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Premises and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | $ 386,819 | $ 361,216 |
Less accumulated depreciation and amortization | (104,868) | (84,969) |
Premises and equipment, net | 281,951 | 276,247 |
Future minimum payments due, current | 4,902 |  |
Future minimum payments due, two years | 3,942 |  |
Future minimum payments due, three years | 3,422 |  |
Future minimum payments due, four years | 3,228 |  |
Future minimum payments due, five years | 2,538 |  |
Future minimum payments due, thereafter | 13,159 |  |
Rental expense | 5,300 | 6,600 | $ 6,600
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 109,414 | 113,347 |
Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 143,841 | 147,757 |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 18,365 | 10,193 |
Furniture, fixtures and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | $ 115,199 | $ 89,919 |
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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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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