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Segment reporting - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     2  
Other noninterest expense $ 39,724 $ 29,335 $ 72,737 $ 59,648
Interest income 66,276 54,529 126,724 105,222
Mortgage Segment        
Segment Reporting Information [Line Items]        
Other noninterest expense 829 0 1,883 0
Interest paid $ 3,290 $ 4,517 $ 5,848 $ 9,025
Mortgage Segment | Prime Interest Rate        
Segment Reporting Information [Line Items]        
Warehouse line of credit interest rate 5.50% 5.00% 5.50% 5.00%
Banking Segment        
Segment Reporting Information [Line Items]        
Other noninterest expense $ 38,895 $ 29,335 $ 70,854 $ 59,648
Interest income $ 3,290 $ 4,517 $ 5,848 $ 9,025