Parent Statements of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income
Loss on sale of investments									$ (299)	$ 0	$ 346
Expenses
Compensation and employee benefits									104,221	95,373	85,691
Other operating expenses									38,856	36,087	33,742
Total non-interest expense	53,034	50,368	48,481	43,434	48,008	50,178	46,190	49,045	195,317	193,421	232,124
Income tax benefit	(8,630)	(8,315)	(5,927)	(7,145)	(5,853)	(4,760)	(3,843)	(4,621)	(30,017)	(19,077)	281
Net Income	26,546	25,628	22,702	20,768	20,758	19,444	18,981	16,333	95,644	75,516	17,471
Parent Company
Income
Dividends from subsidiaries									65,445	78,209	43,450
Loss on sale of investments									(3,248)	0	0
Other income									966	566	864
Intercompany charges for services									7,387	16,041	14,438
Total income									70,550	94,816	58,752
Expenses
Compensation and employee benefits									9,175	12,392	9,185
Other operating expenses									6,536	10,267	11,827
Total non-interest expense									15,711	22,659	21,012
Income Before Income Taxes									54,839	72,157	37,740
Income tax benefit									3,676	2,319	2,176
Income before equity in undistributed net income (loss) of subsidiaries									58,515	74,476	39,916
Equity in undistributed net income (loss) of subsidiaries									37,129	1,040	(22,825)
Net Income									$ 95,644	$ 75,516	$ 17,091