Financial Derivatives - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative [Line Items]
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable (includes $10,666 and $12,514, respectively, related to consolidated trusts)		Accrued interest receivable (includes $10,666 and $12,514, respectively, related to consolidated trusts)		Accrued interest receivable (includes $10,666 and $12,514, respectively, related to consolidated trusts)
Gain expected to be reclassified from AOCI to earnings over next 12 months	$ 16,600,000		$ 16,600,000
Gain (loss) from interest rate swaps designated as cash flow hedges reclassified to earnings	0	$ 0	0	$ 0
Financial derivatives in net payable position	0		0		$ 0
Notional amount	24,460,267,000		24,460,267,000		23,878,611,000
Exchange Cleared
Derivative [Line Items]
Notional amount	19,500,000,000		19,500,000,000		19,500,000,000
Interest Rate Swap
Derivative [Line Items]
Notional amount	24,500,000,000		24,500,000,000		23,900,000,000
Cleared Swaps
Derivative [Line Items]
Accrued interest on cleared swaps	14,300,000		14,300,000		6,100,000
Uncleared Swaps
Derivative [Line Items]
Accrued interest payable	$ 6,300,000		$ 6,300,000		$ 3,600,000