Equity method investment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	$ 35,666		$ 35,666		$ 33,819
Amortization of Intangible Assets	1,951	$ 2,088	5,873	$ 6,461
Dividends received from equity method investment			59,401	66,221
Loans	27,711,694		27,711,694		23,414,262
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	6,400		6,400		6,800
Amortization of Intangible Assets	128	188	384	564
Accretion income	164	349	595	1,200
Dividends received from equity method investment	18,600	16,800	59,400	66,200
Payments to Acquire Loans Held-for-investment	49,600	$ 75,800	125,600	$ 200,700
Loans	$ 374,300		$ 374,300		$ 319,100

Accretion of discount into income

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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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