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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
6 Months Ended
Jun. 30, 2020
Jun. 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 (111)  
Purchases 0  
Sales 0  
Issuances 0  
Settlements 0  
Transfers into Level 3 2,890  
Transfers out of Level 3 0  
Fair value, June 30 2,779  
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 (111)  
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 (1,770) (19)
Purchases 3,002 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, June 30 22,353 16,400
Period change unrealized (losses) gains in earnings for assets held at period end (384) 0
Period change unrealized gains (losses) in OCI for assets held at period end (1,770)  
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 (367) (118)
Purchases 9,690 15,984
Sales 0 0
Issuances 0 0
Settlements (1,032) (40)
Transfers into Level 3 20,107 13,603
Transfers out of Level 3 (9,924) (19,662)
Fair value, June 30 35,160 17,420
Period change unrealized (losses) gains in earnings for assets held at period end (349) 0
Period change unrealized gains (losses) in OCI for assets held at period end (367)  
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 (2,248) (137)
Purchases 12,692 15,984
Sales 0 0
Issuances 0 0
Settlements (1,170) (40)
Transfers into Level 3 27,589 30,022
Transfers out of Level 3 (9,924) (19,662)
Fair value, June 30 60,292 33,820
Period change unrealized (losses) gains in earnings for assets held at period end (733) 0
Period change unrealized gains (losses) in OCI for assets held at period end (2,248)  
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 (384)  
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 (349)  
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 (733)  
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 1 244
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 $ 1 $ 244