Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income
Interest and fees on loans	$ 62,287	$ 55,636	$ 121,080	$ 109,905
Taxable interest and dividends on securities	5,609	5,269	10,976	10,466
Nontaxable interest and dividends on securities	26	29	52	61
Interest on loans held for sale	21	57	35	89
Interest on federal funds sold and short-term investments	190	169	397	380
Total interest and dividend income	68,133	61,160	132,540	120,901
Interest expense
Interest on deposits	2,912	2,738	5,679	5,606
Interest on borrowings	1,466	1,889	2,906	3,871
Total interest expense	4,378	4,627	8,585	9,477
Net interest income	63,755	56,533	123,955	111,424
Provision for loan losses	1,050	600	1,650	1,125
Net interest income after provision for loan losses	62,705	55,933	122,305	110,299
Noninterest income
Deposit account fees	4,392	4,618	8,936	9,213
Interchange and ATM fees	4,434	4,136	8,356	7,860
Investment management	5,995	5,734	11,609	10,737
Mortgage banking income	1,314	1,363	2,271	2,495
Available-For-Sale- Securities - Equity - Gross Realized Gains	3	5	7	5
Increase in cash surrender value of life insurance policies	1,017	982	1,981	1,996
Loan level derivative income	1,337	2,095	1,943	3,817
Other noninterest income	2,906	2,162	5,207	4,127
Total noninterest income	21,398	21,095	40,310	40,250
Noninterest expenses
Salaries and employee benefits	28,654	26,977	56,978	54,166
Occupancy and equipment expenses	6,059	5,667	12,217	11,494
Data processing & facilities management	1,188	1,225	2,460	2,431
FDIC assessment	778	920	1,561	1,930
Advertising expense	1,365	1,223	2,659	2,480
Professional Fees	1,262	864	1,816	1,465
Debit Card Expense	852	744	1,624	1,432
Loss on extinguishment of debt	0	0	0	437
Available-For-Sale Securities - Equity Gross Realized Losses	2	3	5	32
Business Combination, Acquisition Related Costs	2,909	206	3,393	540
Software Maintenance	896	735	1,826	1,489
Other noninterest expenses	8,844	8,582	17,043	15,732
Total noninterest expenses	52,809	47,146	101,582	93,628
Income before income taxes	31,294	29,882	61,033	56,921
Provision for income taxes	10,731	9,508	19,745	17,936
Net income	$ 20,563	$ 20,374	$ 41,288	$ 38,985
Basic earnings per share (in dollars per share)	$ 0.75	$ 0.77	$ 1.52	$ 1.48
Diluted earnings per share (in dollars per share)	$ 0.75	$ 0.77	$ 1.52	$ 1.48
Weighted average common shares (basic) (in shares)	27,257,799	26,304,129	27,144,350	26,289,726
Common shares equivalents (in shares)	74,497	47,885	78,757	45,679
Weighted average common shares (diluted) (in shares)	27,332,296	26,352,014	27,223,107	26,335,405
Retained Earnings [Member]
Noninterest expenses
Net income			$ 41,288	$ 38,985
Cash dividends declared per common share (in dollars per share)	$ 0.32	$ 0.29	$ 0.64	$ 0.58