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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Reporting Segment [Line Items] |  |  |
Interest income | $ 140,883 | $ 180,973 | $ 273,682
Interest expense | (54,101) | (88,523) | (164,167)
Inter-segment net interest income | 0 | 0 | 0
Net interest income | 86,782 | 92,450 | 109,515
Other income (expense), net | 17,424 | 6,707 | 17,142
Total revenues | 104,206 | 99,157 | 126,657
Provision for credit losses | (2,328) | 1,464 | (430)
Gain (loss) on non-financial assets, net | 742 | 296 | 500
Operating expenses | (39,923) | (37,324) | (40,674)
Segment profit (loss) | 62,697 | 63,593 | 86,053
Segment assets | 8,038,111 | 6,288,898 | 7,249,666
Total liabilities | 7,046,321 | 5,250,978 | 6,233,499
Reportable segments |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Segment profit (loss) | 62,697 | 63,593 | 86,053
Segment assets | 8,029,693 | 6,282,090 | 7,240,835
Total liabilities | 7,031,960 | 5,232,264 | 6,216,350
Commercial |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Interest income | 129,758 | 172,548 | 253,462
Interest expense | (648) | (690) | (730)
Inter-segment net interest income | (45,318) | (83,937) | (144,334)
Net interest income | 83,792 | 87,921 | 108,398
Other income (expense), net | 19,188 | 8,597 | 15,577
Total revenues | 102,980 | 96,518 | 123,975
Provision for credit losses | (1,050) | 1,889 | (744)
Gain (loss) on non-financial assets, net | 742 | 296 | 500
Operating expenses | (30,751) | (28,021) | (31,183)
Commercial | Reportable segments |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Segment profit (loss) | 71,921 | 70,682 | 92,548
Segment assets | 5,931,201 | 4,989,009 | 5,967,157
Total liabilities | 219,505 | 92,309 | 134,657
Treasury |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Interest income | 11,125 | 8,425 | 20,220
Interest expense | (53,453) | (87,833) | (163,437)
Inter-segment net interest income | 45,318 | 83,937 | 144,334
Net interest income | 2,990 | 4,529 | 1,117
Other income (expense), net | (1,764) | (1,890) | 1,565
Total revenues | 1,226 | 2,639 | 2,682
Provision for credit losses | (1,278) | (425) | 314
Gain (loss) on non-financial assets, net | 0 | 0 | 0
Operating expenses | (9,172) | (9,303) | (9,491)
Treasury | Reportable segments |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Segment profit (loss) | (9,224) | (7,089) | (6,495)
Segment assets | 2,098,492 | 1,293,081 | 1,273,678
Total liabilities | $ 6,812,455 | $ 5,139,955 | $ 6,081,693

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