United Bankshares (UBSI) 10-Q 10 Aug 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Fiscal Year Focus	2020
Document Period End Date	Jun. 30, 2020
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Registrant Name	UNITED BANKSHARES INC/WV
Entity Central Index Key	0000729986
Entity Current Reporting Status	Yes
Trading Symbol	UBSI
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		129,755,424
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock
Entity File Number	002-86947
Security Exchange Name	NASDAQ
Entity Tax Identification Number	55-0641179
Entity Address, Address Line One	300 United Center
Entity Address, Address Line Two	500 Virginia Street, East
Entity Address, City or Town	Charleston
Entity Address, State or Province	WV
Entity Address, Postal Zip Code	25301
City Area Code	304
Local Phone Number	424-8716
Entity Incorporation, State or Country Code	WV

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 274,293	$ 185,238
Interest-bearing deposits with other banks	1,787,697	651,435
Federal funds sold	823	820
Total cash and cash equivalents	2,062,813	837,493
Securities available for sale at estimated fair value (amortized cost-$2,730,350 at June 30, 2020 and $2,426,924 at December 31, 2019, allowance for credit losses of $0 at June 30, 2020)	2,799,941	2,437,296
Securities held to maturity, net of allowance for credit losses of $14 at June 30, 2020 (estimated fair value-$1,220 at June 30, 2020 and $1,447 at December 31, 2019)	1,221	1,446
Equity securities at estimated fair value	9,875	8,894
Other investment securities	251,161	222,161
Loans held for sale (at fair value-$611,277 at June 30, 2020 and $384,375 at December 31, 2019)	625,984	387,514
Loans and leases	18,032,554	13,713,548
Less: Unearned income	(40,152)	(1,419)
Loans and leases, net of unearned income	17,992,402	13,712,129
Less: Allowance for loan and lease losses	(215,121)	(77,057)
Net loans and leases	17,777,281	13,635,072
Bank premises and equipment	181,238	96,644
Operating lease right-of-use assets	70,655	57,783
Goodwill	1,794,779	1,478,014
Mortgage servicing rights, net of valuation allowance	20,200	0
Accrued interest receivable	67,761	58,085
Other assets	572,064	441,922
TOTAL ASSETS	26,234,973	19,662,324
Deposits:
Noninterest-bearing	7,096,574	4,621,362
Interest-bearing	12,797,269	9,231,059
Total deposits	19,893,843	13,852,421
Borrowings:
Securities sold under agreements to repurchase	176,168	124,654
Federal Home Loan Bank ("FHLB")borrowings	1,354,879	1,851,865
Other long-term borrowings	279,012	236,164
Reserve for lending-related commitments	11,946	1,733
Operating lease liabilities	74,435	61,342
Accrued expenses and other liabilities	246,835	170,312
TOTAL LIABILITIES	22,037,118	16,298,491
Shareholders' Equity
Preferred stock, $1.00 par value; Authorized-50,000,000 shares, none issued	0	0
Common stock, $2.50 par value; Authorized-200,000,000 shares; issued-133,716,280 and 105,494,290 at June 30, 2020 and December 31, 2019, respectively, including 3,960,885 and 3,940,619 shares in treasury at June 30, 2020 and December 31, 2019, respectively	334,291	263,736
Surplus	2,890,394	2,140,175
Retained earnings	1,100,097	1,132,579
Accumulated other comprehensive gain (loss)	11,504	(34,869)
Treasury stock, at cost	(138,431)	(137,788)
TOTAL SHAREHOLDERS' EQUITY	4,197,855	3,363,833
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 26,234,973	$ 19,662,324

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 2,730,350	$ 2,426,924
Securities held to maturity	1,220	1,447
Loans held for sale at fair value	$ 611,277	$ 384,375
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	133,716,280	105,494,290
Common stock, shares in treasury	3,960,885	3,940,619

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ 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	$ 179,311	$ 175,130	$ 338,165	$ 340,001
Interest on federal funds sold and other short-term investments	1,868	5,405	5,833	11,242
Interest and dividends on securities:
Taxable	16,241	17,748	33,210	35,111
Tax-exempt	1,297	962	1,991	1,988
Total interest income	198,717	199,245	379,199	388,342
Interest expense
Interest on deposits	19,249	35,455	46,726	68,093
Interest on short-term borrowings	196	608	654	1,299
Interest on long-term borrowings	8,670	12,629	19,699	24,229
Total interest expense	28,115	48,692	67,079	93,621
Net interest income	170,602	150,553	312,120	294,721
Provision for credit losses	45,911	5,417	73,030	10,413
Net interest income after provision for credit losses	124,691	145,136	239,090	284,308
Other income
Income from bank-owned life insurance	1,291	1,326	3,679	3,153
Mortgage loan servicing income	1,534	0	1,534	0
Net investment securities gains (losses)	1,510	109	1,706	(50)
Other income	547	310	1,271	666
Total other income	88,390	39,795	125,196	71,018
Other expense
Employee compensation	68,664	44,301	113,205	83,250
Employee benefits	12,779	8,578	23,565	18,009
Net occupancy expense	10,318	8,667	19,380	17,418
Other real estate owned ("OREO") expense	607	633	1,513	2,049
Equipment expense	5,004	3,675	8,849	6,990
Data processing expense	15,926	5,567	21,432	10,729
Mortgage loan servicing expense and impairment	2,510	106	2,648	197
Bankcard processing expense	392	448	869	928
FDIC insurance expense	2,782	3,300	5,182	6,600
FHLB prepayment penalties	0	5,105	0	5,105
Other expense	30,392	19,815	53,864	38,345
Total other expense	149,374	100,195	250,507	189,620
Income before income taxes	63,707	84,736	113,779	165,706
Income taxes	11,021	17,529	20,910	34,857
Net income	$ 52,686	$ 67,207	$ 92,869	$ 130,849
Earnings per common share:
Basic	$ 0.44	$ 0.66	$ 0.84	$ 1.28
Diluted	$ 0.44	$ 0.66	$ 0.84	$ 1.28
Average outstanding shares:
Basic	119,823,652	101,773,643	110,559,363	101,833,880
Diluted	119,887,823	102,047,845	110,624,976	102,099,809
Fees From Trust Services [Member]
Other income
Revenue from contract	$ 3,261	$ 3,438	$ 6,744	$ 6,702
Fees from Brokerage Services [Member]
Other income
Revenue from contract	2,651	2,766	5,567	5,290
Fees from Deposit Services [Member]
Other income
Revenue from contract	8,055	8,464	16,012	16,517
Bankcard Fees and Merchant Discounts [Member]
Other income
Revenue from contract	718	1,102	1,711	2,258
Other Service Charges, Commissions, and Fees [Member]
Other income
Revenue from contract	610	576	1,128	1,097
Mortgage Banking [Member]
Other income
Revenue from contract	$ 68,213	$ 21,704	$ 85,844	$ 35,385

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 52,686	$ 67,207	$ 92,869	$ 130,849
Change in net unrealized gain on available-for-sale ("AFS") securities, net of tax	27,834	17,994	45,420	34,783
Change in net unrealized loss on cash flow hedge, net of tax	(1,272)	0	(1,272)	0
Change in pension plan assets, net of tax	1,113	909	2,225	1,819
Comprehensive income, net of tax	$ 80,361	$ 86,110	$ 139,242	$ 167,451

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Revision of Prior Period, Reclassification, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Common Stock [Member]Revision of Prior Period, Reclassification, Adjustment [Member]	Common Stock [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Surplus [Member]	Surplus [Member]Revision of Prior Period, Reclassification, Adjustment [Member]	Surplus [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Retained Earnings [Member]Revision of Prior Period, Reclassification, Adjustment [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]Revision of Prior Period, Reclassification, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Treasury Stock [Member]Revision of Prior Period, Reclassification, Adjustment [Member]	Treasury Stock [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning Balance at Dec. 31, 2018	$ 3,251,624	$ 50	$ (1,049)	$ 263,098	$ 0	$ 0	$ 2,134,462	$ 0	$ 0	$ 1,013,037	$ 0	$ (1,049)	$ (57,019)	$ 50	$ 0	$ (101,954)	$ 0	$ 0
Beginning Balance, shares at Dec. 31, 2018				105,239,121
Net income	63,642			$ 0			0			63,642			0			0
Other comprehensive income, net of tax	17,699			0			0			0			17,699			0
Comprehensive income, net of tax	81,341
Stock based compensation expense	1,113			0			1,113			0			0			0
Purchase of treasury stock	(12,072)			0			0			0			0			(12,072)
Cash dividends	(34,759)			0			0			(34,759)			0			0
Grant of restricted stock	0			$ 316			(316)			0			0			0
Grant of restricted stock, shares				126,427
Common stock options exercised	643			$ 84			559			0			0			0
Common stock options exercised, shares				33,816
Ending Balance at Mar. 31, 2019	3,286,891			$ 263,498			2,135,818			1,040,871			(39,270)			(114,026)
Ending Balance, shares at Mar. 31, 2019				105,399,364
Beginning Balance at Dec. 31, 2018	3,251,624	$ 50	(1,049)	$ 263,098	$ 0	0	2,134,462	$ 0	0	1,013,037	$ 0	(1,049)	(57,019)	$ 50	0	(101,954)	$ 0	0
Beginning Balance, shares at Dec. 31, 2018				105,239,121
Net income	130,849
Other comprehensive income, net of tax	36,602
Comprehensive income, net of tax	$ 167,451
Common stock options exercised, shares	47,960
Ending Balance at Jun. 30, 2019	$ 3,333,858			$ 263,534			2,137,459			1,073,390			(20,367)			(120,158)
Ending Balance, shares at Jun. 30, 2019				105,413,508
Beginning Balance at Mar. 31, 2019	3,286,891			$ 263,498			2,135,818			1,040,871			(39,270)			(114,026)
Beginning Balance, shares at Mar. 31, 2019				105,399,364
Net income	67,207			$ 0			0			67,207			0			0
Other comprehensive income, net of tax	18,903			0			0			0			18,903			0
Comprehensive income, net of tax	86,110
Stock based compensation expense	1,198			0			1,198			0			0			0
Purchase of treasury stock	(6,032)			0			0			0			0			(6,032)
Cash dividends	(34,688)			0			0			(34,688)			0			0
Forfeiture of restricted stock	0			0			100			0			0			(100)
Common stock options exercised	379			$ 36			343			0			0			0
Common stock options exercised, shares				14,144
Ending Balance at Jun. 30, 2019	3,333,858			$ 263,534			2,137,459			1,073,390			(20,367)			(120,158)
Ending Balance, shares at Jun. 30, 2019				105,413,508
Beginning Balance at Dec. 31, 2019	$ 3,363,833		(44,331)	$ 263,736		0	2,140,175		0	1,132,579		(44,331)	(34,869)		0	(137,788)		0
Beginning Balance, shares at Dec. 31, 2019				105,494,290
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Net income	$ 40,183			$ 0			0			40,183			0			0
Other comprehensive income, net of tax	18,698			0			0			0			18,698			0
Comprehensive income, net of tax	58,881
Stock based compensation expense	1,253			0			1,253			0			0			0
Purchase of treasury stock	(608)			0			0			0			0			(608)
Cash dividends	(35,604)			0			0			(35,604)			0			0
Grant of restricted stock	0			$ 439			(439)			0			0			0
Grant of restricted stock, shares				175,495
Forfeiture of restricted stock	0			$ 0			35			0			0			(35)
Common stock options exercised	278			$ 36			242			0			0			0
Common stock options exercised, shares				14,694
Ending Balance at Mar. 31, 2020	3,343,702			$ 264,211			2,141,266			1,092,827			(16,171)			(138,431)
Ending Balance, shares at Mar. 31, 2020				105,684,479
Beginning Balance at Dec. 31, 2019	3,363,833		$ (44,331)	$ 263,736		$ 0	2,140,175		$ 0	1,132,579		$ (44,331)	(34,869)		$ 0	(137,788)		$ 0
Beginning Balance, shares at Dec. 31, 2019				105,494,290
Net income	92,869
Other comprehensive income, net of tax	46,373												46,373
Comprehensive income, net of tax	$ 139,242
Common stock options exercised, shares	14,994
Ending Balance at Jun. 30, 2020	$ 4,197,855			$ 334,291			2,890,394			1,100,097			11,504			(138,431)
Ending Balance, shares at Jun. 30, 2020				133,716,280
Beginning Balance at Mar. 31, 2020	3,343,702			$ 264,211			2,141,266			1,092,827			(16,171)			(138,431)
Beginning Balance, shares at Mar. 31, 2020				105,684,479
Net income	52,686			$ 0			0			52,686			0			0
Other comprehensive income, net of tax	27,675			0			0			0			27,675			0
Comprehensive income, net of tax	80,361
Stock based compensation expense	1,369			0			1,369			0			0			0
Acquisition, Values	817,830			$ 70,079			747,751			0			0			0
Acquisition, Shares				28,031,501
Purchase of treasury stock	0			$ 0			0			0			0			0
Cash dividends	(45,416)			0			0			(45,416)			0			0
Common stock options exercised	9			$ 1			8			0			0			0
Common stock options exercised, shares				300
Ending Balance at Jun. 30, 2020	$ 4,197,855			$ 334,291			$ 2,890,394			$ 1,100,097			$ 11,504			$ (138,431)
Ending Balance, shares at Jun. 30, 2020				133,716,280

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Common Stock [Member]
Cash dividends per share	$ 0.35	$ 0.35	$ 0.34	$ 0.34
Grant of restricted stock, shares		175,495		126,427
Forfeiture of restricted stock, shares		946	2,539
Common stock options exercised, shares	300	14,694	14,144	33,816
Acquisition, Shares	28,031,501
Treasury Stock [Member]
Purchase of treasury stock, shares	6	19,314	166,604	365,702

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
OPERATING ACTIVITIES
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 72,099	$ 31,786
INVESTING ACTIVITIES
Proceeds from maturities and calls of securities held to maturity	210	2,000
Proceeds from sales of securities available for sale	164,850	248,187
Proceeds from maturities and calls of securities available for sale	248,856	136,576
Purchases of securities available for sale	(159,548)	(338,983)
Proceeds from sales of equity securities	1,042	1,497
Purchases of equity securities	(514)	(618)
Proceeds from sales and redemptions of other investment securities	97,177	50,271
Purchases of other investment securities	(110,191)	(75,228)
Redemption of bank-owned life insurance policies	1,186	2,829
Purchases of bank premises and equipment	(6,831)	(4,110)
Proceeds from sales of bank premises and equipment	278	251
Proceeds from the sales of OREO properties	5,106	3,870
Acquisition of Carolina Financial Corporation, net of cash paid	629,107	0
Net change in loans	(1,028,035)	(203,898)
NET CASH USED IN INVESTING ACTIVITIES	(157,307)	(177,356)
FINANCING ACTIVITIES
Cash dividends paid	(71,862)	(69,732)
Acquisition of treasury stock	(608)	(18,104)
Proceeds from exercise of stock options	288	1,020
Repayment of long-term Federal Home Loan Bank borrowings	(828,000)	(1,115,000)
Proceeds from issuance of long-term Federal Home Loan Bank borrowings	250,000	1,400,000
Changes in:
Deposits	2,159,196	409,731
Federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings	(198,486)	(229,168)
NET CASH PROVIDED BY FINANCING ACTIVITIES	1,310,528	378,747
Increase in cash and cash equivalents	1,225,320	233,177
Cash and cash equivalents at beginning of year	837,493	1,020,396
Cash and cash equivalents at end of period	2,062,813	1,253,573
Noncash investing activities:
Transfers of loans to OREO	18,925	3,133
Transfer of held to maturity debt securities to available for sale debt securities	$ 0	$ 11,544

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying unaudited consolidated interim financial statements of United Bankshares, Inc. and Subsidiaries (“United” or “the Company”) have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States (GAAP) and with the instructions for Form 10-Q S-X. six-month 10-K, The accompanying consolidated interim financial statements include the accounts of United and its wholly owned subsidiaries. United operates in two business segments: community banking and mortgage banking. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements. Information is presented in these notes to the unaudited consolidated interim financial statements with dollars expressed in thousands, except per share or unless otherwise noted. New Accounting Standards In March 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2020-04, No. 2020-04 No. 2020-04 In February 2020, FASB issued ASU No. 2020-03, No. 2020-03 No. 2020-03 did In January 2020, the FASB issued ASU No. 2020-01, between Topic 321, Topic 323, and Topic 815. The new guidance addresses accounting for the transition into and out of the equity method and measuring certain purchased options and forward contracts to acquire investments. ASU No. 2020-01 No. 2020-01 In November 2019, the FASB issued ASU No. 2019-08, No. 2019-08 No. 2019-08 In April 2019, the FASB issued ASU No. 2019-04 No. 2019-04 In August 2018, the FASB issued ASU No. 2018-14 715-20): No. 2018-14 No. 2018-14 In August 2018, the FASB issued ASU No. 2018-13 No. 2018-13 No. 2018-13 In August 2017, the FASB issued ASU No. 2017-12, classification. ASU No. 2017-12 one-time In January 2017, the FASB issued ASU No. 2017-04, 2017-04 2017-04 2017-04 In June 2016, the FASB issued ASU No. 2016-13, No. 2016-13 No. 2016-13 No. 2016-13 phase-in (COVID-19) No. 2016-13 No. 2016-13 In February 2016, the FASB issued ASU No. 2016-02, No. 2016-02 No. 2016-02 right-of-use No. 2018-11 non-lease non-lease No. 2018-10 2018-10 the standard using the modified retrospective transition method on January 1, 2019. The Company evaluated and elected the package of practical expedients, which allows for existing leases to be accounted for consistent with current guidance, with the exception of the balance sheet recognition for lessees. The Company has also elected the practical expedient on not separating lease and nonlease components and instead treating them as a single lease component. Adoption of the standard resulted in the recognition of additional net lease assets and lease liabilities of $67,040 and $70,692, respectively, as of January 1, 2019. Of the difference between these two amounts, $1,049 was recorded as an adjustment to retained earnings.

Mergers and Acquisitions

Mergers and Acquisitions	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Mergers and Acquisitions	2. MERGERS ACQUISITIONS On May 1, 2020 (“Acquisition Date”), United acquired 100% of the outstanding shares of Carolina Financial Corporation (“Carolina Financial”), a Delaware corporation headquartered in Charleston, South Carolina. Carolina Financial was merged with and into United (the “Merger”), pursuant to the terms of the Agreement and Plan of Merger, dated November 17, 2019, by and between United and Carolina Financial (the “Merger Agreement”). Upon completion of the Merger, Carolina Financial ceased to exist and United survived and continues to exist as a West Virginia corporation. Under the terms of the Merger Agreement, each outstanding share of common stock of Carolina Financial was converted into the right to receive 1.13 shares of United common stock, par value $2.50 per share. Also pursuant to the Merger Agreement, as of the effective time of the Merger, each outstanding Carolina Financial stock option, whether vested or unvested as of the date of the Merger, at such option holder’s election, (i) vested and converted into an option to acquire United common stock adjusted based on the 1.13 exchange ratio, or (ii) was entitled to receive cash consideration equal to the difference between (a) the option’s exercise price and (b) $28.99, representing the volume weighted average trading price of the Carolina Financial common stock on NASDAQ for the twenty full trading days ending on the second trading day immediately preceding the closing date (the “CFC Closing Price”) multiplied by the number of shares of Carolina Financial common stock subject to such stock option. Also, at the effective time of the Merger, each restricted stock grant, restricted stock unit grant or any other award of a share of Carolina Financial common stock subject to vesting, repurchase or other lapse restriction under a Carolina Financial stock plan (other than a stock option) (each, a “Stock Award”) that was outstanding immediately prior to the effective time of the Merger, vested in accordance with the terms of the Carolina Financial stock plan and at the election of the holder (i) converted into the right to receive shares of United common stock based on the 1.13 exchange ratio or (ii) converted into cash in an amount equal to the CFC Closing Price multiplied by the shares of Carolina Financial common stock subject to the Stock Award. Immediately following the Merger, CresCom Bank, a wholly-owned subsidiary of Carolina Financial, merged with and into United Bank, a wholly-owned subsidiary of United (the “Bank Merger”). United Bank survived the Bank Merger and continues to exist as a Virginia banking corporation. CresCom Bank owned and operated Crescent Mortgage Company (“Crescent Mortgage”), which is based in Atlanta, Georgia. As a result of the Bank Merger, Crescent Mortgage Company is now a wholly-owned subsidiary of United Bank. The Merger was accounted for under the acquisition method of accounting. The results of operations of Carolina Financial are included in the consolidated results of operations from the Acquisition Date. The acquisition of Carolina Financial affords United the opportunity to expand its existing footprint in North Carolina and South Carolina. As of the Acquisition Date, Carolina Financial had $5,005,744 in total assets, $3,292,635 in gross loans and $3,873,183 in deposits. Carolina Financial has banking locations in North Carolina and South Carolina. The aggregate purchase price was approximately $817,877, including common stock valued at $815,997, stock options assumed valued at $1,833, and cash paid for fractional shares of $47. The number of shares issued in the transaction was 28,031,501, which were valued based on the closing market price of $29.11 for United’s common shares on May 1, 2020. The preliminary purchase price has been allocated to the identifiable tangible and intangible assets resulting in preliminary additions to goodwill, core deposit intangibles and the Crescent Mortgage trade name intangible of $316,765, $3,037 and $1,370, respectively. The core deposit intangible are expected to be amortized on an acce l erate d b asis Because the consideration paid was greater than the net fair value of the acquired assets and liabilities, the Company recorded goodwill as part of the acquisition. None of the goodwill from the Carolina Financial acquisition is expected to be deductible for tax purposes. United used an independent third party to help determine the fair values of the assets and liabilities acquired from Carolina Financial. As a result of the merger, United recorded preliminary fair value discounts of $51,553 on the loans acquired, $562 non-PCD Portfolio loans acquired from Carolina Financial were recorded at their fair value at the Acquisition Date based on a discounted cash flow methodology. The estimated fair value incorporates adjustments related to expected credit losses, prevailing market interest rates for comparable assets and other market factors such as liquidity from the perspective of a market participant. Also, acquired portfolio loans were evaluated upon acquisition and classified as either PCD, which indicates that the loan has experienced a more-than-insignificant deterioration in credit quality since origination, or non-PCD. non-PCD non-PCD non-PCD The following table provides a reconciliation of the difference between the purchase price and the par value of portfolio loans acquired from Carolina Financial as of the Acquisition Date: Purchase price of PCD loans at acquisition $ 1,053,014 Allowance for credit losses at acquisition 18,635 Non-credit 10,259 Par value (UPB) of acquired PCD loans at acquisition $ 1,081,908 The consideration paid for Carolina Financial’s common equity and the preliminary amounts of acquired identifiable assets and liabilities assumed as of the Carolina Financial Acquisition Date were as follows: Purchase price: Value of common shares issued (28,031,501 shares) $ 815,997 Fair value of stock options assumed 1,833 Cash for fractional shares 47 Total purchase price 817,877 Identifiable assets: Cash and cash equivalents 629,154 Investment securities 580,849 Loans held for sale 65,757 Net l 3,242,812 Premises and equipment 83,859 Operating lease right-of-use 9,861 Crescent Mortgage trade name intangible 1,370 Core deposit intangible 3,037 Mortgage servicing rights 20,123 Other assets 166,175 Total identifiable assets $ 4,802,997 Identifiable liabilities: Deposits $ 3,884,977 Short-term borrowings 332,000 Long-term borrowings 42,738 Operating lease liability 9,861 Other liabilities 32,309 Total identifiable liabilities 4,301,885 Preliminary fair value of net assets acquired including identifiable intangible assets 501,112 Preliminary resulting goodwill $ 316,765 The operating results of United for the six months ended June 30, 2020 include operating results of acquired assets and assumed liabilities subsequent to the Carolina Financial Acquisition Date. The operations of United’s North Carolina and South Carolina geographic area, which includes the acquired operations of Carolina Financial, and Cr escent Mort gage results of operations The following table presents certain unaudited pro forma information for the results of operations for the six months ended June 30, 2020 and 2019, as if the Carolina Financial merger had occurred on January 1, 2020 and 2019, respectively. These results combine the historical results of Carolina Financial into United’s consolidated statement of income and, while certain adjustments were made for the estimated impact of certain fair valuation adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on the indicated date nor are they intended to represent or be indicative of future results of operations. In particular, no

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	3. INVESTMENT SECURITIES Securities Available for Sale Securities held for indefinite periods of time are classified as available for sale and carried at estimated fair value. The amortized cost and estimated fair values of securities available for sale are summarized as follows. June 30, 2020 Amortized Gross Gross Allowance Estimated Value U.S. Treasury securities and obligations of U.S. $ 66,394 $ 912 $ 3 $ 0 $ 67,303 State and political subdivisions 502,293 18,823 236 0 520,880 Residential mortgage-backed securities Agency 819,073 29,209 51 0 848,231 Non-agency 61,954 1,011 0 0 62,965 Commercial mortgage-backed securities Agency 591,303 31,581 99 0 622,785 Asset-backed securities 293,293 0 15,572 0 277,721 Trust preferred collateralized debt obligations 11,895 2,644 1,702 0 12,837 Single issue trust preferred securities 18,211 159 2,179 0 16,191 Other corporate securities 365,934 6,430 1,336 0 371,028 Total $ 2,730,350 $ 90,769 $ 21,178 $ 0 $ 2,799,941 December 31, 2019 Amortized Gross Gross Estimated Value Cumulative (1) U.S. Treasury securities and obligations of U.S. $ 58,127 $ 555 $ 6 $ 58,676 $ 0 State and political subdivisions 272,014 3,644 3,296 272,362 0 Residential mortgage-backed securities Agency 826,857 10,923 1,246 836,534 0 Non-agency 3,429 404 0 3,833 86 Commercial mortgage-backed securities Agency 609,461 8,319 2,807 614,973 0 Asset-backed securities 284,390 0 8,251 276,139 0 Trust preferred collateralized debt obligations 6,045 0 1,342 4,703 842 Single issue trust preferred securities 18,196 170 1,592 16,774 0 Other corporate securities 348,405 4,897 0 353,302 0 Total $ 2,426,924 $ 28,912 $ 18,540 $ 2,437,296 $ 928 (1) Non-credit before-tax. United has made a policy election to exclude accrued interest from the amortized cost basis of available-for-sale Available-for-sale non-accrual non-accrual The following is a summary of securities available for sale which were in an unrealized loss position at June 30, 2020 and December 31, 2019. Less than 12 months 12 months or longer Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses June 30, 2020 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 348 $ 3 $ 0 $ 0 $ 348 $ 3 State and political subdivisions 17,795 235 226 1 18,021 236 Residential mortgage-backed securities Agency 26,496 51 0 0 26,496 51 Non-agency 0 0 0 0 0 0 Commercial mortgage-backed securities Agency 14,025 99 0 0 14,025 99 Asset-backed securities 11,202 675 254,882 14,897 266,084 15,572 Trust preferred collateralized debt obligations 0 0 4,347 1,702 4,347 1,702 Single issue trust preferred securities 0 0 12,984 2,179 12,984 2,179 Other corporate securities 96,038 1,336 0 0 96,038 1,336 Total $ 165,904 $ 2,399 $ 272,439 $ 18,779 $ 438,343 $ 21,178 Less than 12 months 12 months or longer Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses December 31, 2019 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 1,415 $ 6 $ 0 $ 0 $ 1,415 $ 6 State and political subdivisions 144,307 3,291 885 5 145,192 3,296 Residential mortgage-backed securities Agency 108,072 502 71,736 744 179,808 1,246 Non-agency 0 0 0 0 0 0 Commercial mortgage-backed securities Agency 173,039 2,676 45,251 131 218,290 2,807 Asset-backed securities 135,174 3,252 140,965 4,999 276,139 8,251 Trust preferred collateralized debt obligations 2,703 842 2,000 500 4,703 1,342 Single issue trust preferred securities 0 0 13,562 1,592 13,562 1,592 Other corporate securities 0 0 0 0 0 0 Total $ 564,710 $ 10,569 $ 274,399 $ 7,971 $ 839,109 $ 18,540 The following table shows the proceeds from maturities, sales and calls of available for sale securities and the gross realized gains and losses on sales and calls of those securities that have been included in earnings as a result of any sales and calls. Gains or losses on sales and calls of available for sale securities were recognized by the specific identification method. The realized losses relate to sales of securities within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers and its subsidiaries. Three Months Ended June 30 Six Months Ended June 30 2020 2019 2020 2019 Proceeds from sales and calls $ 280,780 $ 188,432 $ 413,706 $ 384,763 Gross realized gains 1,565 739 1,818 754 Gross realized losses 98 608 177 972 At June 30, 2020, gross unrealized losses on available for sale securities were $21,178 on 77 securities of a total portfolio of 982 available for sale securities. Securities with the most significant gross unrealized losses at June 30, 2020 consisted primarily of asset-backed securities and single issue trust preferred securities. The asset-backed securities are backed by Federal Family Education Loan Program (“FFELP”) student loan collateral which includes a minimum of a 97% government repayment guaranty, as well as additional credit support and subordination in excess of the government guaranteed portion. The single issue trust preferred securities relate to securities of financial institutions. In determining whether or not a security is impaired, management considered the severity of the loss in conjunction with United’s positive intent and the more likely than not ability to hold these securities to recovery of their cost basis or maturity. State and political subdivisions United’s state and political subdivisions portfolio relates to securities issued by various municipalities located throughout the United States. The total amortized cost of available for sale state and political subdivision securities was $502,293 at June 30, 2020. As of June 30, 2020, approximately 57% of the portfolio was supported by the general obligation of the issuing municipality, which allows for the securities to be repaid by any means available to the municipality. The majority of the portfolio was rated AA or higher, and less than 0.1% the portfolio were rated below investment grade as of June 30, 2020. In addition to monitoring the credit ratings of these securities, management also evaluates the financial performance of the underlying issuers on an ongoing basis. Based upon management’s analysis and judgment, it was determined that none of the state and political subdivision securities were impaired at June 30, 2020. Agency mortgage-backed securities United’s agency mortgage-backed securities portfolio relates to securities issued by Fannie Mae, Freddie Mac, and Ginnie Mae. The total amortized cost of available for sale agency mortgage-backed securities was $1,410,376 at June 30, 2020. Of the $1,410,376 amount, $591,303 was related to agency commercial mortgage-backed securities and $819,073 was related to agency residential mortgage-backed securities. Each of the agency mortgage-backed securities provides a guarantee of full and timely payments of principal and interest by the issuing agency. Based upon management’s analysis and judgment, it was determined that none of the agency mortgage-backed securities were impaired at June 30, 2020. Non-agency United’s non-agency non-agency non-agency Single issue trust preferred securities The majority of United’s single issue trust preferred portfolio consists of obligations from large cap banks (i.e. banks with market capitalization in excess of $10 billion). All single issue trust preferred securities are currently receiving interest payments. The amortized cost of available for sale single issue trust preferred securities as of June 30, 2020 consisted of $11,492 in investment grade bonds, $978 in split rated bonds, and $5,741 in unrated bonds. Management reviews each issuer’s current and projected earnings trends, asset quality, capitalization levels, and other key factors. Upon completing the review for the second quarter of 2020, it was determined that none of the single issue trust preferred securities were impaired. Trust preferred collateralized debt obligations (Trup Cdos) The total amortized cost balance of United’s Trup Cdo portfolio was $11,895 as of June 30, 2020. For any securities in an unrealized loss position, the Company first assesses its intentions regarding any sale of securities as well as the likelihood that it would be required to sell prior to recovery of the amortized cost. As of June 30, 2020, the Company has determined that it does not intend to sell any Trup Cdo and that it is not more likely than not that the Company will be required to sell such securities before recovery of their amortized cost. To determine a net realizable value and assess whether impairment existed, management performed detailed cash flow analysis to determine whether, in management’s judgment, it was more likely that United would not recover the entire amortized cost basis of the security. Based on this review, management does not believe any individual security with an unrealized loss as of June 30, 2020 is impaired. Corporate securities As of June 30, 2020, United’s Corporate securities portfolio had a total amortized cost balance of $365,934. The majority of the portfolio consisted of debt issuances of corporations representing a variety of industries, including financial institutions. Of the $365,934, 88% was investment grade rated and 12% was unrated. For corporate securities, management has evaluated the near-term prospects of the investment in relation to the severity of any unrealized loss. Based upon management’s analysis and judgment, it was determined that none of the corporate securities were impaired at June 30, 2020. The amortized cost and estimated fair value of securities available for sale at June 30, 2020 and December 31, 2019 by contractual maturity are shown as follows. Expected maturities may differ from contractual maturities because the issuers may have the right to call or prepay obligations without penalties. June 30, 2020 December 31, 2019 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 125,837 $ 127,307 $ 92,422 $ 92,473 Due after one year through five years 497,487 514,819 583,715 592,850 Due after five years through ten years 634,934 658,516 564,922 568,241 Due after ten years 1,472,092 1,499,299 1,185,865 1,183,732 Total $ 2,730,350 $ 2,799,941 $ 2,426,924 $ 2,437,296 Equity securities at fair value Equity securities consist mainly of equity securities of financial institutions and mutual funds within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries. The fair value of United’s equity securities was $9,875 at June 30, 2020 and $8,894 at December 31, 2019. Three Months Ended June 30 Six Months Ended June 30 2020 2019 2020 2019 Net gains recognized during the period $ 43 $ 55 $ 65 $ 244 Net gains recognized during the period on equity securities sold 1 2 7 134 Unrealized gains recognized during the period on equity securities still held at period end 43 64 114 122 Unrealized losses recognized during the period on equity securities still held at period end (1 ) (11 ) (56 ) (12 ) Other investment securities During the second quarter of 2020, United evaluated all of its cost method investments to determine if certain events or changes in circumstances during the second quarter of 2020 had a significant adverse effect on the fair value of any of its cost method securities. United determined that there was no individual security that experienced an adverse event during the second quarter. There were no other events or changes in circumstances during the second quarter which would have an adverse effect on the fair value of its cost method securities. The carrying value of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes as required or permitted by law, approximated $2,150,574 and $1,540,717 at June 30, 2020 and December 31, 2019, respectively.

