Loans - Outstanding Loan Balances (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	$ 594,562	$ 664,051
Less:
Deferred loan fees, net	(282)	(312)
Allowance for loan and lease losses	13,542	11,103
Net loans	581,302	653,260
Commercial [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	169,193	232,276
Real estate - construction loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	15,625	16,863
Real estate - commercial (investor) [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	208,530	211,318
Real estate - commercial (owner occupied) [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	80,101	75,085
Real estate - ITIN loans [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	57,232	60,105
Real estate - mortgage [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	15,872	18,452
Real estate - equity lines [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	43,989	45,181
Consumer [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	3,753	4,422
Other [Member]
Noncancelable Obligations Future Minimum Payments Due [Line Items]
Gross portfolio loans	$ 267	$ 349