Balance and Interest Income Related to Impaired Loan Pools (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Interest income recognized	$ 210	$ 213
PCI loans
Financing Receivable, Recorded Investment [Line Items]
Interest income recognized	83	90
TDRs \| PCI loans
Financing Receivable, Recorded Investment [Line Items]
Interest income recognized	$ 78	$ 148

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration