Other Borrowings (Details) - USD ($)	1 Months Ended	2 Months Ended		12 Months Ended
	Feb. 29, 2016	Feb. 28, 2022	Feb. 28, 2019	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Securities sold under agreement to repurchase				$ 250,197,000	$ 270,773,000
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss				10,884,118,000	9,737,138,000
Other borrowings				297,829,000	324,119,000
Loans Payable				11,429,000	17,143,000
Unsecured Term Loan Agreement ("Term Loan")
Debt Instrument [Line Items]
Term (in years)			5 years
Unsecured term loan, face amount			$ 40,000,000
Unsecured Term Loan Agreement ("Term Loan") | LIBOR
Debt Instrument [Line Items]
Basis spread			1.25%
Unsecured Term Loan Agreement ("Term Loan") | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread		1.36%
Other Borrowings
Debt Instrument [Line Items]
Average balance during the year				168,745,000	211,039,000
Maximum balance outstanding at any month-end				$ 250,197,000	$ 284,269,000
Average interest rate during the year				2.16%	0.24%
Average interest rate at December 31				3.56%	1.44%
Other Borrowings | New Market Tax Credit Investments
Debt Instrument [Line Items]
Other borrowings				$ 36,200,000
Interest rate				1.00%
Term of interest (in years)				7 years
Other Borrowings | New Market Tax Credit Investments | Minimum
Debt Instrument [Line Items]
Term (in years)				25 years
Other Borrowings | New Market Tax Credit Investments | Maximum
Debt Instrument [Line Items]
Term (in years)				30 years
Line of Credit
Debt Instrument [Line Items]
Remaining borrowing capacity				$ 2,500,000,000
Amount withdrawn				0
Line Of Credit Facility, Bank Term Funding Program				215,000,000
Line of Credit | Asset Pledged as Collateral without Right | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss				2,900,000,000
Line of Credit | Senior Unsecured Revolving Credit Agreement ("Revolving Agreement") | Revolving Credit Facility
Debt Instrument [Line Items]
Term (in years)	1 year
Line of Credit, Current	$ 25,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.30%
Line of Credit | Senior Unsecured Revolving Credit Agreement ("Revolving Agreement") | Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread	1.36%
Unsecured Term Loan
Debt Instrument [Line Items]
Average balance during the year				14,959,000	$ 20,681,000
Maximum balance outstanding at any month-end				$ 17,143,000	$ 22,857,000
Average interest rate during the year				6.44%	2.94%
Average interest rate at December 31				6.70%	5.48%