,119	34,264
Equity	48,200	48,770
Trading		666
Derivatives	7,969	10,312
Total assets	6,482,752	5,697,735
Derivatives	7,021	8,842
Liabilities, Fair Value Disclosure	7,021	8,842
U.S. government obligations and government-sponsored enterprises
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	132,456	369,288
U.S. government obligations and government-sponsored enterprises | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	6,349,320	5,553,593
Obligations of states and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	16,644	21,141
Obligations of states and political subdivisions | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	16,644	21,141
Other | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	6,499	28,989
Quoted prices in active markets for identical assets (Level 1) | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held for sale	0	0
Equity	0	724
Trading		$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other assets
Derivatives	0	$ 0
Total assets	929,305	1,270,891
Derivatives	0	$ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other liabilities
Liabilities, Fair Value Disclosure	0	$ 0
Quoted prices in active markets for identical assets (Level 1) | U.S. government obligations and government-sponsored enterprises | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	928,287	1,269,553
Quoted prices in active markets for identical assets (Level 1) | Obligations of states and political subdivisions | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	0	0
Quoted prices in active markets for identical assets (Level 1) | Other | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	1,018	614
Significant other observable inputs (Level 2) | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held for sale	54,119	34,264
Equity	36,690	36,765
Trading		$ 666
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other assets
Derivatives	7,969	$ 10,312
Total assets	5,541,937	4,415,563
Derivatives	7,021	$ 8,842
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other liabilities
Liabilities, Fair Value Disclosure	7,021	$ 8,842
Significant other observable inputs (Level 2) | U.S. government obligations and government-sponsored enterprises | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	5,421,033	4,284,040
Significant other observable inputs (Level 2) | Obligations of states and political subdivisions | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	16,644	21,141
Significant other observable inputs (Level 2) | Other | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	5,481	28,375
Significant unobservable inputs (Level 3) | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held for sale	0	0
Equity	11,510	11,281
Trading		$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other assets
Derivatives	0	$ 0
Total assets	11,510	11,281
Derivatives	0	$ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other liabilities
Liabilities, Fair Value Disclosure	0	$ 0
Significant unobservable inputs (Level 3) | U.S. government obligations and government-sponsored enterprises | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	0	0
Significant unobservable inputs (Level 3) | Obligations of states and political subdivisions | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	0	0
Significant unobservable inputs (Level 3) | Other | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair values	$ 0	$ 0