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Fee and commission income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fee and commission income (expense) $ 10,418 $ 15,647 $ 17,185
Issuance And Confirmation [Member]      
Fee and commission income (expense) 9,490 9,693 11,019
Negotiation And Acceptance [Member]      
Fee and commission income (expense) 183 399 379
Amendment [Member]      
Fee and commission income (expense) 688 605 869
Structuring [Member]      
Fee and commission income (expense) 603 5,622 4,950
Other [Member]      
Fee and commission income (expense) (546) (672) (32)
Syndicated loans [Member]      
Fee and commission income (expense) 603 5,622 4,950
Syndicated loans [Member] | Issuance And Confirmation [Member]      
Fee and commission income (expense) 0 0 0
Syndicated loans [Member] | Negotiation And Acceptance [Member]      
Fee and commission income (expense) 0 0 0
Syndicated loans [Member] | Amendment [Member]      
Fee and commission income (expense) 0 0 0
Syndicated loans [Member] | Structuring [Member]      
Fee and commission income (expense) 603 5,622 4,950
Syndicated loans [Member] | Other [Member]      
Fee and commission income (expense) 0 0 0
Documentary and stand-by Letters of Credit [Member]      
Fee and commission income (expense) 9,000 9,506 10,767
Documentary and stand-by Letters of Credit [Member] | Issuance And Confirmation [Member]      
Fee and commission income (expense) 8,090 8,381 9,281
Documentary and stand-by Letters of Credit [Member] | Negotiation And Acceptance [Member]      
Fee and commission income (expense) 183 399 379
Documentary and stand-by Letters of Credit [Member] | Amendment [Member]      
Fee and commission income (expense) 688 632 1,020
Documentary and stand-by Letters of Credit [Member] | Structuring [Member]      
Fee and commission income (expense) 0 0 0
Documentary and stand-by Letters of Credit [Member] | Other [Member]      
Fee and commission income (expense) 39 94 87
Other [Member]      
Fee and commission income (expense) 815 519 1,468
Other [Member] | Issuance And Confirmation [Member]      
Fee and commission income (expense) 1,400 1,312 1,738
Other [Member] | Negotiation And Acceptance [Member]      
Fee and commission income (expense) 0 0 0
Other [Member] | Amendment [Member]      
Fee and commission income (expense) 0 (27) (151)
Other [Member] | Structuring [Member]      
Fee and commission income (expense) 0 0 0
Other [Member] | Other [Member]      
Fee and commission income (expense) $ (584) $ (766) $ (119)