United Bankshares (UBSI) 10-Q 9 Aug 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Jul. 31, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Fiscal Year Focus	2021
Document Period End Date	Jun. 30, 2021
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		129,203,593
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, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 306,648	$ 297,369
Interest-bearing deposits with other banks	3,369,823	1,910,876
Federal funds sold	925	823
Total cash and cash equivalents	3,677,396	2,209,068
Securities available for sale at estimated fair value (amortized cost-$3,221,432 at June 30, 2021 and $2,868,346 at December 31, 2020, allowance for credit losses of $0 at June 30, 2021 and December 31, 2020)	3,277,074	2,953,359
Securities held to maturity, net of allowance for credit losses of $31 at June 30, 2021 and $23 at December 31, 2020 (estimated fair value-$1,020 at June 30, 2021 and $1,235 at December 31, 2020)	989	1,212
Equity securities at estimated fair value	11,507	10,718
Other investment securities	221,931	220,895
Loans held for sale (at fair value-$576,827 at June 30, 2021 and $698,341 at December 31, 2020)	576,827	718,937
Loans and leases	16,921,652	17,622,583
Less: Unearned income	(33,651)	(31,170)
Loans and leases, net of unearned income	16,888,001	17,591,413
Less: Allowance for loan and lease losses	(217,545)	(235,830)
Net loans and leases	16,670,456	17,355,583
Bank premises and equipment	171,361	175,824
Operating lease right-of-use assets	66,635	69,520
Goodwill	1,810,040	1,796,848
Mortgage servicing rights, net of valuation allowance of $1,633 at June 30, 2021 and $1,383 at December 31, 2020	22,540	20,955
Accrued interest receivable, net of allowance for credit losses of $29 at June 30, 2021 and $250 at December 31, 2020	60,877	66,832
Other assets	623,293	584,496
TOTAL ASSETS	27,190,926	26,184,247
Deposits:
Noninterest-bearing	8,283,454	7,405,260
Interest-bearing	13,283,937	13,179,900
Total deposits	21,567,391	20,585,160
Borrowings:
Securities sold under agreements to repurchase	127,745	142,300
Federal Home Loan Bank ("FHLB") borrowings	533,365	584,532
Other long-term borrowings	280,657	279,837
Reserve for lending-related commitments	20,897	19,250
Operating lease liabilities	70,546	73,213
Accrued expenses and other liabilities	196,612	202,335
TOTAL LIABILITIES	22,797,213	21,886,627
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-134,165,663 and 133,809,374 at June 30, 2021 and December 31, 2020, respectively, including 4,962,070 and 4,620,867 shares in treasury at June 30, 2021 and December 31, 2020, respectively	335,414	334,523
Surplus	2,901,591	2,894,471
Retained earnings	1,316,607	1,205,395
Accumulated other comprehensive gain	10,523	22,370
Treasury stock, at cost	(170,422)	(159,139)
TOTAL SHAREHOLDERS' EQUITY	4,393,713	4,297,620
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 27,190,926	$ 26,184,247

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 3,221,432	$ 2,868,346
Securities held to maturity	1,020	1,235
Loans held for sale at fair value	$ 576,827	$ 698,341
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	134,165,663	133,809,374
Common stock, shares in treasury	4,962,070	4,620,867
Allowance for credit losses on securities held for sale	$ 0	$ 0
Allowances for credit losses on securities held to maturity	31	23
Allowance for credit loss on accrued interest receivable	29	250
Mortgage servicing rights, net of valuation allowance	$ 1,633	$ 1,383

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest income
Interest and fees on loans	$ 182,741	$ 179,311	$ 371,414	$ 338,165
Interest on federal funds sold and other short-term investments	1,757	1,868	3,650	5,833
Interest and dividends on securities:
Taxable	13,846	16,241	27,372	33,210
Tax-exempt	1,842	1,297	3,407	1,991
Total interest income	200,186	198,717	405,843	379,199
Interest expense
Interest on deposits	11,012	19,249	22,997	46,726
Interest on short-term borrowings	182	196	360	654
Interest on long-term borrowings	2,475	8,670	5,009	19,699
Total interest expense	13,669	28,115	28,366	67,079
Net interest income	186,517	170,602	377,477	312,120
Provision for credit losses	(8,879)	45,911	(8,736)	73,030
Net interest income after provision for credit losses	195,396	124,691	386,213	239,090
Other income
Income from bank-owned life insurance	1,658	1,291	3,061	3,679
Mortgage loan servicing income	2,386	1,534	4,741	1,534
Net investment securities gains	24	1,510	2,633	1,706
Other income	2,449	547	4,455	1,271
Total other income	62,846	88,390	155,419	125,196
Other expense
Employee compensation	68,557	68,664	140,969	113,205
Employee benefits	14,470	12,779	29,920	23,565
Net occupancy expense	10,101	10,318	21,042	19,380
Other real estate owned ("OREO") expense	372	607	3,997	1,513
Equipment expense	5,830	5,004	11,874	8,849
Data processing expense	6,956	15,926	13,982	21,432
Mortgage loan servicing expense and impairment	3,599	2,510	6,776	2,648
Bankcard processing expense	478	392	878	869
FDIC insurance expense	1,800	2,782	3,800	5,182
Other expense	26,788	30,392	54,640	53,864
Total other expense	138,951	149,374	287,878	250,507
Income before income taxes	119,291	63,707	253,754	113,779
Income taxes	24,455	11,021	52,020	20,910
Net income	$ 94,836	$ 52,686	$ 201,734	$ 92,869
Earnings per common share:
Basic	$ 0.73	$ 0.44	$ 1.56	$ 0.84
Diluted	$ 0.73	$ 0.44	$ 1.56	$ 0.84
Average outstanding shares:
Basic	128,750,851	119,823,652	128,693,616	110,559,363
Diluted	129,033,988	119,887,823	128,946,280	110,624,976
Fees From Trust Services [Member]
Other income
Revenue from contract	$ 4,193	$ 3,261	$ 7,956	$ 6,744
Fees from Brokerage Services [Member]
Other income
Revenue from contract	3,654	2,651	7,977	5,567
Fees from Deposit Services [Member]
Other income
Revenue from contract	9,396	8,055	18,292	16,012
Bankcard Fees and Merchant Discounts [Member]
Other income
Revenue from contract	1,368	718	2,432	1,711
Other Service Charges, Commissions, and Fees [Member]
Other income
Revenue from contract	775	610	1,534	1,128
Mortgage Banking [Member]
Other income
Revenue from contract	$ 36,943	$ 68,213	$ 102,338	$ 85,844

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 94,836	$ 52,686	$ 201,734	$ 92,869
Change in net unrealized gain (loss) on available-for-sale ("AFS") securities, net of tax	13,837	27,834	(22,528)	45,420
Change in net unrealized (loss) gain on cash flow hedge, net of tax	(6,044)	(1,272)	8,943	(1,272)
Change in pension plan assets, net of tax	869	1,113	1,738	2,225
Comprehensive income, net of tax	$ 103,498	$ 80,361	$ 189,887	$ 139,242

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Common Stock [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Surplus [Member]	Surplus [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]		Accumulated Other Comprehensive Income (Loss) [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Treasury Stock [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]
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
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 of Carolina Financial Corporation, Values	$ 817,830		70,079		747,751		0		0			0
Acquisition of Carolina Financial Corporation, 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
Beginning Balance at Dec. 31, 2020	4,297,620		$ 334,523		2,894,471		1,205,395		22,370	[1]		(159,139)
Beginning Balance, shares at Dec. 31, 2020			133,809,374
Net income	106,898		$ 0		0		106,898		0			0
Other comprehensive income, net of tax	(20,509)		0		0		0		(20,509)			0
Comprehensive income, net of tax	86,389
Stock based compensation expense	1,688		0		1,688		0		0			0
Purchase of treasury stock	(11,210)		0		0		0		0			(11,210)
Cash dividends	(45,254)		0		0		(45,254)		0			0
Grant of restricted stock	0		$ 452		(452)		0		0			0
Grant of restricted stock, shares			180,901
Common stock options exercised	3,465		$ 365		3,100		0		0			0
Common stock options exercised, shares			145,621
Ending Balance at Mar. 31, 2021	4,332,698		$ 335,340		2,898,807		1,267,039		1,861			(170,349)
Ending Balance, shares at Mar. 31, 2021			134,135,896
Beginning Balance at Dec. 31, 2020	4,297,620		$ 334,523		2,894,471		1,205,395		22,370	[1]		(159,139)
Beginning Balance, shares at Dec. 31, 2020			133,809,374
Net income	201,734
Other comprehensive income, net of tax	(11,847)								(11,847)	[1]
Comprehensive income, net of tax	$ 189,887
Common stock options exercised, shares	173,945
Ending Balance at Jun. 30, 2021	$ 4,393,713		$ 335,414		2,901,591		1,316,607		10,523	[1]		(170,422)
Ending Balance, shares at Jun. 30, 2021			134,165,663
Beginning Balance at Mar. 31, 2021	4,332,698		$ 335,340		2,898,807		1,267,039		1,861			(170,349)
Beginning Balance, shares at Mar. 31, 2021			134,135,896
Net income	94,836		$ 0		0		94,836		0			0
Other comprehensive income, net of tax	8,662		0		0		0		8,662			0
Comprehensive income, net of tax	103,498
Stock based compensation expense	1,892		0		1,892		0		0			0
Cash dividends	(45,268)		0		0		(45,268)		0			0
Grant of restricted stock	0		$ 4		(4)		0		0			0
Grant of restricted stock, shares			1,443
Forfeiture of restricted stock	0		$ 0		73		0		0			(73)
Common stock options exercised	893		$ 70		823		0		0			0
Common stock options exercised, shares			28,324
Ending Balance at Jun. 30, 2021	$ 4,393,713		$ 335,414		$ 2,901,591		$ 1,316,607		$ 10,523	[1]		$ (170,422)
Ending Balance, shares at Jun. 30, 2021			134,165,663
[1]	All amounts are net-of-tax.

