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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