Parent Company Financial Information (Condensed Statements of Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Expense
Compensation and employee benefits									$ 85,434	$ 81,552	$ 69,780
Long-term obligations									0	579	1,029
Other expense									21,015	17,154	14,603
Loss before income tax expense (benefit) and equity in undistributed net income of subsidiaries	18,804	16,535	16,266	12,100	20,418	26,116	11,302	8,106	63,705	65,942	33,075
Income tax expense (benefit)	5,342	4,655	4,367	3,198	5,664	7,244	2,670	2,327	17,562	17,905	2,291
Net Income (Loss)	13,462	11,880	11,899	8,902	14,754	18,872	8,632	5,779	46,143	48,037	30,784
Parent [Member]
Income
Dividend from banking subsidiaries									48,950	0	0
Interest-earning deposits									153	712	1,319
Other income									0	17	31
Total Income									49,103	729	1,350
Expense
Compensation and employee benefits									182	88	96
Long-term obligations									0	579	1,029
Other expense									1,193	1,114	1,066
Total Expenses									1,375	1,781	2,191
Loss before income tax expense (benefit) and equity in undistributed net income of subsidiaries									47,728	(1,052)	(841)
Income tax expense (benefit)									(435)	91	(778)
Income before equity in undistributed net income (loss) of subsidiaries									48,163	(1,143)	(63)
Equity in undistributed net income (loss) of subsidiaries									(2,020)	49,180	30,847
Net Income (Loss)									$ 46,143	$ 48,037	$ 30,784