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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities $ 1,255,401   $ 1,255,401   $ 1,266,209
Total financial assets 2,865,435   2,865,435   2,902,122
Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 1,255,401   1,255,401   1,266,209
Total financial assets 1,287,740   1,287,740   1,267,348
Total financial liabilities 10,141   10,141   3,006
Recurring | Interest rate contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 10,141   10,141   1,139
Derivative liabilities 10,141   10,141   1,139
Recurring | Commercial loan hedges          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 3,005   3,005    
Derivative liabilities         174
Recurring | Borrowings hedges          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 19,193   19,193    
Derivative liabilities         1,693
Recurring | Equity securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 491   491   522
Recurring | U.S. government and agency securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 216,009   216,009   211,077
Recurring | Municipal bonds          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 22,755   22,755   26,624
Recurring | Corporate debt securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 184,232   184,232   185,298
Recurring | Agency pass-through certificates          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 828,449   828,449   834,297
Recurring | Commercial MBS          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 3,465   3,465   8,391
Recurring | Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 491   491   522
Total financial assets 491   491   522
Total financial liabilities 0   0   0
Recurring | Level 1 | Interest rate contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 0   0   0
Derivative liabilities 0   0   0
Recurring | Level 1 | Commercial loan hedges          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 0   0    
Derivative liabilities         0
Recurring | Level 1 | Borrowings hedges          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 0   0    
Derivative liabilities         0
Recurring | Level 1 | Equity securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 491   491   522
Recurring | Level 1 | U.S. government and agency securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 1 | Municipal bonds          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 1 | Corporate debt securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 1 | Agency pass-through certificates          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 1 | Commercial MBS          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 1,254,910   1,254,910   1,265,687
Total financial assets 1,287,249   1,287,249   1,266,826
Total financial liabilities 10,141   10,141   3,006
Recurring | Level 2 | Interest rate contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 10,141   10,141   1,139
Derivative liabilities 10,141   10,141   1,139
Recurring | Level 2 | Commercial loan hedges          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 3,005   3,005    
Derivative liabilities         174
Recurring | Level 2 | Borrowings hedges          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 19,193   19,193    
Derivative liabilities         1,693
Recurring | Level 2 | Equity securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 2 | U.S. government and agency securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 216,009   216,009   211,077
Recurring | Level 2 | Municipal bonds          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 22,755   22,755   26,624
Recurring | Level 2 | Corporate debt securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 184,232   184,232   185,298
Recurring | Level 2 | Agency pass-through certificates          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 828,449   828,449   834,297
Recurring | Level 2 | Commercial MBS          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 3,465   3,465   8,391
Recurring | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Total financial assets 0   0   0
Total financial liabilities 0   0   0
Recurring | Level 3 | Interest rate contracts          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 0   0   0
Derivative liabilities 0   0   0
Recurring | Level 3 | Commercial loan hedges          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 0   0    
Derivative liabilities         0
Recurring | Level 3 | Borrowings hedges          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative assets 0   0    
Derivative liabilities         0
Recurring | Level 3 | Equity securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 3 | U.S. government and agency securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 3 | Municipal bonds          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 3 | Corporate debt securities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 3 | Agency pass-through certificates          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   0
Recurring | Level 3 | Commercial MBS          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Available-for-sale securities 0   0   $ 0
Nonrecurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 21,479 $ 17,584 21,479 $ 17,584  
Nonrecurring | Changes measurement          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss related to impaired loans and real estate held for sale, measured on nonrecurring basis (3,217) (772) (4,750) (2,753)  
Nonrecurring | Impaired loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 15,125 7,807 15,125 7,807  
Nonrecurring | Impaired loans | Changes measurement          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss related to impaired loans and real estate held for sale, measured on nonrecurring basis (3,120) (305) (4,094) (1,666)  
Nonrecurring | Real estate owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 6,354 9,777 6,354 9,777  
Nonrecurring | Real estate owned | Changes measurement          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Loss related to impaired loans and real estate held for sale, measured on nonrecurring basis (97) (467) (656) (1,087)  
Nonrecurring | Level 1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 0 0 0 0  
Nonrecurring | Level 1 | Impaired loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 0 0 0 0  
Nonrecurring | Level 1 | Real estate owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 0 0 0 0  
Nonrecurring | Level 2          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 0 0 0 0  
Nonrecurring | Level 2 | Impaired loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 0 0 0 0  
Nonrecurring | Level 2 | Real estate owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 0 0 0 0  
Nonrecurring | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 21,479 17,584 21,479 17,584  
Nonrecurring | Level 3 | Impaired loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure 15,125 7,807 15,125 7,807  
Nonrecurring | Level 3 | Real estate owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, fair value disclosure $ 6,354 $ 9,777 $ 6,354 $ 9,777