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Loans and Leases - Schedule of Carrying Amount of Loans Acquired (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 23, 2018
Dec. 31, 2017
Sep. 30, 2017
Jul. 31, 2017
Accounts, Notes, Loans and Financing Receivable          
Expected losses and foregone interest $ (151,671)     $ (157,660)  
Loans acquired with no evidence of deteriorated credit quality 7,249   $ 14,953    
Related allowance (16,248)   (17,352)    
Sabadell United          
Accounts, Notes, Loans and Financing Receivable          
Loans acquired         $ 4,030,777
Covered loans acquired     $ 158,600    
Gibraltar Private Bank & Trust Company          
Accounts, Notes, Loans and Financing Receivable          
Loans acquired   $ 1,465,278      
Contractually required principal and interest at acquisition 1,695,918        
Expected losses and foregone interest (19,952)        
Cash flows expected to be collected at acquisition 1,675,966        
Loans acquired with no evidence of deteriorated credit quality 1,455,044        
Impaired Financing Receivable, with Related Allowance, Recorded Investment 43,779        
Related allowance (31,174)        
Impaired Financing Receivable, Expected Cash Flow 12,605        
Accretable yield (2,371)        
Loans acquired with deteriorated credit quality $ 10,234