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Allowance for credit losses - Troubled debt restructuring according to their accruing status - Subnote (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable    
Financing Receivable Modifications Recorded Investment $ 1,693,102 $ 1,656,822
Accruing    
Financing Receivable    
Financing Receivable Modifications Recorded Investment 1,515,522 1,468,966
Mortgages    
Financing Receivable    
Financing Receivable Modifications Recorded Investment 1,252,911 1,255,713
Mortgages | Accruing    
Financing Receivable    
Financing Receivable Modifications Recorded Investment 1,151,887 1,143,204
Mortgages | Guaranteed by us sponsored entities | Accruing    
Financing Receivable    
Financing Receivable Modifications Recorded Investment $ 721,000 $ 716,000