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Loans - Narrative, Loan-to-Value Ratios (Details)
Mar. 31, 2020
Commercial real estate  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loan to value ratio, less than 35.00%
One-to-four family residential mortgage  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loan to value ratio, less than 60.00%