Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]
Servicing Asset		$ 11,800
Recurring
Assets, Fair Value Disclosure [Abstract]
U.S. Treasury securities		872,791	$ 893,412
U.S. Government agency securities		288,833	262,730
Mortgage-backed securities		970,212	947,390
State and municipal securities		1,592,783	1,585,895
Agency-backed securities		221,668	191,635
Corporate notes and other		432,431	436,468
Total investment securities available-for-sale		4,378,718	4,317,530
Other Investments		184,372	179,487
Servicing Asset at Fair Value, Amount		11,812
Other assets		209,530	197,541
Total assets at fair value		4,784,432	4,694,558
Liabilities at fair value: [Abstract]
Other liabilities		118,698	79,068
Total liabilities at fair value		118,698	79,068
Recurring | Quoted market prices in an active market (Level 1)
Assets, Fair Value Disclosure [Abstract]
U.S. Treasury securities		0	0
U.S. Government agency securities		0	0
Mortgage-backed securities		0	0
State and municipal securities		0	0
Agency-backed securities		0	0
Corporate notes and other		0	0
Total investment securities available-for-sale		0	0
Other Investments		0	0
Servicing Asset at Fair Value, Amount		0
Other assets		0	0
Total assets at fair value		0	0
Liabilities at fair value: [Abstract]
Other liabilities		0	0
Total liabilities at fair value		0	0
Recurring | Models with significant observable market parameters (Level 2)
Assets, Fair Value Disclosure [Abstract]
U.S. Treasury securities		872,791	893,412
U.S. Government agency securities		288,833	262,730
Mortgage-backed securities		970,212	947,390
State and municipal securities		1,592,451	1,585,416
Agency-backed securities		221,668	191,635
Corporate notes and other		419,579	436,468
Total investment securities available-for-sale		4,365,534	4,317,051
Other Investments		22,137	22,347
Servicing Asset at Fair Value, Amount		0
Other assets		209,530	197,541
Total assets at fair value		4,597,201	4,536,939
Liabilities at fair value: [Abstract]
Other liabilities		118,698	79,068
Total liabilities at fair value		118,698	79,068
Recurring | Models with significant unobservable market parameters (Level 3)
Assets, Fair Value Disclosure [Abstract]
U.S. Treasury securities		0	0
U.S. Government agency securities		0	0
Mortgage-backed securities		0	0
State and municipal securities		332	479
Agency-backed securities		0	0
Corporate notes and other		12,852	0
Total investment securities available-for-sale		13,184	479
Other Investments		162,235	157,140
Servicing Asset at Fair Value, Amount		11,812
Other assets		0	0
Total assets at fair value		187,231	157,619
Liabilities at fair value: [Abstract]
Other liabilities		0	0
Total liabilities at fair value		0	0
Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		91,451	56,104
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]
Other real estate owned		2,766	3,937
Collateral dependent loans (1)	[1]	88,685	52,167
Nonrecurring | Quoted market prices in an active market (Level 1)
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		0	0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]
Other real estate owned		0	0
Collateral dependent loans (1)	[1]	0	0
Nonrecurring | Models with significant observable market parameters (Level 2)
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		0	0
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]
Other real estate owned		0	0
Collateral dependent loans (1)	[1]	0	0
Nonrecurring | Models with significant unobservable market parameters (Level 3)
Assets, Fair Value Disclosure [Abstract]
Total assets at fair value		91,451	56,104
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Abstract]
Other real estate owned		2,766	3,937
Collateral dependent loans (1)	[1]	$ 88,685	$ 52,167

[1] The carrying values of collateral dependent loans at March 31, 2024 and December 31, 2023 are net of valuation allowances of $33.4 million and $18.6 million, respectively.