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Accumulated Other Comprehensive Income - AOCI Components Pre Post & Tax Effect (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Net Unrealized Gains Arising During the Period, net | $ 14,646 | $ 4,427 | $ 35,221 | $ 12,807
Reclassification from AOCI, net | 4,557 | 4,793 | 8,974 | 9,520
Other Comprehensive Income, before tax | 26,128 | 12,546 | 60,130 | 30,382
Other Comprehensive Income, tax | 6,925 | 3,326 | 15,935 | 8,055
Other Comprehensive Income | 19,203 | 9,220 | 44,195 | 22,327
Net Unrealized Gains on Investment Securities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other Comprehensive Income, before tax | 25,811 | 12,316 | 59,498 | 29,922
Other Comprehensive Income, tax | 6,841 | 3,264 | 15,768 | 7,932
Other Comprehensive Income | 18,970 | 9,052 | 43,730 | 21,990
Investment Securities-Available-for-Sale |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Net Unrealized Gains Arising During the Period, before tax | 19,927 | 6,022 | 47,920 | 17,426
Net Unrealized Gains Arising During the Period, tax | 5,281 | 1,595 | 12,699 | 4,619
Net Unrealized Gains Arising During the Period, net | 14,646 | 4,427 | 35,221 | 12,807
Reclassification from AOCI, net | 0 | 0 | 0 | 0
Other Comprehensive Income | 14,646 | 4,427 | 35,221 | 12,807
Investment Securities-Held-to-Maturity |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Net Unrealized Gains Arising During the Period, net | 0 | 0 | 0 | 0
Reclassification from AOCI | 5,884 | 6,294 | 11,578 | 12,496
Reclassification from AOCI, tax | 1,560 | 1,669 | 3,069 | 3,313
Reclassification from AOCI, net | 4,324 | 4,625 | 8,509 | 9,183
Other Comprehensive Income | 4,324 | 4,625 | 8,509 | 9,183
Defined Benefit Plans, Net |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Net Unrealized Gains Arising During the Period, net | 0 | 0 | 0 | 0
Reclassification from AOCI, net | 233 | 168 | 465 | 337
Other Comprehensive Income, before tax | 317 | 230 | 632 | 460
Other Comprehensive Income, tax | 84 | 62 | 167 | 123
Other Comprehensive Income | 233 | 168 | 465 | 337
Amortization of Net Actuarial Losses |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other Comprehensive Income, before tax | 378 | 291 | 755 | 582
Other Comprehensive Income, tax | 100 | 78 | 200 | 155
Other Comprehensive Income | 278 | 213 | 555 | 427
Amortization of Prior Service Credit |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other Comprehensive Income, before tax | (61) | (61) | (123) | (122)
Other Comprehensive Income, tax | (16) | (16) | (33) | (32)
Other Comprehensive Income | $ (45) | $ (45) | $ (90) | $ (90)

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