Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Other intangible assets
Gross carrying amount	$ 274,880		$ 274,880		$ 274,753
Accumulated amortization	(203,045)		(203,045)		(185,977)
Net carrying amount	71,835		71,835		88,776
Amortization expense	5,327	$ 6,616	17,069	$ 20,943
Fair value of SBA servicing assets	$ 6,100		$ 6,100		$ 6,000
Minimum
Other intangible assets
Estimated useful lives	2 years		2 years
Maximum
Other intangible assets
Estimated useful lives	15 years		15 years