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Goodwill and Intangible Assets - Carrying Amounts (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Carrying amount of intangible assets    
Gross carrying amount $ 110,866 $ 110,866
Accumulated amortization (54,200) (52,192)
Net carrying amount 56,666 58,674
Core deposit intangible    
Carrying amount of intangible assets    
Gross carrying amount 91,566 91,566
Accumulated amortization (51,425) (50,095)
Net carrying amount 40,141 41,471
Customer relationship intangible    
Carrying amount of intangible assets    
Gross carrying amount 17,000 17,000
Accumulated amortization (2,430) (1,867)
Net carrying amount 14,570 15,133
Internally developed technology    
Carrying amount of intangible assets    
Gross carrying amount 2,300 2,300
Accumulated amortization (345) (230)
Net carrying amount $ 1,955 $ 2,070