Equity method investment - Narrative (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
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	$ 37,617		$ 37,617		$ 33,819
Amortization of Intangible Assets	2,051	$ 2,167	3,922	$ 4,373
Dividends received from equity method investment			40,762	49,409
Loans	26,333,096		26,333,096		23,414,262
Bankers Healthcare Group, LLC
Schedule of Equity Method Investments [Line Items]
Technology, trade name and customer relationship intangibles	6,600		6,600		6,800
Amortization of Intangible Assets	128	188	256	376
Accretion income	188	395	431	846
Dividends received from equity method investment	28,500	39,400	40,800	49,400
Payments to Acquire Loans Held-for-investment	76,000	$ 50,300	76,000	$ 124,900
Loans	$ 351,400		$ 351,400		$ 319,100

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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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