Loans

Loans	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Loans	4. LOANS Major classes of loans and leases are as follows: June 30, 2020 December 31, Commercial, financial and agricultural: Owner-occupied commercial real estate $ 1,624,760 $ 1,201,652 Nonowner-occupied commercial real estate 5,004,790 3,965,960 Other commercial loans and leases 4,113,505 2,285,037 Total commercial, financial & agricultural 10,743,055 7,452,649 Residential real estate 4,310,156 3,686,401 Construction & land development 1,775,728 1,408,205 Consumer: Bankcard 8,465 10,074 Other consumer 1,195,150 1,156,219 Total gross loans and lease s $ 18,032,554 $ 13,713,548 Included in “Other commercial loans and leases” at June 30, 2020 are leases in the amount of $13,372. These leases, acquired by United in the Carolina Financial merger, are primarily on equipment utilized for business purposes with terms generally ranging from 12 to 60 months and include option to purchase the leased equipment at the end of the lease. The table above does not include loans held for sale of $625,984 and $387,514 at June 30, 2020 and December 31, 2019, respectively. Loans held for sale consist of single-family residential real estate loans originated for sale in the secondary market. United’s subsidiary bank has made loans to the directors and officers of United and its subsidiaries, and to their affiliates. The aggregate dollar amount of these loans was $35,816 and $38,558 at June 30, 2020 and December 31, 2019, respectively.

Credit Quality

Credit Quality	6 Months Ended
	Jun. 30, 2020
Text Block [Abstract]
Credit Quality	5. CREDIT QUALITY Management monitors the credit quality of its loans on an ongoing basis. Measurement of delinquency and past due status are based on the contractual terms of each loan. United considers a loan to be past due when it is 30 days or more past its contractual payment due date. For all loan classes, past due loans are reviewed on a monthly basis to identify loans for nonaccrual status. Generally, when collection in full of the principal and interest is jeopardized, the loan is placed on nonaccrual status. The accrual of interest income on commercial and most consumer loans generally is discontinued when a loan becomes 90 to 120 days past due as to principal or interest. However, regardless of delinquency status, if a loan is fully secured and in the process of collection and resolution of collection is expected in the near term (generally less than 90 days), then the loan will not be placed on nonaccrual status. When interest accruals are discontinued, unpaid interest recognized in income in the current year is reversed, and unpaid interest accrued in prior years is charged to the allowance for credit losses. United’s method of income recognition for loans that are classified as nonaccrual is to recognize interest income on a cash basis or apply the cash receipt to principal when the ultimate collectibility of principal is in doubt. Nonaccrual loans will not normally be returned to accrual status unless all past due principal and interest has been paid and the borrower has evidenced their ability to meet the contractual provisions of the note. A loan is categorized as a troubled debt restructuring (“TDR”) if a concession is granted and there is deterioration in the financial condition of the borrower. TDRs can take the form of a reduction of the stated interest rate, splitting a loan into separate loans with market terms on one loan and concessionary terms on the other loan, receipts of assets from a debtor in partial or full satisfaction of a loan, the extension of the maturity date or dates at a stated interest rate lower than the current market rate for new debt with similar risk, the reduction of the face amount or maturity amount of the debt (“COVID-19”) COVID-19 As of June 30, 2020, United had TDRs of $77,436 as compared to $58,369 as of December 31, 2019. Of the $77,436 aggregate balance of TDRs at June 30, 2020, $59,916 was on nonaccrual and $544 was 30-89 30-89 , respectively, were advanced to this debtor under a loan that had been previously modified. The following tables sets for the balances of TDRs at June 30, 2020 and December 31, 2019 and the reasons for modification: Reason for modification June 30, 2020 December 31, 2019 Interest rate reduction $ 11,662 $ 1,685 Interest rate reduction and change in terms 3,039 1,733 Forgiveness of principal 252 0 Transfer of asset 121 0 Concession of principal and term 24 0 Extended maturity 4,879 0 Change in terms 57,459 54,951 Total $ 77,436 $ 58,369 The following table sets forth United’s troubled debt restructurings that have been restructured during the three months ended June 30, 2020 and 2019, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2020 June 30, 2019 Number Pre- Post- Number Pre- Post- Commercial real estate: Owner-occupied 18 $ 10,628 $ 10,586 1 $ 150 $ 150 Nonowner-occupied 6 2,259 2,248 0 0 0 Other commercial 14 3,169 3,090 1 559 559 Residential real estate 19 3,889 3,872 2 1,845 1,832 Construction & land development 9 2,562 2,557 3 2,242 2,202 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 3 69 36 0 0 0 Total 69 $ 22,576 $ 22,389 7 $ 4,796 $ 4,743 The following table sets forth United’s troubled debt restructurings that have been restructured during the six months ended June 30, 2020 and 2019, segregated by class of loans: Troubled Debt Restructurings For the Six Months Ended June 30, 2020 June 30, 2019 Number Pre- Post- Number Pre-Modification Post- Commercial real estate: Owner-occupied 21 $ 18,579 $ 18,345 1 $ 150 $ 150 Nonowner-occupied 6 2,259 2,248 0 0 0 Other commercial 18 3,667 3,322 2 824 811 Residential real estate 19 3,889 3,872 3 2,258 2,234 Construction & land development 12 4,607 4,570 3 2,242 2,202 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 3 69 36 0 0 0 Total 79 $ 33,070 $ 32,393 9 $ 5,474 $ 5,397 The following table sets forth United’s troubled debt restructurings, based on their post-modification outstanding recorded balance, that have been restructured during the three and six months ended June 30, 2020 and 2019, segregated by the reason for modification: Three Months Ended Six Months Ended Reason for modification June 30, June 30, June 30, June 30, Interest rate reduction $ 2,675 $ 0 $ 10,028 $ 251 Interest rate reduction and change in terms 1,326 0 1,326 0 Forgiveness of principal 252 0 252 0 Transfer of asset 121 0 121 0 Concession of principal and term 24 0 24 0 Extended maturity 4,879 0 4,879 0 Change in terms 13,112 4,743 15,763 5,146 Total $ 22,389 $ 4,743 $ 32,393 $ 5,397 The loans were evaluated individually for allocation within United’s allowance for loan losses. The modifications had an immaterial impact on the financial condition and results of operations for United. The following table presents troubled debt restructurings, by class of loan, that were restructured during the twelve-month period ended June 30, 2020 and had charge-offs during the three and six months ended June 30, 2020. Three Months Ended June 30, 2020 Six Months Ended June 30, 2020 Number of Recorded Number of Recorded Troubled Debt Restructurings Commercial real estate: Owner-occupied 0 $ 0 0 $ 0 Nonowner-occupied 0 0 0 0 Other commercial 0 0 0 0 Residential real estate 0 0 0 0 Construction & land development 1 690 1 690 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total 1 $ 690 1 $ 690 The following table presents troubled debt restructurings, by class of loan, that were restructured during the twelve-month period ended June 30, 2019 and had charge-offs during the six months ended June 30, 2019. Six Months Ended June 30, 2019 Number of Recorded Troubled Debt Restructurings Commercial real estate: Owner-occupied 0 $ 0 Nonowner-occupied 0 0 Other commercial 1 1,321 Residential real estate 0 0 Construction & land development 0 0 Consumer: Bankcard 0 0 Other consumer 0 0 Total 1 $ 1,321 No loans restructured during the twelve-month periods ended June 30, 2019 subsequently defaulted, resulting in a principal charge-off The following table sets forth United’s age analysis of its past due loans, segregated by class of loans: Age Analysis of Past Due Loans As of June 30, 2020 30-89 90 Days or Total Past Current & Total Financing 90 Days Commercial real estate: Owner-occupied $ 4,281 $ 33,199 $ 37,480 $ 1,587,280 $ 1,624,760 $ 1,419 Nonowner-occupied 3,633 23,365 26,998 4,977,792 5,004,790 859 Other commercial 10,781 43,456 54,237 4,059,268 4,113,505 777 Residential real estate 34,510 29,883 64,393 4,245,763 4,310,156 6,234 Construction & land development 5,427 6,888 12,315 1,763,413 1,775,728 84 Consumer: Bankcard 173 160 333 8,132 8,465 160 Other consumer 7,814 2,023 9,837 1,185,313 1,195,150 1,617 Total $ 66,619 $ 138,974 $ 205,593 $ 17,826,961 $ 18,032,554 $ 11,150 Age Analysis of Past Due Loans As of December 31, 2019 30-89 90 Days or Total Past Current & Total Financing 90 Days &Accruing Commercial real estate: Owner-occupied $ 8,878 $ 11,209 $ 20,087 $ 1,181,565 $ 1,201,652 $ 544 Nonowner-occupied 6,318 16,129 22,447 3,943,513 3,965,960 471 Other commercial 5,238 51,541 56,779 2,228,258 2,285,037 668 Residential real estate 31,727 24,343 56,070 3,630,331 3,686,401 6,256 Construction & land development 2,219 16,043 18,262 1,389,943 1,408,205 0 Consumer: Bankcard 445 218 663 9,411 10,074 218 Other consumer 10,991 1,607 12,598 1,143,621 1,156,219 1,337 Total $ 65,816 $ 121,090 $ 186,906 $ 13,526,642 $ 13,713,548 $ 9,494 (1) Other includes loans with a recorded investment of $96,004 acquired and accounted for under ASC Topic 310-30 The following table sets forth United’s nonaccrual loans, segregated by class of loans: At June 30, 2020 At December 31, Interest Income Nonaccruals With No 90 Days Nonaccruals For The For The Commercial Real Estate: Owner-occupied $ 31,780 $ 26,723 $ 1,419 $ 10,665 $ 17 $ 32 Nonowner-occupied 22,506 19,882 859 15,658 1 1 Other Commercial 42,679 18,909 777 50,873 1 1 Residential Real Estate 23,649 22,022 6,234 18,087 3 3 Construction 6,804 6,759 84 16,043 0 0 Consumer: Bankcard 0 0 160 0 0 0 Other consumer 406 406 1,617 270 0 0 Total $ 127,824 $ 94,701 $ 11,150 $ 111,596 $ 22 $ 37 For the adoption of ASU 2016-13, Collateral Dependent Loans At June 30, 2020 Residential Business Land Commercial Other Total Commercial real estate: Owner-occupied $ 2,084 $ 84 $ 0 $ 19,246 $ 28,719 $ 50,133 Nonowner-occupied 12,806 0 2,981 15,550 17,076 48,413 Other commercial 6,037 47,707 0 0 49 53,793 Residential real estate 25,104 229 255 0 0 25,588 Construction & land development 9,939 0 9,869 0 746 20,554 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total $ 55,970 $ 48,020 $ 13,105 $ 34,796 $ 46,590 $ 198,481 United categorizes loans into risk categories based United uses the following definitions for risk ratings: • Pass • Special Mention • Substandard • Doubtful For United’s loans with a corporate credit exposure, United analyzes loans individually to classify the loans as to credit risk. Review and analysis of criticized (special mention-rated loans in the amount of $1,000 or greater) and classified (substandard-rated and worse in the amount of $500 and greater) loans is completed once per quarter. Review of notes with committed exposure of $2,000 or greater is completed at least annually. For loans with a consumer credit exposure, United internally assigns a grade based upon an individual loan’s delinquency status. United reviews and updates, as necessary, these grades on a quarterly basis. Special mention loans, with a corporate credit exposure, have potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loans or in the Company’s credit position at some future date. Borrowers may be experiencing adverse operating trends (declining revenues or margins) or an ill proportioned balance sheet (e.g., increasing inventory without an increase in sales, high leverage, tight liquidity). Adverse economic or market conditions, such as interest rate increases or the entry of a new competitor, may also support a special mention rating. Nonfinancial reasons for rating a credit exposure special mention include management problems, pending litigation, an ineffective loan agreement or other material structural weakness, and any other significant deviation from prudent lending practices. For loans with a consumer credit exposure, loans that are past due 30 89 A substandard loan with a corporate credit exposure is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness, or weaknesses, that jeopardize the liquidation of the debt by the borrower. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. They require more intensive supervision by management. Substandard loans are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity, or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. For some substandard loans, the likelihood of full collection of interest and principal may be in doubt and thus, placed on nonaccrual. For loans with a consumer credit exposure, loans that are 90 days or more past due or that have been placed on nonaccrual are considered substandard. A loan with corporate credit exposure is classified as doubtful if it has all the weaknesses inherent in one classified as substandard with the added characteristic that the weaknesses make collection in full, on the basis of currently existing facts, conditions, and values, highly questionable. A doubtful loan has a high probability of total or substantial loss, but because of specific pending events that may strengthen the loan, its classification as loss is deferred. Doubtful borrowers are usually in default, lack adequate liquidity or capital, and lack the resources necessary to remain an operating entity. Pending events can include mergers, acquisitions, liquidations, capital injections, the perfection of liens on additional collateral, the valuation of collateral, and refinancing. Generally, there are not any loans with a consumer credit exposure that are classified as doubtful. Usually, they are charged-off Based on the most recent analysis performed, the risk category of loans by class of loans is as follows: Commercial Real Estate – Owner-occupied Term Loans Revolving Revolving loans converted Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 107,784 $ 163,097 $ 133,255 $ 244,528 $ 304,759 $ 565,627 $ 23,576 $ 0 $ 1,542,626 Special 0 1,225 6,995 781 2,100 9,634 0 468 21,203 Substandard 1,831 72 0 2,235 4,542 50,394 1,364 149 60,587 Doubtful 0 0 0 0 0 344 0 0 344 Total $ 109,615 $ 164,394 $ 140,250 $ 247,544 $ 311,401 $ 625,999 $ 24,940 $ 617 $ 1,624,760 YTD 0 0 0 0 0 (535 ) 0 0 (535 ) YTD 0 0 0 0 0 310 0 0 310 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (225 ) $ 0 $ 0 $ (225 ) Commercial Real Estate – Nonowner-occupied Term Loans Revolving Revolving converted to term loans Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 297,474 $ 748,897 $ 685,228 $ 620,528 $ 582,809 $ 1,844,405 $ 115,345 $ 2,145 $ 4,896,831 Special Mention 0 347 0 977 10,645 27,024 0 0 38,993 Substandard 73 964 8,618 1,702 13,245 44,364 0 0 68,966 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 297,547 $ 750,208 $ 693,846 $ 623,207 $ 606,699 $ 1,915,793 $ 115,345 $ 2,145 $ 5,004,790 YTD 0 0 0 0 (690 ) (1,247 ) 0 0 (1,937 ) YTD 0 0 0 0 0 722 0 0 722 YTD $ 0 $ 0 $ 0 $ 0 $ (690 ) $ (525 ) $ 0 $ 0 $ (1,215 ) Other commercial Term Loans Revolving Revolving converted to temr loans Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 1,509,244 $ 451,574 $ 212,881 $ 150,587 $ 150,389 $ 311,422 $ 1,213,494 $ 3,071 $ 4,002,662 Special Mention 99 313 430 2,044 202 20,072 4,053 423 27,636 Substandard 0 895 2,635 2,535 11,386 48,486 16,794 404 83,135 Doubtful 0 0 0 0 0 72 0 0 72 Total $ 1,509,343 $ 452,782 $ 215,946 $ 155,166 $ 161,977 $ 380,052 $ 1,234,341 $ 3,898 $ 4,113,505 YTD 0 (11 ) (964 ) (365 ) (6 ) (5,682 ) 0 0 (7,028 ) YTD 0 42 16 3 21 332 32 0 446 YTD $ 0 $ 31 $ (948 ) $ (362 ) $ 15 $ (5,350 ) $ 32 $ 0 $ (6,582 ) Residential Real Estate Revolving Revolving converted to te rm Total Term Loans Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 324,682 $ 750,044 $ 857,069 $ 393,030 $ 347,781 $ 1,111,476 $ 476,577 $ 4,332 $ 4,264,991 Special Mention 0 271 0 226 2,349 7,014 435 0 10,295 Substandard 0 226 459 3,800 5,333 24,252 437 234 34,741 Doubtful 0 0 0 0 0 129 0 0 129 Total $ 324,682 $ 750,541 $ 857,528 $ 397,056 $ 355,463 $ 1,142,871 $ 477,449 $ 4,566 $ 4,310,156 YTD 0 0 0 0 (1 ) (889 ) 0 0 (890 ) YTD 0 0 0 101 0 201 0 0 302 YTD $ 0 $ 0 $ 0 $ 101 $ (1 ) $ (688 ) $ 0 $ 0 $ (588 ) Construction and Land Development Revolving loans converted Term Loans Revolving Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 163,253 $ 706,921 $ 375,025 $ 173,269 $ 133,679 $ 70,466 $ 102,752 $ 143 $ 1,725,510 Special Mention 0 0 1,506 0 561 2,681 995 0 5,743 Substandard 0 156 1,553 25 0 20,443 22,298 0 44,475 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 163,253 $ 707,077 $ 378,084 $ 173,294 $ 134,240 $ 93,590 $ 126,045 $ 143 $ 1,775,728 YTD 0 0 0 0 0 (1,969 ) 0 0 (1,969 ) YTD 0 0 0 0 0 1,361 0 0 1,361 YTD $ 0 $ 0 $ 0 $ 0 $ 0 $ (608 ) $ 0 $ 0 $ (608 ) Bankcard Revolving loans converted Term Loans Revolving Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 8,133 $ 8,133 Special Mention 0 0 0 0 0 0 0 172 172 Substandard 0 0 0 0 0 0 0 160 160 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 8,465 $ 8,465 YTD 0 0 0 0 0 0 0 (128 ) (128 ) YTD 0 0 0 0 0 0 0 12 12 YTD $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (116 ) $ (116 ) Other Consumer Revolving loans converted Term Loans Revolving Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 220,924 $ 494,700 $ 298,460 $ 104,779 $ 54,766 $ 14,247 $ 7,095 $ 0 $ 1,194,971 Special Mention 0 0 11 0 0 152 4 0 167 Substandard 3 0 0 0 0 9 0 0 12 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 220,927 $ 494,700 $ 298,471 $ 104,779 $ 54,766 $ 14,408 $ 7,099 $ 0 $ 1,195,150 YTD (16 ) (589 ) (652 ) (272 ) (152 ) (225 ) (2 ) 0 (1,908 ) YTD 0 24 33 11 18 124 0 0 210 YTD $ (16 ) $ (565 ) $ (619 ) $ (261 ) $ (134 ) $ (101 ) $ (2 ) $ 0 $ (1,698 ) The following tables set forth United’s credit quality indicators information, by class of loans, as of December 31, 2019: Credit Quality Indicators Corporate Credit Exposure As of December 31, 2019 Commercial Real Estate Other Construction & Owner- Nonowner- Grade: Pass $ 1,136,589 $ 3,850,886 $ 2,136,266 $ 1,334,950 Special mention 14,449 44,134 75,511 4,614 Substandard 50,346 70,940 72,451 68,641 Doubtful 268 0 809 0 Total $ 1,201,652 $ 3,965,960 $ 2,285,037 $ 1,408,205 Credit Quality Indicators Consumer Credit Exposure As of December 31, 2019 Residential Bankcard Other Grade: Pass $ 3,645,654 $ 9,411 $ 1,143,608 Special mention 12,038 445 10,993 Substandard 28,572 218 1,618 Doubtful 137 0 0 Total $ 3,686,401 $ 10,074 $ 1,156,219 At June 30, 2020 and December 31, 2019, other real estate owned (“OREO”) included in other assets in the Consolidated Balance Sheets was $29,947 and $15,515, respectively. OREO consists of real estate acquired in foreclosure or other settlement of loans. Such assets are carried at the lower of the investment in the assets or the fair value of the assets less estimated selling costs. Any adjustment to the fair value at the date of transfer is charged against the allowance for loan losses. Any subsequent valuation adjustments as well as any costs relating to operating, holding or disposing of the property are recorded in other expense in the period incurred. At June 30, 2020 and December 31, 2019, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $1,738 and $890, respectively.

Allowance for Credit Losses

Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Allowance for Credit Losses	6. ALLOWANCE FOR CREDIT LOSSES United adopted the CECL methodology for measuring credit losses as of January 1, 2020. All disclosures as of and for the three months and six months ended June 30, 2020 are presented in accordance with ASC 326. The Company did not recast comparative financial periods and has presented those disclosures under previously applicable GAAP. The allowance for loan losses is an estimate of the expected credit losses on financial assets measured at amortized cost to present the net amount expected to be collected as of the balance sheet date. Such allowance is based on the credit losses expected to arise over the life of the asset (contractual term). Assets are charged off when United determines that such financial assets are deemed uncollectible or based on regulatory requirements, whichever is earlier. Charge-offs are recognized as a deduction from the allowance for credit losses. Expected recoveries of amounts previously charged-off, charged-off, United made a policy election to present the accrued interest receivable balance separately in its consolidated balance sheets from the amortized cost of a loan. Accrued interest receivable was $56,124 and $48,130 at June 30, 2020 and December 31, 2019, respectively, related to loans are included separately in “Accrued interest receivable” in the consolidated balance sheets. United also elected not to measure an allowance for loan losses for accrued interest receivables. For all classes of loans receivable, the accrual of interest is discontinued when the contractual payment of principal or interest has become 90 days past due, unless the loan is well secured and in the process of collection. Interest received on nonaccrual loans, generally is either applied against principal or reported as interest income, according to management’s judgment as to the collectability of principal. The following table represents the accrued interest receivable as of June 30, 2020 and the accrued interest receivables written off by reversing interest income as of June 30, 2020: Accrued Interest Accrued Interest Receivables Written Off by At June 30, 2020 For the Three Months Ended June 30, 2020 For the Six Months Commercial Real Estate: Owner-occupied $ 4,910 $ 83 $ 100 Nonowner-occupied 18,107 38 45 Other Commercial 9,350 33 45 Residential Real Estate 14,085 64 134 Construction 6,825 0 0 Consumer: Bankcard 0 0 0 Other consumer 2,847 27 67 Total $ 56,124 $ 245 $ 391 United estimates the allowance balance using relevant available information, from internal and external sources, relating to past events, current conditions and reasonable and supportable forecasts. Historical credit loss experience provides the basis for the estimation of expected credit losses. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level or term as well as for changes in environmental conditions, such as changes in unemployment rates, property values or other relevant factors. A reversion to historical loss data occurs via a straight-line method during the year following the one-year United pools its loans based on similar risk characteristics in estimating expected credit losses. United has identified the following portfolio segments and measures the allowance for credit losses using the following methods: • Method: Probability of Default/Loss Given Default • Commercial Real Estate Owner-Occupied • Commercial Real Estate Nonowner-Occupied • Commercial Other • Method: Cohort • Residential Real Estate • Construction & Land Development • Consumer • Bankcard Risk characteristics of commercial real estate owner-occupied loans and commercial other loans are similar in that they are normally dependent upon the borrower’s internal cash flow from operations to service debt. Commercial real estate nonowner-occupied loans differ in that cash flow to service debt is normally dependent on external income from third parties for use of the real estate such as rents, leases and room rates. Residential real estate loans are dependent upon individual borrowers who are affected by changes in general economic conditions, demand for housing and resulting residential real estate valuation. Construction and land development loans are impacted mainly by demand whether for new residential housing or for retail, industrial, office and other types of commercial construction within a given area. Consumer loan pool risk characteristics are influenced by general, regional and local economic conditions. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. When management determines that foreclosure is probable or when the borrower is experiencing financial difficulty at the reporting date and repayment is expected to be provided substantially through the operation or sale of the collateral, expected credit losses are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate. Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancelable by United. For past loans acquired through the completion of a transfer, including loans acquired in a business combination, that had evidence of deterioration of credit quality since origination (“PCI”) and accounted for under ASC Topic 310, an entity did not have to reassess whether any loans previously accounted for as PCI meet the definition of purchased credit deteriorated (“PCD”) loans upon adoption of ASC Topic 326. Any changes in the allowance for credit losses for these loans were accounted for as an adjustment to the loan’s amortized cost basis and not as a cumulative-effect adjustment to United’s beginning retained earnings. Non-PCI non-PCD For allowance for credit losses under ASC Topic 326 calculation purposes, all acquired loans will be included in their relevant pool and subject to legacy loss rates for that applicable pool unless they meet the criteria for specific review. For loans acquired after the adoption of ASC Topic 326, United will likely take several factors into consideration when determining if loans meet the definition of PCD. ASC Topic 326 lists some, but not all, factors for consideration in the bifurcation of PCD versus non-PCD • Financial assets that are delinquent as of the acquisition date • Financial assets that have been downgraded since origination • Financial assets that have been placed on nonaccrual status • Financial assets for which, after origination, credit spreads have widened beyond the threshold specified in its policy United maintains an allowance for loan losses and a reserve for lending-related commitments such as unfunded loan commitments and letters of credit. United estimates expected credit losses over the contractual period in which United is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by United. The reserve for lending-related commitments on off-balance For the six months ended June 30, 2020 the allowance for credit losses increased significantly from the year ended December 31, 2019 primarily due to the adoption of the current expected credit loss (CECL) model under ASC 326 on January 1, 2020 and the macroeconomic factors surrounding the COVID-19 The first six months of 2020 qualitative adjustments include analyses of the following: • Past events • Current conditions COVID-19 • Reasonable and supportable forecasts portfolio-by-portfolio • Following the historic drop in GDP in the second quarter of 2020, the forecast projects a large increase in GDP in the third quarter of 2020 with growth rates returning to normal levels by mid-2022. • The forecast also projects continued high levels of beyond 2022. • Forecasts account for United’s best estimate of economic impact from government stimulus. • Reversion to historical loss data occurs via a straight-line method during the year following the one-year A progression of the allowance for loan losses, by portfolio segment, for the periods indicated is summarized as follows: Allowance for Loan Losses and Carrying Amount of Loans For the Three Months Ended June 30, 2020 Commercial Real Estate Construction Allowance Owner- Nonowner- Other Residential & Land Bankcard Other Estimated Total Allowance for Loan Losses: Beginning balance $ 19,495 $ 17,569 $ 53,827 $ 30,624 $ 18,792 $ 226 $ 14,390 $ 0 $ 154,923 Initial allowance for PCD loans (acquired during the period) 1,955 6,418 7,032 652 2,570 0 8 0 18,635 Charge-offs (356 ) (1,937 ) (1,340 ) (523 ) (225 ) (82 ) (1,171 ) 0 (5,634 ) Recoveries 244 137 131 160 517 6 95 0 1,290 Provision 1,400 3,590 19,754 7,970 10,649 130 2,414 0 45,907 Ending balance $ 22,738 $ 25,777 $ 79,404 $ 38,883 $ 32,303 $ 280 $ 15,736 $ 0 $ 215,121 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2020 Commercial Real Estate Construction Allowance Owner- Nonowner- Other Residential & Land Bankcard Other Estimated Total Allowance for Loan Losses: Beginning balance $ 5,554 $ 8,524 $ 47,325 $ 8,997 $ 3,353 $ 74 $ 2,933 $ 297 $ 77,057 Impact of the adoption of ASU 2016-13 9,737 9,023 (4,829 ) 13,097 14,817 28 10,745 (297 ) 52,321 Impact of the adoption of ASU 2016-13 1,843 121 938 174 2,045 0 0 0 5,121 Initial allowance for PCD loans (acquired during the period) 1,955 6,418 7,032 652 2,570 0 8 0 18,635 Charge-offs (535 ) (1,937 ) (7,028 ) (890 ) (1,969 ) (128 ) (1,908 ) 0 (14,395 ) Recoveries 310 722 446 302 1,361 12 210 0 3,363 Provision 3,874 2,906 35,520 16,551 10,126 294 3,748 0 73,019 Ending balance $ 22,738 $ 25,777 $ 79,404 $ 38,883 $ 32,303 $ 280 $ 15,736 $ 0 $ 215,121 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2019 Commercial Real Estate Other Residential Construction & Consumer Allowance Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 5,063 $ 6,919 $ 41,341 $ 12,448 $ 7,992 $ 2,695 $ 245 $ 76,703 Charge-offs (7,905 ) (1,093 ) (12,975 ) (2,967 ) (1,303 ) (2,867 ) 0 (29,110 ) Recoveries 3,733 80 2,599 858 175 706 0 8,151 Provision 4,663 2,618 16,360 (1,342 ) (3,511 ) 2,473 52 21,313 Ending balance $ 5,554 $ 8,524 $ 47,325 $ 8,997 $ 3,353 $ 3,007 $ 297 $ 77,057 Ending Balance: individually evaluated for impairment $ 973 $ 2,979 $ 11,931 $ 354 $ 262 $ 0 $ 0 $ 16,499 Ending Balance: collectively evaluated for impairment $ 4,581 $ 5,545 $ 35,394 $ 8,643 $ 3,091 $ 3,007 $ 297 $ 60,558 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 1,201,652 $ 3,965,960 $ 2,285,037 $ 3,686,401 $ 1,408,205 $ 1,166,293 $ 0 $ 13,713,548 Ending Balance: individually evaluated for impairment $ 16,703 $ 27,121 $ 54,108 $ 11,526 $ 14,047 $ 0 $ 0 $ 123,505 Ending Balance: collectively evaluated for impairment $ 1,160,556 $ 3,925,249 $ 2,194,432 $ 3,665,140 $ 1,382,369 $ 1,166,293 $ 0 $ 13,494,039 Ending Balance: loans acquired with deteriorated credit quality $ 24,393 $ 13,590 $ 36,497 $ 9,735 $ 11,789 $ 0 $ 0 $ 96,004

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	7. INTANGIBLE ASSETS The following is a summary of intangible assets subject to amortization and those not subject to amortization: June 30, 2020 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 101,396 $ (72,738 ) $ 0 $ 0 $ 101,396 $ (72,738 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Crescent Mortgage trade name 0 1,370 1,370 Total $ 0 $ 2,450 $ 2,450 Goodwill not subject to amortization $ 1,789,464 $ 5,315 $ 1,794,779 December 31, 2019 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 98,359 $ (69,508 ) $ 0 $ 0 $ 98,359 $ (69,508 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Goodwill not subject to amortization $ 1,472,699 $ 5,315 $ 1,478,014 The following table provides a reconciliation of goodwill: Community Mortgage Total Goodwill at December 31, 2019 $ 1,472,699 $ 5,315 $ 1,478,014 Preliminary addition to goodwill from Carolina Financial acquisition 316,765 0 316,765 Goodwill at June 30, 2020 $ 1,789,464 $ 5,315 $ 1,794,779 United incurred amortization expense of $1,646 and $3,223 for the three and six months ended June 30, 2020 as compared to $1,754 and $3,508 for the three and six months ended June 30, 2019, respectively. The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2019: Year Amount 2020 $ 6,612 2021 5,780 2022 4,939 2023 4,641 2024 and thereafter 9,916

Mortage Servicing Rights

Mortage Servicing Rights	6 Months Ended
	Jun. 30, 2020
Servicing Asset [Abstract]
Mortage Servicing Rights	8. MORTGAGE SERVICING RIGHTS Mortgage loans serviced for others are not included in the accompanying Consolidated Balance Sheets. The value of mortgage servicing rights (“MSRs”) is included on the Company’s Consolidated Balance Sheets. The Company initially measures servicing assets and liabilities retained related to the sale of residential loans held for sale at fair value. For subsequent measurement purposes, the Company measures servicing assets and liabilities based on the lower of cost or market using the amortization method. Mortgage servicing rights are amortized in proportion to, and over the period of, estimated net servicing income. The amortization of the mortgage servicing rights is analyzed periodically and is adjusted to reflect changes in prepayment rates and other estimates. The Company evaluates potential impairment of mortgage servicing rights based on the difference between the carrying amount and current estimated fair value of the servicing rights. The valuation of mortgage servicing rights, and the determination of any potential impairment, is performed by aggregating all servicing rights and stratifying them into tranches based on predominant risk characteristics. Generally, loan servicing becomes more valuable when interest rates rise (as prepayments typically decrease) and less valuable when interest rates decline (as prepayments typically increase). If impairment exists, a valuation allowance is established for any excess of amortized cost over the current estimated fair value by a charge to income. If the Company later determines that all or a portion of the impairment no longer exists for a particular tranche, a reduction of the allowance may be recorded as an increase to income. Service fee income is recorded for fees earned for servicing mortgage loans under servicing agreements with the Federal National Mortgage Association (“FNMA”), the Federal Home Loan Mortgage Corporation (“FHLMC”), Government National Mortgage Association (“GNMA”) and certain private investors. The fees are based on a contractual percentage of the outstanding principal balance of the loans serviced and are recorded in noninterest income. Amortization of mortgage servicing rights and mortgage servicing costs are charged to expense when incurred. The unpaid principal balances of loans serviced for others were approximately $3,552,292 at June 30, 2020. The estimated fair value of the mortgage servicing rights was $20,200 at June 30, 2020. The estimated fair value of servicing rights at June 30, 2020 was determined using a net servicing fee of 0.26%, average discount rates ranging from 10.50% to 12.91% with a weighted average discount rate of 10.63%, average constant prepayment rates (“CPR”) ranging from 7.08% to 15.66% with a weighted average prepayment rate of 14.40%, depending upon the stratification of the specific servicing right, and a delinquency rate of 3.78%. Please refer to Note 14 in these Notes to Consolidated Financial Statements for additional information concerning the fair value of MSRs. As disclosed in Note 2 of these Notes to Consolidated Financial Statements , the Company acquired approximately $20,123 of mortgage servicing rights from its acquisition of Carolina Financial Corporation on May 1, 2020. The following presents the activity in mortgage servicing rights, including their valuation allowance for the three and six months ended June 30, 2020: Three Months Six Months MSRs beginning balance $ 0 $ 0 Addition from acquisition of subsidiary 20,123 20,123 Amount capitalized 1,891 1,891 Purchased servicing 0 0 Amount amortized (1,104 ) (1,104 ) MSRs ending balance $ 20,910 $ 20,910 MSRs valuation allowance beginning balance $ 0 $ 0 MSRs impairment (710 ) (710 ) MSRs valuation allowance ending balance $ (710 ) $ (710 ) MSRs, net of valuation allowance $ 20,200 $ 20,200 The Company recorded a $710 temporary impairment of mortgage servicing rights from the date of acquisition to June 30, 2020. The Company does not hedge the mortgage servicing rights positions and the impact of falling long-term interest rates increased prepayment speed assumptions reducing the value of the MSR asset. The estimated amortization expense is based on current information regarding future loan payments and prepayments. Amortization expense could change in future periods based on changes in the volume of prepayments and economic factors.

