Other Real Estate Owned (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Activity in the other real estate owned (OREO) portfolio, net of valuation reserve
Balance at beginning of period	$ 101,680	$ 85,570	$ 93,290	$ 75,613
Property additions	3,432	11,062	19,350	30,513
Development improvements	197	145	515	2,167
Less: Property disposals, net of gains/losses	10,342	10,057	15,688	19,180
Less: Period valuation adjustments	5,296	4,109	7,796	6,502
Balance at end of period	89,671	82,611	89,671	82,611
Activity in the valuation allowance
Balance at beginning of period	23,994	21,883	23,462	22,220
Provision for unrealized losses	5,127	4,109	7,627	6,434
Reductions taken on sales	(1,821)	(4,488)	(3,789)	(7,218)
Other adjustments	169		169	68
Balance at end of period	27,469	21,504	27,469	21,504
Expenses related to foreclosed assets, net of lease revenue
Gain on sales, net	(355)	(402)	(378)	(636)
Provision for unrealized losses	5,127	4,109	7,627	6,434
Operating expenses	1,661	1,842	3,815	4,831
Less: Lease revenue	911	957	2,090	1,477
Expenses related to foreclosed assets, net of lease revenue	$ 5,522	$ 4,592	$ 8,974	$ 9,152