Securities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Proceeds from sale of available-for-sale debt securities, including legacy securities			$ 86,800,000
Gross losses from sale of securities			3,800,000
Securities (losses) gains, net	$ (44,000)	$ (176,000)	185,000	$ (69,000)
Unrealized losses on mortgage backed securities of government sponsored entities	228,082,000		228,082,000		$ 217,714,000
Fair value of securities in unrealized loss position	1,562,090,000		1,562,090,000		1,669,656,000
Held-to-maturity securities, allowance for credit loss	0		0
Federal Home Loan Bank and Federal Reserve stock recorded in other assets	73,900,000		73,900,000		67,700,000
Accrued interest receivable on AFS debt securities	7,200,000		7,200,000		7,900,000
Accrued interest receivable on HTM debt securities	$ 200,000		$ 200,000		$ 1,100,000
Common stock, shares outstanding (in shares)	85,299,154		85,299,154		84,861,498
Proceeds from sale of Visa Class B shares			$ 4,104,000	0
Visa | Common Class B
Debt Securities, Available-for-sale [Line Items]
Common stock, shares outstanding (in shares)					11,330
Proceeds from sale of Visa Class B shares			4,100,000
Asset Pledged as Collateral
Debt Securities, Available-for-sale [Line Items]
Fair value of debt securities pledged as collateral	$ 1,500,000,000		1,500,000,000
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
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
Gross losses from sale of securities				19,000
Gross gains from sale of securities				24,000
Unrealized losses on mortgage backed securities of government sponsored entities					$ 101,000
Fair value of securities in unrealized loss position					10,579,000
CRA - Qualified Mutual Fund
Debt Securities, Available-for-sale [Line Items]
Securities (losses) gains, net	(44,000)	$ (200,000)	(200,000)	$ (100,000)
Investment in mutual fund carried at fair value	13,500,000		13,500,000		13,600,000
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	526,000		526,000		478,000
Fair value of securities in unrealized loss position	44,042,000		44,042,000		28,527,000
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	215,500,000		215,500,000
Fair value of securities in unrealized loss position	1,300,000,000		1,300,000,000
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	10,633,000		10,633,000		10,911,000
Fair value of securities in unrealized loss position	116,476,000		116,476,000		123,420,000
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	$ 82,000		$ 82,000		1,411,000
Fair value of securities in unrealized loss position	67,035,000		67,035,000		292,632,000
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	30.00%		30.00%
Obligations of state and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Unrealized losses on mortgage backed securities of government sponsored entities	$ 1,362,000		$ 1,362,000		1,096,000
Fair value of securities in unrealized loss position	5,774,000		5,774,000		$ 9,390,000
Allowance for credit losses on AFS debt securities	$ 0		$ 0