Leases

Leases	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Leases	9. LEASES United determines if an arrangement is a lease at inception. United and certain subsidiaries have entered into various noncancelable-operating leases for branch and loan production offices as well as operating facilities. Operating leases are included in operating lease right-of-use United’s operating leases are subject to renewal options under various terms. United’s operating leases have remaining terms of 1 to 13 years, some of which include options to extend leases generally for periods of 5 years. United rents or subleases certain real estate to third parties. Our sublease portfolio consists of operating leases to other organizations for former branch offices. ROU assets represent United’s right to use an underlying asset for the lease term and lease liabilities represent United’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities The components of lease expense were as follows: Three Months Ended Three Months Ended Classification June 30, 2020 June 30, 2019 Operating lease cost Net occupancy expense $ 5,895 $ 4,886 Sublease income Net occupancy expense (189 ) (197 ) Net lease cost $ 5,706 $ 4,689 Six Months Ended Six Months Ended Classification June 30, 2020 June 30, 2019 Operating lease cost Net occupancy expense $ 10,961 $ 9,707 Sublease income Net occupancy expense (394 ) (473 ) Net lease cost $ 10,567 $ 9,234 Supplemental balance sheet information related to leases was as follows: Classification June 30, 2020 December 31, 2019 Operating lease right-of-use Operating lease right-of-use assets $ 70,655 $ 57,783 Operating lease liabilities Operating lease liabilities $ 74,435 $ 61,342 Other information related to leases was as follows: June 30, 2020 Weighted-average remaining lease term: Operating leases 5.5 years Weighted-average discount rate: Operating leases 2.68 % Supplemental cash flow information related to leases was as follows: Three Months Ended June 30, 2020 June 30, 2019 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 5,722 $ 4,931 ROU assets obtained in the exchange for lease liabilities 8,549 4,214 Six Months Ended June 30, 2020 June 30, 2019 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 10,739 $ 9,649 ROU assets obtained in the exchange for lease liabilities 12,332 4,416 Maturities of lease liabilities by year and in the aggregate, under operating leases with initial or remaining terms of one year or more, for years subsequent to December 31, 2019, consists of the following as of June 30, 2020 and December 31, 2019: Amount Year As of June 30, 2020 As of December 31, 2019 2020 $ 10,670 17,725 2021 18,884 15,180 2022 14,782 11,522 2023 11,412 8,751 2024 7,264 5,127 Thereafter 16,909 8,190 Total lease payments 79,921 66,495 Less: imputed interest (5,486 ) (5,153 ) Total $ 74,435 $ 61,342

Short-Term Borrowings

Short-Term Borrowings	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Short-Term Borrowings	10. SHORT-TERM BORROWINGS Federal funds purchased and securities sold under agreements to repurchase are a significant source of funds for the Company. United has various unused lines of credit available from certain of its correspondent banks in the aggregate amount of $230,000. These lines of credit, which bear interest at prevailing market rates, permit United to borrow funds in the overnight market, and are renewable annually subject to certain conditions. At June 30, 2020, United did not have any federal funds purchased while total securities sold under agreements to repurchase (“REPOs”) were $176,168. The securities sold under agreements to repurchase were accounted for as collateralized financial transactions. They were recorded at the amounts at which the securities were acquired or sold plus accrued interest. United has a $20,000 line of credit with an unrelated financial institution to provide for general liquidity needs. The line is an unsecured, revolving line of credit. The line will be renewable on a 360-day basis and will carry an indexed, floating-rate of interest. The line requires compliance with various financial and nonfinancial covenants. At June 30, 2020, United had no outstanding balance under this line of credit.

Long-Term Borrowings

Long-Term Borrowings	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Long-Term Borrowings	11. LONG-TERM BORROWINGS United’s subsidiary bank is a member of the Federal Home Loan Bank (“FHLB”). Membership in the FHLB makes available short-term and long-term borrowings from collateralized advances. All FHLB borrowings are collateralized by a mix of single-family residential mortgage loans, commercial loans and investment securities. At June 30, 2020, United had an unused borrowing amount of approximately $4,278,441 available subject to delivery of collateral after certain trigger points. Advances may be called by the FHLB or redeemed by United based on predefined factors and penalties. At June 30, 2020, $1,354,879 of FHLB advances with a weighted-average interest rate of 1.59% are scheduled to mature within the next five years. The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2020 $ 495,170 2021 827,724 2022 20,989 2023 0 2024 and thereafter 10,996 Total $ 1,354,879 At June 30, 2020, United had a total of nineteen statutory business trusts that were formed for the purpose of issuing or participating in pools of trust preferred capital securities (“Capital Securities”) with the proceeds invested in junior subordinated debt securities (“Debentures”) of United. The Debentures, which are subordinate and junior in right of payment to all present and future senior indebtedness and certain other financial obligations of United, are the sole assets of the trusts and United’s payment under the Debentures is the sole source of revenue for the trusts. United also assumed $10,000 in aggregate principal amount of fixed-to-floating Under the provisions of the junior subordinated debt, United has the right to defer payment of interest on the junior subordinated debt at any time, or from time to time, for periods not exceeding five years. If interest payments on the junior subordinated debt are deferred, the dividends on the Capital Securities are also deferred. Interest on the junior subordinated debt is cumulative. In accordance with the fully-phased in “Basel III Capital Rules” as published by United’s primary federal regulator, the Federal Reserve, United is unable to consider the Capital Securities as Tier 1 capital, but rather the Capital Securities are included as a component of United’s Tier 2 capital. United can include the Capital Securities in its Tier 2 capital on a permanent basis.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	6 Months Ended
	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	12. COMMITMENTS AND CONTINGENT LIABILITIES Lending-related Commitments United is a party to financial instruments with off-balance-sheet United’s maximum exposure to credit loss in the event of nonperformance by the counterparty to the financial instrument for the loan commitments and standby letters of credit is the contractual or notional amount of those instruments. United uses the same policies in making commitments and conditional obligations as it does for on-balance Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the commitment contract. Commitments generally have fixed expiration dates or other termination clauses and may require the payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily, and historically do not, represent future cash requirements. The amount of collateral obtained, if deemed necessary upon the extension of credit, is based on management’s credit evaluation of the counterparty. United had approximately $5,302,560 and $3,610,777 of loan commitments outstanding as of June 30, 2020 and December 31, 2019, respectively, approximately half of which contractually expire within one year. Included in the June 30, 2020 amount are commitments to extend credit of $498,512 related to mortgage loan funding commitments of United’s mortgage banking segment and are of a short-term nature. Commercial and standby letters of credit are agreements used by United’s customers as a means of improving their credit standing in their dealings with others. Under these agreements, United guarantees certain financial commitments of its customers. A commercial letter of credit is issued specifically to facilitate trade or commerce. Typically, under the terms of a commercial letter of credit, a commitment is drawn upon when the underlying transaction is consummated as intended between the customer and a third party. As of June 30, 2020 and December 31, 2019, United had $5,092 of commercial letters of credit outstanding. A standby letter of credit is generally contingent upon the failure of a customer to perform according to the terms of an underlying contract with a third party. United has issued standby letters of credit of $147,940 and $145,105 as of June 30, 2020 and December 31, 2019, respectively. In accordance with the Contingencies Topic of the FASB Accounting Standards Codification, United has determined that substantially all of its letters of credit are renewed on an annual basis and the fees associated with these letters of credit are immaterial. Mortgage Repurchase Reserve United’s mortgage banking segment provides for its estimated exposure to repurchase loans previously sold to investors for which borrowers failed to provide full and accurate information on their loan application or for which appraisals have not been acceptable or where the loan was not underwritten in accordance with the loan program specified by the loan investor, and for other exposure to its investors related to loan sales activities. United evaluates the merits of each claim and estimates its reserve based on actual and expected claims received and considers the historical amounts paid to settle such claims. United’s mortgage banking segment has a reserve of $1,330 as of June 30, 2020. United has derivative counter-party risk that may arise from the possible inability of United’s mortgage banking segment’s third party investors to meet the terms of their forward sales contracts. United’s mortgage banking segment works with third-party investors that are generally well-capitalized, are investment grade and exhibit strong financial performance to mitigate this risk. United does not expect any third-party investor to fail to meet its obligation. Legal Proceedings United and its subsidiaries are currently involved in various legal proceedings in the normal course of business. Management is vigorously pursuing all its legal and factual defenses and, after consultation with legal counsel, believes that all such litigation will be resolved with no material effect on United’s financial position. Regulatory Matters A variety of consumer products, including mortgage and deposit products, and certain fees and charges related to such products, have come under increased regulatory scrutiny. It is possible that regulatory authorities could bring enforcement actions, including civil money penalties, or take other actions against United in regard to these consumer products. United could also determine of its own accord, or be required by regulators, to refund or otherwise make remediation payments to customers in connection with these products. It is not possible at this time for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss related to such matters.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	13. DERIVATIVE FINANCIAL INSTRUMENTS United uses derivative instruments to help aid against adverse price changes or interest rate movements on the value of certain assets or liabilities and on future cash flows. These derivatives may consist of interest rate swaps, caps, floors, collars, futures, forward contracts, written and purchased options. United also executes derivative instruments with its commercial banking customers to facilitate its risk management strategies. United accounts for its derivative financial instruments in accordance with ASC Topic 815 which requires all derivative instruments to be carried at fair value on the balance sheet. United has designated certain derivative instruments used to manage interest rate risk as hedge relationships with certain assets, liabilities or cash flows being hedged. Certain derivatives used for interest rate risk management are not designated in a hedge relationship. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. For a fair value hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to the hedged financial instrument. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a fair value hedge are offset in current period earnings. For a cash flow hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to other comprehensive income within shareholders’ equity, net of tax. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a cash flow hedge are offset to other comprehensive income, net of tax. The portion of a hedge that is ineffective is recognized immediately in earnings. During the three months ended June 30, 2020, United entered into a new interest rate swap derivative designated as a cash flow hedge. The notional amount of the cash flow hedge derivative totaled $250,000. The derivative is intended to hedge the changes in cash flows associated with floating rate FHLB borrowings. United is required to pay-fixed 1-month 10-years the classified from AOCI as an increase to interest expense over the next 12-months following June 30, 2020 related to the cash flow hedge. As of June 30 , 2020, the maximum length of time over which forecasted transactions are hedged is ten years. At inception of a hedge relationship, United formally documents the hedged item, the particular risk management objective, the nature of the risk being hedged, the derivative being used, how effectiveness of the hedge will be assessed and how the ineffectiveness of the hedge will be measured. United also assesses hedge effectiveness at inception and on an ongoing basis using regression analysis. Hedge ineffectiveness is measured by using the change in fair value method. The change in fair value method compares the change in the fair value of the hedging derivative to the change in the fair value of the hedged exposure, attributable to changes in the benchmark rate. The portion of a hedge that is ineffective is recognized immediately in earnings. United is subject to the Dodd-Frank Act clearing requirement for eligible derivatives. United has executed and cleared eligible derivatives through the London Clearing House (“LCH”). Variation margin at the LCH is distinguished as settled-to-market collateralized-to-market. United through its mortgage banking subsidiaries enters into interest rate lock commitments to finance residential mortgage loans with its customers. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by United. Interest rate risk arises on these commitments and subsequently closed loans if interest rates change between the time of the interest rate lock and the delivery of the loan to the investor. Market risk on interest rate lock commitments and mortgage loans held for sale is managed using corresponding forward mortgage loan sales contracts. United is a party to these forward mortgage loan sales contracts to sell loans servicing released and short sales of mortgage-backed securities. When the interest rate is locked with the borrower, the rate lock commitment, forward sale agreement, and mortgage-backed security position are undesignated derivatives and marked to fair value through earnings. The fair value of the rate lock derivative includes the servicing premium and the interest spread for the difference between retail and wholesale mortgage rates. Income from mortgage banking activities includes the gain recognized for the period presented and associated elements of fair value. United sells mortgage loans on either a best efforts or mandatory delivery basis. For loans sold on a mandatory delivery basis, United enters into forward mortgage-backed securities (the “residual hedge”) to mitigate the effect of interest rate risk. Both the rate lock commitment under mandatory delivery and the residual hedge are recorded at fair value through earnings and are not designated as accounting hedges. At the closing of the loan, the loan commitment derivative expires and United records a loan held for sale at fair value and continues to mark these assets to market under the election of fair value option. United closes out of the trading mortgage-backed securities assigned within the residual hedge and replaces the securities with a forward sales contract once a price has been accepted by an investor and recorded at fair value. For those loans selected to be sold under best efforts delivery, at the closing of the loan, the rate lock commitment derivative expires and the Company records a loan held for sale at fair value under the election of fair value option and continues to be obligated under the same forward loan sales contract entered into at inception of the rate lock commitment. The following tables disclose the derivative instruments’ location on the Company’s Consolidated Balance Sheets and the notional amount and fair value of those instruments at June 30, 2020 and December 31, 2019. Asset Derivatives June 30, 2020 December 31, 2019 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives not designated as hedging instruments Forward loan sales commitments Other $ 73,432 $ 1,745 Other $ 27,260 $ 9 Interest rate lock commitments Other assets 878,925 27,833 Other assets 117,252 4,518 Total derivatives not designated as hedging instruments $ 952,357 $ 29,578 $ 144,512 $ 4,527 Total asset derivatives $ 952,357 $ 29,578 $ 144,512 $ 4,527 Liability Derivatives June 30, 2020 December 31, 2019 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives designated as hedging instruments Fair Value Hedges: Interest rate swap contracts (hedging commercial loans) Other liabilities $ 79,225 $ 8,424 Other liabilities $ 82,243 $ 2,394 Total Fair Value Hedges $ 79,225 $ 8,424 $ 82,243 $ 2,394 Cash Flow Hedge: Interest rate swap contract (hedging FHLB borrowing) Other liabilities $ 250,000 $ 1,659 Other liabilities $ 0 $ 0 Total Cash Flow Hedge $ 250,000 $ 1,659 $ 0 $ 0 Total derivatives designated as hedging instruments $ 329,225 $ 10,083 $ 82,243 $ 2,394 Liability Derivatives June 30, 2020 December 31, 2019 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives not designated as hedging instruments TBA mortgage-backed securities Other $ 186,500 $ 4,224 Other $ 274,000 $ 671 Total derivatives not designated as hedging instruments $ 186,500 $ 4,224 $ 274,000 $ 671 Total liability derivatives $ 515,725 $ 14,307 $ 356,243 $ 3,065 The following table represents the carrying amount of the hedged assets/(liabilities) and the cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) that are designated as a fair value accounting relationship as of June 30, 2020 and December 31, 2019. Derivatives in Fair Value Hedging Relationships Location in the Statement June 30, 2020 Carrying Amount Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 80,048 $ (8,424 ) $ 0 Derivatives in Fair Value Hedging Relationships Location in the Statement December 31, 2019 Carrying Amount Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 81,397 $ (2,394 ) $ 0 Derivative contracts involve the risk of dealing with both bank customers and institutional derivative counterparties and their ability to meet contractual terms. Credit risk arises from the possible inability of counterparties to meet the terms of their contracts. United’s exposure is limited to the replacement value of the contracts rather than the notional amount of the contract. The Company’s agreements generally contain provisions that limit the unsecured exposure up to an agreed upon threshold. Additionally, the Company attempts to minimize credit risk through certain approval processes established by management. The effect of United’s derivative financial instruments on its unaudited Consolidated Statements of Income for the three and six months ended June 30, 2020 and 2019 are presented as follows: Three Months Ended Income Statement Location June 30, June 30, Derivatives in hedging relationships Fair Value Hedges: Interest rate swap contracts Interest and fees on loans $ (277 ) $ (68 ) Total derivatives in hedging relationships $ (277 ) $ (68 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities (553 ) 492 TBA mortgage-backed securities Income from Mortgage Banking Activities 17,204 (962 ) Interest rate lock commitments Income from Mortgage Banking Activities (1,527 ) 3,833 Total derivatives not designated as hedging instruments $ 15,124 $ 3,363 Total derivatives $ 14,847 $ 3,295 Six Months Ended Income Statement Location June 30, June 30, Derivatives in fair value hedging relationships Fair Value Hedges: Interest rate swap contracts Interest and fees on loans $ (720 ) $ (98 ) Total derivatives in hedging relationships $ (720 ) $ (98 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities 207 872 TBA mortgage-backed securities Income from Mortgage Banking Activities (1,771 ) (474 ) Interest rate lock commitments Income from Mortgage Banking Activities 12,169 5,870 Total derivatives not designated as hedging instruments $ 10,605 $ 6,268 Total derivatives $ 9,885 $ 6,170

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	14. FAIR VALUE MEASUREMENTS United determines the fair values of its financial instruments based on the fair value hierarchy established by ASC Topic 820, which also clarifies that fair value of certain assets and liabilities is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The Fair Value Measurements and Disclosures Topic specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect United’s market assumptions. The three levels of the fair value hierarchy, based on these two types of inputs, are as follows Level 1 - Valuation is based on quoted prices in active markets for identical assets and liabilities. Level 2 - Valuation is based on observable inputs including quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets and liabilities in less active markets, and model-based valuation techniques for which significant assumptions can be derived primarily from or corroborated by observable data in the market. Level 3 - Valuation is based on prices, inputs and model-based techniques that use one or more significant inputs or assumptions that are unobservable in the market. When determining the fair value measurements for assets and liabilities, United looks to active and observable markets to price identical assets or liabilities whenever possible and classifies such items in Level 1. When identical assets and liabilities are not traded in active markets, United looks to market observable data for similar assets and liabilities and classifies such items as Level 2. Nevertheless, certain assets and liabilities are not actively traded in observable markets and United must use alternative valuation techniques using unobservable inputs to determine a fair value and classifies such items as Level 3. For assets and liabilities that are not actively traded, the fair value measurement is based primarily upon estimates that require significant judgment. Therefore, the results may not be realized in an actual sale or immediate settlement of the asset or liability. Additionally, there are inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results of current or future values. The level within the fair value hierarchy is based on the lowest level of input that is significant in the fair value measurement. In accordance with ASC Topic 820, the following describes the valuation techniques used by United to measure certain financial assets and liabilities recorded at fair value on a recurring basis in the financial statements. Securities available for sale and equity securities factors to determine if a market is inactive, all of which may require a significant level of judgment. Factors that management considers include: a significant widening of the bid-ask spread, a considerable decline in the volume and level of trading activity in the instrument, a significant variance in prices among market participants, and a significant reduction in the level of observable inputs. Any securities available for sale not valued based upon quoted market prices or third party pricing models that consider observable market data are considered Level 3. Currently, United considers its valuation of available-for-sale as Level 3. Based upon management’s review of the market conditions for , it was determined that an income approach valuation technique (present value technique) that maximizes the use of relevant observable inputs and minimizes the use of unobservable inputs is the most representative measurement technique for these securities. The present value technique discounts Loans held for sale Derivatives For a fair value hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to the hedged financial instrument. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a fair value hedge are offset in current period earnings either in interest income or interest expense depending on the nature of the hedged financial instrument. For a cash flow hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to other comprehensive income within shareholders’ equity, net of tax. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a cash flow hedge are offset to other comprehensive income, net of tax. The portion of a hedge that is ineffective is recognized immediately in earnings. The Company records its interest rate lock commitments and forward loan sales commitments at fair value determined as the amount that would be required to settle each of these derivative financial instruments at the balance sheet date. In the normal course of business, United’s mortgage banking subsidiaries enter into contractual interest rate lock commitments to extend credit to borrowers with fixed expiration dates. The commitments become effective when the borrowers “lock-in” through to the date the loan closes are undesignated derivatives and accordingly, are marked to fair value through earnings. These valuations fall into a Level 2 category. For residential mortgage loans sold in the mortgage banking segment, the interest rate lock commitments are recorded at fair value which is measured using valuations from investors for loans with similar characteristics (Level 2) with some adjusted for the Company’s actual sales experience versus the investor’s indicated pricing (Level 3). The unobservable input for Level 3 valuations is the Company’s historical sales prices. For June 30, 2020, the range of historical sales prices increased the investor’s indicated pricing by a range of 0.12% to 0.52% with a weighted average increase of 0.29%. For interest rate swap derivatives that are not designated in a hedge relationship, changes in the fair value of the derivatives are recognized in earnings in the same period as the change in the fair value. Unrealized gains and losses due to changes in the fair value of other derivative financial instruments not in hedge relationship are included in noninterest income and noninterest expense, respectively. The following tables present the balances of financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2020 and December 31, 2019, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2020 Using Description Balance as of June 30, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale debt securities: U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 67,303 $ 0 $ 67,303 $ 0 State and political subdivisions 520,880 0 520,880 0 Residential mortgage-backed securities Agency 848,231 0 848,231 0 Non-agency 62,965 0 62,965 0 Commercial mortgage-backed securities Agency 622,785 0 622,785 0 Asset-backed securities 277,721 0 277,721 0 Trust preferred collateralized debt obligations 12,837 0 0 12,837 Single issue trust preferred securities 16,191 0 16,191 0 Other corporate securities 371,028 6,432 364,596 0 Total available for sale securities 2,799,941 6,432 2,780,672 12,837 Equity securities: Financial services industry 103 103 0 0 Equity mutual funds (1) 3,783 3,783 0 0 Other equity securities 5,989 5,989 0 0 Total equity securities 9,875 9,875 0 0 Loans held for sale 611,277 0 45,480 565,797 Derivative financial assets: Forward sales commitments 1,745 0 1,745 0 Interest rate lock commitments 27,833 0 7,413 20,420 Total derivative financial assets 29,578 0 9,158 20,420 Liabilities Derivative financial liabilities: Interest rate swap contracts 10,083 0 10,083 0 TBA mortgage-backed securities 4,224 0 4,224 0 Total derivative financial liabilities 14,307 0 14,307 0 (1) The equity mutual funds are within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries. Fair Value at December 31, 2019 Using Description Balance as of December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale debt securities: U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 58,676 $ 0 $ 58,676 $ 0 State and political subdivisions 272,362 0 272,362 0 Residential mortgage-backed securities Agency 836,534 0 836,534 0 Non-agency 3,833 0 3,833 0 Commercial mortgage-backed securities Agency 614,973 0 614,973 0 Asset-backed securities 276,139 0 276,139 0 Trust preferred collateralized debt obligations 4,703 0 0 4,703 Single issue trust preferred securities 16,774 0 16,774 0 Other corporate securities 353,302 6,586 346,716 0 Total available for sale securities 2,437,296 6,586 2,426,007 4,703 Equity securities: Financial services industry 154 154 0 0 Equity mutual funds (1) 3,971 3,971 0 0 Other equity securities 4,769 4,769 0 0 Total equity securities 8,894 8,894 0 0 Loans held for sale 384,375 0 0 384,375 Derivative financial assets: Interest rate swap contracts 9 0 9 0 Forward sales commitments 4,518 0 0 4,518 Total derivative financial assets 4,527 0 9 4,518 Liabilities Derivative financial liabilities: 2,394 0 2,394 0 TBA mortgage-backed securities 671 0 671 0 Total derivative financial liabilities 3,065 0 3,065 0 (1) The equity mutual funds are within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries. There were no transfers between Level 1 and Level 2 for financial assets and liabilities measured at fair value on a recurring basis during the six months ended June 30, 2020 and the year ended December 31, 2019. The following table presents additional information about financial assets and liabilities measured Available for sale Securities Trust preferred collateralized debt obligations June 30, 2020 December 31, Balance, beginning of period $ 4,703 $ 5,917 Total gains or losses (realized/unrealized): Included in earnings (or changes in net assets) 0 (155 ) Included in other comprehensive income 2,318 (1,059 ) Acquired in Carolina Financial merger 5,816 0 Balance, end of period $ 12,837 $ 4,703 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ 0 $ 0 Loans held for sale June 30, 2020 December 31, Balance, beginning of period $ 384,375 $ 247,104 Originations 2,363,759 2,941,722 Sales (2,261,049 ) (2,888,257 ) Total gains or losses during the period recognized in earnings 78,712 83,806 Balance, end of period $ 565,797 $ 384,375 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ 0 $ 0 Derivative Financial Assets Interest Rate Lock June 30, 2020 December 31, Balance, beginning of period $ 4,518 $ 4,103 Transfers other 15,902 415 Balance, end of period $ 20,420 $ 4,518 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ 0 $ 0 Certain financial assets are measured at fair value on a nonrecurring basis in accordance with GAAP. Adjustments to the fair value of these assets usually result from the application of lower-of-cost-or-market Fair Value Option United elected the fair value option for the loans held for sale in its mortgage banking segment to mitigate a divergence between accounting losses and economic exposure. The following table reflects the change in fair value included in earnings of financial instruments for which the fair value option has been elected: Description Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 Assets Loans held for sale Income from mortgage banking activities $ 8,846 $ 4,578 Description Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Assets Loans held for sale Income from mortgage banking activities $ 10,471 $ 6,542 The following table reflects the difference between the aggregate fair value and the remaining contractual principal outstanding for financial instruments for which the fair value option has been elected: June 30, 2020 December 31, 2019 Description Unpaid Fair Value Fair Value r / Unpaid Fair Value Fair Value Assets Loans held for sale $ 591,397 $ 611,277 $ 19,880 $ 375,274 $ 384,375 $ 9,101 Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis The following describes the valuation techniques used by United to measure certain financial assets recorded at fair value on a nonrecurring basis in the financial statements. Loans held for sale Individually assessed loans construction business equipment is based upon an outside appraisal if deemed significant, or the net book value on the applicable business’ financial statements if not considered significant using observable market data. Likewise, values for inventory and accounts receivables collateral are based on financial statement balances or aging reports (Level 3). For individually assessed loans, a specific reserve is established through the allowance for loan losses, if necessary, by estimating the fair value of the underlying collateral on a nonrecurring basis. Any fair value adjustments are recorded in the period incurred as provision for credit losses expense on the Consolidated Statements of Income. OREO bi-annual Intangible Assets annually more-likely-than-not COVID-19 more-likely-than-not COVID-19 Mortgage Servicing Rights ( “ MSRs ” ): ayment speeds, projected d e , including loans on forbearance was 3.78%. The Company recorded a $710 temporary impairment of mortgage servicing rights in the quarter ended June 30, 2020. The Company does not hedge the mortgage servicing rights positions and the impact of falling long-term interest rates increased prepayment speed assumptions reducing the value of MSRs asset. The following table summarizes United’s financial assets that were measured at fair value on a nonrecurring basis during the period: Carrying value at June 30, 2020 Description Balance as of June 30, Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD (Losses) Assets Loans held for sale $ 14,707 $ 0 $ 14,707 $ 0 $ (2 ) Individually assessed loans 59,488 0 49,732 9,756 568 OREO 29,947 0 29,898 49 (440 ) Mortgage servicing rights 20,200 0 0 20,200 (710 ) Carrying value at December 31, 2019 Description Balance as of December 31, Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD (Losses) Assets Loans held for sale $ 3,139 $ 0 $ 3,139 $ 0 $ (4 ) Impaired Loans 68,213 0 55,792 12,421 1,831 OREO 15,515 0 15,495 20 (785 ) Fair Value of Other Financial Instruments The following methods and assumptions were used by United in estimating its fair value disclosures for other financial instruments: Cash and Cash Equivalents: Securities held to maturity and other securities Loans one-to-four Deposits Short-term Borrowings: Long-term Borrowings: Summary of Fair Values for All Financial Instruments The estimated fair values of United’s financial instruments are summarized below: Fair Value Measurements Carrying Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) June 30, 2020 Cash and cash equivalents $ 2,062,813 $ 2,062,813 $ 0 $ 2,062,813 $ 0 Securities available for sale 2,799,941 2,799,941 6,432 2,780,672 12,837 Securities held to maturity 1,221 1,220 0 200 1,020 Equity securities 9,875 9,875 9,875 0 0 Other securities 251,161 238,603 0 0 238,603 Loans held for sale 625,984 625,984 0 60,187 565,797 Net loans 17,777,281 17,191,993 0 0 17,191,993 Derivative financial assets 29,578 29,578 0 9,158 20,420 Mortgage servicing rights 20,200 20,200 0 0 20,200 Deposits 19,893,843 19,902,498 0 19,902,498 0 Short-term borrowings 176,168 176,168 0 176,168 0 Long-term borrowings 1,633,891 1,597,685 0 1,597,685 0 Derivative financial liabilities 14,307 14,307 0 14,307 0 December 31, 2019 Cash and cash equivalents $ 837,493 $ 837,493 $ 0 $ 837,493 $ 0 Securities available for sale 2,437,296 2,437,296 6,586 2,426,007 4,703 Securities held to maturity 1,446 1,447 0 427 1,020 Equity securities 8,894 8,894 8,894 0 0 Other securities 222,161 211,053 0 0 211,053 Loans held for sale 387,514 387,514 0 3,139 384,375 Net loans 13,635,072 13,185,955 0 0 13,185,955 Derivative financial assets 4,527 4,527 0 9 4,518 Deposits 13,852,421 13,843,077 0 13,843,077 0 Short-term borrowings 374,654 374,654 0 374,654 0 Long-term borrowings 1,838,029 1,820,297 0 1,820,297 0 Derivative financial liabilities 3,065 3,065 0 3,065 0

