Loans and Allowance for Loan Losses - Schedule of How Loans Were Modified as Troubled Debt Restructured Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Financing Receivable, Modifications [Line Items]
Adjusted Interest Rate	$ 973	$ 199	$ 177
Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Adjusted Interest Rate	2,354		128
Combined Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Adjusted Interest Rate	769		24
Commercial [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Adjusted Interest Rate	2,237		128
Commercial [Member] | Combined Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Adjusted Interest Rate	403
Real Estate Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Adjusted Interest Rate	113
Real Estate Member] | Combined Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Adjusted Interest Rate	350
Consumer [Member] | Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Adjusted Interest Rate	4
Consumer [Member] | Combined Rate and Maturity [Member]
Financing Receivable, Modifications [Line Items]
Adjusted Interest Rate	$ 16		$ 24