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Business Combinations - Summary of Acquired Loans (Detail) - Merchants and Southern Banks of Florida [Member]
$ in Thousands
Mar. 22, 2015
USD ($)
Business Acquisition [Line Items]  
Acquired receivables subject to ASC 310-30, fair value at acquisition $ 17,378
Acquired receivables subject to ASC 310-30, gross contractual amounts 24,446
Acquired receivables subject to ASC 310-30, cashs flows not expected to be collected 3,814
Acquired receivables not subject to ASC 310-30, fair value at acquisition 174,077
Acquired receivables not subject to ASC 310-30, gross contractual amounts $ 178,763