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Fair Value - Undesignated Derivative Instruments (Detail) - Mortgage Banking [Member] - Level 2 [Member] - Fair Value, Measurements, Recurring [Member] $ in Thousands | Sep. 30, 2015 USD ($)
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Rate Lock Commitments [Member] |
Derivatives Fair Value [Line Items] |
Gross assets | $ 11,282
Gross liabilities | 1,532
Net rate lock commitments | 9,750
Forward Sales Contracts [Member] |
Derivatives Fair Value [Line Items] |
Gross assets | 12
Gross liabilities | 4,713
Net forward sales contracts | $ 4,701

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