Securities - Narrative (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Gross gains from sale of securities		$ 24,000
Gross losses from sale of securities		19,000
Unrealized losses on mortgage backed securities of government sponsored entities	$ 287,344,000				$ 287,344,000		$ 248,662,000
Fair value of securities in unrealized loss position	1,813,395,000				1,813,395,000		1,812,522,000
Held-to-maturity securities, allowance for credit loss	0				0
Federal Home Loan Bank and Federal Reserve stock recorded in other assets	70,500,000				70,500,000
Accrued interest receivable on AFS debt securities	8,100,000				8,100,000		7,000,000
Accrued interest receivable on HTM debt securities	$ 1,100,000				$ 1,100,000		$ 1,300,000
Common stock, shares outstanding (in shares)	85,149,880				85,149,880		71,617,852
Visa | Common Class B
Debt Securities, Available-for-sale [Line Items]
Common stock, shares outstanding (in shares)	11,330				11,330
Visa | Common Class A
Debt Securities, Available-for-sale [Line Items]
Conversion rate of Class A stock for each share of Class B stock (in dollars per share)	$ 1.5875				$ 1.5875
Shares issued (in shares)					17,986
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
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale debt securities, including legacy securities		8,400,000
Unrealized losses on mortgage backed securities of government sponsored entities	126,000				126,000		$ 427,000
Fair value of securities in unrealized loss position	10,765,000				10,765,000		11,459,000
CRA - Qualified Mutual Fund
Debt Securities, Available-for-sale [Line Items]
Gross losses from sale of securities	400,000		$ 400,000		500,000	$ 1,100,000
Investment in mutual fund carried at fair value	13,100,000				13,100,000		8,200,000
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	266,725,000				266,725,000		223,083,000
Fair value of securities in unrealized loss position	1,317,198,000				1,317,198,000		1,314,171,000
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	13,927,000				13,927,000		12,831,000
Fair value of securities in unrealized loss position	124,162,000				124,162,000		155,722,000
Allowance for credit losses on AFS debt securities	$ 0				$ 0
Average credit support percentage	22.00%				22.00%
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	$ 3,496,000				$ 3,496,000		10,251,000
Fair value of securities in unrealized loss position	304,168,000				304,168,000		302,904,000
Allowance for credit losses on AFS debt securities	$ 0				$ 0
Collateralized loan obligations | Standard & Poor's, AAA Rating
Debt Securities, Available-for-sale [Line Items]
Number of positions held, percentage of total	38.00%				38.00%
Collateralized loan obligations | Standard & Poor's, AA Rating
Debt Securities, Available-for-sale [Line Items]
Number of positions held, percentage of total	25.00%				25.00%
Obligations of state and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	$ 2,116,000				$ 2,116,000		1,731,000
Fair value of securities in unrealized loss position	19,652,000				19,652,000		$ 24,229,000
Allowance for credit losses on AFS debt securities	$ 0				$ 0
Professional Holding Corp.
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale debt securities, including legacy securities		$ 22,100,000
Business Bank of Florida
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale debt securities, including legacy securities				$ 26,000,000