Allowance for Loan Losses Details Textual (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Allowance For Loan And Lease Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$ 3,800,000		$ 9,400,000
Loan Commitments	5,666,483,000	5,116,633,000	5,666,483,000	5,116,633,000		5,546,635,000
Minimum Non Performing Substandard Loans Outstanding for Allowance for Credit Losses	300,000		300,000
Minimum Non Performing Substandard Doubtful Loans Outstanding for Allowance for Credit Losses	100,000		100,000
Impaired Financing Receivable, Interest Income, Accrual Method	0	79,000	100,000	165,000
Covered Loans
Allowance For Loan And Lease Losses [Line Items]
Loans and Leases Receivable, Allowance, Covered	45,109,000	49,069,000	45,109,000	49,069,000	49,970,000	44,027,000	47,945,000	43,255,000
Provision for Loan Losses Before Benefit Attributable to FDIC Loss Share Agreements	(451,000)	6,477,000	7,428,000	16,154,000
Benefit Attributable to FDIC Loss Share Agreements	3,897,000	(2,319,000)	(927,000)	(7,858,000)
Provision for Loan Lease and Other Losses Covered	3,446,000	4,158,000	6,501,000	8,296,000
Total impaired loans with no related allowance
Allowance For Loan And Lease Losses [Line Items]
Loan Commitments	1,600,000		1,600,000
Impaired Receivables prior to impairment
Allowance For Loan And Lease Losses [Line Items]
Impaired Financing Receivable, Interest Income, Accrual Method	$ 500,000	$ 1,100,000	$ 1,300,000	$ 1,800,000