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Premises and Equipment (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | $ 330,681 | $ 270,591 |
Less accumulated depreciation and amortization | (73,138) | (64,419) |
Premises and equipment, net | 257,543 | 206,172 |
Future minimum payments due, current | 6,221 |  |
Future minimum payments due, two years | 4,179 |  |
Future minimum payments due, three years | 3,154 |  |
Future minimum payments due, four years | 2,593 |  |
Future minimum payments due, five years and thereafter | 12,281 |  |
Rental expense | 6,600 | 4,680 | 3,825
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 113,353 | 92,560 |
Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 143,627 | 132,822 |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 8,547 | 8,411 |
Capitalized software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 11,557 | 0 |
Estimated useful life | 5 years | 5 years |
Furniture, fixtures and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | $ 53,597 | $ 36,798 |
Minimum | Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 25 years | 25 years |
Minimum | Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 7 years | 7 years |
Minimum | Furniture, fixtures and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 2 years | 2 years |
Maximum | Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 40 years | 40 years |
Maximum | Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 15 years | 15 years |
Maximum | Furniture, fixtures and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 10 years | 10 years |

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