Stock Based Compensation

Stock Based Compensation	6 Months Ended
	Jun. 30, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	15. STOCK BASED COMPENSATION On May 12, 2020, United’s shareholders approved the 2020 Long-Term Incentive Plan (“2020 LTI Plan”). The 2020 LTI Plan became effective May 1 3 non-qualified 2020 LTI Plan. The maximum number of options and stock appreciation rights, in the aggregate, which may be awarded to any individual key employee during any calendar year is 100,000. The maximum number of options and stock appreciation rights, in the aggregate, which may be awarded to any non-employee non-employee all awards will vest as the Committee determines in the award agreement, provided that no awards will vest sooner than 1/3 per year over the first three anniversaries of the award. United adopted a clawback policy that applies to named executive officers and other executive officers and permits the Committee to cancel certain awards to recoup gains realized from previous awards should United be required to prepare an accounting restatement due to materially inaccurate performance metrics. A For S-8 Compensation expense of $1,369 and $2,622 related to the nonvested awards under United’s Long-Term Incentive Plans was incurred for the second quarter and first six months of 2020, respectively, as compared to the compensation expense of $1,198 and $2,311 related to the nonvested awards under United’s Long-Term Incentive Plans incurred for the second quarter and first six months of 2019, respectively. Compensation expense was included in employee compensation in the unaudited Consolidated Statements of Income. Stock Options United currently has options outstanding from various option plans other than the 2020 LTI Plan (the “Prior Plans”); however, no common shares of United stock are available for grants under the Prior Plans as these plans have expired. Awards outstanding under the Prior Plans will remain in effect in accordance with their respective terms. The maximum term for options granted under the plans is ten (10) years. A summary of activity under United’s stock option plans as of June 30, 2020, and the changes during the first six months of 2020 are presented below: Six Months Ended June 30, 2020 Weighted Average Aggregate Remaining Intrinsic Contractual Exercise Shares Value Term (Yrs.) Price Outstanding at January 1, 2020 1,715,316 $ 34.49 Assumed in Carolina Financial merger 117,116 12.14 Granted 183,551 32.51 Exercised (14,994 ) 20.48 Forfeited or expired (8,915 ) 28.47 Outstanding at June 30, 2020 1,992,074 $ 2,513 5.5 $ 33.13 Exercisable at June 30, 2020 1,446,719 $ 2,513 4.4 $ 31.67 The following table summarizes the status of United’s nonvested stock option awards during the first six months of 2020: Shares Weighted-Average Nonvested at January 1, 2020 589,737 $ 7.62 Granted 183,551 5.65 Vested (225,582 ) 7.68 Forfeited or expired (2,351 ) 7.32 Nonvested at June 30, 2020 545,355 $ 6.93 During the six months ended June 30, 2020 and 2019, 14,994 and 47,960 shares, respectively, were issued in connection with stock option exercises. All shares issued in connection with stock option exercises for the six months ended June 30, 2020 and 2019 were issued from authorized and unissued stock. The total intrinsic value of options exercised under the Plans during the six months ended June 30, 2020 and 2019 was $249 and $713 respectively. Restricted Stock Under the 2020 LTI Plan, United may award restricted common shares to key employees and non-employee will vest no sooner than 1/3 per year over the first three anniversaries of the award. Unless determined by the Committee or the Board and provided in the award agreement, recipients The following summarizes the changes to United’s restricted common shares for the period ended June 30, 2020: Number of Weighted-Average Outstanding at January 1, 2020 247,896 $ 39.20 Granted 175,495 32.51 Vested (88,671 ) 39.32 Forfeited (946 ) 36.58 Outstanding at June 30, 2020 333,774 $ 35.66

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2020
Retirement Benefits [Abstract]
Employee Benefit Plans	16. EMPLOYEE BENEFIT PLANS United has a defined benefit retirement plan covering qualified employees. Pension benefits are based on years of service and the average of the employee’s highest five consecutive plan years of basic compensation paid during the ten plan years preceding the date of determination. Contributions are intended to provide not only for benefits attributed to service to date, but also for those expected to be earned in the future. No discretionary contributions were made during the first six months of 2020 and 2019. In September of 2007, after a recommendation by United’s Pension Committee and approval by United’s Board of Directors, the United Bankshares, Inc. Pension Plan (the “Plan”) was amended to change the participation rules. The decision to change the participation rules for the Plan followed current industry trends, as many large and medium size companies had taken similar steps. The amendment provides that employees hired on or after October 1, 2007, will not be eligible to participate in the Plan. However, new employees will be eligible to participate in United’s Savings and Stock Investment 401(k) plan. This change had no impact on current employees hired prior to October 1, 2007 as they will continue to participate in the Plan, with no change in benefit provisions, and will continue to be eligible to participate in United’s Savings and Stock Investment 401(k) plan. Included in accumulated other comprehensive income at December 31, 2019 are unrecognized actuarial losses of $60,894 ($46,706 net of tax) that have not yet been recognized in net periodic pension cost. The amortization of this item expected to be recognized in net periodic pension cost during the fiscal year ended December 31, 2020 is $5,802 ($4,450 net of tax). Net periodic pension cost for the three and six months ended June 30, 2020 and 2019 included the following components : Three Months Ended June 30 Six Months Ended June 30 2020 2019 2020 2019 Service cost $ 715 $ 561 $ 1,430 $ 1,116 Interest cost 1,286 1,459 2,573 2,901 Expected return on plan assets (2,630 ) (2,356 ) (5,259 ) (4,686 ) Recognized net actuarial loss 1,442 1,184 2,884 2,355 Net periodic pension cost $ 813 $ 848 $ 1,628 $ 1,686 Weighted-Average Assumptions: Discount rate 3.42 % 4.52 % 3.42 % 4.52 % Expected return on assets 6.75 % 7.00 % 6.75 % 7.00 % Rate of c i 5.00 % n/a 5.00 % n/a Rate of c i 40-54) 4.00 % n/a 4.00 % n/a Rate of compensation increase (prior to age 45) n/a 3.50 % n/a 3.50 % Rate of compensation increase (otherwise) 3.50 % 3.00 % 3.50 % 3.00 %

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	17. INCOME TAXES United records a liability for uncertain income tax positions based on a recognition threshold of more-likely-than-not, As of June 30, 2020 and 2019, the total amount of accrued interest related to uncertain tax positions was $718 and $726, respectively. United accounts for interest and penalties related to uncertain tax positions as part of its provision for federal and state income taxes. United is currently open to audit under the statute of limitations by the Internal Revenue Service for the years ended December 31, 2016, 2017 and 2018 and certain State Taxing authorities for the years ended December 31, 2016 through 2018. United’s effective tax rate was 17.30% and 18.38% for the second quarter and first six months of 2020 and 20.69% and 21.04% for the second quarter and first six months of 2019.

Comprehensive Income

Comprehensive Income	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Comprehensive Income	18. COMPREHENSIVE INCOME The components of total comprehensive income for the three and six months ended June 30, 2020 and 2019 are as follows: Three Months Ended Six Months Ended June 30 June 30 2020 2019 2020 2019 Net Income $ 52,686 $ 67,207 $ 92,869 $ 130,849 Available for sale (“AFS”) securities: AFS securities with OTTI charges during the period 0 (75 ) 0 (75 ) Related income tax effect 0 17 0 17 Less: OTTI charges recognized in net income 0 75 0 75 Related income tax benefit 0 (17 ) 0 (17 ) Reclassification of previous noncredit OTTI to credit OTTI 0 2,188 0 2,188 Related income tax benefit 0 (510 ) 0 (510 ) Net unrealized (losses) gains on AFS securities with OTTI 0 1,678 0 1,678 AFS securities – all other: Change in net unrealized gain on AFS securities arising during the period 37,756 21,141 60,859 43,379 Related income tax effect (8,797 ) (4,925 ) (14,180 ) (10,107 ) Net reclassification adjustment for (gains) losses included in net income (1,466 ) 130 (1,641 ) (218 ) Related income tax expense (benefit) 341 (30 ) 382 51 27,834 16,316 45,420 33,105 Net effect of AFS securities on other comprehensive income 27,834 17,994 45,420 34,783 Cash flow hedge derivatives: Unrealized loss (1,659 ) 0 (1,659 ) 0 Related income tax effect 387 0 387 0 Net effect of cash flow hedge derivatives on other comprehensive income (1,272 ) 0 (1,272 ) 0 Pension plan: Recognized net actuarial loss 1,442 1,184 2,884 2,355 Related income tax benefit (329 ) (275 ) (659 ) (536 ) Net effect of change in pension plan asset on other comprehensive income 1,113 909 2,225 1,819 Total change in other comprehensive income 27,675 18,903 46,373 36,602 Total Comprehensive Income $ 80,361 $ 86,110 $ 139,242 $ 167,451 The components of accumulated other comprehensive income for the six months ended June 30, 2020 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2020 Unrealized Unrealized Defined Benefit Items Total Balance at January 1, 2020 $ 7,956 $ 0 $ (42,825 ) $ (34,869 ) Other comprehensive income before reclassification 46,679 (1,272 ) 0 45,407 Amounts reclassified from accumulated other comprehensive income (1,259 ) 0 2,225 966 Net current-period other comprehensive income, net of tax 45,420 (1,272 ) 2,225 46,373 Balance at June 30, 2020 $ 53,376 $ (1,272 ) $ (40,600 ) $ 11,504 Reclassifications out of Accumulated Other Comprehensive Income (AOCI) For the Six Months Ended June 30, 2020 Details about AOCI Components Amount Affected Line Item in the Statement Where Net Income is Presented Available for sale (“AFS”) securities: Net reclassification adjustment for losses (gains) included in net income $ (1,641 ) Net investment securities (losses) gains (1,641 ) Total before tax Related income tax effect 382 Tax expense (1,259 ) Net of tax Cash flow hedge: Net reclassification adjustment for losses (gains) included in net income $ 0 Other income (expense) 0 Total before tax Related income tax effect 0 Tax expense Pension plan: Recognized net actuarial loss 2,884 (a ) 2,884 Total before tax Related income tax effect (659) Tax expense 2,225 Total rec lassifications for the period $ 966 (a)

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Earnings Per Share	19. EARNINGS PER SHARE The reconciliation of the numerator and denominator of basic earnings per share with that of diluted earnings per share is presented as follows: Three Months Ended Six Months Ended June 30 June 30 2020 2019 2020 2019 Distributed earnings allocated to common stock $ 45,298 $ 34,604 $ 80,785 $ 69,276 Undistributed earnings allocated to common stock 7,262 32,446 11,840 61,276 Net earnings allocated to common shareholders $ 52,560 $ 67,050 $ 92,625 $ 130,552 Average common shares outstanding 119,823,652 101,773,643 110,559,363 101,833,880 Equivalents from stock options 64,171 274,202 65,613 265,929 Average diluted shares outstanding 119,887,823 102,047,845 110,624,976 102,099,809 Earnings per basic common share $ 0.44 $ 0.66 $ 0.84 $ 1.28 Earnings per diluted common share $ 0.44 $ 0.66 $ 0.84 $ 1.28

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	20. VARIABLE INTEREST ENTITIES Variable interest entities (“VIEs”) are entities that either have a total equity investment that is insufficient to permit the entity to finance its activities without additional subordinated financial support or whose equity investors lack the characteristics of a controlling financial interest (i.e., ability to make significant decisions, through voting rights, right to receive the expected residual returns of the entity, and obligation to absorb the expected losses of the entity). VIEs can be structured as corporations, trusts, partnerships, or other legal entities. United’s business practices include relationships with certain VIEs. For United, the business purpose of these relationships primarily consists of funding activities in the form of issuing trust preferred securities. United currently sponsors nineteen statutory business trusts that were created for the purpose of raising funds that originally qualified for Tier I regulatory capital. As previously discussed, these trusts now are considered Tier II regulatory capital. These trusts, of which several were acquired through bank acquisitions, issued or participated in pools of trust preferred capital securities to third-party investors with the proceeds invested in junior subordinated debt securities of United. The Company, through a small capital contribution, owns 100% of the voting equity shares of each trust. The assets, liabilities, operations, and cash flows of each trust are solely related to the issuance, administration, and repayment of the preferred equity securities held by third-party investors. United fully and unconditionally guarantees the obligations of each trust and is obligated to redeem the junior subordinated debentures upon maturity. United does not consolidate these trusts as it is not the primary beneficiary of these entities because United’s wholly owned and indirect wholly owned statutory trust subsidiaries do not have a controlling financial interest in the VIEs. A controlling financial interest is present when an enterprise has both the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The enterprise with a controlling financial interest, known as the primary beneficiary, consolidates the VIE. Information related to United’s statutory trusts is presented in the table below: Description Issuance Date Amount of Stated Interest Rate Maturity Date United Statutory Trust III December 17, 2003 $ 20,000 3-month December 17, 2033 United Statutory Trust IV December 19, 2003 $ 25,000 3-month January 23, 2034 United Statutory Trust V July 12, 2007 $ 50,000 3-month October 1, 2037 United Statutory Trust VI September 20, 2007 $ 30,000 3-month December 15, 2037 Premier Statutory Trust II September 25, 2003 $ 6,000 3-month October 8, 2033 Premier Statutory Trust III May 16, 2005 $ 8,000 3-month June 15, 2035 Premier Statutory Trust IV June 20, 2006 $ 14,000 3-month September 23, 2036 Premier Statutory Trust V December 14, 2006 $ 10,000 3-month March 1, 2037 Centra Statutory Trust I September 20, 2004 $ 10,000 3-month September 20, 2034 Centra Statutory Trust II June 15, 2006 $ 10,000 3-month July 7, 2036 Virginia Commerce Trust II December 19, 2002 $ 15,000 6-month December 19, 2032 Virginia Commerce Trust III December 20, 2005 $ 25,000 3-month February 23, 2036 Cardinal Statutory Trust I July 27, 2004 $ 20,000 3-month September 15, 2034 UFBC Capital Trust I December 30, 2004 $ 5,000 3-month March 15, 2035 Carolina Financial Capital Trust I December 19, 2002 $ 5,000 Prime + 0.50% December 31, 2032 Carolina Financial Capital Trust II November 5, 2003 $ 10,000 3-month January 7, 2034 Greer Capital Trust I October 12, 2004 $ 6,000 3-month October 18, 2034 Greer Capital Trust II December 28, 2006 $ 5,000 3-month January 30, 2037 First South Preferred Trust I September 26, 2003 $ 10,000 3-month September 30, 2033 United, through its banking subsidiary, also makes limited partner equity investments in various low income housing and community development partnerships sponsored by independent third-parties. United invests in these partnerships to either realize tax credits on its consolidated federal income tax return or for purposes of earning a return on its investment. These partnerships are considered VIEs as the limited partners lack a controlling financial interest in the entities through their inability to make decisions that have a significant effect on the operations and success of the partnerships. United’s limited partner interests in these entities is immaterial, however; these partnerships are not consolidated as United is not deemed to be the primary beneficiary. The following table summarizes quantitative information about United’s significant involvement in unconsolidated VIEs: As of June 30, 2020 As of December 31, 2019 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 295,263 $ 284,657 $ 10,606 $ 257,941 $ 248,680 $ 9,261 (1)   Represents investment in VIEs.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Segment Information	21. SEGMENT INFORMATION United operates in two business segments: community banking and mortgage banking. Through its community banking segment, United offers a full range of products and services through various delivery channels. In particular, the community banking segment includes both commercial and consumer lending and provides customers with such products as commercial loans, real estate loans, business financing and consumer loans. In addition, this segment provides customers with several choices of deposit products including demand deposit accounts, savings accounts and certificates of deposit as well as investment and financial advisory services to businesses and individuals, including financial planning, retirement/estate planning, and investment management. The mortgage banking segment engages primarily in the origination and acquisition of residential mortgages for sale into the secondary market though United’s mortgage banking subsidiaries, George Mason and Crescent Mortgage. Crescent Mortgage may retain servicing rights on their mortgage loans sold. At certain times, Crescent may purchase rights to service loans from third parties. These rights are known as mortgage servicing rights provide the owner with the contractual right to receive a stream of cash flows in exchange for performing specified mortgage servicing functions. The community banking segment provides the mortgage banking segment (George Mason and Crescent Mortgage) with short-term funds to originate mortgage loans through a warehouse line of credit and charges the mortgage banking segment interest based on the 30-day The Company does not have any operating segments other than those reported. The “Other” category consists of financial information not directly attributable to a specific segment, including interest income from investments and net securities gains or losses of parent companies and their non-banking non-segment Information about the reportable segments and reconciliation of this information to the consolidated financial statements at and for the three and six months ended June 30, 2020 and 2019 is as follows: At and For the Three Months Ended June 30, 2020 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 167,703 $ 2,246 $ (2,556 ) $ 3,209 $ 170,602 Provision for loans losses 45,911 0 0 0 45,911 Other income 20,301 71,013 47 (2,971 ) 88,390 Other expense 106,477 35,261 7,398 238 149,374 Income taxes 5,841 6,946 (1,766 ) 0 11,021 Net income (loss) $ 29,775 $ 31,052 $ (8,141 ) $ 0 $ 52,686 Total assets (liabilities) $ 25,924,599 $ 730,637 $ 25,678 $ (445,941 ) $ 26,234,973 Average assets (liabilities) 24,198,414 660,483 16,574 (472,871 ) 24,402,600 At and For the Three Months Ended June 30, 2019 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 152,517 $ 111 $ (3,209 ) $ 1,134 $ 150,553 Provision for loans losses 5,417 0 0 0 5,417 Other income 18,398 23,501 53 (2,157 ) 39,795 Other expense 82,304 18,771 143 (1,023 ) 100,195 Income taxes 17,207 1,004 (682 ) 0 17,529 Net income (loss) $ 65,987 $ 3,837 $ (2,617 ) $ 0 $ 67,207 Total assets (liabilities) $ 19,735,901 $ 442,188 $ 16,729 $ (312,279 ) $ 19,882,539 Average assets (liabilities) 19,447,629 326,525 5,387 (263,687 ) 19,515,854 At and For the Six Months Ended June 30, 2020 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 308,123 $ 3,195 $ (5,245 ) $ 6,047 $ 312,120 Provision for loans losses 73,030 0 0 0 73,030 Other income 39,868 92,203 56 (6,931 ) 125,196 Other expense 186,941 56,018 8,432 (884 ) 250,507 Income taxes 16,191 7,219 (2,500 ) 0 20,910 Net income (loss) $ 71,829 $ 32,161 $ (11,121 ) $ 0 $ 92,869 Total assets (liabilities) $ 25,924,599 $ 730,637 $ 25,678 $ (445,941 ) $ 26,234,973 Average assets (liabilities) 21,825,005 513,431 21,756 (374,811 ) 21,985,381 At and For the Six Months Ended June 30, 2019 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 298,407 $ 166 $ (6,532 ) $ 2,680 $ 294,721 Provision for loans losses 10,413 0 0 0 10,413 Other income 36,050 39,607 255 (4,894 ) 71,018 Other expense 158,298 33,613 (77 ) (2,214 ) 189,620 Income taxes 34,873 1,286 (1,302 ) 0 34,857 Net income (loss) $ 130,873 $ 4,874 $ (4,898 ) $ 0 $ 130,849 Total assets (liabilities) $ 19,735,901 $ 442,188 $ 16,729 $ (312,279 ) $ 19,882,539 Average assets (liabilities) 19,324,956 296,008 1,824 (239,281 ) 19,383,507

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated interim financial statements of United Bankshares, Inc. and Subsidiaries (“United” or “the Company”) have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States (GAAP) and with the instructions for Form 10-Q S-X. six-month 10-K, The accompanying consolidated interim financial statements include the accounts of United and its wholly owned subsidiaries. United operates in two business segments: community banking and mortgage banking. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements. Information is presented in these notes to the unaudited consolidated interim financial statements with dollars expressed in thousands, except per share or unless otherwise noted.
Recent Accounting Pronouncements	New Accounting Standards In March 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2020-04, No. 2020-04 No. 2020-04 In February 2020, FASB issued ASU No. 2020-03, No. 2020-03 No. 2020-03 did In January 2020, the FASB issued ASU No. 2020-01, between Topic 321, Topic 323, and Topic 815. The new guidance addresses accounting for the transition into and out of the equity method and measuring certain purchased options and forward contracts to acquire investments. ASU No. 2020-01 No. 2020-01 In November 2019, the FASB issued ASU No. 2019-08, No. 2019-08 No. 2019-08 In April 2019, the FASB issued ASU No. 2019-04 No. 2019-04 In August 2018, the FASB issued ASU No. 2018-14 715-20): No. 2018-14 No. 2018-14 In August 2018, the FASB issued ASU No. 2018-13 No. 2018-13 No. 2018-13 In August 2017, the FASB issued ASU No. 2017-12, classification. ASU No. 2017-12 one-time In January 2017, the FASB issued ASU No. 2017-04, 2017-04 2017-04 2017-04 In June 2016, the FASB issued ASU No. 2016-13, No. 2016-13 No. 2016-13 No. 2016-13 phase-in (COVID-19) No. 2016-13 No. 2016-13 In February 2016, the FASB issued ASU No. 2016-02, No. 2016-02 No. 2016-02 right-of-use No. 2018-11 non-lease non-lease No. 2018-10 2018-10 the standard using the modified retrospective transition method on January 1, 2019. The Company evaluated and elected the package of practical expedients, which allows for existing leases to be accounted for consistent with current guidance, with the exception of the balance sheet recognition for lessees. The Company has also elected the practical expedient on not separating lease and nonlease components and instead treating them as a single lease component. Adoption of the standard resulted in the recognition of additional net lease assets and lease liabilities of $67,040 and $70,692, respectively, as of January 1, 2019. Of the difference between these two amounts, $1,049 was recorded as an adjustment to retained earnings.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2020
Business Combinations [Abstract]
Summary of Reconciliation of Difference Between Purchase Price and Par Value of Purchase Credit Loans Acquired	The following table provides a reconciliation of the difference between the purchase price and the par value of portfolio loans acquired from Carolina Financial as of the Acquisition Date: Purchase price of PCD loans at acquisition $ 1,053,014 Allowance for credit losses at acquisition 18,635 Non-credit 10,259 Par value (UPB) of acquired PCD loans at acquisition $ 1,081,908
Summary of Business Acquisitions, by Acquisition	The consideration paid for Carolina Financial’s common equity and the preliminary amounts of acquired identifiable assets and liabilities assumed as of the Carolina Financial Acquisition Date were as follows: Purchase price: Value of common shares issued (28,031,501 shares) $ 815,997 Fair value of stock options assumed 1,833 Cash for fractional shares 47 Total purchase price 817,877 Identifiable assets: Cash and cash equivalents 629,154 Investment securities 580,849 Loans held for sale 65,757 Net l 3,242,812 Premises and equipment 83,859 Operating lease right-of-use 9,861 Crescent Mortgage trade name intangible 1,370 Core deposit intangible 3,037 Mortgage servicing rights 20,123 Other assets 166,175 Total identifiable assets $ 4,802,997 Identifiable liabilities: Deposits $ 3,884,977 Short-term borrowings 332,000 Long-term borrowings 42,738 Operating lease liability 9,861 Other liabilities 32,309 Total identifiable liabilities 4,301,885 Preliminary fair value of net assets acquired including identifiable intangible assets 501,112 Preliminary resulting goodwill $ 316,765
Summary of Business Acquisition, Pro Forma Information	Proforma Six Months Ended June 30 2020 2019 Total Revenues (1) $ 485,327 $ 461,393 Net Income 71,420 165,930 (1) Represents net interest income plus other income

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2020
Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities	Securities held for indefinite periods of time are classified as available for sale and carried at estimated fair value. The amortized cost and estimated fair values of securities available for sale are summarized as follows. June 30, 2020 Amortized Gross Gross Allowance Estimated Value U.S. Treasury securities and obligations of U.S. $ 66,394 $ 912 $ 3 $ 0 $ 67,303 State and political subdivisions 502,293 18,823 236 0 520,880 Residential mortgage-backed securities Agency 819,073 29,209 51 0 848,231 Non-agency 61,954 1,011 0 0 62,965 Commercial mortgage-backed securities Agency 591,303 31,581 99 0 622,785 Asset-backed securities 293,293 0 15,572 0 277,721 Trust preferred collateralized debt obligations 11,895 2,644 1,702 0 12,837 Single issue trust preferred securities 18,211 159 2,179 0 16,191 Other corporate securities 365,934 6,430 1,336 0 371,028 Total $ 2,730,350 $ 90,769 $ 21,178 $ 0 $ 2,799,941 December 31, 2019 Amortized Gross Gross Estimated Value Cumulative (1) U.S. Treasury securities and obligations of U.S. $ 58,127 $ 555 $ 6 $ 58,676 $ 0 State and political subdivisions 272,014 3,644 3,296 272,362 0 Residential mortgage-backed securities Agency 826,857 10,923 1,246 836,534 0 Non-agency 3,429 404 0 3,833 86 Commercial mortgage-backed securities Agency 609,461 8,319 2,807 614,973 0 Asset-backed securities 284,390 0 8,251 276,139 0 Trust preferred collateralized debt obligations 6,045 0 1,342 4,703 842 Single issue trust preferred securities 18,196 170 1,592 16,774 0 Other corporate securities 348,405 4,897 0 353,302 0 Total $ 2,426,924 $ 28,912 $ 18,540 $ 2,437,296 $ 928 (1) Non-credit before-tax.
Summary of Securities Available for Sale in an Unrealized Loss Position	The following is a summary of securities available for sale which were in an unrealized loss position at June 30, 2020 and December 31, 2019. Less than 12 months 12 months or longer Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses June 30, 2020 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 348 $ 3 $ 0 $ 0 $ 348 $ 3 State and political subdivisions 17,795 235 226 1 18,021 236 Residential mortgage-backed securities Agency 26,496 51 0 0 26,496 51 Non-agency 0 0 0 0 0 0 Commercial mortgage-backed securities Agency 14,025 99 0 0 14,025 99 Asset-backed securities 11,202 675 254,882 14,897 266,084 15,572 Trust preferred collateralized debt obligations 0 0 4,347 1,702 4,347 1,702 Single issue trust preferred securities 0 0 12,984 2,179 12,984 2,179 Other corporate securities 96,038 1,336 0 0 96,038 1,336 Total $ 165,904 $ 2,399 $ 272,439 $ 18,779 $ 438,343 $ 21,178 Less than 12 months 12 months or longer Total Fair Unrealized Fair Unrealized Fair Unrealized Value Losses Value Losses Value Losses December 31, 2019 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 1,415 $ 6 $ 0 $ 0 $ 1,415 $ 6 State and political subdivisions 144,307 3,291 885 5 145,192 3,296 Residential mortgage-backed securities Agency 108,072 502 71,736 744 179,808 1,246 Non-agency 0 0 0 0 0 0 Commercial mortgage-backed securities Agency 173,039 2,676 45,251 131 218,290 2,807 Asset-backed securities 135,174 3,252 140,965 4,999 276,139 8,251 Trust preferred collateralized debt obligations 2,703 842 2,000 500 4,703 1,342 Single issue trust preferred securities 0 0 13,562 1,592 13,562 1,592 Other corporate securities 0 0 0 0 0 0 Total $ 564,710 $ 10,569 $ 274,399 $ 7,971 $ 839,109 $ 18,540
Summary of Gains or Losses on Proceeds from Maturities, Sales and Calls of Available for Sale Securities by Specific Identification Method	The realized losses relate to sales of securities within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers and its subsidiaries Three Months Ended June 30 Six Months Ended June 30 2020 2019 2020 2019 Proceeds from sales and calls $ 280,780 $ 188,432 $ 413,706 $ 384,763 Gross realized gains 1,565 739 1,818 754 Gross realized losses 98 608 177 972
Summary of Equity Securities	The fair value of United’s equity securities was $9,875 at June 30, 2020 and $8,894 at December 31, 2019. Three Months Ended June 30 Six Months Ended June 30 2020 2019 2020 2019 Net gains recognized during the period $ 43 $ 55 $ 65 $ 244 Net gains recognized during the period on equity securities sold 1 2 7 134 Unrealized gains recognized during the period on equity securities still held at period end 43 64 114 122 Unrealized losses recognized during the period on equity securities still held at period end (1 ) (11 ) (56 ) (12 )
Available-for-sale Securities [Member]
Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value	Expected maturities may differ from contractual maturities because the issuers may have the right to call or prepay obligations without penalties. June 30, 2020 December 31, 2019 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 125,837 $ 127,307 $ 92,422 $ 92,473 Due after one year through five years 497,487 514,819 583,715 592,850 Due after five years through ten years 634,934 658,516 564,922 568,241 Due after ten years 1,472,092 1,499,299 1,185,865 1,183,732 Total $ 2,730,350 $ 2,799,941 $ 2,426,924 $ 2,437,296

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Major Classes of Loans And Leases	Major classes of loans and leases are as follows: June 30, 2020 December 31, Commercial, financial and agricultural: Owner-occupied commercial real estate $ 1,624,760 $ 1,201,652 Nonowner-occupied commercial real estate 5,004,790 3,965,960 Other commercial loans and leases 4,113,505 2,285,037 Total commercial, financial & agricultural 10,743,055 7,452,649 Residential real estate 4,310,156 3,686,401 Construction & land development 1,775,728 1,408,205 Consumer: Bankcard 8,465 10,074 Other consumer 1,195,150 1,156,219 Total gross loans and lease s $ 18,032,554 $ 13,713,548

Credit Quality (Tables)

