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, 2023	Mar. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 196,955
Provision for credit loss expense	10,916	$ (19,914)
Balance, end of period	206,557
Loans, Excluding Acquired Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	196,955	205,332
Provision for credit loss expense	10,916	(19,914)
Charge-offs	(3,149)	(8,138)
Recoveries	1,835	1,644
Net (charge-offs) recoveries	(1,314)	(6,494)
Balance, end of period	206,557	178,924
Loans, Excluding Acquired Loans | Other Consumer and Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	6,614	4,617
Provision for credit loss expense	(449)	874
Charge-offs	(456)	(414)
Recoveries	240	387
Net (charge-offs) recoveries	(216)	(27)
Balance, end of period	5,949	5,464
Loans, Excluding Acquired Loans | Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	34,406	17,458
Provision for credit loss expense	(4,804)	(2,519)
Charge-offs	(413)	(6,319)
Recoveries	1,067	557
Net (charge-offs) recoveries	654	(5,762)
Balance, end of period	30,256	9,177
Loans, Excluding Acquired Loans | Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	150,795	179,270
Provision for credit loss expense	14,021	(17,822)
Charge-offs	(1,204)	(485)
Recoveries	294	426
Net (charge-offs) recoveries	(910)	(59)
Balance, end of period	163,906	161,389
Loans, Excluding Acquired Loans | Consumer | Credit cards
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	5,140	3,987
Provision for credit loss expense	2,148	(447)
Charge-offs	(1,076)	(920)
Recoveries	234	274
Net (charge-offs) recoveries	(842)	(646)
Balance, end of period	$ 6,446	$ 2,894