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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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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 |  |  |  |
Debt securities available-for-sale |  | 677,221,000 | 693,147,000 |
Marketable equity securities |  | 5,314,000 | 5,144,000 |
U.S. Treasury securities |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 9,556,000 | 19,789,000 |
Obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 136,984,000 | 162,193,000 |
Collateralized mortgage obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 137,660,000 | 108,688,000 |
Residential mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 26,450,000 | 32,854,000 |
Commercial mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 244,596,000 | 242,221,000 | [1]
Obligations of states and political subdivisions |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 121,975,000 | 127,402,000 |
Fair Value Measurements, Recurring |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 677,221,000 | 693,147,000 |
Marketable equity securities | [2] | 5,314,000 | 5,144,000 |
Total securities |  | 682,535,000 | 698,291,000 |
Trading securities held in a Rabbi Trust |  | 5,377,000 | 5,080,000 |
Total Assets |  | 695,650,000 | 706,671,000 |
LIABILITIES |  |  |  |
Total Liabilities |  | 7,483,000 | 3,060,000 |
Fair Value Measurements, Recurring | U.S. Treasury securities |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 9,556,000 | 19,789,000 |
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 136,984,000 | 162,193,000 |
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 137,660,000 | 108,688,000 |
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 26,450,000 | 32,854,000 |
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 244,596,000 | 242,221,000 |
Fair Value Measurements, Recurring | Obligations of states and political subdivisions |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 121,975,000 | 127,402,000 |
Fair Value Measurements, Recurring | Interest rate swaps |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 7,448,000 | 3,074,000 |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | 7,483,000 | 3,055,000 |
Fair Value Measurements, Recurring | Interest rate lock commitments |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 229,000 | 226,000 |
Fair Value Measurements, Recurring | Forward sale contracts—mortgage loans |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 61,000 |  |
LIABILITIES |  |  |  |
Derivative financial liabilities |  |  | 5,000 |
Fair Value Measurements, Recurring | Level 1 |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Marketable equity securities | [2] | 0 | 0 |
Total securities |  | 0 | 0 |
Trading securities held in a Rabbi Trust |  | 5,377,000 | 5,080,000 |
Total Assets |  | 5,377,000 | 5,080,000 |
LIABILITIES |  |  |  |
Total Liabilities |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 1 | U.S. Treasury securities |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 1 | Collateralized mortgage obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 1 | Residential mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 1 | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 1 | Obligations of states and political subdivisions |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 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—mortgage loans |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 0 |  |
LIABILITIES |  |  |  |
Derivative financial liabilities |  |  | 0 |
Fair Value Measurements, Recurring | Level 2 |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 677,221,000 | 693,147,000 |
Marketable equity securities | [2] | 5,314,000 | 5,144,000 |
Total securities |  | 682,535,000 | 698,291,000 |
Trading securities held in a Rabbi Trust |  | 0 | 0 |
Total Assets |  | 690,273,000 | 701,591,000 |
LIABILITIES |  |  |  |
Total Liabilities |  | 7,483,000 | 3,060,000 |
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 9,556,000 | 19,789,000 |
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 136,984,000 | 162,193,000 |
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 137,660,000 | 108,688,000 |
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 26,450,000 | 32,854,000 |
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 244,596,000 | 242,221,000 |
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 121,975,000 | 127,402,000 |
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 7,448,000 | 3,074,000 |
LIABILITIES |  |  |  |
Derivative financial liabilities |  | 7,483,000 | 3,055,000 |
Fair Value Measurements, Recurring | Level 2 | Interest rate lock commitments |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 229,000 | 226,000 |
Fair Value Measurements, Recurring | Level 2 | Forward sale contracts—mortgage loans |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | 61,000 |  |
LIABILITIES |  |  |  |
Derivative financial liabilities |  |  | 5,000 |
Fair Value Measurements, Recurring | Level 3 |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Marketable equity securities | [2] | 0 | 0 |
Total securities |  | 0 | 0 |
Trading securities held in a Rabbi Trust |  | 0 | 0 |
Total Assets |  | 0 | 0 |
LIABILITIES |  |  |  |
Total Liabilities |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | U.S. Treasury securities |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | Collateralized mortgage obligations of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | Residential mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | Commercial mortgage-backed securities of U.S. government corporations and agencies |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 0 | 0 |
Fair Value Measurements, Recurring | Level 3 | Obligations of states and political subdivisions |  |  |  |
ASSETS |  |  |  |
Debt securities available-for-sale |  | 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—mortgage loans |  |  |  |
ASSETS |  |  |  |
Derivative financial assets |  | $ 0 |  |
LIABILITIES |  |  |  |
Derivative financial liabilities |  |  | $ 0 |
[1] | Includes a $5.9 million security purchase that was pending settlement as of December 31, 2017.
[2] | ASU No. 2016-01 was adopted January 1, 2018, resulting in separate classification of our marketable equity securities previously included in available-for-sale securities.

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