Credit Quality (Tables)	6 Months Ended
	Jun. 30, 2020
Text Block [Abstract]
Schedule of Troubled Debt Restructurings, Segregated by Class of Loans	The following table sets forth United’s troubled debt restructurings that have been restructured during the three months ended June 30, 2020 and 2019, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2020 June 30, 2019 Number Pre- Post- Number Pre- Post- Commercial real estate: Owner-occupied 18 $ 10,628 $ 10,586 1 $ 150 $ 150 Nonowner-occupied 6 2,259 2,248 0 0 0 Other commercial 14 3,169 3,090 1 559 559 Residential real estate 19 3,889 3,872 2 1,845 1,832 Construction & land development 9 2,562 2,557 3 2,242 2,202 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 3 69 36 0 0 0 Total 69 $ 22,576 $ 22,389 7 $ 4,796 $ 4,743 The following table sets forth United’s troubled debt restructurings that have been restructured during the six months ended June 30, 2020 and 2019, segregated by class of loans: Troubled Debt Restructurings For the Six Months Ended June 30, 2020 June 30, 2019 Number Pre- Post- Number Pre-Modification Post- Commercial real estate: Owner-occupied 21 $ 18,579 $ 18,345 1 $ 150 $ 150 Nonowner-occupied 6 2,259 2,248 0 0 0 Other commercial 18 3,667 3,322 2 824 811 Residential real estate 19 3,889 3,872 3 2,258 2,234 Construction & land development 12 4,607 4,570 3 2,242 2,202 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 3 69 36 0 0 0 Total 79 $ 33,070 $ 32,393 9 $ 5,474 $ 5,397
Schedule of Charged-off Troubled Debt Restructurings on Financing Receivables	The following table presents troubled debt restructurings, by class of loan, that were restructured during the twelve-month period ended June 30, 2020 and had charge-offs during the three and six months ended June 30, 2020. Three Months Ended June 30, 2020 Six Months Ended June 30, 2020 Number of Recorded Number of Recorded Troubled Debt Restructurings Commercial real estate: Owner-occupied 0 $ 0 0 $ 0 Nonowner-occupied 0 0 0 0 Other commercial 0 0 0 0 Residential real estate 0 0 0 0 Construction & land development 1 690 1 690 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total 1 $ 690 1 $ 690 The following table presents troubled debt restructurings, by class of loan, that were restructured during the twelve-month period ended June 30, 2019 and had charge-offs during the six months ended June 30, 2019. Six Months Ended June 30, 2019 Number of Recorded Troubled Debt Restructurings Commercial real estate: Owner-occupied 0 $ 0 Nonowner-occupied 0 0 Other commercial 1 1,321 Residential real estate 0 0 Construction & land development 0 0 Consumer: Bankcard 0 0 Other consumer 0 0 Total 1 $ 1,321
Schedule of Age Analysis of Past Due Loans, Segregated by Class of Loans	The following table sets forth United’s age analysis of its past due loans, segregated by class of loans: Age Analysis of Past Due Loans As of June 30, 2020 30-89 90 Days or Total Past Current & Total Financing 90 Days Commercial real estate: Owner-occupied $ 4,281 $ 33,199 $ 37,480 $ 1,587,280 $ 1,624,760 $ 1,419 Nonowner-occupied 3,633 23,365 26,998 4,977,792 5,004,790 859 Other commercial 10,781 43,456 54,237 4,059,268 4,113,505 777 Residential real estate 34,510 29,883 64,393 4,245,763 4,310,156 6,234 Construction & land development 5,427 6,888 12,315 1,763,413 1,775,728 84 Consumer: Bankcard 173 160 333 8,132 8,465 160 Other consumer 7,814 2,023 9,837 1,185,313 1,195,150 1,617 Total $ 66,619 $ 138,974 $ 205,593 $ 17,826,961 $ 18,032,554 $ 11,150 Age Analysis of Past Due Loans As of December 31, 2019 30-89 90 Days or Total Past Current & Total Financing 90 Days &Accruing Commercial real estate: Owner-occupied $ 8,878 $ 11,209 $ 20,087 $ 1,181,565 $ 1,201,652 $ 544 Nonowner-occupied 6,318 16,129 22,447 3,943,513 3,965,960 471 Other commercial 5,238 51,541 56,779 2,228,258 2,285,037 668 Residential real estate 31,727 24,343 56,070 3,630,331 3,686,401 6,256 Construction & land development 2,219 16,043 18,262 1,389,943 1,408,205 0 Consumer: Bankcard 445 218 663 9,411 10,074 218 Other consumer 10,991 1,607 12,598 1,143,621 1,156,219 1,337 Total $ 65,816 $ 121,090 $ 186,906 $ 13,526,642 $ 13,713,548 $ 9,494 (1) Other includes loans with a recorded investment of $96,004 acquired and accounted for under ASC Topic 310-30
Schedule of Nonaccrual Loans, Segregated by Class of Loans	The following table sets forth United’s nonaccrual loans, segregated by class of loans: At June 30, 2020 At December 31, Interest Income Nonaccruals With No 90 Days Nonaccruals For The For The Commercial Real Estate: Owner-occupied $ 31,780 $ 26,723 $ 1,419 $ 10,665 $ 17 $ 32 Nonowner-occupied 22,506 19,882 859 15,658 1 1 Other Commercial 42,679 18,909 777 50,873 1 1 Residential Real Estate 23,649 22,022 6,234 18,087 3 3 Construction 6,804 6,759 84 16,043 0 0 Consumer: Bankcard 0 0 160 0 0 0 Other consumer 406 406 1,617 270 0 0 Total $ 127,824 $ 94,701 $ 11,150 $ 111,596 $ 22 $ 37
Schedule of Collateral Dependent Loans	For the adoption of ASU 2016-13, Collateral Dependent Loans At June 30, 2020 Residential Business Land Commercial Other Total Commercial real estate: Owner-occupied $ 2,084 $ 84 $ 0 $ 19,246 $ 28,719 $ 50,133 Nonowner-occupied 12,806 0 2,981 15,550 17,076 48,413 Other commercial 6,037 47,707 0 0 49 53,793 Residential real estate 25,104 229 255 0 0 25,588 Construction & land development 9,939 0 9,869 0 746 20,554 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total $ 55,970 $ 48,020 $ 13,105 $ 34,796 $ 46,590 $ 198,481
Schedule Of Term Loans And Financing Receivable	Commercial Real Estate – Owner-occupied Term Loans Revolving Revolving loans converted Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 107,784 $ 163,097 $ 133,255 $ 244,528 $ 304,759 $ 565,627 $ 23,576 $ 0 $ 1,542,626 Special 0 1,225 6,995 781 2,100 9,634 0 468 21,203 Substandard 1,831 72 0 2,235 4,542 50,394 1,364 149 60,587 Doubtful 0 0 0 0 0 344 0 0 344 Total $ 109,615 $ 164,394 $ 140,250 $ 247,544 $ 311,401 $ 625,999 $ 24,940 $ 617 $ 1,624,760 YTD 0 0 0 0 0 (535 ) 0 0 (535 ) YTD 0 0 0 0 0 310 0 0 310 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (225 ) $ 0 $ 0 $ (225 ) Commercial Real Estate – Nonowner-occupied Term Loans Revolving Revolving converted to term loans Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 297,474 $ 748,897 $ 685,228 $ 620,528 $ 582,809 $ 1,844,405 $ 115,345 $ 2,145 $ 4,896,831 Special Mention 0 347 0 977 10,645 27,024 0 0 38,993 Substandard 73 964 8,618 1,702 13,245 44,364 0 0 68,966 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 297,547 $ 750,208 $ 693,846 $ 623,207 $ 606,699 $ 1,915,793 $ 115,345 $ 2,145 $ 5,004,790 YTD 0 0 0 0 (690 ) (1,247 ) 0 0 (1,937 ) YTD 0 0 0 0 0 722 0 0 722 YTD $ 0 $ 0 $ 0 $ 0 $ (690 ) $ (525 ) $ 0 $ 0 $ (1,215 ) Other commercial Term Loans Revolving Revolving converted to temr loans Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 1,509,244 $ 451,574 $ 212,881 $ 150,587 $ 150,389 $ 311,422 $ 1,213,494 $ 3,071 $ 4,002,662 Special Mention 99 313 430 2,044 202 20,072 4,053 423 27,636 Substandard 0 895 2,635 2,535 11,386 48,486 16,794 404 83,135 Doubtful 0 0 0 0 0 72 0 0 72 Total $ 1,509,343 $ 452,782 $ 215,946 $ 155,166 $ 161,977 $ 380,052 $ 1,234,341 $ 3,898 $ 4,113,505 YTD 0 (11 ) (964 ) (365 ) (6 ) (5,682 ) 0 0 (7,028 ) YTD 0 42 16 3 21 332 32 0 446 YTD $ 0 $ 31 $ (948 ) $ (362 ) $ 15 $ (5,350 ) $ 32 $ 0 $ (6,582 ) Residential Real Estate Revolving Revolving converted to te rm Total Term Loans Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 324,682 $ 750,044 $ 857,069 $ 393,030 $ 347,781 $ 1,111,476 $ 476,577 $ 4,332 $ 4,264,991 Special Mention 0 271 0 226 2,349 7,014 435 0 10,295 Substandard 0 226 459 3,800 5,333 24,252 437 234 34,741 Doubtful 0 0 0 0 0 129 0 0 129 Total $ 324,682 $ 750,541 $ 857,528 $ 397,056 $ 355,463 $ 1,142,871 $ 477,449 $ 4,566 $ 4,310,156 YTD 0 0 0 0 (1 ) (889 ) 0 0 (890 ) YTD 0 0 0 101 0 201 0 0 302 YTD $ 0 $ 0 $ 0 $ 101 $ (1 ) $ (688 ) $ 0 $ 0 $ (588 ) Construction and Land Development Revolving loans converted Term Loans Revolving Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 163,253 $ 706,921 $ 375,025 $ 173,269 $ 133,679 $ 70,466 $ 102,752 $ 143 $ 1,725,510 Special Mention 0 0 1,506 0 561 2,681 995 0 5,743 Substandard 0 156 1,553 25 0 20,443 22,298 0 44,475 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 163,253 $ 707,077 $ 378,084 $ 173,294 $ 134,240 $ 93,590 $ 126,045 $ 143 $ 1,775,728 YTD 0 0 0 0 0 (1,969 ) 0 0 (1,969 ) YTD 0 0 0 0 0 1,361 0 0 1,361 YTD $ 0 $ 0 $ 0 $ 0 $ 0 $ (608 ) $ 0 $ 0 $ (608 ) Bankcard Revolving loans converted Term Loans Revolving Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 8,133 $ 8,133 Special Mention 0 0 0 0 0 0 0 172 172 Substandard 0 0 0 0 0 0 0 160 160 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 8,465 $ 8,465 YTD 0 0 0 0 0 0 0 (128 ) (128 ) YTD 0 0 0 0 0 0 0 12 12 YTD $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (116 ) $ (116 ) Other Consumer Revolving loans converted Term Loans Revolving Total Origination Year As of June 30, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 220,924 $ 494,700 $ 298,460 $ 104,779 $ 54,766 $ 14,247 $ 7,095 $ 0 $ 1,194,971 Special Mention 0 0 11 0 0 152 4 0 167 Substandard 3 0 0 0 0 9 0 0 12 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 220,927 $ 494,700 $ 298,471 $ 104,779 $ 54,766 $ 14,408 $ 7,099 $ 0 $ 1,195,150 YTD (16 ) (589 ) (652 ) (272 ) (152 ) (225 ) (2 ) 0 (1,908 ) YTD 0 24 33 11 18 124 0 0 210 YTD $ (16 ) $ (565 ) $ (619 ) $ (261 ) $ (134 ) $ (101 ) $ (2 ) $ 0 $ (1,698 )
Schedule of Credit Quality Indicators Information, by Class of Loans	The following tables set forth United’s credit quality indicators information, by class of loans, as of December 31, 2019: Credit Quality Indicators Corporate Credit Exposure As of December 31, 2019 Commercial Real Estate Other Construction & Owner- Nonowner- Grade: Pass $ 1,136,589 $ 3,850,886 $ 2,136,266 $ 1,334,950 Special mention 14,449 44,134 75,511 4,614 Substandard 50,346 70,940 72,451 68,641 Doubtful 268 0 809 0 Total $ 1,201,652 $ 3,965,960 $ 2,285,037 $ 1,408,205 Credit Quality Indicators Consumer Credit Exposure As of December 31, 2019 Residential Bankcard Other Grade: Pass $ 3,645,654 $ 9,411 $ 1,143,608 Special mention 12,038 445 10,993 Substandard 28,572 218 1,618 Doubtful 137 0 0 Total $ 3,686,401 $ 10,074 $ 1,156,219
Schedule of Reasons For Modification Troubled Debt Restructuring Loans	The following tables sets for the balances of TDRs at June 30, 2020 and December 31, 2019 and the reasons for modification: Reason for modification June 30, 2020 December 31, 2019 Interest rate reduction $ 11,662 $ 1,685 Interest rate reduction and change in terms 3,039 1,733 Forgiveness of principal 252 0 Transfer of asset 121 0 Concession of principal and term 24 0 Extended maturity 4,879 0 Change in terms 57,459 54,951 Total $ 77,436 $ 58,369
Schedule Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance	The following table sets forth United’s troubled debt restructurings, based on their post-modification outstanding recorded balance, that have been restructured during the three and six months ended June 30, 2020 and 2019, segregated by the reason for modification: Three Months Ended Six Months Ended Reason for modification June 30, June 30, June 30, June 30, Interest rate reduction $ 2,675 $ 0 $ 10,028 $ 251 Interest rate reduction and change in terms 1,326 0 1,326 0 Forgiveness of principal 252 0 252 0 Transfer of asset 121 0 121 0 Concession of principal and term 24 0 24 0 Extended maturity 4,879 0 4,879 0 Change in terms 13,112 4,743 15,763 5,146 Total $ 22,389 $ 4,743 $ 32,393 $ 5,397

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2020
Receivables [Abstract]
Schedule Of Credit Losses Related To Accrued Interest Receivables and Written Off	The following table represents the accrued interest receivable as of June 30, 2020 and the accrued interest receivables written off by reversing interest income as of June 30, 2020: Accrued Interest Accrued Interest Receivables Written Off by At June 30, 2020 For the Three Months Ended June 30, 2020 For the Six Months Commercial Real Estate: Owner-occupied $ 4,910 $ 83 $ 100 Nonowner-occupied 18,107 38 45 Other Commercial 9,350 33 45 Residential Real Estate 14,085 64 134 Construction 6,825 0 0 Consumer: Bankcard 0 0 0 Other consumer 2,847 27 67 Total $ 56,124 $ 245 $ 391
Schedule of Allowance for Loan Losses and Carrying Amount of Loans	A progression of the allowance for loan losses, by portfolio segment, for the periods indicated is summarized as follows: Allowance for Loan Losses and Carrying Amount of Loans For the Three Months Ended June 30, 2020 Commercial Real Estate Construction Allowance Owner- Nonowner- Other Residential & Land Bankcard Other Estimated Total Allowance for Loan Losses: Beginning balance $ 19,495 $ 17,569 $ 53,827 $ 30,624 $ 18,792 $ 226 $ 14,390 $ 0 $ 154,923 Initial allowance for PCD loans (acquired during the period) 1,955 6,418 7,032 652 2,570 0 8 0 18,635 Charge-offs (356 ) (1,937 ) (1,340 ) (523 ) (225 ) (82 ) (1,171 ) 0 (5,634 ) Recoveries 244 137 131 160 517 6 95 0 1,290 Provision 1,400 3,590 19,754 7,970 10,649 130 2,414 0 45,907 Ending balance $ 22,738 $ 25,777 $ 79,404 $ 38,883 $ 32,303 $ 280 $ 15,736 $ 0 $ 215,121 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2020 Commercial Real Estate Construction Allowance Owner- Nonowner- Other Residential & Land Bankcard Other Estimated Total Allowance for Loan Losses: Beginning balance $ 5,554 $ 8,524 $ 47,325 $ 8,997 $ 3,353 $ 74 $ 2,933 $ 297 $ 77,057 Impact of the adoption of ASU 2016-13 9,737 9,023 (4,829 ) 13,097 14,817 28 10,745 (297 ) 52,321 Impact of the adoption of ASU 2016-13 1,843 121 938 174 2,045 0 0 0 5,121 Initial allowance for PCD loans (acquired during the period) 1,955 6,418 7,032 652 2,570 0 8 0 18,635 Charge-offs (535 ) (1,937 ) (7,028 ) (890 ) (1,969 ) (128 ) (1,908 ) 0 (14,395 ) Recoveries 310 722 446 302 1,361 12 210 0 3,363 Provision 3,874 2,906 35,520 16,551 10,126 294 3,748 0 73,019 Ending balance $ 22,738 $ 25,777 $ 79,404 $ 38,883 $ 32,303 $ 280 $ 15,736 $ 0 $ 215,121 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2019 Commercial Real Estate Other Residential Construction & Consumer Allowance Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 5,063 $ 6,919 $ 41,341 $ 12,448 $ 7,992 $ 2,695 $ 245 $ 76,703 Charge-offs (7,905 ) (1,093 ) (12,975 ) (2,967 ) (1,303 ) (2,867 ) 0 (29,110 ) Recoveries 3,733 80 2,599 858 175 706 0 8,151 Provision 4,663 2,618 16,360 (1,342 ) (3,511 ) 2,473 52 21,313 Ending balance $ 5,554 $ 8,524 $ 47,325 $ 8,997 $ 3,353 $ 3,007 $ 297 $ 77,057 Ending Balance: individually evaluated for impairment $ 973 $ 2,979 $ 11,931 $ 354 $ 262 $ 0 $ 0 $ 16,499 Ending Balance: collectively evaluated for impairment $ 4,581 $ 5,545 $ 35,394 $ 8,643 $ 3,091 $ 3,007 $ 297 $ 60,558 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 1,201,652 $ 3,965,960 $ 2,285,037 $ 3,686,401 $ 1,408,205 $ 1,166,293 $ 0 $ 13,713,548 Ending Balance: individually evaluated for impairment $ 16,703 $ 27,121 $ 54,108 $ 11,526 $ 14,047 $ 0 $ 0 $ 123,505 Ending Balance: collectively evaluated for impairment $ 1,160,556 $ 3,925,249 $ 2,194,432 $ 3,665,140 $ 1,382,369 $ 1,166,293 $ 0 $ 13,494,039 Ending Balance: loans acquired with deteriorated credit quality $ 24,393 $ 13,590 $ 36,497 $ 9,735 $ 11,789 $ 0 $ 0 $ 96,004

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following is a summary of intangible assets subject to amortization and those not subject to amortization: June 30, 2020 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 101,396 $ (72,738 ) $ 0 $ 0 $ 101,396 $ (72,738 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Crescent Mortgage trade name 0 1,370 1,370 Total $ 0 $ 2,450 $ 2,450 Goodwill not subject to amortization $ 1,789,464 $ 5,315 $ 1,794,779 December 31, 2019 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 98,359 $ (69,508 ) $ 0 $ 0 $ 98,359 $ (69,508 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Goodwill not subject to amortization $ 1,472,699 $ 5,315 $ 1,478,014
Reconciliation of Goodwill	The following table provides a reconciliation of goodwill: Community Mortgage Total Goodwill at December 31, 2019 $ 1,472,699 $ 5,315 $ 1,478,014 Preliminary addition to goodwill from Carolina Financial acquisition 316,765 0 316,765 Goodwill at June 30, 2020 $ 1,789,464 $ 5,315 $ 1,794,779
Schedule of Anticipated Amortization Expense	The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2019: Year Amount 2020 $ 6,612 2021 5,780 2022 4,939 2023 4,641 2024 and thereafter 9,916

Mortage Servicing Rights (Table

Mortage Servicing Rights (Tables)	6 Months Ended
	Jun. 30, 2020
Servicing Asset [Abstract]
Summary of Activity in Mortgage Servicing Rights	The following presents the activity in mortgage servicing rights, including their valuation allowance for the three and six months ended June 30, 2020: Three Months Six Months MSRs beginning balance $ 0 $ 0 Addition from acquisition of subsidiary 20,123 20,123 Amount capitalized 1,891 1,891 Purchased servicing 0 0 Amount amortized (1,104 ) (1,104 ) MSRs ending balance $ 20,910 $ 20,910 MSRs valuation allowance beginning balance $ 0 $ 0 MSRs impairment (710 ) (710 ) MSRs valuation allowance ending balance $ (710 ) $ (710 ) MSRs, net of valuation allowance $ 20,200 $ 20,200

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2020
Leases [Abstract]
Components of Lease Expense	The components of lease expense were as follows: Three Months Ended Three Months Ended Classification June 30, 2020 June 30, 2019 Operating lease cost Net occupancy expense $ 5,895 $ 4,886 Sublease income Net occupancy expense (189 ) (197 ) Net lease cost $ 5,706 $ 4,689 Six Months Ended Six Months Ended Classification June 30, 2020 June 30, 2019 Operating lease cost Net occupancy expense $ 10,961 $ 9,707 Sublease income Net occupancy expense (394 ) (473 ) Net lease cost $ 10,567 $ 9,234
Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows: Classification June 30, 2020 December 31, 2019 Operating lease right-of-use Operating lease right-of-use assets $ 70,655 $ 57,783 Operating lease liabilities Operating lease liabilities $ 74,435 $ 61,342
Other Information Related to Leases	Other information related to leases was as follows: June 30, 2020 Weighted-average remaining lease term: Operating leases 5.5 years Weighted-average discount rate: Operating leases 2.68 %
Supplemental Cash Flow Information Related to Leases	Supplemental cash flow information related to leases was as follows: Three Months Ended June 30, 2020 June 30, 2019 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 5,722 $ 4,931 ROU assets obtained in the exchange for lease liabilities 8,549 4,214 Six Months Ended June 30, 2020 June 30, 2019 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 10,739 $ 9,649 ROU assets obtained in the exchange for lease liabilities 12,332 4,416
Maturities of Lease Liabilities by Year	Maturities of lease liabilities by year and in the aggregate, under operating leases with initial or remaining terms of one year or more, for years subsequent to December 31, 2019, consists of the following as of June 30, 2020 and December 31, 2019: Amount Year As of June 30, 2020 As of December 31, 2019 2020 $ 10,670 17,725 2021 18,884 15,180 2022 14,782 11,522 2023 11,412 8,751 2024 7,264 5,127 Thereafter 16,909 8,190 Total lease payments 79,921 66,495 Less: imputed interest (5,486 ) (5,153 ) Total $ 74,435 $ 61,342

Long-Term Borrowings (Tables)

Long-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2020
Debt Disclosure [Abstract]
Schedule of Maturities of Long-term Borrowings	The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2020 $ 495,170 2021 827,724 2022 20,989 2023 0 2024 and thereafter 10,996 Total $ 1,354,879

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amount and Fair Value of Derivative Financial Instruments	The following tables disclose the derivative instruments’ location on the Company’s Consolidated Balance Sheets and the notional amount and fair value of those instruments at June 30, 2020 and December 31, 2019. Asset Derivatives June 30, 2020 December 31, 2019 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives not designated as hedging instruments Forward loan sales commitments Other $ 73,432 $ 1,745 Other $ 27,260 $ 9 Interest rate lock commitments Other assets 878,925 27,833 Other assets 117,252 4,518 Total derivatives not designated as hedging instruments $ 952,357 $ 29,578 $ 144,512 $ 4,527 Total asset derivatives $ 952,357 $ 29,578 $ 144,512 $ 4,527 Liability Derivatives June 30, 2020 December 31, 2019 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives designated as hedging instruments Fair Value Hedges: Interest rate swap contracts (hedging commercial loans) Other liabilities $ 79,225 $ 8,424 Other liabilities $ 82,243 $ 2,394 Total Fair Value Hedges $ 79,225 $ 8,424 $ 82,243 $ 2,394 Cash Flow Hedge: Interest rate swap contract (hedging FHLB borrowing) Other liabilities $ 250,000 $ 1,659 Other liabilities $ 0 $ 0 Total Cash Flow Hedge $ 250,000 $ 1,659 $ 0 $ 0 Total derivatives designated as hedging instruments $ 329,225 $ 10,083 $ 82,243 $ 2,394 Liability Derivatives June 30, 2020 December 31, 2019 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives not designated as hedging instruments TBA mortgage-backed securities Other $ 186,500 $ 4,224 Other $ 274,000 $ 671 Total derivatives not designated as hedging instruments $ 186,500 $ 4,224 $ 274,000 $ 671 Total liability derivatives $ 515,725 $ 14,307 $ 356,243 $ 3,065
Summary of Carrying Amount Hedged Assets/(Liabilities)	The following table represents the carrying amount of the hedged assets/(liabilities) and the cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged assets/(liabilities) that are designated as a fair value accounting relationship as of June 30, 2020 and December 31, 2019. Derivatives in Fair Value Hedging Relationships Location in the Statement June 30, 2020 Carrying Amount Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 80,048 $ (8,424 ) $ 0 Derivatives in Fair Value Hedging Relationships Location in the Statement December 31, 2019 Carrying Amount Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 81,397 $ (2,394 ) $ 0
Schedule of Derivative Financial Instruments on Statement of Income	The effect of United’s derivative financial instruments on its unaudited Consolidated Statements of Income for the three and six months ended June 30, 2020 and 2019 are presented as follows: Three Months Ended Income Statement Location June 30, June 30, Derivatives in hedging relationships Fair Value Hedges: Interest rate swap contracts Interest and fees on loans $ (277 ) $ (68 ) Total derivatives in hedging relationships $ (277 ) $ (68 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities (553 ) 492 TBA mortgage-backed securities Income from Mortgage Banking Activities 17,204 (962 ) Interest rate lock commitments Income from Mortgage Banking Activities (1,527 ) 3,833 Total derivatives not designated as hedging instruments $ 15,124 $ 3,363 Total derivatives $ 14,847 $ 3,295 Six Months Ended Income Statement Location June 30, June 30, Derivatives in fair value hedging relationships Fair Value Hedges: Interest rate swap contracts Interest and fees on loans $ (720 ) $ (98 ) Total derivatives in hedging relationships $ (720 ) $ (98 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities 207 872 TBA mortgage-backed securities Income from Mortgage Banking Activities (1,771 ) (474 ) Interest rate lock commitments Income from Mortgage Banking Activities 12,169 5,870 Total derivatives not designated as hedging instruments $ 10,605 $ 6,268 Total derivatives $ 9,885 $ 6,170

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Schedule of Financial Assets and Liabilities Measured at Fair Value	The following tables present the balances of financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2020 and December 31, 2019, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2020 Using Description Balance as of June 30, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale debt securities: U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 67,303 $ 0 $ 67,303 $ 0 State and political subdivisions 520,880 0 520,880 0 Residential mortgage-backed securities Agency 848,231 0 848,231 0 Non-agency 62,965 0 62,965 0 Commercial mortgage-backed securities Agency 622,785 0 622,785 0 Asset-backed securities 277,721 0 277,721 0 Trust preferred collateralized debt obligations 12,837 0 0 12,837 Single issue trust preferred securities 16,191 0 16,191 0 Other corporate securities 371,028 6,432 364,596 0 Total available for sale securities 2,799,941 6,432 2,780,672 12,837 Equity securities: Financial services industry 103 103 0 0 Equity mutual funds (1) 3,783 3,783 0 0 Other equity securities 5,989 5,989 0 0 Total equity securities 9,875 9,875 0 0 Loans held for sale 611,277 0 45,480 565,797 Derivative financial assets: Forward sales commitments 1,745 0 1,745 0 Interest rate lock commitments 27,833 0 7,413 20,420 Total derivative financial assets 29,578 0 9,158 20,420 Liabilities Derivative financial liabilities: Interest rate swap contracts 10,083 0 10,083 0 TBA mortgage-backed securities 4,224 0 4,224 0 Total derivative financial liabilities 14,307 0 14,307 0 (1) The equity mutual funds are within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries. Fair Value at December 31, 2019 Using Description Balance as of December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale debt securities: U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 58,676 $ 0 $ 58,676 $ 0 State and political subdivisions 272,362 0 272,362 0 Residential mortgage-backed securities Agency 836,534 0 836,534 0 Non-agency 3,833 0 3,833 0 Commercial mortgage-backed securities Agency 614,973 0 614,973 0 Asset-backed securities 276,139 0 276,139 0 Trust preferred collateralized debt obligations 4,703 0 0 4,703 Single issue trust preferred securities 16,774 0 16,774 0 Other corporate securities 353,302 6,586 346,716 0 Total available for sale securities 2,437,296 6,586 2,426,007 4,703 Equity securities: Financial services industry 154 154 0 0 Equity mutual funds (1) 3,971 3,971 0 0 Other equity securities 4,769 4,769 0 0 Total equity securities 8,894 8,894 0 0 Loans held for sale 384,375 0 0 384,375 Derivative financial assets: Interest rate swap contracts 9 0 9 0 Forward sales commitments 4,518 0 0 4,518 Total derivative financial assets 4,527 0 9 4,518 Liabilities Derivative financial liabilities: 2,394 0 2,394 0 TBA mortgage-backed securities 671 0 671 0 Total derivative financial liabilities 3,065 0 3,065 0 (1) The equity mutual funds are within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries.
Schedule of Additional Information about Financial Assets and Liabilities Measured at Fair Value Utilized Level 3	The following table presents additional information about financial assets and liabilities measured Available for sale Securities Trust preferred collateralized debt obligations June 30, 2020 December 31, Balance, beginning of period $ 4,703 $ 5,917 Total gains or losses (realized/unrealized): Included in earnings (or changes in net assets) 0 (155 ) Included in other comprehensive income 2,318 (1,059 ) Acquired in Carolina Financial merger 5,816 0 Balance, end of period $ 12,837 $ 4,703 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ 0 $ 0 Loans held for sale June 30, 2020 December 31, Balance, beginning of period $ 384,375 $ 247,104 Originations 2,363,759 2,941,722 Sales (2,261,049 ) (2,888,257 ) Total gains or losses during the period recognized in earnings 78,712 83,806 Balance, end of period $ 565,797 $ 384,375 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ 0 $ 0 Derivative Financial Assets Interest Rate Lock June 30, 2020 December 31, Balance, beginning of period $ 4,518 $ 4,103 Transfers other 15,902 415 Balance, end of period $ 20,420 $ 4,518 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ 0 $ 0
Schedule of Changes in Fair Value Included in Earnings of Financial Instruments for which Fair Value Option has been Elected	The following table reflects the change in fair value included in earnings of financial instruments for which the fair value option has been elected: Description Three Months Ended June 30, 2020 Three Months Ended June 30, 2019 Assets Loans held for sale Income from mortgage banking activities $ 8,846 $ 4,578 Description Six Months Ended June 30, 2020 Six Months Ended June 30, 2019 Assets Loans held for sale Income from mortgage banking activities $ 10,471 $ 6,542
Summary of Difference Between Aggregate Fair Value and Remaining Contractual Principal Outstanding for Financial Instruments for which Fair Value Option has been Elected	The following table reflects the difference between the aggregate fair value and the remaining contractual principal outstanding for financial instruments for which the fair value option has been elected: June 30, 2020 December 31, 2019 Description Unpaid Fair Value Fair Value r / Unpaid Fair Value Fair Value Assets Loans held for sale $ 591,397 $ 611,277 $ 19,880 $ 375,274 $ 384,375 $ 9,101
Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis	The following table summarizes United’s financial assets that were measured at fair value on a nonrecurring basis during the period: Carrying value at June 30, 2020 Description Balance as of June 30, Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD (Losses) Assets Loans held for sale $ 14,707 $ 0 $ 14,707 $ 0 $ (2 ) Individually assessed loans 59,488 0 49,732 9,756 568 OREO 29,947 0 29,898 49 (440 ) Mortgage servicing rights 20,200 0 0 20,200 (710 ) Carrying value at December 31, 2019 Description Balance as of December 31, Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD (Losses) Assets Loans held for sale $ 3,139 $ 0 $ 3,139 $ 0 $ (4 ) Impaired Loans 68,213 0 55,792 12,421 1,831 OREO 15,515 0 15,495 20 (785 )
Summary of Estimated Fair Values of Financial Instruments	The estimated fair values of United’s financial instruments are summarized below: Fair Value Measurements Carrying Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) June 30, 2020 Cash and cash equivalents $ 2,062,813 $ 2,062,813 $ 0 $ 2,062,813 $ 0 Securities available for sale 2,799,941 2,799,941 6,432 2,780,672 12,837 Securities held to maturity 1,221 1,220 0 200 1,020 Equity securities 9,875 9,875 9,875 0 0 Other securities 251,161 238,603 0 0 238,603 Loans held for sale 625,984 625,984 0 60,187 565,797 Net loans 17,777,281 17,191,993 0 0 17,191,993 Derivative financial assets 29,578 29,578 0 9,158 20,420 Mortgage servicing rights 20,200 20,200 0 0 20,200 Deposits 19,893,843 19,902,498 0 19,902,498 0 Short-term borrowings 176,168 176,168 0 176,168 0 Long-term borrowings 1,633,891 1,597,685 0 1,597,685 0 Derivative financial liabilities 14,307 14,307 0 14,307 0 December 31, 2019 Cash and cash equivalents $ 837,493 $ 837,493 $ 0 $ 837,493 $ 0 Securities available for sale 2,437,296 2,437,296 6,586 2,426,007 4,703 Securities held to maturity 1,446 1,447 0 427 1,020 Equity securities 8,894 8,894 8,894 0 0 Other securities 222,161 211,053 0 0 211,053 Loans held for sale 387,514 387,514 0 3,139 384,375 Net loans 13,635,072 13,185,955 0 0 13,185,955 Derivative financial assets 4,527 4,527 0 9 4,518 Deposits 13,852,421 13,843,077 0 13,843,077 0 Short-term borrowings 374,654 374,654 0 374,654 0 Long-term borrowings 1,838,029 1,820,297 0 1,820,297 0 Derivative financial liabilities 3,065 3,065 0 3,065 0

Stock Based Compensation (Table

Stock Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option Plans	A summary of activity under United’s stock option plans as of June 30, 2020, and the changes during the first six months of 2020 are presented below: Six Months Ended June 30, 2020 Weighted Average Aggregate Remaining Intrinsic Contractual Exercise Shares Value Term (Yrs.) Price Outstanding at January 1, 2020 1,715,316 $ 34.49 Assumed in Carolina Financial merger 117,116 12.14 Granted 183,551 32.51 Exercised (14,994 ) 20.48 Forfeited or expired (8,915 ) 28.47 Outstanding at June 30, 2020 1,992,074 $ 2,513 5.5 $ 33.13 Exercisable at June 30, 2020 1,446,719 $ 2,513 4.4 $ 31.67
Status of United's Nonvested Stock Option Awards	The following table summarizes the status of United’s nonvested stock option awards during the first six months of 2020: Shares Weighted-Average Nonvested at January 1, 2020 589,737 $ 7.62 Granted 183,551 5.65 Vested (225,582 ) 7.68 Forfeited or expired (2,351 ) 7.32 Nonvested at June 30, 2020 545,355 $ 6.93
Changes to United's Restricted Common Shares	The following summarizes the changes to United’s restricted common shares for the period ended June 30, 2020: Number of Weighted-Average Outstanding at January 1, 2020 247,896 $ 39.20 Granted 175,495 32.51 Vested (88,671 ) 39.32 Forfeited (946 ) 36.58 Outstanding at June 30, 2020 333,774 $ 35.66

