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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
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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