Loans - Pre-Modification and Post-Modification Outstanding Recorded Investments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Contract	Dec. 31, 2012 Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	82	100
Pre-Modification Outstanding Recorded Investment	$ 67,046	$ 99,494
Post-Modification Outstanding Recorded Investment	62,795	90,348
Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	16	20
Pre-Modification Outstanding Recorded Investment	27,415	40,785
Post-Modification Outstanding Recorded Investment	22,718	36,066
Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	13	18
Pre-Modification Outstanding Recorded Investment	13,788	40,499
Post-Modification Outstanding Recorded Investment	13,818	39,535
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	8	5
Pre-Modification Outstanding Recorded Investment	16,682	7,092
Post-Modification Outstanding Recorded Investment	18,133	4,885
Commercial real estate loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	21	23
Pre-Modification Outstanding Recorded Investment	30,470	47,591
Post-Modification Outstanding Recorded Investment	31,951	44,420
Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	38	43
Pre-Modification Outstanding Recorded Investment	8,661	10,133
Post-Modification Outstanding Recorded Investment	7,681	9,125
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	7	14
Pre-Modification Outstanding Recorded Investment	500	985
Post-Modification Outstanding Recorded Investment	$ 445	$ 737