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Fair Value Disclosures - Level 3 Roll Forward (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Net Asset (Liability) Value [Roll Forward]    
Beginning balance $ 9,252 $ 141
Purchases/additions (1,681) (4,683)
Payments received (100) (91)
Increase (decrease) in value 1,886 4,138
Ending balance 9,357 (495)
Derivative Financial Instruments, Liabilities [Member] | Credit Risk Contract [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (535) (176)
Additions (1,681) (4,683)
Payments received 0 0
Increase (decrease) in value 1,866 4,143
Ending balance (350) (716)
Corporate Debt Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 9,600 0
Purchases/additions 0 0
Payments received 0 0
Increase (decrease) in value 25 0
Ending balance 9,625 0
Loans [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 187 317
Purchases/additions 0 0
Payments received (100) (91)
Increase (decrease) in value (5) (5)
Ending balance $ 82 $ 221