Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest income
Interest and fees on loans	$ 54,557	$ 49,514	$ 160,261	$ 147,111
Taxable interest and dividends on securities	5,455	4,563	14,934	13,903
Nontaxable interest and dividends on securities	31	36	95	110
Interest on loans held for sale	64	159	173	306
Interest on federal funds sold and short-term investments	121	96	212	203
Total interest and dividend income	60,228	54,368	175,675	161,633
Interest expense
Interest on deposits	2,951	2,735	8,636	8,314
Interest on borrowings	2,232	2,070	6,997	7,095
Total interest expense	5,183	4,805	15,633	15,409
Net interest income	55,045	49,563	160,042	146,224
Provision for loan losses	800	1,901	1,000	8,653
Net interest income after provision for loan losses	54,245	47,662	159,042	137,571
Noninterest income
Deposit account fees	4,754	4,656	13,385	13,478
Interchange and ATM fees	3,949	3,375	10,817	9,672
Investment management	4,981	5,016	15,616	14,755
Mortgage banking income	1,480	1,015	3,832	2,379
Loan level derivative income	968	381	2,816	1,452
Increase in cash surrender value of life insurance policies	958	774	2,685	2,217
Gain Realized on Life Insurance Policies	0	0	0	1,964
Available-For-Sale- Securities - Equity - Gross Realized Gains	0	67	19	138
Available-For-Sale Securities - Fixed Income Gross Realized Gains	0	0	798	0
Other noninterest income	2,157	1,814	6,096	5,414
Total noninterest income	19,247	17,098	56,064	51,469
Noninterest expenses
Salaries and employee benefits	26,685	23,651	78,291	69,574
Occupancy and equipment expenses	5,443	5,027	17,509	16,474
Data processing & facilities management	1,112	1,178	3,462	3,609
FDIC assessment	1,020	957	2,993	2,828
Advertising expense	1,414	1,179	4,101	3,252
Consulting expense	867	737	2,451	2,105
Legal Fees	746	547	1,462	1,397
Available-For-Sale Securities - Equity Gross Realized Losses	0	0	8	0
Available-for-Sale Securities - Fixed Income Gross Realized Losses	0	0	1,124	0
Loss on termination of derivatives	0	0	0	1,122
Business Combination, Acquisition Related Costs	0	677	10,501	754
Other noninterest expenses	9,744	8,654	28,750	26,359
Total noninterest expenses	47,031	42,607	150,652	127,474
Income before income taxes	26,461	22,153	64,454	61,566
Provision for income taxes	7,867	6,415	18,949	17,699
Net income	$ 18,594	$ 15,738	$ 45,505	$ 43,867
Basic earnings per share (in dollars per share)	$ 0.71	$ 0.66	$ 1.77	$ 1.84
Diluted earnings per share (in dollars per share)	$ 0.71	$ 0.66	$ 1.76	$ 1.83
Weighted average common shares (basic) (in shares)	26,200,621	23,911,678	25,774,571	23,876,391
Common shares equivalents (in shares)	63,493	90,685	72,921	95,320
Weighted average common shares (diluted) (in shares)	26,264,114	24,002,363	25,847,492	23,971,711
Retained Earnings [Member]
Noninterest expenses
Net income			$ 45,505	$ 43,867
Cash dividends declared per common share (in dollars per share)	$ 0.26	$ 0.24	$ 0.78	$ 0.72