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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, 2022
Jun. 30, 2021
Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 $ 7,745 $ 2,894
Total net (losses) gains for the period included in OCI (581) (13)
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 5,101
Transfers out of Level 3 0 0
Fair value, June 30 7,008 7,982
Change in unrealized losses (gains) for the period included in earnings for assets held at period end (156) 0
Change in unrealized losses (gains) for the period included in OCI for assets held at period end (581) (13)
Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 114,127 70,700
Total net (losses) gains for the period included in OCI (16,422) 1,899
Purchases 55,343 25,403
Sales 0 0
Issuances 0 0
Settlements (3,903) (167)
Transfers into Level 3 19,214 0
Transfers out of Level 3 (7,037) (7,454)
Fair value, June 30 159,289 90,405
Change in unrealized losses (gains) for the period included in earnings for assets held at period end (2,047) 11
Change in unrealized losses (gains) for the period included in OCI for assets held at period end (16,424) 1,899
Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 124,909 56,375
Total net (losses) gains for the period included in OCI (8,592) 396
Purchases 39,133 17,639
Sales 0 0
Issuances 0 0
Settlements (6,479) (1,429)
Transfers into Level 3 0 3,226
Transfers out of Level 3 (24,646) (5,394)
Fair value, June 30 123,616 70,737
Change in unrealized losses (gains) for the period included in earnings for assets held at period end (777) (82)
Change in unrealized losses (gains) for the period included in OCI for assets held at period end (8,551) 396
Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 251,282 129,969
Total net (losses) gains for the period included in OCI (26,058) 2,282
Purchases 94,476 43,042
Sales 0 0
Issuances 0 0
Settlements (10,405) (1,596)
Transfers into Level 3 19,214 8,327
Transfers out of Level 3 (35,331) (12,848)
Fair value, June 30 290,320 169,124
Change in unrealized losses (gains) for the period included in earnings for assets held at period end (2,987) (71)
Change in unrealized losses (gains) for the period included in OCI for assets held at period end (26,019) 2,282
Residential Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 245  
Total net (losses) gains for the period included in OCI (17)  
Purchases 0  
Sales 0  
Issuances 0  
Settlements (11)  
Transfers into Level 3 0  
Transfers out of Level 3 (217)  
Fair value, June 30 0  
Change in unrealized losses (gains) for the period included in earnings for assets held at period end 0  
Change in unrealized losses (gains) for the period included in OCI for assets held at period end (17)  
Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 4,256  
Total net (losses) gains for the period included in OCI (446)  
Purchases 0  
Sales 0  
Issuances 0  
Settlements (12)  
Transfers into Level 3 0  
Transfers out of Level 3 (3,431)  
Fair value, June 30 407  
Change in unrealized losses (gains) for the period included in earnings for assets held at period end (7)  
Change in unrealized losses (gains) for the period included in OCI for assets held at period end (446)  
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 in the period included in net realized and unrealized (losses) gains (156) 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 in the period included in net realized and unrealized (losses) gains (2,047) 11
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 in the period included in net realized and unrealized (losses) gains (777) (82)
Gain (Loss) on Investments [Member] | Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains in the period included in net realized and unrealized (losses) gains (2,987) (71)
Gain (Loss) on Investments [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains in the period included in net realized and unrealized (losses) gains 0  
Gain (Loss) on Investments [Member] | Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains in the period included in net realized and unrealized (losses) gains (7)  
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 in the period included in net realized and unrealized (losses) gains 0 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 in the period included in net realized and unrealized (losses) gains 14 13
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 in the period included in net realized and unrealized (losses) gains 68 6
Net Investment Income Earned [Member] | Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains in the period included in net realized and unrealized (losses) gains 129 $ 19
Net Investment Income Earned [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains in the period included in net realized and unrealized (losses) gains 0  
Net Investment Income Earned [Member] | Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net (losses) gains in the period included in net realized and unrealized (losses) gains $ 47