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Business Combinations (Narrative) (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 04, 2018
USD ($)
Loan
Oct. 16, 2017
USD ($)
Feb. 14, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
financial_institution
Loan
Jun. 30, 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     $ 405   $ 791
Gain contract termination       $ 400      
Goodwill recorded on acquisition           $ 9,106  
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 $ 9,100            
American Homestead Mortgage, LLC (AHM)              
Business Acquisition [Line Items]              
Goodwill recorded on acquisition     $ 999