Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income
Interest and fees on loans	$ 61,521	$ 49,191
Interest on taxable securities	4,800	4,586
Interest on nontaxable securities	416	446
Interest on deposits in other banks and federal funds sold	313	336
Total interest income	67,050	54,559
Interest expense
Interest on deposits	3,763	2,741
Interest on other borrowings	2,697	1,382
Total interest expense	6,460	4,123
Net interest income	60,590	50,436
Provision for loan losses	1,836	681
Net interest income after provision for loan losses	58,754	49,755
Noninterest income
Service charges on deposit accounts	10,563	9,915
Mortgage banking activity	11,215	10,211
Other service charges, commissions and fees	709	1,111
Net gains on sales of securities	0	94
Other noninterest income	3,219	2,955
Total noninterest income	25,706	24,286
Noninterest expense
Salaries and employee benefits	27,794	26,187
Occupancy and equipment expense	5,877	5,700
Data processing and communications costs	6,572	6,113
Credit resolution-related expenses	933	1,799
Advertising and marketing expense	1,106	805
Amortization of intangible assets	1,036	1,020
Merger and conversion charges	402	6,359
Other noninterest expenses	9,373	7,617
Total noninterest expense	53,093	55,600
Income before income tax expense	31,367	18,441
Income tax expense	10,214	6,124
Net income	21,153	12,317
Other comprehensive income (loss)
Net unrealized holding gains (losses) arising during period on investment securities available for sale, net of tax expense (benefit) of ($105) and $2,011	(194)	3,734
Reclassification adjustment for gains on investment securities included in earnings, net of tax of $0 and $33	0	(61)
Unrealized gains (losses) on cash flow hedges arising during period, net of tax expense (benefit) of $23 and ($331)	43	(615)
Total other comprehensive income (loss)	(151)	3,058
Comprehensive income	$ 21,002	$ 15,375
Basic earnings per common share	$ 0.59	$ 0.38
Diluted earnings per common share	0.59	0.37
Dividends declared per common share	$ 0.10	$ 0.05
Weighted average common shares outstanding (in thousands)
Basic	35,664	32,752
Diluted	36,040	33,054