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Information on Impaired PCI Loan Pools (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($) Loan	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Loan	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Loan
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance	$ 6,323		$ 6,323		$ 11,277
Recorded investment	6,271		6,271		11,184
Interest income recognized	176	$ 218	386	$ 431
Average recorded investment	6,282	12,387	7,827	12,639
PCI loans
Financing Receivable, Recorded Investment [Line Items]
Unpaid principal balance	1,120		1,120		3,759
Recorded investment	$ 1,122		1,122		2,834
Allowance for loan losses			$ 12		$ 54
Number of impaired loans | Loan	1,000		1,000		2,000
Interest income recognized	$ 35	87	$ 118	177
Average recorded investment	$ 2,666	$ 3,462	$ 2,728	$ 3,677

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