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Loans held for sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]      
Loans held for sale, at fair value $ 899,173 $ 262,518  
Mortgage Loans      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Net gains (losses) from fair value changes of mortgage loans 24,233 (2,861) $ (4,539)
Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Net gains (losses) from fair value changes of mortgage loans 3,228    
Loans held for sale, at fair value 215,403 0  
Residential real estate | 1-to-4 family mortgage      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Loans held for sale, at fair value $ 683,770 $ 262,518