Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income
Interest and fees on loans	$ 175,046	$ 110,470	$ 404,457	$ 266,460
Interest on taxable securities	11,354	8,792	29,780	20,320
Interest on nontaxable securities	168	204	426	705
Interest on deposits in other banks and federal funds sold	1,793	1,653	7,655	3,092
Total interest income	188,361	121,119	442,318	290,577
Interest expense
Interest on deposits	29,425	15,630	74,563	30,196
Interest on other borrowings	10,167	6,451	17,940	16,543
Total interest expense	39,592	22,081	92,503	46,739
Net interest income	148,769	99,038	349,815	243,838
Provision for loan losses	5,989	2,095	14,065	13,006
Net interest income after provision for loan losses	142,780	96,943	335,750	230,832
Noninterest income
Service charges on deposit accounts	13,411	12,690	37,225	33,531
Mortgage banking activity	53,041	14,082	86,241	41,771
Other service charges, commissions and fees	1,236	790	2,828	2,236
Net gain (loss) on securities	4	48	139	(38)
Other noninterest income	9,301	2,561	16,567	10,442
Total noninterest income	76,993	30,171	143,000	87,942
Noninterest expense
Salaries and employee benefits	77,633	38,414	154,296	110,163
Occupancy and equipment expense	12,639	8,598	28,677	21,186
Data processing and communications expenses	10,372	8,518	27,151	22,092
Credit resolution-related expenses	1,094	1,248	2,984	2,842
Advertising and marketing expense	1,949	1,453	5,677	3,938
Amortization of intangible assets	5,719	2,676	11,972	5,862
Merger and conversion charges	65,158	276	70,690	19,502
Other noninterest expenses	18,133	11,170	47,926	32,252
Total noninterest expense	192,697	72,353	349,373	217,837
Income before income tax expense	27,076	54,761	129,377	100,937
Income tax expense	5,692	13,317	29,184	23,446
Net income	21,384	41,444	100,193	77,491
Other comprehensive income (loss)
Net unrealized holding gains (losses) arising during period on investment securities available for sale, net of tax expense (benefit) of ($244), ($1,053), $5,549 and ($4,035)	(921)	(3,964)	20,873	(15,181)
Reclassification adjustment for gains on investment securities included in earnings, net of tax of $0, $11, $25 and $19	0	(41)	(94)	(70)
Unrealized gains (losses) on cash flow hedges arising during period, net of tax expense (benefit) of ($15), $0, ($125) and $92	(59)	0	(471)	347
Other comprehensive income (loss)	(980)	(4,005)	20,308	(14,904)
Total comprehensive income	$ 20,404	$ 37,439	$ 120,501	$ 62,587
Basic earnings per common share (in dollars per share)	$ 0.31	$ 0.87	$ 1.83	$ 1.86
Diluted earnings per common share (in dollars per share)	$ 0.31	$ 0.87	$ 1.83	$ 1.85
Weighted average common shares outstanding (in thousands)
Basic (in shares)	69,372	47,515	54,762	41,673
Diluted (in shares)	69,600	47,685	54,883	41,845