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Fair Value of Financial Instruments - Corporation's assets measured at fair value at the dates indicated on a nonrecurring basis (Details) - Nonrecurring - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-performing loans $ 3,427 $ 6,218
Mortgage servicing assets 527 627
Real estate owned, net 0 0
Total 3,954 6,845
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-performing loans 0 0
Mortgage servicing assets 0 0
Real estate owned, net 0 0
Total 0 0
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-performing loans 2,420 3,971
Mortgage servicing assets 0 0
Real estate owned, net 0 0
Total 2,420 3,971
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-performing loans 1,007 2,247
Mortgage servicing assets 527 627
Real estate owned, net 0 0
Total $ 1,534 $ 2,874