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Business Combinations - Summary of Contractually Required Principal and Interest Cash Payment of the Loans as of Acquisition Date for Purchased Credit Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
May. 22, 2015
Jun. 30, 2014
Merchants and Southern Banks of Florida [Member]      
Business Acquisition [Line Items]      
Contractually required principal and interest $ 24,446    
Non-accretable difference (3,814)    
Cash flows expected to be collected 20,632    
Accretable yield (3,254) $ (17,400)  
Total purchased credit-impaired loans acquired 17,378    
Coastal Bankshares, Inc. [Member]      
Business Acquisition [Line Items]      
Contractually required principal and interest 38,194    
Non-accretable difference (5,632)    
Cash flows expected to be collected 32,562    
Accretable yield (3,282)   $ (29,300)
Total purchased credit-impaired loans acquired $ 29,280