Commitments and Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]
Fee income on standby letters of credit	$ 94,000	$ 153,000	$ 91,000
Operating leases rental expense	2,800,000	1,900,000	1,600,000
Unpaid principal balance of loans repurchased	843,000	773,000
Reserve for loans repurchases	$ 250,000	$ 118,000
Minimum [Member]
Commitments and Contingencies Disclosure [Line Items]
Lease expiration period	9 months
Lease expiration period, renewal option	2 years
Maximum [Member]
Commitments and Contingencies Disclosure [Line Items]
Lease expiration period	23 years
Lease expiration period, renewal option	25 years