Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income
Interest and fees on loans	$ 82,723	$ 65,464	$ 155,990	$ 126,985
Interest on taxable securities	6,321	5,195	11,528	9,995
Interest on nontaxable securities	179	401	501	817
Interest on deposits in other banks and federal funds sold	723	351	1,439	664
Total interest income	89,946	71,411	169,458	138,461
Interest expense
Interest on deposits	7,794	4,580	14,566	8,343
Interest on other borrowings	6,153	3,674	10,092	6,371
Total interest expense	13,947	8,254	24,658	14,714
Net interest income	75,999	63,157	144,800	123,747
Provision for loan losses	9,110	2,205	10,911	4,041
Net interest income after provision for loan losses	66,889	60,952	133,889	119,706
Noninterest income
Service charges on deposit accounts	10,613	10,616	20,841	21,179
Mortgage banking activity	14,890	13,943	26,790	25,158
Other service charges, commissions and fees	697	729	1,416	1,438
Gain (loss) on securities	(123)	37	(86)	37
Other noninterest income	5,230	2,864	8,810	6,083
Total noninterest income	31,307	28,189	57,771	53,895
Noninterest expense
Salaries and employee benefits	39,776	29,132	71,865	56,926
Occupancy and equipment expense	6,390	6,146	12,588	12,023
Data processing and communications costs	6,439	7,028	13,574	13,600
Credit resolution-related expenses	1,045	599	1,594	1,532
Advertising and marketing expense	1,256	1,259	2,485	2,365
Amortization of intangible assets	2,252	1,013	3,186	2,049
Merger and conversion charges	18,391	0	19,226	402
Other noninterest expenses	10,837	10,562	20,966	19,935
Total noninterest expense	86,386	55,739	145,484	108,832
Income before income tax expense	11,810	33,402	46,176	64,769
Income tax expense	2,423	10,315	10,129	20,529
Net income	9,387	23,087	36,047	44,240
Other comprehensive income
Net unrealized holding gains (losses) arising during period on investment securities available for sale, net of tax expense (benefit) of ($482), $1,487, ($2,982) and $1,382	(1,814)	2,760	(11,217)	2,566
Reclassification adjustment for gains on investment securities included in earnings, net of tax of $0, $13, $8 and $13	0	(24)	(29)	(24)
Unrealized gains (losses) on cash flow hedges arising during period, net of tax expense (benefit) of $17, ($58), $92 and ($35)	66	(106)	347	(63)
Other comprehensive income (loss)	(1,748)	2,630	(10,899)	2,479
Total comprehensive income	$ 7,639	$ 25,717	$ 25,148	$ 46,719
Basic earnings per common share (in dollars per share)	$ 0.24	$ 0.62	$ 0.93	$ 1.21
Diluted earnings per common share (in dollars per share)	0.24	0.62	0.92	1.20
Dividends declared per common share (in dollars per share)	$ 0.10	$ 0.10	$ 0.20	$ 0.20
Weighted average common shares outstanding (in thousands)
Basic (in shares)	39,432	37,163	38,703	36,418
Diluted (in shares)	39,710	37,489	38,981	36,744