Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest income
Interest and fees on loans	$ 117,497	$ 119,310	$ 128,841
Interest on taxable securities	7,134	8,250	10,254
Interest on nontaxable securities	1,413	1,475	1,321
Interest on deposits in other banks	276	434	617
Interest on federal funds sold	2	10	38
Total interest income	126,322	129,479	141,071
Interest expense
Interest on deposits	8,400	13,327	25,506
Interest on other borrowings	1,737	1,747	2,041
Total interest expense	10,137	15,074	27,547
Net interest income	116,185	114,405	113,524
Provision for loan losses	11,486	31,089	32,729
Net interest income after provision for loan losses	104,699	83,316	80,795
Other income
Service charges on deposit accounts	19,545	19,576	18,081
Mortgage banking activity	19,128	12,989	2,971
Other service charges, commissions and fees	2,151	1,431	1,247
Gain on sales of securities	171	322	238
Gain on acquisitions		20,037	26,867
Other	5,554	3,519	3,403
Total other income	46,549	57,874	52,807
Other expenses
Salaries and employee benefits	56,670	53,122	40,210
Occupancy and equipment	12,286	13,208	11,390
Advertising and marketing	1,620	1,622	722
Amortization of intangible assets	1,414	1,359	1,011
Data processing and communications	11,539	10,683	10,315
Other	38,416	39,476	38,305
Total noninterest expense	121,945	119,470	101,953
Income before income tax expense	29,303	21,720	31,649
Applicable income tax expense	(9,285)	(7,285)	(10,556)
Net income	20,018	14,435	21,093
Preferred stock dividends	1,738	3,577	3,241
Net income available to common stockholders	$ 18,280	$ 10,858	$ 17,852
Basic income per share	$ 0.76	$ 0.46	$ 0.76
Diluted income per share	$ 0.75	$ 0.46	$ 0.76