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Subsequent Event (Details Textual) - USD ($)
Jan. 16, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Total assets   $ 12,115,484,000 $ 9,706,349,000
Gross loans   $ 8,287,549,000 $ 6,577,824,000
Acquisition of The First National Bank of Layton      
Subsequent Event [Line Items]      
Subsequent Event, Description the Company announced the signing of a definitive agreement to acquire FNB Bancorp and its wholly-owned subsidiary, The First National Bank of Layton, a community bank based in Layton, Utah    
Total assets $ 334,709,000    
Gross loans 246,724,000    
Total deposits $ 285,752,000