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Business segment information - Schedule of certain information regarding the bank's operations by segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Reporting Segment [Line Items]      
Interest income $ 679,260 $ 332,621 $ 140,883
Interest expense (446,077) (184,610) (54,101)
Inter-segment net interest income 0 0 0
Net interest income 233,183 148,011 86,782
Other income (expense), net 32,936 18,661 17,424
Total revenues 266,119 166,672 104,206
Provision for credit losses (27,463) (19,521) (2,328)
Gain on non-financial assets, net     742
Operating expenses (72,498) (55,111) (39,923)
Segment profit (loss) 166,158 92,040 62,697
Segment assets 10,743,792 9,283,910 8,038,111
Total liabilities 9,539,968 8,214,563 7,046,321
Reportable segments      
Disclosure of Reporting Segment [Line Items]      
Segment profit (loss) 166,158 92,040 62,697
Segment assets 10,729,764 9,277,293 8,029,693
Total liabilities 9,486,234 8,187,752 7,031,960
Commercial      
Disclosure of Reporting Segment [Line Items]      
Interest income 566,212 289,785 129,758
Interest expense (467) (463) (648)
Inter-segment net interest income (361,997) (155,968) (45,318)
Net interest income 203,748 133,354 83,792
Other income (expense), net 33,792 20,809 19,188
Total revenues 237,540 154,163 102,980
Provision for credit losses (26,785) (13,376) (1,050)
Gain on non-financial assets, net     742
Operating expenses (57,324) (43,156) (30,751)
Commercial | Reportable segments      
Disclosure of Reporting Segment [Line Items]      
Segment profit (loss) 153,431 97,631 71,921
Segment assets 7,498,230 6,940,335 5,931,201
Total liabilities 279,853 180,369 219,505
Treasury      
Disclosure of Reporting Segment [Line Items]      
Interest income 113,048 42,836 11,125
Interest expense (445,610) (184,147) (53,453)
Inter-segment net interest income 361,997 155,968 45,318
Net interest income 29,435 14,657 2,990
Other income (expense), net (856) (2,148) (1,764)
Total revenues 28,579 12,509 1,226
Provision for credit losses (678) (6,145) (1,278)
Gain on non-financial assets, net     0
Operating expenses (15,174) (11,955) (9,172)
Treasury | Reportable segments      
Disclosure of Reporting Segment [Line Items]      
Segment profit (loss) 12,727 (5,591) (9,224)
Segment assets 3,231,534 2,336,958 2,098,492
Total liabilities $ 9,206,381 $ 8,007,383 $ 6,812,455