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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Net unrealized gains (losses), before tax | $ (13,096) | $ (5,943) |
Net unrealized tax (expense) benefit | 3,503 | 1,608 |
Other comprehensive loss, net of tax | (9,593) | (4,335) |
Accumulated Other Comprehensive Loss [Member] |  |  |
Unrealized net gains (losses), net of tax | (9,877) |  | $ 409
Recognized gains (losses), net of tax | (284) |  | (1,140)
Other comprehensive loss, net of tax | (9,593) | (4,335) |
Investment securities- with OTTI [Member] |  |  |
Unrealized net gains (losses), before tax | 141 | 363 |
Recognized gains (losses), before tax | 50 | 50 |
Net unrealized gains (losses), before tax | 91 | 313 |
Unrealized tax (expense) benefit | (38) | (97) |
Net unrealized tax (expense) benefit | (25) | (84) |
Unrealized net gains (losses), net of tax | 103 | 266 | 2,475
Recognized gains (losses), net of tax | 37 |  | 147
Other comprehensive loss, net of tax | 66 | 229 |
Investment securities- with OTTI [Member] | Accretable Yield in Income [Member] |  |  |
Recognized gains (losses), before tax | 50 | 50 |
Recognized tax (expense) benefit | (13) | (13) |
Recognized gains (losses), net of tax | 37 | 37 |
Investment securities- all other [Member] |  |  |
Unrealized net gains (losses), before tax | (10,844) | (7,105) |
Recognized gains (losses), before tax | 3 |  |
Net unrealized gains (losses), before tax | (2,519) | (7,105) |
Unrealized tax (expense) benefit | 2,901 | 1,903 |
Net unrealized tax (expense) benefit | 674 | 1,903 |
Unrealized net gains (losses), net of tax | (7,943) | (5,202) |
Other comprehensive loss, net of tax | (1,845) | (5,202) |
Investment securities- all other [Member] | Recognition of Gains (Losses) In Income [Member] |  |  |
Recognized gains (losses), before tax | 3 |  |
Recognized tax (expense) benefit | (1) |  |
Recognized gains (losses), net of tax | 2 |  |
Investment Securities HTM [Member] |  |  |
Recognized gains (losses), before tax | (94) | (61) |
Net unrealized gains (losses), before tax | (8,234) | 61 |
Net unrealized tax (expense) benefit | 2,203 | (16) |
Unrealized net gains (losses), net of tax | (6,100) |  |
Recognized gains (losses), net of tax | (69) |  | (181)
Other comprehensive loss, net of tax | (6,031) | 45 |
Investment Securities HTM [Member] | Amortization of Recognized Income [Member] |  |  |
Recognized gains (losses), before tax | (94) | (61) |
Recognized tax (expense) benefit | 25 | 16 |
Recognized gains (losses), net of tax | (69) | (45) |
Investment Securities Transferred From AFS to HTM [Member] |  |  |
Unrealized net gains (losses), before tax | 8,328 |  |
Unrealized tax (expense) benefit | (2,228) |  |
Unrealized net gains (losses), net of tax | 6,100 |  |
Investment Securities Transferred to HTM [Member] |  |  |
Unrealized net gains (losses), before tax | (8,328) |  |
Unrealized tax (expense) benefit | 2,228 |  |
Unrealized net gains (losses), net of tax | (6,100) |  |
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |
Unrealized net gains (losses), before tax | 839 |  |
Net unrealized gains (losses), before tax |  | 532 |
Unrealized tax (expense) benefit | (225) |  |
Net unrealized tax (expense) benefit |  | (127) |
Unrealized net gains (losses), net of tax | 614 |  | 635
Other comprehensive loss, net of tax | 614 | 405 |
Pension Plan [Member] |  |  |
Unrealized net gains (losses), before tax | (3,620) | (190) |
Recognized gains (losses), before tax | (279) | (372) |
Net unrealized gains (losses), before tax | (3,341) | 182 |
Pension Plan [Member] | Pension [Member] |  |  |
Unrealized net gains (losses), before tax | (3,620) | (190) |
Net unrealized gains (losses), before tax | (3,341) | 182 |
Unrealized tax (expense) benefit | 969 | 51 |
Net unrealized tax (expense) benefit | 894 | (49) |
Unrealized net gains (losses), net of tax | (2,651) | (139) | 3,431
Recognized gains (losses), net of tax | (204) |  | (1,091)
Other comprehensive loss, net of tax | (2,447) | 133 |
Pension Plan [Member] | SERP [Member] |  |  |
Recognized gains (losses), before tax |  | 74 |
Net unrealized gains (losses), before tax | 68 |  |
Net unrealized tax (expense) benefit | (18) | (19) |
Unrealized net gains (losses), net of tax |  |  | (521)
Recognized gains (losses), net of tax | (50) |  | $ (128)
Other comprehensive loss, net of tax | 50 | 55 |
Pension Plan [Member] | Amortization of Unrecognized Loss [Member] | Pension [Member] |  |  |
Recognized gains (losses), before tax | (279) | (372) |
Recognized tax (expense) benefit | 75 | 100 |
Recognized gains (losses), net of tax | (204) | (272) |
Pension Plan [Member] | Amortization of Unrecognized Loss [Member] | SERP [Member] |  |  |
Recognized gains (losses), before tax | (68) | (75) |
Recognized tax (expense) benefit | 18 | 19 |
Recognized gains (losses), net of tax | $ (50) | (56) |
Pension Plan [Member] | Amortization of Prior Service Costs [Member] | SERP [Member] |  |  |
Recognized gains (losses), before tax |  | 1 |
Recognized gains (losses), net of tax |  | $ 1 |

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