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Goodwill and Intangible Assets - Carrying Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Carrying amount of intangible assets    
Gross carrying amount $ 110,866 $ 92,866
Accumulated amortization (50,184) (44,807)
Net carrying amount 60,682 48,059
Core deposit intangible    
Carrying amount of intangible assets    
Gross carrying amount 91,566 91,566
Accumulated amortization (48,765) (44,775)
Net carrying amount 42,801 46,791
Customer relationship intangible    
Carrying amount of intangible assets    
Gross carrying amount 17,000 1,300
Accumulated amortization (1,266) (32)
Net carrying amount 15,734 $ 1,268
Internally developed technology    
Carrying amount of intangible assets    
Gross carrying amount 2,300  
Accumulated amortization (153)  
Net carrying amount $ 2,147