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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Securities Available For Sale: |  |
Securities available for sale | $ 587,333 | $ 685,720
Trading Securities: |  |
Trading securities | 4,489 | 4,505
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 993 | 1,002
Trading Securities: |  |
Trading securities | 4,279 | 4,296
Liabilities, |  |
Interest rate swaps | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 585,180 | 683,813
Trading Securities: |  |
Trading securities | 210 | 209
Liabilities, |  |
Interest rate swaps | (908) | (946)
Significant Unobservable Inputs (Level 3) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 1,160 | 905
Trading Securities: |  |
Trading securities | 0 | 0
Liabilities, |  |
Interest rate swaps | 0 | 0
Fair Value Measurement on Recurring Basis [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 587,333 | 685,720
Trading Securities: |  |
Trading securities | 4,489 | 4,505
Liabilities, |  |
Interest rate swaps | (908) | (946)
Fair Value Measurement on Recurring Basis [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 147,009 | 155,564
Trading Securities: |  |
Trading securities | 55 | 54
Fair Value Measurement on Recurring Basis [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 180,429 | 181,002
Fair Value Measurement on Recurring Basis [Member] | Residential and Multi-Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 184,347 | 265,164
Fair Value Measurement on Recurring Basis [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 19,036 | 19,430
Trading Securities: |  |
Trading securities | 155 | 157
Fair Value Measurement on Recurring Basis [Member] | Pooled Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 1,160 | 905
Fair Value Measurement on Recurring Basis [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 54,359 | 62,653
Fair Value Measurement on Recurring Basis [Member] | Other Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 993 | 1,002
Fair Value Measurement on Recurring Basis [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 2,997 | 3,044
Fair Value Measurement on Recurring Basis [Member] | Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 1,028 | 997
Fair Value Measurement on Recurring Basis [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 254 | 253
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 993 | 1,002
Trading Securities: |  |
Trading securities | 4,279 | 4,294
Liabilities, |  |
Interest rate swaps | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential and Multi-Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pooled Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 993 | 1,002
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 2,997 | 3,044
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 1,028 | 997
Fair Value Measurement on Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 254 | 253
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 585,180 | 683,813
Trading Securities: |  |
Trading securities | 210 | 211
Liabilities, |  |
Interest rate swaps | (908) | (946)
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 147,009 | 155,564
Trading Securities: |  |
Trading securities | 55 | 54
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 180,429 | 181,002
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Residential and Multi-Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 184,347 | 265,164
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 19,036 | 19,430
Trading Securities: |  |
Trading securities | 155 | 157
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pooled Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 54,359 | 62,653
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 1,160 | 905
Trading Securities: |  |
Trading securities | 0 | 0
Liabilities, |  |
Interest rate swaps | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Residential and Multi-Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pooled Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 1,160 | 905
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 0 |
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | $ 0 | $ 0

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