Parent Company Financial Information (Condensed Statements of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Expense
Compensation and employee benefits									$ 81,552	$ 69,780	$ 47,275
Long-term obligations									579	1,029	1,197
Other expense									17,154	14,603	10,179
Loss before income tax expense (benefit) and equity in undistributed net income of subsidiaries	20,418	26,116	11,302	8,106	10,326	9,175	5,724	7,850	65,942	33,075	(12,946)
Income tax expense (benefit)	5,664	7,244	2,670	2,327	(2,282)	3,971	668	(66)	17,905	2,291	(8,978)
Net Income (Loss)	14,754	18,872	8,632	5,779	12,608	5,204	5,056	7,916	48,037	30,784	(3,968)
Parent [Member]
Income
Dividend from banking subsidiaries									0	0	200
Interest-earning deposits									712	1,319	1,095
Other income									17	31	36
Total Income									729	1,350	1,331
Expense
Compensation and employee benefits									88	96	512
Long-term obligations									579	1,029	1,196
Other expense									1,114	1,066	1,104
Total Expenses									1,781	2,191	2,812
Loss before income tax expense (benefit) and equity in undistributed net income of subsidiaries									(1,052)	(841)	(1,481)
Income tax expense (benefit)									91	(778)	(580)
Income before equity in undistributed net income (loss) of subsidiaries									(1,143)	(63)	(901)
Equity in undistributed net income (loss) of subsidiaries									49,180	30,847	(3,067)
Net Income (Loss)									$ 48,037	$ 30,784	$ (3,968)