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Accumulated Other Comprehensive Income (Loss) (Changes in AOCI by component) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ (37,194) $ 1,859
OCI before reclassifications (8,610) 22,928
Amounts reclassified from AOCI 1 0
Other Comprehensive Income (Loss), before Tax 8,609 (22,928)
Tax effect (1,729) 4,736
Unrealized gains (losses), net of tax 6,880 (18,192)
Ending Balance (30,314) (16,333)
Unrealized Holding Gains (Losses) on AFS Securities [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (35,828) 3,873
OCI before reclassifications (8,610) 22,928
Amounts reclassified from AOCI 1 0
Other Comprehensive Income (Loss), before Tax 8,609 (22,928)
Tax effect (1,729) 4,736
Unrealized gains (losses), net of tax 6,880 (18,192)
Ending Balance (28,948) (14,319)
Defined Benefit Pension Plan [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (1,366) (2,014)
OCI before reclassifications 0 0
Amounts reclassified from AOCI 0 0
Other Comprehensive Income (Loss), before Tax 0 0
Tax effect 0 0
Unrealized gains (losses), net of tax 0 0
Ending Balance (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 $ 374 $ (375)