Debt Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($) security
Summary of debt securities
Equity securities, realized gain (loss)	$ 1,700,000
Debt securities, available-for-sale	4,785,719,000	$ 4,245,205,000
Number of credit rating categories, highest | security		4
Interest receivable, available-for-sale debt securities	9,319,000	$ 8,037,000
ACL on available-for-sale debt securities		0
Debt securities, held-to-maturity	3,502,411,000	3,294,847,000
Interest receivable, held-to-maturity debt securities	16,990,000	16,538,000
ACL on held-to-maturity debt securities	0	0
Asset Pledged as Collateral | FHLB, FRB, securities sold under agreements to repurchase, and deposits
Summary of debt securities
Debt securities, available-for-sale	6,479,495,000	4,254,268,000
Financial Asset, Past Due
Summary of debt securities
Debt securities, available-for-sale	0	0
Debt securities, held-to-maturity	$ 0	$ 0