Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest income
Interest and fees on loans	$ 54,016,000	$ 49,393,000	$ 105,704,000	$ 97,597,000
Taxable interest and dividends on securities	4,852,000	4,690,000	9,479,000	9,340,000
Nontaxable interest and dividends on securities	30,000	37,000	64,000	74,000
Interest on loans held for sale	58,000	96,000	109,000	147,000
Interest on federal funds sold and short-term investments	60,000	69,000	91,000	106,000
Total interest and dividend income	59,016,000	54,285,000	115,447,000	107,264,000
Interest expense
Interest on deposits	2,922,000	2,789,000	5,685,000	5,579,000
Interest on borrowings	2,347,000	2,443,000	4,765,000	5,026,000
Total interest expense	5,269,000	5,232,000	10,450,000	10,605,000
Net interest income	53,747,000	49,053,000	104,997,000	96,659,000
Provision for loan losses	700,000	2,250,000	200,000	6,752,000
Net interest income after provision for loan losses	53,047,000	46,803,000	104,797,000	89,907,000
Noninterest income
Deposit account fees	4,465,000	4,463,000	8,631,000	8,821,000
Interchange and ATM fees	3,767,000	3,322,000	6,868,000	6,298,000
Investment management	5,528,000	5,136,000	10,635,000	9,739,000
Mortgage banking income	1,226,000	877,000	2,352,000	1,364,000
Loan level derivative income	1,430,000	324,000	1,848,000	1,070,000
Increase in cash surrender value of life insurance policies	949,000	721,000	1,727,000	1,443,000
Gain Realized on Life Insurance Policies	0	337,000	0	1,964,000
Available-For-Sale- Securities - Equity - Gross Realized Gains	19,000	(20,000)	19,000	71,000
Available-For-Sale Securities - Fixed Income Gross Realized Gains	798,000	0	798,000	0
Other noninterest income	2,079,000	1,697,000	3,939,000	3,602,000
Total noninterest income	20,261,000	16,857,000	36,817,000	34,372,000
Noninterest expenses
Salaries and employee benefits	26,318,000	22,843,000	51,606,000	45,923,000
Occupancy and equipment expenses	5,672,000	5,301,000	12,066,000	11,447,000
Data processing & facilities management	1,228,000	1,179,000	2,350,000	2,432,000
FDIC assessment	1,017,000	966,000	1,973,000	1,871,000
Advertising expense	1,853,000	1,249,000	2,687,000	2,073,000
Consulting expense	829,000	810,000	1,585,000	1,368,000
Available-For-Sale Securities - Equity Gross Realized Losses	8,000	0	8,000	0
Available-for-Sale Securities - Fixed Income Gross Realized Losses	1,124,000	0	1,124,000	0
Loss on termination of derivatives	0	1,122,000	0	1,122,000
Business Combination, Acquisition Related Costs	271,000	0	10,501,000	77,000
Other noninterest expenses	10,324,000	9,510,000	19,722,000	18,553,000
Total noninterest expenses	48,644,000	42,980,000	103,622,000	84,866,000
Income before income taxes	24,664,000	20,680,000	37,992,000	39,413,000
Provision for income taxes	7,213,000	5,934,000	11,082,000	11,284,000
Net income	$ 17,451,000	$ 14,746,000	$ 26,910,000	$ 28,129,000
Basic earnings per share (in dollars per share)	$ 0.67	$ 0.62	$ 1.05	$ 1.18
Diluted earnings per share (in dollars per share)	$ 0.67	$ 0.61	$ 1.05	$ 1.17
Weighted average common shares (basic) (in shares)	26,149,593	23,897,413	25,558,016	23,858,456
Common shares equivalents (in shares)	71,819	94,560	76,626	97,544
Weighted average common shares (diluted) (in shares)	26,221,412	23,991,973	25,634,642	23,956,000
Retained Earnings [Member]
Noninterest expenses
Net income			$ 26,910,000	$ 28,129,000
Cash dividends declared per common share (in dollars per share)	$ 0.26	$ 0.24	$ 0.52	$ 0.48