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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities Available For Sale: |  |
Securities available for sale | $ 418,299 | $ 409,709
Trading Securities: |  |
Trading securities | 7,256 | 7,150
Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 170 | 220
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 943 | 962
Interest rate swaps | 0 | 0
Trading Securities: |  |
Trading securities | 7,204 | 7,098
Liabilities |  |
Interest rate swaps | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 417,356 | 408,747
Interest rate swaps | 146 | 149
Trading Securities: |  |
Trading securities | 52 | 52
Liabilities |  |
Interest rate swaps | (229) | (310)
Significant Unobservable Inputs (Level 3) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Interest rate swaps | 0 | 0
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 | 418,299 | 409,709
Interest rate swaps | 146 | 149
Trading Securities: |  |
Trading securities | 7,256 | 7,150
Liabilities |  |
Interest rate swaps | (229) | (310)
Fair Value Measurement on Recurring Basis [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 111,921 | 108,148
Trading Securities: |  |
Trading securities | 52 | 52
Fair Value Measurement on Recurring Basis [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 133,466 | 137,723
Fair Value Measurement on Recurring Basis [Member] | Residential and Multi-Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 120,630 | 109,636
Fair Value Measurement on Recurring Basis [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 17,194 | 17,200
Trading Securities: |  |
Trading securities | 250 | 254
Fair Value Measurement on Recurring Basis [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 34,145 | 36,040
Fair Value Measurement on Recurring Basis [Member] | Other [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 943 | 962
Fair Value Measurement on Recurring Basis [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 5,172 | 5,125
Fair Value Measurement on Recurring Basis [Member] | Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 1,612 | 1,499
Fair Value Measurement on Recurring Basis [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 170 | 220
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 | 943 | 962
Interest rate swaps | 0 | 0
Trading Securities: |  |
Trading securities | 7,204 | 7,098
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 | 250 | 254
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 [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 943 | 962
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 | 5,172 | 5,125
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 | 1,612 | 1,499
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 | 170 | 220
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 417,356 | 408,747
Interest rate swaps | 146 | 149
Trading Securities: |  |
Trading securities | 52 | 52
Liabilities |  |
Interest rate swaps | (229) | (310)
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 | 111,921 | 108,148
Trading Securities: |  |
Trading securities | 52 | 52
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 | 133,466 | 137,723
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 | 120,630 | 109,636
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 | 17,194 | 17,200
Trading Securities: |  |
Trading securities | 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 | 34,145 | 36,040
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other [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 | 0 | 0
Interest rate swaps | 0 | 0
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 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 [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 | 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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