Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Other intangible assets
Gross carrying amount	$ 274,455		$ 274,455		$ 274,869
Accumulated amortization	(179,361)		(179,361)		(158,419)
Net carrying amount	95,094		95,094		116,450
Amortization expense	6,616	$ 7,837	20,943	$ 25,178
Fair value of SBA servicing assets	$ 5,700		$ 5,700		$ 6,100
Minimum
Other intangible assets
Estimated useful lives	2 years		2 years
Maximum
Other intangible assets
Estimated useful lives	15 years		15 years