Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest income
Interest and fees on loans	$ 159,823	$ 151,984	$ 314,499	$ 299,014
Interest bearing deposits with banks	305	319	621	568
Federal funds sold and securities purchased under resale agreements	1	6	3	10
Available-for-sale securities	14,071	13,309	28,471	26,423
Trading account securities	51	5	64	14
Federal Home Loan Bank and Federal Reserve Bank stock	785	727	1,554	1,438
Brokerage customer receivables	205	200	386	409
Total interest income	175,241	166,550	345,598	327,876
Interest expense
Interest on deposits	11,996	11,759	23,810	23,682
Interest on Federal Home Loan Bank advances	1,812	2,705	3,968	5,348
Interest on other borrowings	787	510	1,575	1,260
Interest on subordinated notes	1,777	354	3,552	354
Interest on junior subordinated debentures	1,977	2,042	3,910	4,046
Total interest expense	18,349	17,370	36,815	34,690
Net interest income	156,892	149,180	308,783	293,186
Provision for credit losses	9,482	6,660	15,561	8,540
Net interest income after provision for credit losses	147,410	142,520	293,222	284,646
Non-interest income
Wealth management	18,476	18,222	36,576	35,035
Mortgage banking	36,007	23,804	63,807	40,232
Service charges on deposit accounts	6,474	5,688	12,771	11,034
(Losses) gains on available-for-sale securities, net	(24)	(336)	500	(369)
Fees from covered call options	4,565	1,244	8,925	2,786
Trading gains (losses), net	160	(743)	(317)	(1,395)
Other	11,355	6,223	19,292	12,308
Total non-interest income	77,013	54,102	141,554	99,631
Non-interest expense
Salaries and employee benefits	94,421	81,963	184,551	161,897
Equipment	7,914	7,223	15,750	14,626
Occupancy, net	11,401	9,850	23,752	20,843
Data processing	6,081	4,543	11,529	9,258
Advertising and marketing	6,406	3,558	10,313	6,374
Professional fees	5,074	4,046	9,738	7,500
Amortization of other intangible assets	934	1,156	1,947	2,319
FDIC insurance	3,047	3,196	6,034	6,147
OREO expense, net	841	2,490	2,252	6,466
Other	18,178	15,566	35,749	29,476
Total non-interest expense	154,297	133,591	301,615	264,906
Income before taxes	70,126	63,031	133,161	119,371
Income tax expense	26,295	24,490	50,278	46,330
Net income	43,831	38,541	82,883	73,041
Preferred stock dividends and discount accretion	1,580	1,581	3,161	3,162
Net income applicable to common shares	$ 42,251	$ 36,960	$ 79,722	$ 69,879
Net income per common share-Basic (in usd per share)	$ 0.89	$ 0.79	$ 1.68	$ 1.51
Net income per common share-Diluted (in usd per share)	0.85	0.76	1.61	1.44
Cash dividends declared per common share (in usd per share)	$ 0.11	$ 0.10	$ 0.22	$ 0.20
Weighted average common shares outstanding	47,567	46,520	47,404	46,358
Dilutive potential common shares	4,156	4,402	4,220	4,456
Average common shares and dilutive common shares	51,723	50,922	51,624	50,814