Fair Value Disclosures - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	$ 6,741,573	$ 6,372,463
Equity	48,174	48,200
Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held for sale	29,457	54,119
Equity	48,174	48,200
Derivatives	7,732	7,969
Total assets	6,826,934	6,482,752
Derivatives	6,168	7,021
Total liabilities	6,168	7,021
U.S. agency debentures
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	127,668	132,456
U.S. agency debentures | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	6,720,940	6,349,320
Obligations of states and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	15,892	16,644
Obligations of states and political subdivisions | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	15,892	16,644
Other securities | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	4,740	6,499
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	0
Derivatives	0	0
Total assets	1,097,918	929,305
Derivatives	0	0
Total liabilities	0	0
Level 1 | U.S. agency debentures | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	1,097,308	928,287
Level 1 | Obligations of states and political subdivisions | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	0	0
Level 1 | Other securities | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	610	1,018
Level 2 | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held for sale	29,457	54,119
Equity	36,661	36,690
Derivatives	7,732	7,969
Total assets	5,717,503	5,541,937
Derivatives	6,168	7,021
Total liabilities	6,168	7,021
Level 2 | U.S. agency debentures | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	5,623,633	5,421,033
Level 2 | Obligations of states and political subdivisions | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	15,892	16,644
Level 2 | Other securities | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	4,129	5,481
Level 3 | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held for sale	0	0
Equity	11,513	11,510
Derivatives	0	0
Total assets	11,513	11,510
Derivatives	0	0
Total liabilities	0	0
Level 3 | U.S. agency debentures | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	0	0
Level 3 | Obligations of states and political subdivisions | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	0	0
Level 3 | Other securities | Fair Value, Recurring
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale	$ 0	$ 0