Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest income
Interest and fees on loans	$ 54,269,000	$ 51,687,000
Taxable interest and dividends on securities	5,197,000	4,627,000
Nontaxable interest and dividends on securities	32,000	34,000
Interest on loans held for sale	32,000	51,000
Interest on federal funds sold and short-term investments	211,000	30,000
Total interest and dividend income	59,741,000	56,429,000
Interest expense
Interest on deposits	2,868,000	2,763,000
Interest on borrowings	1,982,000	2,417,000
Total interest expense	4,850,000	5,180,000
Net interest income	54,891,000	51,249,000
Provision (benefit) for loan losses	525,000	(500,000)
Net interest income after provision (benefit) for loan losses	54,366,000	51,749,000
Noninterest income
Deposit account fees	4,470,000	4,166,000
Interchange and ATM fees	3,724,000	3,100,000
Investment management	5,003,000	5,107,000
Mortgage banking income	1,132,000	1,126,000
Loan level derivative income	1,722,000	418,000
Increase in cash surrender value of life insurance policies	1,014,000	778,000
Other noninterest income	2,090,000	1,862,000
Total noninterest income	19,155,000	16,557,000
Noninterest expenses
Salaries and employee benefits	27,189,000	25,288,000
Occupancy and equipment expenses	5,827,000	6,394,000
Data processing & facilities management	1,206,000	1,122,000
FDIC assessment	1,010,000	956,000
Advertising expense	1,257,000	834,000
Consulting expense	601,000	755,000
Loss on extinguishment of debt	437,000	122,000
Available-For-Sale Securities - Equity Gross Realized Losses	29,000	0
Business Combination, Acquisition Related Costs	334,000	10,230,000
Software Maintenance	754,000	625,000
Other noninterest expenses	7,838,000	8,651,000
Total noninterest expenses	46,482,000	54,977,000
Income before income taxes	27,039,000	13,329,000
Provision for income taxes	8,428,000	3,869,000
Net income	$ 18,611,000	$ 9,460,000
Basic earnings per share (in dollars per share)	$ 0.71	$ 0.38
Diluted earnings per share (in dollars per share)	$ 0.71	$ 0.38
Weighted average common shares (basic) (in shares)	26,275,323	24,959,865
Common shares equivalents (in shares)	43,409	80,215
Weighted average common shares (diluted) (in shares)	26,318,732	25,040,080
Cash dividends declared per common share (in dollars per share)	$ 0.29	$ 0.26
Retained Earnings [Member]
Noninterest expenses
Net income	$ 18,611,000	$ 9,460,000
Cash dividends declared per common share (in dollars per share)	$ 0.29	$ 0.26