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Acquisition, Shares			28,031,501
Common Stock [Member]
Cash dividends per share	$ 0.35	$ 0.35	$ 0.35	$ 0.35
Grant of restricted stock, shares	1,443	180,901		175,495
Forfeiture of restricted stock, shares	1,971			946
Common stock options exercised, shares	28,324	145,621	300	14,694
Treasury Stock [Member]
Purchase of treasury stock, shares		339,229	6	19,314
Carolina Financial Corporation [Member] | Common Stock [Member]
Acquisition, Shares			28,031,501

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 351,959	$ 72,099
INVESTING ACTIVITIES
Proceeds from maturities and calls of securities held to maturity	215	210
Proceeds from sales of securities available for sale	39,294	164,850
Proceeds from maturities and calls of securities available for sale	361,699	248,856
Purchases of securities available for sale	(759,335)	(159,548)
Proceeds from sales of equity securities	1,250	1,042
Purchases of equity securities	(1,305)	(514)
Proceeds from sales and redemptions of other investment securities	7,558	97,177
Purchases of other investment securities	(14,199)	(110,191)
Purchases of bank-owned life insurance policies	(50,000)	0
Redemption of bank-owned life insurance policies	0	1,186
Purchases of bank premises and equipment	(6,537)	(6,831)
Proceeds from sales of bank premises and equipment	1,560	278
Proceeds from the sales of OREO properties	2,703	5,106
Acquisition of Carolina Financial Corporation, net of cash paid	0	629,107
Net change in loans	710,855	(1,028,035)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	293,758	(157,307)
FINANCING ACTIVITIES
Cash dividends paid	(90,715)	(71,862)
Acquisition of treasury stock	(11,210)	(608)
Proceeds from exercise of stock options	4,361	288
Repayment of long-term Federal Home Loan Bank borrowings	(550,000)	(828,000)
Proceeds from issuance of long-term Federal Home Loan Bank borrowings	500,000	250,000
Changes in:
Deposits	984,730	2,159,196
Federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings	(14,555)	(198,486)
NET CASH PROVIDED BY FINANCING ACTIVITIES	822,611	1,310,528
Increase in cash and cash equivalents	1,468,328	1,225,320
Cash and cash equivalents at beginning of year	2,209,068	837,493
Cash and cash equivalents at end of period	3,677,396	2,062,813
Noncash investing activities:
Transfers of loans to OREO	2,261	18,925
Carolina Financial [Member]
Acquisition of Carolina Financial:
Assets acquired, net of cash	(7,190)	4,173,843
Liabilities assumed	6,002	4,301,885
Goodwill	$ 13,192	$ 316,765

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. 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 January 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2021-01, No. 2021-01 No. 2021-01 In August 2020, the FASB issued ASU No. 2020-06, 470-20) 815-40).” earnings-per-share No. 2020-06 No. 2020-06 In March 2020, the FASB issued ASU No. 2020-04, No. 2020-04 No. 2020-04 In January 2020, the FASB issued ASU No. 2020-01, No. 2020-01 No. 2020-01 In August 2018, the FASB issued ASU No. 2018-14 - 715-20): – No. 2018-14 No. 2018-14

Mergers and Acquisitions

Mergers and Acquisitions	6 Months Ended
	Jun. 30, 2021
Business Combinations [Abstract]
Mergers and Acquisitions	2. MERGERS AND ACQUISITIONS Community Bankers Trust Corporation On June 2, 2021, United entered into an Agreement and Plan of Reorganization (the “Community Bankers Trust Agreement”) with Community Bankers Trust Corporation (“Community Bankers Trust”), a Virginia corporation headquartered in Richmond, Virginia. In accordance with the Community Bankers Trust Agreement, Community Bankers Trust will The Community Bankers Trust Agreement provides that upon consummation of the Community Bankers Trust Merger, each outstanding share of common stock of Community Bankers Trust will be converted into the right to receive 0.3173 shares of United common stock, par value $2.50 per share. Pursuant to the Community Bankers Trust Agreement, at the effective time of the Community Bankers Trust Merger, each outstanding Community Bankers Trust stock option granted under a Community Bankers Trust stock plan, whether vested or unvested as of the date of the Community Bankers Trust Agreement, will will At the effective time of the Community Bankers Trust Merger, Essex Bank, a wholly-owned subsidiary of Community Bankers Trust, will merge with and into United Bank, a wholly-owned subsidiary of United (the “Essex Bank Merger”). United Bank will survive the Essex Bank Merger and continue to exist as a Virginia banking corporation. The acquisition of Community Bankers Trust will enhance United’s existing presence in the DC Metro MSA and will take United into new markets including Baltimore, Annapolis, Lynchburg, Richmond, and the Northern Neck of Virginia. It also strategically connects our Mid-Atlantic As of June 30, 2021, Community Bankers Trust had $1,754,213 in total assets, $1,209,784 in gross loans and $1,488,828 in deposits. The merger agreement was approved by the boards of directors of both companies. The merger is expected to close in the fourth quarter of 2021, subject to satisfaction of customary closing conditions, including receipt of customary regulatory approvals and approval by the shareholders of Community Bankers Trust. Carolina Financial Corporation 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 “Carolina Financial Merger”), pursuant to the terms of the Agreement and Plan of Merger, dated November 17, 2019, by and between United and Carolina Financial (the “Carolina Financial Agreement”). Upon completion of the Carolina Financial Merger, Carolina Financial ceased to exist and United survived and continues to exist as a West Virginia corporation. Under the terms of the Carolina Financial 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 Carolina Financial Agreement, as of the effective time of the Carolina Financial Merger, each outstanding Carolina Financial stock option, whether vested or unvested as of the date of the Carolina Financial 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 Carolina Financial 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 Carolina Financial 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 Carolina Financial Merger, CresCom Bank, a wholly-owned subsidiary of Carolina Financial, merged with and into United Bank, a wholly-owned subsidiary of United (the “CresCom Bank Merger”). United Bank survived the CresCom Bank Merger and continues to exist as a Virginia banking corporation. CresCom Bank owned and operated Crescent Mortgage Company (“Crescent”), which is based in Atlanta, Georgia. As a result of the CresCom Bank Merger, Crescent is now a wholly-owned subsidiary of United Bank. For the second quarter and first half of 2021, United did not record any acquisition-related costs associated with the Carolina Financial Merger as compared to acquisition-related costs of $46,449 and $48,009 for the second quarter and first half of 2020. The Carolina Financial 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. Carolina Financial had banking locations in North Carolina and South Carolina. As of the Acquisition Date, Carolina Financial had $5,004,990 in total assets, $3,292,635 in loans and leases, net of unearned income and $3,873,183 in deposits. The aggregate purchase price was $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 purchase price has been allocated to the identifiable 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 fair value discounts of $47,425 on the loans and leases acquired, $620 on investment securities, $272 on OREO, $4,831 on trust preferred issuances and $135 on subordinated notes, respectively, and premiums of $5,908 on buildings acquired, $4,357 on land acquired, $12,818 on interest-bearing deposits, and $468 on long-term FHLB advances, respectively. United also recorded an allowance for credit losses, including a reserve for unfunded commitments, of $50,562 on the loans and commitments acquired split between $19,797 for purchased credit deteriorated (“PCD”) loans and $30,765 for non-PCD Portfolio loans and leases 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 market loss assumptions and 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 and leases 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 PCD loans and leases acquired from Carolina Financial as of the Acquisition Date: Purchase price of PCD loans and leases at acquisition $ 1,023,531 Allowance for credit losses at acquisition 18,635 Non-credit 7,212 Par value (UPB) of acquired PCD loans and leases at acquisition $ 1,049,378 The consideration paid for Carolina Financial’s common equity and the amounts of acquired identifiable assets and liabilities assumed as of the 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 580,791 Loans held for sale 65,757 Net loans and leases 3,246,940 Premises and equipment 79,127 Operating lease right-of-use 9,861 Crescent trade name intangible 196 Core deposit intangible 3,408 Mortgage servicing rights 20,123 Other assets 159,218 Total identifiable assets $ 4,794,575 Identifiable liabilities: Deposits $ 3,884,977 Short-term borrowings 332,000 Long-term borrowings 42,738 Operating lease liability 9,861 Other liabilities 39,148 Total identifiable liabilities 4,308,724 Fair value of net assets acquired including identifiable intangible assets 485,851 Resulting goodwill $ 332,026 The operating results of United include operating results of acquired assets and assumed liabilities subsequent to the Acquisition Date. The operations of United’s North Carolina and South Carolina geographic area, which includes the acquired operations of Carolina Financial and Crescent Mortgage provided $104,069 in total revenues (net interest income plus other income), and $53,632 in net income for the first six months of 2021. These amounts are included in United’s consolidated financial statements as of and for the six months ended June 30, 2021. Carolina Financial’s results of operations prior to the Acquisition Date are not included in United’s consolidated results of operations.

