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Premises and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | $ 416,920 | $ 390,291 |
Less accumulated depreciation and amortization | (148,925) | (126,597) |
Premises and equipment, net | 267,995 | 263,694 |
Future minimum payments due, 2019 | 5,582 |  |
Future minimum payments due, 2020 | 5,316 |  |
Future minimum payments due, 2021 | 4,758 |  |
Future minimum payments due, 2022 | 4,172 |  |
Future minimum payments due, 2023 | 3,689 |  |
Future minimum payments due, thereafter | 13,778 |  |
Rental expense | 6,477 | 5,500 | $ 5,346
Land |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 110,251 | 102,381 |
Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 156,803 | 149,805 |
Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | 22,887 | 18,587 |
Furniture, software and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Premises and equipment, gross | $ 126,979 | $ 119,518 |
Minimum | Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 25 years |  |
Minimum | Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 7 years |  |
Minimum | Furniture, software and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 2 years |  |
Maximum | Buildings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 40 years |  |
Maximum | Leasehold improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 15 years |  |
Maximum | Furniture, software and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated Useful Life | 10 years |  |

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