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Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Recent Accounting Pronouncements [Abstract]        
Federal corporate tax rate 21.00% 35.00%    
Salaries and employee benefits $ 151,685 $ 135,222 $ 132,060  
Other noninterest expense $ 19,597 20,308 17,294  
ASU 2018-02 [Member]        
Recent Accounting Pronouncements [Abstract]        
Reclassification upon ASU implementation   0    
ASU 2017-07 [Member]        
Recent Accounting Pronouncements [Abstract]        
Salaries and employee benefits   1,600 800  
Other noninterest expense   (1,600) $ (800)  
Plan [Member] | ASU 2016-02 [Member]        
Recent Accounting Pronouncements [Abstract]        
Right-of-use assets       $ 33,000
Lease liabilities       $ 36,000
AOCI [Member] | ASU 2018-02 [Member]        
Recent Accounting Pronouncements [Abstract]        
Reclassification upon ASU implementation   (5,575)    
AOCI [Member] | ASU 2016-01 [Member]        
Recent Accounting Pronouncements [Abstract]        
Reclassification upon ASU implementation   (2,645)    
Retained Earnings [Member] | ASU 2018-02 [Member]        
Recent Accounting Pronouncements [Abstract]        
Reclassification upon ASU implementation   5,575    
Retained Earnings [Member] | ASU 2016-01 [Member]        
Recent Accounting Pronouncements [Abstract]        
Reclassification upon ASU implementation   $ 2,618