Loans and Allowance for Credit Losses - Activity in the Allowance for Loan Losses, by Portfolio Segment, for the Current Year (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 235,019
Provision for credit loss expense	26,797	$ 10,206
Balance, end of period	252,168
Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	235,019	225,231
Provision for credit loss expense	26,797	10,206
Charge-offs	(11,261)	(9,828)
Recoveries	1,613	1,758
Net (charge-offs) recoveries	(9,648)	(8,070)
Balance, end of period	252,168	227,367
Loans, Excluding Acquired Loans | Nonperforming
Allowance for Loan and Lease Losses [Roll Forward]
Provision for credit loss expense	15,600
Loans, Excluding Acquired Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	41,587	36,470
Provision for credit loss expense	1,572	2,872
Charge-offs	(4,243)	(4,593)
Recoveries	997	442
Net (charge-offs) recoveries	(3,246)	(4,151)
Balance, end of period	39,913	35,191
Loans, Excluding Acquired Loans | Real Estate:
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	181,962	177,177
Provision for credit loss expense	22,443	5,359
Charge-offs	(4,425)	(2,857)
Recoveries	99	735
Net (charge-offs) recoveries	(4,326)	(2,122)
Balance, end of period	200,079	180,414
Loans, Excluding Acquired Loans | Consumer: | Credit Card
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	6,007	5,868
Provision for credit loss expense	1,359	1,298
Charge-offs	(1,460)	(1,646)
Recoveries	211	248
Net (charge-offs) recoveries	(1,249)	(1,398)
Balance, end of period	6,117	5,768
Loans, Excluding Acquired Loans | Consumer: | Other Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,463	5,716
Provision for credit loss expense	1,423	677
Charge-offs	(1,133)	(732)
Recoveries	306	333
Net (charge-offs) recoveries	(827)	(399)
Balance, end of period	$ 6,059	$ 5,994