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Business segment information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Reporting Segment [Line Items] |  |  |
Interest income | $ 180,973 | $ 273,682 | $ 258,490
Interest expense | (88,523) | (164,167) | (148,747)
Inter-segment net interest income | 0 | 0 | 0
Net interest income | 92,450 | 109,515 | 109,743
Other income (expense), net | 6,707 | 17,142 | 17,846
Total income | 99,157 | 126,657 | 127,589
Reversal of (provision for) credit losses | 1,464 | (430) | (57,515)
Gain (loss) on non-financial assets, net | (296) | (500) | 5,967
Operating expenses | (37,324) | (40,674) | (48,918)
Segment profit (loss) | 63,593 | 86,053 | 11,138
Segment assets | 6,288,898 | 7,249,666 | 7,609,185
Segment liabilities | 5,250,978 | 6,233,499 | 6,615,595
Reportable segments [member] |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Segment profit (loss) | 63,593 | 86,053 | 15,189
Segment assets | 6,282,090 | 7,240,835 | 7,592,492
Segment liabilities | 5,232,264 | 6,216,350 | 6,601,980
Commercial [Member] |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Interest income | 172,548 | 253,462 | 239,976
Interest expense | (690) | (730) | 0
Inter-segment net interest income | (83,937) | (144,334) | (130,195)
Net interest income | 87,921 | 108,398 | 109,781
Other income (expense), net | 8,597 | 15,577 | 18,002
Total income | 96,518 | 123,975 | 127,783
Reversal of (provision for) credit losses | 1,889 | (744) | (57,621)
Gain (loss) on non-financial assets, net | (296) | (500) | 5,967
Operating expenses | (28,021) | (31,183) | (37,436)
Commercial [Member] | Reportable segments [member] |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Segment profit (loss) | 70,682 | 92,548 | 26,759
Segment assets | 4,989,009 | 5,967,157 | 5,734,159
Segment liabilities | 92,309 | 134,657 | 12,985
Treasury [Member] |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Interest income | 8,425 | 20,220 | 18,514
Interest expense | (87,833) | (163,437) | (148,747)
Inter-segment net interest income | 83,937 | 144,334 | 130,195
Net interest income | 4,529 | 1,117 | (38)
Other income (expense), net | (1,890) | 1,565 | (156)
Total income | 2,639 | 2,682 | (194)
Reversal of (provision for) credit losses | (425) | 314 | 106
Gain (loss) on non-financial assets, net | 0 | 0 | 0
Operating expenses | (9,303) | (9,491) | (11,482)
Treasury [Member] | Reportable segments [member] |  |  |
Disclosure of Reporting Segment [Line Items] |  |  |
Segment profit (loss) | (7,089) | (6,495) | (11,570)
Segment assets | 1,293,081 | 1,273,678 | 1,858,333
Segment liabilities | $ 5,139,955 | $ 6,081,693 | $ 6,588,995

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