Allowance for Loan Losses - Non Accrual Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable Recorded Investment Nonaccrual Status [Abstract]
Non-accrual loans	$ 15,695	$ 19,594
Construction [Member]
Financing Receivable Recorded Investment Nonaccrual Status [Abstract]
Non-accrual loans	12	14
Land, Farmland, Agriculture [Member]
Financing Receivable Recorded Investment Nonaccrual Status [Abstract]
Non-accrual loans	672	709
Residential / Prime [Member]
Financing Receivable Recorded Investment Nonaccrual Status [Abstract]
Non-accrual loans	6,172	7,152
Residential / Subprime [Member]
Financing Receivable Recorded Investment Nonaccrual Status [Abstract]
Non-accrual loans	6,987	9,195
Commercial & Non-Residential [Member]
Financing Receivable Recorded Investment Nonaccrual Status [Abstract]
Non-accrual loans	1,367	1,967
Consumer [Member]
Financing Receivable Recorded Investment Nonaccrual Status [Abstract]
Non-accrual loans	420	491
Commercial and Industrial [Member]
Financing Receivable Recorded Investment Nonaccrual Status [Abstract]
Non-accrual loans	65	66
Multi Family [Member]
Financing Receivable Recorded Investment Nonaccrual Status [Abstract]
Non-accrual loans	$ 0	$ 0