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Loans - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2013
SecurityLoan
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Dec. 31, 2012
SecurityLoan
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Dec. 31, 2013
Minimum [Member]
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Dec. 31, 2011
Minimum [Member]
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Dec. 31, 2013
Maximum [Member]
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Dec. 31, 2011
Maximum [Member]
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| Noncancelable Obligations Future Minimum Payments Due [Line Items] |
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| Servicing loans for participants |
$ 62,800,000 |
$ 41,100,000 |
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| Company acquired loans with fair value |
345,300,000 |
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| Loans for deterioration of credit quality |
27,700,000 |
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| Nonaccretable discount |
7,600,000 |
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| No. of accruing loans |
0 |
0 |
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| Loans acquired with evidence of credit deterioration |
1,300,000 |
2,300,000 |
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| Non accrual loans acquired with evidence of credit deterioration |
1,200,000 |
3,900,000 |
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| Additional funds advanced in connection with impaired construction loans |
2,900,000 |
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| Interest on loan |
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4.50% |
1.50% |
0.46% |
2.63% |
2.46% |
| Maturity period of loan |
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30 years |
9 months |
2 years |
10 years |
16 years |
| Loans modified as TDRs on non-accrual status, minimum period |
6 months |
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| Loans modified as TDRs qualify for return to accrual status if demonstrated performance with modified terms of loan agreement, minimum period |
6 months |
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| Allocated component included in allowance for loan losses |
12,000 |
226,000 |
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| Charge-offs related to the TDRs modified |
$ 996,000 |
$ 0 |
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