Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income
Interest and fees on loans	$ 65,667	$ 56,778	$ 186,747	$ 166,683
Interest Income, Securities, Operating, Taxable	5,642	5,034	16,618	15,500
Nontaxable interest and dividends on securities	19	28	71	89
Interest on loans held for sale	33	81	68	170
Interest on federal funds sold and short-term investments	417	387	814	767
Total interest and dividend income	71,778	62,308	204,318	183,209
Interest expense
Interest on deposits	3,331	2,733	9,010	8,339
Interest on borrowings	1,374	1,907	4,280	5,778
Total interest expense	4,705	4,640	13,290	14,117
Net interest income	67,073	57,668	191,028	169,092
Provision for loan losses	0	950	1,650	2,075
Net interest income after provision for loan losses	67,073	56,718	189,378	167,017
Noninterest income
Deposit account fees	4,401	4,766	13,337	13,979
Interchange and ATM fees	4,525	4,190	12,881	12,050
Investment management	5,967	5,446	17,576	16,183
Mortgage banking income	1,338	1,963	3,609	4,458
Available-For-Sale- Securities - Equity - Gross Realized Gains	12	0	19	5
Increase in cash surrender value of life insurance policies	1,019	984	3,000	2,980
Loan level derivative income	784	810	2,727	4,627
Other noninterest income	2,724	2,257	7,931	6,384
Total noninterest income	20,770	20,416	61,080	60,666
Noninterest expenses
Salaries and employee benefits	29,289	27,395	86,267	81,561
Occupancy and equipment expenses	6,085	5,433	18,302	16,927
Data processing & facilities management	1,272	1,400	3,732	3,831
FDIC assessment	673	725	2,234	2,655
Advertising expense	1,359	1,654	4,018	4,134
Professional Fees	937	770	2,753	2,235
Debit Card Expense	992	730	2,616	2,162
Legal Fees	1,423	321	2,074	1,132
Loss on extinguishment of debt	0	0	0	437
Available-For-Sale Securities - Equity Gross Realized Losses	1	0	6	32
Business Combination, Acquisition Related Costs	0	151	3,393	691
Mortgage operations expense	723	820	1,896	1,880
Software Maintenance	888	765	2,714	2,254
Other noninterest expenses	7,668	6,693	22,887	20,554
Total noninterest expenses	51,310	46,857	152,892	140,485
Income before income taxes	36,533	30,277	97,566	87,198
Provision for income taxes	12,681	9,793	32,426	27,729
Net income	$ 23,852	$ 20,484	$ 65,140	$ 59,469
Basic earnings per share (in dollars per share)	$ 0.87	$ 0.78	$ 2.39	$ 2.26
Diluted earnings per share (in dollars per share)	$ 0.87	$ 0.78	$ 2.38	$ 2.26
Weighted average common shares (basic) (in shares)	27,436,792	26,324,316	27,242,902	26,301,340
Common shares equivalents (in shares)	76,307	53,072	78,043	48,354
Weighted average common shares (diluted) (in shares)	27,513,099	26,377,388	27,320,945	26,349,694
Retained Earnings [Member]
Noninterest expenses
Net income			$ 65,140	$ 59,469
Cash dividends declared per common share (in dollars per share)	$ 0.32	$ 0.29	$ 0.96	$ 0.87