Derivative Instruments - Hedge Derivatives (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
		Apr. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	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			$ (2,268,000)	$ (2,511,000)	$ (4,744,000)	$ (5,020,000)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months					9,900,000
Cash flow hedge | Hedging derivative | Asset derivatives
Derivative [Line Items]
Notional Amount			1,750,000,000		1,750,000,000				$ 1,750,000,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)			(23,339,000)	0	(11,361,000)	0
Cash Flow Hedges Derivative Instruments at Fair Value, Net			74,408,000		74,408,000				94,175,000
Fair value hedge | Hedging derivative
Derivative [Line Items]
Forecasted Notional Amount			2,270,724,000		2,270,724,000				1,420,724,000
Fair Value Hedge Assets	[1]		43,504,000		43,504,000				56,056,000
Fair value hedge | Hedging derivative | Securities
Derivative [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings		$ 986,000,000	33,510,000	15,344,000	1,825,000	64,183,000
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge			(33,510,000)	(15,344,000)	(1,825,000)	(64,183,000)
Derivative Instruments and Hedges, Assets			1,436,783,000		1,436,783,000				1,445,511,000
Fair Value Hedging Adjustment			(57,401,000)		(57,401,000)				(56,056,000)
Gain (Loss) on Fair Value Hedges Recognized in Earnings		10,800,000
Fair value hedge | Hedging derivative | Securities | Asset derivatives
Derivative [Line Items]
Forecasted Notional Amount			$ 1,420,724,000		$ 1,420,724,000				1,420,724,000
Derivative Asset, Statement of Financial Position			Other assets		Other assets
Weighted Average Remaining Maturity					6 years 11 months 4 days
Pay Rate (as percent)			2.25%		2.25%
Derivative, Type of Interest Rate Paid on Swap					3 month LIBOR/ Federal Funds/ SOFR
Fair Value Hedge Assets	[1]		$ 57,401,000		$ 57,401,000				$ 56,056,000
Terminated Notional Amount of Interest Rate Derivatives		164,300,000
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
Fair value hedge | Hedging derivative | Securities | Secured Overnight Financing Rate
Derivative [Line Items]
Forecasted Notional Amount			563,800,000		563,800,000
Fair value hedge | Hedging derivative | Securities | LIBOR
Derivative [Line Items]
Forecasted Notional Amount			464,700,000		464,700,000
Fair value hedge | Hedging derivative | Loans
Derivative [Line Items]
Amortization expense, reduction to interest income on loans			168,000	544,000	378,000	1,200,000
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances
Derivative [Line Items]
Gain (Loss) on Fair Value Hedges Recognized in Earnings			(15,780,000)	0	(13,897,000)	0
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge			15,780,000	$ 0	13,897,000	$ 0
Derivative Instruments and Hedges, Assets			836,103,000		836,103,000				$ 0
Fair Value Hedging Adjustment			(13,897,000)		(13,897,000)				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		$ 425,000,000	$ 425,000,000	0
Weighted Average Remaining Maturity					4 years 6 months 29 days
Pay Rate (as percent)			0.00%		0.00%
Derivative, Type of Interest Rate Paid on Swap					N/A
Fair Value Hedge Assets	[1]		$ (13,897,000)		$ (13,897,000)				0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]			Other liabilities		Other liabilities
Interest Rate Floor | Hedging derivative | Asset derivatives
Derivative [Line Items]
Derivative Asset, Statement of Financial Position			Other assets		Other assets
Weighted Average Remaining Maturity					4 years 4 months 2 days
Notional Amount			$ 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			$ 37,880,000		$ 37,880,000				48,622,000
Interest Rate Contract | Hedging derivative | Asset derivatives
Derivative [Line Items]
Derivative Asset, Statement of Financial Position			Other assets		Other assets
Weighted Average Remaining Maturity					4 years 4 months 2 days
Notional Amount			$ 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			$ 36,528,000		$ 36,528,000				$ 45,553,000

[1] The variation margin payments for derivatives cleared through central clearing houses are characterized as settlements. At June 30, 2023 and December 31, 2022, the notional amount of fair value derivatives cleared through central clearing houses was $1.3 billion and $877.7 million with a fair value that approximates zero due to $48.4 million and $47.9 million in received variation margin.