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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.

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