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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Goodwill	$ 301,368	$ 293,153
Other assets	187,193	185,826
Loans in process	1,141,018	1,149,934
Loans and Leases Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans in process	2,157,589	$ 1,992,905
Restatement Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Goodwill	7,135
Finite-lived intangible assets	5,106
Other assets	$ (12,241)

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