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Fair Value Measurements - Activity for Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Level 3 CMO [Roll Forward]      
Other Borrowings, Fair Value Disclosure $ 123,824 $ 123,116  
Proceeds from borrowings 300,000   $ 10,371,337
Unrealized net holding (losses) gains on securities available-for-sale arising during the period (18,208) 161,900 $ 67,971
Credit-Link Notes      
Level 3 CMO [Roll Forward]      
Other Borrowings, Fair Value Disclosure 123,824 123,116  
Level 3      
Level 3 CMO [Roll Forward]      
Equity warrants, Balance, beginning of period 3,689    
Total included in earnings 178    
Total included in other comprehensive income 0    
Payments for Repurchase of Warrants 0    
Sales, Equity Warrants 115    
Equity warrants, Balance, end of period   3,689  
Warrant income (loss) 272    
Fair Value, Equity, Transfers to Level 1, Amount 2    
Fair Value, Assets, Level 3 to Level 2 Transfers, Amount 0    
Level 3 | Credit-Link Notes      
Level 3 CMO [Roll Forward]      
Total included in earnings 348    
Total included in other comprehensive income 1,251    
Proceeds from borrowings 0    
Repayments of borrowings (891)    
Debt Securities Exercises and Settlements 0    
Fair Value, Equity, Transfers to Level 1, Amount 0    
Fair Value, Assets, Level 3 to Level 2 Transfers, Amount 0    
Level 3 | Corporate Debt Securities      
Level 3 CMO [Roll Forward]      
Total included in earnings 0    
Proceeds from borrowings 0    
Repayments of borrowings 0    
Debt Securities Exercises and Settlements 0    
Fair Value, Measurements, Recurring      
Level 3 CMO [Roll Forward]      
Equity warrants, Balance, beginning of period 3,689    
Equity warrants, Balance, end of period 3,708 3,689  
Fair Value, Measurements, Recurring | Level 3      
Level 3 CMO [Roll Forward]      
Equity warrants, Balance, beginning of period 3,689    
Equity warrants, Balance, end of period 3,708 3,689  
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 2,100 40,249  
Total included in other comprehensive income 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 40,249    
Fair Value, Measurements, Nonrecurring      
Level 3 CMO [Roll Forward]      
Assets 8,150 9,824  
Fair Value, Measurements, Nonrecurring | Non Purchased Credit Impaired Loans and Leases      
Level 3 CMO [Roll Forward]      
Assets 5,639 6,402  
Fair Value, Measurements, Nonrecurring | Level 3      
Level 3 CMO [Roll Forward]      
Assets 3,037 2,351  
Fair Value, Measurements, Nonrecurring | Level 3 | Non Purchased Credit Impaired Loans and Leases      
Level 3 CMO [Roll Forward]      
Assets 3,037 $ 2,351  
Fair Value, Measurements, Nonrecurring | Level 3 | No Discounts | Third party appraisals      
Level 3 CMO [Roll Forward]      
Assets 3,037    
Asset-backed | Fair Value, Measurements, Recurring | Level 3      
Level 3 CMO [Roll Forward]      
Unrealized net holding (losses) gains on securities available-for-sale arising during the period (900)    
Fair Value, Assets, Level 3 to Level 2 Transfers, Amount $ (38,149)