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Accumulated Other Comprehensive Income (Loss) (Changes in AOCI by component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance $ (36,417) $ (24,840) $ (37,194) $ 1,859
OCI before reclassifications 6,708 22,815 5,736 56,413
Amounts reclassified from AOCI 0 0 67 0
Other Comprehensive Income (Loss), before Tax (6,708) (22,815) (5,803) (56,413)
Tax effect 1,394 4,788 1,266 11,687
Unrealized gains (losses), net of tax (5,314) (18,027) (4,537) (44,726)
Ending Balance (41,731) (42,867) (41,731) (42,867)
Unrealized Holding Gains (Losses) on AFS Securities [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (35,051) (22,826) (35,828) 3,873
OCI before reclassifications 6,708 22,815 5,736 56,413
Amounts reclassified from AOCI 0 0 67 0
Other Comprehensive Income (Loss), before Tax (6,708) (22,815) (5,803) (56,413)
Tax effect 1,394 4,788 1,266 11,687
Unrealized gains (losses), net of tax (5,314) (18,027) (4,537) (44,726)
Ending Balance (40,365) (40,853) (40,365) (40,853)
Defined Benefit Pension Plan [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (1,366) (2,014) (1,366) (2,014)
OCI before reclassifications 0 0 0 0
Amounts reclassified from AOCI 0 0 0 0
Other Comprehensive Income (Loss), before Tax 0 0 0 0
Tax effect 0 0 0 0
Unrealized gains (losses), net of tax 0 0 0 0
Ending Balance (1,366) (2,014) (1,366) (2,014)
Auction Rate Money Market Preferred Stocks [Member] | Unrealized Holding Gains (Losses) on AFS Securities [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Unrealized gains (losses), net of tax $ (67) $ (18) $ 228 $ (763)