Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest income
Interest and fees on loans	$ 583,872	$ 552,938	$ 547,896
Interest bearing deposits with banks	1,552	3,419	5,170
Federal funds sold and securities purchased under resale agreements	38	116	157
Securities	38,134	46,219	36,904
Trading account securities	28	44	394
Federal Home Loan Bank and Federal Reserve Bank stock	2,550	2,297	1,931
Brokerage customer receivables	847	760	655
Total interest income	627,021	605,793	593,107
Interest expense
Interest on deposits	68,305	87,938	123,779
Interest on Federal Home Loan Bank advances	12,103	16,320	16,520
Interest on notes payable and other borrowings	8,966	11,023	5,943
Interest on secured borrowings - owed to securitization investors	5,087	12,113	12,366
Interest on subordinated notes	428	750	995
Interest on junior subordinated debentures	12,616	16,272	17,668
Total interest expense	107,505	144,416	177,271
Net interest income	519,516	461,377	415,836
Provision for credit losses	76,436	102,638	124,664
Net interest income after provision for credit losses	443,080	358,739	291,172
Non-interest income
Wealth management	52,680	44,517	36,941
Mortgage banking	109,970	56,942	61,378
Service charges on deposit accounts	16,971	14,963	13,433
Gains on available-for-sale securities, net	4,895	1,792	9,832
Fees from covered call options	10,476	13,570	2,235
Gain on bargain purchases, net	7,503	37,974	44,231
Trading (losses) gains, net	(1,900)	337	5,165
Other	25,497	19,603	18,945
Total non-interest income	226,092	189,698	192,160
Non-interest expense
Salaries and employee benefits	288,589	237,785	215,766
Equipment	23,222	18,267	16,529
Occupancy, net	32,294	28,764	24,444
Data processing	15,739	14,568	15,355
Advertising and marketing	9,438	8,380	6,315
Professional fees	15,262	16,874	16,394
Amortization of other intangible assets	4,324	3,425	2,739
FDIC insurance	13,422	14,143	18,028
OREO expenses, net	22,103	26,340	19,331
Other	64,647	51,858	47,624
Total non-interest expense	489,040	420,404	382,525
Income before taxes	180,132	128,033	100,807
Income tax expense	68,936	50,458	37,478
Net income	111,196	77,575	63,329
Preferred stock dividends and discount accretion	9,093	4,128	19,643
Non-cash deemed preferred stock dividend	0	0	11,361
Net income applicable to common shares	$ 102,103	$ 73,447	$ 32,325
Net income per common share - Basic (in usd per share)	$ 2.81	$ 2.08	$ 1.08
Net income per common share - Diluted (in usd per share)	$ 2.31	$ 1.67	$ 1.02
Cash dividends declared per common share (in usd per share)	$ 0.18	$ 0.18	$ 0.18
Weighted average common shares outstanding (in shares)	36,365	35,355	30,057
Dilutive potential common shares (in shares)	11,669	8,636	1,513
Average common shares and dilutive common shares (in shares)	48,034	43,991	31,570