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Loans and the Allowance for Loan Losses - Fair Value of Loans Acquired with Deteriorated Credit Quality (Detail) - American Gateway Financial Corporation [Member]
$ in Thousands
Apr. 01, 2015
USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]  
Purchased Impaired Credits, Contractually required principal and interest $ 11,294
Purchased Impaired Credits, Nonaccretable difference 6,375
Purchased Impaired Credits, Cash flows expected to be collected 4,919
Purchased Impaired Credits, Accretable yield 0
Purchased Impaired Credits, Fair value of Purchased Impaired Credits at Acquisition $ 4,919