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Derivative and Other Financial Instruments with Off-Balance Sheet Risks - Summary of derivative financial instruments and other loan sale agreements (Details 3) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Amount    
Derivative [Line Items]    
Derivative financial instruments $ (76,233) $ (90,355)
Fair Value    
Derivative [Line Items]    
Derivative financial instruments 735 385
Commitments to extend credit on loans to be held for sale | Amount    
Derivative [Line Items]    
Derivative financial instruments [1] 42,403 56,906
Commitments to extend credit on loans to be held for sale | Fair Value    
Derivative [Line Items]    
Derivative financial instruments [1] 496 825
Best efforts loan sale commitments | Amount    
Derivative [Line Items]    
Derivative financial instruments (24,843) (29,502)
Best efforts loan sale commitments | Fair Value    
Derivative [Line Items]    
Derivative financial instruments 0 0
Mandatory loan sale commitments and TBA MBS trades | Amount    
Derivative [Line Items]    
Derivative financial instruments (93,793) (117,759)
Mandatory loan sale commitments and TBA MBS trades | Fair Value    
Derivative [Line Items]    
Derivative financial instruments $ 239 $ (440)
[1] Net of 22.6% at September 30, 2018 and 24.7% at June 30, 2018 of commitments which management has estimated may not fund.