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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.

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