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Summary of Significant Accounting Policies - Premises and Equipment Estimated Useful Lives (Detail)
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12 Months Ended |
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Dec. 31, 2014
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| Leasehold Improvements [Member] | |
| Summary Of Significant Accounting Policies [Line Items] | |
| Estimated useful life | 18 years |
| Computer Equipment [Member] | |
| Summary Of Significant Accounting Policies [Line Items] | |
| Estimated useful life | 3 years |
| Minimum [Member] | Building and Improvements [Member] | |
| Summary Of Significant Accounting Policies [Line Items] | |
| Estimated useful life | 10 years |
| Minimum [Member] | Furniture and Equipment [Member] | |
| Summary Of Significant Accounting Policies [Line Items] | |
| Estimated useful life | 5 years |
| Maximum [Member] | Building and Improvements [Member] | |
| Summary Of Significant Accounting Policies [Line Items] | |
| Estimated useful life | 40 years |
| Maximum [Member] | Furniture and Equipment [Member] | |
| Summary Of Significant Accounting Policies [Line Items] | |
| Estimated useful life | 10 years |