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Shareholders' Equity (Roll Forward of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 1,111,980 $ 1,104,018
OCI, before reclassifications, net of tax (2,720) 40,007
Amounts reclassified from AOCI, net of tax 248 2,622
Net OCI, current period (2,472) 42,629
Ending balance 1,113,065 1,138,290
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (204,489) (298,607)
Ending balance (206,961) (255,978)
Unrealized Investment Gains (Losses)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (206,327) (297,142)
OCI, before reclassifications, net of tax (6,339) 40,007
Amounts reclassified from AOCI, net of tax 1,321 2,622
Net OCI, current period (5,018) 42,629
Ending balance (211,345) (254,513)
Cash Flow Hedging Gains (Losses)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 3,026  
OCI, before reclassifications, net of tax 4,074  
Amounts reclassified from AOCI, net of tax (1,073)  
Net OCI, current period 3,001  
Ending balance 6,027  
Non-credit Impairments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (11) (11)
OCI, before reclassifications, net of tax (455) 0
Amounts reclassified from AOCI, net of tax 0 0
Net OCI, current period (455) 0
Ending balance (466) (11)
Unrecognized Change in Defined Benefit Plan Liabilities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (1,177) (1,454)
OCI, before reclassifications, net of tax 0 0
Amounts reclassified from AOCI, net of tax 0 0
Net OCI, current period 0 0
Ending balance $ (1,177) $ (1,454)