Allowance for Loan Losses allowance for acquired impaired loan losses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Acquired Loans	Sep. 30, 2014 Acquired Loans	Jun. 30, 2014 Acquired Loans	Dec. 31, 2013 Acquired Loans
allowance for acquired impaired loan losses [Line Items]
Provision for Loan and Lease Losses	$ 9,192	$ 6,379	$ 38,982	$ 23,634	$ 1,229	$ 5,465
Financing Receivable, Allowance for Credit Losses					6,206	6,206	4,977	741
Allowance for Loan and Lease Losses, Write-offs					0	0
Financing Receivable, Allowance for Credit Losses, Recovery					$ 0	$ 0