Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Loans, including fees	$ 95,864	$ 77,344	$ 281,216	$ 231,752
Investment securities:
Taxable	6,646	4,309	20,897	13,579
Tax-exempt	1,320	962	4,147	2,970
Federal funds sold and securities purchased under agreements to resell	581	666	1,916	2,174
Total interest income	104,411	83,281	308,176	250,475
Interest expense:
Deposits	2,974	1,412	8,132	4,380
Federal funds purchased and securities sold under agreements to repurchase	276	137	756	418
Other borrowings	842	487	2,576	1,431
Total interest expense	4,092	2,036	11,464	6,229
Net interest income	100,319	81,245	296,712	244,246
Provision for loan losses	2,062	912	8,082	6,198
Net interest income after provision for loan losses	98,257	80,333	288,630	238,048
Noninterest income:
Fees on deposit accounts	22,448	20,776	66,322	62,439
Mortgage banking income	3,446	6,286	14,210	16,104
Trust and investment services income	6,310	4,877	18,703	14,573
Securities gains, net	1,278		1,388	122
Other-than-temporary impairment losses	(753)		(753)
Recoveries on acquired loans	1,944	2,207	5,647	5,130
Amortization of FDIC indemnification asset, net				(5,901)
Other	1,367	1,194	4,532	5,032
Total noninterest income	36,040	35,340	110,049	97,499
Noninterest expense:
Salaries and employee benefits	47,245	41,972	143,711	123,941
Net occupancy expense	6,214	5,464	18,650	16,364
Information services expense	6,003	5,237	18,776	15,353
Furniture and equipment expense	3,751	3,234	11,422	9,157
OREO expense and loan related	1,753	2,085	5,648	4,733
Bankcard expense	2,748	2,940	8,404	8,859
Amortization of intangibles	2,494	1,891	7,496	5,687
Supplies, printing and postage expense	1,491	1,345	4,715	4,910
Professional fees	1,265	1,758	4,637	4,663
FDIC assessment and other regulatory charges	918	1,001	3,029	3,162
Advertising and marketing	852	790	2,400	2,293
Merger and branch consolidation related expenses	1,551	709	26,882	3,240
Other	5,289	4,765	17,066	16,712
Total noninterest expense	81,574	73,191	272,836	219,074
Earnings:
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	52,723	42,482	125,843	116,473
Provision for income taxes	17,677	14,387	40,710	39,368
Net income	35,046	28,095	85,133	77,105
Net income	$ 35,046	$ 28,095	$ 85,133	$ 77,105
Earnings per common share:
Basic (in dollars per share)	$ 1.20	$ 1.17	$ 2.92	$ 3.21
Diluted (in dollars per share)	1.19	1.16	2.90	3.18
Dividends per common share (in dollars per share)	$ 0.33	$ 0.31	$ 0.99	$ 0.89
Weighted-average common shares outstanding:
Basic (in shares)	29,115	24,016	29,023	23,989
Diluted (in shares)	29,385	24,278	29,291	24,229