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2021
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, estimated fair values, and allowance for credit losses of securities available for sale are summarized as follows. June 30, 2021 Amortized Gross Gross Allowance Estimated Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 14,908 $ 242 $ 3 $ 0 $ 15,147 State and political subdivisions 592,778 22,585 1,317 0 614,046 Residential mortgage-backed securities Agency 973,328 17,216 5,542 0 985,002 Non-agency 39,792 15 204 0 39,603 Commercial mortgage-backed securities Agency 634,647 21,212 3,302 0 652,557 Asset-backed securities 489,901 714 1,182 0 489,433 Single issue trust preferred securities 18,249 188 1,020 0 17,417 Other corporate securities 457,829 6,183 143 0 463,869 Total $ 3,221,432 $ 68,355 $ 12,713 $ 0 $ 3,277,074 December 31, 2020 Amortized Gross Gross Allowance Estimated Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 65,804 $ 543 $ 3 $ 0 $ 66,344 State and political subdivisions 538,082 27,330 252 0 565,160 Residential mortgage-backed securities Agency 905,230 24,134 473 0 928,891 Non-agency 21,639 137 0 0 21,776 Commercial mortgage-backed securities Agency 644,774 31,009 638 0 675,145 Asset-backed securities 297,834 204 3,415 0 294,623 Single issue trust preferred securities 18,230 167 1,370 0 17,027 Other corporate securities 376,753 7,648 8 0 384,393 Total $ 2,868,346 $ 91,172 $ 6,159 $ 0 $ 2,953,359 For the adoption of ASC Topic 326, “Financial Instruments—Credit Losses,” United made a policy election to exclude accrued interest from the amortized cost basis of available-for-sale Available-for-sale non-accrual non-accrual available-for-sale The following is a summary of securities available for sale which were in an unrealized loss position at June 30, 2021 and December 31, 2020. Less than 12 months 12 months or longer Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized June 30, 2021 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 252 $ 3 $ 252 $ 3 State and political subdivisions 63,639 1,254 4,920 63 68,559 1,317 Residential mortgage-backed securities Agency 393,743 5,542 0 0 393,743 5,542 Non-agency 20,261 204 0 0 20,261 204 Commercial mortgage-backed securities Agency 117,331 3,302 0 0 117,331 3,302 Asset-backed securities 143,276 272 145,807 910 289,083 1,182 Trust preferred collateralized debt obligations 0 0 0 0 0 0 Single issue trust preferred securities 0 0 13,188 1,020 13,188 1,020 Other corporate securities 47,259 143 0 0 47,259 143 Total $ 785,509 $ 10,717 $ 164,167 $ 1,996 $ 949,676 $ 12,713 Less than 12 months 12 months or longer Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized December 31, 2020 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 297 $ 3 $ 0 $ 0 $ 297 $ 3 State and political subdivisions 30,480 252 0 0 30,480 252 Residential mortgage-backed securities Agency 131,114 467 3,867 6 134,981 473 Non-agency 0 0 0 0 0 0 Commercial mortgage-backed securities Agency 83,395 638 0 0 83,395 638 Asset-backed securities 0 0 266,104 3,415 266,104 3,415 Trust preferred collateralized debt obligations 0 0 0 0 0 0 Single issue trust preferred securities 0 0 13,804 1,370 13,804 1,370 Other corporate securities 8,494 8 0 0 8,494 8 Total $ 253,780 $ 1,368 $ 283,775 $ 4,791 $ 537,555 $ 6,159 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. Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 Proceeds from sales and calls $ 131,464 $ 280,780 $ 400,993 $ 413,706 Gross realized gains 0 1,565 1,542 1,818 Gross realized losses 0 98 98 177 At June 30, 2021, gross unrealized losses on available for sale securities were $12,713 on 113 securities of a total portfolio of 1,005 available for sale securities. Securities with the most significant gross unrealized losses at June 30, 2021 consisted primarily of agency residential mortgage-backed securities and agency commercial mortgage-backed securities. In 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 $592,778 at June 30, 2021. As of June 30, 2021, approximately 59% 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 no securities within the portfolio were rated below investment grade as of June 30, 2021. 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 had credit losses at June 30, 2021. 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 $1,607,975 at June 30, 2021. Of the $1,607,975 amount, $634,647 was related to agency commercial mortgage-backed securities and $973,328 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 had credit losses at June 30, 2021. Non-agency United’s non-agency non-agency non-agency Asset-backed securities As of June 30, 2021, United’s asset-backed securities portfolio had a total amortized cost balance of $489,901. The entire portfolio was rated AA+ or better as of June 30, 2021. Approximately 55% of the portfolio relates to securities that 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. Approximately 41% of the portfolio relates to collateralized loan obligation securities that are all AAA rated. The remaining 4% of the portfolio relates to various other asset-backed securities that are all AAA rated. Upon reviewing this portfolio for the second quarter of 2021, it was determined that none of the asset-backed securities had credit losses. 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, 2021 consisted of $11,514 in investment grade bonds, $978 in split rated bonds, and $5,757 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 2021, it was determined that none of the single issue trust preferred securities had credit losses. Corporate securities As of June 30, 2021, United’s Corporate securities portfolio had a total amortized cost balance of $457,829. The majority of the portfolio consisted of debt issuances of corporations representing a variety of industries, including financial institutions. Of the $457,829 total amortized cost balance, 86% had at least one rating above investment grade, 2% was below 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 had credit losses at June 30, 2021. The amortized cost and estimated fair value of securities available for sale at June 30, 2021 and December 31, 2020 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, 2021 December 31, 2020 Amortized Estimated Value Amortized Estimated Value Due in one year or less $ 72,479 $ 72,978 $ 150,575 $ 151,651 Due after one year through five years 596,359 611,994 495,922 514,441 Due after five years through ten years 688,537 702,870 688,264 714,416 Due after ten years 1,864,057 1,889,232 1,533,585 1,572,851 Total $ 3,221,432 $ 3,277,074 $ 2,868,346 $ 2,953,359 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 $11,507 at June 30, 2021 and $10,718 at December 31, 2020. Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 Net gains recognized during the period $ 24 $ 43 $ 734 $ 65 Net gains recognized during the period on equity securities sold 0 1 788 7 Unrealized gains recognized during the period on equity securities still held at period end 24 43 51 114 Unrealized losses recognized during the period on equity securities still held at period end 0 (1 ) (105 ) (56 ) Other investment securities During the second quarter of 2021, United evaluated all of its cost method investments to determine if certain events or changes in circumstances during the second quarter of 2021 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 $1,912,762 and $1,942,087 at June 30, 2021 and December 31, 2020, respectively.

Loans and Leases

Loans and Leases	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Loans and Leases	4. LOANS AND LEASES Major classes of loans and leases are as follows: June 30, 2021 December 31, 2020 Commercial, financial and agricultural: Owner-occupied commercial real estate $ 1,589,701 $ 1,622,687 Nonowner-occupied commercial real estate 4,981,226 5,017,727 Other commercial 3,657,772 4,054,418 Total commercial, financial & agricultural 10,228,699 10,694,832 Residential real estate 3,587,057 3,899,885 Construction & land development 1,929,052 1,826,349 Consumer: Bankcard 7,940 8,937 Other consumer 1,168,904 1,192,580 Less: Unearned income (33,651 ) (31,170 ) Total gross loans $ 16,888,001 $ 17,591,413 The table above does not include loans held for sale of $576,827 and $718,937 at June 30, 2021 and December 31, 2020, 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 $32,791 and $35,756 at June 30, 2021 and December 31, 2020, respectively.

