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Derivative Instruments - Hedge Derivatives (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2022
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Derivative [Line Items]            
Net gain on cash flow hedges reclassified from other comprehensive income into net income, net of tax   $ 0 $ (2,433,000) $ 0 $ (7,378,000)  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months       0    
Hedging derivative | Securities            
Derivative [Line Items]            
Notional Amount   300,000,000   300,000,000    
Cash flow hedge | Hedging derivative | Asset derivatives            
Derivative [Line Items]            
Notional Amount   8,750,000,000   8,750,000,000   $ 1,750,000,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)   (9,970,000) 24,430,000 229,000 1,287,000  
Cash Flow Hedges Derivative Instruments at Fair Value, Net   83,501,000   83,501,000   32,818,000
Fair value hedge | Hedging derivative            
Derivative [Line Items]            
Forecasted Notional Amount   4,361,471,000   4,361,471,000   4,373,426,000
Fair Value Hedge Assets [1]   41,119,000   41,119,000   45,636,000
Fair value hedge | Hedging derivative | Securities            
Derivative [Line Items]            
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 986,000 (2,060,000) (59,423,000) (23,401,000) (22,515,000)  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge   2,060,000 59,423,000 23,401,000 22,515,000  
Derivative Instruments and Hedges, Assets   3,798,677,000   3,798,677,000   3,905,016,000
Fair Value Hedging Adjustment   (43,663,000)   (43,663,000)   (67,064,000)
Gain (Loss) on Fair Value Hedges Recognized in Earnings 4,800,000          
Fair value hedge | Hedging derivative | Securities | Asset derivatives            
Derivative [Line Items]            
Forecasted Notional Amount   $ 3,186,471,000   $ 3,186,471,000   3,198,426,000
Weighted Average Remaining Maturity       10 years 7 days    
Pay Rate (as percent)   3.37%   3.37%    
Derivative, Type of Interest Rate Paid on Swap       Federal Funds/ SOFR    
Fair Value Hedge Assets [1]   $ 43,663,000   $ 43,663,000   67,064,000
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 | Federal Funds Rate            
Derivative [Line Items]            
Forecasted Notional Amount   202,400,000   202,400,000    
Fair value hedge | Hedging derivative | Securities | Secured Overnight Financing Rate            
Derivative [Line Items]            
Forecasted Notional Amount   4,200,000,000   4,200,000,000    
Fair value hedge | Hedging derivative | Loans            
Derivative [Line Items]            
Amortization expense, reduction to interest income on loans   41,000 67,000 144,000 264,000  
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances            
Derivative [Line Items]            
Gain (Loss) on Fair Value Hedges Recognized in Earnings   1,560,000 30,679,000 18,884,000 (1,003,000)  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge   (1,560,000) $ (30,679,000) (18,884,000) $ 1,003,000  
Derivative Instruments and Hedges, Assets   1,172,456,000   1,172,456,000   1,196,428,000
Fair Value Hedging Adjustment   (2,544,000)   (2,544,000)   (21,428,000)
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   1,175,000,000
Weighted Average Remaining Maturity       1 year 11 months 23 days    
Pay Rate (as percent)   3.44%   3.44%    
Derivative, Type of Interest Rate Paid on Swap       SOFR    
Fair Value Hedge Assets [1]   $ (2,544,000)   $ (2,544,000)   (21,428,000)
Interest Rate Floor | Asset derivatives            
Derivative [Line Items]            
Notional Amount   3,300,000,000   $ 3,300,000,000    
Interest Rate Floor | Hedging derivative | Asset derivatives            
Derivative [Line Items]            
Weighted Average Remaining Maturity       3 years 11 months 1 day    
Notional Amount   4,125,000,000   $ 4,125,000,000   875,000,000
Derivative, Type of Interest Received       2.00%-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   40,970,000   $ 40,970,000   15,566,000
Derivative, Cost of Hedge Net of Cash Received       $ 31,200,000    
Interest Rate Contract | Hedging derivative | Asset derivatives            
Derivative [Line Items]            
Weighted Average Remaining Maturity       2 years 1 month 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   20,742,000   $ 20,742,000   17,252,000
Interest Rate Cap | Asset derivatives            
Derivative [Line Items]            
Notional Amount   3,800,000,000   $ 3,800,000,000    
Interest Rate Cap | Hedging derivative | Asset derivatives            
Derivative [Line Items]            
Weighted Average Remaining Maturity       3 years    
Notional Amount   3,750,000,000   $ 3,750,000,000   0
Derivative, Type of Interest Received       N/A    
Derivative, Type Of Interest Rate Paid On Swap1       3.25%-4.00% minus USD-Federal Funds    
Cash Flow Hedges Derivative Instruments at Fair Value, Net   $ 21,789,000   $ 21,789,000   $ 0
Derivative, Cost of Hedge Net of Cash Received       $ 35,400,000    
[1] The variation margin payments for derivatives cleared through central clearing houses are characterized as settlements. At September 30, 2025 and December 31, 2024, the notional amount of fair value derivatives cleared through central clearing houses was $3.1 billion and $3.0 billion, respectively, with a fair value that approximates zero due to $22.8 million and $72.7 million in variation margin payments.