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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   $ 1,402,961 $ 1,366,217 $ 1,117,086
Unrealized gains (losses) arising during period, before tax   31,146 (236,834) 5,480
Income tax effect   (7,911) 61,577 (1,425)
Other comprehensive income (loss) before reclassifications   23,235 (175,257) 4,055
Reclassification adjustments for losses (gains) included in net income, before tax   (574) 23,164 (4,420)
Income, tax effect   146 (6,023) 1,149
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity $ 50,000 4,986 0 0
Income tax effect   (1,266) 0 0
Amounts reclassified from accumulated other comprehensive income (loss) to net income   3,292 17,141 (3,271)
Other comprehensive income (loss), net of income tax effect   26,527 (158,116) 784
Ending balance   1,638,394 1,402,961 1,366,217
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   (163,096) (4,980) (5,764)
Other comprehensive income (loss), net of income tax effect   26,527 (158,116) 784
Ending balance   (136,569) (163,096) (4,980)
Unrealized Gains (Losses) on AFS Securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   (163,096) (4,980) 23,312
Unrealized gains (losses) arising during period, before tax   31,146 (236,834) (6,841)
Income tax effect   (7,911) 61,577 1,779
Other comprehensive income (loss) before reclassifications   23,235 (175,257) (5,062)
Reclassification adjustments for losses (gains) included in net income, before tax   (574) 23,164 (31,392)
Income, tax effect   146 (6,023) 8,162
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity   4,986    
Income tax effect   (1,266)    
Amounts reclassified from accumulated other comprehensive income (loss) to net income   3,292 17,141 (23,230)
Other comprehensive income (loss), net of income tax effect   26,527 (158,116) (28,292)
Ending balance   (136,569) (163,096) (4,980)
Unrealized Gains (Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance   0 0 (29,076)
Unrealized gains (losses) arising during period, before tax   0 0 12,321
Income tax effect   0 0 (3,204)
Other comprehensive income (loss) before reclassifications   0 0 9,117
Reclassification adjustments for losses (gains) included in net income, before tax   0 0 26,972
Income, tax effect   0 0 (7,013)
Amortization of unrealized loss on securities transferred from available-for-sale to held-to-maturity   0    
Income tax effect   0    
Amounts reclassified from accumulated other comprehensive income (loss) to net income   0 0 19,959
Other comprehensive income (loss), net of income tax effect   0 0 29,076
Ending balance   $ 0 $ 0 $ 0