Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies [Abstract]

Off-balance sheet financial instruments

(Dollars in thousands)	Contract/Notional Amount
Financial instruments representing credit risk:
Commitments to extend credit	$	480,686
Performance letters of credit		28,027
Financial standby letters of credit		20,682
Other letters of credit		197

Summary of the future minimum rental commitments under non-cancelable operating leases net of related sublease revenue

(Dollars in thousands)
Year	Amount
2013	$	2,087
2014		2,029
2015		1,890
2016		1,799
2017		1,596
Thereafter		17,490
Total	$	26,891

Summary of rental expense charged to operations

(Dollars in thousands)	2012			2011			2010
Rental expense	$	2,250		$	2,169		$	2,024
Sublease rental income		(396	)		(371	)		(424	)
Net rental expense	$	1,854		$	1,798		$	1,600