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Fair Values of Assets and Liabilities - Quantitative Inputs and Assumptions Used in Level 3 Fair Value Measurements (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value |  | $ 890,198,000 | $ 886,560,000
Assets |  | $ 975,551,000 | 966,548,000
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Minimum [Member] | Discount rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | [1] | 5.50% |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Maximum [Member] | Discount rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate | [1] | 12.50% |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Minimum [Member] | Probability of default [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate |  | 0.00% |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Minimum [Member] | Prepayment rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate |  | 0.00% |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Maximum [Member] | Probability of default [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate |  | 100.00% |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Maximum [Member] | Prepayment rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate |  | 73.15% |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Weighted average [Member] | Probability of default [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate |  | 12.19% |
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Discounted Cash Flow [Member] | Weighted average [Member] | Prepayment rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate |  | 5.14% |
Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value |  | $ 2,206,000 | 2,170,000
Impaired Loans [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | $ 8,285,000 |
Impaired Loans [Member] | Discounted Cash Flow [Member] | Weighted average [Member] | Discount rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate |  |  |
Impaired Loans [Member] | Reserve Study [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets |  | $ 2,437,000 |
Impaired Loans [Member] | Reserve Study [Member] | NGL per gallon [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | [2] |  |
Impaired Loans [Member] | Reserve Study [Member] | Minimum [Member] | Gas per MCF [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | [2] | $ 1.63 |
Impaired Loans [Member] | Reserve Study [Member] | Minimum [Member] | Oil per BBL/d [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | [2] | 40.97 |
Impaired Loans [Member] | Reserve Study [Member] | Maximum [Member] | Gas per MCF [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | [2] | 3.38 |
Impaired Loans [Member] | Reserve Study [Member] | Maximum [Member] | Oil per BBL/d [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Inputs Monetary | [2] | $ 56.16 |
Impaired Loans [Member] | Reserve Study [Member] | Weighted average [Member] | Discount rates [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average rate |  | 10.00% |
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value |  | $ 35,479,000 | 37,828,000
Assets |  | 35,479,000 | 37,828,000
Level 3 [Member] | Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value |  | 2,206,000 | 2,170,000
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value |  | 33,273,000 | 35,658,000
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value |  |  | 35,658,000
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Level 3 [Member] | Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Securities available for sale, at fair value |  | 33,273,000 |
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other Real Estate Owned Assets Fair Value |  | 9,860,000 | 10,047,000
Assets |  | 58,280,000 | 53,846,000
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other Real Estate Owned Assets Fair Value |  | 8,000 | 8,000
Assets |  | 18,517,000 | $ 12,828,000
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member] | Other Real Estate Owned [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other Real Estate Owned Assets Fair Value |  | $ 8,000 |
[1] | ncorporates spread over risk free rate related primarily to credit quality and illiquidity of securities.
[2] | nobservable inputs are defined as follows: MCF - million cubic feet; BBL/d - barrels per day.

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