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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (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 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Net unrealized gains (losses), before tax | $ (361) |  |  | $ 2,221 |  |  | $ 179 | $ 156 |
Net unrealized tax (expense) benefit | 97 |  |  | (589) |  |  | (48) | (36) |
Other comprehensive (loss)/income, net of tax | (264) | $ 4,730 | $ (4,335) | 1,632 | $ 4,120 | $ (5,632) | 131 | 120 |
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |  |  |
Unrealized net gains (losses), net of tax | (586) | 4,519 | (4,670) |  |  |  |  |  | $ (4,052)
Recognized gains (losses), net of tax | (322) | (211) | (335) |  |  |  |  |  | (1,160)
Other comprehensive (loss)/income, net of tax | (264) | 4,730 | (4,335) | 1,632 | $ 4,120 | $ (5,632) |  |  |
Investment securities- with OTTI [Member] |  |  |  |  |  |  |  |  |
Unrealized net gains (losses), before tax | 751 |  |  | 708 |  |  | 3,274 | (1,249) |
Net unrealized gains (losses), before tax | 701 |  |  | 658 |  |  | 3,123 | (1,400) |
Unrealized tax (expense) benefit | (201) |  |  | (190) |  |  | (877) | 335 |
Net unrealized tax (expense) benefit | (188) |  |  | (177) |  |  | (837) | 375 |
Unrealized net gains (losses), net of tax | 550 | 1,581 | 266 | 518 |  |  | 2,397 | (914) | (587)
Recognized gains (losses), net of tax | 37 | 37 | 37 |  |  |  |  |  | 148
Other comprehensive (loss)/income, net of tax | 513 |  |  | 481 |  |  | 2,286 | (1,025) |
Investment securities- with OTTI [Member] | Accretable Yield in Income [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax | 50 |  |  | 50 |  |  | 151 | 151 |
Recognized tax (expense) benefit | (13) |  |  | (13) |  |  | (40) | (40) |
Recognized gains (losses), net of tax | 37 |  |  | 37 |  |  | 111 | 111 |
Investment securities- all other [Member] |  |  |  |  |  |  |  |  |
Unrealized net gains (losses), before tax | (708) |  |  | (321) |  |  | (5,035) | 2,446 |
Net unrealized gains (losses), before tax | (708) |  |  | (896) |  |  | (5,189) | 1,824 |
Unrealized tax (expense) benefit | 190 |  |  | 86 |  |  | 1,349 | (655) |
Net unrealized tax (expense) benefit | 190 |  |  | 240 |  |  | 1,390 | (488) |
Unrealized net gains (losses), net of tax | (518) | 2,034 | (5,202) | (235) |  |  | (3,686) | 1,791 | 1,291
Recognized gains (losses), net of tax |  | 113 |  |  |  |  |  |  | 463
Other comprehensive (loss)/income, net of tax | (518) |  |  | (656) |  |  | (3,799) | 1,336 |
Investment securities- all other [Member] | Recognition of Gains (Losses) In Income [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax |  |  |  | 575 |  |  | 154 | 622 |
Recognized tax (expense) benefit |  |  |  | (154) |  |  | (41) | (167) |
Recognized gains (losses), net of tax |  |  |  | 421 |  |  | 113 | 455 |
Investment securities HTM [Member] |  |  |  |  |  |  |  |  |
Net unrealized gains (losses), before tax | 42 |  |  | 74 |  |  | 150 | 749 |
Net unrealized tax (expense) benefit | (11) |  |  | (20) |  |  | (40) | (201) |
Recognized gains (losses), net of tax | (31) | (34) | (45) |  |  |  |  |  | (584)
Other comprehensive (loss)/income, net of tax | 31 |  |  | 54 |  |  | 110 | 548 |
Investment securities HTM [Member] | Recognition of Gains (Losses) In Income [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax | (54) |  |  |  |  |  | (54) | 60 |
Recognized tax (expense) benefit | 14 |  |  |  |  |  | 14 | (16) |
Recognized gains (losses), net of tax | (40) |  |  |  |  |  | (40) | 44 |
Investment securities HTM [Member] | Amortization of Recognized Income [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax | 12 |  |  | (74) |  |  | (96) | (809) |
Recognized tax (expense) benefit | (3) |  |  | 20 |  |  | 26 | 217 |
Recognized gains (losses), net of tax | 9 |  |  | (54) |  |  | (70) | (592) |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |  |  |  |  |
Unrealized net gains (losses), before tax |  |  |  |  |  |  | 615 |  |
Net unrealized gains (losses), before tax | 108 |  |  | 90 |  |  |  | (1,335) |
Unrealized tax (expense) benefit |  |  |  |  |  |  | (165) |  |
Net unrealized tax (expense) benefit | (29) |  |  | (18) |  |  |  | 363 |
Unrealized net gains (losses), net of tax | 79 | (34) | 405 |  |  |  |  |  | (869)
Other comprehensive (loss)/income, net of tax | 79 |  |  | 72 |  |  | 450 | (972) |
Defined Benefit Plans Adjustments [Member] | Pension [Member] |  |  |  |  |  |  |  |  |
Unrealized net gains (losses), before tax | (951) |  |  | 1,891 |  |  | 139 | (895) |
Net unrealized gains (losses), before tax | (579) |  |  | 2,249 |  |  | 1,255 | 179 |
Unrealized tax (expense) benefit | 254 |  |  | (506) |  |  | (37) | 240 |
Net unrealized tax (expense) benefit | 155 |  |  | (602) |  |  | (336) | (48) |
Unrealized net gains (losses), net of tax | (697) | 938 | (139) | 1,385 |  |  | 102 | (655) | (3,262)
Recognized gains (losses), net of tax | (273) | (272) | (272) |  |  |  |  |  | (1,049)
Other comprehensive (loss)/income, net of tax | (424) |  |  | 1,647 |  |  | 919 | 131 |
Defined Benefit Plans Adjustments [Member] | SERP [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax |  |  |  |  |  |  |  | 139 |
Net unrealized gains (losses), before tax | 75 |  |  | 46 |  |  | 225 |  |
Net unrealized tax (expense) benefit | (20) |  |  | (12) |  |  | (60) | (37) |
Unrealized net gains (losses), net of tax |  |  |  |  |  |  |  |  | (625)
Recognized gains (losses), net of tax | (55) | $ (55) | $ (55) |  |  |  |  |  | $ (138)
Other comprehensive (loss)/income, net of tax | 55 |  |  | 34 |  |  | 165 | 102 |
Defined Benefit Plans Adjustments [Member] | Amortization of Unrecognized Loss [Member] | Pension [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax | (372) |  |  | (358) |  |  | (1,116) | (1,074) |
Recognized tax (expense) benefit | 99 |  |  | 96 |  |  | 299 | 288 |
Recognized gains (losses), net of tax | (273) |  |  | (262) |  |  | (817) | (786) |
Defined Benefit Plans Adjustments [Member] | Amortization of Unrecognized Loss [Member] | SERP [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax | (76) |  |  | (47) |  |  | (226) | (141) |
Recognized tax (expense) benefit | 20 |  |  | 13 |  |  | 60 | 38 |
Recognized gains (losses), net of tax | $ (56) |  |  | (34) |  |  | (166) | (103) |
Defined Benefit Plans Adjustments [Member] | Amortization of Prior Service Costs [Member] | SERP [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax |  |  |  | 1 |  |  | 1 | 2 |
Recognized tax (expense) benefit |  |  |  | $ (1) |  |  |  | (1) |
Recognized gains (losses), net of tax |  |  |  |  |  |  | $ 1 | $ 1 |

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