Loans - Period-End Non-Accrual Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 2,593	$ 2,280
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	325	304
Commercial Real Estate - Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total
Commercial Real Estate -Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	314	145
Student Loans - TERI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	38	19
Student Loans - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total
Consumer - Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	4	9
Consumer - Auto [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	10	3
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 1,902	$ 1,800