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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
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 [1] 801,703,000 779,133,000
Marketable equity securities 2,663,000 5,150,000
U.S. Treasury securities    
ASSETS    
Debt securities available-for-sale 10,355,000 10,040,000
Obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 163,703,000 157,697,000
Collateralized mortgage obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 181,162,000 189,348,000
Residential mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 19,768,000 22,418,000
Commercial mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 284,550,000 275,870,000
Obligations of states and political subdivisions    
ASSETS    
Debt securities available-for-sale 137,127,000 116,133,000
Fair Value Measurements, Recurring    
ASSETS    
Debt securities available-for-sale 801,703,000 779,133,000
Marketable equity securities 2,663,000 5,150,000
Total securities 804,366,000 784,283,000
Securities held in a deferred compensation plan 5,489,000 5,987,000
Total Assets 906,809,000 816,239,000
LIABILITIES    
Total Liabilities 94,880,000 25,615,000
Fair Value Measurements, Recurring | U.S. Treasury securities    
ASSETS    
Debt securities available-for-sale 10,355,000 10,040,000
Fair Value Measurements, Recurring | Obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 163,703,000 157,697,000
Fair Value Measurements, Recurring | Collateralized mortgage obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 181,162,000 189,348,000
Fair Value Measurements, Recurring | Residential mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 19,768,000 22,418,000
Fair Value Measurements, Recurring | Commercial mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 284,550,000 275,870,000
Fair Value Measurements, Recurring | Corporate obligations    
ASSETS    
Debt securities available-for-sale 5,038,000 7,627,000
Fair Value Measurements, Recurring | Obligations of states and political subdivisions    
ASSETS    
Debt securities available-for-sale 137,127,000 116,133,000
Fair Value Measurements, Recurring | Interest rate swaps    
ASSETS    
Derivative financial assets 94,371,000 25,647,000
LIABILITIES    
Derivative financial liabilities 94,286,000 25,615,000
Fair Value Measurements, Recurring | Interest rate lock commitments    
ASSETS    
Derivative financial assets 2,583,000 321,000
Fair Value Measurements, Recurring | Forward sale contracts    
ASSETS    
Derivative financial assets   1,000
LIABILITIES    
Derivative financial liabilities 594,000  
Fair Value Measurements, Recurring | Level 1    
ASSETS    
Debt securities available-for-sale 0 0
Marketable equity securities 2,602,000 5,078,000
Total securities 2,602,000 5,078,000
Securities held in a deferred compensation plan 5,489,000 5,987,000
Total Assets 8,091,000 11,065,000
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 | Corporate obligations    
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    
ASSETS    
Derivative financial assets   0
LIABILITIES    
Derivative financial liabilities 0  
Fair Value Measurements, Recurring | Level 2    
ASSETS    
Debt securities available-for-sale 801,703,000 779,133,000
Marketable equity securities 61,000 72,000
Total securities 801,764,000 779,205,000
Securities held in a deferred compensation plan 0 0
Total Assets 898,718,000 805,174,000
LIABILITIES    
Total Liabilities 94,880,000 25,615,000
Fair Value Measurements, Recurring | Level 2 | U.S. Treasury securities    
ASSETS    
Debt securities available-for-sale 10,355,000 10,040,000
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 163,703,000 157,697,000
Fair Value Measurements, Recurring | Level 2 | Collateralized mortgage obligations of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 181,162,000 189,348,000
Fair Value Measurements, Recurring | Level 2 | Residential mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 19,768,000 22,418,000
Fair Value Measurements, Recurring | Level 2 | Commercial mortgage-backed securities of U.S. government corporations and agencies    
ASSETS    
Debt securities available-for-sale 284,550,000 275,870,000
Fair Value Measurements, Recurring | Level 2 | Corporate obligations    
ASSETS    
Debt securities available-for-sale 5,038,000 7,627,000
Fair Value Measurements, Recurring | Level 2 | Obligations of states and political subdivisions    
ASSETS    
Debt securities available-for-sale 137,127,000 116,133,000
Fair Value Measurements, Recurring | Level 2 | Interest rate swaps    
ASSETS    
Derivative financial assets 94,371,000 25,647,000
LIABILITIES    
Derivative financial liabilities 94,286,000 25,615,000
Fair Value Measurements, Recurring | Level 2 | Interest rate lock commitments    
ASSETS    
Derivative financial assets 2,583,000 321,000
Fair Value Measurements, Recurring | Level 2 | Forward sale contracts    
ASSETS    
Derivative financial assets   1,000
LIABILITIES    
Derivative financial liabilities 594,000  
Fair Value Measurements, Recurring | Level 3    
ASSETS    
Debt securities available-for-sale 0 0
Marketable equity securities 0 0
Total securities 0 0
Securities held in a deferred compensation plan 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 | Corporate obligations    
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    
ASSETS    
Derivative financial assets   $ 0
LIABILITIES    
Derivative financial liabilities $ 0  
[1] Excludes interest receivable of $3.4 million at June 30, 2020 and $3.4 million at December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.