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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
ASSETS |  |  |
Securities available-for-sale, at fair value | $ 698,291 |  | $ 693,487
U.S. Treasury securities |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 19,789 |  | 24,811
Obligations of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 162,193 |  | 232,179
Collateralized mortgage obligations of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 108,688 |  | 129,777
Residential mortgage-backed securities of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 32,854 |  | 37,358
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 242,221 | [1] | 125,604
Obligations of states and political subdivisions |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 127,402 |  | 132,509
Marketable equity securities |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 5,144 |  | 11,249
Fair Value Measurements, Recurring |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 698,291 |  | 693,487
Trading securities held in a Rabbi Trust | 5,080 |  | 4,410
Total securities | 703,371 |  | 697,897
Total Assets | 706,671 |  | 705,093
LIABILITIES |  |  |
Total Liabilities | 3,060 |  | 6,985
Fair Value Measurements, Recurring | Interest rate swaps |  |  |
ASSETS |  |  |
Derivative financial assets | 3,074 |  | 6,960
LIABILITIES |  |  |
Derivative financial liabilities | 3,055 |  | 6,958
Fair Value Measurements, Recurring | Interest rate lock commitments |  |  |
ASSETS |  |  |
Derivative financial assets | 226 |  | 236
Fair Value Measurements, Recurring | Forward sale contracts |  |  |
LIABILITIES |  |  |
Derivative financial liabilities | 5 |  | 27
Fair Value Measurements, Recurring | U.S. Treasury securities |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 19,789 |  | 24,811
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 162,193 |  | 232,179
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 108,688 |  | 129,777
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 32,854 |  | 37,358
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 242,221 |  | 125,604
Fair Value Measurements, Recurring | Obligations of states and political subdivisions |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 127,402 |  | 132,509
Fair Value Measurements, Recurring | Marketable equity securities |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 5,144 |  | 11,249
Fair Value Measurements, Recurring | Level 1 |  |  |
ASSETS |  |  |
Trading securities held in a Rabbi Trust | 5,080 |  | 4,410
Total securities | 5,080 |  | 4,410
Total Assets | 5,080 |  | 4,410
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 | 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 2 |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 698,291 |  | 693,487
Trading securities held in a Rabbi Trust | 0 |  | 0
Total securities | 698,291 |  | 693,487
Total Assets | 701,591 |  | 700,683
LIABILITIES |  |  |
Total Liabilities | 3,060 |  | 6,985
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps |  |  |
ASSETS |  |  |
Derivative financial assets | 3,074 |  | 6,960
LIABILITIES |  |  |
Derivative financial liabilities | 3,055 |  | 6,958
Fair Value Measurements, Recurring | Level 2 | Interest rate lock commitments |  |  |
ASSETS |  |  |
Derivative financial assets | 226 |  | 236
Fair Value Measurements, Recurring | Level 2 | Forward sale contracts |  |  |
LIABILITIES |  |  |
Derivative financial liabilities | 5 |  | 27
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 19,789 |  | 24,811
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 162,193 |  | 232,179
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 108,688 |  | 129,777
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 | 32,854 |  | 37,358
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 | 242,221 |  | 125,604
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 127,402 |  | 132,509
Fair Value Measurements, Recurring | Level 2 | Marketable equity securities |  |  |
ASSETS |  |  |
Securities available-for-sale, at fair value | 5,144 |  | 11,249
Fair Value Measurements, Recurring | Level 3 |  |  |
ASSETS |  |  |
Trading securities held in a Rabbi Trust | 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 | 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
[1] | Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.

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