v3.25.4

Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss) by Component) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | $ 1,893,924 | $ 1,862,624
Other comprehensive income (loss) | 0 | 42,421
Balance | 1,900,965 | 1,914,277
Other Comprehensive Income (Loss), Tax | 6,224 | 5,964
Unrealized gain (losses) on securities available for sale |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | (16,590) | (21,059)
Other comprehensive loss before reclassifications, net of tax | 1,845 | (5,503)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 0 | 0
Other comprehensive income (loss) | 1,845 | (5,503)
Balance | (14,745) | (26,562)
Other Comprehensive Income (Loss), Tax | 432 | (1,634)
Defined Benefit Plan |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | (3,609) | (3,435)
Other comprehensive loss before reclassifications, net of tax | 56 | 0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 0 | 0
Other comprehensive income (loss) | 56 | 0
Balance | (3,553) | (3,435)
Other Comprehensive Income (Loss), Tax | (56) | 0
Defined Benefit Plan | Reclassification out of Accumulated Other Comprehensive Income |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other Comprehensive Income (Loss), Tax | 0 | 0
Total |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | (21,231) | (15,608)
Other comprehensive loss before reclassifications, net of tax | 5,038 | 53,841
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | (5,038) | (11,420)
Other comprehensive income (loss) | 0 | 42,421
Balance | (21,231) | 26,813
Other Comprehensive Income (Loss), Tax | (215) | 12,597
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Balance | (1,032) | 8,886
Other comprehensive loss before reclassifications, net of tax | 3,137 | 59,344
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | (5,038) | (11,420)
Other comprehensive income (loss) | (1,901) | 47,924
Balance | (2,933) | 56,810
Other Comprehensive Income (Loss), Tax | (591) | 14,231
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Other Comprehensive Income (Loss), Tax | $ (1,543) | $ (3,392)

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