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Business Combinations and Asset Acquisitions (Narrative) (Detail)
Loan in Thousands, $ in Thousands
3 Months Ended
Dec. 14, 2018
USD ($)
Aug. 01, 2018
USD ($)
locations
Jan. 04, 2018
USD ($)
Loan
Mar. 31, 2019
USD ($)
Dec. 07, 2018
USD ($)
Business Acquisition [Line Items]          
Goodwill recorded on acquisition       $ 0  
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   $ 26,500      
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