Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 375,941,000	$ 287,442,000	$ 293,404,000	$ 269,366,000	$ 269,366,000
Off-Balance-Sheet, Credit Loss, Liability	14,188,000	16,110,000	14,188,000	16,110,000
Loans charged off	(13,144,000)	(7,279,000)	(38,103,000)	(28,969,000)
Recoveries of loans previously charged off	2,022,000	2,181,000	7,081,000	7,896,000
Net loans (charged off) recovered	(11,122,000)	(5,098,000)	(31,022,000)	(21,073,000)
Provision for credit losses	12,281,000	10,395,000	35,368,000	44,446,000
Ending balance	375,961,000	292,739,000	375,961,000	292,739,000	$ 293,404,000
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(352,000)	(458,000)	(3,902,000)	(218,000)
Loans - Excluding OBS Credit Exposure
Allowance for Loan and Lease Losses [Roll Forward]
Initial PCD allowance for credit losses	(1,139,000)
PCD Loans credit discount			54,767,000
Loans charged off	(13,144,000)	(7,279,000)	(38,103,000)	(28,969,000)
Recoveries of loans previously charged off	2,022,000	2,181,000	7,081,000	7,896,000
Net loans (charged off) recovered	(11,122,000)	(5,098,000)	(31,022,000)	(21,073,000)
Provision for credit losses	12,281,000	10,395,000	35,368,000	44,446,000
Real estate - commercial mortgage | Loans - Excluding OBS Credit Exposure
Allowance for Loan and Lease Losses [Roll Forward]
Initial PCD allowance for credit losses	0
PCD Loans credit discount			32,157,000
Loans charged off	(2,723,000)	(860,000)	(10,602,000)	(14,452,000)
Recoveries of loans previously charged off	107,000	101,000	405,000	916,000
Net loans (charged off) recovered	(2,616,000)	(759,000)	(10,197,000)	(13,536,000)
Provision for credit losses	$ (10,255,000)	$ 2,403,000	$ 2,661,000	$ 18,026,000