Derivative Instruments - Hedge Derivatives (Details) - USD ($)		1 Months Ended		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Apr. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 06, 2023	May 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Net gain on cash flow hedges reclassified from other comprehensive income into net income, net of tax				$ (2,473,000)	$ (2,477,000)	$ (7,217,000)	$ (7,497,000)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months						9,800,000
Cash flow hedge | Hedging derivative | Asset derivatives
Derivative [Line Items]
Notional Amount		$ 1,750,000,000		1,750,000,000		1,750,000,000					$ 1,750,000,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)				(17,403,000)	0	(28,764,000)	0
Cash Flow Hedges Derivative Instruments at Fair Value, Net		48,970,000		48,970,000		48,970,000					94,175,000
Fair value hedge | Hedging derivative
Derivative [Line Items]
Forecasted Notional Amount		2,862,139,000		2,862,139,000		2,862,139,000					1,420,724,000
Fair Value Hedge Assets	[1]	61,212,000		61,212,000		61,212,000					56,056,000
Fair value hedge | Hedging derivative | Securities
Derivative [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings		1,500,000	$ 986,000	15,669,000	67,917,000	17,494,000	132,100,000
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge				(15,669,000)	(67,917,000)	(17,494,000)	(132,100,000)
Derivative Instruments and Hedges, Assets		1,957,510,000		1,957,510,000		1,957,510,000					1,445,511,000
Fair Value Hedging Adjustment		(73,550,000)		(73,550,000)		(73,550,000)					(56,056,000)
Gain (Loss) on Fair Value Hedges Recognized in Earnings			10,400,000
Fair value hedge | Hedging derivative | Securities | Asset derivatives
Derivative [Line Items]
Forecasted Notional Amount		$ 2,012,139,000		$ 2,012,139,000		$ 2,012,139,000					1,420,724,000
Derivative Asset, Statement of Financial Position		Other assets		Other assets		Other assets
Weighted Average Remaining Maturity						10 years 9 months 10 days
Pay Rate (as percent)		2.75%		2.75%		2.75%
Derivative, Type of Interest Rate Paid on Swap						Federal Funds/ SOFR
Fair Value Hedge Assets	[1]	$ 73,550,000		$ 73,550,000		$ 73,550,000					$ 56,056,000
Terminated Notional Amount of Interest Rate Derivatives			164,300,000					$ 33,600,000
Terminated Fair Value Amount of Interest Rate Derivatives			$ 14,300,000
Fair value hedge | Hedging derivative | Securities | Liability derivatives
Derivative [Line Items]
Derivative Liability, Statement of Financial Position [Extensible Enumeration]											Other liabilities
Fair value hedge | Hedging derivative | Securities | Federal Funds Rate
Derivative [Line Items]
Forecasted Notional Amount		392,200,000		392,200,000		392,200,000
Fair value hedge | Hedging derivative | Securities | Secured Overnight Financing Rate
Derivative [Line Items]
Forecasted Notional Amount		1,600,000,000		1,600,000,000		1,600,000,000
Fair value hedge | Hedging derivative | Loans
Derivative [Line Items]
Amortization expense, reduction to interest income on loans				141,000	408,000	519,000	1,600,000
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances
Derivative [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings				1,559,000	0	(12,338,000)	0
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge				(1,559,000)	$ 0	12,338,000	$ 0
Derivative Instruments and Hedges, Assets		837,662,000		837,662,000		837,662,000					$ 0
Fair Value Hedging Adjustment		(12,338,000)		(12,338,000)		(12,338,000)					0
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances | Liability derivatives
Derivative [Line Items]
Forecasted Notional Amount		$ 850,000,000		$ 850,000,000		$ 850,000,000			$ 425,000,000	$ 425,000,000	0
Weighted Average Remaining Maturity						4 years 3 months 25 days
Pay Rate (as percent)		0.00%		0.00%		0.00%
Derivative, Type of Interest Rate Paid on Swap						N/A
Fair Value Hedge Assets	[1]	$ (12,338,000)		$ (12,338,000)		$ (12,338,000)					0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other liabilities		Other liabilities		Other liabilities
Interest Rate Floor | Hedging derivative | Asset derivatives
Derivative [Line Items]
Derivative Asset, Statement of Financial Position		Other assets		Other assets		Other assets
Weighted Average Remaining Maturity						4 years 1 month 2 days
Notional Amount		$ 875,000,000		$ 875,000,000		$ 875,000,000					875,000,000
Derivative, Type of Interest Received						4.00%-4.50% minus USD-Term SOFR 1M
Derivative, Type Of Interest Rate Paid On Swap1						N/A
Cash Flow Hedges Derivative Instruments at Fair Value, Net		$ 25,225,000		$ 25,225,000		$ 25,225,000					48,622,000
Interest Rate Contract | Hedging derivative | Asset derivatives
Derivative [Line Items]
Derivative Asset, Statement of Financial Position		Other assets		Other assets		Other assets
Weighted Average Remaining Maturity						4 years 1 month 2 days
Notional Amount		$ 875,000,000		$ 875,000,000		$ 875,000,000					875,000,000
Derivative, Type of Interest Received						4.25%-4.75% minus USD-Term SOFR 1M
Derivative, Type Of Interest Rate Paid On Swap1						USD-Term SOFR 1M minus 6.75%-7.00%
Cash Flow Hedges Derivative Instruments at Fair Value, Net		$ 23,745,000		$ 23,745,000		$ 23,745,000					$ 45,553,000

[1] The variation margin payments for derivatives cleared through central clearing houses are characterized as settlements. At September 30, 2023 and December 31, 2022, the notional amount of fair value derivatives cleared through central clearing houses was $1.9 billion and $877.7 million with a fair value that approximates zero due to $80.6 million and $47.9 million in received variation margin.