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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities Available For Sale: |  |
Securities available for sale | $ 409,709 | $ 495,835
Trading Securities: |  |
Trading securities | 7,150 | 4,858
Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 220 | 202
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 962 | 971
Interest rate swaps | 0 | 0
Trading Securities: |  |
Trading securities | 7,098 | 4,805
Liabilities |  |
Interest rate swaps | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 408,747 | 492,815
Interest rate swaps | 149 | 211
Trading Securities: |  |
Trading securities | 52 | 53
Liabilities |  |
Interest rate swaps | (310) | (670)
Significant Unobservable Inputs (Level 3) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 0 | 2,049
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 | 409,709 | 495,835
Interest rate swaps | 149 | 211
Trading Securities: |  |
Trading securities | 7,150 | 4,858
Liabilities |  |
Interest rate swaps | (310) | (670)
Fair Value Measurement on Recurring Basis [Member] | U.S. Government Sponsored Entities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 108,148 | 140,351
Trading Securities: |  |
Trading securities | 52 | 53
Fair Value Measurement on Recurring Basis [Member] | States and Political Subdivisions [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 137,723 | 157,037
Fair Value Measurement on Recurring Basis [Member] | Residential and Multi-Family Mortgage [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 109,636 | 134,976
Fair Value Measurement on Recurring Basis [Member] | Corporate Notes and Bonds [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 17,200 | 17,414
Trading Securities: |  |
Trading securities | 254 | 254
Fair Value Measurement on Recurring Basis [Member] | Pooled Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale |  | 2,049
Fair Value Measurement on Recurring Basis [Member] | Pooled SBA [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 36,040 | 43,037
Fair Value Measurement on Recurring Basis [Member] | Other Equity Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 962 | 971
Fair Value Measurement on Recurring Basis [Member] | Corporate Equity Securities [Member] |  |
Trading Securities: |  |
Trading securities | 5,125 | 3,312
Fair Value Measurement on Recurring Basis [Member] | Mutual Funds [Member] |  |
Trading Securities: |  |
Trading securities | 1,499 | 1,037
Fair Value Measurement on Recurring Basis [Member] | Certificates of Deposit [Member] |  |
Trading Securities: |  |
Trading securities | 220 | 202
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 | 962 | 971
Interest rate swaps | 0 | 0
Trading Securities: |  |
Trading securities | 7,098 | 4,805
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 | 254 | 254
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
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 Equity Securities [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 962 | 971
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 | 5,125 | 3,312
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 | 1,499 | 1,037
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 | 220 | 202
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Securities Available For Sale: |  |
Securities available for sale | 408,747 | 492,815
Interest rate swaps | 149 | 211
Trading Securities: |  |
Trading securities | 52 | 53
Liabilities |  |
Interest rate swaps | (310) | (670)
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 | 108,148 | 140,351
Trading Securities: |  |
Trading securities | 52 | 53
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 | 137,723 | 157,037
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 | 109,636 | 134,976
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 | 17,200 | 17,414
Trading Securities: |  |
Trading securities | 0 | 0
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
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 | 36,040 | 43,037
Fair Value Measurement on Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Equity 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 | 0 | 2,049
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 Trust Preferred [Member] |  |
Securities Available For Sale: |  |
Securities available for sale |  | 2,049
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 Equity 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 | 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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