Loans - Pre-Modification and Post-Modification Outstanding Recorded Investments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Contract	Mar. 31, 2013 Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	17	32
Pre-Modification Outstanding Recorded Investment	$ 30,535	$ 11,372
Post-Modification Outstanding Recorded Investment	28,980	10,009
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	11	4
Pre-Modification Outstanding Recorded Investment	9,762	2,838
Post-Modification Outstanding Recorded Investment	9,093	1,590
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	5	5
Pre-Modification Outstanding Recorded Investment	15,946	4,454
Post-Modification Outstanding Recorded Investment	15,060	4,461
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	1	1
Pre-Modification Outstanding Recorded Investment	4,827	538
Post-Modification Outstanding Recorded Investment	4,827	538
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	6	6
Pre-Modification Outstanding Recorded Investment	20,773	4,992
Post-Modification Outstanding Recorded Investment	19,887	4,999
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	0	17
Pre-Modification Outstanding Recorded Investment	0	3,164
Post-Modification Outstanding Recorded Investment	0	3,091
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	0	5
Pre-Modification Outstanding Recorded Investment	0	378
Post-Modification Outstanding Recorded Investment	$ 0	$ 329