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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance $ 5,724 $ 8,367 $ 7,698 $ 1,971
OCI before reclassifications 1,690 46 4,194 (8,159)
Amounts reclassified from AOCI     0 (71)
Other Comprehensive Income (Loss), before Tax     (4,194) 8,088
Tax effect 353 54 883 (1,684)
Unrealized gains (losses), net of tax (1,337) 8 (3,311) 6,404
Ending Balance 4,387 8,375 4,387 8,375
Unrealized Holding Gains (Losses) on AFS Securities [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance 8,469 11,139 10,485 4,612
OCI before reclassifications 1,690 66 4,247 (8,304)
Amounts reclassified from AOCI     0 (71)
Other Comprehensive Income (Loss), before Tax     (4,247) 8,233
Tax effect 353 58 894 (1,714)
Unrealized gains (losses), net of tax (1,337) (8) (3,353) 6,519
Ending Balance 7,132 11,131 7,132 11,131
Defined Benefit Pension Plan [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (2,745) (2,695) (2,745) (2,695)
OCI before reclassifications 0 0 0 0
Amounts reclassified from AOCI     0 0
Other Comprehensive Income (Loss), before Tax     0 0
Tax effect 0 0 0
Unrealized gains (losses), net of tax 0 0 0 0
Ending Balance (2,745) (2,695) (2,745) (2,695)
Gain (Loss) on Derivative Instruments [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance 0 (77) (42) 54
OCI before reclassifications 0 (20) (53) 145
Amounts reclassified from AOCI     0 0
Other Comprehensive Income (Loss), before Tax     53 (145)
Tax effect 0 (4) (11) 30
Unrealized gains (losses), net of tax 0 16 42 (115)
Ending Balance 0 (61) 0 (61)
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 $ (14) $ 215 $ 9 $ 75