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Derivative Instruments - Hedge Derivatives (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2022
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 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   $ (2,473,000) $ 0 $ (4,945,000)  
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   5,250,000,000     5,250,000,000   $ 1,750,000,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)   1,632,000   (3,497,000) 10,199,000 (23,143,000)  
Cash Flow Hedges Derivative Instruments at Fair Value, Net   70,308,000     70,308,000   32,818,000
Fair value hedge | Hedging derivative              
Derivative [Line Items]              
Forecasted Notional Amount   4,431,176,000     4,431,176,000   4,373,426,000
Fair Value Hedge Assets [1]   41,619,000     41,619,000   45,636,000
Fair value hedge | Hedging derivative | Securities              
Derivative [Line Items]              
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 986,000 (4,640,000)   10,096,000 (21,341,000) 36,908,000  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge   4,640,000   (10,096,000) 21,341,000 (36,908,000)  
Derivative Instruments and Hedges, Assets   3,901,806,000     3,901,806,000   3,905,016,000
Fair Value Hedging Adjustment   (45,723,000)     (45,723,000)   (67,064,000)
Gain (Loss) on Fair Value Hedges Recognized in Earnings 5,000,000.0            
Fair value hedge | Hedging derivative | Securities | Asset derivatives              
Derivative [Line Items]              
Forecasted Notional Amount   $ 3,256,176,000     $ 3,256,176,000   $ 3,198,426,000
Derivative Asset, Statement of Financial Position   Other assets     Other assets   Other assets
Weighted Average Remaining Maturity         10 years 18 days    
Pay Rate (as percent)   3.33%     3.33%    
Derivative, Type of Interest Rate Paid on Swap         Federal Funds/ SOFR    
Fair Value Hedge Assets [1]   $ 45,723,000     $ 45,723,000   $ 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   244,400,000     244,400,000    
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   49,000   93,000 103,000 197,000  
Fair value hedge | Hedging derivative | Federal Home Loan Bank Advances              
Derivative [Line Items]              
Gain (Loss) on Fair Value Hedges Recognized in Earnings   5,609,000   (5,721,000) 17,324,000 (31,682,000)  
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge   (5,609,000)   $ 5,721,000 (17,324,000) $ 31,682,000  
Derivative Instruments and Hedges, Assets   1,170,896,000     1,170,896,000   1,196,428,000
Fair Value Hedging Adjustment   (4,104,000)     (4,104,000)   (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         2 years 2 months 23 days    
Pay Rate (as percent)   3.48%     3.48%    
Derivative, Type of Interest Rate Paid on Swap         SOFR    
Fair Value Hedge Assets [1]   $ (4,104,000)     $ (4,104,000)   $ (21,428,000)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]   Other liabilities     Other liabilities   Other liabilities
Interest Rate Floor | Asset derivatives              
Derivative [Line Items]              
Notional Amount   $ 1,500,000,000     $ 1,500,000,000    
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 9 months 21 days    
Notional Amount   $ 2,375,000,000     $ 2,375,000,000   $ 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   $ 31,340,000     $ 31,340,000   $ 15,566,000
Derivative, Cost of Hedge Net of Cash Received         $ 11,800,000    
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         2 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   $ 22,746,000     $ 22,746,000   $ 17,252,000
Interest Rate Cap | Asset derivatives              
Derivative [Line Items]              
Notional Amount     $ 2,000,000,000        
Interest Rate Cap | 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   $ 2,000,000,000     $ 2,000,000,000   $ 0
Derivative, Type of Interest Received         N/A    
Derivative, Type Of Interest Rate Paid On Swap1         3.50%-4.00% minus USD-Federal Funds    
Cash Flow Hedges Derivative Instruments at Fair Value, Net   $ 16,222,000     $ 16,222,000   $ 0
Derivative, Cost of Hedge Net of Cash Received     $ 22,900,000        
[1] The variation margin payments for derivatives cleared through central clearing houses are characterized as settlements. At June 30, 2025 and December 31, 2024, the notional amount of fair value derivatives cleared through central clearing houses was $3.2 billion and $3.0 billion, respectively, with a fair value that approximates zero due to $26.2 million and $72.7 million in variation margin payments.