Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income
Loans	$ 337,998	$ 300,303	$ 265,501
Investment securities – taxable	28,724	18,082	14,516
Investment securities – tax-exempt	8,737	13,861	16,716
Other short-term investments	2,873	3,738	3,131
Total interest income	378,332	335,984	299,864
Interest Expense
Deposits	9,863	9,527	10,377
Borrowed funds	6,313	2,314	573
Senior and subordinated debt	12,465	12,545	12,062
Total interest expense	28,641	24,386	23,012
Net interest income	349,691	311,598	276,852
Provision for loan losses	30,983	21,152	19,168
Net interest income after provision for loan losses	318,708	290,446	257,684
Noninterest Income
Service charges on deposit accounts	40,665	39,979	36,910
Wealth management fees	33,071	29,162	26,474
Card-based fees	29,104	26,984	24,340
Merchant servicing fees	12,533	11,739	11,260
Mortgage banking income	10,162	5,741	4,011
Capital market products income	10,024	4,806	2,231
Other service charges, commissions, and fees	9,542	8,848	5,855
Net gain on sale-leaseback transaction	5,509	0	0
BOLI income	3,647	4,185	2,873
Net securities gains	1,420	2,373	8,097
Other income	3,635	2,764	4,567
Total noninterest income	159,312	136,581	126,618
Noninterest Expense
Salaries and wages	151,341	133,739	116,578
Retirement and other employee benefits	33,309	31,852	27,245
Net occupancy and equipment expense	41,154	38,720	35,181
Professional services	25,122	22,720	23,436
Technology and related costs	14,765	14,581	12,875
Merchant card expense	10,782	9,886	9,195
Advertising and promotions	7,787	7,606	8,159
Federal Deposit Insurance Corporation (FDIC) premiums	6,268	6,017	5,824
Net OREO expense	3,024	5,281	7,075
Cardholder expense	5,812	5,243	4,251
Other expenses	24,834	21,601	20,135
Acquisition and integration related expenses	14,352	1,389	13,872
Lease cancellation fee	950	0	0
Property valuation adjustments	0	8,581	0
Total noninterest expense	339,500	307,216	283,826
Income before income tax expense	138,520	119,811	100,476
Income tax expense	46,171	37,747	31,170
Net income	$ 92,349	$ 82,064	$ 69,306
Per Common Share Data
Basic earnings per common share (in dollars per share)	$ 1.14	$ 1.05	$ 0.92
Diluted earnings per common share (in dollars per share)	$ 1.14	$ 1.05	$ 0.92
Weighted-average common shares outstanding (in shares)	79,797	77,059	74,484
Weighted-average diluted common shares outstanding (in shares)	79,810	77,072	74,496