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Fair Value of Financial Instruments - Valuation techniques and inputs used (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mortgage servicing assets | Maximum | Discounted cash flow | Discount rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 10.50%  
Mortgage servicing assets | Weighted Average | Discounted cash flow | Discount rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 9.10%  
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 9,917 $ 11,079
Fair Value, Inputs, Level 1 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 5,264 5,700
Fair Value, Inputs, Level 3 | Private issue CMO    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 253  
Fair Value, Inputs, Level 3 | Private issue CMO | Market comparable pricing | Comparability adjustment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impact to valuation from an increase in inputs on assets Increase  
Fair Value, Inputs, Level 3 | Private issue CMO | Minimum | Market comparable pricing | Comparability adjustment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 2.60%  
Fair Value, Inputs, Level 3 | Private issue CMO | Maximum | Market comparable pricing | Comparability adjustment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 3.00%  
Fair Value, Inputs, Level 3 | Private issue CMO | Weighted Average | Market comparable pricing | Comparability adjustment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 2.90%  
Fair Value, Inputs, Level 3 | Loans Held For Investment, at Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 4,386  
Fair Value, Inputs, Level 3 | Loans Held For Investment, at Fair Value [Member] | Relative value analysis | Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impact to valuation from an increase in inputs on assets Increase  
Fair Value, Inputs, Level 3 | Loans Held For Investment, at Fair Value [Member] | Relative value analysis | Credit risk factors    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impact to valuation from an increase in inputs on assets Decrease  
Fair Value, Inputs, Level 3 | Loans Held For Investment, at Fair Value [Member] | Minimum | Relative value analysis | Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 97.60%  
Fair Value, Inputs, Level 3 | Loans Held For Investment, at Fair Value [Member] | Minimum | Relative value analysis | Credit risk factors    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 1.20%  
Fair Value, Inputs, Level 3 | Loans Held For Investment, at Fair Value [Member] | Maximum | Relative value analysis | Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 104.10%  
Fair Value, Inputs, Level 3 | Loans Held For Investment, at Fair Value [Member] | Maximum | Relative value analysis | Credit risk factors    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 100.00%  
Fair Value, Inputs, Level 3 | Loans Held For Investment, at Fair Value [Member] | Weighted Average | Relative value analysis | Broker quotes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 101.40%  
Fair Value, Inputs, Level 3 | Loans Held For Investment, at Fair Value [Member] | Weighted Average | Relative value analysis | Credit risk factors    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 4.60%  
Fair Value, Inputs, Level 3 | Non-performing loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 684  
Fair Value, Inputs, Level 3 | Non-performing loans | Discounted cash flow | Default rates.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impact to valuation from an increase in inputs on assets Decrease  
Assets Fair Value Measurement Input 5.00%  
Fair Value, Inputs, Level 3 | Mortgage servicing assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 502  
Fair Value, Inputs, Level 3 | Mortgage servicing assets | Discounted cash flow | Prepayment speed (CPR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impact to valuation from an increase in inputs on assets Decrease  
Fair Value, Inputs, Level 3 | Mortgage servicing assets | Discounted cash flow | Discount rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impact to valuation from an increase in inputs on assets Decrease  
Fair Value, Inputs, Level 3 | Mortgage servicing assets | Minimum | Discounted cash flow | Prepayment speed (CPR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 15.30%  
Fair Value, Inputs, Level 3 | Mortgage servicing assets | Minimum | Discounted cash flow | Discount rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 9.00%  
Fair Value, Inputs, Level 3 | Mortgage servicing assets | Maximum | Discounted cash flow | Prepayment speed (CPR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 60.00%  
Fair Value, Inputs, Level 3 | Mortgage servicing assets | Weighted Average | Discounted cash flow | Prepayment speed (CPR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 25.10%  
Fair Value, Inputs, Level 3 | Interest-Only Strips    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 14  
Fair Value, Inputs, Level 3 | Interest-Only Strips | Discounted cash flow | Prepayment speed (CPR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impact to valuation from an increase in inputs on assets Decrease  
Fair Value, Inputs, Level 3 | Interest-Only Strips | Discounted cash flow | Discount rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impact to valuation from an increase in inputs on assets Decrease  
Assets Fair Value Measurement Input 9.00%  
Fair Value, Inputs, Level 3 | Interest-Only Strips | Minimum | Discounted cash flow | Prepayment speed (CPR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 20.40%  
Fair Value, Inputs, Level 3 | Interest-Only Strips | Maximum | Discounted cash flow | Prepayment speed (CPR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 40.60%  
Fair Value, Inputs, Level 3 | Interest-Only Strips | Weighted Average | Discounted cash flow | Prepayment speed (CPR)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 39.30%  
Fair Value, Inputs, Level 3 | Non-performing loans one    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 334  
Fair Value, Inputs, Level 3 | Non-performing loans one | Relative value analysis | Credit risk factors    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impact to valuation from an increase in inputs on assets Decrease  
Fair Value, Inputs, Level 3 | Non-performing loans one | Minimum | Relative value analysis | Loss severity.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 20.00%  
Fair Value, Inputs, Level 3 | Non-performing loans one | Maximum | Relative value analysis | Loss severity.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 30.00%  
Fair Value, Inputs, Level 3 | Non-performing loans one | Weighted Average | Relative value analysis | Loss severity.    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Fair Value Measurement Input 20.50%  
Fair Value, Inputs, Level 3 | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 4,653 $ 5,379