Loans - Pre-Modification and Post-Modification Outstanding Recorded Investments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Contract	Jun. 30, 2013 Contract	Jun. 30, 2014 Contract	Jun. 30, 2013 Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	12	20	25	52
Pre-Modification Outstanding Recorded Investment	$ 5,072	$ 27,611	$ 32,519	$ 38,983
Post-Modification Outstanding Recorded Investment	5,041	27,459	30,934	36,882
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	3	6	7	10
Pre-Modification Outstanding Recorded Investment	1,469	13,912	7,682	16,750
Post-Modification Outstanding Recorded Investment	1,469	13,881	7,056	15,232
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	3	4	10	9
Pre-Modification Outstanding Recorded Investment	689	7,275	16,596	11,729
Post-Modification Outstanding Recorded Investment	710	7,266	15,641	11,727
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	1	4	3	5
Pre-Modification Outstanding Recorded Investment	457	4,936	5,784	5,474
Post-Modification Outstanding Recorded Investment	457	4,979	5,782	5,510
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	4	8	13	14
Pre-Modification Outstanding Recorded Investment	1,146	12,211	22,380	17,203
Post-Modification Outstanding Recorded Investment	1,167	12,245	21,423	17,237
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	4	5	4	22
Pre-Modification Outstanding Recorded Investment	2,325	1,414	2,325	4,578
Post-Modification Outstanding Recorded Investment	2,273	1,259	2,323	4,016
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	1	1	1	6
Pre-Modification Outstanding Recorded Investment	132	74	132	452
Post-Modification Outstanding Recorded Investment	$ 132	$ 74	$ 132	$ 397