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Business Combinations and Asset Acquisitions (Detail)
Loan in Thousands, $ in Thousands
6 Months Ended
May 24, 2019
USD ($)
locations
Dec. 14, 2018
USD ($)
Aug. 01, 2018
USD ($)
locations
Jan. 04, 2018
USD ($)
Loan
Jun. 30, 2019
USD ($)
Dec. 07, 2018
USD ($)
Business Acquisition [Line Items]            
Goodwill recorded on acquisition         $ 10,726  
Rush-Oak Corporation            
Business Acquisition [Line Items]            
Number of locations acquired | locations 1          
Business combination, assets acquired $ 223,800          
Business combination, loans acquired 126,100          
Business combination, deposits acquired 161,200          
Goodwill recorded on acquisition $ 10,700          
Delaware Place Bank            
Business Acquisition [Line Items]            
Number of locations acquired | locations     1      
Business combination, assets acquired     $ 282,800      
Business combination, loans acquired     152,700      
Business combination, deposits acquired     213,100      
Goodwill recorded on acquisition     $ 26,600      
Veterans First            
Business Acquisition [Line Items]            
Goodwill recorded on acquisition       $ 9,100    
Number of loans acquired | Loan       10    
Unpaid principal balance       $ 1,600,000    
Elektra            
Business Acquisition [Line Items]            
Goodwill recorded on acquisition   $ 37,600        
American Enterprise Bank            
Business Acquisition [Line Items]            
Asset acquisition, assets acquired           $ 164,000
Asset acquisition, loans acquired           119,300
Asset acquisition, deposits acquired           $ 150,800