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Non-Performing Assets Including Troubled Debt Restructurings (TDR) - types of payment relief that have been granted (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Jun. 30, 2020
USD ($)
Financing Receivable, Modifications [Line Items]      
Number of loans | loan 67 70  
Loans For Which Payment Relief Has Been Requested | $ $ 49,632 $ 49,063  
Interest only payments      
Financing Receivable, Modifications [Line Items]      
Number of loans | loan 13 11  
Loans For Which Payment Relief Has Been Requested | $ $ 32,427 $ 26,900  
Complete payment deferrals      
Financing Receivable, Modifications [Line Items]      
Number of loans | loan 54 59  
Loans For Which Payment Relief Has Been Requested | $ $ 17,205 $ 22,163 $ 200,000