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Fair Value Measurements - Recurring and Nonrecurring (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | $ 1,969,869 |  | $ 1,969,869 |  | $ 2,380,563
Total financial assets | 3,482,535 |  | 3,482,535 |  | 4,017,983
Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 1,969,869 |  | 1,969,869 |  | 2,380,563
Interest rate contracts | 22,085 |  | 22,085 |  | 11,879
Total financial assets | 1,991,954 |  | 1,991,954 |  | 2,392,442
Total financial liabilities | 61,012 |  | 61,012 |  | 27,400
Recurring | Interest rate contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 22,085 |  | 22,085 |  | 11,879
Recurring | Commercial loan hedge |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 3,394 |  | 3,394 |  | 966
Recurring | Long term borrowing hedge |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 35,533 |  | 35,533 |  | 14,555
Recurring | Equity securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 101,885 |  | 101,885 |  | 101,952
Recurring | Obligations of U.S. government |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 249,053 |  | 249,053 |  | 482,464
Recurring | Obligations of states and political subdivisions |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 27,488 |  | 27,488 |  | 27,123
Recurring | Corporate debt securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 460,399 |  | 460,399 |  | 505,800
Recurring | Agency pass-through certificates |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 1,046,506 |  | 1,046,506 |  | 1,160,518
Recurring | Commercial MBS |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 84,538 |  | 84,538 |  | 102,706
Recurring | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 101,885 |  | 101,885 |  | 101,952
Interest rate contracts | 0 |  | 0 |  | 0
Total financial assets | 101,885 |  | 101,885 |  | 101,952
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] |  |  |  |  |
Interest rate contracts | 0 |  | 0 |  | 0
Recurring | Level 1 | Commercial loan hedge |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 0 |  | 0 |  | 0
Recurring | Level 1 | Long term borrowing hedge |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 0 |  | 0 |  | 0
Recurring | Level 1 | Equity securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 101,885 |  | 101,885 |  | 101,952
Recurring | Level 1 | Obligations of U.S. government |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 0 |  | 0 |  | 0
Recurring | Level 1 | Obligations of states and political subdivisions |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 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, at fair value | 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, at fair value | 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, at fair value | 0 |  | 0 |  | 0
Recurring | Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 1,867,984 |  | 1,867,984 |  | 2,278,611
Interest rate contracts | 22,085 |  | 22,085 |  | 11,879
Total financial assets | 1,890,069 |  | 1,890,069 |  | 2,290,490
Total financial liabilities | 61,012 |  | 61,012 |  | 27,400
Recurring | Level 2 | Interest rate contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 22,085 |  | 22,085 |  | 11,879
Recurring | Level 2 | Commercial loan hedge |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 3,394 |  | 3,394 |  | 966
Recurring | Level 2 | Long term borrowing hedge |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 35,533 |  | 35,533 |  | 14,555
Recurring | Level 2 | Equity securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 0 |  | 0 |  | 0
Recurring | Level 2 | Obligations of U.S. government |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 249,053 |  | 249,053 |  | 482,464
Recurring | Level 2 | Obligations of states and political subdivisions |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 27,488 |  | 27,488 |  | 27,123
Recurring | Level 2 | Corporate debt securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 460,399 |  | 460,399 |  | 505,800
Recurring | Level 2 | Agency pass-through certificates |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 1,046,506 |  | 1,046,506 |  | 1,160,518
Recurring | Level 2 | Commercial MBS |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 84,538 |  | 84,538 |  | 102,706
Recurring | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 0 |  | 0 |  | 0
Interest rate contracts | 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] |  |  |  |  |
Interest rate contracts | 0 |  | 0 |  | 0
Recurring | Level 3 | Commercial loan hedge |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 0 |  | 0 |  | 0
Recurring | Level 3 | Long term borrowing hedge |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest rate contracts | 0 |  | 0 |  | 0
Recurring | Level 3 | Equity securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 0 |  | 0 |  | 0
Recurring | Level 3 | Obligations of U.S. government |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 0 |  | 0 |  | 0
Recurring | Level 3 | Obligations of states and political subdivisions |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale securities, at fair value | 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, at fair value | 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, at fair value | 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, at fair value | 0 |  | 0 |  | $ 0
Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 35,577 | $ 80,516 | 35,577 | $ 80,516 |
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 | (1,306) | (5,987) | (6,706) | 4,202 |
Nonrecurring | Impaired loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 15,724 | 6,735 | 15,724 | 6,735 |
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 | (692) | (3,621) | (3,762) | (4,201) |
Nonrecurring | Real Estate Owned |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 19,853 | 73,781 | 19,853 | 73,781 |
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 | (614) | (2,366) | (2,944) | 8,403 |
Nonrecurring | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 0 | 0 | 0 | 0 |
Nonrecurring | Level 1 | Impaired loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 0 | 0 | 0 | 0 |
Nonrecurring | Level 1 | Real Estate Owned |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 0 | 0 | 0 | 0 |
Nonrecurring | Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 0 | 0 | 0 | 0 |
Nonrecurring | Level 2 | Impaired loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 0 | 0 | 0 | 0 |
Nonrecurring | Level 2 | Real Estate Owned |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 0 | 0 | 0 | 0 |
Nonrecurring | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 35,577 | 80,516 | 35,577 | 80,516 |
Nonrecurring | Level 3 | Impaired loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | 15,724 | 6,735 | 15,724 | 6,735 |
Nonrecurring | Level 3 | Real Estate Owned |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, nonrecurring | $ 19,853 | $ 73,781 | $ 19,853 | $ 73,781 |

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