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Fair Value Measurements (Change in Fair Value of Securities Using Level 3 Inputs) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Obligations of States and Political Subdivisions [Member] | Available-for-sale Securities [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 (343) (99)  
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, March 31 7,245 7,896  
Period change unrealized losses in earnings for assets held at period end (157) 0  
Period change unrealized gains in OCI for assets held at period end $ (343) (99)  
Corporate Securities [Member] | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Credit Spread      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt Securities, Available-for-sale, Measurement Input (0.044)   0.003
Corporate Securities [Member] | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Credit Spread      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt Securities, Available-for-sale, Measurement Input 0.053   0.030
Corporate Securities [Member] | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Credit Spread      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt Securities, Available-for-sale, Measurement Input (0.011)   (0.012)
Corporate Securities [Member] | Available-for-sale 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 (6,529) (2,388)  
Purchases 2,964 21,100  
Sales 0 0  
Issuances 0 0  
Settlements (69) 0  
Transfers into Level 3 17,055 0  
Transfers out of Level 3 (2,941) 0  
Fair value, March 31 122,802 89,322  
Period change unrealized losses in earnings for assets held at period end (1,809) (91)  
Period change unrealized gains in OCI for assets held at period end (6,529) (2,388)  
Corporate Securities [Member] | Available-for-sale Securities [Member] | Valuation Technique, Discounted Cash Flow      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total assets measured at fair value $ 56,510   $ 54,135
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Credit Spread      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt Securities, Available-for-sale, Measurement Input 0.0001   0.007
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Credit Spread      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt Securities, Available-for-sale, Measurement Input 0.080   0.080
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Credit Spread      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt Securities, Available-for-sale, Measurement Input (0.019)   (0.021)
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Available-for-sale 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 (4,335) (1,116)  
Purchases 27,033 10,672  
Sales 0 0  
Issuances 0 0  
Settlements (136) (412)  
Transfers into Level 3 0 0  
Transfers out of Level 3 (16,096) (490)  
Fair value, March 31 130,918 64,889  
Period change unrealized losses in earnings for assets held at period end (472) (143)  
Period change unrealized gains in OCI for assets held at period end (4,335) (1,116)  
Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Available-for-sale Securities [Member] | Valuation Technique, Discounted Cash Flow      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total assets measured at fair value 46,816   $ 34,903
Investments [Member] | Available-for-sale Securities [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 (11,639) (3,603)  
Purchases 29,997 31,772  
Sales 0 0  
Issuances 0 0  
Settlements (227) (412)  
Transfers into Level 3 17,055 5,101  
Transfers out of Level 3 (22,685) (490)  
Fair value, March 31 261,404 162,107  
Period change unrealized losses in earnings for assets held at period end (2,445) (234)  
Period change unrealized gains in OCI for assets held at period end (11,639) (3,603)  
Other Assets, Fair Value Disclosure 158,078   162,244
Investments [Member] | Available-for-sale Securities [Member] | Valuation Technique, Discounted Cash Flow      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total assets measured at fair value 103,326   $ 89,038
Residential Mortgage Backed Securities [Member] | Available-for-sale 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, March 31 0    
Period change unrealized losses in earnings for assets held at period end 0    
Period change unrealized gains in OCI for assets held at period end (17)    
Commercial Mortgage Backed Securities [Member] | Available-for-sale 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 (415)    
Purchases 0    
Sales 0    
Issuances 0    
Settlements (11)    
Transfers into Level 3 0    
Transfers out of Level 3 (3,431)    
Fair value, March 31 439    
Period change unrealized losses in earnings for assets held at period end (7)    
Period change unrealized gains in OCI for assets held at period end (415)    
Gain (Loss) on Investments [Member] | Obligations of States and Political Subdivisions [Member] | Available-for-sale 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 (157) 0  
Gain (Loss) on Investments [Member] | Corporate Securities [Member] | Available-for-sale 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 (1,809) (91)  
Gain (Loss) on Investments [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Available-for-sale 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 (472) (143)  
Gain (Loss) on Investments [Member] | Investments [Member] | Available-for-sale 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 (2,445) (234)  
Gain (Loss) on Investments [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale 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    
Gain (Loss) on Investments [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale 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 (7)    
Net Investment Income Earned [Member] | Obligations of States and Political Subdivisions [Member] | Available-for-sale 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] | Corporate Securities [Member] | Available-for-sale 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 4 1  
Net Investment Income Earned [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member] | Available-for-sale 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 15 3  
Net Investment Income Earned [Member] | Investments [Member] | Available-for-sale 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 66 $ 4  
Net Investment Income Earned [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale 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    
Net Investment Income Earned [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale 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 $ 47