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Segment reporting - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
channel
segment
Jun. 30, 2020
USD ($)
Segment Reporting Information [Line Items]        
Number of distinct reportable segments | segment     2  
Number of distinct delivery channels | channel     2  
Total net contribution reclassification to (from) segment realignment $ 56,742 $ 30,328 $ 125,204 $ 31,153
Warehouse line of credit interest rate   3.25%   3.25%
Mortgage        
Segment Reporting Information [Line Items]        
Total net contribution reclassification to (from) segment realignment 542 $ 33,616 16,890 $ 41,635
Interest paid $ 6,110 3,335 $ 11,510 5,710
Mortgage | Prime Interest Rate        
Segment Reporting Information [Line Items]        
Warehouse line of credit interest rate 3.25%   3.25%  
Banking        
Segment Reporting Information [Line Items]        
Total net contribution reclassification to (from) segment realignment $ 56,200 (3,288) $ 108,314 (10,482)
Segment Realignment, Reclassification Adjustment | Mortgage        
Segment Reporting Information [Line Items]        
Total net contribution reclassification to (from) segment realignment   5,398   8,874
Segment Realignment, Reclassification Adjustment | Banking        
Segment Reporting Information [Line Items]        
Total net contribution reclassification to (from) segment realignment   $ (5,398)   $ (8,874)