Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
Interest and fees on loans	$ 87,466	$ 66,589
Interest and dividends on investment securities	20,854	18,561
Other interest income	237	72
Total interest income	108,557	85,222
Interest expense:
Interest on deposits	23,649	13,518
Interest on borrowings	2,725	2,034
Total interest expense	26,374	15,552
Net interest income	82,183	69,670
Provision for loan losses	2,076	1,643
Net interest income after provision for loan losses	80,107	68,027
Noninterest income:
Service charges and fees	1,054	915
Loan and other fees	4,900	2,495
Bank-owned life insurance income	1,367	1,414
Income from resolution of acquired assets	74	762
Gain on sales of other real estate owned	105	45
Gain (loss) on investment securities	(1,404)	777
Other noninterest income	1,127	3,579
Total noninterest income	7,223	9,987
Noninterest expense:
Salaries and employee benefits	21,945	20,497
Occupancy and equipment expenses	3,558	3,397
Loan and other real estate related expenses	1,111	1,227
Professional services	2,265	1,352
Data processing and network	3,566	2,965
Regulatory assessments and insurance	2,497	2,177
Amortization of intangibles	294	256
Marketing and promotions	1,757	1,346
Other operating expenses	2,168	1,867
Total noninterest expense	39,161	35,084
Income before income tax expense	48,169	42,930
Income tax expense	8,070	3,941
Net income	$ 40,099	$ 38,989
Earnings per share:
Basic (usd per share)	$ 0.89	$ 0.93
Diluted (usd per share)	$ 0.84	$ 0.86
Weighted average shares outstanding:
Basic (shares)	45,239,988	41,730,610
Diluted (shares)	47,579,309	45,573,216