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Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Balance | $ 130,556 | $ 129,189 | $ 131,047 | $ 124,453 | $ 131,047 | $ 125,940 | $ 125,940
Balance | 133,787 | 130,556 | 129,189 | 130,237 | 133,787 | 130,237 | 131,047
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |
Balance | (28,468) | (33,198) | (28,863) | (27,483) | (28,863) | (25,971) | (25,971)
Other comprehensive income/(loss) before reclassifications | (586) | 4,519 | (4,670) |  |  |  | (4,052)
Amounts reclassified from accumulated other comprehensive loss | 322 | 211 | 335 |  |  |  | 1,160
Balance | (28,732) | (28,468) | (33,198) | (25,851) | (28,732) | (25,851) | (28,863)
Investment securities- with OTTI [Member] |  |  |  |  |  |  |
Balance | (1,504) | (3,048) | (3,277) |  | (3,277) | (2,542) | (2,542)
Other comprehensive income/(loss) before reclassifications | 550 | 1,581 | 266 | 518 | 2,397 | (914) | (587)
Amounts reclassified from accumulated other comprehensive loss | (37) | (37) | (37) |  |  |  | (148)
Balance | (991) | (1,504) | (3,048) |  | (991) |  | (3,277)
Investment securities- all other [Member] |  |  |  |  |  |  |
Balance | (3,306) | (5,227) | (25) |  | (25) | (853) | (853)
Other comprehensive income/(loss) before reclassifications | (518) | 2,034 | (5,202) | (235) | (3,686) | 1,791 | 1,291
Amounts reclassified from accumulated other comprehensive loss |  | (113) |  |  |  |  | (463)
Balance | (3,824) | (3,306) | (5,227) |  | (3,824) |  | (25)
Investment securities HTM [Member] |  |  |  |  |  |  |
Balance | (236) | (270) | (315) |  | (315) | (899) | (899)
Amounts reclassified from accumulated other comprehensive loss | 31 | 34 | 45 |  |  |  | 584
Balance | (205) | (236) | (270) |  | (205) |  | (315)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |  |  |
Balance | (583) | (549) | (954) |  | (954) | (85) | (85)
Other comprehensive income/(loss) before reclassifications | 79 | (34) | 405 |  |  |  | (869)
Balance | (504) | (583) | (549) |  | (504) |  | (954)
Defined Benefit Plans Adjustments [Member] | Pension [Member] |  |  |  |  |  |  |
Balance | (21,287) | (22,497) | (22,630) |  | (22,630) | (20,417) | (20,417)
Other comprehensive income/(loss) before reclassifications | (697) | 938 | (139) | $ 1,385 | 102 | (655) | (3,262)
Amounts reclassified from accumulated other comprehensive loss | 273 | 272 | 272 |  |  |  | 1,049
Balance | (21,711) | (21,287) | (22,497) |  | (21,711) |  | (22,630)
Defined Benefit Plans Adjustments [Member] | SERP [Member] |  |  |  |  |  |  |
Balance | (1,552) | (1,607) | (1,662) |  | (1,662) | $ (1,175) | (1,175)
Other comprehensive income/(loss) before reclassifications |  |  |  |  |  |  | (625)
Amounts reclassified from accumulated other comprehensive loss | 55 | 55 | 55 |  |  |  | 138
Balance | $ (1,497) | $ (1,552) | $ (1,607) |  | $ (1,497) |  | $ (1,662)

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