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Derivative Instruments - Hedge Derivatives (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2022
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Derivative [Line Items]            
Net gain on cash flow hedges reclassified from other comprehensive income into net income, net of tax   $ (2,473,000) $ (2,268,000) $ (4,945,000) $ (4,744,000)  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months       4,100,000    
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)   (3,497,000) (23,339,000) (23,143,000) (11,361,000)  
Cash Flow Hedges Derivative Instruments at Fair Value, Net   37,613,000   37,613,000   74,797,000
Fair value hedge | Hedging derivative            
Derivative [Line Items]            
Forecasted Notional Amount   4,009,186,000   4,009,186,000   3,287,139,000
Fair Value Hedge Assets [1]   48,932,000   48,932,000   43,706,000
Fair value hedge | Hedging derivative | Securities            
Derivative [Line Items]            
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 986,000 10,096,000 33,510,000 36,908,000 1,825,000  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge   (10,096,000) (33,510,000) (36,908,000) (1,825,000)  
Derivative Instruments and Hedges, Assets   2,777,707,000   2,777,707,000   2,074,621,000
Fair Value Hedging Adjustment   (78,616,000)   (78,616,000)   (41,708,000)
Gain (Loss) on Fair Value Hedges Recognized in Earnings 5,900,000          
Fair value hedge | Hedging derivative | Securities | Asset derivatives            
Derivative [Line Items]            
Forecasted Notional Amount   $ 2,834,186,000   $ 2,834,186,000   $ 543,061,000
Derivative Asset, Statement of Financial Position   Other assets   Other assets   Other assets
Weighted Average Remaining Maturity       11 years 9 months 10 days    
Pay Rate (as percent)   3.12%   3.12%    
Derivative, Type of Interest Rate Paid on Swap       Federal Funds/ SOFR    
Fair Value Hedge Assets [1]   $ 78,616,000   $ 78,616,000   $ 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   $ 0   1,569,078,000
Weighted Average Remaining Maturity       0 years    
Pay Rate (as percent)   0.00%   0.00%    
Derivative, Type of Interest Rate Paid on Swap       N/A    
Fair Value Hedge Assets   $ 0   $ 0   $ (1,275,000)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other liabilities   Other liabilities   Other liabilities
Fair value hedge | Hedging derivative | Securities | Federal Funds Rate            
Derivative [Line Items]            
Forecasted Notional Amount   $ 363,900,000   $ 363,900,000    
Fair value hedge | Hedging derivative | Securities | Secured Overnight Financing Rate            
Derivative [Line Items]            
Forecasted Notional Amount   3,600,000,000   3,600,000,000    
Fair value hedge | Hedging derivative | Loans            
Derivative [Line Items]            
Amortization expense, reduction to interest income on loans   93,000 168,000 197,000 378,000  
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances            
Derivative [Line Items]            
Gain (Loss) on Fair Value Hedges Recognized in Earnings   (5,721,000) (15,780,000) (31,682,000) (13,897,000)  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge   5,721,000 $ 15,780,000 31,682,000 $ 13,897,000  
Derivative Instruments and Hedges, Assets   1,145,316,000   1,145,316,000   $ 1,173,002,000
Fair Value Hedging Adjustment   (29,684,000)   (29,684,000)   (1,998,000)
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances | Asset derivatives            
Derivative [Line Items]            
Forecasted Notional Amount   $ 0   $ 0   $ 750,000,000
Derivative Asset, Statement of Financial Position   Other assets   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   $ 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   $ 1,175,000,000   425,000,000
Weighted Average Remaining Maturity       3 years 2 months 23 days    
Pay Rate (as percent)   3.52%   3.52%    
Derivative, Type of Interest Rate Paid on Swap       SOFR    
Fair Value Hedge Assets [1]   $ (29,684,000)   $ (29,684,000)   $ (1,656,000)
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       3 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   $ 18,387,000   $ 18,387,000   $ 36,483,000
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       3 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   $ 19,226,000   $ 19,226,000   $ 38,314,000
[1] The variation margin payments for derivatives cleared through central clearing houses are characterized as settlements. At June 30, 2024
and December 31, 2023, the notional amount of fair value derivatives cleared through central clearing houses was $2.7 billion and $2.0 billion with a fair value that approximates zero due to $46.8 million and $4.0 million in variation margin payments.