Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 297,888,000	$ 278,695,000	$ 293,404,000	$ 269,366,000	$ 269,366,000
Loans charged off	(14,007,000)	(4,787,000)	(24,959,000)	(21,690,000)
Recoveries of loans previously charged off	2,705,000	2,816,000	5,059,000	5,715,000
Net loans (charged off) recovered	(11,302,000)	(1,971,000)	(19,900,000)	(15,975,000)
Provision for credit losses	10,005,000	10,718,000	23,087,000	34,051,000
Ending balance	375,941,000	287,442,000	375,941,000	287,442,000	$ 293,404,000
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	(1,393,000)	(971,000)	(3,550,000)	240,000
Off-Balance-Sheet, Credit Loss, Liability	14,540,000	16,568,000	14,540,000	16,568,000
Loans - Excluding OBS Credit Exposure
Allowance for Loan and Lease Losses [Roll Forward]
PCD Loans credit discount	55,906,000		55,906,000
Loans charged off	(14,007,000)	(4,787,000)	(24,959,000)	(21,690,000)
Recoveries of loans previously charged off	2,705,000	2,816,000	5,059,000	5,715,000
Net loans (charged off) recovered	(11,302,000)	(1,971,000)	(19,900,000)	(15,975,000)
Provision for credit losses	10,005,000	10,718,000	23,087,000	34,051,000
Real estate - commercial mortgage | Loans - Excluding OBS Credit Exposure
Allowance for Loan and Lease Losses [Roll Forward]
PCD Loans credit discount	32,157,000		32,157,000
Loans charged off	(7,853,000)	(230,000)	(7,879,000)	(13,592,000)
Recoveries of loans previously charged off	146,000	29,000	298,000	815,000
Net loans (charged off) recovered	(7,707,000)	(201,000)	(7,581,000)	(12,777,000)
Provision for credit losses	$ 11,115,000	$ 6,247,000	$ 12,916,000	$ 15,623,000