Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest, fee, and dividend income
Interest and fees on loans	$ 61,773	$ 53,817	$ 177,499	$ 154,534
Securities available for sale	6,520	6,550	18,803	21,024
Securities held to maturity	804	572	1,877	1,829
Other	472	348	1,363	1,153
Total interest, fee, and dividend income	69,569	61,287	199,542	178,540
Interest expense
Deposits	3,999	4,544	12,445	14,521
Short-term borrowings	232	60	341	149
Long-term debt	2,561	3,640	9,196	10,801
Trust preferred debentures	551	436	1,539	1,319
Total interest expense	7,343	8,680	23,521	26,790
Net interest income	62,226	52,607	176,021	151,750
Provision for loan losses	5,198	4,755	17,258	13,329
Net interest income after provision for loan losses	57,028	47,852	158,763	138,421
Noninterest income
Insurance and other financial services revenue	6,038	5,591	18,686	17,024
Service charges on deposit accounts	5,055	4,626	14,311	13,538
ATM and debit card fees	4,276	3,378	11,562	9,403
Retirement plan administration fees	3,062	2,718	8,701	7,462
Trust	4,345	2,242	11,957	6,683
Bank owned life insurance	913	639	2,648	2,228
Net securities gains	329	26	1,413	578
Other	3,129	2,407	8,635	8,449
Total noninterest income	27,147	21,627	77,913	65,365
Noninterest expense
Salaries and employee benefits	29,267	26,641	85,474	78,358
Occupancy	5,262	4,437	15,458	13,150
Data processing and communications	4,059	3,352	11,368	10,041
Professional fees and outside services	3,202	2,735	9,340	7,848
Equipment	2,988	2,435	8,480	7,224
Office supplies and postage	1,640	1,597	4,886	4,842
FDIC expenses	1,285	939	3,688	2,812
Advertising	722	701	2,445	2,308
Amortization of intangible assets	1,346	870	3,548	2,530
Loan collection and other real estate owned	886	614	2,025	2,051
Merger expenses	326	558	12,276	1,895
Other	5,303	4,552	14,453	12,236
Total noninterest expense	56,286	49,431	173,441	145,295
Income before income tax expense	27,889	20,048	63,235	58,491
Income tax expense	8,632	5,513	19,413	17,049
Net income	$ 19,257	$ 14,535	$ 43,822	$ 41,442
Earnings per share
Basic (in dollars per share)	$ 0.44	$ 0.43	$ 1.06	$ 1.24
Diluted (in dollars per share)	$ 0.44	$ 0.43	$ 1.05	$ 1.23