Loans - Summary of Information Pertaining to Modified Terms of Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Contract	Dec. 31, 2012 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	9	7
Pre- Modification Outstanding Recorded Investment	$ 1,866	$ 2,336
Post- Modification Outstanding Recorded Investment	1,866	2,336
Troubled debt restructuring [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	1
Pre- Modification Outstanding Recorded Investment	309	47
Post- Modification Outstanding Recorded Investment	309	47
Troubled debt restructuring [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3	2
Pre- Modification Outstanding Recorded Investment	459	1,250
Post- Modification Outstanding Recorded Investment	459	1,250
Troubled debt restructuring [Member] | Consumer real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	3	3
Pre- Modification Outstanding Recorded Investment	761	655
Post- Modification Outstanding Recorded Investment	761	655
Troubled debt restructuring [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	1
Pre- Modification Outstanding Recorded Investment	337	384
Post- Modification Outstanding Recorded Investment	$ 337	$ 384