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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
ASSETS |  |
Securities available-for-sale, at fair value | $ 660,963,000 | $ 640,273,000
U.S. Treasury securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 14,941,000 | 14,880,000
Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 263,303,000 | 269,285,000
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 128,835,000 | 118,006,000
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 40,125,000 | 46,668,000
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 69,204,000 | 39,673,000
Obligations of states and political subdivisions |  |
ASSETS |  |
Securities available-for-sale, at fair value | 134,886,000 | 142,702,000
Marketable equity securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 9,669,000 | 9,059,000
Level 3 |  |
LIABILITIES |  |
Total Liabilities |  | 0
Fair Value Measurements, Recurring |  |
ASSETS |  |
Securities available-for-sale, at fair value | 660,963,000 | 640,273,000
Trading securities held in a Rabbi Trust | 4,021,000 | 3,456,000
Total securities | 664,984,000 | 643,729,000
Total Assets | 676,540,000 | 656,945,000
LIABILITIES |  |
Total Liabilities | 11,281,000 | 13,010,000
Fair Value Measurements, Recurring | U.S. Treasury securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 14,941,000 | 14,880,000
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 263,303,000 | 269,285,000
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 128,835,000 | 118,006,000
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 40,125,000 | 46,668,000
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 69,204,000 | 39,673,000
Fair Value Measurements, Recurring | Obligations of states and political subdivisions |  |
ASSETS |  |
Securities available-for-sale, at fair value | 134,886,000 | 142,702,000
Fair Value Measurements, Recurring | Marketable equity securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 9,669,000 | 9,059,000
Fair Value Measurements, Recurring | Interest Rate Swap |  |
ASSETS |  |
Derivative financial assets | 11,295,000 | 12,981,000
LIABILITIES |  |
Derivative financial liabilities | 11,276,000 | 12,953,000
Fair Value Measurements, Recurring | Interest Rate Lock Commitments |  |
ASSETS |  |
Derivative financial assets | 261,000 | 235,000
Fair Value Measurements, Recurring | Forward Sale Contracts |  |
LIABILITIES |  |
Derivative financial liabilities | 5,000 | 57,000
Fair Value Measurements, Recurring | Level 1 |  |
ASSETS |  |
Securities available-for-sale, at fair value |  | 178,000
Trading securities held in a Rabbi Trust | 4,021,000 | 3,456,000
Total securities | 4,021,000 | 3,634,000
Total Assets | 4,021,000 | 3,634,000
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Marketable equity securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 178,000
Fair Value Measurements, Recurring | Level 1 | Interest Rate Swap |  |
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 2 |  |
ASSETS |  |
Securities available-for-sale, at fair value | 660,963,000 | 640,095,000
Trading securities held in a Rabbi Trust | 0 | 0
Total securities | 660,963,000 | 640,095,000
Total Assets | 672,519,000 | 653,311,000
LIABILITIES |  |
Total Liabilities | 11,281,000 | 13,010,000
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 14,941,000 | 14,880,000
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 263,303,000 | 269,285,000
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 128,835,000 | 118,006,000
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 40,125,000 | 46,668,000
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 69,204,000 | 39,673,000
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions |  |
ASSETS |  |
Securities available-for-sale, at fair value | 134,886,000 | 142,702,000
Fair Value Measurements, Recurring | Level 2 | Marketable equity securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 9,669,000 | 8,881,000
Fair Value Measurements, Recurring | Level 2 | Interest Rate Swap |  |
ASSETS |  |
Derivative financial assets | 11,295,000 | 12,981,000
LIABILITIES |  |
Derivative financial liabilities | 11,276,000 | 12,953,000
Fair Value Measurements, Recurring | Level 2 | Interest Rate Lock Commitments |  |
ASSETS |  |
Derivative financial assets | 261,000 | 235,000
Fair Value Measurements, Recurring | Level 2 | Forward Sale Contracts |  |
LIABILITIES |  |
Derivative financial liabilities | 5,000 | 57,000
Fair Value Measurements, Recurring | Level 3 |  |
ASSETS |  |
Trading securities held in a Rabbi Trust | 0 | 0
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Marketable equity securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Interest Rate Swap |  |
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 |

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