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Fair Value Measurements (Change in Fair Value of Securities Using Level 3 Inputs) (Details) - Available-for-sale Securities [Member] - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31, $ 0  
Total net (losses) gains for the period included in OCI (36)  
Purchases 0  
Sales 0  
Issuances 0  
Settlements 0  
Transfers into Level 3 2,890  
Transfers out of Level 3 0  
Fair value, September 30 2,854  
Period change unrealized (losses) gains in earnings for assets held at period end 0  
Period change unrealized gains (losses) in OCI for assets held at period end (36)  
Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31, 17,051 $ 0
Total net (losses) gains for the period included in OCI (2,415) (69)
Purchases 19,002 0
Sales 0 0
Issuances 0 0
Settlements (138) 0
Transfers into Level 3 4,592 16,419
Transfers out of Level 3 0 0
Fair value, September 30 37,636 16,350
Period change unrealized (losses) gains in earnings for assets held at period end (456) 0
Period change unrealized gains (losses) in OCI for assets held at period end (2,415)  
Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31, 17,034 7,409
Total net (losses) gains for the period included in OCI 732 (14)
Purchases 11,751 18,404
Sales 0 0
Issuances 0 0
Settlements (1,030) (105)
Transfers into Level 3 26,401 13,603
Transfers out of Level 3 (9,924) (19,662)
Fair value, September 30 44,720 19,879
Period change unrealized (losses) gains in earnings for assets held at period end (247) 0
Period change unrealized gains (losses) in OCI for assets held at period end 732  
Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31, 34,085 7,409
Total net (losses) gains for the period included in OCI (1,719) (83)
Purchases 30,753 18,404
Sales 0 0
Issuances 0 0
Settlements (1,168) (105)
Transfers into Level 3 33,883 30,022
Transfers out of Level 3 (9,924) (19,662)
Fair value, September 30 85,210 36,229
Period change unrealized (losses) gains in earnings for assets held at period end (703) 0
Period change unrealized gains (losses) in OCI for assets held at period end (1,719)  
Gain (Loss) on Investments [Member] | Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains for the period included in net income 0  
Gain (Loss) on Investments [Member] | Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains for the period included in net income (456)  
Gain (Loss) on Investments [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains for the period included in net income (247)  
Gain (Loss) on Investments [Member] | Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains for the period included in net income (703)  
Net Investment Income Earned [Member] | Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains for the period included in net income 0  
Net Investment Income Earned [Member] | Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains for the period included in net income 0 0
Net Investment Income Earned [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains for the period included in net income 3 244
Net Investment Income Earned [Member] | Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains for the period included in net income $ 3 $ 244