Securities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale debt securities, including legacy securities	$ 0	$ 0	$ 277,200,000	$ 0
Gross losses from sale of securities			39,500,000
Unrealized losses on mortgage backed securities of government sponsored entities	136,114,000		136,114,000		$ 150,385,000
Fair value of securities in unrealized loss position	3,126,659,000		3,126,659,000		2,040,898,000
Held-to-maturity securities, allowance for credit loss	0		0
Federal home loan bank and federal reserve stock recorded in other assets	138,600,000		138,600,000		135,600,000
Accrued interest receivable on AFS debt securities	26,800,000		26,800,000		24,500,000
Accrued interest receivable on HTM debt securities	900,000		900,000		1,000,000.0
Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Fair value of debt securities pledged as collateral	1,800,000,000		1,800,000,000
CRA - Qualified Mutual Fund
Debt Securities, Available-for-sale [Line Items]
Gross losses from sale of securities	100,000		100,000
Gross gains from sale of securities		$ 39,200		$ 200,000
Investment in mutual fund carried at fair value	13,800,000		13,800,000		13,900,000
U.S. Treasury securities and obligations of U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	941,000		941,000		451,000
Fair value of securities in unrealized loss position	47,242,000		47,242,000		35,778,000
Allowance for credit losses on AFS debt securities	0		0
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	126,200,000		126,200,000
Fair value of securities in unrealized loss position	2,400,000,000		2,400,000,000
Allowance for credit losses on AFS debt securities	0		0
Private mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	5,074,000		5,074,000		5,010,000
Fair value of securities in unrealized loss position	69,473,000		69,473,000		77,798,000
Allowance for credit losses on AFS debt securities	$ 0		$ 0
Average credit support percentage	22.00%		22.00%
CLOs
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	$ 858,000		$ 858,000		512,000
Fair value of securities in unrealized loss position	340,335,000		340,335,000		249,934,000
Allowance for credit losses on AFS debt securities	$ 0		$ 0
CLOs | Standard & Poor's, AAA Rating
Debt Securities, Available-for-sale [Line Items]
Number of positions held, percentage of total	38.00%		38.00%
CLOs | Standard & Poor's, AA Rating
Debt Securities, Available-for-sale [Line Items]
Number of positions held, percentage of total	24.00%		24.00%
Obligations of state and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	$ 1,143,000		$ 1,143,000		2,520,000
Fair value of securities in unrealized loss position	88,145,000		88,145,000		249,898,000
Allowance for credit losses on AFS debt securities	0		0
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	1,944,000		1,944,000		576,000
Fair value of securities in unrealized loss position	$ 139,014,000		$ 139,014,000		$ 132,345,000