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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
ASSETS |  |
Securities available-for-sale, at fair value | $ 693,487 | $ 660,963
U.S. Treasury securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 24,811 | 14,941
Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 232,179 | 263,303
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 129,777 | 128,835
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 37,358 | 40,125
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 125,604 | 69,204
Obligations of states and political subdivisions |  |
ASSETS |  |
Securities available-for-sale, at fair value | 132,509 | 134,886
Marketable equity securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 11,249 | 9,669
Fair Value Measurements, Recurring |  |
ASSETS |  |
Securities available-for-sale, at fair value | 693,487 | 660,963
Trading securities held in a Rabbi Trust | 4,410 | 4,021
Total securities | 697,897 | 664,984
Total Assets | 705,093 | 676,540
LIABILITIES |  |
Total Liabilities | 6,985 | 11,281
Fair Value Measurements, Recurring | U.S. Treasury securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 24,811 | 14,941
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 232,179 | 263,303
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 129,777 | 128,835
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 37,358 | 40,125
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 125,604 | 69,204
Fair Value Measurements, Recurring | Obligations of states and political subdivisions |  |
ASSETS |  |
Securities available-for-sale, at fair value | 132,509 | 134,886
Fair Value Measurements, Recurring | Marketable equity securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 11,249 | 9,669
Fair Value Measurements, Recurring | Interest Rate Swap |  |
ASSETS |  |
Derivative financial assets | 6,960 | 11,295
LIABILITIES |  |
Derivative financial liabilities | 6,958 | 11,276
Fair Value Measurements, Recurring | Interest Rate Lock Commitments |  |
ASSETS |  |
Derivative financial assets | 236 | 261
Fair Value Measurements, Recurring | Forward Sale Contracts |  |
LIABILITIES |  |
Derivative financial liabilities | 27 | 5
Fair Value Measurements, Recurring | Level 1 |  |
ASSETS |  |
Securities available-for-sale, at fair value |  |
Trading securities held in a Rabbi Trust | 4,410 | 4,021
Total securities | 4,410 | 4,021
Total Assets | 4,410 | 4,021
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 | 0
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 | 693,487 | 660,963
Trading securities held in a Rabbi Trust | 0 | 0
Total securities | 693,487 | 660,963
Total Assets | 700,683 | 672,519
LIABILITIES |  |
Total Liabilities | 6,985 | 11,281
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 24,811 | 14,941
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 232,179 | 263,303
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Securities available-for-sale, at fair value | 129,777 | 128,835
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 | 37,358 | 40,125
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 | 125,604 | 69,204
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions |  |
ASSETS |  |
Securities available-for-sale, at fair value | 132,509 | 134,886
Fair Value Measurements, Recurring | Level 2 | Marketable equity securities |  |
ASSETS |  |
Securities available-for-sale, at fair value | 11,249 | 9,669
Fair Value Measurements, Recurring | Level 2 | Interest Rate Swap |  |
ASSETS |  |
Derivative financial assets | 6,960 | 11,295
LIABILITIES |  |
Derivative financial liabilities | 6,958 | 11,276
Fair Value Measurements, Recurring | Level 2 | Interest Rate Lock Commitments |  |
ASSETS |  |
Derivative financial assets | 236 | 261
Fair Value Measurements, Recurring | Level 2 | Forward Sale Contracts |  |
LIABILITIES |  |
Derivative financial liabilities | 27 | 5
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 | $ 0

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