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Fair Value Disclosures - Level 3 Roll Forward (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Net Asset (Liability) Value [Roll Forward]    
Beginning balance $ 141 $ 27,436
Purchases/additions (2,541) (670)
Payments received (60) (78)
Increase (decrease) in value 1,803 1,802
Ending balance (657) 28,490
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 (2,541) (670)
Payments received 0 0
Increase (decrease) in value 1,805 582
Ending balance (912) (160)
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   1,196
Ending balance   26,925
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 (60) (78)
Increase in value (2) 24
Ending balance $ 255 $ 1,725