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Accumulated Other Comprehensive Income - AOCI Components Pre Post & Tax Effect (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Net Unrealized Gains Arising During the Period, net | $ 18,451 | $ 34,271 | $ 53,672 | $ 47,078
Reclassification from AOCI, net | 4,492 | 4,730 | 13,466 | 14,250
Other Comprehensive Income, before tax | 31,218 | 53,059 | 91,347 | 83,441
Other Comprehensive Income, tax | 8,275 | 14,058 | 24,209 | 22,113
Other Comprehensive Income | 22,943 | 39,001 | 67,138 | 61,328
Net Unrealized Gains on Investment Securities |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other Comprehensive Income, before tax | 30,901 | 52,830 | 90,398 | 82,752
Other Comprehensive Income, tax | 8,190 | 13,997 | 23,957 | 21,929
Other Comprehensive Income | 22,711 | 38,833 | 66,441 | 60,823
Investment Securities-Available-for-Sale |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Net Unrealized Gains Arising During the Period, before tax | 25,105 | 46,623 | 73,024 | 64,049
Net Unrealized Gains Arising During the Period, tax | 6,654 | 12,352 | 19,352 | 16,971
Net Unrealized Gains Arising During the Period, net | 18,451 | 34,271 | 53,672 | 47,078
Reclassification from AOCI, net | 0 | 0 | 0 | 0
Other Comprehensive Income | 18,451 | 34,271 | 53,672 | 47,078
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 | 5,796 | 6,207 | 17,374 | 18,703
Reclassification from AOCI, tax | 1,536 | 1,645 | 4,605 | 4,958
Reclassification from AOCI, net | 4,260 | 4,562 | 12,769 | 13,745
Other Comprehensive Income | 4,260 | 4,562 | 12,769 | 13,745
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 | 232 | 168 | 697 | 505
Other Comprehensive Income, before tax | 317 | 229 | 949 | 689
Other Comprehensive Income, tax | 85 | 61 | 252 | 184
Other Comprehensive Income | 232 | 168 | 697 | 505
Amortization of Net Actuarial Losses |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other Comprehensive Income, before tax | 378 | 291 | 1,133 | 873
Other Comprehensive Income, tax | 100 | 77 | 300 | 232
Other Comprehensive Income | 278 | 214 | 833 | 641
Amortization of Prior Service Credit |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Other Comprehensive Income, before tax | (61) | (62) | (184) | (184)
Other Comprehensive Income, tax | (15) | (16) | (48) | (48)
Other Comprehensive Income | $ (46) | $ (46) | $ (136) | $ (136)

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