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Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   $ 1,638,394 $ 1,402,961 $ 1,366,217
Unrealized gains (losses) arising during period, before tax   21,672 31,146 (236,834)
Income tax effect   (5,467) (7,911) 61,577
Other comprehensive income (loss) before reclassifications   16,205 23,235 (175,257)
Reclassification adjustments for losses (gains) included in net income, before tax   27,009 (574) 23,164
Income, tax effect   (7,099) 146 (6,023)
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity $ 50,000 5,247 4,986 0
Income tax effect   (1,353) (1,266) 0
Amounts reclassified from accumulated other comprehensive income (loss) to net income   23,804 3,292 17,141
Other comprehensive income (loss), net of income tax effect   40,009 26,527 (158,116)
Ending balance   1,836,683 1,638,394 1,402,961
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   (136,569) (163,096) (4,980)
Other comprehensive income (loss), net of income tax effect   40,009 26,527 (158,116)
Ending balance   $ (96,560) $ (136,569) $ (163,096)