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Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 1,376,099 | $ 1,299,961 | $ 1,372,380 | $ 1,031,596
Other comprehensive loss before reclassifications | 6,619 | (24,142) | (8,092) | 3,766
Amounts reclassified from accumulated other comprehensive income | 163 | 34 | 931 | 67
Net current-period other comprehensive (loss) income | 6,782 | (24,108) | (7,161) | 3,833
Ending balance | 1,404,342 | 1,297,642 | 1,404,342 | 1,297,642
Unrealized Loss on Securities Available for Sale |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (321,915) | (314,109) | (307,953) | (342,017)
Other comprehensive loss before reclassifications | 6,619 | (24,142) | (8,092) | 3,766
Amounts reclassified from accumulated other comprehensive income | 143 | 0 | 892 | 0
Net current-period other comprehensive (loss) income | 6,762 | (24,142) | (7,200) | 3,766
Ending balance | (315,153) | (338,251) | (315,153) | (338,251)
Postretirement Plans Asset (Liability) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (58) | 75 | (77) | 42
Other comprehensive loss before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income | 20 | 34 | 39 | 67
Net current-period other comprehensive (loss) income | 20 | 34 | 39 | 67
Ending balance | (38) | 109 | (38) | 109
AOCI Attributable to Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (321,973) | (314,034) | (308,030) | (341,975)
Ending balance | $ (315,191) | $ (338,142) | $ (315,191) | $ (338,142)

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