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Federal Home Loan Bank Advances and Borrowings - Additional Information (Detail) (USD $)
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Dec. 31, 2014
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Dec. 31, 2013
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| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] | ||
| Pledged under blanket floating liens | $ 471,481,000 | $ 409,911,000 |
| Federal Home Loan Bank Advances [Member] | ||
| Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] | ||
| Outstanding unfunded standby letters of credit | 98,345,000 | |
| Additional borrowing capacity under its borrowing arrangement with the FHLB | 111,032,000 | |
| Available lines of credit for overnight borrowings | $ 84,600,000 |