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2020
Retirement Benefits [Abstract]
Net Periodic Pension Cost	Net periodic pension cost for the three and six months ended June 30, 2020 and 2019 included the following components : Three Months Ended June 30 Six Months Ended June 30 2020 2019 2020 2019 Service cost $ 715 $ 561 $ 1,430 $ 1,116 Interest cost 1,286 1,459 2,573 2,901 Expected return on plan assets (2,630 ) (2,356 ) (5,259 ) (4,686 ) Recognized net actuarial loss 1,442 1,184 2,884 2,355 Net periodic pension cost $ 813 $ 848 $ 1,628 $ 1,686 Weighted-Average Assumptions: Discount rate 3.42 % 4.52 % 3.42 % 4.52 % Expected return on assets 6.75 % 7.00 % 6.75 % 7.00 % Rate of c i 5.00 % n/a 5.00 % n/a Rate of c i 40-54) 4.00 % n/a 4.00 % n/a Rate of compensation increase (prior to age 45) n/a 3.50 % n/a 3.50 % Rate of compensation increase (otherwise) 3.50 % 3.00 % 3.50 % 3.00 %

Comprehensive Income (Tables)

Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2020
Equity [Abstract]
Components of Total Comprehensive Income	The components of total comprehensive income for the three and six months ended June 30, 2020 and 2019 are as follows: Three Months Ended Six Months Ended June 30 June 30 2020 2019 2020 2019 Net Income $ 52,686 $ 67,207 $ 92,869 $ 130,849 Available for sale (“AFS”) securities: AFS securities with OTTI charges during the period 0 (75 ) 0 (75 ) Related income tax effect 0 17 0 17 Less: OTTI charges recognized in net income 0 75 0 75 Related income tax benefit 0 (17 ) 0 (17 ) Reclassification of previous noncredit OTTI to credit OTTI 0 2,188 0 2,188 Related income tax benefit 0 (510 ) 0 (510 ) Net unrealized (losses) gains on AFS securities with OTTI 0 1,678 0 1,678 AFS securities – all other: Change in net unrealized gain on AFS securities arising during the period 37,756 21,141 60,859 43,379 Related income tax effect (8,797 ) (4,925 ) (14,180 ) (10,107 ) Net reclassification adjustment for (gains) losses included in net income (1,466 ) 130 (1,641 ) (218 ) Related income tax expense (benefit) 341 (30 ) 382 51 27,834 16,316 45,420 33,105 Net effect of AFS securities on other comprehensive income 27,834 17,994 45,420 34,783 Cash flow hedge derivatives: Unrealized loss (1,659 ) 0 (1,659 ) 0 Related income tax effect 387 0 387 0 Net effect of cash flow hedge derivatives on other comprehensive income (1,272 ) 0 (1,272 ) 0 Pension plan: Recognized net actuarial loss 1,442 1,184 2,884 2,355 Related income tax benefit (329 ) (275 ) (659 ) (536 ) Net effect of change in pension plan asset on other comprehensive income 1,113 909 2,225 1,819 Total change in other comprehensive income 27,675 18,903 46,373 36,602 Total Comprehensive Income $ 80,361 $ 86,110 $ 139,242 $ 167,451
Components of Accumulated Other Comprehensive Income	The components of accumulated other comprehensive income for the six months ended June 30, 2020 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2020 Unrealized Unrealized Defined Benefit Items Total Balance at January 1, 2020 $ 7,956 $ 0 $ (42,825 ) $ (34,869 ) Other comprehensive income before reclassification 46,679 (1,272 ) 0 45,407 Amounts reclassified from accumulated other comprehensive income (1,259 ) 0 2,225 966 Net current-period other comprehensive income, net of tax 45,420 (1,272 ) 2,225 46,373 Balance at June 30, 2020 $ 53,376 $ (1,272 ) $ (40,600 ) $ 11,504
Reclassifications Out of Accumulated Other Comprehensive Income	Reclassifications out of Accumulated Other Comprehensive Income (AOCI) For the Six Months Ended June 30, 2020 Details about AOCI Components Amount Affected Line Item in the Statement Where Net Income is Presented Available for sale (“AFS”) securities: Net reclassification adjustment for losses (gains) included in net income $ (1,641 ) Net investment securities (losses) gains (1,641 ) Total before tax Related income tax effect 382 Tax expense (1,259 ) Net of tax Cash flow hedge: Net reclassification adjustment for losses (gains) included in net income $ 0 Other income (expense) 0 Total before tax Related income tax effect 0 Tax expense Pension plan: Recognized net actuarial loss 2,884 (a ) 2,884 Total before tax Related income tax effect (659) Tax expense 2,225 Total rec lassifications for the period $ 966 (a)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2020
Earnings Per Share [Abstract]
Reconciliation of Numerator and Denominator of Basic Earnings Per Share with that of Diluted Earnings Per Share	The reconciliation of the numerator and denominator of basic earnings per share with that of diluted earnings per share is presented as follows: Three Months Ended Six Months Ended June 30 June 30 2020 2019 2020 2019 Distributed earnings allocated to common stock $ 45,298 $ 34,604 $ 80,785 $ 69,276 Undistributed earnings allocated to common stock 7,262 32,446 11,840 61,276 Net earnings allocated to common shareholders $ 52,560 $ 67,050 $ 92,625 $ 130,552 Average common shares outstanding 119,823,652 101,773,643 110,559,363 101,833,880 Equivalents from stock options 64,171 274,202 65,613 265,929 Average diluted shares outstanding 119,887,823 102,047,845 110,624,976 102,099,809 Earnings per basic common share $ 0.44 $ 0.66 $ 0.84 $ 1.28 Earnings per diluted common share $ 0.44 $ 0.66 $ 0.84 $ 1.28

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Information Related to Statutory Trusts	Information related to United’s statutory trusts is presented in the table below: Description Issuance Date Amount of Stated Interest Rate Maturity Date United Statutory Trust III December 17, 2003 $ 20,000 3-month December 17, 2033 United Statutory Trust IV December 19, 2003 $ 25,000 3-month January 23, 2034 United Statutory Trust V July 12, 2007 $ 50,000 3-month October 1, 2037 United Statutory Trust VI September 20, 2007 $ 30,000 3-month December 15, 2037 Premier Statutory Trust II September 25, 2003 $ 6,000 3-month October 8, 2033 Premier Statutory Trust III May 16, 2005 $ 8,000 3-month June 15, 2035 Premier Statutory Trust IV June 20, 2006 $ 14,000 3-month September 23, 2036 Premier Statutory Trust V December 14, 2006 $ 10,000 3-month March 1, 2037 Centra Statutory Trust I September 20, 2004 $ 10,000 3-month September 20, 2034 Centra Statutory Trust II June 15, 2006 $ 10,000 3-month July 7, 2036 Virginia Commerce Trust II December 19, 2002 $ 15,000 6-month December 19, 2032 Virginia Commerce Trust III December 20, 2005 $ 25,000 3-month February 23, 2036 Cardinal Statutory Trust I July 27, 2004 $ 20,000 3-month September 15, 2034 UFBC Capital Trust I December 30, 2004 $ 5,000 3-month March 15, 2035 Carolina Financial Capital Trust I December 19, 2002 $ 5,000 Prime + 0.50% December 31, 2032 Carolina Financial Capital Trust II November 5, 2003 $ 10,000 3-month January 7, 2034 Greer Capital Trust I October 12, 2004 $ 6,000 3-month October 18, 2034 Greer Capital Trust II December 28, 2006 $ 5,000 3-month January 30, 2037 First South Preferred Trust I September 26, 2003 $ 10,000 3-month September 30, 2033
Summary of Quantitative Information Related to Significant Involvement in Unconsolidated Variable Interest Entities	The following table summarizes quantitative information about United’s significant involvement in unconsolidated VIEs: As of June 30, 2020 As of December 31, 2019 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 295,263 $ 284,657 $ 10,606 $ 257,941 $ 248,680 $ 9,261 (1)   Represents investment in VIEs.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2020
Segment Reporting [Abstract]
Summary of Segment Reporting Information	Information about the reportable segments and reconciliation of this information to the consolidated financial statements at and for the three and six months ended June 30, 2020 and 2019 is as follows: At and For the Three Months Ended June 30, 2020 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 167,703 $ 2,246 $ (2,556 ) $ 3,209 $ 170,602 Provision for loans losses 45,911 0 0 0 45,911 Other income 20,301 71,013 47 (2,971 ) 88,390 Other expense 106,477 35,261 7,398 238 149,374 Income taxes 5,841 6,946 (1,766 ) 0 11,021 Net income (loss) $ 29,775 $ 31,052 $ (8,141 ) $ 0 $ 52,686 Total assets (liabilities) $ 25,924,599 $ 730,637 $ 25,678 $ (445,941 ) $ 26,234,973 Average assets (liabilities) 24,198,414 660,483 16,574 (472,871 ) 24,402,600 At and For the Three Months Ended June 30, 2019 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 152,517 $ 111 $ (3,209 ) $ 1,134 $ 150,553 Provision for loans losses 5,417 0 0 0 5,417 Other income 18,398 23,501 53 (2,157 ) 39,795 Other expense 82,304 18,771 143 (1,023 ) 100,195 Income taxes 17,207 1,004 (682 ) 0 17,529 Net income (loss) $ 65,987 $ 3,837 $ (2,617 ) $ 0 $ 67,207 Total assets (liabilities) $ 19,735,901 $ 442,188 $ 16,729 $ (312,279 ) $ 19,882,539 Average assets (liabilities) 19,447,629 326,525 5,387 (263,687 ) 19,515,854 At and For the Six Months Ended June 30, 2020 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 308,123 $ 3,195 $ (5,245 ) $ 6,047 $ 312,120 Provision for loans losses 73,030 0 0 0 73,030 Other income 39,868 92,203 56 (6,931 ) 125,196 Other expense 186,941 56,018 8,432 (884 ) 250,507 Income taxes 16,191 7,219 (2,500 ) 0 20,910 Net income (loss) $ 71,829 $ 32,161 $ (11,121 ) $ 0 $ 92,869 Total assets (liabilities) $ 25,924,599 $ 730,637 $ 25,678 $ (445,941 ) $ 26,234,973 Average assets (liabilities) 21,825,005 513,431 21,756 (374,811 ) 21,985,381 At and For the Six Months Ended June 30, 2019 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 298,407 $ 166 $ (6,532 ) $ 2,680 $ 294,721 Provision for loans losses 10,413 0 0 0 10,413 Other income 36,050 39,607 255 (4,894 ) 71,018 Other expense 158,298 33,613 (77 ) (2,214 ) 189,620 Income taxes 34,873 1,286 (1,302 ) 0 34,857 Net income (loss) $ 130,873 $ 4,874 $ (4,898 ) $ 0 $ 130,849 Total assets (liabilities) $ 19,735,901 $ 442,188 $ 16,729 $ (312,279 ) $ 19,882,539 Average assets (liabilities) 19,324,956 296,008 1,824 (239,281 ) 19,383,507

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 01, 2020	Aug. 31, 2017	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Held-to-maturity securities, transferred security, at carrying value			$ 0	$ 11,544
Retained earnings			$ 1,100,097		$ 1,132,579
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ (44,331)
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses	57,442
Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Held-to-maturity securities, transferred security, at carrying value		$ 11,544
Decrease in AOCI due to transfer of held to maturity securities		$ 1,098
Accounting Standards Update 2018-10 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net lease assets	67,040
Net lease liabilities	70,692
Effect on retained earnings	$ 1,049

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands	May 01, 2020USD ($)$ / sharesshares	Nov. 17, 2019$ / shares	Jun. 30, 2020USD ($)$ / shares	Jun. 30, 2020USD ($)$ / shares	Jun. 30, 2020USD ($)$ / shares	Dec. 31, 2019USD ($)$ / shares
Business Acquisition [Line Items]
Par value of Share | $ / shares			$ 2.50	$ 2.50	$ 2.50	$ 2.50
Total assets at consummation			$ 26,234,973	$ 26,234,973	$ 26,234,973	$ 19,662,324
Loans at consummation			18,032,554	18,032,554	18,032,554	$ 13,713,548
Business combination intangible assets acquired goodwill					316,765
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments for assets with credit deterioration				$ 18,635	$ 18,635
Carolina Financial [Member]
Business Acquisition [Line Items]
Conversion of Option to acquire common stock exchange ratio		1.13
Business Acquisition, Share Price | $ / shares	$ 29.11
Conversion of stock award to acquire common stock exchange ratio		1.13
Total assets at consummation	$ 5,005,744
Loans at consummation	3,292,635
Deposits at consummation	3,873,183
Business combination aggregate purchase consideration	817,877
Business combination purchase consideration equity shares issued or issuable value	815,997
Business combination stock options issued	1,833
Business combination cash consideration	$ 47
Business combination number of shares issued | shares	28,031,501
Business combination intangible assets acquired goodwill	$ 316,765
Business combination intangible assets acquired other than goodwill core deposit intangibles finite lived	3,037
Business combination intangible assets acquired other than goodwill indefinite lived	1,370
Business combination expected tax deductible goodwill	0
Business acquisition loans purchase deterioration credit loans acquired discount due to diiferences in purchase consideration	$ 10,259
Business acquisition weighted average remaining useful life of purchase credit deterioration of loans					4 years 7 months 6 days
Business acquisition weighted average remaining useful life of non purchase credit deterioration of loans					7 years 3 months 18 days
Business acquisition revenue of the acquiree included in the total revenue since the date of acquisition			40,419
Business acquisition net income of the acquiree included in the total revenue since the date of acquisition			$ 22,858
Business acquisition, percentage of voting interests acquired	100.00%
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments for assets with credit deterioration	$ 18,635
Carolina Financial [Member] | Including Unfunded Commitements [Member]
Business Acquisition [Line Items]
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments	50,562
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments for assets with credit deterioration	19,797
Carolina Financial [Member] | Loans Acquired [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration	51,553
Carolina Financial [Member] | Securities Investment [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration	562
Carolina Financial [Member] | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration [Member]
Business Acquisition [Line Items]
Business acquisition fair value of non purchase credit deteroration loans acquired	41,294
Business acquisition increase in expected credit losses	28,948
Carolina Financial [Member] | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration [Member] | Including Unfunded Commitements [Member]
Business Acquisition [Line Items]
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments	30,765
Carolina Financial [Member] | Interest-bearing Deposits [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration	12,818
Business combination interest bearing deposits acquired remaining term on the premium paid					5 years 1 month 6 days
Carolina Financial [Member] | Building [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration	8,848
Business combination finite lived tangible assets remaining useful life on premium paid					31 years 6 months
Carolina Financial [Member] | Other Real Estate Owned [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration	272
Carolina Financial [Member] | Land [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration	4,960
Carolina Financial [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration	4,831
Business combination unamortized discount on trust preferred securities					16 years 9 months 29 days
Carolina Financial [Member] | Subordinated Debt [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration	135
Business combination unamortized discount on debt useful life					6 years 9 months
Carolina Financial [Member] | Federal Home Loan Bank Advances [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration	$ 468
Business combination unamortized discount on debt useful life					6 months 29 days
Carolina Financial [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Stock issued during period merger conversion ratio		1.13
Par value of Share | $ / shares		$ 2.50
Series of Individually Immaterial Business Acquisitions [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Business Acquisition, Share Price | $ / shares		$ 28.99

Mergers and Acquisitions - Summ

Mergers and Acquisitions - Summary of Reconciliation of Difference Between Purchase Price and Par Value of Purchase Credit Loans Acquired (Detail) - USD ($) $ in Thousands	May 01, 2020	Jun. 30, 2020	Jun. 30, 2020
Disclosure Detail of Reconciliation of Difference Between Purchase Price and Par Value of Purchase Credit Loans Acquired [Line Items]
Allowance for credit losses at acquisition		$ 18,635	$ 18,635
Carolina Financial [Member]
Disclosure Detail of Reconciliation of Difference Between Purchase Price and Par Value of Purchase Credit Loans Acquired [Line Items]
Purchase price of PCD loans at acquisition	$ 1,053,014
Allowance for credit losses at acquisition	18,635
Non-credit discount at acquisition	10,259
Par value (UPB) of acquired PCD loans at acquisition	$ 1,081,908

Mergers and Acquisitions - Su_2

Mergers and Acquisitions - Summary of Business Acquisitions, by Acquisition (Detail) - USD ($) $ in Thousands	May 01, 2020	Jun. 30, 2020	Dec. 31, 2019
Identifiable liabilities:
Preliminary resulting goodwill		$ 1,794,779	$ 1,478,014
Carolina Financial [Member]
Purchase price:
Value of common shares issued	$ 815,997
Fair value of stock options assumed	1,833
Cash for fractional shares	47
Total purchase price	817,877
Identifiable assets:
Cash and cash equivalents	629,154
Investment securities	580,849
Loans held for sale	65,757
Net Loans	3,242,812
Premises and equipment	83,859
Operating lease right-of-use asset	9,861
Crescent Mortgage trade name intangible	1,370
Core deposit intangible	3,037
Mortgage servicing rights	20,123
Other assets	166,175
Total identifiable assets	4,802,997
Identifiable liabilities:
Deposits	3,884,977
Short-term borrowings	332,000
Long-term borrowings	42,738
Operating lease liability	9,861
Other liabilities	32,309
Total identifiable liabilities	4,301,885
Preliminary fair value of net assets acquired including identifiable intangible assets	501,112
Preliminary resulting goodwill	$ 316,765

Mergers and Acquisitions - Su_3

Mergers and Acquisitions - Summary of Business Acquisitions, by Acquisition (Parenthetical) (Detail)	May 01, 2020shares
Carolina Financial [Member]
Business Acquisition [Line Items]
Business combination shares issued during the year	28,031,501

Mergers and Acquisitions - Su_4

Mergers and Acquisitions - Summary Of Operating Cost Savings And Other Business Synergies (Detail) - Carolina Financial [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition ProForma Information [Line Items]
Total Revenues	$ 485,327	$ 461,393
Net Income	$ 71,420	$ 165,930

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Amortized Cost	$ 2,730,350	$ 2,426,924
Gross Unrealized Gains	90,769	28,912
Gross Unrealized Losses	21,178	18,540
Allowance For Credit Losses	0
Estimated Fair Value	2,799,941	2,437,296
Cumulative OTTI in AOCI		928
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	66,394	58,127
Gross Unrealized Gains	912	555
Gross Unrealized Losses	3	6
Allowance For Credit Losses	0
Estimated Fair Value	67,303	58,676
Cumulative OTTI in AOCI		0
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Amortized Cost	502,293	272,014
Gross Unrealized Gains	18,823	3,644
Gross Unrealized Losses	236	3,296
Allowance For Credit Losses	0
Estimated Fair Value	520,880	272,362
Cumulative OTTI in AOCI		0
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	819,073	826,857
Gross Unrealized Gains	29,209	10,923
Gross Unrealized Losses	51	1,246
Allowance For Credit Losses	0
Estimated Fair Value	848,231	836,534
Cumulative OTTI in AOCI		0
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	61,954	3,429
Gross Unrealized Gains	1,011	404
Gross Unrealized Losses	0	0
Allowance For Credit Losses	0
Estimated Fair Value	62,965	3,833
Cumulative OTTI in AOCI		86
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	591,303	609,461
Gross Unrealized Gains	31,581	8,319
Gross Unrealized Losses	99	2,807
Allowance For Credit Losses	0
Estimated Fair Value	622,785	614,973
Cumulative OTTI in AOCI		0
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	293,293	284,390
Gross Unrealized Gains	0	0
Gross Unrealized Losses	15,572	8,251
Allowance For Credit Losses	0
Estimated Fair Value	277,721	276,139
Cumulative OTTI in AOCI		0
Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	11,895	6,045
Gross Unrealized Gains	2,644	0
Gross Unrealized Losses	1,702	1,342
Allowance For Credit Losses	0
Estimated Fair Value	12,837	4,703
Cumulative OTTI in AOCI		842
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	18,211	18,196
Gross Unrealized Gains	159	170
Gross Unrealized Losses	2,179	1,592
Allowance For Credit Losses	0
Estimated Fair Value	16,191	16,774
Cumulative OTTI in AOCI		0
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost	365,934	348,405
Gross Unrealized Gains	6,430	4,897
Gross Unrealized Losses	1,336	0
Allowance For Credit Losses	0
Estimated Fair Value	$ 371,028	353,302
Cumulative OTTI in AOCI		$ 0

Investment Securities - Summa_2

Investment Securities - Summary of Securities Available for Sale in an Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 165,904	$ 564,710
Less than 12 months, Unrealized Losses	2,399	10,569
12 months or longer, Fair Value	272,439	274,399
12 months or longer, Unrealized Losses	18,779	7,971
Total, Fair Value	438,343	839,109
Total, Unrealized Losses	21,178	18,540
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	348	1,415
Less than 12 months, Unrealized Losses	3	6
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	348	1,415
Total, Unrealized Losses	3	6
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	17,795	144,307
Less than 12 months, Unrealized Losses	235	3,291
12 months or longer, Fair Value	226	885
12 months or longer, Unrealized Losses	1	5
Total, Fair Value	18,021	145,192
Total, Unrealized Losses	236	3,296
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	26,496	108,072
Less than 12 months, Unrealized Losses	51	502
12 months or longer, Fair Value	0	71,736
12 months or longer, Unrealized Losses	0	744
Total, Fair Value	26,496	179,808
Total, Unrealized Losses	51	1,246
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Losses	0	0
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	0	0
Total, Unrealized Losses	0	0
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	14,025	173,039
Less than 12 months, Unrealized Losses	99	2,676
12 months or longer, Fair Value	0	45,251
12 months or longer, Unrealized Losses	0	131
Total, Fair Value	14,025	218,290
Total, Unrealized Losses	99	2,807
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	11,202	135,174
Less than 12 months, Unrealized Losses	675	3,252
12 months or longer, Fair Value	254,882	140,965
12 months or longer, Unrealized Losses	14,897	4,999
Total, Fair Value	266,084	276,139
Total, Unrealized Losses	15,572	8,251
Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	2,703
Less than 12 months, Unrealized Losses	0	842
12 months or longer, Fair Value	4,347	2,000
12 months or longer, Unrealized Losses	1,702	500
Total, Fair Value	4,347	4,703
Total, Unrealized Losses	1,702	1,342
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Losses	0	0
12 months or longer, Fair Value	12,984	13,562
12 months or longer, Unrealized Losses	2,179	1,592
Total, Fair Value	12,984	13,562
Total, Unrealized Losses	2,179	1,592
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	96,038	0
Less than 12 months, Unrealized Losses	1,336	0
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	96,038	0
Total, Unrealized Losses	$ 1,336	$ 0

Investment Securities - Summa_3

Investment Securities - Summary of Gains or Losses on Proceeds from Maturities, Sales and Calls of Available for Sale Securities by Specific Identification Method (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales and calls	$ 280,780	$ 188,432	$ 413,706	$ 384,763
Gross realized gains	1,565	739	1,818	754
Gross realized losses	$ 98	$ 608	$ 177	$ 972

Investment Securities - Additio

Investment Securities - Additional Information (Detail) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020USD ($)Securities	Dec. 31, 2019USD ($)
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 21,178	$ 18,540
Available for sale securities in unrealized loss position | Securities	77
Available for sale securities in portfolio, number | Securities	982
Amortized cost of available for sale securities	$ 2,730,350	2,426,924
Capitalization of banks, equal to or greater than, in the single-issue trust preferred portfolio	10,000,000
Equity securities at estimated fair value	9,875	8,894
Carrying value of securities pledged	$ 2,150,574	1,540,717
Percentage Of Guarantee Repayment By Government	97.00%
Accrued interest receivable	$ 11,275	9,890
Below Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	11,492
Split Rated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	978
Unrated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	5,741
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	236	3,296
Amortized cost of available for sale securities	$ 502,293	272,014
Percent of portfolio with credit support	57.00%
Agency Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	$ 1,410,376
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	99	2,807
Amortized cost of available for sale securities	591,303	609,461
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	51	1,246
Amortized cost of available for sale securities	819,073	826,857
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	0	0
Amortized cost of available for sale securities	$ 61,954	3,429
Percentage of available for sale securities at amortized cost unrated	7.00%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings	$ 0
Residential Mortgage-Backed Securities, Non-agency [Member] | AAA [Member]
Schedule of Investments [Line Items]
Percentage of available for sale securities at amortized cost rated	93.00%
Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 1,702	1,342
Amortized cost of available for sale securities	11,895	6,045
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	1,336	0
Amortized cost of available for sale securities	$ 365,934	$ 348,405
Corporate Bonds [Member] | Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	88.00%
Corporate Bonds [Member] | Unrated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	12.00%

Investment Securities - Summa_4

Investment Securities - Summary of Maturities of Securities Available for Sale by Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 125,837	$ 92,422
Due after one year through five years, Amortized Cost	497,487	583,715
Due after five years through ten years, Amortized Cost	634,934	564,922
Due after ten years, Amortized Cost	1,472,092	1,185,865
Amortized Cost	2,730,350	2,426,924
Due in one year or less, Estimated Fair Value	127,307	92,473
Due after one year through five years, Estimated Fair Value	514,819	592,850
Due after five years through ten years, Estimated Fair Value	658,516	568,241
Due after ten years, Estimated Fair Value	1,499,299	1,183,732
Total available for sale securities	$ 2,799,941	$ 2,437,296

Investment Securities - Summa_5

Investment Securities - Summary of Equity Securities (Detail) - Marketable Equity Securities [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Net gains recognized during the period	$ 43	$ 55	$ 65	$ 244
Net gains recognized during the period on equity securities sold	1	2	7	134
Unrealized gains recognized during the period on equity securities still held at period end	43	64	114	122
Unrealized losses recognized during the period on equity securities still held at period end	$ (1)	$ (11)	$ (56)	$ (12)

Loans - Major Classes of Loans

Loans - Major Classes of Loans And Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Commercial, financial, and agricultural
Total commercial, financial & agricultural	$ 10,743,055	$ 7,452,649
Residential real estate	4,310,156	3,686,401
Construction & land development	1,775,728	1,408,205
Consumer:
Bankcard	8,465	10,074
Other consumer	1,195,150	1,156,219
Total Financing Receivables	18,032,554	13,713,548
Owner-Occupied Commercial Real Estate [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	1,624,760	1,201,652
Nonowner-Occupied Commercial Real Estate [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	5,004,790	3,965,960
Other Commercial Loans And Leases [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	$ 4,113,505	$ 2,285,037

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Loans held for sale	$ 625,984	$ 387,514
Other Commercial Loans [Member] | Carolina Financial [Member]
Business combination lease receivable acquired gross outstanding	$ 13,372
Other Commercial Loans [Member] | Carolina Financial [Member] | Maximum [Member]
Business combination lease receivable acquired lease term	60 months
Other Commercial Loans [Member] | Carolina Financial [Member] | Minimum [Member]
Business combination lease receivable acquired lease term	12 months
Directors and Officers [Member]
Related party loans	$ 35,816	$ 38,558

Credit Quality - Additional Inf

Credit Quality - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Minimum days for discontinue of accrual interest on commercial and consumer loan		90 days
Maximum days for discontinue of accrual interest on commercial and consumer loan		120 days
Troubled debt restructuring		$ 77,436	$ 58,369
Restructured loans on nonaccrual status	$ 59,916	$ 59,916	48,387
Minimum number of days required for special mention		30 days
Maximum number of days required for special mention		89 days
OREO	29,947	$ 29,947	15,515
Recorded investment of consumer mortgage loans	1,738	1,738	890
Troubled debt restructurings post modification additional funds recorded investment		$ 124
Description of Credit Risk Exposure		For United’s loans with a corporate credit exposure, United analyzes loans individually to classify the loans as to credit risk. Review and analysis of criticized (special mention-rated loans in the amount of $1,000 or greater) and classified (substandard-rated and worse in the amount of $500 and greater) loans is completed once per quarter. Review of notes with committed exposure of $2,000 or greater is completed at least annually.
Payments under funding commitments	38	$ 111
Loans Modification Explanation		As provided for under the CARES Act, these loan modifications are exempt by law from classification as a TDR as defined by GAAP, from the period beginning March 1, 2020 until the earlier of December 31, 2020 or the date that is 60 days after the date
Payment Deferral [Member] | Minimum [Member]
Loans Repayments Minimum Term		90 days
Loans Repayments Maximum Term		180 days
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Restructured loans on nonaccrual status	$ 544	$ 544	$ 902

Credit Quality - Schedule of Tr

Credit Quality - Schedule of Troubled Debt Restructurings, Segregated by Class of Loans (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)Contract	Jun. 30, 2019USD ($)Contract	Jun. 30, 2020USD ($)Contract	Jun. 30, 2019USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	69	7	79	9
Pre-Modification Outstanding Recorded Investment	$ 22,576	$ 4,796	$ 33,070	$ 5,474
Post-Modification Outstanding Recorded Investment	$ 22,389	$ 4,743	$ 32,393	$ 5,397
Construction & Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	9	3	12	3
Pre-Modification Outstanding Recorded Investment	$ 2,562	$ 2,242	$ 4,607	$ 2,242
Post-Modification Outstanding Recorded Investment	$ 2,557	$ 2,202	$ 4,570	$ 2,202
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	18	1	21	1
Pre-Modification Outstanding Recorded Investment	$ 10,628	$ 150	$ 18,579	$ 150
Post-Modification Outstanding Recorded Investment	$ 10,586	$ 150	$ 18,345	$ 150
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	6	0	6	0
Pre-Modification Outstanding Recorded Investment	$ 2,259	$ 0	$ 2,259	$ 0
Post-Modification Outstanding Recorded Investment	$ 2,248	$ 0	$ 2,248	$ 0
Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	14	1	18	2
Pre-Modification Outstanding Recorded Investment	$ 3,169	$ 559	$ 3,667	$ 824
Post-Modification Outstanding Recorded Investment	$ 3,090	$ 559	$ 3,322	$ 811
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	19	2	19	3
Pre-Modification Outstanding Recorded Investment	$ 3,889	$ 1,845	$ 3,889	$ 2,258
Post-Modification Outstanding Recorded Investment	$ 3,872	$ 1,832	$ 3,872	$ 2,234
Consumer [Member] | Bankcard [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	0	3	0
Pre-Modification Outstanding Recorded Investment	$ 69	$ 0	$ 69	$ 0
Post-Modification Outstanding Recorded Investment	$ 36	$ 0	$ 36	$ 0

Credit Quality - Schedule of Ch

Credit Quality - Schedule of Charged-off Troubled Debt Restructurings on Financing Receivables (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020USD ($)Contract	Jun. 30, 2020USD ($)Contract	Jun. 30, 2019USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	1	1
Recorded Investment | $	$ 690	$ 690	$ 1,321
Construction & Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	1	0
Recorded Investment | $	$ 690	$ 690	$ 0
Bankcard [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract			0
Recorded Investment | $			$ 0
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract			0
Recorded Investment | $			$ 0
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0
Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	1
Recorded Investment | $	$ 0	$ 0	$ 1,321
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0
Consumer [Member] | Bankcard [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0
Recorded Investment | $	$ 0	$ 0
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0
Recorded Investment | $	$ 0	$ 0

Credit Quality - Schedule of Re

Credit Quality - Schedule of Reasons For Modification Troubled Debt Restructuring Loans (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	$ 77,436	$ 58,369
Interest rate reduction [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	11,662	1,685
Interest rate reduction and change in terms [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	3,039	1,733
Forgiveness of principal [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	252	0
Transfer of asset [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	121	0
Concession of principal and term [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	24	0
Extended maturity [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	4,879	0
Change in terms [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	$ 57,459	$ 54,951

Credit Quality - Schedule of _2

Credit Quality - Schedule of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
Post-Modification Outstanding Recorded Investment	$ 22,389	$ 4,743	$ 32,393	$ 5,397
Interest rate reduction [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
Post-Modification Outstanding Recorded Investment	2,675	0	10,028	251
Interest rate reduction and change in terms [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
Post-Modification Outstanding Recorded Investment	1,326	0	1,326	0
Forgiveness of principal [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
Post-Modification Outstanding Recorded Investment	252	0	252	0
Transfer of asset [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
Post-Modification Outstanding Recorded Investment	121	0	121	0
Concession of principal and term [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
Post-Modification Outstanding Recorded Investment	24	0	24	0
Extended maturity [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
Post-Modification Outstanding Recorded Investment	4,879	0	4,879	0
Change in terms [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
Post-Modification Outstanding Recorded Investment	$ 13,112	$ 4,743	$ 15,763	$ 5,146

