Equity method investment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	$ 32,761		$ 34,555
Amortization of Intangible Assets	1,794	$ 1,871
Dividends received from equity method investment	23,961	12,232
Loans	30,297,871		29,041,605
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	6,200		6,300
Amortization of Intangible Assets	87	128
Accretion income	95	243
Dividends received from equity method investment	24,000	12,200
Payments to Acquire Loans Held-for-investment	0	$ 0
Loans	$ 329,300		$ 350,600

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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