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Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | $ 351,693 | $ 519,820 |
Derivatives assets | 7 | 84 | 19
Derivative Liabilities | 196 | 41 | 19
Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 351,693 | 519,820 |
Fair value loans | 7,849 |  |
Deferred compensation assets | 3,266 | 4,200 |
Derivatives assets | 7 | 84 |
Deferred compensation liabilities | 3,266 | 4,200 |
Derivative Liabilities | 196 | 41 |
Recurring | US Treasury Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 9,478 | 9,013 |
Recurring | Municipal securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 141,062 | 144,280 |
Recurring | Single Issue Trust Preferred Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 48,682 | 46,234 |
Recurring | Corporate securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 5,048 | 4,871 |
Recurring | Agency Mortgage Backed Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 137,519 | 300,386 |
Recurring | Non Agency Alt Residential Mbs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 9,662 |  |
Recurring | Equity Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 242 | 5,247 |
Recurring | Forward Sale Loan Commitments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives assets | 7 | 41 |
Recurring | Non Agency Residential Mortgage Backed Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities |  | 9,789 |
Interest Rate Swaps Agreement | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives assets |  | 43 |
Derivative Liabilities | 189 |  |
IRLCs | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liabilities | 7 | 41 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 224 | 251 |
Level 1 | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 224 | 251 |
Deferred compensation assets | 3,266 | 4,200 |
Deferred compensation liabilities | 3,266 | 4,200 |
Level 1 | Recurring | Equity Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 224 | 251 |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 351,469 | 519,569 |
Fair value loans | 7,849 |  |
Derivatives assets | 7 | 84 |
Derivative Liabilities | 196 | 41 |
Level 2 | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 351,469 | 519,569 |
Fair value loans | 7,849 |  |
Derivatives assets | 7 | 84 |
Derivative Liabilities | 196 | 41 |
Level 2 | Recurring | US Treasury Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 9,478 | 9,013 |
Level 2 | Recurring | Municipal securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 141,062 | 144,280 |
Level 2 | Recurring | Single Issue Trust Preferred Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 48,682 | 46,234 |
Level 2 | Recurring | Corporate securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 5,048 | 4,871 |
Level 2 | Recurring | Agency Mortgage Backed Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 137,519 | 300,386 |
Level 2 | Recurring | Non Agency Alt Residential Mbs |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 9,662 |  |
Level 2 | Recurring | Equity Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities | 18 | 4,996 |
Level 2 | Recurring | Forward Sale Loan Commitments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives assets | 7 | 41 |
Level 2 | Recurring | Non Agency Residential Mortgage Backed Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total available-for-sale securities |  | 9,789 |
Level 2 | Interest Rate Swaps Agreement | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives assets |  | 43 |
Derivative Liabilities | 189 |  |
Level 2 | IRLCs | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Liabilities | $ 7 | $ 41 |

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