Credit Quality - Schedule of Ag

Credit Quality - Schedule of Age Analysis of its Past Due Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	$ 66,619	$ 65,816
Loans, Total Past Due	205,593	186,906
Loans, Current & Other	17,826,961	13,526,642
Total Financing Receivables	18,032,554	13,713,548
Loans, Recorded Investment >90 Days & Accruing	11,150	9,494
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	138,974	121,090
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	5,427	2,219
Loans, Total Past Due	12,315	18,262
Loans, Current & Other	1,763,413	1,389,943
Total Financing Receivables	1,775,728	1,408,205
Loans, Recorded Investment >90 Days & Accruing	84	0
Construction & Land Development [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	6,888	16,043
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	4,281	8,878
Loans, Total Past Due	37,480	20,087
Loans, Current & Other	1,587,280	1,181,565
Total Financing Receivables	1,624,760	1,201,652
Loans, Recorded Investment >90 Days & Accruing	1,419	544
Commercial Real Estate [Member] | Owner-Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	33,199	11,209
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	3,633	6,318
Loans, Total Past Due	26,998	22,447
Loans, Current & Other	4,977,792	3,943,513
Total Financing Receivables	5,004,790	3,965,960
Loans, Recorded Investment >90 Days & Accruing	859	471
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	23,365	16,129
Other Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	10,781	5,238
Loans, Total Past Due	54,237	56,779
Loans, Current & Other	4,059,268	2,228,258
Total Financing Receivables	4,113,505	2,285,037
Loans, Recorded Investment >90 Days & Accruing	777	668
Other Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	43,456	51,541
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	34,510	31,727
Loans, Total Past Due	64,393	56,070
Loans, Current & Other	4,245,763	3,630,331
Total Financing Receivables	4,310,156	3,686,401
Loans, Recorded Investment >90 Days & Accruing	6,234	6,256
Residential Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	29,883	24,343
Consumer [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	173	445
Loans, Total Past Due	333	663
Loans, Current & Other	8,132	9,411
Total Financing Receivables	8,465	10,074
Loans, Recorded Investment >90 Days & Accruing	160	218
Consumer [Member] | Bankcard [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	160	218
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	7,814	10,991
Loans, Total Past Due	9,837	12,598
Loans, Current & Other	1,185,313	1,143,621
Total Financing Receivables	1,195,150	1,156,219
Loans, Recorded Investment >90 Days & Accruing	1,617	1,337
Consumer [Member] | Other Consumer [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	$ 2,023	$ 1,607

Credit Quality - Schedule of _3

Credit Quality - Schedule of Age Analysis of its Past Due Loans, Segregated by Class of Loans (Parenthetical) (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	$ 13,713,548
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	96,004
Loans Acquired with Deteriorated Credit Quality [Member] | Loans and Debt Securities Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	$ 96,004

Credit Quality - Schedule of No

Credit Quality - Schedule of Nonaccrual Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	$ 127,824	$ 127,824	$ 111,596
With No Related Allowance for Credit Losses	94,701	94,701
Recorded Investment > 90 Days & Accruing	11,150	11,150	9,494
Interest Income Recognized	22	37
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	31,780	31,780	10,665
With No Related Allowance for Credit Losses	26,723	26,723
Recorded Investment > 90 Days & Accruing	1,419	1,419	544
Interest Income Recognized	17	32
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	22,506	22,506	15,658
With No Related Allowance for Credit Losses	19,882	19,882
Recorded Investment > 90 Days & Accruing	859	859	471
Interest Income Recognized	1	1
Other Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	42,679	42,679	50,873
With No Related Allowance for Credit Losses	18,909	18,909
Recorded Investment > 90 Days & Accruing	777	777	668
Interest Income Recognized	1	1
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	23,649	23,649	18,087
With No Related Allowance for Credit Losses	22,022	22,022
Recorded Investment > 90 Days & Accruing	6,234	6,234	6,256
Interest Income Recognized	3	3
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	6,804	6,804	16,043
With No Related Allowance for Credit Losses	6,759	6,759
Recorded Investment > 90 Days & Accruing	84	84
Interest Income Recognized	0	0
Consumer [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	0	0	0
With No Related Allowance for Credit Losses	0	0
Recorded Investment > 90 Days & Accruing	160	160	218
Interest Income Recognized	0	0
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	406	406	270
With No Related Allowance for Credit Losses	406	406
Recorded Investment > 90 Days & Accruing	1,617	1,617	$ 1,337
Interest Income Recognized	$ 0	$ 0

Credit Quality - Schedule of Am

Credit Quality - Schedule of Amortized Cost Loans Pledged As Collateral (Detail) $ in Thousands	Jun. 30, 2020USD ($)
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	$ 198,481
Commercial Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	53,793
Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	50,133
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	48,413
Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	25,588
Construction Loans [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	20,554
Consumer Portfolio Segment [Member] | Bankcard [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Consumer Portfolio Segment [Member] | Other Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	55,970
Residential Real Estate [Member] | Commercial Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	6,037
Residential Real Estate [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	2,084
Residential Real Estate [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	12,806
Residential Real Estate [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	25,104
Residential Real Estate [Member] | Construction Loans [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	9,939
Residential Real Estate [Member] | Consumer Portfolio Segment [Member] | Bankcard [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Residential Real Estate [Member] | Consumer Portfolio Segment [Member] | Other Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Business Assets Member [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	48,020
Business Assets Member [Member] | Commercial Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	47,707
Business Assets Member [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	84
Business Assets Member [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Business Assets Member [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	229
Business Assets Member [Member] | Construction Loans [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Business Assets Member [Member] | Consumer Portfolio Segment [Member] | Bankcard [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Business Assets Member [Member] | Consumer Portfolio Segment [Member] | Other Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Land [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	13,105
Land [Member] | Commercial Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Land [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Land [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	2,981
Land [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	255
Land [Member] | Construction Loans [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	9,869
Land [Member] | Consumer Portfolio Segment [Member] | Bankcard [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Land [Member] | Consumer Portfolio Segment [Member] | Other Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Commercial Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	34,796
Commercial Real Estate [Member] | Commercial Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Commercial Real Estate [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	19,246
Commercial Real Estate [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	15,550
Commercial Real Estate [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Commercial Real Estate [Member] | Construction Loans [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Commercial Real Estate [Member] | Consumer Portfolio Segment [Member] | Bankcard [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Commercial Real Estate [Member] | Consumer Portfolio Segment [Member] | Other Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Other Assets [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	46,590
Other Assets [Member] | Commercial Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	49
Other Assets [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	28,719
Other Assets [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	17,076
Other Assets [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Other Assets [Member] | Construction Loans [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	746
Other Assets [Member] | Consumer Portfolio Segment [Member] | Bankcard [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	0
Other Assets [Member] | Consumer Portfolio Segment [Member] | Other Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans Pledged As Collateral	$ 0

Credit Quality - Schedule of Ri

Credit Quality - Schedule of Risk Category of Loans by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 10,743,055	$ 7,452,649
Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	109,615
2019	164,394
2018	140,250
2017	247,544
2016	311,401
Prior	625,999
Revolving loans amortized cost basis	24,940
Revolving loans converted to term loans	617
Total	1,624,760	1,201,652
Owner-Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	107,784
2019	163,097
2018	133,255
2017	244,528
2016	304,759
Prior	565,627
Revolving loans amortized cost basis	23,576
Revolving loans converted to term loans	0
Total	1,542,626
Owner-Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	1,225
2018	6,995
2017	781
2016	2,100
Prior	9,634
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	468
Total	21,203
Owner-Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	1,831
2019	72
2018	0
2017	2,235
2016	4,542
Prior	50,394
Revolving loans amortized cost basis	1,364
Revolving loans converted to term loans	149
Total	60,587
Owner-Occupied [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	344
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	344
Owner-Occupied [Member] | YTD Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	(535)
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	(535)
Owner-Occupied [Member] | YTD Recoveries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	310
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	310
Owner-Occupied [Member] | YTD Net Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	(225)
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	(225)
Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	297,547
2019	750,208
2018	693,846
2017	623,207
2016	606,699
Prior	1,915,793
Revolving loans amortized cost basis	115,345
Revolving loans converted to term loans	2,145
Total	5,004,790	$ 3,965,960
Nonowner-Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	297,474
2019	748,897
2018	685,228
2017	620,528
2016	582,809
Prior	1,844,405
Revolving loans amortized cost basis	115,345
Revolving loans converted to term loans	2,145
Total	4,896,831
Nonowner-Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	347
2018	0
2017	977
2016	10,645
Prior	27,024
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	38,993
Nonowner-Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	73
2019	964
2018	8,618
2017	1,702
2016	13,245
Prior	44,364
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	68,966
Nonowner-Occupied [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	0
Nonowner-Occupied [Member] | YTD Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	(690)
Prior	(1,247)
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	(1,937)
Nonowner-Occupied [Member] | YTD Recoveries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	722
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	722
Nonowner-Occupied [Member] | YTD Net Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	(690)
Prior	(525)
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	(1,215)
Other Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	1,509,343
2019	452,782
2018	215,946
2017	155,166
2016	161,977
Prior	380,052
Revolving loans amortized cost basis	1,234,341
Revolving loans converted to term loans	3,898
Total	4,113,505
Other Commercial Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	1,509,244
2019	451,574
2018	212,881
2017	150,587
2016	150,389
Prior	311,422
Revolving loans amortized cost basis	1,213,494
Revolving loans converted to term loans	3,071
Total	4,002,662
Other Commercial Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	99
2019	313
2018	430
2017	2,044
2016	202
Prior	20,072
Revolving loans amortized cost basis	4,053
Revolving loans converted to term loans	423
Total	27,636
Other Commercial Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	895
2018	2,635
2017	2,535
2016	11,386
Prior	48,486
Revolving loans amortized cost basis	16,794
Revolving loans converted to term loans	404
Total	83,135
Other Commercial Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	72
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	72
Other Commercial Loans [Member] | YTD Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	(11)
2018	(964)
2017	(365)
2016	(6)
Prior	(5,682)
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	(7,028)
Other Commercial Loans [Member] | YTD Recoveries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	42
2018	16
2017	3
2016	21
Prior	332
Revolving loans amortized cost basis	32
Revolving loans converted to term loans	0
Total	446
Other Commercial Loans [Member] | YTD Net Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	31
2018	(948)
2017	(362)
2016	15
Prior	(5,350)
Revolving loans amortized cost basis	32
Revolving loans converted to term loans	0
Total	(6,582)
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	324,682
2019	750,541
2018	857,528
2017	397,056
2016	355,463
Prior	1,142,871
Revolving loans amortized cost basis	477,449
Revolving loans converted to term loans	4,566
Total	4,310,156
Residential Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	324,682
2019	750,044
2018	857,069
2017	393,030
2016	347,781
Prior	1,111,476
Revolving loans amortized cost basis	476,577
Revolving loans converted to term loans	4,332
Total	4,264,991
Residential Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	271
2018	0
2017	226
2016	2,349
Prior	7,014
Revolving loans amortized cost basis	435
Revolving loans converted to term loans	0
Total	10,295
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	226
2018	459
2017	3,800
2016	5,333
Prior	24,252
Revolving loans amortized cost basis	437
Revolving loans converted to term loans	234
Total	34,741
Residential Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	129
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	129
Residential Portfolio Segment [Member] | YTD Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	(1)
Prior	(889)
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	(890)
Residential Portfolio Segment [Member] | YTD Recoveries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	101
2016	0
Prior	201
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	302
Residential Portfolio Segment [Member] | YTD Net Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	101
2016	(1)
Prior	(688)
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	(588)
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	163,253
2019	707,077
2018	378,084
2017	173,294
2016	134,240
Prior	93,590
Revolving loans amortized cost basis	126,045
Revolving loans converted to term loans	143
Total	1,775,728
Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	163,253
2019	706,921
2018	375,025
2017	173,269
2016	133,679
Prior	70,466
Revolving loans amortized cost basis	102,752
Revolving loans converted to term loans	143
Total	1,725,510
Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	1,506
2017	0
2016	561
Prior	2,681
Revolving loans amortized cost basis	995
Revolving loans converted to term loans	0
Total	5,743
Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	156
2018	1,553
2017	25
2016	0
Prior	20,443
Revolving loans amortized cost basis	22,298
Revolving loans converted to term loans	0
Total	44,475
Construction Loans [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	0
Construction Loans [Member] | YTD Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	(1,969)
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	(1,969)
Construction Loans [Member] | YTD Recoveries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	1,361
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	1,361
Construction Loans [Member] | YTD Net Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	(608)
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	(608)
Bankcard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	8,465
Total	8,465
Bankcard [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	8,133
Total	8,133
Bankcard [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	172
Total	172
Bankcard [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	160
Total	160
Bankcard [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	0
Bankcard [Member] | YTD Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	(128)
Total	(128)
Bankcard [Member] | YTD Recoveries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	12
Total	12
Bankcard [Member] | YTD Net Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	(116)
Total	(116)
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	220,927
2019	494,700
2018	298,471
2017	104,779
2016	54,766
Prior	14,408
Revolving loans amortized cost basis	7,099
Revolving loans converted to term loans	0
Total	1,195,150
Other Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	220,924
2019	494,700
2018	298,460
2017	104,779
2016	54,766
Prior	14,247
Revolving loans amortized cost basis	7,095
Revolving loans converted to term loans	0
Total	1,194,971
Other Consumer [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	11
2017	0
2016	0
Prior	152
Revolving loans amortized cost basis	4
Revolving loans converted to term loans	0
Total	167
Other Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	3
2019	0
2018	0
2017	0
2016	0
Prior	9
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	12
Other Consumer [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	0
2018	0
2017	0
2016	0
Prior	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	0
Other Consumer [Member] | YTD Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	(16)
2019	(589)
2018	(652)
2017	(272)
2016	(152)
Prior	(225)
Revolving loans amortized cost basis	(2)
Revolving loans converted to term loans	0
Total	(1,908)
Other Consumer [Member] | YTD Recoveries [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	0
2019	24
2018	33
2017	11
2016	18
Prior	124
Revolving loans amortized cost basis	0
Revolving loans converted to term loans	0
Total	210
Other Consumer [Member] | YTD Net Charge Offs [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
2020	(16)
2019	(565)
2018	(619)
2017	(261)
2016	(134)
Prior	(101)
Revolving loans amortized cost basis	(2)
Revolving loans converted to term loans	0
Total	$ (1,698)

Credit Quality - Schedule of Cr

Credit Quality - Schedule of Credit Quality Indicators Information, by Class of Loans (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	$ 13,713,548
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	3,686,401
Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,285,037
Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	10,074
Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,156,219
Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,201,652
Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	3,965,960
Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,408,205
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	3,645,654
Pass [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,136,266
Pass [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	9,411
Pass [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,143,608
Pass [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,136,589
Pass [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	3,850,886
Pass [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,334,950
Special Mention [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	12,038
Special Mention [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	75,511
Special Mention [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	445
Special Mention [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	10,993
Special Mention [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	14,449
Special Mention [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	44,134
Special Mention [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	4,614
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	28,572
Substandard [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	72,451
Substandard [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	218
Substandard [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,618
Substandard [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	50,346
Substandard [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	70,940
Substandard [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	68,641
Doubtful [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	137
Doubtful [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	809
Doubtful [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0
Doubtful [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0
Doubtful [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	268
Doubtful [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0
Doubtful [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	$ 0

Allowance for Credit Losses - A

Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Reserve for lending-related commitments	$ 11,946	$ 1,733
Maximum Period Related To Accrual Of Interest On Discontinued Loans	90 days
Accrued interest receivable	$ 56,124	$ 48,130

Allowance for Credit Losses - S

Allowance for Credit Losses - Schedule Of Credit Losses Related To Accrued Interest Receivables and Written Off (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	$ 56,124,000	$ 56,124,000	$ 48,130,000
Accrued Interest Receivables Written Off by Reversing Interest Income	245	391
Construction [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	6,825,000	6,825,000
Accrued Interest Receivables Written Off by Reversing Interest Income	0	0
Commercial Real Estate [Member] | Owner-Occupied [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	4,910,000	4,910,000
Accrued Interest Receivables Written Off by Reversing Interest Income	83	100
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	18,107,000	18,107,000
Accrued Interest Receivables Written Off by Reversing Interest Income	38	45
Other Commercial [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	9,350,000	9,350,000
Accrued Interest Receivables Written Off by Reversing Interest Income	33	45
Residential Real Estate [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	14,085,000	14,085,000
Accrued Interest Receivables Written Off by Reversing Interest Income	64	134
Consumer [Member] | Bankcard [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	0	0
Accrued Interest Receivables Written Off by Reversing Interest Income	0	0
Consumer [Member] | Other Consumer [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	2,847,000	2,847,000
Accrued Interest Receivables Written Off by Reversing Interest Income	$ 27	$ 67

Allowance for Credit Losses -_2

Allowance for Credit Losses - Schedule of Allowance for Loan Losses and Carrying Amount of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	$ 154,923	$ 77,057	$ 76,703
Initial allowance for PCD loans (acquired during the period)	18,635	18,635
Charge-offs	(5,634)	(14,395)	(29,110)
Recoveries	1,290	3,363	8,151
Provision	45,907	73,019	21,313
Allowance for Loan Losses Ending balance	215,121	215,121	77,057
Allowance for Loan Losses, individually evaluated for impairment			16,499
Allowance for Loan Losses, collectively evaluated for impairment			60,558
Financing receivables			13,713,548
Financing receivables, individually evaluated for impairment			123,505
Financing receivables, collectively evaluated for impairment			13,494,039
Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		52,321
Allowance for Loan Losses Ending balance			52,321
Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		5,121
Allowance for Loan Losses Ending balance			5,121
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses			0
Financing receivables			96,004
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	18,792	3,353	7,992
Initial allowance for PCD loans (acquired during the period)	2,570	2,570
Charge-offs	(225)	(1,969)	(1,303)
Recoveries	517	1,361	175
Provision	10,649	10,126	(3,511)
Allowance for Loan Losses Ending balance	32,303	32,303	3,353
Allowance for Loan Losses, individually evaluated for impairment			262
Allowance for Loan Losses, collectively evaluated for impairment			3,091
Financing receivables			1,408,205
Financing receivables, individually evaluated for impairment			14,047
Financing receivables, collectively evaluated for impairment			1,382,369
Construction & Land Development [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		14,817
Allowance for Loan Losses Ending balance			14,817
Construction & Land Development [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		2,045
Allowance for Loan Losses Ending balance			2,045
Construction & Land Development [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses			0
Financing receivables			11,789
Bankcard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	226	74
Initial allowance for PCD loans (acquired during the period)	0	0
Charge-offs	(82)	(128)
Recoveries	6	12
Provision	130	294
Allowance for Loan Losses Ending balance	280	280	74
Financing receivables			10,074
Bankcard [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		28
Allowance for Loan Losses Ending balance			28
Bankcard [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		0
Allowance for Loan Losses Ending balance			0
Allowance for Estimated Imprecision [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	0	297	245
Initial allowance for PCD loans (acquired during the period)	0	0
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	0	0	52
Allowance for Loan Losses Ending balance	0	0	297
Allowance for Loan Losses, individually evaluated for impairment			0
Allowance for Loan Losses, collectively evaluated for impairment			297
Financing receivables			0
Financing receivables, individually evaluated for impairment			0
Financing receivables, collectively evaluated for impairment			0
Allowance for Estimated Imprecision [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		(297)
Allowance for Loan Losses Ending balance			(297)
Allowance for Estimated Imprecision [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		0
Allowance for Loan Losses Ending balance			0
Allowance for Estimated Imprecision [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses			0
Financing receivables			0
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	19,495	5,554	5,063
Initial allowance for PCD loans (acquired during the period)	1,955	1,955
Charge-offs	(356)	(535)	(7,905)
Recoveries	244	310	3,733
Provision	1,400	3,874	4,663
Allowance for Loan Losses Ending balance	22,738	22,738	5,554
Allowance for Loan Losses, individually evaluated for impairment			973
Allowance for Loan Losses, collectively evaluated for impairment			4,581
Financing receivables			1,201,652
Financing receivables, individually evaluated for impairment			16,703
Financing receivables, collectively evaluated for impairment			1,160,556
Commercial Real Estate [Member] | Owner-Occupied [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		9,737
Allowance for Loan Losses Ending balance			9,737
Commercial Real Estate [Member] | Owner-Occupied [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		1,843
Allowance for Loan Losses Ending balance			1,843
Commercial Real Estate [Member] | Owner-Occupied [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses			0
Financing receivables			24,393
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	17,569	8,524	6,919
Initial allowance for PCD loans (acquired during the period)	6,418	6,418
Charge-offs	(1,937)	(1,937)	(1,093)
Recoveries	137	722	80
Provision	3,590	2,906	2,618
Allowance for Loan Losses Ending balance	25,777	25,777	8,524
Allowance for Loan Losses, individually evaluated for impairment			2,979
Allowance for Loan Losses, collectively evaluated for impairment			5,545
Financing receivables			3,965,960
Financing receivables, individually evaluated for impairment			27,121
Financing receivables, collectively evaluated for impairment			3,925,249
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		9,023
Allowance for Loan Losses Ending balance			9,023
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		121
Allowance for Loan Losses Ending balance			121
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses			0
Financing receivables			13,590
Other Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	53,827	47,325	41,341
Initial allowance for PCD loans (acquired during the period)	7,032	7,032
Charge-offs	(1,340)	(7,028)	(12,975)
Recoveries	131	446	2,599
Provision	19,754	35,520	16,360
Allowance for Loan Losses Ending balance	79,404	79,404	47,325
Allowance for Loan Losses, individually evaluated for impairment			11,931
Allowance for Loan Losses, collectively evaluated for impairment			35,394
Financing receivables			2,285,037
Financing receivables, individually evaluated for impairment			54,108
Financing receivables, collectively evaluated for impairment			2,194,432
Other Commercial [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		(4,829)
Allowance for Loan Losses Ending balance			(4,829)
Other Commercial [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		938
Allowance for Loan Losses Ending balance			938
Other Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses			0
Financing receivables			36,497
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	30,624	8,997	12,448
Initial allowance for PCD loans (acquired during the period)	652	652
Charge-offs	(523)	(890)	(2,967)
Recoveries	160	302	858
Provision	7,970	16,551	(1,342)
Allowance for Loan Losses Ending balance	38,883	38,883	8,997
Allowance for Loan Losses, individually evaluated for impairment			354
Allowance for Loan Losses, collectively evaluated for impairment			8,643
Financing receivables			3,686,401
Financing receivables, individually evaluated for impairment			11,526
Financing receivables, collectively evaluated for impairment			3,665,140
Residential Real Estate [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		13,097
Allowance for Loan Losses Ending balance			13,097
Residential Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		174
Allowance for Loan Losses Ending balance			174
Residential Real Estate [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses			0
Financing receivables			9,735
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		3,007	2,695
Charge-offs			(2,867)
Recoveries			706
Provision			2,473
Allowance for Loan Losses Ending balance			3,007
Allowance for Loan Losses, individually evaluated for impairment			0
Allowance for Loan Losses, collectively evaluated for impairment			3,007
Financing receivables			1,166,293
Financing receivables, individually evaluated for impairment			0
Financing receivables, collectively evaluated for impairment			1,166,293
Consumer [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses			0
Financing receivables			0
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	14,390	2,933
Initial allowance for PCD loans (acquired during the period)	8	8
Charge-offs	(1,171)	(1,908)
Recoveries	95	210
Provision	2,414	3,748
Allowance for Loan Losses Ending balance	$ 15,736	15,736	2,933
Other Consumer [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		10,745
Allowance for Loan Losses Ending balance			10,745
Other Consumer [Member] | Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance		$ 0
Allowance for Loan Losses Ending balance			$ 0

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,450
Goodwill not subject to amortization	1,794,779	$ 1,478,014
Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,396	98,359
Accumulated Amortization	(72,738)	(69,508)
George Mason Trade Name Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,080	1,080
Crescent Mortgage Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,370
Community Banking [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0
Goodwill not subject to amortization	1,789,464	1,472,699
Community Banking [Member] | Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,396	98,359
Accumulated Amortization	(72,738)	(69,508)
Community Banking [Member] | George Mason Trade Name Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	0
Community Banking [Member] | Crescent Mortgage Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0
Mortgage Banking [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,450
Goodwill not subject to amortization	5,315	5,315
Mortgage Banking [Member] | Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	0
Accumulated Amortization	0	0
Mortgage Banking [Member] | George Mason Trade Name Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,080	$ 1,080
Mortgage Banking [Member] | Crescent Mortgage Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,370

Intangible Assets - Reconciliat

Intangible Assets - Reconciliation of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
Goodwill [Line Items]
Goodwill at December 31, 2019	$ 1,478,014
Preliminary addition to goodwill from Carolina Financial acquisition	316,765
Goodwill at june 30, 2020	1,794,779
Community Banking [Member]
Goodwill [Line Items]
Goodwill at December 31, 2019	1,472,699
Preliminary addition to goodwill from Carolina Financial acquisition	316,765
Goodwill at june 30, 2020	1,789,464
Mortgage Banking [Member]
Goodwill [Line Items]
Goodwill at December 31, 2019	5,315
Preliminary addition to goodwill from Carolina Financial acquisition	0
Goodwill at june 30, 2020	$ 5,315

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Amortization Expense On Intangible Assets	$ 1,646	$ 1,754	$ 3,223	$ 3,508

Intangible Assets - Schedule of

Intangible Assets - Schedule of Anticipated Amortization Expense (Detail) $ in Thousands	Dec. 31, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 6,612
2021	5,780
2022	4,939
2023	4,641
2024 and thereafter	$ 9,916

Mortage Servicing Rights - Addi

Mortage Servicing Rights - Additional Information (Detail) $ in Thousands	2 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2020USD ($)
Servicing Assets at Fair Value [Line Items]
Temporary impairment charge of mortgage servicing rights	$ (710)	$ (710)	$ (710)
Mortgage servicing rights			20,123
Mortgage Servicing Rights [Member]
Servicing Assets at Fair Value [Line Items]
Loans serviced for others unpaid principal balance	$ 3,552,292	$ 3,552,292	$ 3,552,292
Net servicing fee percentage	0.26%	0.26%	0.26%
Temporary impairment charge of mortgage servicing rights			$ (710)
Mortgage servicing rights		$ 20,123	$ 20,123
Mortgage Servicing Rights [Member] | Minimum [Member]
Servicing Assets at Fair Value [Line Items]
Discount rate used in estimating the fair value of servicing rights			10.50%
Weighted average prepayment rates used in estimating the fair value of servicing rights			10.63%
Deliquency rate used in determning fair value of servicing rights			7.08%
Mortgage Servicing Rights [Member] | Maximum [Member]
Servicing Assets at Fair Value [Line Items]
Discount rate used in estimating the fair value of servicing rights			12.91%
Weighted average prepayment rates used in estimating the fair value of servicing rights			14.40%
Deliquency rate used in determning fair value of servicing rights			15.66%
Mortgage Servicing Rights [Member] | Weighted Average [Member]
Servicing Assets at Fair Value [Line Items]
Deliquency rate used in determning fair value of servicing rights			3.78%
Mortgage Servicing Rights [Member] | Loan Origination Commitments [Member] | Median [Member]
Servicing Assets at Fair Value [Line Items]
Estimated fair value of mortgage servicing rights	$ 20,200	$ 20,200	$ 20,200

Mortage Servicing Rights - Summ

Mortage Servicing Rights - Summary of Activity in Mortgage Servicing Rights (Detail) $ in Thousands	2 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2020USD ($)
Servicing Asset at Amortized Cost [Line Items]
Addition from acquisition of subsidiary			$ 20,123
MSRs valuation allowance beginning balance		$ 0	0
MSRs impairment	$ (710)	(710)	(710)
MSRs valuation allowance ending balance	(710)	(710)	(710)
MSRs, net of valuation allowance	20,200	20,200	20,200
Mortgage Servicing Rights [Member]
Servicing Asset at Amortized Cost [Line Items]
MSRs beginning balance		0	0
Addition from acquisition of subsidiary		20,123	20,123
Amount capitalized		1,891	1,891
Purchased servicing		0	0
Amount amortized		(1,104)	(1,104)
MSRs ending balance	$ 20,910	$ 20,910	20,910
MSRs impairment			$ (710)

Leases - Additional Information

Leases - Additional Information (Detail)	Jun. 30, 2020
Operating leases, option to extend term	5 years
Maximum [Member]
Operating lease remaining lease term	13 years
Minimum [Member]
Operating lease remaining lease term	1 year

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating lease cost	$ 5,895	$ 4,886	$ 10,961	$ 9,707
Sublease income	(189)	(197)	(394)	(473)
Net lease cost	$ 5,706	$ 4,689	$ 10,567	$ 9,234

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Operating lease right-of-use assets	$ 70,655	$ 57,783
Operating lease liabilities	$ 74,435	$ 61,342

Leases - Other Information Rela

Leases - Other Information Related to Leases (Detail)	Jun. 30, 2020
Weightedaverage remaining lease term [Abstract]
Operating leases	5 years 6 months
Weightedaverage discount rate [Abstract]
Operating leases	2.68%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash paid for amounts in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases	$ 5,722	$ 4,931	$ 10,739	$ 9,649
ROU assets obtained in the exchange for lease liabilities	$ 8,549	$ 4,214	$ 12,332	$ 4,416

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities by Year (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
2020	$ 10,670	$ 17,725
2021	18,884	15,180
2022	14,782	11,522
2023	11,412	8,751
2024	7,264	5,127
Thereafter	16,909	8,190
Total lease payments	79,921	66,495
Less: imputed interest	(5,486)	(5,153)
Total	$ 74,435	$ 61,342

Short-Term Borrowings - Additio

Short-Term Borrowings - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2020USD ($)
Short-term Debt [Line Items]
Unused lines of credit	$ 230,000
Federal funds purchased	0
Repurchase agreements	176,168
Unrelated Financial Institution [Member]
Short-term Debt [Line Items]
Unused lines of credit	$ 20,000
Renewal period of line of credit	360-day
Amount of outstanding balance under line of credit	$ 0

Long-Term Borrowings - Addition

Long-Term Borrowings - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Unused borrowing amount	$ 4,278,441
Outstanding balances of debentures	$ 279,012	$ 236,164
Maximum time to defer payment of interest on subordinate debt	5 years
Advances from Federal Home Loan Banks	$ 1,354,879,000	$ 1,851,865,000
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year	1.59%
Advances From Federal Home Loan Banks Maximum Maturity Period	5 years

Long -Term Borrowings - Schedul

Long -Term Borrowings - Schedule of Maturities of Long-term Borrowings (Detail) $ in Thousands	Jun. 30, 2020USD ($)
Debt Disclosure [Abstract]
2020	$ 495,170
2021	827,724
2022	20,989
2023	0
2024 and thereafter	10,996
Total	$ 1,354,879

Commitments and Contingent Li_2

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Loan commitments outstanding	$ 5,302,560	$ 3,610,777
Loan commitments expiry period	1 year
George Mason [Member]
Loss Contingencies [Line Items]
Reserve for possible losses due to the repurchase of loans previously sold to investors	$ 1,330
Commitments to Extend Credit [Member] | George Mason [Member] | Short-term Contract with Customer [Member]
Loss Contingencies [Line Items]
Additional commitments to extend credit	498,512
Commercial Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	5,092	5,092
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	$ 147,940	$ 145,105

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Derivative liabilities notional amount	$ 515,725	$ 356,243
Federal Home Loan Bank Borrowings [Member] | Interest Rate Cash Flow Hedge [Member]
Derivative [Line Items]
Derivative liabilities notional amount	$ 250,000
Derivative instrument pay fixed rate of interest and receive floating rate	0.59%
Derivative instrument term of the interest rate swap	10 years
Cash flow hedge reclassification amount to be reclassified from aoci to income in the next twelve months	$ 1,095
Fair value of interest rate swaps liability net	$ 0

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Notional Amount and Fair Value Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Asset derivatives, notional amount	$ 952,357	$ 144,512
Liability derivatives, notional amount	515,725	356,243
Asset derivatives not designated as hedging instruments	29,578	4,527
Liability derivatives designated as hedging instruments	10,083	2,394
Liability derivatives not designated as hedging instruments	14,307	3,065
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability derivatives, notional amount	329,225	82,243
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	952,357	144,512
Liability derivatives, notional amount	186,500	274,000
Liability derivatives not designated as hedging instruments	4,224	671
Fair Value Hedging [Member]
Derivative [Line Items]
Liability derivatives designated as hedging instruments	8,424	2,394
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability derivatives, notional amount	79,225	82,243
Cash Flow Hedging [Member]
Derivative [Line Items]
Liability derivatives designated as hedging instruments	1,659	0
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability derivatives, notional amount	250,000	0
Other Assets [Member]
Derivative [Line Items]
Asset derivatives not designated as hedging instruments	1,745	9
Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Asset derivatives not designated as hedging instruments	27,833	4,518
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Asset derivatives, notional amount	878,925	117,252
Other Liabilities [Member] | TBA Mortgage Backed Securities [Member]
Derivative [Line Items]
Liability derivatives not designated as hedging instruments	4,224	671
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] | TBA Mortgage Backed Securities [Member]
Derivative [Line Items]
Liability derivatives, notional amount	186,500	274,000
Interest Rate Contracts [Member] | Other Liabilities [Member] | Fair Value Hedging [Member] | Hedged Commercial Loans [Member]
Derivative [Line Items]
Liability derivatives designated as hedging instruments	8,424	2,394
Interest Rate Contracts [Member] | Other Liabilities [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Hedged Commercial Loans [Member]
Derivative [Line Items]
Liability derivatives, notional amount	79,225	82,243
Interest Rate Contracts [Member] | Other Liabilities [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Hedged Commercial Loans Federal Home Loan Bank [Member]
Derivative [Line Items]
Liability derivatives, notional amount	250,000	0
Liability derivatives designated as hedging instruments	1,659	0
Forward Loan Sale Commitments [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	$ 73,432	$ 27,260

