Allowance for Loan Losses (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Allowance for loan losses
Impaired loans	$ 27,217		$ 27,217		$ 33,557
Allowance for Loan Losses Allocated	6,157		6,157		7,609
Increase in provision for decrease in FDIC indemnification asset	260	1,410	1,010	914
Allocated amount of specific reserves to customers whose loan terms have been modified in troubled debt restructurings	3,700		3,700		1,600
Loans modified in troubled debt restructurings	90	655
Minimum outstanding balance of non-homogeneous loans to be individually evaluated as to credit risk	100		100
Covered Loans
Allowance for loan losses
Loans Past Due Over 90 Day Still Accruing	24		24		630
Nonaccrual	2,700		2,700		4,300
Impaired loans	1,700		1,700		2,900
Allowance for Loan Losses Allocated	$ 100		$ 100		$ 236