Loans (Details) (Real estate - mortgage, 1-4 family residential [Member], PC [Member], Granite Corp [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Real estate - mortgage, 1-4 family residential [Member] | PC [Member] | Granite Corp [Member]
Financing Receivable [Line Items]
Loans purchases	$ 61.9
Loans purchases premium	$ 2.3