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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Securities Available For Sale: |  |
Securities available for sale | $ 450,895 | $ 409,709
Fair Value Measurement on Recurring Basis |  |
Securities Available For Sale: |  |
Securities available for sale | 450,895 | 409,709
Interest Rate swaps | 153 | 149
Trading Securities: |  |
Trading securities | 7,545 | 7,150
LIABILITIES |  |
Interest rate swaps | (189) | (310)
Fair Value Measurement on Recurring Basis | U.S. Government sponsored entities |  |
Securities Available For Sale: |  |
Securities available for sale | 124,432 | 108,148
Trading Securities: |  |
Trading securities | 51 | 52
Fair Value Measurement on Recurring Basis | States and political subdivisions |  |
Securities Available For Sale: |  |
Securities available for sale | 134,267 | 137,723
Fair Value Measurement on Recurring Basis | Residential and multi-family mortgage |  |
Securities Available For Sale: |  |
Securities available for sale | 146,467 | 109,636
Fair Value Measurement on Recurring Basis | Corporate notes and bonds |  |
Securities Available For Sale: |  |
Securities available for sale | 12,855 | 17,200
Trading Securities: |  |
Trading securities | 248 | 254
Fair Value Measurement on Recurring Basis | Pooled SBA |  |
Securities Available For Sale: |  |
Securities available for sale | 31,939 | 36,040
Fair Value Measurement on Recurring Basis | Other |  |
Securities Available For Sale: |  |
Securities available for sale | 935 | 962
Fair Value Measurement on Recurring Basis | Corporate equity securities |  |
Trading Securities: |  |
Trading securities | 5,398 | 5,125
Fair Value Measurement on Recurring Basis | Mutual funds |  |
Trading Securities: |  |
Trading securities | 1,626 | 1,499
Fair Value Measurement on Recurring Basis | Certificates of deposit |  |
Trading Securities: |  |
Trading securities | 222 | 220
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Securities Available For Sale: |  |
Securities available for sale | 935 | 962
Interest Rate swaps | 0 | 0
Trading Securities: |  |
Trading securities | 7,494 | 7,098
LIABILITIES |  |
Interest rate swaps | 0 | 0
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government sponsored entities |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | States and political subdivisions |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential and multi-family mortgage |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate notes and bonds |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 248 | 254
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Pooled SBA |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other |  |
Securities Available For Sale: |  |
Securities available for sale | 935 | 962
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate equity securities |  |
Trading Securities: |  |
Trading securities | 5,398 | 5,125
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds |  |
Trading Securities: |  |
Trading securities | 1,626 | 1,499
Fair Value Measurement on Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit |  |
Trading Securities: |  |
Trading securities | 222 | 220
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) |  |
Securities Available For Sale: |  |
Securities available for sale | 449,960 | 408,747
Interest Rate swaps | 153 | 149
Trading Securities: |  |
Trading securities | 51 | 52
LIABILITIES |  |
Interest rate swaps | (189) | (310)
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) | U.S. Government sponsored entities |  |
Securities Available For Sale: |  |
Securities available for sale | 124,432 | 108,148
Trading Securities: |  |
Trading securities | 51 | 52
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) | States and political subdivisions |  |
Securities Available For Sale: |  |
Securities available for sale | 134,267 | 137,723
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) | Residential and multi-family mortgage |  |
Securities Available For Sale: |  |
Securities available for sale | 146,467 | 109,636
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate notes and bonds |  |
Securities Available For Sale: |  |
Securities available for sale | 12,855 | 17,200
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) | Pooled SBA |  |
Securities Available For Sale: |  |
Securities available for sale | 31,939 | 36,040
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) | Other |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) | Corporate equity securities |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) | Mutual funds |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Other Observable Inputs (Level 2) | Certificates of deposit |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3) |  |
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 | Significant Unobservable Inputs (Level 3) | U.S. Government sponsored entities |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3) | States and political subdivisions |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3) | Residential and multi-family mortgage |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3) | Corporate notes and bonds |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3) | Pooled SBA |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3) | Other |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3) | Corporate equity securities |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3) | Mutual funds |  |
Trading Securities: |  |
Trading securities | 0 | 0
Fair Value Measurement on Recurring Basis | Significant Unobservable Inputs (Level 3) | Certificates of deposit |  |
Trading Securities: |  |
Trading securities | $ 0 | $ 0

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