Fair Value Measurements Assets and Liabilities Measured and Recorded (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Securities, FV-NI	$ 1	$ 1
(amortized cost of $2,699,255 and $5,654,617, respectively)	2,346,864	4,843,487
Other Borrowings, Fair Value Disclosure	123,116	132,030
Credit-Link Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Borrowings, Fair Value Disclosure	123,116	132,030		$ 0
Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants Not Settleable in Cash, Fair Value Disclosure	3,689	4,048
Derivative Liability, Fair Value of Collateral	10,549	5,906
(amortized cost of $2,699,255 and $5,654,617, respectively)	2,346,864
Fair Value, Recurring | Government agency and government-sponsored enterprise pass through securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	1,187,609	2,242,042
Fair Value, Recurring | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	28,083	339,326
Fair Value, Recurring | Commercial Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	253,306	487,606
Fair Value, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	284,334	457,063
Fair Value, Recurring | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	4,968	670,070
Fair Value, Recurring | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	267,232	311,905
Fair Value, Recurring | Mortgage-backed Securities, Issued by Private Enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	20,813	26,827
Fair Value, Recurring | Collateralized Loan Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	108,416	102,261
Fair Value, Recurring | Private Label Collateralized Mortgage Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	158,412	166,724
Fair Value, Recurring | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	19,952	22,413
Fair Value, Recurring | SBA asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	13,739	17,250
Level 1 | Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants Not Settleable in Cash, Fair Value Disclosure	0	0
Derivative Liability, Fair Value of Collateral	0	0
Equity Securities, FV-NI	1	1
(amortized cost of $2,699,255 and $5,654,617, respectively)	4,968	670,070
Other Borrowings	0	0
Level 1 | Fair Value, Recurring | Government agency and government-sponsored enterprise pass through securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 1 | Fair Value, Recurring | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 1 | Fair Value, Recurring | Commercial Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 1 | Fair Value, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 1 | Fair Value, Recurring | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	4,968	670,070
Level 1 | Fair Value, Recurring | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 1 | Fair Value, Recurring | Mortgage-backed Securities, Issued by Private Enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 1 | Fair Value, Recurring | Collateralized Loan Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 1 | Fair Value, Recurring | Private Label Collateralized Mortgage Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 1 | Fair Value, Recurring | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 1 | Fair Value, Recurring | SBA asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 2 | Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants Not Settleable in Cash, Fair Value Disclosure	0	0
Derivative Liability, Fair Value of Collateral	10,549	5,906
Equity Securities, FV-NI	0	0
(amortized cost of $2,699,255 and $5,654,617, respectively)	2,301,647	4,173,417
Other Borrowings	0	0
Level 2 | Fair Value, Recurring | Government agency and government-sponsored enterprise pass through securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	1,187,609	2,242,042
Level 2 | Fair Value, Recurring | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	28,083	339,326
Level 2 | Fair Value, Recurring | Commercial Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	253,306	487,606
Level 2 | Fair Value, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	284,334	457,063
Level 2 | Fair Value, Recurring | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 2 | Fair Value, Recurring | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	226,983	311,905
Level 2 | Fair Value, Recurring | Mortgage-backed Securities, Issued by Private Enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	20,813	26,827
Level 2 | Fair Value, Recurring | Collateralized Loan Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	108,416	102,261
Level 2 | Fair Value, Recurring | Private Label Collateralized Mortgage Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	158,412	166,724
Level 2 | Fair Value, Recurring | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	19,952	22,413
Level 2 | Fair Value, Recurring | SBA asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	13,739	17,250
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants Not Settleable in Cash, Fair Value Disclosure		4,048	$ 3,555
Level 3 | Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Warrants Not Settleable in Cash, Fair Value Disclosure	3,689	4,048
Derivative Liability, Fair Value of Collateral	0	0
Equity Securities, FV-NI	0	0
(amortized cost of $2,699,255 and $5,654,617, respectively)	40,249	0
Other Borrowings	123,116	132,030
Level 3 | Fair Value, Recurring | Government agency and government-sponsored enterprise pass through securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 3 | Fair Value, Recurring | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 3 | Fair Value, Recurring | Commercial Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 3 | Fair Value, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 3 | Fair Value, Recurring | US Treasury Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 3 | Fair Value, Recurring | Corporate Debt Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	40,249	0
Level 3 | Fair Value, Recurring | Mortgage-backed Securities, Issued by Private Enterprises
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 3 | Fair Value, Recurring | Collateralized Loan Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 3 | Fair Value, Recurring | Private Label Collateralized Mortgage Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 3 | Fair Value, Recurring | Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	0	0
Level 3 | Fair Value, Recurring | SBA asset-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
(amortized cost of $2,699,255 and $5,654,617, respectively)	$ 0	$ 0