Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest income
Interest and fees on loans	$ 175,345	$ 117,010	$ 346,587	$ 229,411
Interest on taxable securities	9,347	9,383	19,429	18,426
Interest on nontaxable securities	157	102	314	258
Interest on deposits in other banks and federal funds sold	169	2,533	1,456	5,862
Total interest income	185,018	129,028	367,786	253,957
Interest expense
Interest on deposits	14,273	23,454	38,375	45,138
Interest on other borrowings	6,931	3,923	17,652	7,773
Total interest expense	21,204	27,377	56,027	52,911
Net interest income	163,814	101,651	311,759	201,046
Provision for loan losses	68,449	4,668	105,496	8,076
Provision for unfunded commitments	19,712	0	23,712	0
Provision for credit losses	88,161	4,668	129,208	8,076
Net interest income after provision for credit losses	75,653	96,983	182,551	192,970
Noninterest income
Service charges on deposit accounts	9,922	12,168	21,766	23,814
Mortgage banking activity	104,925	18,523	140,258	33,200
Other service charges, commissions and fees	1,130	803	2,258	1,592
Net gain on securities	14	69	5	135
Other noninterest income	4,969	3,673	11,052	7,266
Total noninterest income	120,960	35,236	175,339	66,007
Noninterest expense
Salaries and employee benefits	95,168	38,331	171,114	76,663
Occupancy and equipment expense	13,807	7,834	25,835	16,038
Data processing and communications expenses	10,514	8,388	22,468	16,779
Credit resolution-related expenses	950	979	3,148	1,890
Advertising and marketing expense	1,455	1,987	3,813	3,728
Amortization of intangible assets	5,601	3,121	11,232	6,253
Merger and conversion charges	895	3,475	1,435	5,532
Other noninterest expenses	27,378	17,136	54,776	29,793
Total noninterest expense	155,768	81,251	293,821	156,676
Income before income tax expense	40,845	50,968	64,069	102,301
Income tax expense	8,609	12,064	12,511	23,492
Net income	32,236	38,904	51,558	78,809
Other comprehensive income
Net unrealized holding gains (losses) arising during period on investment securities available for sale, net of tax expense (benefit) of $(13), $4,765, $5,743 and $5,793	(49)	17,927	21,604	21,794
Reclassification adjustment for gains on investment securities included in earnings, net of tax of $0, $13, $0 and $25	0	(48)	0	(94)
Unrealized gains (losses) on cash flow hedges arising during period, net of tax expense (benefit) of $30, $(64), $4 and $(110)	111	(239)	14	(412)
Other comprehensive income	62	17,640	21,618	21,288
Total comprehensive income	$ 32,298	$ 56,544	$ 73,176	$ 100,097
Basic earnings per common share (in dollars per share)	$ 0.47	$ 0.82	$ 0.74	$ 1.66
Diluted earnings per common share (in dollars per share)	$ 0.47	$ 0.82	$ 0.74	$ 1.66
Weighted average common shares outstanding (in thousands)
Basic (in shares)	69,192	47,311	69,235	47,354
Diluted (in shares)	69,293	47,338	69,413	47,395