Loans (Purchased Loans with Deteriorated Credity Quality) (Details) (Granite Corp [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Granite Corp [Member]
Deterioarted Loans Acquired Movement Schedule [Roll Forward]
Balance, beginning of period	$ 228,392	$ 330,836
Accretion	4,203	5,772
Payment received	(25,928)	(23,110)
Foreclosed and transferred to OREO	(783)	(3,109)
Subtotal before provision	(5,373)	0
Balance, end of period	200,511	310,389
Deteriorated Loans Acquired, Accretable Yield Movement Schedule [Roll Forward]
Future accretion balance, beginning of period	30,299	47,804
Future accretion, accretion	(4,203)	(5,772)
Future accretion balance, end of period	$ 26,096	$ 42,032