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Accumulated Other Comprehensive Income (Loss) (Changes in AOCI by component) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ 1,859 $ 7,698
OCI before reclassifications 22,928 3,519
Tax effect 4,736 737
Unrealized gains (losses), net of tax (18,192) (2,782)
Ending Balance (16,333) 4,916
Unrealized Holding Gains (Losses) on AFS Securities [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 3,873 10,485
OCI before reclassifications 22,928 3,545
Tax effect 4,736 742
Unrealized gains (losses), net of tax (18,192) (2,803)
Ending Balance (14,319) 7,682
Defined Benefit Pension Plan [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (2,014) (2,745)
OCI before reclassifications 0 0
Tax effect 0 0
Unrealized gains (losses), net of tax 0 0
Ending Balance (2,014) (2,745)
Gain (Loss) on Derivative Instruments [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 0 (42)
OCI before reclassifications 0 (26)
Tax effect 0 (5)
Unrealized gains (losses), net of tax 0 21
Ending Balance 0 (21)
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 $ (375) $ (13)