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Allowance for credit losses - Allowance for loan losses - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
loans
NumberOfCustomer
Sep. 30, 2019
loans
Sep. 30, 2020
USD ($)
loans
NumberOfCustomer
Sep. 30, 2019
loans
Dec. 31, 2019
USD ($)
Financing Receivable          
Troubled debt restructurings $ 1,665,052   $ 1,665,052   $ 1,587,684
Aggregated unpaid principal balance         1,223,205
Loan count | loans 160 167 605 429  
Estimated Reserve for Loan losses $ 31,000   $ 31,000    
COVID-19          
Financing Receivable          
Percent of deferral payment expired 95.00%   95.00%    
Percent of loans on payment 95.00%   95.00%    
COVID-19 | Payment Deferral          
Financing Receivable          
Troubled debt restructurings $ 30,000   $ 30,000    
Loan receivables granted for moratorium 8,600,000   $ 8,600,000    
COVID-19 | Loan payment moratorium Completed          
Financing Receivable          
Number of loans | loans     124,884    
Loan payment moratorium - aggregate book value 7,900,000   $ 7,900,000    
COVID-19 | Loan Payment Moratorium Remaining          
Financing Receivable          
Number of loans | loans     5,915    
Loan payment moratorium - aggregate book value $ 700,000   $ 700,000    
COVID-19 | Retail | Loan Payment Moratorium Granted          
Financing Receivable          
Number of customers | NumberOfCustomer 125,736   125,736    
Loan receivables granted for moratorium $ 4,500,000   $ 4,500,000    
COVID-19 | Commercial Loans | Loan Payment Moratorium Granted          
Financing Receivable          
Number of customers | NumberOfCustomer 5,063   5,063    
Loan receivables granted for moratorium $ 4,100,000   $ 4,100,000    
Note A / B Split          
Financing Receivable          
Troubled debt restructurings 32,400   32,400    
Aggregated unpaid principal balance 32,800   32,800    
Loans restructuring charge offs     $ 100    
Loan count | loans     5    
Mortgages          
Financing Receivable          
Troubled debt restructurings $ 1,189,661   $ 1,189,661   1,139,597
Aggregated unpaid principal balance         624,368
Loan count | loans 23 32 215 31  
Commercial          
Financing Receivable          
Troubled debt restructurings $ 362,475   $ 362,475   349,448
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings $ 19,000   $ 19,000   $ 14,000