Credit Quality

Credit Quality	6 Months Ended
	Jun. 30, 2021
Text Block [Abstract]
Credit Quality	5. CREDIT QUALITY Management monitors the credit quality of its loans and leases 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 and leases are reviewed on a monthly basis to identify loans and leases 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 and leases 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 and leases 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. Generally, a loan is categorized as a TDR if a concession is granted and there is deterioration in the financial condition of the borrower. The portfolio of TDR loans is monitored monthly. 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. A loan classified as a TDR will generally retain such classification until the loan is paid in full. However, a one-to-four-family In response to the coronavirus (“COVID-19”) COVID-19 COVID-19 As of June 30, 2021, United had TDRs of $47,271 as compared to $55,657 as of December 31, 2020. Of the $47,271 aggregate balance of TDRs at June 30, 2021, $32,471 was on nonaccrual, $46 was 90 days or more past due and $1,362 was 30-89 30-89 The following tables sets forth the balances of TDRs at June 30, 2021 and December 31, 2020 and the reasons for modification: Reason for modification June 30, 2021 December 31, 2020 Interest rate reduction $ 10,204 $ 10,774 Interest rate reduction and change in terms 0 2,346 Forgiveness of principal 200 214 Concession of principal and term 20 22 Transfer of asset 4,465 0 Extended maturity 5,546 4,414 Change in terms 26,836 37,887 Total $ 47,271 $ 55,657 The following table sets forth United’s troubled debt restructurings that have been restructured during the three months ended June 30, 2021 and 2020, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2021 June 30, 2020 Number of Pre- Modification Post- Number of Pre- Modification Post- Commercial real estate: Owner-occupied 0 $ 0 $ 0 18 $ 10,628 $ 10,586 Nonowner-occupied 1 5,413 5,364 6 2,259 2,248 Other commercial 1 181 181 14 3,169 3,090 Residential real estate 0 0 0 19 3,889 3,872 Construction & land development 0 0 0 9 2,562 2,557 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 3 69 36 Total 2 $ 5,594 $ 5,545 69 $ 22,576 $ 22,389 The Troubled Debt Restructurings For the Six Months Ended June 30, 2021 June 30, 2020 Number of Pre- Modification Post- Number of Pre- Modification Post- Commercial real estate: Owner-occupied 1 $ 940 $ 1,106 21 $ 18,579 $ 18,345 Nonowner-occupied 2 6,349 6,292 6 2,259 2,248 Other commercial 1 181 181 18 3,667 3,322 Residential real estate 0 0 0 19 3,889 3,872 Construction & land development 0 0 0 12 4,607 4,570 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 3 69 36 Total 4 $ 7,470 $ 7,579 79 $ 33,070 $ 32,393 The following table presents troubled debt restructurings, by class of loan, that were restructured during the twelve-month period ended June 30, 2021 and had charge-offs during the three months and six months ended June 30, 2021. The recorded investment amounts presented were as of the June 30, 2021 balance sheet date. Three Months Ended June 30, 2021 Six Months Ended June 30, 2021 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 1 0 1 0 Three Months Ended June 30, 2021 Six Months Ended June 30, 2021 Number of Recorded Number of Recorded Troubled Debt Restructurings Construction & land development 1 0 2 0 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total 2 $ 0 3 $ 0 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. The recorded investment amounts presented were as of the June 30, 2020 balance sheet date. 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 sets forth United’s age analysis of its past due loans and leases, segregated by class of loans: Age Analysis of Past Due Loans and Leases As of June 30, 2021 30-89 Days 90 Days or Total Past Current & Total Financing 90 Days or Commercial real estate: Owner-occupied $ 4,735 $ 19,849 $ 24,584 $ 1,565,117 $ 1,589,701 $ 832 Nonowner-occupied 5,753 25,720 31,473 4,949,753 4,981,226 1,876 Other commercial 38,932 13,444 52,376 3,605,396 3,657,772 1,028 Residential real estate 19,763 23,145 42,908 3,544,149 3,587,057 8,361 Construction & land development 1,637 3,386 5,023 1,924,029 1,929,052 133 Consumer: Bankcard 41 189 230 7,710 7,940 189 Other consumer 11,938 2,101 14,039 1,154,865 1,168,904 1,762 Total $ 82,799 $ 87,834 $ 170,633 $ 16,751,019 $ 16,921,652 $ 14,181 Age Analysis of Past Due Loans and Leases As of December 31, 2020 30-89 Days 90 Days or Total Past Current & Total Financing 90 Days or Commercial real estate: Owner-occupied $ 4,556 $ 28,479 $ 33,035 $ 1,589,652 $ 1,622,687 $ 0 Nonowner-occupied 6,837 29,292 36,129 4,981,598 5,017,727 1,284 Other commercial 13,796 26,274 40,070 4,014,348 4,054,418 1,001 Age Analysis of Past Due Loans and Leases As of December 31, 2020 30-89 Days 90 Days or Total Past Current & Total Financing 90 Days or Residential real estate 32,743 24,892 57,635 3,842,250 3,899,885 8,574 Construction & land development 1,919 5,885 7,804 1,818,545 1,826,349 461 Consumer: Bankcard 362 156 518 8,419 8,937 156 Other consumer 14,765 2,757 17,522 1,175,058 1,192,580 2,356 Total $ 74,978 $ 117,735 $ 192,713 $ 17,429,870 $ 17,622,583 $ 13,832 The following table sets forth United’s nonaccrual loans and leases, segregated by class of loans: At June 30, 2021 At December 31, 2020 Nonaccruals With No 90 Days or Nonaccruals With No 90 Days or Commercial Real Estate: Owner-occupied $ 19,017 $ 19,017 $ 832 $ 28,479 $ 28,479 $ 0 Nonowner-occupied 23,844 20,404 1,876 28,008 16,070 1,284 Other Commercial 12,416 9,191 1,028 25,273 13,149 1,001 Residential Real Estate 14,784 13,790 8,361 16,318 14,769 8,574 Construction 3,253 3,253 133 5,424 4,484 461 Consumer: Bankcard 0 0 189 0 0 156 Other consumer 339 339 1,762 401 401 2,356 Total $ 73,653 $ 65,994 $ 14,181 $ 103,903 $ 77,352 $ 13,832 Interest income recognized on nonaccrual loans was insignificant during the three and six months ended June 30, 2021 and 2020. For the adoption of ASC Topic 326, United elected the practical expedient to measure expected credit losses on collateral dependent loans and leases based on the difference between the loan’s amortized cost and the collateral’s fair value, adjusted for selling costs. The following table presents the amortized cost basis of collateral-dependent loans and leases in which repayment is expected to be derived substantially through the operation or sale of the collateral and where the borrower is experiencing financial difficulty, by class of loans and leases as of June 30, 2021 and December 31, 2020: Collateral Dependent Loans and Leases At June 30, 2021 Residential Business Land Commercial Other Total Commercial real estate: Owner-occupied $ 0 $ 44 $ 0 $ 17,266 $ 19,017 $ 36,327 Nonowner-occupied 12,985 0 2,096 8,931 16,922 40,934 Other commercial 0 14,966 0 0 1,634 16,600 Residential real estate 19,085 0 0 0 0 19,085 Construction & land development 0 0 5,114 0 812 5,926 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total $ 32,070 $ 15,010 $ 7,210 $ 26,197 $ 38,385 $ 118,872 Collateral Dependent Loans and Leases At December 31, 2020 Residential Business Land Commercial Other Total Commercial real estate: Owner-occupied $ 1,480 $ 138 $ 0 $ 18,097 $ 21,737 $ 41,452 Nonowner-occupied 16,400 0 2,898 10,167 18,230 47,695 Other commercial 5,424 20,429 0 258 2,345 28,456 Residential real estate 21,006 229 34 0 803 22,072 Construction & land development 39 0 17,408 0 746 18,193 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 1 1 Total $ 44,349 $ 20,796 $ 20,340 $ 28,522 $ 43,862 $ 157,869 United categorizes loans and leases into risk categories based on relevant information about the ability of borrowers to service their debt: current financial information, historical payment experience, credit documentation, underlying collateral (if any), public information and current economic trends, among other factors. 