Consolidated Statements Of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest income
Interest and fees on loans	$ 151,984	$ 145,983	$ 299,014	$ 288,097
Interest bearing deposits with banks	319	411	568	980
Federal funds sold and securities purchased under resale agreements	6	4	10	19
Available-for-sale securities	13,309	9,359	26,423	18,111
Trading account securities	5	8	14	13
Federal Home Loan Bank and Federal Reserve Bank stock	727	693	1,438	1,377
Brokerage customer receivables	200	188	409	362
Total interest income	166,550	156,646	327,876	308,959
Interest expense
Interest on deposits	11,759	13,675	23,682	28,179
Interest on Federal Home Loan Bank advances	2,705	2,821	5,348	5,585
Interest on notes payable and other borrowings	510	1,132	1,260	2,286
Interest on subordinated notes	354	52	354	111
Interest on junior subordinated debentures	2,042	3,142	4,046	6,261
Total interest expense	17,370	20,822	34,690	42,422
Net interest income	149,180	135,824	293,186	266,537
Provision for credit losses	6,660	15,382	8,540	31,069
Net interest income after provision for credit losses	142,520	120,442	284,646	235,468
Non-interest income
Wealth management	18,222	15,892	35,035	30,720
Mortgage banking	23,804	31,734	40,232	61,879
Service charges on deposit accounts	5,688	5,035	11,034	9,828
(Losses) gains on available-for-sale securities, net	(336)	2	(369)	253
Fees from covered call options	1,244	993	2,786	2,632
Trading (losses) gains, net	(743)	3,260	(1,395)	2,825
Other	6,223	7,079	12,308	13,237
Total non-interest income	54,102	63,995	99,631	121,374
Non-interest expense
Salaries and employee benefits	81,963	79,225	161,897	156,738
Equipment	7,223	6,413	14,626	12,597
Occupancy, net	9,850	8,707	20,843	17,560
Data processing	4,543	4,358	9,258	8,957
Advertising and marketing	3,558	2,722	6,374	4,762
Professional fees	4,046	4,191	7,500	7,412
Amortization of other intangible assets	1,156	1,164	2,319	2,284
FDIC insurance	3,196	3,003	6,147	6,447
OREO expense, net	2,490	2,284	6,466	664
Other	15,566	16,120	29,476	30,885
Total non-interest expense	133,591	128,187	264,906	248,306
Income before taxes	63,031	56,250	119,371	108,536
Income tax expense	24,490	21,943	46,330	42,177
Net income	38,541	34,307	73,041	66,359
Preferred stock dividends and discount accretion	1,581	2,617	3,162	5,233
Net income applicable to common shares	$ 36,960	$ 31,690	$ 69,879	$ 61,126
Net income per common share-Basic (in usd per share)	$ 0.79	$ 0.85	$ 1.51	$ 1.64
Net income per common share-Diluted (in usd per share)	$ 0.76	$ 0.69	$ 1.44	$ 1.34
Cash dividends declared per common share	$ 0.10	$ 0.00	$ 0.20	$ 0.09
Weighted average common shares outstanding	46,520	37,486	46,358	37,231
Dilutive potential common shares	4,402	12,354	4,456	12,363
Average common shares and dilutive common shares	50,922	49,840	50,814	49,594