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Transfers of financial assets and servicing assets - Initial fair value of assets obtained as proceeds from residential mortgage loans securitized (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized $ 195,665 $ 70,425 $ 386,742 $ 156,133
GNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 107,000 63,000 209,000 114,000
FNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 73,000 6,000 159,000 40,000
FHLMC        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 14,000   14,000  
Trading account debt securities        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 192,785 69,325 381,053 153,546
Trading account debt securities | GNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 106,729 63,384 208,717 114,032
Trading account debt securities | FNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 72,555 5,941 158,835 39,514
Trading account debt securities | FHLMC        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 13,501   13,501  
Mortgage Servicing Rights        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 2,880 1,100 5,689 2,587
Level 1        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 1 | Trading account debt securities        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 1 | Trading account debt securities | GNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 1 | Trading account debt securities | FNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 1 | Trading account debt securities | FHLMC        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0   0  
Level 1 | Mortgage Servicing Rights        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 2        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 192,785 69,325 381,053 153,546
Level 2 | Trading account debt securities        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 192,785 69,325 381,053 153,546
Level 2 | Trading account debt securities | GNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 106,729 63,384 208,717 114,032
Level 2 | Trading account debt securities | FNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 72,555 5,941 158,835 39,514
Level 2 | Trading account debt securities | FHLMC        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 13,501   13,501  
Level 2 | Mortgage Servicing Rights        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 3        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 2,880 1,100 5,689 2,587
Level 3 | Trading account debt securities        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 3 | Trading account debt securities | GNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 3 | Trading account debt securities | FNMA        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0 0 0 0
Level 3 | Trading account debt securities | FHLMC        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized 0   0  
Level 3 | Mortgage Servicing Rights        
Assets        
Initial fair value of the assets obtained as proceeds from residential mortgage loans securitized $ 2,880 $ 1,100 $ 5,689 $ 2,587