Loss Sharing Agreements and FDIC Indemnification Assets: Schedule of Impact of Acquired Loans on Financial Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Impact of acquired loan pools on net interest income	$ 8,017	$ 12,814	$ 14,180	$ 25,481
Impact of acquired loan pools on net interest margin (in basis points)	86	166	80	164
Impact of acquired loan pools on non-interest income	(6,619)	(11,491)	(11,150)	(22,753)
Net impact of acquired loan pools to pre-tax income	1,398	1,323	3,030	2,728
Net impact of acquired loan pools to net of taxes	$ 909	$ 860	$ 1,970	$ 1,773
Impact of acquired loan pools to diluted earnings per common share	$ 0.07	$ 0.07	$ 0.14	$ 0.13