Fair Value Measurements - Activity for Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Level 3 CMO [Roll Forward]
Other Borrowings, Fair Value Disclosure	$ 123,782		$ 123,782		$ 132,030
Total included in earnings			0	$ (1,019)
Proceeds from (Repayments of) Debt			4,533,706	1,864,815
Unrealized net holding gains (losses) on securities available-for-sale arising during the period	(149,201)	$ (288,174)	$ (145,375)	$ (970,572)
Discounted Cash Flow
Level 3 CMO [Roll Forward]
Financing Receivable, before Allowance for Credit Loss, Average Yield			9.25%
Credit-Link Notes
Level 3 CMO [Roll Forward]
Other Borrowings, Fair Value Disclosure	123,782		$ 123,782		132,030
Level 3
Level 3 CMO [Roll Forward]
Equity warrants, Balance, beginning of period			4,048
Total included in earnings			(545)
Total included in other comprehensive income			0
Payments for Repurchase of Warrants			0
Sales, Equity Warrants			524
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount			0
Warrant (loss) income			184
Fair Value, Equity, Transfers to Level 1, Amount			36
Level 3 | Credit-Link Notes
Level 3 CMO [Roll Forward]
Total included in earnings			3,896
Total included in other comprehensive income			(7,107)
Proceeds from Issuance of Debt			0
Proceeds from (Repayments of) Debt			(5,037)
Debt Securities Exercises and Settlements			0
Fair Value, Equity, Transfers to Level 1, Amount			0
Level 3 | Corporate Debt Securities
Level 3 CMO [Roll Forward]
Total included in earnings			0
Proceeds from Issuance of Debt			0
Proceeds from (Repayments of) Debt			0
Fair Value, Equity, Level 2 to Level 1 Transfers, Description			3,000
Debt Securities Exercises and Settlements			0
Fair Value, Measurements, Recurring
Level 3 CMO [Roll Forward]
Equity warrants, Balance, beginning of period			4,048
Equity warrants, Balance, end of period	3,807		3,807
Fair Value, Measurements, Recurring | Level 3
Level 3 CMO [Roll Forward]
Equity warrants, Balance, beginning of period			4,048
Equity warrants, Balance, end of period	3,807		3,807
Fair Value, Measurements, Recurring | Level 3 | Corporate Debt Securities
Level 3 CMO [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	2,364		2,364
Total included in other comprehensive income			(636)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value			0
Fair Value, Measurements, Nonrecurring
Level 3 CMO [Roll Forward]
Assets	34,665		34,665		34,124
Fair Value, Measurements, Nonrecurring | Non Purchased Credit Impaired Loans and Leases
Level 3 CMO [Roll Forward]
Assets	34,343		34,343		34,077
Fair Value, Measurements, Nonrecurring | Level 3
Level 3 CMO [Roll Forward]
Assets	6,109		6,109		6,012
Fair Value, Measurements, Nonrecurring | Level 3 | Non Purchased Credit Impaired Loans and Leases
Level 3 CMO [Roll Forward]
Assets	6,109		$ 6,109		$ 6,012
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted Cash Flow | Minimum | Non Purchased Credit Impaired Loans and Leases | Measurement Input, Discount Rate
Level 3 CMO [Roll Forward]
Discount rates			0.0925
Fair Value, Measurements, Nonrecurring | Level 3 | Discounted Cash Flow | Maximum | Non Purchased Credit Impaired Loans and Leases | Measurement Input, Discount Rate
Level 3 CMO [Roll Forward]
Discount rates			0.0925
Fair Value, Measurements, Nonrecurring | Level 3 | Discount Rates | Discounted Cash Flow
Level 3 CMO [Roll Forward]
Assets	1,504		$ 1,504
Fair Value, Measurements, Nonrecurring | Level 3 | No Discounts | Third party appraisals
Level 3 CMO [Roll Forward]
Assets	$ 4,605		4,605
Asset-backed | Fair Value, Measurements, Recurring | Level 3
Level 3 CMO [Roll Forward]
Unrealized net holding gains (losses) on securities available-for-sale arising during the period			$ (636)