Accounting Policies and Other Matters (Details) (USD $)	3 Months Ended	6 Months Ended	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012 Noncovered Loans	Mar. 31, 2012 Noncovered Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum period of fair value refinement after transaction closing date		1 year
Adjustments to acquisition gains	$ 0
Threshold amount for individual impairment analysis			500,000	1,000,000
Impact of change in estimation method on allowance			$ 2,615,000