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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers between Level 1 to Level 2 | $ 0 | $ 0
ASSETS |  |
Total securities available-for-sale | 689,388,000 | 693,487,000
U.S. treasury securities |  |
ASSETS |  |
Total securities available-for-sale | 24,886,000 | 24,811,000
Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 211,434,000 | 232,179,000
Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 120,203,000 | 129,777,000
Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 34,611,000 | 37,358,000
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 162,413,000 | 125,604,000
Obligations of states and political subdivisions |  |
ASSETS |  |
Total securities available-for-sale | 131,106,000 | 132,509,000
Marketable equity securities |  |
ASSETS |  |
Total securities available-for-sale | 4,735,000 | 11,249,000
Fair Value Measurements, Recurring |  |
ASSETS |  |
Total securities available-for-sale | 689,388,000 | 693,487,000
Trading securities held in a Rabbi Trust | 4,790,000 | 4,410,000
Total securities | 694,178,000 | 697,897,000
Total Assets | 700,090,000 | 705,093,000
LIABILITIES |  |
Total Liabilities | 5,423,000 | 6,985,000
Fair Value Measurements, Recurring | Interest rate swap contracts - commercial loans |  |
ASSETS |  |
Derivative financial assets | 5,442,000 | 6,960,000
LIABILITIES |  |
Derivative financial liabilities | 5,423,000 | 6,958,000
Fair Value Measurements, Recurring | Interest rate lock commitments - mortgage loans |  |
ASSETS |  |
Derivative financial assets | 456,000 | 236,000
Fair Value Measurements, Recurring | Forward sale contracts - mortgage loans |  |
ASSETS |  |
Derivative financial assets | 14,000 |
LIABILITIES |  |
Derivative financial liabilities |  | 27,000
Fair Value Measurements, Recurring | U.S. treasury securities |  |
ASSETS |  |
Total securities available-for-sale | 24,886,000 | 24,811,000
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 211,434,000 | 232,179,000
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 120,203,000 | 129,777,000
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 34,611,000 | 37,358,000
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 162,413,000 | 125,604,000
Fair Value Measurements, Recurring | Obligations of states and political subdivisions |  |
ASSETS |  |
Total securities available-for-sale | 131,106,000 | 132,509,000
Fair Value Measurements, Recurring | Marketable equity securities |  |
ASSETS |  |
Total securities available-for-sale | 4,735,000 | 11,249,000
Fair Value Measurements, Recurring | Level 1 |  |
ASSETS |  |
Total securities available-for-sale | 0 | 0
Trading securities held in a Rabbi Trust | 4,790,000 | 4,410,000
Total securities | 4,790,000 | 4,410,000
Total Assets | 4,790,000 | 4,410,000
LIABILITIES |  |
Total Liabilities | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Interest rate swap contracts - commercial loans |  |
ASSETS |  |
Derivative financial assets | 0 | 0
LIABILITIES |  |
Derivative financial liabilities | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Interest rate lock commitments - mortgage loans |  |
ASSETS |  |
Derivative financial assets | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Forward sale contracts - mortgage loans |  |
ASSETS |  |
Derivative financial assets | 0 |
LIABILITIES |  |
Derivative financial liabilities |  | 0
Fair Value Measurements, Recurring | Level 1 | U.S. 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 | 689,388,000 | 693,487,000
Trading securities held in a Rabbi Trust | 0 | 0
Total securities | 689,388,000 | 693,487,000
Total Assets | 695,300,000 | 700,683,000
LIABILITIES |  |
Total Liabilities | 5,423,000 | 6,985,000
Fair Value Measurements, Recurring | Level 2 | Interest rate swap contracts - commercial loans |  |
ASSETS |  |
Derivative financial assets | 5,442,000 | 6,960,000
LIABILITIES |  |
Derivative financial liabilities | 5,423,000 | 6,958,000
Fair Value Measurements, Recurring | Level 2 | Interest rate lock commitments - mortgage loans |  |
ASSETS |  |
Derivative financial assets | 456,000 | 236,000
Fair Value Measurements, Recurring | Level 2 | Forward sale contracts - mortgage loans |  |
ASSETS |  |
Derivative financial assets | 14,000 |
LIABILITIES |  |
Derivative financial liabilities |  | 27,000
Fair Value Measurements, Recurring | Level 2 | U.S. treasury securities |  |
ASSETS |  |
Total securities available-for-sale | 24,886,000 | 24,811,000
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 211,434,000 | 232,179,000
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 120,203,000 | 129,777,000
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 34,611,000 | 37,358,000
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |
ASSETS |  |
Total securities available-for-sale | 162,413,000 | 125,604,000
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions |  |
ASSETS |  |
Total securities available-for-sale | 131,106,000 | 132,509,000
Fair Value Measurements, Recurring | Level 2 | Marketable equity securities |  |
ASSETS |  |
Total securities available-for-sale | 4,735,000 | 11,249,000
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 swap contracts - commercial loans |  |
ASSETS |  |
Derivative financial assets | 0 | 0
LIABILITIES |  |
Derivative financial liabilities | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Interest rate lock commitments - mortgage loans |  |
ASSETS |  |
Derivative financial assets | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Forward sale contracts - mortgage loans |  |
ASSETS |  |
Derivative financial assets | 0 |
LIABILITIES |  |
Derivative financial liabilities |  | 0
Fair Value Measurements, Recurring | Level 3 | U.S. 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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