Derivative Financial Instrume_5

Derivative Financial Instruments - Summary of Carrying Amount Hedged Assets/(Liabilities) (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - Loans Net Of Unearned Income [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Carrying Amount of the Hedged Assets/(Liabilities)	$ 80,048	$ 81,397
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	(8,424)	(2,394)
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets/(Liabilities) for which Hedge Accounting has been Discontinued	$ 0	$ 0

Derivative Financial Instrume_6

Derivative Financial Instruments - Schedule of Derivative Financial Instruments on Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Derivatives in hedging relationships	$ 14,847	$ 3,295	$ 9,885	$ 6,170
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivatives in hedging relationships	(277)	(68)	(720)	(98)
Designated as Hedging Instrument [Member] | Interest And Fees On Loans [Member] | Interest Rate Contracts [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivatives in hedging relationships	(277)	(68)	(720)	(98)
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivatives not designated as hedging instruments	15,124	3,363	10,605	6,268
Not Designated as Hedging Instrument [Member] | Income from Mortgage Banking Activities [Member] | TBA Mortgage Backed Securities [Member]
Derivative [Line Items]
Derivatives not designated as hedging instruments	17,204	(962)	(1,771)	(474)
Not Designated as Hedging Instrument [Member] | Income from Mortgage Banking Activities [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivatives not designated as hedging instruments	(1,527)	3,833	12,169	5,870
Not Designated as Hedging Instrument [Member] | Income from Mortgage Banking Activities [Member] | Forward Loan Sale Commitments [Member]
Derivative [Line Items]
Derivatives not designated as hedging instruments	$ (553)	$ 492	$ 207	$ 872

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	2 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers from Level 1 to Level 3 for financial assets	$ 0	$ 0	$ 0	$ 0
Transfers from Level 3 to Level 1 for financial assets	0	0	0	0
Transfers from Level 2 to Level 3 for financial assets	0	0	0	0
Transfers from Level 3 to Level 2 for financial assets	0	0	0	0
Transfers from Level 1 to Level 3 for financial liabilities	0	0	0	0
Transfers from Level 3 to Level 1 for financial liabilities	0	0	0	0
Transfers from Level 2 to Level 3 for financial liabilities	0	0	0	0
Transfers from Level 3 to Level 2 for financial liabilities	0	0	0	$ 0
Nonrecurring fair value adjustments on loans held for sale		0
Temporary impairment charge of mortgage servicing rights	$ (710,000)	$ (710,000)	(710,000)
Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Temporary impairment charge of mortgage servicing rights			$ (710,000)
Net Servicing Fee Percentage Servicing Assets	0.26%	0.26%	0.26%
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Servicing Fee Percentage Servicing Assets	0.26%	0.26%	0.26%
Minimum [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate used in estimating the fair value of servicing rights			10.50%
Average range of constant prepayment rates			10.63%
Deliquency rate used in determning fair value of servicing rights			7.08%
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate used in estimating the fair value of servicing rights			10.50%
Average range of constant prepayment rates			7.08%
Maximum [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate used in estimating the fair value of servicing rights			12.91%
Average range of constant prepayment rates			14.40%
Deliquency rate used in determning fair value of servicing rights			15.66%
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate used in estimating the fair value of servicing rights			12.91%
Average range of constant prepayment rates			15.66%
Weighted Average [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deliquency rate used in determning fair value of servicing rights			3.78%
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate used in estimating the fair value of servicing rights			10.63%
Average range of constant prepayment rates			14.40%
Deliquency rate used in determning fair value of servicing rights			3.78%
Loans Held For Sale [Member] | Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sales price of loans held for sale increase percentage	0.12%	0.12%	0.12%
Loans Held For Sale [Member] | Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sales price of loans held for sale increase percentage	0.52%	0.52%	0.52%
Loans Held For Sale [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sales price of loans held for sale increase percentage	0.29%	0.29%	0.29%
Derivatives [Member] | Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sales price of loans held for sale increase percentage	0.12%	0.12%	0.12%
Derivatives [Member] | Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sales price of loans held for sale increase percentage	0.52%	0.52%	0.52%
Derivatives [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sales price of loans held for sale increase percentage	0.29%	0.29%	0.29%

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale		$ 625,984	$ 387,514
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		2,799,941	2,437,296
Available for sale equity securities		9,875	8,894
Loans held for sale		611,277	384,375
Derivative financial assets		29,578	4,527
Derivative financial liabilities		14,307	3,065
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		67,303	58,676
State and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		520,880	272,362
Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		848,231	836,534
Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		62,965	3,833
Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		622,785	614,973
Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		277,721	276,139
Trust Preferred Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		12,837	4,703
Single Issue Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		16,191	16,774
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		371,028	353,302
Financial Services Industry [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		103	154
Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		5,989	4,769
Forward Sales Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		1,745	4,518
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		27,833
TBA Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities		4,224	671
Derivative financial liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities			2,394
Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets			9
Derivative financial liabilities		10,083
Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	[1]	3,783	3,971
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale		0	0
Derivative financial assets		0	0
Derivative financial liabilities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		6,432	6,586
Available for sale equity securities		9,875	8,894
Loans held for sale		0	0
Derivative financial assets		0	0
Derivative financial liabilities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Trust Preferred Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		6,432	6,586
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Financial Services Industry [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		103	154
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		5,989	4,769
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Forward Sales Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | TBA Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Derivative financial liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities			0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets			0
Derivative financial liabilities		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	[1]	3,783	3,971
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale		60,187	3,139
Derivative financial assets		9,158	9
Derivative financial liabilities		14,307	3,065
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		2,780,672	2,426,007
Available for sale equity securities		0	0
Loans held for sale		45,480	0
Derivative financial assets		9,158	9
Derivative financial liabilities		14,307	3,065
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		67,303	58,676
Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		520,880	272,362
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		848,231	836,534
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		62,965	3,833
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		622,785	614,973
Significant Other Observable Inputs (Level 2) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		277,721	276,139
Significant Other Observable Inputs (Level 2) [Member] | Trust Preferred Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Other Observable Inputs (Level 2) [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		16,191	16,774
Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		364,596	346,716
Significant Other Observable Inputs (Level 2) [Member] | Financial Services Industry [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		0	0
Significant Other Observable Inputs (Level 2) [Member] | Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		0	0
Significant Other Observable Inputs (Level 2) [Member] | Forward Sales Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		1,745	0
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		7,413
Significant Other Observable Inputs (Level 2) [Member] | TBA Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities		4,224	671
Significant Other Observable Inputs (Level 2) [Member] | Derivative financial liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities			2,394
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets			9
Derivative financial liabilities		10,083
Significant Other Observable Inputs (Level 2) [Member] | Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	[1]	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale		565,797	384,375
Derivative financial assets		20,420	4,518
Derivative financial liabilities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		12,837	4,703
Available for sale equity securities		0	0
Loans held for sale		565,797	384,375
Derivative financial assets		20,420	4,518
Derivative financial liabilities		0	0
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | State and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Trust Preferred Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		12,837	4,703
Significant Unobservable Inputs (Level 3) [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Financial Services Industry [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Forward Sales Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		0	4,518
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		20,420
Significant Unobservable Inputs (Level 3) [Member] | TBA Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Derivative financial liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities			0
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets			0
Derivative financial liabilities		0
Significant Unobservable Inputs (Level 3) [Member] | Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	[1]	$ 0	$ 0
[1]	The equity mutual funds are within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries.

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Additional Information about Financial Assets and Liabilities Measured at Fair Value Utilized Level 3 (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	$ 4,703	$ 5,917
Included in earnings (or changes in net assets)	0	(155)
Included in other comprehensive income	2,318	(1,059)
Acquired in Carolina Financial merger	5,816	0
Balance, end of period	12,837	4,703
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	0	0
Loans Held For Sale [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	384,375	247,104
Included in earnings (or changes in net assets)	78,712	83,806
Originations	2,363,759	2,941,722
Sales	(2,261,049)	(2,888,257)
Balance, end of period	565,797	384,375
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	0	0
Interest Rate Lock Commitments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	4,518	4,103
Transfers other	15,902	415
Balance, end of period	20,420	4,518
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	$ 0	$ 0

Fair Value Measurements - Sch_3

Fair Value Measurements - Schedule of Changes in Fair Value Included in Earnings of Financial Instruments for which Fair Value Option has been Elected (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Mortgage Banking [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Income from mortgage banking activities	$ 8,846	$ 4,578	$ 10,471	$ 6,542

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Difference Between Aggregate Fair Value and Remaining Contractual Principal Outstanding for Financial Instruments for which Fair Value Option has been Elected (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Loans held for sale, unpaid principal balance	$ 591,397	$ 375,274
Loans held for sale, fair value	611,277	384,375
Loans held for sale, fair value over/(under) unpaid principal balance	$ 19,880	$ 9,101

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
YTD Losses, Loans held for sale			$ (2)	$ (4)
YTD Losses, Individually assessed loans			568
YTD Losses, Impaired Loans				1,831
YTD Losses, OREO			(440)	(785)
YTD Losses, Mortgage servicing rights	$ (710)	$ (710)	(710)
Loans held for sale	611,277	611,277	611,277	384,375
Individually assessed loans				123,505
OREO	29,947	29,947	29,947	15,515
Mortgage servicing rights	20,200	20,200	20,200
Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
YTD Losses, Mortgage servicing rights			(710)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	14,707	14,707	14,707	3,139
Individually assessed loans	59,488	59,488	59,488
Impaired Loans				68,213
OREO	29,947	29,947	29,947	15,515
Fair Value, Measurements, Nonrecurring [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing rights	20,200	20,200	20,200
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	0	0	0	0
Individually assessed loans	0	0	0
Impaired Loans				0
OREO	0	0	0	0
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing rights	0	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	14,707	14,707	14,707	3,139
Individually assessed loans	49,732	49,732	49,732
Impaired Loans				55,792
OREO	29,898	29,898	29,898	15,495
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing rights	0	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	0	0	0	0
Individually assessed loans	9,756	9,756	9,756
Impaired Loans				12,421
OREO	49	49	49	$ 20
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing rights	$ 20,200	$ 20,200	$ 20,200

Fair Value Measurements - Sum_3

Fair Value Measurements - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 2,062,813	$ 837,493	$ 1,253,573	$ 1,020,396
Securities available for sale	2,799,941	2,437,296
Securities held to maturity	1,221	1,446
Other securities	251,161	222,161
Loans held for sale	625,984	387,514
Net loans	17,992,402	13,712,129
Mortgage servicing rights	20,200	0
Deposits	19,893,843	13,852,421
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,062,813	837,493
Securities available for sale	2,799,941	2,437,296
Securities held to maturity	1,221	1,446
Other securities	251,161	222,161
Loans held for sale	625,984	387,514
Net loans	17,777,281	13,635,072
Derivative financial assets	29,578	4,527
Mortgage servicing rights	20,200
Deposits	19,893,843	13,852,421
Short-term borrowings	176,168	374,654
Long-term borrowings	1,633,891	1,838,029
Derivative financial liabilities	14,307	3,065
Carrying Amount [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	9,875	8,894
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,062,813	837,493
Securities available for sale	2,799,941	2,437,296
Securities held to maturity	1,220	1,447
Other securities	238,603	211,053
Loans held for sale	625,984	387,514
Net loans	17,191,993	13,185,955
Derivative financial assets	29,578	4,527
Mortgage servicing rights	20,200
Deposits	19,902,498	13,843,077
Short-term borrowings	176,168	374,654
Long-term borrowings	1,597,685	1,820,297
Derivative financial liabilities	14,307	3,065
Fair Value [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	9,875	8,894
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Securities available for sale	6,432	6,586
Securities held to maturity	0	0
Other securities	0	0
Loans held for sale	0	0
Net loans	0	0
Derivative financial assets	0	0
Mortgage servicing rights	0
Deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Derivative financial liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	9,875	8,894
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2,062,813	837,493
Securities available for sale	2,780,672	2,426,007
Securities held to maturity	200	427
Other securities	0	0
Loans held for sale	60,187	3,139
Net loans	0	0
Derivative financial assets	9,158	9
Mortgage servicing rights	0
Deposits	19,902,498	13,843,077
Short-term borrowings	176,168	374,654
Long-term borrowings	1,597,685	1,820,297
Derivative financial liabilities	14,307	3,065
Significant Other Observable Inputs (Level 2) [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Securities available for sale	12,837	4,703
Securities held to maturity	1,020	1,020
Other securities	238,603	211,053
Loans held for sale	565,797	384,375
Net loans	17,191,993	13,185,955
Derivative financial assets	20,420	4,518
Mortgage servicing rights	20,200
Deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Derivative financial liabilities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	$ 0	$ 0

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	May 12, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares of stock, option plan, maximum						2,300,000
Maximum number of shares of restricted stock or shares subject to a restricted stock units award granted					50,000
Maximum number of options and SARs					100,000
Maximum number of stock options and SARs awarded					10,000
Maximum number of Shares of restricted stock or shares subject to a restricted stock units award granted to individual non-employee director					10,000
Vesting period of awards			1/3 per year
Recognition of compensation expense	$ 1,369	$ 1,198	$ 2,622	$ 2,311
Maximum term for awards granted (years)			10 years
Shares issued related stock option exercises			14,994	47,960
Total intrinsic value of options exercised			$ 249	$ 713
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			0 months

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Stock Option Plans (Detail) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)$ / sharesshares	Jun. 30, 2019shares
Disclosure Stock Based Compensation Stock Option Plan [Abstract]
Shares, Outstanding, Beginning balance | shares	1,715,316
Shares, Assumed | shares	117,116
Shares, Granted | shares	183,551
Shares, Exercised | shares	(14,994)	(47,960)
Shares, Forfeited or expired | shares	(8,915)
Shares, Outstanding, Ending balance | shares	1,992,074
Shares, Exercisable at June 30, 2020 | shares	1,446,719
Aggregate Intrinsic Value, Outstanding at June 30, 2020 | $	$ 2,513
Aggregate Intrinsic Value, Exercisable at June 30, 2020 | $	$ 2,513
Weighted Average Remaining Contractual Term, Outstanding at June 30, 2020	5 years 6 months
Weighted Average Remaining Contractual Term, Exercisable at June 30, 2020	4 years 4 months 24 days
Weighted Average Exercise Price, Outstanding, Beginning balance | $ / shares	$ 34.49
Weighted Average Exercise Price, Assumed | $ / shares	12.14
Weighted Average Exercise Price, Granted | $ / shares	32.51
Weighted Average Exercise Price, Exercised | $ / shares	20.48
Weighted Average Exercise Price, Forfeited or expired | $ / shares	28.47
Weighted Average Exercise Price, Outstanding, Ending balance | $ / shares	33.13
Weighted Average Exercise Price, Exercisable | $ / shares	$ 31.67

Stock Based Compensation - Stat

Stock Based Compensation - Status of United's Nonvested Stock Option Awards (Detail)	6 Months Ended
	Jun. 30, 2020$ / sharesshares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Nonvested, Beginning balance | shares	589,737
Shares, Granted | shares	183,551
Shares, Vested | shares	(225,582)
Shares, Forfeited or expired | shares	(2,351)
Shares, Nonvested, Ending balance | shares	545,355
Weighted-Average Grant Date Fair Value Per Share, Nonvested Beginning balance | $ / shares	$ 7.62
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	5.65
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	7.68
Weighted-Average Grant Date Fair Value Per Share, Forfeited or expired | $ / shares	7.32
Weighted-Average Grant Date Fair Value Per Share, Nonvested Ending balance | $ / shares	$ 6.93

Stock Based Compensation - Chan

Stock Based Compensation - Changes to United's Restricted Common Shares (Detail) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2020$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning balance | shares	247,896
Shares, Granted | shares	175,495
Shares, Vested | shares	(88,671)
Shares, Forfeited | shares	(946)
Number of Shares, Outstanding, Ending balance | shares	333,774
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Beginning balance | $ / shares	$ 39.20
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	32.51
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	39.32
Weighted-Average Grant Date Fair Value Per Share, Forfeited | $ / shares	36.58
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Ending balance | $ / shares	$ 35.66

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial gains (losses), before tax			$ 60,894
Unrecognized actuarial gains (losses), net of tax			$ 46,706
Amortization expected to be recognized	$ 5,802
Amortization expected to be recognized, net of tax	4,450
Employer discretionary contribution amount	$ 0	$ 0

Employee Benefit Plans - Net Pe

Employee Benefit Plans - Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 715	$ 561	$ 1,430	$ 1,116
Interest cost	1,286	1,459	2,573	2,901
Expected return on plan assets	(2,630)	(2,356)	(5,259)	(4,686)
Recognized net actuarial loss	1,442	1,184	2,884	2,355
Net periodic pension cost	$ 813	$ 848	$ 1,628	$ 1,686
Weighted-Average Assumptions:
Discount Rate	3.42%	4.52%	3.42%	4.52%
Expected return on assets	6.75%	7.00%	6.75%	7.00%
Prior to Age 40 [Member]
Weighted-Average Assumptions:
Rate of compensation increase	5.00%		5.00%
Ages 40 to 54 [Member]
Weighted-Average Assumptions:
Rate of compensation increase	4.00%		4.00%
Prior to Age 45 [Member]
Weighted-Average Assumptions:
Rate of compensation increase		3.50%		3.50%
Otherwise [Member]
Weighted-Average Assumptions:
Rate of compensation increase	3.50%	3.00%	3.50%	3.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Taxes [Line Items]
Accrued interest related to uncertain tax positions	$ 718	$ 726	$ 718	$ 726
Effective tax rate	17.30%	20.69%	18.38%	21.04%

Comprehensive Income - Componen

Comprehensive Income - Components of Total Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net Income	$ 52,686	$ 40,183	$ 67,207	$ 63,642	$ 92,869	$ 130,849
AFS securities with OTTI charges during the period	0		(75)		0	(75)
Related income tax effect	0		17		0	17
Less: OTTI charges recognized in net income	0		75		0	75
Related income tax benefit	0		(17)		0	(17)
Reclassification of previous noncredit OTTI to credit OTTI	0		2,188		0	2,188
Related income tax benefit	0		(510)		0	(510)
Net unrealized (losses) gains on AFS securities with OTTI	0		1,678		0	1,678
Change in net unrealized gain on AFS securities arising during the period	37,756		21,141		60,859	43,379
Related income tax effect	(8,797)		(4,925)		(14,180)	(10,107)
Net reclassification adjustment for (gains) losses included in net income	(1,466)		130		(1,641)	(218)
Related income tax expense (benefit)	341		(30)		382	51
Total AFS securities - all other	27,834		16,316		45,420	33,105
Net effect of AFS securities on other comprehensive income	27,834		17,994		45,420	34,783
Cash flow hedge derivatives:
Unrealized loss on cash flow hedge	(1,659)		0		(1,659)	0
Related income tax effect	387		0		387	0
Net effect of cash flow hedge derivatives on other comprehensive income	(1,272)		0		(1,272)	0
Pension plan:
Recognized net actuarial loss	1,442		1,184		2,884	2,355
Related income tax benefit	(329)		(275)		(659)	(536)
Net effect of change in pension plan asset on other comprehensive income	1,113		909		2,225	1,819
Net current-period other comprehensive income, net of tax	27,675	18,698	18,903	17,699	46,373	36,602
Total Comprehensive Income	$ 80,361	$ 58,881	$ 86,110	$ 81,341	$ 139,242	$ 167,451

Comprehensive Income - Compon_2

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 3,343,702	$ 3,363,833	$ 3,286,891	$ 3,251,624	$ 3,363,833	$ 3,251,624
Net current-period other comprehensive income, net of tax	27,675	18,698	18,903	17,699	46,373	36,602
Ending Balance	4,197,855	3,343,702	3,333,858	3,286,891	4,197,855	3,333,858
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(42,825)			(42,825)
Other comprehensive income before reclassification					0
Amounts reclassified from accumulated other comprehensive income					2,225
Net current-period other comprehensive income, net of tax					2,225
Ending Balance	(40,600)				(40,600)
Unrealized Gains/Losses on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		7,956			7,956
Other comprehensive income before reclassification					46,679
Amounts reclassified from accumulated other comprehensive income					(1,259)
Net current-period other comprehensive income, net of tax					45,420
Ending Balance	53,376				53,376
Accumulated Gain (Loss) Net Cash Flow Hedge Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		0			0
Other comprehensive income before reclassification					(1,272)
Amounts reclassified from accumulated other comprehensive income					0
Net current-period other comprehensive income, net of tax					(1,272)
Ending Balance	(1,272)				(1,272)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(16,171)	(34,869)	(39,270)	(57,019)	(34,869)	(57,019)
Other comprehensive income before reclassification					45,407
Amounts reclassified from accumulated other comprehensive income					966
Net current-period other comprehensive income, net of tax	27,675	18,698	18,903	17,699	46,373
Ending Balance	$ 11,504	$ (16,171)	$ (20,367)	$ (39,270)	$ 11,504	$ (20,367)

Comprehensive Income - Reclassi

Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Available for sale ("AFS") securities:
Income before income taxes		$ 63,707		$ 84,736		$ 113,779	$ 165,706
Related income tax effect		(11,021)		(17,529)		(20,910)	(34,857)
Net income		52,686	$ 40,183	67,207	$ 63,642	92,869	130,849
Cash flow hedge:
(gains) included in net income		63,707		84,736		113,779	165,706
Related income tax effect		11,021		17,529		20,910	34,857
Pension plan:
Income before income taxes		63,707		84,736		113,779	165,706
Related income tax effect		(11,021)		(17,529)		(20,910)	(34,857)
Net income		$ 52,686	$ 40,183	$ 67,207	$ 63,642	92,869	$ 130,849
Reclassification out of Accumulated Other Comprehensive Income [Member]
Available for sale ("AFS") securities:
Net income						966
Pension plan:
Net income						966
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains/Losses on AFS Securities [Member]
Available for sale ("AFS") securities:
Net reclassification adjustment for losses (gains) included in net income						(1,641)
Income before income taxes						(1,641)
Related income tax effect						382
Net income						(1,259)
Cash flow hedge:
(gains) included in net income						(1,641)
Related income tax effect						(382)
Pension plan:
Income before income taxes						(1,641)
Related income tax effect						382
Net income						(1,259)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss) Net Cash Flow Hedge Parent [Member]
Available for sale ("AFS") securities:
Income before income taxes						0
Related income tax effect						0
Cash flow hedge:
Net reclassification adjustment for losses						0
(gains) included in net income						0
Related income tax effect						0
Pension plan:
Income before income taxes						0
Related income tax effect						0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Available for sale ("AFS") securities:
Income before income taxes						2,884
Related income tax effect						(659)
Net income						2,225
Cash flow hedge:
(gains) included in net income						2,884
Related income tax effect						659
Pension plan:
Recognized net actuarial loss	[1]					2,884
Income before income taxes						2,884
Related income tax effect						(659)
Net income						$ 2,225
[1]	ThisAOCI component is included in the computation of net periodic pension cost (see Note 16, Employee Benefit Plans)

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation of Numerator and Denominator of Basic Earnings Per Share with that of Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Distributed earnings allocated to common stock	$ 45,298	$ 34,604	$ 80,785	$ 69,276
Undistributed earnings allocated to common stock	7,262	32,446	11,840	61,276
Net earnings allocated to common shareholders	$ 52,560	$ 67,050	$ 92,625	$ 130,552
Average common shares outstanding	119,823,652	101,773,643	110,559,363	101,833,880
Equivalents from stock options	64,171	274,202	65,613	265,929
Average diluted shares outstanding	119,887,823	102,047,845	110,624,976	102,099,809
Earnings per basic common share	$ 0.44	$ 0.66	$ 0.84	$ 1.28
Earnings per diluted common share	$ 0.44	$ 0.66	$ 0.84	$ 1.28

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2020Trust
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Number of statutory business trusts	19
Percentage of equity shares of each trust owned by the company	100.00%

Variable Interest Entities - In

Variable Interest Entities - Information Related to Statutory Trusts (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020USD ($)
United Statutory Trust III [Member]
Variable Interest Entity [Line Items]
Issuance Date	Dec. 17, 2003
Amount of Capital Securities Issued	$ 20,000
Stated Interest Rate	3-month
Maturity Date	Dec. 17, 2033
United Statutory Trust IV [Member]
Variable Interest Entity [Line Items]
Issuance Date	Dec. 19, 2003
Amount of Capital Securities Issued	$ 25,000
Stated Interest Rate	3-month
Maturity Date	Jan. 23, 2034
United Statutory Trust V [Member]
Variable Interest Entity [Line Items]
Issuance Date	Jul. 12, 2007
Amount of Capital Securities Issued	$ 50,000
Stated Interest Rate	3-month
Maturity Date	Oct. 1, 2037
United Statutory Trust VI [Member]
Variable Interest Entity [Line Items]
Issuance Date	Sep. 20, 2007
Amount of Capital Securities Issued	$ 30,000
Stated Interest Rate	3-month
Maturity Date	Dec. 15, 2037
Premier Statutory Trust II [Member]
Variable Interest Entity [Line Items]
Issuance Date	Sep. 25, 2003
Amount of Capital Securities Issued	$ 6,000
Stated Interest Rate	3-month
Maturity Date	Oct. 8, 2033
Premier Statutory Trust III [Member]
Variable Interest Entity [Line Items]
Issuance Date	May 16, 2005
Amount of Capital Securities Issued	$ 8,000
Stated Interest Rate	3-month
Maturity Date	Jun. 15, 2035
Premier Statutory Trust IV [Member]
Variable Interest Entity [Line Items]
Issuance Date	Jun. 20, 2006
Amount of Capital Securities Issued	$ 14,000
Stated Interest Rate	3-month
Maturity Date	Sep. 23, 2036
Premier Statutory Trust V [Member]
Variable Interest Entity [Line Items]
Issuance Date	Dec. 14, 2006
Amount of Capital Securities Issued	$ 10,000
Stated Interest Rate	3-month
Maturity Date	Mar. 1, 2037
Centra Statutory Trust I [Member]
Variable Interest Entity [Line Items]
Issuance Date	Sep. 20, 2004
Amount of Capital Securities Issued	$ 10,000
Stated Interest Rate	3-month
Maturity Date	Sep. 20, 2034
Centra Statutory Trust II [Member]
Variable Interest Entity [Line Items]
Issuance Date	Jun. 15, 2006
Amount of Capital Securities Issued	$ 10,000
Stated Interest Rate	3-month
Maturity Date	Jul. 7, 2036
Virginia Commerce Trust II [Member]
Variable Interest Entity [Line Items]
Issuance Date	Dec. 19, 2002
Amount of Capital Securities Issued	$ 15,000
Stated Interest Rate	6-month
Maturity Date	Dec. 19, 2032
Virginia Commerce Trust III [Member]
Variable Interest Entity [Line Items]
Issuance Date	Dec. 20, 2005
Amount of Capital Securities Issued	$ 25,000
Stated Interest Rate	3-month
Maturity Date	Feb. 23, 2036
Cardinal Statutory Trust I [Member]
Variable Interest Entity [Line Items]
Issuance Date	Jul. 27, 2004
Amount of Capital Securities Issued	$ 20,000
Stated Interest Rate	3-month
Maturity Date	Sep. 15, 2034
UFBC Capital Trust I [Member]
Variable Interest Entity [Line Items]
Issuance Date	Dec. 30, 2004
Amount of Capital Securities Issued	$ 5,000
Stated Interest Rate	3-month
Maturity Date	Mar. 15, 2035
Carolina Financial Capital Trust I [Member]
Variable Interest Entity [Line Items]
Issuance Date	Dec. 19, 2002
Amount of Capital Securities Issued	$ 5,000
Stated Interest Rate	Prime
Maturity Date	Dec. 31, 2032
Carolina Financial Capital Trust II [Member]
Variable Interest Entity [Line Items]
Issuance Date	Nov. 5, 2003
Amount of Capital Securities Issued	$ 10,000
Stated Interest Rate	3-month
Maturity Date	Jan. 7, 2034
Greer Capital Trust I [Member]
Variable Interest Entity [Line Items]
Issuance Date	Oct. 12, 2004
Amount of Capital Securities Issued	$ 6,000
Stated Interest Rate	3-month
Maturity Date	Oct. 18, 2034
Greer Capital Trust II [Member]
Variable Interest Entity [Line Items]
Issuance Date	Dec. 28, 2006
Amount of Capital Securities Issued	$ 5,000
Stated Interest Rate	3-month
Maturity Date	Jan. 30, 2037
First South Preferred Trust I [Member]
Variable Interest Entity [Line Items]
Issuance Date	Sep. 26, 2003
Amount of Capital Securities Issued	$ 10,000
Stated Interest Rate	3-month
Maturity Date	Sep. 30, 2033

Variable Interest Entities - Su

Variable Interest Entities - Summary of Quantitative Information Related to Significant Involvement in Unconsolidated Variable Interest Entities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Variable Interest Entity [Line Items]
Aggregate Assets	$ 26,234,973	$ 19,662,324
Aggregate Liabilities	22,037,118	16,298,491
Risk Of Loss	26,234,973		$ 19,882,539
Trust Preferred Securities [Member]
Variable Interest Entity [Line Items]
Risk Of Loss	10,606	9,261
Trust Preferred Securities [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate Assets	295,263	257,941
Aggregate Liabilities	$ 284,657	$ 248,680

Segment Information - Additiona

Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2020Segment
Segment Reporting [Abstract]
Number of business segment	2

Segment Information - Summary o

Segment Information - Summary of Segment Reporting Information (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net interest income	$ 170,602		$ 150,553		$ 312,120	$ 294,721
Provision for loans losses	45,911		5,417		73,030	10,413
Other income	88,390		39,795		125,196	71,018
Other expense	149,374		100,195		250,507	189,620
Income taxes	11,021		17,529		20,910	34,857
Net income	52,686	$ 40,183	67,207	$ 63,642	92,869	130,849
Total assets (liabilities)	26,234,973		19,882,539		26,234,973	19,882,539
Average assets (liabilities)	24,402,600		19,515,854		21,985,381	19,383,507
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	167,703		152,517		308,123	298,407
Provision for loans losses	45,911		5,417		73,030	10,413
Other income	20,301		18,398		39,868	36,050
Other expense	106,477		82,304		186,941	158,298
Income taxes	5,841		17,207		16,191	34,873
Net income	29,775		65,987		71,829	130,873
Total assets (liabilities)	25,924,599		19,735,901		25,924,599	19,735,901
Average assets (liabilities)	24,198,414		19,447,629		21,825,005	19,324,956
Operating Segments [Member] | Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	2,246		111		3,195	166
Provision for loans losses	0		0		0	0
Other income	71,013		23,501		92,203	39,607
Other expense	35,261		18,771		56,018	33,613
Income taxes	6,946		1,004		7,219	1,286
Net income	31,052		3,837		32,161	4,874
Total assets (liabilities)	730,637		442,188		730,637	442,188
Average assets (liabilities)	660,483		326,525		513,431	296,008
Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(2,556)		(3,209)		(5,245)	(6,532)
Provision for loans losses	0		0		0	0
Other income	47		53		56	255
Other expense	7,398		143		8,432	(77)
Income taxes	(1,766)		(682)		(2,500)	(1,302)
Net income	(8,141)		(2,617)		(11,121)	(4,898)
Total assets (liabilities)	25,678		16,729		25,678	16,729
Average assets (liabilities)	16,574		5,387		21,756	1,824
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net interest income	3,209		1,134		6,047	2,680
Provision for loans losses	0		0		0	0
Other income	(2,971)		(2,157)		(6,931)	(4,894)
Other expense	238		(1,023)		(884)	(2,214)
Income taxes	0		0		0	0
Net income	0		0		0	0
Total assets (liabilities)	(445,941)		(312,279)		(445,941)	(312,279)
Average assets (liabilities)	$ (472,871)		$ (263,687)		$ (374,811)	$ (239,281)