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	$ 150,611	$ 117,497	$ 119,310
Interest on taxable securities	12,086	7,134	8,250
Interest on nontaxable securities	1,626	1,413	1,475
Interest on deposits in other banks	236	276	434
Interest on federal funds sold	7	2	10
Total interest income	164,566	126,322	129,479
Interest expense
Interest on deposits	9,488	8,400	13,327
Interest on other borrowings	5,192	1,737	1,747
Total interest expense	14,680	10,137	15,074
Net interest income	149,886	116,185	114,405
Provision for loan losses	5,648	11,486	31,089
Net interest income after provision for loan losses	144,238	104,699	83,316
Other income
Service charges on deposit accounts	24,614	19,545	19,576
Mortgage banking activity	25,986	19,128	12,989
Other service charges, commissions and fees	2,647	2,151	1,431
Net gains on sales of securities	138	171	322
Gain on acquisitions			20,037
Gain on sale of SBA loans	3,896	1,500	264
Other noninterest income	5,555	4,054	3,255
Total noninterest income	62,836	46,549	57,874
Other expenses
Salaries and employee benefits	73,878	56,670	53,122
Occupancy and equipment	17,521	12,286	13,208
Advertising and marketing	2,869	1,620	1,622
Amortization of intangible assets	2,330	1,414	1,359
Data processing and communications expenses	15,551	11,539	10,683
Credit resolution related expenses	13,506	15,486	22,416
Merger and conversion charges	3,940	4,350	2,125
Other noninterest expenses	21,274	18,580	14,935
Total noninterest expense	150,869	121,945	119,470
Income before income tax expense	56,205	29,303	21,720
Income tax expense	(17,482)	(9,285)	(7,285)
Net income	38,723	20,018	14,435
Preferred stock dividends	286	1,738	3,577
Net income available to common stockholders	$ 38,437	$ 18,280	$ 10,858
Basic earnings per common share	$ 1.48	$ 0.76	$ 0.46
Diluted earnings per common share	$ 1.46	$ 0.75	$ 0.46
Dividends declared per common share	$ 0.15
Weighted average common shares outstanding
Basic	25,974	23,918	23,802
Diluted	26,259	24,348	23,843