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Premises and Equipment (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | $ 218,640,000 | $ 212,884,000 |
Accumulated depreciation | (52,047,000) | (50,163,000) |
Premises and equipment, net | 166,593,000 | 162,721,000 |
Future minimum payments due, current | 2,400,000 |  |
Future minimum payments due, two years | 2,100,000 |  |
Future minimum payments due, three years | 1,700,000 |  |
Future minimum payments due, four years | 1,300,000 |  |
Future minimum payments due, five years and thereafter | 2,100,000 |  |
Rental expense | 3,083,000 | 3,170,000 | 2,710,000
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 78,282,000 | 76,786,000 |
Building [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 102,403,000 | 103,817,000 |
Estimated useful life, minimum | 25 |  |
Estimated useful life, maximum | 40 |  |
Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 6,919,000 | 5,512,000 |
Estimated useful life, minimum | 7 |  |
Estimated useful life, maximum | 15 |  |
Furniture, Fixtures and Equipment [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | $ 31,036,000 | $ 26,769,000 |
Estimated useful life, minimum | 2 |  |
Estimated useful life, maximum | 10 |  |

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