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Derivative Instruments - Hedge Derivatives (Details) - USD ($)
 1 Months Ended 3 Months Ended
Apr. 30, 2022
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Derivative [Line Items]        
Net gain on cash flow hedges reclassified from other comprehensive income into net income, net of tax   $ (2,472,000) $ (2,476,000)  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months   6,500,000    
Cash flow hedge | Hedging derivative | Asset derivatives        
Derivative [Line Items]        
Notional Amount   1,750,000,000   $ 1,750,000,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)   (19,646,000) 11,978,000  
Cash Flow Hedges Derivative Instruments at Fair Value, Net   45,929,000   74,797,000
Fair value hedge | Hedging derivative        
Derivative [Line Items]        
Forecasted Notional Amount   3,287,139,000   3,287,139,000
Fair Value Hedge Assets [1]   44,557,000   43,706,000
Fair value hedge | Hedging derivative | Securities        
Derivative [Line Items]        
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 986,000 26,812,000 (31,685,000)  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge   (26,812,000) 31,685,000  
Derivative Instruments and Hedges, Assets   2,044,651,000   2,074,621,000
Fair Value Hedging Adjustment   (68,520,000)   (41,708,000)
Gain (Loss) on Fair Value Hedges Recognized in Earnings 9,700,000      
Fair value hedge | Hedging derivative | Securities | Asset derivatives        
Derivative [Line Items]        
Forecasted Notional Amount   $ 2,112,139,000   $ 543,061,000
Derivative Asset, Statement of Financial Position   Other assets   Other assets
Weighted Average Remaining Maturity   10 years 8 months 12 days    
Pay Rate (as percent)   2.81%    
Derivative, Type of Interest Rate Paid on Swap   Federal Funds/ SOFR    
Fair Value Hedge Assets [1]   $ 68,520,000   $ 42,983,000
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]        
Forecasted Notional Amount   $ 0   1,569,078,000
Weighted Average Remaining Maturity   0 years    
Pay Rate (as percent)   0.00%    
Derivative, Type of Interest Rate Paid on Swap   N/A    
Fair Value Hedge Assets   $ 0   $ (1,275,000)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other liabilities   Other liabilities
Fair value hedge | Hedging derivative | Securities | Federal Funds Rate        
Derivative [Line Items]        
Forecasted Notional Amount   $ 392,200,000    
Fair value hedge | Hedging derivative | Securities | Secured Overnight Financing Rate        
Derivative [Line Items]        
Forecasted Notional Amount   2,900,000,000    
Fair value hedge | Hedging derivative | Loans        
Derivative [Line Items]        
Amortization expense, reduction to interest income on loans   104,000 210,000  
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances        
Derivative [Line Items]        
Gain (Loss) on Fair Value Hedges Recognized in Earnings   (25,961,000) 1,883,000  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge   25,961,000 $ (1,883,000)  
Derivative Instruments and Hedges, Assets   1,151,037,000   $ 1,173,002,000
Fair Value Hedging Adjustment   (23,963,000)   (1,998,000)
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances | Asset derivatives        
Derivative [Line Items]        
Forecasted Notional Amount   $ 0   $ 750,000,000
Derivative Asset, Statement of Financial Position   Other assets   Other assets
Weighted Average Remaining Maturity   0 years    
Derivative, Type of Interest Rate Paid on Swap   N/A    
Fair Value Hedge Assets   $ 0   $ 3,654,000
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances | Liability derivatives        
Derivative [Line Items]        
Forecasted Notional Amount   $ 1,175,000,000   425,000,000
Weighted Average Remaining Maturity   3 years 5 months 23 days    
Pay Rate (as percent)   5.33%    
Derivative, Type of Interest Rate Paid on Swap   SOFR    
Fair Value Hedge Assets [1]   $ (23,963,000)   $ (1,656,000)
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   3 years 7 months 2 days    
Notional Amount   $ 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   $ 22,466,000   $ 36,483,000
Interest Rate Contract | Hedging derivative | Asset derivatives        
Derivative [Line Items]        
Derivative Asset, Statement of Financial Position   Other assets   Other assets
Weighted Average Remaining Maturity   3 years 7 months 2 days    
Notional Amount   $ 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   $ 23,463,000   $ 38,314,000
[1] The variation margin payments for derivatives cleared through central clearing houses are characterized as settlements. At March 31, 2024
and December 31, 2023, the notional amount of fair value derivatives cleared through central clearing houses was $2.0 billion with a fair value that approximates zero due to $27.8 million and $4.0 million in variation margin payments.