Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income:
Loans, including fees	$ 93,600	$ 77,154	$ 185,352	$ 154,408
Investment securities:
Taxable	7,020	4,477	14,251	9,270
Tax-exempt	1,397	992	2,827	2,008
Federal funds sold and securities purchased under agreements to resell	762	756	1,335	1,508
Total interest income	102,779	83,379	203,765	167,194
Interest expense:
Deposits	2,661	1,368	5,158	2,969
Federal funds purchased and securities sold under agreements to repurchase	240	137	480	281
Other borrowings	847	475	1,734	944
Total interest expense	3,748	1,980	7,372	4,194
Net interest income	99,031	81,399	196,393	163,000
Provision for loan losses	2,313	2,727	6,020	5,286
Net interest income after provision for loan losses	96,718	78,672	190,373	157,714
Noninterest income:
Fees on deposit accounts	22,155	21,539	43,874	41,663
Mortgage banking income	5,195	5,620	10,764	9,818
Trust and investment services income	6,452	4,911	12,393	9,697
Securities gains, net	110		110	122
Recoveries on acquired loans	2,171	2,002	3,703	2,923
Amortization of FDIC indemnification asset, net		(4,427)		(5,901)
Other	1,491	2,473	3,165	3,838
Total noninterest income	37,574	32,118	74,009	62,160
Noninterest expense:
Salaries and employee benefits	47,580	40,537	96,466	81,969
Net occupancy expense	6,048	5,541	12,436	10,900
Information services expense	6,413	5,083	12,773	10,117
Furniture and equipment expense	3,877	3,072	7,671	5,923
OREO expense and loan related	1,753	874	3,895	2,648
Bankcard expense	2,886	3,040	5,656	5,919
Amortization of intangibles	2,495	1,892	5,002	3,795
Supplies, printing and postage expense	1,570	1,757	3,224	3,565
Professional fees	1,599	1,576	3,372	2,906
FDIC assessment and other regulatory charges	989	1,017	2,111	2,161
Advertising and marketing	989	858	1,548	1,502
Merger and branch consolidation related expenses	4,307	1,573	25,331	2,531
Other	6,033	7,034	11,777	11,947
Total noninterest expense	86,539	73,854	191,262	145,883
Earnings:
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	47,753	36,936	73,120	73,991
Provision for income taxes	15,930	12,420	23,033	24,981
Net income	31,823	24,516	50,087	49,010
Net income	$ 31,823	$ 24,516	$ 50,087	$ 49,010
Earnings per common share:
Basic (in dollars per share)	$ 1.09	$ 1.02	$ 1.73	$ 2.04
Diluted (in dollars per share)	1.08	1.01	1.71	2.02
Dividends per common share (in dollars per share)	$ 0.33	$ 0.30	$ 0.66	$ 0.58
Weighted-average common shares outstanding:
Basic (in shares)	29,095	23,995	28,985	23,977
Diluted (in shares)	29,365	24,237	29,252	24,205