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 charged-off Based on the most recent analysis Commercial Real Estate O Term Loans Origination Year Revolving loans Revolving loans converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 97,374 $ 284,405 $ 154,354 $ 158,806 $ 178,273 $ 621,459 $ 25,214 $ 426 $ 1,520,311 Special Mention 0 0 0 2,166 734 19,044 941 0 22,885 Substandard 0 62 44 0 1,398 43,732 700 252 46,188 Doubtful 0 0 0 0 0 317 0 0 317 Total $ 97,374 $ 284,467 $ 154,398 $ 160,972 $ 180,405 $ 684,552 $ 26,855 $ 678 $ 1,589,701 YTD charge-offs 0 0 0 0 (44 ) (166 ) 0 0 (210 ) YTD recoveries 0 0 0 0 12 72 0 0 84 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ (32 ) $ (94 ) $ 0 $ 0 $ (126 ) Term Loans Origination Year Revolving loans Revolving loans converted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 280,779 $ 152,851 $ 162,027 $ 198,610 $ 282,214 $ 443,312 $ 22,303 $ 0 $ 1,542,096 Special Mention 0 1,206 3,772 754 2,013 20,792 0 453 28,990 Substandard 1,935 62 0 1,117 3,788 43,354 864 149 51,269 Doubtful 0 0 0 0 0 332 0 0 332 Total $ 282,714 $ 154,119 $ 165,799 $ 200,481 $ 288,015 $ 507,790 $ 23,167 $ 602 $ 1,622,687 YTD charge-offs 0 0 0 0 0 (2,195 ) 0 0 (2,195 ) YTD recoveries 0 0 0 0 0 795 0 0 795 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (1,400 ) $ 0 $ 0 $ (1,400 ) Commercial Real Estate – Nonowner-occupied Term Loans Origination Year Revolving loans Revolving loans converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 506,071 $ 895,827 $ 571,698 $ 508,960 $ 428,608 $ 1,663,763 $ 105,766 $ 2,078 $ 4,682,771 Special Mention 0 0 114,003 0 382 68,707 0 0 183,092 Substandard 0 735 13,814 6,995 1,124 92,695 0 0 115,363 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 506,071 $ 896,562 $ 699,515 $ 515,955 $ 430,114 $ 1,825,165 $ 105,766 $ 2,078 $ 4,981,226 YTD charge-offs 0 0 0 0 0 (3,101 ) 0 0 (3,101 ) YTD recoveries 0 0 0 0 0 303 0 0 303 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (2,798 ) $ 0 $ 0 $ (2,798 ) Term Loans Origination Year Revolving loans Revolving loans connverted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 929,001 $ 592,109 $ 596,260 $ 481,894 $ 502,417 $ 1,496,135 $ 118,404 $ 2,112 $ 4,718,332 Special Mention 0 105,104 0 391 8,902 78,591 0 0 192,988 Substandard 392 14,620 7,435 1,564 10,824 71,572 0 0 106,407 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 929,393 $ 711,833 $ 603,695 $ 483,849 $ 522,143 $ 1,646,298 $ 118,404 $ 2,112 $ 5,017,727 YTD charge-offs (38 ) 0 (300 ) 0 (3,394 ) (2,402 ) 0 0 (6,134 ) YTD recoveries 0 0 0 0 0 1,023 0 0 1,023 YTD net charge-offs $ (38 ) $ 0 $ (300 ) $ 0 $ (3,394 ) $ (1,379 ) $ 0 $ 0 $ (5,111 ) Other commercial Term Loans and leases Origination Year Revolving loans Revolving loans and leases converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 758,865 $ 898,082 $ 353,707 $ 129,477 $ 96,778 $ 112,242 $ 1,214,646 $ 2,257 $ 3,566,054 Special Mention 25 67 147 1,196 1,003 4,852 41,972 73 49,335 Substandard 8 1,047 807 2,234 455 21,876 15,532 284 42,243 Doubtful 0 0 0 0 0 140 0 0 140 Total $ 758,898 $ 899,196 $ 354,661 $ 132,907 $ 98,236 $ 139,110 $ 1,272,150 $ 2,614 $ 3,657,772 YTD charge-offs 0 0 (31 ) (100 ) (6 ) (2,447 ) (40 ) 0 (2,624 ) YTD recoveries 0 0 14 85 16 1,714 0 0 1,829 YTD net charge-offs $ 0 $ 0 $ (17 ) $ (15 ) $ 10 $ (733 ) $ (40 ) $ 0 $ (795 ) Term Loans and leases Origination Year Revolving loans Revolving loans and leases converted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 1,702,787 $ 370,059 $ 200,588 $ 112,170 $ 119,582 $ 257,638 $ 1,172,699 $ 2,668 $ 3,938,191 Special Mention 333 384 4,754 1,300 138 8,231 40,048 86 55,274 Substandard 1,649 830 2,241 2,606 6,565 30,308 16,222 360 60,781 Doubtful 0 0 0 0 37 135 0 0 172 Total $ 1,704,769 $ 371,273 $ 207,583 $ 116,076 $ 126,322 $ 296,312 $ 1,228,969 $ 3,114 $ 4,054,418 YTD charge-offs 0 0 (959 ) (23 ) (3,525 ) (12,843 ) 0 0 (17,350 ) YTD recoveries 94 864 18 12 684 2,789 0 0 4,461 YTD net charge-offs $ 94 $ 864 $ (941 ) $ (11 ) $ (2,841 ) $ (10,054 ) $ 0 $ 0 $ (12,889 ) Residential Real Estate Term Loans Origination Year Revolving loans Revolving loans converted to term loans Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 395,401 $ 628,539 $ 475,986 $ 407,397 $ 221,041 $ 1,019,262 $ 404,177 $ 3,044 $ 3,554,847 Special Mention 0 0 265 0 179 5,068 730 0 6,242 Substandard 0 0 393 424 3,196 21,571 270 114 25,968 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 395,401 $ 628,539 $ 476,644 $ 407,821 $ 224,416 $ 1,045,901 $ 405,177 $ 3,158 $ 3,587,057 YTD charge-offs 0 0 (30 ) 0 (116 ) (5,260 ) 0 0 (5,406 ) YTD recoveries 0 0 0 0 0 821 0 0 821 YTD net charge-offs $ 0 $ 0 $ (30 ) $ 0 $ (116 ) $ (4,439 ) $ 0 $ 0 $ (4,585 ) Term Loans Origination Year Revolving loans Revolving loans converted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 603,714 $ 624,142 $ 640,535 $ 292,700 $ 282,547 $ 975,913 $ 436,728 $ 4,224 $ 3,860,503 Special Mention 0 267 0 192 2,325 6,623 800 0 10,207 Substandard 0 282 440 3,263 3,516 20,967 201 227 28,896 Doubtful 0 0 0 0 0 279 0 0 279 Total $ 603,714 $ 624,691 $ 640,975 $ 296,155 $ 288,388 $ 1,003,782 $ 437,729 $ 4,451 $ 3,899,885 YTD charge-offs 0 0 0 0 (1 ) (1,759 ) 0 0 (1,760 ) YTD recoveries 0 0 0 101 0 961 1 0 1,063 YTD net charge-offs $ 0 $ 0 $ 0 $ 101 $ (1 ) $ (798 ) $ 1 $ 0 $ (697 ) Construction and Land Development Term Loans Origination Year Revolving loans Revolving loans converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 282,876 $ 507,181 $ 501,304 $ 267,413 $ 93,005 $ 86,486 $ 167,545 $ 0 $ 1,905,810 Special Mention 0 0 0 2,419 550 1,221 995 0 5,185 Substandard 386 0 278 941 0 15,706 746 0 18,057 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 283,262 $ 507,181 $ 501,582 $ 270,773 $ 93,555 $ 103,413 $ 169,286 $ 0 $ 1,929,052 YTD charge-offs 0 0 0 0 0 (255 ) 0 0 (255 ) YTD recoveries 0 0 0 0 0 48 0 0 48 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (207 ) $ 0 $ 0 $ (207 ) Term Loans Origination Year Revolving loans Revolving loans converted to Total \ 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 420,977 $ 663,113 $ 304,579 $ 127,377 $ 83,252 $ 53,713 $ 145,431 $ 0 $ 1,798,442 Special Mention 0 0 4,689 557 0 1,420 995 0 7,661 Substandard 0 250 1,535 0 216 17,499 746 0 20,246 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 420,977 $ 663,363 $ 310,803 $ 127,934 $ 83,468 $ 72,632 $ 147,172 $ 0 $ 1,826,349 YTD charge-offs 0 0 0 0 0 (2,027 ) 0 0 (2,027 ) YTD recoveries 0 0 0 0 0 1,513 0 0 1,513 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (514 ) $ 0 $ 0 $ (514 ) Bankcard Term Loans Origination Year Revolving loans Revolving loans converted to term loans Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 7,710 $ 0 $ 7,710 Special Mention 0 0 0 0 0 0 41 0 41 Substandard 0 0 0 0 0 0 189 0 189 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 7,940 $ 0 $ 7,940 YTD charge-offs 0 0 0 0 0 0 (106 ) 0 (106 ) YTD recoveries 0 0 0 0 0 0 30 0 30 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (76 ) $ 0 $ (76 ) Term Loans Origination Year Revolving loans Revolving loans converted to term loans Total As of December 31, 2020 Internal Risk Grade: Pass $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 8,419 $ 0 $ 8,419 Special Mention 0 0 0 0 0 0 362 0 362 Substandard 0 0 0 0 0 0 156 0 156 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 8,937 $ 0 $ 8,937 YTD charge-offs 0 0 0 0 0 0 (221 ) 0 (221 ) YTD recoveries 0 0 0 0 0 0 52 0 52 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (169 ) $ 0 $ (169 ) Other Consumer Term Loans Origination Year Revolving loans Revolving loans converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 241,796 $ 380,844 $ 311,882 $ 170,348 $ 48,919 $ 12,089 $ 3,017 $ 0 $ 1,168,895 Special Mention 0 0 0 0 0 6 1 0 7 Substandard 0 2 0 0 0 0 0 0 2 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 241,796 $ 380,846 $ 311,882 $ 170,348 $ 48,919 $ 12,095 $ 3,018 $ 0 $ 1,168,904 YTD charge-offs 0 (395 ) (505 ) (263 ) (80 ) (136 ) (7 ) 0 (1,386 ) YTD recoveries 0 34 25 38 8 103 2 0 210 YTD net charge-offs $ 0 $ (361 ) $ (480 ) $ (225 ) $ (72 ) $ (33 ) $ (5 ) $ 0 $ (1,176 ) Term Loans Origination Year Revolving loans Revolving loans converted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 419,768 $ 401,958 $ 231,172 $ 74,550 $ 34,435 $ 7,466 $ 6,110 $ 0 $ 1,175,459 Special Mention 0 0 0 0 0 14,763 2 0 14,765 Substandard 3 0 0 0 0 2,352 0 0 2,355 Doubtful 0 0 0 0 0 1 0 0 1 Total $ 419,771 $ 401,958 $ 231,172 $ 74,550 $ 34,435 $ 24,582 $ 6,112 $ 0 $ 1,192,580 YTD charge-offs (136 ) (1,013 ) (1,040 ) (393 ) (228 ) (484 ) (2 ) 0 (3,296 ) YTD recoveries 3 74 113 30 43 216 0 0 479 YTD net charge-offs $ (133 ) $ (939 ) $ (927 ) $ (363 ) $ (185 ) $ (268 ) $ (2 ) $ 0 $ (2,817 ) At June 30, 2021 and December 31, 2020, other real estate owned (“OREO”) included in other assets in the Consolidated Balance Sheets was $18,474 and $22,595, 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 o

