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Servicing rights - Assumptions (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Multi-family    
Adverse changes to key assumptions on the carrying amount of the servicing rights    
Prepayment rate (10% adverse change) $ (280) $ (291)
Prepayment rate (20% adverse change) (553) (575)
Default rate (10% adverse change) (25) (25)
Default rate (20% adverse change) (49) (50)
Discount rate (10% adverse change) (1,894) (1,910)
Discount rate (20% adverse change) (3,698) (3,726)
Cost of servicing (10% adverse change) (2,658) (2,659)
Cost of servicing (20% adverse change) (5,316) (5,318)
SBA    
Adverse changes to key assumptions on the carrying amount of the servicing rights    
Prepayment rate (10% adverse change) (679) (670)
Prepayment rate (20% adverse change) (1,320) (1,305)
Default rate (10% adverse change) (146) (155)
Default rate (20% adverse change) (290) (309)
Discount rate (10% adverse change) (828) (746)
Discount rate (20% adverse change) (1,591) (1,443)
Cost of servicing (10% adverse change) (1,339) (1,344)
Cost of servicing (20% adverse change) $ (2,679) $ (2,687)