Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income
Interest and fees on loans	$ 197,021	$ 189,748	$ 178,309
Taxable interest and dividends on securities	18,610	15,137	16,681
Nontaxable interest and dividends on securities	144	55	82
Interest on loans held for sale	405	774	988
Interest on federal funds sold and short-term investments	279	200	132
Total interest and dividend income	216,459	205,914	196,192
Interest expense
Interest on deposits	11,039	10,624	10,703
Interest on borrowings	9,378	12,712	12,690
Total interest expense	20,417	23,336	23,393
Net interest income	196,042	182,578	172,799
Provision	10,403	10,200	18,056
Net interest income after provision for loan losses	185,639	172,378	154,743
Noninterest income
Deposit account fees	18,065	17,940	15,930
Interchange and ATM fees	12,975	10,883	9,783
Investment management	19,642	16,832	14,779
Mortgage banking income	3,384	6,734	6,500
Increase in cash surrender value of life insurance policies	3,128	3,229	3,114
Gain on life insurance benefits	1,964	227	1,307
Gains (Losses) on Extinguishment of Debt	0	763	0
Loan level derivative income	2,477	3,439	3,457
Available-for-sale Securities, Gross Realized Gains	121	258	5
Gain (Loss) on Sale of Equity Investments	91	(28)	111
Other noninterest income	8,096	7,732	7,030
Total noninterest income	69,943	68,009	62,016
Noninterest expenses
Salaries and employee benefits	94,044	89,894	84,014
Occupancy and equipment expenses	21,820	19,650	17,307
Data processing & facilities management	4,765	4,748	4,644
FDIC assessment	3,770	3,579	3,232
Advertising expense	3,859	4,280	3,949
Consulting expense	2,923	3,322	2,801
Debit Card	2,362	2,994	2,510
Goodwill impairment			2,227	[1]
Available-for-sale Securities, Gross Realized Losses	21	0	0
Merger and acquisition expense	1,339	8,685	6,741
Prepayment fee on borrowings			7
Other noninterest expenses	36,935	36,497	32,027
Total noninterest expenses	171,838	173,649	159,459
Income before income taxes	83,744	66,738	57,300
Provision for income taxes	23,899	16,484	14,673
Net Income	$ 59,845	$ 50,254	$ 42,627
Basic earnings per share (in dollars per share)	$ 2.50	$ 2.18	$ 1.96
Diluted earnings per share (in dollars per share)	$ 2.49	$ 2.18	$ 1.95
Weighted average common shares (basic) (in shares)	23,899,562	23,011,814	21,782,499
Common share equivalents (in shares)	93,815	76,764	29,817
Weighted average common shares (diluted) (in shares)	23,993,377	23,088,578	21,812,316
Cash dividends declared (in dollars per share)	$ 0.96	$ 0.88	$ 0.84

[1] Amount represents the total amount of goodwill relating to Compass Exchange Advisors, LLC, which was acquired in January 2007.