Allowance for Credit Losses

Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Allowance for Credit Losses	6. ALLOWANCE FOR CREDIT LOSSES As of January 1, 2020, United adopted the CECL methodology for measuring credit losses in accordance with ASC Topic 326. Under ASC Topic 326, 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, net of an allowance for credit losses, of $48,559 The following table represents the accrued interest receivable as of June 30, 2021 and December 31, 2020: Accrued Interest Receivable At June 30, 2021 At December 31, 2020 Commercial Real Estate: Owner-occupied $ 3,823 $ 5,001 Nonowner-occupied 13,671 15,989 Other Commercial 11,678 12,320 Residential Real Estate 9,730 12,558 Construction 6,693 7,314 Consumer: Bankcard 0 0 Other consumer 2,993 3,211 $ 48,588 $ 56,393 Less: Allowance for credit losses (29 ) (250 ) Total $ 48,559 $ 56,143 The following table represents the accrued interest receivables written off by reversing interest income for the three months and six months ended June 30, 2021 and 2020 Accrued Interest Receivables Written Off by Reversing Interest Income Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 Commercial real estate: Owner-occupied $ 11 $ 83 $ 12 $ 100 Nonowner-occupied 4 38 40 45 Other commercial 2 33 8 45 Residential real estate 21 64 49 134 Construction & land development 0 0 0 0 Consumer: Bankcard 0 0 0 0 Other consumer 42 27 106 67 Total $ 80 $ 245 $ 215 $ 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 and leases 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 (PD/LGD) • 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 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, but may also include other non-performing Expected credit losses are estimated over the contractual term of the loans and leases, 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 and leases acquired through the completion of a transfer, including loans and leases 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 and leases previously accounted for as PCI meet the definition of purchased credit deteriorated (“PCD”) loans and leases upon adoption of ASC Topic 326. Any changes in the allowance for credit losses for these loans and leases were accounted for as an adjustment to the loan’s amortized cost basis and not as a cumulative-effect adjustment to an entity’s beginning retained earnings. Non-PCI non-PCD At the acquisition date, an initial allowance for expected credit losses is estimated and recorded as credit loss expense. The subsequent measurement of expected credit losses for all acquired loans is the same as the subsequent measurement of expected credit losses for originated loans. For allowance for credit losses under ASC Topic 326 calculation purposes, United includes its acquired loans and leases in their relevant pool unless they meet the criteria for specific review. United maintains an allowance for loan losses and a reserve for lending-related commitments such as unfunded loan commitments and letters of credit. The reserve for lending-related commitments of $20,897 and $19,250 at June 30, 2021 and December 31, 2020, respectively, is separately classified on the balance sheet and is included in other liabilities. The combined allowance for loan losses and reserve for lending-related commitments is considered the allowance for credit losses. As of June 30, 2021, the allowance for credit losses decreased from December 31, 2020 primarily due to better performance trends within the loan portfolio and COVID-19 The second quarter of 2021 qualitative adjustments include analyses of the following: • Past events • Current conditions COVID-19 • Reasonable and supportable forecasts portfolio-by-portfolio • The forecast improved in the second quarter of 2021 as compared to the first quarter while maintaining a gradual recovery pace extending into 2023. • Greater risk of loss is probable in the hotel and accommodations portfolio due to weakened economic conditions brought on by the pandemic which resulted in a more negative forecast relative to other portfolios and a longer projected recovery period to extend into late 2023 or 2024. • Consideration was given to the $1.9 trillion American Rescue Plan (effective March 11, 2021) during the forecast selection process as it is likely this stimulus package continues to have a positive impact on the economy. • 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, 2021 Commercial Real Estate Other Residential Construction & Land Bankcard Allowance Total Owner- Nonowner- Other Allowance for Loan Losses: Beginning balance $ 21,074 $ 47,902 $ 84,504 $ 24,991 $ 38,329 $ 271 $ 14,511 $ 0 $ 231,582 Charge-offs (67 ) (0 ) (1 ) (5,193 ) (119 ) (71 ) (680 ) 0 (6,131 ) Recoveries 78 50 482 168 4 24 104 0 910 Provision (1,782 ) (5,906 ) (5,104 ) 6,085 (3,067 ) 30 928 0 (8,816 ) Ending balance $ 19,303 $ 42,046 $ 79,881 $ 26,051 $ 35,147 $ 254 $ 14,863 $ 0 $ 217,545 For the Six Months Ended June 30, 2021 Commercial Real Estate Other Residential Construction & Land Allowance Total Owner- Nonowner- Bankcard Other Allowance for Loan Losses: Beginning balance $ 23,354 $ 49,150 $ 78,138 $ 29,125 $ 39,077 $ 322 $ 16,664 $ 0 $ 235,830 Charge-offs (210 ) (3,101 ) (2,624 ) (5,406 ) (255 ) (106 ) (1,386 ) 0 (13,088 ) Recoveries 84 303 1,829 821 48 30 210 0 3,325 Provision (3,925 ) (4,306 ) 2,538 1,511 (3,723 ) 8 (625 ) 0 (8,522 ) Ending balance $ 19,303 $ 42,046 $ 79,881 $ 26,051 $ 35,147 $ 254 $ 14,863 $ 0 $ 217,545 Allowance for Loan and Lease Losses and Carrying Amount of Loans and Leases For the Year Ended December 31, 2020 Commercial Real Estate Other Residential Construction & Land Bankcard Allowance Total Owner- Nonowner- Other Allowance for Loan and Lease 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 (2,195 ) (6,134 ) (17,350 ) (1,760 ) (2,027 ) (221 ) (3,296 ) 0 (32,983 ) Recoveries 795 1,023 4,461 1,063 1,513 52 479 0 9,386 Provision 5,665 30,175 40,561 6,902 16,806 389 5,795 0 106,293 Ending balance $ 23,354 $ 49,150 $ 78,138 $ 29,125 $ 39,077 $ 322 $ 16,664 $ 0 $ 235,830

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	7. INTANGIBLE ASSETS The following is a summary June 30, 2021 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 101,767 ($ 79,053 ) $ 0 $ 0 $ 101,767 ($ 79,053 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Crescent trade name 0 196 196 Total $ 0 $ 1,276 $ 1,276 Goodwill not subject to amortization $ 1,804,725 $ 5,315 $ 1,810,040 December 31, 2020 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 101,767 ($ 76,120 ) $ 0 $ 0 $ 101,767 ($ 76,120 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Crescent trade name 0 196 196 Total $ 0 $ 1,276 $ 1,276 Goodwill not subject to amortization $ 1,791,533 $ 5,315 $ 1,796,848 United incurred amortization expense of $1,467 and $2,933 for the three and six months ended June 30, 2021 as compared to $1,646 and $3,223 for the three and six months ended June 30, 2020, respectively. For the first six months of 2021, goodwill of $13,192 was recorded for the Carolina Financial acquisition due to adjustments in current and deferred income taxes. The following table provides a reconciliation of goodwill: Community Mortgage Total Goodwill at December 31, 2020 $ 1,791,533 $ 5,315 $ 1,796,848 Goodwill 13,192 0 13,192 Goodwill at June 30, 2021 $ 1,804,725 $ 5,315 $ 1,810,040 The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2020: Year Amount 2021 $ 5,866 2022 4,983 2023 4,680 2024 3,255 2025 2,942 2026 and thereafter 3,921

Mortgage Servicing Rights

Mortgage Servicing Rights	6 Months Ended
	Jun. 30, 2021
Servicing Asset [Abstract]
Mortgage 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 (“MSRs”) at fair value, if practicable. For subsequent measurement purposes, the Company measures servicing assets and liabilities based on the lower of cost or market using the amortization method. MSRs are amortized in proportion to, and over the period of, estimated net servicing income. The amortization of the MSRs is analyzed periodically and is adjusted to reflect changes in prepayment rates and other estimates. The Company evaluates potential impairment of MSRs based on the difference between the carrying amount and current estimated fair value of the servicing rights. In determining impairment, the Company aggregates all servicing rights and stratifies them into tranches based on predominant risk characteristics. 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 N H L N The unpaid principal balances of loans serviced for others were approximately $3,674,023 at June 30, 2021 and $3,587,953 at December 31, 2020. The estimated fair value of the mortgage servicing rights was $24,630 and $20,955 at June 30, 2021 and December 31, 2020, respectively. The estimated fair value of servicing rights at June 30, 2021 was determined using a net servicing fee of 0.26%, average discount rates ranging from 10.50% to 12.00% with a weighted average discount rate of 10.61%, average constant prepayment rates (“CPR”) ranging from 11.29% to 22.83% with a weighted average prepayment rate of 17.53%, depending upon the stratification of the specific servicing right, and a delinquency rate, including loans on forbearance of 2.76%. The estimated fair value of servicing rights at December 31, 2020 was determined using a net servicing fee of 0.26%, average discount rates ranging from 9.50% to 14.07% with a weighted average discount rate of 10.62%, average CPR ranging from 7.98% to 18.42% with a weighted average prepayment rate of 14.60%, depending upon the stratification of the specific servicing right, and a delinquency rate, including loans on forbearance of 2.88%. Please refer to Note 1 4 As disclosed in Note 2 of these Notes to Consolidated Financial Statements, the Company acquired $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, 2021 and 2020: Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 MSRs beginning balance $ 23,401 $ 0 $ 22,338 $ 0 Addition from acquisition of subsidiary 0 20,123 0 20,123 Amount capitalized 3,111 1,891 6,335 1,891 Amount amortized (2,339 ) (1,104 ) (4,500 ) (1,104 ) MSRs ending balance $ 24,173 $ 20,910 $ 24,173 $ 20,910 MSRs valuation allowance beginning balance $ (1,383 ) $ 0 $ (1,383 ) $ 0 Aggregate additions charged and recoveries credited to operations 379 0 379 0 MSRs impairment (629 ) (710 ) (629 ) (710 ) MSRs valuation allowance ending balance $ (1,633 ) $ (710 ) $ (1,633 ) $ (710 ) MSRs, net of valuation allowance $ 22,540 $ 20,200 $ 22,540 $ 20,200 In determining impairment, the Company aggregates all servicing rights and stratifies them into tranches based on predominant risk characteristics. The Company recorded a $250 temporary impairment , net of recoveries 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, 2021
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 12 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 are recognized at commencement date based on the present value of lease payments over the lease term. As most of United’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. Lease terms may include options to extend the lease when it is reasonably certain that United will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The components of lease expense were as follows: Classification Three Months Three Months Operating lease cost Net occupancy expense $ 5,328 $ 5,895 Sublease income Net occupancy expense (358 ) (189 ) Net lease cost $ 4,970 $ 5,706 Classification Six Months Ended Six Months Operating lease cost Net occupancy expense $ 10,677 $ 10,961 Sublease income Net occupancy expense (655 ) (394 ) Net lease cost $ 10,022 $ 10,567 Supplemental balance sheet information related to leases was as follows: Classifi June 30, 2021 December 31, 2020 Operating lease right-of-use Operating lease right-of-use assets $ 66,635 $ 69,520 Operating lease liabilities Operating lease liabilities $ 70,546 $ 73,213 Other information related to leases was as follows: June 30, 2021 Weighted-average remaining lease term: Operating leases 5.8 years Weighted-average discount rate: Operating leases 2.37 % Supplemental cash flow information related to leases was as follows: Three Months Ended June 30, 2021 June 30, 2020 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 5,581 $ 5,722 ROU assets obtained in the exchange for lease liabilities 1,839 8,549 Six Months Ended June 30, 2021 June 30, 2020 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 11,027 $ 10,739 ROU assets obtained in the exchange for lease liabilities 6,282 12,332 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, 2020, consists of the following as of June 30, 2021 and December 31, 2020: Amount Year As of June 30, 2021 As of December 31, 2020 2021 $ 10,221 $ 20,172 2022 17,074 16,196 2023 13,616 12,723 2024 9,096 8,242 2025 6,362 5,516 Thereafter 18,842 15,330 Total lease payments 75,211 78,179 Less: imputed interest (4,665 ) (4,966 ) Total $ 70,546 $ 73,213

