Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest income
Interest and fees on loans	$ 51,687	$ 48,204
Taxable interest and dividends on securities	4,627	4,650
Nontaxable interest and dividends on securities	34	37
Interest on loans held for sale	51	51
Interest on federal funds sold and short-term investments	30	38
Total interest and dividend income	56,429	52,980
Interest expense
Interest on deposits	2,763	2,791
Interest on borrowings	2,417	2,583
Total interest expense	5,180	5,374
Net interest income	51,249	47,606
Provision (benefit) for loan losses	(500)	4,502
Net interest income after provision for loan losses	51,749	43,104
Noninterest income
Deposit account fees	4,166	4,359
Interchange and ATM fees	3,100	2,975
Investment management	5,107	4,603
Mortgage banking income	1,126	487
Loan level derivative income	418	746
Increase in cash surrender value of life insurance policies	778	722
Gain Realized on Life Insurance Policies	0	1,627
Gain (Loss) on Sale of Equity Investments	0	91
Other noninterest income	1,862	1,906
Total noninterest income	16,557	17,516
Noninterest expenses
Salaries and employee benefits	25,288	23,080
Occupancy and equipment expenses	6,394	6,146
Data processing & facilities management	1,122	1,253
FDIC assessment	956	905
Advertising expense	834	824
Consulting expense	755	559
Business Combination, Acquisition Related Costs	10,230	77
Software maintenance	625	662
Other noninterest expenses	8,773	8,381
Total noninterest expenses	54,977	41,887
Income before income taxes	13,329	18,733
Provision for income taxes	3,869	5,350
Net income	9,460	13,383
Basic earnings per share (in dollars per share)	$ 0.38	$ 0.56
Diluted earnings per share (in dollars per share)	$ 0.38	$ 0.56
Weighted average common shares (basic) (in shares)	24,959,865	23,819,065
Common shares equivalents (in shares)	80,215	100,173
Weighted average common shares (diluted) (in shares)	25,040,080	23,919,238
Retained Earnings [Member]
Noninterest expenses
Net income	$ 9,460	$ 13,383
Cash dividends declared per common share (in dollars per share)	$ 0.26	$ 0.24