Loans and Asset Quality Information (Details 10) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Provisions	$ 79,672	$ 41,301	$ 54,562
Loans receivable:
Ending balance - total	282,314	361,234
Covered
Beginning balance	5,808	11,155
Charge-offs	(10,728)	(18,123)
Recoveries
Provisions	9,679	12,776
Ending balance	4,759	5,808
Individually evaluated for impairment	4,459	5,481
Collectively evaluated for impairment	300
Loans acquired with deteriorated credit quality	17	327
Loans receivable:
Ending balance - total	282,314	361,234
Individually evaluated for impairment	74,914	44,723
Collectively evaluated for impairment	207,400	316,511
Loans acquired with deteriorated credit quality	$ 4,825	$ 7,864