Short-Term Borrowings

Short-Term Borrowings	6 Months Ended
	Jun. 30, 2021
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, 2021, United did not have any federal funds purchased while total securities sold under agreements to repurchase (“REPOs”) were $127,745. 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

Long-Term Borrowings

Long-Term Borrowings	6 Months Ended
	Jun. 30, 2021
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, 2021, United had an unused borrowing amount of approximately $7,005,031 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, 2021, $533,365 of FHLB advances with a weighted-average contractual interest rate of 0.34% and a weighted-average effective interest rate of 0.55% are scheduled to mature within the next four years. The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2021 $ 500,000 2022 22,159 2023 0 2024 0 2025 and thereafter 11,206 Total $ 533,365 At June 30, 2021, 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. At June 30, 2021 and December 31, 2020, the outstanding balance of the Debentures was $270,792 and $269,972, respectively. 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 or the subordinated notes as Tier 1 capital, but rather the Capital Securities and subordinated notes are included as a component of United’s Tier 2 capital. United can include the Capital Securities and subordinated notes in its Tier 2 capital on a permanent basis.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	6 Months Ended
	Jun. 30, 2021
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 $6,368,974 and $5,730,876 of loan commitments outstanding as of June 30, 2021 and December 31, 2020, respectively, approximately 43% of which contractually expire within one year. Included in the June 30, 2021 amount are commitments to extend credit of $597,304 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. United had $3,055 and $5,092 of commercial letters of credit outstanding as of June 30, 2021 and December 31, 2020, respectively. 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 $151,289 and $134,916 as of June 30, 2021 and December 31, 2020, 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 had a reserve of $1,209 and $1,216 as of June 30, 2021 and December 31, 2020, respectively. 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, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	13. DERIVATIVE 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. 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. During the second quarter of 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 pay-fixed 1-month 12-months 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. 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 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. 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, 2021 and December 31, 2020. Asset Derivatives June 30, 2021 December 31, 2020 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Cash Flow Hedges: Interest rate swap contracts Other assets $ 500,000 $ 16,037 Other assets $ 500,000 $ 4,378 Total Cash Flow Hedges $ 500,000 $ 16,037 $ 500,000 $ 4,378 Total derivatives designated as hedging instruments $ 500,000 $ 16,037 $ 500,000 $ 4,378 Derivatives not designated as hedging instruments Forward loan sales commitments Other assets $ 32,166 $ 546 Other assets $ 62,418 $ 1,581 TBA mortgage-backed securities Other assets 98,709 296 Other assets 0 0 Interest rate lock commitments Other assets 703,161 17,438 Other assets 973,350 38,332 Total derivatives not designated as hedging instruments $ 834,036 $ 18,280 $ 1,035,768 $ 39,913 Total asset derivatives $ 1,334,036 $ 34,317 $ 1,535,768 $ 44,291 Liability Derivatives June 30, 2021 December 31, 2020 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 Other liabilities $ 74,748 $ 4,484 Other liabilities $ 77,011 $ 6,782 Total Fair Value Hedges $ 74,748 $ 4,484 $ 77,011 $ 6,782 Total derivatives designated as hedging instruments $ 74,748 $ 4,484 $ 77,011 $ 6,782 Derivatives not designated as hedging instruments Forward loan sales commitments Other liabilities $ 60,406 $ 249 Other liabilities $ 0 $ 0 TBA mortgage-backed securities Other liabilities 684,000 1,868 789,000 6,276 Total derivatives not designated as hedging instruments $ 744,406 $ 2,117 $ 789,000 $ 6,276 Total liability derivatives $ 819,154 $ 6,601 $ 866,011 $ 13,058 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, 2021 and December 31, 2020. June 30, 2021 Derivatives in Fair Value Hedging Relationships Location in the Statement Carrying Amount of Assets/(Liabilities) Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 75,523 $ (4,484 ) $ 0 December 31, 2020 Derivatives in Fair Value Hedging Relationships Location in the Statement Carrying Amount of Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 77,810 $ (6,782 ) $ 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, 2021 and 2020 are presented as follows: Income Statement Location Three Months Ended June 30, June 30, Derivatives in hedging relationships Cash flow Hedges: Interest rate swap contracts Interest on long-term borrowings $ (363 ) $ 0 Fair Value Hedges: Interest rate swap contracts Interest and fees on loans $ (558 ) $ (277 ) Total derivatives in hedging relationships $ (921 ) $ (277 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities $ 1,706 $ (553 ) TBA mortgage-backed securities Income from Mortgage Banking Activities (19,459 ) 17,204 Interest rate lock commitments Income from Mortgage Banking Activities (8,996 ) (1,527 ) Total derivatives not designated as hedging instruments $ (26,749 ) $ 15,124 Total derivatives $ (27,670 ) $ 14,847 Income Statement Location Six Months Ended June 30, June 30, Derivatives in hedging relationships Cash flow Hedges: Interest rate swap contracts Interest on long-term borrowings $ (586 ) $ 0 Fair Value Hedges: Interest rate swap contracts Interest and fees on loans $ (793 ) $ (720 ) Total derivatives in hedging relationships $ (1,379 ) $ (720 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities $ (1,284 ) $ 207 TBA mortgage-backed securities Income from Mortgage Banking Activities 4,704 (1,771 ) Interest rate lock commitments Income from Mortgage Banking Activities (15,987 ) 12,169 Total derivatives not designated as hedging instruments $ (12,567 ) $ 10,605 Total derivatives $ (13,946 ) $ 9,885

