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Accumulated Other Comprehensive Loss (Components of Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Net unrealized gains (losses), before tax | $ 93 | $ (13,096) |
Income tax benefit/(expense) related to other comprehensive income | (24) | 3,503 |
Other comprehensive (loss)/income, net of tax | 69 | (9,593) |
Accumulated Other Comprehensive Loss [Member] |  |  |
Unrealized net gains (losses), net of tax | (210) |  | $ (13,133)
Recognized gains (losses), net of tax | (279) |  | (1,421)
Other comprehensive (loss)/income, net of tax | 69 | (9,593) |
Investment securities- with OTTI [Member] |  |  |
Unrealized holding (losses)/gains on investments | (1,606) | 141 |
Recognized gains (losses), before tax | 50 | 50 |
Net unrealized gains (losses), before tax | (1,656) | 91 |
Unrealized tax (expense) benefit | 426 | (38) |
Income tax benefit/(expense) related to other comprehensive income | 439 | (25) |
Unrealized net gains (losses), net of tax | (1,180) | 103 | (614)
Recognized gains (losses), net of tax | 37 |  | 148
Other comprehensive (loss)/income, net of tax | (1,217) | 66 |
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 holding (losses)/gains on investments | 1,340 | (10,844) |
Recognized gains (losses), before tax |  | 3 |
Net unrealized gains (losses), before tax | 1,340 | (2,519) |
Unrealized tax (expense) benefit | (355) | 2,901 |
Income tax benefit/(expense) related to other comprehensive income |  | 674 |
Unrealized net gains (losses), net of tax | 985 | (7,943) |
Other comprehensive (loss)/income, net of tax |  | (1,845) |
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] |  |  |
Unrealized holding (losses)/gains on investments |  | (8,328) |
Recognized gains (losses), before tax | (181) | (94) |
Net unrealized gains (losses), before tax | 181 | (8,234) |
Unrealized tax (expense) benefit |  | 2,228 |
Income tax benefit/(expense) related to other comprehensive income | (48) | 2,203 |
Unrealized net gains (losses), net of tax |  | (6,100) | (6,120)
Recognized gains (losses), net of tax | (133) |  | (551)
Other comprehensive (loss)/income, net of tax | 133 | (6,031) |
Investment Securities HTM [Member] | Amortization of Recognized Income [Member] |  |  |
Recognized gains (losses), before tax | (181) | (94) |
Recognized tax (expense) benefit | 48 | 25 |
Recognized gains (losses), net of tax | (133) | (69) |
Investment Securities Transferred From AFS to HTM |  |  |
Unrealized holding (losses)/gains on investments |  | 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 holding (losses)/gains on investments | (188) |  |
Net unrealized gains (losses), before tax |  | 839 |
Unrealized tax (expense) benefit | 50 |  |
Income tax benefit/(expense) related to other comprehensive income |  | (225) |
Unrealized net gains (losses), net of tax | (138) |  | 1,116
Other comprehensive (loss)/income, net of tax | (138) | 614 |
Adjustment [Member] |  |  |
Unrealized holding (losses)/gains on investments | 168 | (3,620) |
Recognized gains (losses), before tax | (250) | (279) |
Net unrealized gains (losses), before tax | 418 | (3,341) |
Adjustment [Member] | Pension [Member] |  |  |
Unrealized holding (losses)/gains on investments | 168 | (3,620) |
Net unrealized gains (losses), before tax | 418 | (3,341) |
Unrealized tax (expense) benefit | (45) | 969 |
Income tax benefit/(expense) related to other comprehensive income | (111) | 894 |
Unrealized net gains (losses), net of tax | 123 | (2,651) | 684
Recognized gains (losses), net of tax | (184) |  | (821)
Other comprehensive (loss)/income, net of tax | 307 | (2,447) |
Adjustment [Member] | SERP [Member] |  |  |
Unrealized holding (losses)/gains on investments |  |  |
Net unrealized gains (losses), before tax | (2) | 68 |
Unrealized tax (expense) benefit |  |  |
Income tax benefit/(expense) related to other comprehensive income | 1 | (18) |
Unrealized net gains (losses), net of tax |  |  | 2,430
Recognized gains (losses), net of tax | 1 |  | $ (199)
Other comprehensive (loss)/income, net of tax | (1) | 50 |
Adjustment [Member] | Amortization of Unrecognized Loss [Member] | Pension [Member] |  |  |
Recognized gains (losses), before tax | (250) | (279) |
Recognized tax (expense) benefit | 66 | 75 |
Recognized gains (losses), net of tax | (184) | (204) |
Adjustment [Member] | Amortization of Unrecognized Loss [Member] | SERP [Member] |  |  |
Recognized gains (losses), before tax | 2 | (68) |
Recognized tax (expense) benefit | (1) | 18 |
Recognized gains (losses), net of tax | $ 1 | $ (50) |

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