Segment and Related Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 item	Sep. 30, 2012	Dec. 31, 2012
Segment and Related Information
Number of reportable segments			4
Information about the revenues, operating results, goodwill and assets
Net interest income (expense)	$ 71,452	$ 1,247	$ 207,138	$ 3,719
Provision for loan losses	10,658		34,952
Noninterest income	205,758	39,583	658,269	114,495
Noninterest expense	216,617	46,792	692,008	139,582
Income (loss) before income taxes	49,935	(5,962)	138,447	(21,368)
Goodwill	251,808		251,808		253,770
Total assets	9,093,592		9,093,592		7,286,865
Operating segment | Banking
Information about the revenues, operating results, goodwill and assets
Net interest income (expense)	70,230		206,661
Provision for loan losses	10,661		34,927
Noninterest income	17,156		41,041
Noninterest expense	34,474		98,484
Income (loss) before income taxes	42,251		114,291
Goodwill	207,741		207,741		209,703
Total assets	8,143,611		8,143,611		6,195,775
Operating segment | Mortgage Origination
Information about the revenues, operating results, goodwill and assets
Net interest income (expense)	(8,907)		(32,849)
Noninterest income	127,460		439,246
Noninterest expense	115,135		373,405
Income (loss) before income taxes	3,418		32,992
Goodwill	13,071		13,071		13,071
Total assets	1,212,909		1,212,909		1,548,384
Operating segment | Insurance
Information about the revenues, operating results, goodwill and assets
Net interest income (expense)	902		2,755
Noninterest income	42,162		122,365
Noninterest expense	38,795		135,729
Income (loss) before income taxes	4,269		(10,609)
Goodwill	23,988		23,988		23,988
Total assets	306,308		306,308		305,699
Operating segment | Financial Advisory
Information about the revenues, operating results, goodwill and assets
Net interest income (expense)	2,682		9,409
Provision for loan losses	(3)		25
Noninterest income	25,709		77,349
Noninterest expense	28,324		84,887
Income (loss) before income taxes	70		1,846
Goodwill	7,008		7,008		7,008
Total assets	530,959		530,959		592,017
All Other and Eliminations | All Other and Eliminations
Information about the revenues, operating results, goodwill and assets
Net interest income (expense)	6,545		21,162
Noninterest income	(6,729)		(21,732)
Noninterest expense	(111)		(497)
Income (loss) before income taxes	(73)		(73)
Total assets	$ (1,100,195)		$ (1,100,195)		$ (1,355,010)