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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, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	$ 1	$ 1
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively)	2,286,682	2,346,864
Other Borrowings, Fair Value Disclosure	123,824	123,116
Securities available-for-sale, at fair value	2,286,682	2,346,864
Credit-Link Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Borrowings, Fair Value Disclosure	123,824	123,116
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 $2,657,281 and $2,699,255, respectively)	281,569	284,334
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 $2,657,281 and $2,699,255, respectively)	109,078	108,416
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 $2,657,281 and $2,699,255, respectively)	33,259	28,083
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 $2,657,281 and $2,699,255, respectively)	243,387	253,306
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 $2,657,281 and $2,699,255, respectively)	12,911	13,739
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 $2,657,281 and $2,699,255, respectively)	277,198	267,232
U.S. Treasury 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 $2,657,281 and $2,699,255, respectively)		4,968
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 $2,657,281 and $2,699,255, respectively)	19,491	20,813
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 $2,657,281 and $2,699,255, respectively)	153,412	158,412
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 $2,657,281 and $2,699,255, respectively)	18,908	19,952
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity warrants		3,689
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity warrants	3,708	3,689
Interest rate and economic contracts	10,205	8,309
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively)	2,286,682
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 $2,657,281 and $2,699,255, respectively)	1,137,469	1,187,609
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 $2,657,281 and $2,699,255, respectively)	281,569	284,334
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 $2,657,281 and $2,699,255, respectively)	109,078	108,416
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 $2,657,281 and $2,699,255, respectively)	33,259	28,083
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 $2,657,281 and $2,699,255, respectively)	243,387	253,306
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 $2,657,281 and $2,699,255, respectively)	12,911	13,739
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 $2,657,281 and $2,699,255, respectively)	277,198	267,232
Fair Value, Measurements, Recurring | U.S. Treasury 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 $2,657,281 and $2,699,255, respectively)		4,968
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 $2,657,281 and $2,699,255, respectively)	19,491	20,813
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 $2,657,281 and $2,699,255, respectively)	153,412	158,412
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 $2,657,281 and $2,699,255, respectively)	18,908	19,952
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity warrants	0	0
Interest rate and economic contracts	0	0
Equity Securities, FV-NI	1	1
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively)	0	4,968
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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, respectively)	0	0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury 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 $2,657,281 and $2,699,255, respectively)		4,968
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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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	0
Interest rate and economic contracts	10,205	8,309
Equity Securities, FV-NI	0	0
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively)	2,284,582	2,301,647
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 $2,657,281 and $2,699,255, respectively)	1,137,469	1,187,609
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 $2,657,281 and $2,699,255, respectively)	281,569	284,334
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 $2,657,281 and $2,699,255, respectively)	109,078	108,416
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 $2,657,281 and $2,699,255, respectively)	33,259	28,083
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 $2,657,281 and $2,699,255, respectively)	243,387	253,306
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 $2,657,281 and $2,699,255, respectively)	12,911	13,739
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 $2,657,281 and $2,699,255, respectively)	275,098	226,983
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury 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 $2,657,281 and $2,699,255, respectively)		0
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 $2,657,281 and $2,699,255, respectively)	19,491	20,813
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 $2,657,281 and $2,699,255, respectively)	153,412	158,412
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 $2,657,281 and $2,699,255, respectively)	18,908	19,952
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity warrants	3,708	3,689
Interest rate and economic contracts	0	0
Equity Securities, FV-NI	0	0
Securities available-for-sale, at fair value, net of allowance for credit losses (amortized cost of $2,657,281 and $2,699,255, respectively)	2,100	40,249
Other Borrowings	123,824	123,116
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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, respectively)	2,100	40,249
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury 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 $2,657,281 and $2,699,255, respectively)		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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, 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 $2,657,281 and $2,699,255, respectively)	$ 0	$ 0

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