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Fair Value Disclosures - Level 3 Roll Forward (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Net Asset (Liability) Value [Roll Forward]    
Beginning balance $ 141 $ 27,436
Purchases/additions (4,683) (958)
Payments received (91) (1,432)
Increase (decrease) in value 4,138 1,444
Ending balance (495) 26,490
Derivative Financial Instruments, Liabilities [Member] | Credit Risk Contract [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance (176) (72)
Additions (4,683) (958)
Payments received 0 0
Increase (decrease) in value 4,143 767
Ending balance (716) (263)
Corporate Debt Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance   25,729
Purchases/additions   0
Payments received   0
Increase in value   675
Ending balance   26,404
Loans [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 317 1,779
Purchases/additions 0 0
Payments received (91) (1,432)
Increase in value (5) 2
Ending balance $ 221 $ 349