Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Interest Income
Loans	$ 428,197		$ 324,229		$ 291,465
Taxable securities	55,969		38,659		35,167
Tax-exempt securities	12,201		11,045		11,121
Deposits in banks	702		813		216
Total interest income	497,069		374,746		337,969
Interest Expense
Deposits	12,105		4,800		3,134
Federal Home Loan Bank advances	3,750		1,078		671
Interest Expense, Subordinated Notes and Debentures	1,871		304		0
Other borrowings	504		575		545
Total interest expense	18,230		6,757		4,350
Net Interest Income	478,839		367,989		333,619
Provision for loan and lease losses	14,769		8,631		10,778
Net interest income after provision for loan and lease losses	464,070		359,358		322,841
Noninterest Income
Deposit account and treasury management fees	36,072		30,381		28,500
Card revenue	19,719		25,627		23,620
Financial services and trust revenue	12,135		11,478		11,266
Loan revenue	11,866		12,399		10,967
Merchant processing revenue	0		4,283		8,732
Bank owned life insurance	6,007		5,380		4,546
Investment securities gains (losses), net	(89)		(11)		1,181
Gain on sale of merchant card services portfolio	0		14,000		0
Change in FDIC loss sharing asset	0		(447)		(2,585)
Other	2,546		6,552		1,855
Total noninterest income	88,256		109,642		88,082
Noninterest Expense
Compensation and employee benefits	200,199		169,674		150,282
Occupancy	36,576		32,407		33,734
Merchant processing	0		2,196		4,330
Advertising and promotion	5,584		4,466		4,598
Data processing	20,235		18,205		16,488
Legal and professional fees	18,044		15,151		7,889
Taxes, licenses and fees	6,061		4,773		5,185
Regulatory premiums	3,710		3,183		3,777
Net cost of operation of other real estate owned	1,218		468		551
Amortization of intangibles	12,236		6,333		5,946
Other	36,627		34,161		28,362
Total noninterest expense	340,490		291,017		261,142
Income before income taxes	211,836		177,983		149,781
Income tax provision	38,954		65,155		44,915
Net Income	$ 172,882		$ 112,828		$ 104,866
Per Common Share
Basic earnings per common share	$ 2.36	[1]	$ 1.86	[1]	$ 1.81
Diluted earnings per common share	$ 2.36	[1]	$ 1.86	[1]	$ 1.81
Weighted average number of common shares outstanding	72,385		59,882		57,184
Weighted average number of diluted common shares outstanding	72,390		59,888		57,193

[1] Due to averaging of shares, quarterly earnings per share may not add up to the totals reported for the full year.