Allowance for Loan Losses - Additional Information (Detail) |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2015
USD ($)
Category
|
Dec. 31, 2014
USD ($)
|
Dec. 31, 2013
USD ($)
|
|
| Financing Receivable, Recorded Investment, Past Due [Line Items] | |||
| Number of categories occupied under commercial real estate loans | Category | 2 | ||
| Originated Loans [Member] | |||
| Financing Receivable, Recorded Investment, Past Due [Line Items] | |||
| Impaired TDRs Loans | $ 29,269,000 | $ 45,676,000 | $ 56,739,000 |
| Additional funds in TDRs | 35,000 | 54,000 | 25,000 |
| PNCI Loans [Member] | |||
| Financing Receivable, Recorded Investment, Past Due [Line Items] | |||
| Impaired TDRs Loans | 1,396,000 | 1,307,000 | 901,000 |
| Obligations to lend additional funds on TDRs | $ 0 | $ 0 | $ 0 |
| Minimum [Member] | |||
| Financing Receivable, Recorded Investment, Past Due [Line Items] | |||
| Period of collateral payment of loan | 3 months | ||
| Maximum [Member] | |||
| Financing Receivable, Recorded Investment, Past Due [Line Items] | |||
| Period of collateral payment of loan | 12 months |