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Other Comprehensive (Loss) Income - Schedule of Changes in Each Component of Accumulated Other Comprehensive income (loss), Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Investment securities available-for-sale: |  |  |  |
Beginning balance | $ 1,169,459 | $ 1,219,766 | $ 1,274,283 | $ 1,228,321
Other comprehensive income (loss) before reclassifications |  |  | 33,901 | (15,452)
Amortization of unrealized loss on securities transferred to held-to-maturity | 1,355 | 1,400 | 4,062 | 3,444
Net other comprehensive income (loss) during period | 36,666 | (19,918) | 38,180 | (11,998)
Ending balance | 1,225,424 | 1,215,884 | 1,225,424 | 1,215,884
Securities Available-For-Sale |  |  |  |
Investment securities available-for-sale: |  |  |  |
Beginning balance | (123,689) | (148,897) | (122,246) | (154,773)
Other comprehensive income (loss) before reclassifications | 35,338 | (21,314) | 33,901 | (15,452)
Amounts reclassified from accumulated other comprehensive income (loss) | (2) | (4) | (8) | 10
Amortization of unrealized loss on securities transferred to held-to-maturity | 0 | 0 | 0 | 0
Net other comprehensive income (loss) during period | 35,336 | (21,318) | 33,893 | (15,442)
Ending balance | (88,353) | (170,215) | (88,353) | (170,215)
Securities Held-to-Maturity |  |  |  |
Investment securities available-for-sale: |  |  |  |
Beginning balance | (37,222) | (42,690) | (39,929) | (44,734)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0
Amortization of unrealized loss on securities transferred to held-to-maturity | 1,355 | 1,400 | 4,062 | 3,444
Net other comprehensive income (loss) during period | 1,355 | 1,400 | 4,062 | 3,444
Ending balance | (35,867) | (41,290) | (35,867) | (41,290)
Derivatives |  |  |  |
Investment securities available-for-sale: |  |  |  |
Beginning balance | 68 | 0 | (182) | 0
Other comprehensive income (loss) before reclassifications | (25) | 0 | 225 | 0
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0
Amortization of unrealized loss on securities transferred to held-to-maturity | 0 | 0 | 0 | 0
Net other comprehensive income (loss) during period | (25) | 0 | 225 | 0
Ending balance | 43 | 0 | 43 | 0
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Investment securities available-for-sale: |  |  |  |
Beginning balance | (160,843) | (191,587) | (162,357) | (199,507)
Other comprehensive income (loss) before reclassifications | 35,313 | (21,314) | 34,126 | (15,452)
Amounts reclassified from accumulated other comprehensive income (loss) | (2) | (4) | (8) | 10
Amortization of unrealized loss on securities transferred to held-to-maturity | 1,355 | 1,400 | 4,062 | 3,444
Net other comprehensive income (loss) during period | 36,666 | (19,918) | 38,180 | (11,998)
Ending balance | $ (124,177) | $ (211,505) | $ (124,177) | $ (211,505)

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