Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Loans, excluding covered loans	$ 297,823	$ 256,842	$ 239,224
Covered loans	2,480	8,659	13,804
Investment securities – taxable	18,082	14,516	12,249
Investment securities – tax-exempt	13,861	16,716	18,644
Other short-term investments	3,738	3,131	3,326
Total interest income	335,984	299,864	287,247
Interest Expense
Deposits	9,527	10,377	11,901
Borrowed funds	2,314	573	1,607
Senior and subordinated debt	12,545	12,062	13,607
Total interest expense	24,386	23,012	27,115
Net interest income	311,598	276,852	260,132
Provision for loan and covered loan losses	21,152	19,168	16,257
Net interest income after provision for loan and covered loan losses	290,446	257,684	243,875
Noninterest Income
Service charges on deposit accounts	39,979	36,910	36,526
Wealth management fees	29,162	26,474	24,185
Card-based fees	26,984	24,340	21,649
Merchant servicing fees	11,739	11,260	10,953
Mortgage banking income	5,741	4,011	5,306
Other service charges, commissions, and fees	13,654	8,086	7,663
BOLI income (loss)	4,185	2,873	(11,844)
Net securities gains	2,373	8,097	34,164
Other income	2,764	4,567	4,452
Gain on termination of FHLB forward commitments	0	0	7,829
Total noninterest income	136,581	126,618	140,883
Noninterest Expense
Salaries and wages	133,739	116,578	112,631
Retirement and other employee benefits	31,852	27,245	26,119
Net occupancy and equipment expense	38,720	35,181	31,832
Professional services	22,720	23,436	21,922
Technology and related costs	14,581	12,875	11,335
Merchant card expense	9,886	9,195	8,780
Advertising and promotions	7,606	8,159	7,754
FDIC premiums	6,017	5,824	6,438
Net OREO expense	5,281	7,075	8,547
Cardholder expense	5,243	4,251	4,021
Other expenses	21,601	20,135	17,358
Property valuation adjustments	8,581	0	0
Acquisition and integration related expenses	1,389	13,872	0
Total noninterest expense	307,216	283,826	256,737
Income before income tax expense	119,811	100,476	128,021
Income tax expense	37,747	31,170	48,715
Net income	$ 82,064	$ 69,306	$ 79,306
Per Common Share Data
Basic earnings per common share (in dollars per share)	$ 1.05	$ 0.92	$ 1.06
Diluted earnings per common share (in dollars per share)	$ 1.05	$ 0.92	$ 1.06
Weighted-average common shares outstanding (in shares)	77,059	74,484	73,984
Weighted-average diluted common shares outstanding (in shares)	77,072	74,496	73,994