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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, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Net unrealized gains (losses), before tax | $ (4,523) |  |  | $ (9,447) |  |  | $ (5,957) | $ (34,845) |
Income tax benefit/(expense) related to other comprehensive income | 1,060 |  |  | 2,529 |  |  | 1,410 | 9,325 |
Other comprehensive (loss)/income, net of tax | (3,463) | $ (1,153) | $ 69 | (6,918) | $ (9,009) | $ (9,593) | (4,547) | (25,520) |
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |  |  |
Unrealized net gains (losses), net of tax | (3,748) | (1,435) | (210) |  |  |  |  |  | $ (13,133)
Recognized gains (losses), net of tax | (285) | (282) | (279) |  |  |  |  |  | (1,421)
Other comprehensive (loss)/income, net of tax | (3,463) | (1,153) | 69 | (6,918) | $ (9,009) | $ (9,593) |  |  |
Investment securities- with OTTI [Member] |  |  |  |  |  |  |  |  |
Unrealized holding (losses)/gains on investments | 633 |  |  | (199) |  |  | (777) | (853) |
Recognized gains (losses), before tax | 51 |  |  | 51 |  |  | 152 | 152 |
Net unrealized gains (losses), before tax | 582 |  |  | (250) |  |  | (929) | (1,005) |
Unrealized tax (expense) benefit | (158) |  |  | 53 |  |  | 183 | 228 |
Income tax benefit/(expense) related to other comprehensive income | (145) |  |  | 67 |  |  | 220 | 269 |
Unrealized net gains (losses), net of tax | 475 | 111 | (1,180) | (146) |  |  | (594) | (625) | (614)
Recognized gains (losses), net of tax | 38 | 40 | 37 |  |  |  |  |  | 148
Other comprehensive (loss)/income, net of tax | 437 |  |  | (183) |  |  | (709) | (736) |
Investment securities- with OTTI [Member] | Accretable Yield in Income [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax | 51 |  |  | 51 |  |  | 152 | 152 |
Recognized tax (expense) benefit | (13) |  |  | (14) |  |  | (37) | (41) |
Recognized gains (losses), net of tax | 38 |  |  | 37 |  |  | 115 | 111 |
Investment securities- all other [Member] |  |  |  |  |  |  |  |  |
Unrealized holding (losses)/gains on investments |  |  |  | (6,768) |  |  | (5,065) | (22,971) |
Recognized gains (losses), before tax | (4,183) |  |  | (6,768) |  |  |  | 3 |
Net unrealized gains (losses), before tax | (4,183) |  |  | (6,768) |  |  | (5,065) | (14,646) |
Unrealized tax (expense) benefit |  |  |  | 1,811 |  |  |  | 6,147 |
Income tax benefit/(expense) related to other comprehensive income | 982 |  |  | 1,811 |  |  | 1,195 | 3,920 |
Unrealized net gains (losses), net of tax |  |  |  | (4,957) |  |  |  | (16,824) |
Other comprehensive (loss)/income, net of tax | (3,201) |  |  | (4,957) |  |  | (3,870) | (10,726) |
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 | (167) |  |  | (320) |  |  | (513) | (644) |
Net unrealized gains (losses), before tax | 167 |  |  | 227 |  |  | 513 | (7,777) |
Unrealized tax (expense) benefit |  |  |  |  |  |  |  | 2,228 |
Income tax benefit/(expense) related to other comprehensive income | (37) |  |  | (60) |  |  | (121) | 2,081 |
Unrealized net gains (losses), net of tax |  |  |  |  |  |  |  | (6,100) | (6,120)
Recognized gains (losses), net of tax | (130) | (129) | (133) |  |  |  |  |  | (551)
Other comprehensive (loss)/income, net of tax | 130 |  |  | 167 |  |  | 392 | (5,696) |
Investment Securities HTM [Member] | Recognition of Gains (Losses) In Income [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax |  |  |  | 93 |  |  |  | 93 |
Recognized tax (expense) benefit |  |  |  | (25) |  |  |  | (25) |
Recognized gains (losses), net of tax |  |  |  | 68 |  |  |  | 68 |
Investment Securities HTM [Member] | Amortization of Recognized Income [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax | (167) |  |  | (320) |  |  | (513) | (644) |
Recognized tax (expense) benefit | 37 |  |  | 85 |  |  | 121 | 172 |
Recognized gains (losses), net of tax | (130) |  |  | (235) |  |  | (392) | (472) |
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] |  |  |  |  |  |  |  |  |
Net unrealized gains (losses), before tax | 14 |  |  | 534 |  |  | 30 | 1,622 |
Income tax benefit/(expense) related to other comprehensive income | (3) |  |  | (142) |  |  | (7) | (434) |
Unrealized net gains (losses), net of tax | 11 | 150 | (138) |  |  |  |  |  | 1,116
Other comprehensive (loss)/income, net of tax | 11 |  |  | 392 |  |  | 23 | 1,188 |
Adjustment [Member] |  |  |  |  |  |  |  |  |
Unrealized holding (losses)/gains on investments | (1,352) |  |  | (3,537) |  |  | (1,250) | (14,079) |
Recognized gains (losses), before tax | (251) |  |  | (279) |  |  | (750) | (837) |
Net unrealized gains (losses), before tax | (1,101) |  |  | (3,258) |  |  | (500) | (13,242) |
Adjustment [Member] | Pension [Member] |  |  |  |  |  |  |  |  |
Unrealized holding (losses)/gains on investments | (1,352) |  |  | (3,537) |  |  | (1,250) | (14,079) |
Net unrealized gains (losses), before tax | (1,101) |  |  | (3,258) |  |  | (500) | (13,242) |
Unrealized tax (expense) benefit | 319 |  |  | 945 |  |  | 298 | 3,767 |
Income tax benefit/(expense) related to other comprehensive income | 262 |  |  | 871 |  |  | 121 | 3,543 |
Unrealized net gains (losses), net of tax | (1,033) | (42) | 123 | (2,592) |  |  | (952) | (10,312) | 684
Recognized gains (losses), net of tax | (194) | (195) | (184) |  |  |  |  |  | (821)
Other comprehensive (loss)/income, net of tax | (839) |  |  | (2,387) |  |  | (379) | (9,699) |
Adjustment [Member] | SERP [Member] |  |  |  |  |  |  |  |  |
Net unrealized gains (losses), before tax | (2) |  |  | 68 |  |  | (6) | 203 |
Income tax benefit/(expense) related to other comprehensive income | 1 |  |  | (18) |  |  | 2 | (54) |
Unrealized net gains (losses), net of tax |  |  |  |  |  |  |  |  | 2,430
Recognized gains (losses), net of tax | 1 | $ 2 | $ 1 |  |  |  |  |  | $ (199)
Other comprehensive (loss)/income, net of tax | (1) |  |  | 50 |  |  | (4) | 149 |
Adjustment [Member] | Amortization of Unrecognized Loss [Member] | Pension [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax | (251) |  |  | (279) |  |  | (750) | (837) |
Recognized tax (expense) benefit | 57 |  |  | 74 |  |  | 177 | 224 |
Recognized gains (losses), net of tax | (194) |  |  | (205) |  |  | (573) | (613) |
Adjustment [Member] | Amortization of Unrecognized Loss [Member] | SERP [Member] |  |  |  |  |  |  |  |  |
Recognized gains (losses), before tax | 2 |  |  | (68) |  |  | 6 | (203) |
Recognized tax (expense) benefit | (1) |  |  | 18 |  |  | (2) | 54 |
Recognized gains (losses), net of tax | $ 1 |  |  | $ (50) |  |  | $ 4 | $ (149) |

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