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Goodwill and Intangible Assets - Carrying Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Carrying amount of intangible assets    
Gross carrying amount $ 110,866 $ 110,866
Accumulated amortization (58,154) (52,192)
Net carrying amount 52,712 58,674
Core deposit intangible    
Carrying amount of intangible assets    
Gross carrying amount 91,566 91,566
Accumulated amortization (54,087) (50,095)
Net carrying amount 37,479 41,471
Customer relationship intangible    
Carrying amount of intangible assets    
Gross carrying amount 17,000 17,000
Accumulated amortization (3,492) (1,867)
Net carrying amount 13,508 15,133
Internally developed technology    
Carrying amount of intangible assets    
Gross carrying amount 2,300 2,300
Accumulated amortization (575) (230)
Net carrying amount $ 1,725 $ 2,070