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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.