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Fair Value Measurements (Changes in Fair Value of Securities Using Level 3 Inputs) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 $ 6,661 $ 7,745
Total net gains (losses) for the period included in OCI 152 (343)
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, March 31 6,874 7,245
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 61 (157)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 152 (343)
Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 187,980 114,127
Total net gains (losses) for the period included in OCI 2,405 (6,529)
Purchases 24,799 2,964
Sales 0 0
Issuances 0 0
Settlements (4,044) (69)
Transfers into Level 3 361 17,055
Transfers out of Level 3 0 (2,941)
Fair value, March 31 211,585 122,802
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 72 (1,809)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 2,405 (6,529)
Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 153,342 124,909
Total net gains (losses) for the period included in OCI 696 (4,335)
Purchases 13,403 27,033
Sales 0 0
Issuances 0 0
Settlements (1,192) (136)
Transfers into Level 3 14,148 0
Transfers out of Level 3 (534) (16,096)
Fair value, March 31 179,758 130,918
Change in unrealized gains (losses) for the period included in earnings for assets held at period end (73) (472)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 696 (4,335)
Residential Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31   245
Total net gains (losses) 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
Change in unrealized gains (losses) for the period included in earnings for assets held at period end   0
Change in unrealized gains (losses) 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 31 375 4,256
Total net gains (losses) for the period included in OCI 17 (415)
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (3) (11)
Transfers into Level 3 2,848 0
Transfers out of Level 3 0 (3,431)
Fair value, March 31 3,236 439
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 0 (7)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 17 (415)
Common Stock [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 897  
Total net gains (losses) for the period included in OCI 0  
Purchases 0  
Sales 0  
Issuances 0  
Settlements 0  
Transfers into Level 3 0  
Transfers out of Level 3 0  
Fair value, March 31 628  
Change in unrealized gains (losses) for the period included in earnings for assets held at period end (269)  
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 0  
Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 349,255 251,282
Total net gains (losses) for the period included in OCI 3,270 (11,639)
Purchases 38,202 29,997
Sales 0 0
Issuances 0 0
Settlements (5,239) (227)
Transfers into Level 3 17,357 17,055
Transfers out of Level 3 (534) (22,685)
Fair value, March 31 402,081 261,404
Change in unrealized gains (losses) for the period included in earnings for assets held at period end (209) (2,445)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 3,270 (11,639)
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 gains (losses) in the period included in net income 61 (157)
Gain (Loss) on Investments [Member] | Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) in the period included in net income 72 (1,809)
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 gains (losses) in the period included in net income (73) (472)
Gain (Loss) on Investments [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) in the period included in net income   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 gains (losses) in the period included in net income 0 (7)
Gain (Loss) on Investments [Member] | Common Stock [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) in the period included in net income (269)  
Gain (Loss) on Investments [Member] | Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) in the period included in net income (209) (2,445)
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 gains (losses) in the period included in net income 0 0
Net Investment Income Earned [Member] | Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) in the period included in net income 12 4
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 gains (losses) in the period included in net income (32) 15
Net Investment Income Earned [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) in the period included in net income   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 gains (losses) in the period included in net income (1) 47
Net Investment Income Earned [Member] | Common Stock [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) in the period included in net income 0  
Net Investment Income Earned [Member] | Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) in the period included in net income $ (21) $ 66