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Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity Securities, FV-NI |  | $ 2 |  | $ 3
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 2,334,058 |  | 2,246,839
Other Borrowings, Fair Value Disclosure |  | 117,196 |  | 118,838
Securities available-for-sale, at fair value |  | 2,334,058 |  | 2,246,839
Credit-Link Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other Borrowings, Fair Value Disclosure |  | 117,196 |  | 118,838
Agency residential CMOs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 565,068 |  | 446,631
Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 242,885 |  | 279,416
Municipal securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 597 |  | 594
Agency commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 61,204 |  | 51,564
SBA securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 3,862 |  | 4,200
Corporate Debt Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 263,403 |  | 257,712
Private label commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 11,446 |  | 12,372
Private Label Collateralized Mortgage Obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 303,327 |  | 316,910
Asset-backed Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 15,224 |  | 15,600
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity warrants |  |  |  | 3,763
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity warrants |  | 3,497 | [1] | 3,763
Interest rate and foreign exchange contracts |  | 5,877 | [1] | 7,031
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 2,334,058 |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | [1] | 2,081 |  | 1,442
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise pass through securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 867,042 |  | 861,840
Fair Value, Measurements, Recurring | Agency residential CMOs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 565,068 |  | 446,631
Fair Value, Measurements, Recurring | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 242,885 |  | 279,416
Fair Value, Measurements, Recurring | Municipal securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 597 |  | 594
Fair Value, Measurements, Recurring | Agency commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 61,204 |  | 51,564
Fair Value, Measurements, Recurring | SBA securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 3,862 |  | 4,200
Fair Value, Measurements, Recurring | Corporate Debt Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 263,403 |  | 257,712
Fair Value, Measurements, Recurring | Private label commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 11,446 |  | 12,372
Fair Value, Measurements, Recurring | Private Label Collateralized Mortgage Obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 303,327 |  | 316,910
Fair Value, Measurements, Recurring | Asset-backed Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 15,224 |  | 15,600
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity warrants |  | 0 | [1] | 0
Interest rate and foreign exchange contracts |  | 0 | [1] | 0
Equity Securities, FV-NI |  | 2 |  | 3
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Other Borrowings |  | 0 |  | 0
Cash Flow Hedge Derivative Instrument Assets at Fair Value | [1] | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | Government agency and government-sponsored enterprise pass through securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | Agency residential CMOs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | Agency commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | SBA securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | Corporate Debt Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | Private label commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | Private Label Collateralized Mortgage Obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity warrants |  | 0 | [1] | 0
Interest rate and foreign exchange contracts |  | 5,877 | [1] | 7,031
Equity Securities, FV-NI |  | 0 |  | 0
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 2,331,898 |  | 2,244,709
Other Borrowings |  | 0 |  | 0
Cash Flow Hedge Derivative Instrument Assets at Fair Value | [1] | 2,081 |  | 1,442
Fair Value, Measurements, Recurring | Level 2 | Government agency and government-sponsored enterprise pass through securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 867,042 |  | 861,840
Fair Value, Measurements, Recurring | Level 2 | Agency residential CMOs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 565,068 |  | 446,631
Fair Value, Measurements, Recurring | Level 2 | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 242,885 |  | 279,416
Fair Value, Measurements, Recurring | Level 2 | Municipal securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 597 |  | 594
Fair Value, Measurements, Recurring | Level 2 | Agency commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 61,204 |  | 51,564
Fair Value, Measurements, Recurring | Level 2 | SBA securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 3,862 |  | 4,200
Fair Value, Measurements, Recurring | Level 2 | Corporate Debt Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 261,243 |  | 255,582
Fair Value, Measurements, Recurring | Level 2 | Private label commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 11,446 |  | 12,372
Fair Value, Measurements, Recurring | Level 2 | Private Label Collateralized Mortgage Obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 303,327 |  | 316,910
Fair Value, Measurements, Recurring | Level 2 | Asset-backed Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 15,224 |  | 15,600
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity warrants |  | 3,497 | [1] | 3,763
Interest rate and foreign exchange contracts |  | 0 | [1] | 0
Equity Securities, FV-NI |  | 0 |  | 0
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 2,160 |  | 2,130
Other Borrowings |  | 117,196 |  | 118,838
Cash Flow Hedge Derivative Instrument Assets at Fair Value | [1] | 0 |  | 0
Fair Value, Measurements, Recurring | Level 3 | Government agency and government-sponsored enterprise pass through securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 3 | Agency residential CMOs |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 3 | Collateralized loan obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 3 | Agency commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 3 | SBA securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 3 | Corporate Debt Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 2,160 |  | 2,130
Fair Value, Measurements, Recurring | Level 3 | Private label commercial MBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 3 | Private Label Collateralized Mortgage Obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | 0 |  | 0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively) |  | $ 0 |  | $ 0
[1] | For information regarding derivative instruments, see Note 9. Derivatives

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