Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest income
Interest and fees on loans	$ 296,987	$ 234,994
Mortgage loans held-for-sale	2,209	2,818
Interest bearing deposits with banks	5,300	2,796
Investment securities	27,956	19,128
Trading account securities	8	14
Federal Home Loan Bank and Federal Reserve Bank stock	1,355	1,298
Brokerage customer receivables	155	157
Total interest income	333,970	261,205
Interest expense
Interest on deposits	60,976	26,549
Interest on Federal Home Loan Bank advances	2,450	3,639
Interest on other borrowings	3,633	1,699
Interest on subordinated notes	1,775	1,773
Interest on junior subordinated debentures	3,150	2,463
Total interest expense	71,984	36,123
Net interest income	261,986	225,082
Provision for credit losses	10,624	8,346
Net interest income after provision for credit losses	251,362	216,736
Non-interest income
Wealth management	23,977	22,986
Mortgage banking	18,158	30,960
Total revenue from contracts with customers	39,382	38,180
Gains (losses) on investment securities, net	1,364	(351)
Fees from covered call options	1,784	1,597
Trading (losses) gains, net	(171)	103
Operating lease income, net	10,796	9,691
Other	16,901	11,836
Total non-interest income	81,657	85,679
Non-interest expense
Salaries and employee benefits	125,723	112,436
Equipment	11,770	10,072
Operating lease equipment depreciation	8,319	6,533
Occupancy, net	16,245	13,767
Data processing	7,525	8,493
Advertising and marketing	9,858	8,824
Professional fees	5,556	6,649
Amortization of other intangible assets	2,942	1,004
FDIC insurance	3,576	4,362
OREO expense, net	632	2,926
Other	22,228	19,283
Total non-interest expense	214,374	194,349
Income before taxes	118,645	108,066
Income tax expense	29,499	26,085
Net income	89,146	81,981
Preferred stock dividends	2,050	2,050
Net income applicable to common shares	$ 87,096	$ 79,931
Net income per common share-Basic (usd per share)	$ 1.54	$ 1.42
Net income per common share-Diluted (usd per share)	1.52	1.40
Cash dividends declared per common share (usd per share)	$ 0.25	$ 0.19
Weighted average common shares outstanding (in shares)	56,529	56,137
Dilutive potential common shares (in shares)	699	888
Average common shares and dilutive common shares (in shares)	57,228	57,025
Service charges on deposit accounts
Non-interest income
Total revenue from contracts with customers	$ 8,848	$ 8,857