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Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands		Sep. 30, 2025		Dec. 31, 2024
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)		$ 2,426,734		$ 2,246,839
Equity Securities, FV-NI		3		3
Other Borrowings, Fair Value Disclosure		115,022		118,838
Credit-Link Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Borrowings, Fair Value Disclosure		115,022		118,838
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)		50,882		51,564
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)		781,982		446,631
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)				594
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)		256,948		257,712
Private label 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)		258,693		316,910
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)		206,474		279,416
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)		10,274		12,372
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)		13,882		15,600
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)		3,444		4,200
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]
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,575,393 and $2,526,64, respectively)		2,426,734
Interest rate and foreign exchange contracts		4,396	[1]	7,031
Equity warrants		3,418	[1]	3,763
Cash Flow Hedge Derivative Instrument Assets at Fair Value	[1]	4,394		1,442
Derivative Liability, Fair Value of Collateral		4,343	[1]	7,562
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)		844,155		861,840
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)		50,882		51,564
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)		781,982		446,631
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)				594
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)		256,948		257,712
Fair Value, Measurements, Recurring | Private label 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)		258,693		316,910
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)		206,474		279,416
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)		10,274		12,372
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)		13,882		15,600
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)		3,444		4,200
Fair Value, Measurements, Recurring | Level 1
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
Equity Securities, FV-NI		3		3
Interest rate and foreign exchange contracts		0	[1]	0
Equity warrants		0	[1]	0
Cash Flow Hedge Derivative Instrument Assets at Fair Value	[1]	0		0
Derivative Liability, Fair Value of Collateral		0	[1]	0
Other Borrowings		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 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 | 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 | 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
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 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 | 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 | 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 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 2
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)		2,424,409		2,244,709
Equity Securities, FV-NI		0		0
Interest rate and foreign exchange contracts		4,396	[1]	7,031
Equity warrants		0	[1]	0
Cash Flow Hedge Derivative Instrument Assets at Fair Value	[1]	4,394		1,442
Derivative Liability, Fair Value of Collateral		4,343	[1]	7,562
Other Borrowings		0		0
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)		844,155		861,840
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)		50,882		51,564
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)		781,982		446,631
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)				594
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)		254,623		255,582
Fair Value, Measurements, Recurring | Level 2 | Private label 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)		258,693		316,910
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)		206,474		279,416
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)		10,274		12,372
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)		13,882		15,600
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)		3,444		4,200
Fair Value, Measurements, Recurring | Level 3
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)		2,325		2,130
Equity Securities, FV-NI		0		0
Interest rate and foreign exchange contracts		0	[1]	0
Equity warrants		3,418	[1]	3,763
Cash Flow Hedge Derivative Instrument Assets at Fair Value	[1]	0		0
Derivative Liability, Fair Value of Collateral		0	[1]	0
Other Borrowings		115,022		118,838
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 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 | 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 | 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
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)		2,325		2,130
Fair Value, Measurements, Recurring | Level 3 | Private label 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 | 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 | 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 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
[1] For information regarding derivative instruments, see Note 9. Derivatives

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