Loans (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 04, 2011
Loans (Textual) [Abstract]
Changes in New loans		$ 28,000,000
Changes in affiliates loans		33,100,000
Changes in directors and affiliates loans		29,300,000
Balances of loans due from related Parties	64,700,000	40,500,000
Non accrual and renegotiated loans percentage	1.05%	2.52%
Non-accrual loans	103,270,000	120,985,000
Troubled Debt restructuring	18,100,000
Total restructured loans		12,600,000
Investment in impaired loans	62,300,000	107,739,000
Interest that would have been recognized on nonaccrual loans	4,900,000	5,700,000	2,000,000
Interest recovered on nonaccrual loans	1,100,000	1,000,000	300,000
Minimum Bank portfolio loan need to be reviewed	500,000
Accruing loans Period	90 days
Loans held for sale	72,378,000	21,866,000
Problem commercial loans held for sale	10,800,000
Mortgage loans held for loan	61,600,000
Covered loans				535,489,000
Covered Loans [Member]
Loans (Textual) [Abstract]
Increase in allowance for losses related to impairment loans	51,700,000	700,000
Restructured Commercial Loan [Member]
Loans (Textual) [Abstract]
Non-accrual loans	4,100,000
Minimum [Member]
Loans (Textual) [Abstract]
Period within which bank Loan reviewed	12
Maximum [Member]
Loans (Textual) [Abstract]
Period within which bank Loan reviewed	18
Loans [Member]
Loans (Textual) [Abstract]
Impairment of covered loans	(671,443,000)	(809,151,000)	(950,430,000)
FDIC [Member]
Loans (Textual) [Abstract]
Increase in indemnification asset	$ 48,800,000	$ 600,000