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Accumulated Other Comprehensive Income (Loss) (Changes in AOCI by component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance $ 4,916 $ 6,710 $ 7,698 $ 1,971
OCI before reclassifications (1,015) (2,030) 2,504 (8,205)
Amounts reclassified from AOCI     0 (71)
Other Comprehensive Income (Loss), before Tax     (2,504) 8,134
Tax effect (207) (373) 530 (1,738)
Unrealized gains (losses), net of tax 808 1,657 (1,974) 6,396
Ending Balance 5,724 8,367 5,724 8,367
Unrealized Holding Gains (Losses) on AFS Securities [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance 7,682 9,459 10,485 4,612
OCI before reclassifications (988) (2,059) 2,557 (8,370)
Amounts reclassified from AOCI     0 (71)
Other Comprehensive Income (Loss), before Tax     (2,557) 8,299
Tax effect (201) (379) 541 (1,772)
Unrealized gains (losses), net of tax 787 1,680 (2,016) 6,527
Ending Balance 8,469 11,139 8,469 11,139
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 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 (21) (54) (42) 54
OCI before reclassifications (27) 29 (53) 165
Amounts reclassified from AOCI     0 0
Other Comprehensive Income (Loss), before Tax     53 (165)
Tax effect (6) 6 (11) 34
Unrealized gains (losses), net of tax 21 (23) 42 (131)
Ending Balance 0 (77) 0 (77)
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 $ 36 $ 253 $ 23 $ (140)