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Loans and Leases - Schedule of Carrying Amount of Loans Acquired (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Mar. 23, 2018
Dec. 31, 2017
Jul. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable          
Expected losses and foregone interest $ (155,401)   $ (154,099)   $ (155,960)
Loans acquired with no evidence of deteriorated credit quality 3,143   14,953    
Related allowance (16,342)   $ (17,352)   $ (24,293)
Sabadell United          
Accounts, Notes, Loans and Financing Receivable          
Loans acquired 4,000,000     $ 4,030,777  
Covered loans acquired 158,600        
Gibraltar Private Bank & Trust Company          
Accounts, Notes, Loans and Financing Receivable          
Loans acquired   $ 1,447,475      
Contractually required principal and interest at acquisition 1,593,408        
Expected losses and foregone interest (25,029)        
Cash flows expected to be collected at acquisition 1,568,379        
Loans acquired with no evidence of deteriorated credit quality 1,426,756        
Impaired Financing Receivable, with Related Allowance, Recorded Investment 29,929        
Related allowance (3,636)        
Impaired Financing Receivable, Expected Cash Flow 26,293        
Accretable yield 5,574        
Loans acquired with deteriorated credit quality $ 20,719