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Loans and Allowance for Loan Losses - Summary of Information about Corporation's Purchased Credit-Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at beginning of period $ 305,646 $ 254,153
Accretion 15,913 37,078
Reclass from non-accretable difference 768 16,393
Disposals/transfers (944) (592)
Balance at end of period 276,863 305,646
Recorded Investment [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at beginning of period 22,192 16,623
Acquisitions    15,260
Accretion 1,264 3,556
Payments received (7,603) (9,325)
Reclass from non-accretable difference      
Disposals/transfers (632) (3,922)
Contractual interest      
Balance at end of period 15,221 22,192
Accretable Yield [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at beginning of period (7,456) (778)
Acquisitions    (2,505)
Accretion 1,264 3,556
Payments received      
Reclass from non-accretable difference (332) (8,097)
Disposals/transfers 759 368
Contractual interest     
Balance at end of period (5,765) (7,456)
Expected Cash Flows [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at beginning of period 29,648 17,401
Acquisitions    17,765
Accretion      
Payments received (7,603) (9,325)
Reclass from non-accretable difference 332 8,097
Disposals/transfers (1,391) (4,290)
Contractual interest      
Balance at end of period 20,896 29,648
Non-Accretable Difference [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at beginning of period (26,852) (23,733)
Acquisitions    (24,266)
Accretion      
Payments received 437 1,345
Reclass from non-accretable difference 332 8,097
Disposals/transfers 1,129 14,405
Contractual interest (869) (2,700)
Balance at end of period (25,823) (26,852)
Outstanding Balance [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at beginning of period 56,500 41,134
Acquisitions    42,031
Accretion      
Payments received (8,040) (10,670)
Reclass from non-accretable difference      
Disposals/transfers (2,520) (18,695)
Contractual interest 869 2,700
Balance at end of period $ 46,809 $ 56,500