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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers between Level 1 to Level 2 | $ 0 |
ASSETS |  |
Total securities available-for-sale | 671,128,000 | $ 660,963,000
US Treasury Securities |  |
ASSETS |  |
Total securities available-for-sale | 15,056,000 | 14,941,000
Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 250,924,000 | 263,303,000
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 137,460,000 | 128,835,000
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 36,285,000 | 40,125,000
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 88,499,000 | 69,204,000
Obligations of States and Political Subdivisions |  |
ASSETS |  |
Total securities available-for-sale | 132,536,000 | 134,886,000
Marketable Equity Securities |  |
ASSETS |  |
Total securities available-for-sale | 10,368,000 | 9,669,000
Fair Value Measurements, Recurring |  |
ASSETS |  |
Total securities available-for-sale | 671,128,000 | 660,963,000
Trading securities held in a Rabbi Trust | 4,312,000 | 4,021,000
Total securities | 675,440,000 | 664,984,000
Total Assets | 691,434,000 | 676,540,000
LIABILITIES |  |
Total Liabilities | 15,300,000 | 11,281,000
Fair Value Measurements, Recurring | Interest Rate Swaps |  |
ASSETS |  |
Derivative financial assets | 15,255,000 | 11,295,000
LIABILITIES |  |
Derivative financial liabilities | 15,202,000 | 11,276,000
Fair Value Measurements, Recurring | Interest Rate Lock Commitments |  |
ASSETS |  |
Derivative financial assets | 739,000 | 261,000
Fair Value Measurements, Recurring | Forward Sale Contracts |  |
LIABILITIES |  |
Derivative financial liabilities | 98,000 | 5,000
Fair Value Measurements, Recurring | US Treasury Securities |  |
ASSETS |  |
Total securities available-for-sale | 15,056,000 | 14,941,000
Fair Value Measurements, Recurring | Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 250,924,000 | 263,303,000
Fair Value Measurements, Recurring | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 137,460,000 | 128,835,000
Fair Value Measurements, Recurring | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 36,285,000 | 40,125,000
Fair Value Measurements, Recurring | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 88,499,000 | 69,204,000
Fair Value Measurements, Recurring | Obligations of States and Political Subdivisions |  |
ASSETS |  |
Total securities available-for-sale | 132,536,000 | 134,886,000
Fair Value Measurements, Recurring | Marketable Equity Securities |  |
ASSETS |  |
Total securities available-for-sale | 10,368,000 | 9,669,000
Fair Value Measurements, Recurring | Level 1 |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Trading securities held in a Rabbi Trust | 4,312,000 | 4,021,000
Total securities | 4,312,000 | 4,021,000
Total Assets | 4,312,000 | 4,021,000
LIABILITIES |  |
Total Liabilities | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Interest Rate Swaps |  |
ASSETS |  |
Derivative financial assets | 0 | 0
LIABILITIES |  |
Derivative financial liabilities | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Interest Rate Lock Commitments |  |
ASSETS |  |
Derivative financial assets | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Forward Sale Contracts |  |
LIABILITIES |  |
Derivative financial liabilities | 0 | 0
Fair Value Measurements, Recurring | Level 1 | US Treasury Securities |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Obligations of States and Political Subdivisions |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Marketable Equity Securities |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 2 |  |
ASSETS |  |
Total securities available-for-sale | 671,128,000 | 660,963,000
Trading securities held in a Rabbi Trust | 0 | 0
Total securities | 671,128,000 | 660,963,000
Total Assets | 687,122,000 | 672,519,000
LIABILITIES |  |
Total Liabilities | 15,300,000 | 11,281,000
Fair Value Measurements, Recurring | Level 2 | Interest Rate Swaps |  |
ASSETS |  |
Derivative financial assets | 15,255,000 | 11,295,000
LIABILITIES |  |
Derivative financial liabilities | 15,202,000 | 11,276,000
Fair Value Measurements, Recurring | Level 2 | Interest Rate Lock Commitments |  |
ASSETS |  |
Derivative financial assets | 739,000 | 261,000
Fair Value Measurements, Recurring | Level 2 | Forward Sale Contracts |  |
LIABILITIES |  |
Derivative financial liabilities | 98,000 | 5,000
Fair Value Measurements, Recurring | Level 2 | US Treasury Securities |  |
ASSETS |  |
Total securities available-for-sale | 15,056,000 | 14,941,000
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 250,924,000 | 263,303,000
Fair Value Measurements, Recurring | Level 2 | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 137,460,000 | 128,835,000
Fair Value Measurements, Recurring | Level 2 | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 36,285,000 | 40,125,000
Fair Value Measurements, Recurring | Level 2 | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 88,499,000 | 69,204,000
Fair Value Measurements, Recurring | Level 2 | Obligations of States and Political Subdivisions |  |
ASSETS |  |
Total securities available-for-sale | 132,536,000 | 134,886,000
Fair Value Measurements, Recurring | Level 2 | Marketable Equity Securities |  |
ASSETS |  |
Total securities available-for-sale | 10,368,000 | 9,669,000
Fair Value Measurements, Recurring | Level 3 |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Trading securities held in a Rabbi Trust | 0 | 0
Total securities | 0 | 0
Total Assets | 0 | 0
LIABILITIES |  |
Total Liabilities | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Interest Rate Swaps |  |
ASSETS |  |
Derivative financial assets | 0 | 0
LIABILITIES |  |
Derivative financial liabilities | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Interest Rate Lock Commitments |  |
ASSETS |  |
Derivative financial assets | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Forward Sale Contracts |  |
LIABILITIES |  |
Derivative financial liabilities | 0 | 0
Fair Value Measurements, Recurring | Level 3 | US Treasury Securities |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Obligations of States and Political Subdivisions |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Marketable Equity Securities |  |
ASSETS |  |
Total securities available-for-sale | $ 0 | $ 0

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