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Business Combinations (Narrative) (Detail)
$ in Thousands
3 Months Ended
Jan. 04, 2018
USD ($)
Loan
Oct. 16, 2017
USD ($)
Feb. 14, 2017
USD ($)
Mar. 31, 2018
USD ($)
financial_institution
Loan
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Business Acquisition [Line Items]              
FDIC loss sharing percentage on purchased loans, OREO, and certain other assets       80.00%      
Reduction in estimated loss share liability           $ 4,900  
Payments received from the FDIC   $ 15,200         $ 386
Gain contract termination         $ 400    
Goodwill recorded on acquisition       $ 10,229      
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      
Veterans First Mortgage              
Business Acquisition [Line Items]              
Number of loans acquired | Loan 10,000            
Unpaid principal balance $ 1,600,000            
Goodwill recorded on acquisition $ 10,200            
American Homestead Mortgage, LLC (AHM)              
Business Acquisition [Line Items]              
Goodwill recorded on acquisition     $ 999