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Segment reporting - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Segment Reporting Information [Line Items]    
Number of reportable segments | segment 2  
Other noninterest expense $ 33,013 $ 30,313
Interest income 60,448 50,693
Mortgage Segment    
Segment Reporting Information [Line Items]    
Other noninterest expense 1,054 0
Interest paid $ 2,558 $ 4,508
Mortgage Segment | Prime Interest Rate    
Segment Reporting Information [Line Items]    
Warehouse line of credit interest rate 5.50% 4.75%
Banking Segment    
Segment Reporting Information [Line Items]    
Other noninterest expense $ 31,959 $ 30,313
Interest income $ 2,558 $ 4,508