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Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Other intangible assets          
Gross carrying amount $ 279,352   $ 279,352   $ 257,874
Accumulated amortization (146,658)   (146,658)   (129,807)
Net carrying amount 132,694   132,694   $ 128,067
Amortization expense 8,847 $ 8,968 17,341 $ 18,132  
Fair value of SBA servicing assets $ 6,400   $ 6,400    
Minimum          
Other intangible assets          
Estimated useful lives     2 years    
Maximum          
Other intangible assets          
Estimated useful lives     15 years