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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
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.