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Business Combinations (Narrative) (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 14, 2017
USD ($)
Nov. 18, 2016
USD ($)
locations
Mar. 31, 2016
USD ($)
locations
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
financial_institution
Loan
Aug. 19, 2016
USD ($)
Business Acquisition [Line Items]            
Goodwill recorded on acquisition         $ 999  
FDIC loss sharing percentage on purchased loans, OREO, and certain other assets         80.00%  
Reduction in estimated loss share liability       $ 4,900    
First Community Financial Corporatiion (FCFC)            
Business Acquisition [Line Items]            
Number of locations | locations   2        
Assets acquired   $ 187,200        
Loans acquired   79,500        
Assumed deposits   150,300        
Goodwill recorded on acquisition   $ 13,800        
GE Capital Franchise Finance            
Business Acquisition [Line Items]            
Loans acquired           $ 561,400
Generations Bancorp Inc.            
Business Acquisition [Line Items]            
Number of locations | locations     1      
Assets acquired     $ 134,200      
Loans acquired     67,400      
Assumed deposits     100,200      
Goodwill recorded on acquisition     $ 11,500      
FDIC Assisted            
Business Acquisition [Line Items]            
Number of FDIC assisted banks acquired | financial_institution         9  
Loans subject to loss share agreements with FDIC | Loan         8  
American Homestead Mortgage, LLC (AHM)            
Business Acquisition [Line Items]            
Goodwill recorded on acquisition $ 999