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2021
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 in 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. ASC Topic 820 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 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 bid-ask available-for-sale 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 accumulated 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 accumulated other comprehensive income, net of tax and reclassified into earnings in the same line associated with the forecasted transaction when the forecasted transaction affects 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” 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, 2021 and December 31, 2020, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2021 Using Description Balance as of June 30, 2021 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 $ 15,147 $ 0 $ 15,147 $ 0 State and political subdivisions 614,046 0 614,046 0 Residential mortgage-backed securities Agency 985,002 0 985,002 0 Non-agency 39,603 0 39,603 0 Commercial mortgage-backed sec Agency 652,557 0 652,557 0 Asset-backed securities 489,433 0 489,433 0 Single issue trust preferred securities 17,417 0 17,417 0 Other corporate securities 463,869 5,983 457,886 0 Total available for sale securities 3,277,074 5,983 3,271,091 0 Equity securities: Financial services industry 169 169 0 0 Equity mutual funds (1) 5,445 5,445 0 0 Other equity securities 5,893 5,893 0 0 Total equity securities 11,507 11,507 0 0 Loans held for sale 576,827 0 44,553 532,274 Fair Value at June 30, 2021 Using Description Balance as of June 30, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Derivative financial assets: Interest rate swap contracts 16,037 0 16,037 0 Forward sales commitments 546 0 546 0 TBA mortgage-backed securities 296 0 0 296 Interest rate lock commitments 17,438 0 2,888 14,550 Total derivative financial assets 34,317 0 19,471 14,846 Liabilities Derivative financial liabilities: Interest rate swap contracts 4,484 0 4,484 0 Forward sales commitments 249 0 0 249 TBA mortgage-backed securities 1,868 0 124 1,744 Total derivative financial liabilities 6,601 0 4,608 1,993 (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, 2020 Using Description Balance as of December 31, 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 $ 66,344 $ 0 $ 66,344 $ 0 State and political subdivisions 565,160 0 565,160 0 Residential mortgage-backed securities Agency 928,891 0 928,891 0 Non-agency 21,776 0 21,776 0 Commercial mortgage-backed securities Agency 675,145 0 675,145 0 Asset-backed securities 294,623 0 294,623 0 Single issue trust preferred securities 17,027 0 17,027 0 Other corporate securities 384,393 6,207 378,186 0 Total available for sale securities 2,953,359 6,207 2,947,152 0 Equity securities: Financial services industry 134 134 0 0 Equity mutual funds (1) 4,602 4,602 0 0 Other equity securities 5,982 5,982 0 0 Total equity securities 10,718 10,718 0 0 Loans held for sale 698,341 0 43,608 654,733 Derivative financial assets: Interest rate swap contracts 4,378 0 4,378 0 Forward sales commitments 1,581 0 1,581 0 TBA mortgage-backed securities 0 0 0 0 Interest rate lock commitments 38,332 0 6,321 32,011 Total derivative financial assets 44,291 0 12,280 32,011 Liabilities Derivative financial liabilities: Interest rate swap contracts 6,782 0 6,782 0 TBA mortgage-backed securities 6,276 0 6,276 0 Total derivative financial liabilities 13,058 0 13,058 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, 2021 and the year ended December 31, 2020. The following table presents additional information about financial assets and liabilities measured at fair value at June 30, 2021 and December 31, 2020 on a recurring basis and for which United has utilized Level 3 inputs to determine fair value: Loans held for sale June 30, 2021 December 31, Balance, beginning of period $ 654,733 $ 384,375 Originations 2,888,337 5,699,581 Sales (3,090,988 ) (5,652,693 ) Total gains or losses during the period recognized in earnings 80,192 223,470 Transfers in and/or out of Level 3 (0 ) (0 ) Balance, end of period $ 532,274 $ 654,733 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 TBA Securities June 30, 2021 December 31, Balance, beginning of period $ 0 $ 0 Transfers other 296 0 Balance, end of period $ 296 $ 0 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, 2021 December 31, Balance, beginning of period $ 32,011 $ 4,518 Transfers other (17,461 ) 27,493 Balance, end of period $ 14,550 $ 32,011 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 Liabilities Forward Sales Commitments June 30, 2021 December 31, 2020 Balance, beginning of period $ 0 $ 0 Transfers other 249 0 Balance, end of period $ 249 $ 0 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 Liabilities TBA Securities June 30, 2021 December 31, Balance, beginning of period $ 0 $ 0 Transfers other 1,744 0 Balance, end of period $ 1,744 $ 0 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 Option As of January 1, 2021, United elected the fair value option for new loans held for sale originated in its community banking segment after that date to mitigate a divergence between accounting losses and economic exposure. Prior to January 1, 2021, United elected the fair value option only for its loans held for sale in its mortgage banking segment . 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, 2021 Three Months Ended June 30, 2020 Income from mortgage banking activities $ 6,075 $ 8,846 Description Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Income from mortgage banking activities $ (11,776 ) $ 10,471 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, 2021 December 31, 2020 Description Unpaid Fair Fair Value Unpaid Fair Fair Value Loans held for sale $ 562,200 $ 576,827 $ 14,627 $ 672,458 $ 698,341 $ 25,883 Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis 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 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 OREO bi-annual Intangible Assets more-likely-than-not economic uncertainty and volatility surrounding COVID-19 Mortgage Servicing Rights ( “ MSRs ” ): The Company recorded a temporary impairment , net of recoveries of $250 on mortgage servicing rights in the quarter and six months ended June 30, 2021. The Company recorded a $710 temporary impairment of mortgage servicing rights in the quarter and six months 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 in 2020. The following table summarizes United’s financial assets that were measured at fair value on a nonrecurring basis during the period: Description Balance as of June 30, 2021 Carrying value at June 30, 2021 YTD Gains (Losses) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Individually assessed loans $ 17,893 $ 0 $ 13,591 $ 4,302 $ (1,430 ) OREO 18,474 0 18,474 0 (3,528 ) Mortgage servicing rights 24,630 0 0 24,630 (250 ) Description Balance as of December 31, 2020 Carrying value at December 31, 2020 YTD Gains (Losses) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Loans held for sale $ 20,596 $ 0 $ 20,596 $ 0 $ (197 ) Individually assessed loans 37,498 0 14,467 23,031 1,318 OREO 22,595 0 22,595 0 (1,618 ) Mortgage servicing rights 20,955 0 0 20,955 (1,383 ) 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 and leases 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 Amount 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, 2021 Cash and cash equivalents $ 3,677,396 $ 3,677,396 $ 0 $ 3,677,396 $ 0 Securities available for sale 3,277,074 3,277,074 5,983 3,271,091 0 Securities held to maturity 989 1,020 0 0 1,020 Equity securities 11,507 11,507 11,507 0 0 Other securities 221,931 210,834 0 0 210,834 Loans held for sale 576,827 576,827 0 44,553 532,274 Net loans 16,670,456 16,153,015 0 0 16,153,015 Derivative financial assets 34,317 34,317 0 19,471 14,846 Mortgage servicing rights 22,540 24,630 0 0 24,630 Deposits 21,567,391 21,555,714 0 21,555,714 0 Short-term borrowings 127,745 127,745 0 127,745 0 Long-term borrowings 814,022 768,278 0 768,278 0 Derivative financial liabilities 6,601 6,601 0 4,608 1,993 December 31, 2020 Cash and cash equivalents $ 2,209,068 $ 2,209,068 $ 0 $ 2,209,068 $ 0 Securities available for sale 2,953,359 2,953,359 6,207 2,947,152 0 Securities held to maturity 1,212 1,235 0 215 1,020 Equity securities 10,718 10,718 10,718 0 0 Other securities 220,895 209,850 0 0 209,850 Loans held for sale 718,937 718,937 0 64,204 654,733 Net loans 17,355,583 16,559,797 0 0 16,559,797 Derivative financial assets 44,291 44,291 0 12,280 32,011 Mortgage servicing rights 20,955 20,955 0 0 20,955 Deposits 20,585,160 20,583,607 0 20,583,607 0 Short-term borrowings 142,300 142,300 0 142,300 0 Long-term borrowings 864,369 815,991 0 815,991 0 Derivative financial liabilities 13,058 13,058 0 13,058 0

Stock Based Compensation

Stock Based Compensation	6 Months Ended
	Jun. 30, 2021
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 13, 2020. An award granted under the 2020 LTI Plan may consist of any non-qualified non-employee non-employee 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 and to recoup gains realized from previous awards should United be required to prepare an accounting restatement due to materially inaccurate performance metrics. A Form S-8 2020 Compensation expense of $1,892 and $3,580 related to the nonvested awards under United’s Long-Term Incentive Plans was incurred for the second quarter and first six months of 2021, respectively, as compared to the compensation expense of $1,369 and $2,622 related to the nonvested awards under United’s Long-Term Incentive Plans incurred for the second quarter and first six months of 2020, 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, 2021, and the changes during the first six months of 2021 are presented below: Six Months Ended June 30, 2021 Weighted Average Shares Aggregate Intrinsic Value Remaining Contractual Term (Yrs.) Exercise Price Outstanding at January 1, 2021 1,904,557 $ 34.14 Granted 49,978 32.51 Exercised (173,945 ) 28.65 Forfeited or expired (110,229 ) 28.69 Outstanding at June 30, 2021 1,670,361 $ 5,358 5.3 $ 35.02 Exercisable at June 30, 2021 1,315,307 $ 4,654 4.8 $ 34.91 The following table summarizes the status of United’s nonvested stock option awards during the first six months of 2021: Shares Weighted-Average Grant Date Fair Value Per Share Nonvested at January 1, 2021 544,905 $ 6.93 Granted 49,978 5.65 Vested (239,659 ) 7.32 Forfeited or expired (170 ) 5.65 Nonvested at June 30, 2021 355,054 $ 6.49 During the six months ended June 30, 2021 and 2020, 173,945 and 14,994 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, 2021 and 2020 were issued from authorized and unissued stock. The total intrinsic value of options exercised under the Plans during the six months ended June 30, 2021 and 2020 was $1,644 and $249 respectively. Restricted Stock Under the 2020 LTI Plan, United may award restricted common shares to key employees and non-employee no sooner than 1/3 per year Unless determined by the Committee or the Board and provided in the award agreement, recipients of restricted shares do not pay any consideration to United for the shares, have the right to vote all shares subject to such grant and receive all dividends with respect to such shares, whether or not the shares have vested. Presently, these nonvested participating securities have an immaterial impact on diluted earnings per share. The following summarizes the changes to United’s nonvested restricted common shares for the period ended June 30, 2021: Shares Weighted-Average Nonvested at January 1, 2021 340,976 $ 35.41 Granted 182,344 35.97 Vested (129,061 ) 36.90 Forfeited (1,971 ) 36.70 Nonvested at June 30, 2021 392,288 $ 35.18 Restricted Stock Units Under the 2020 LTI Plan, United may grant restricted stock units (“RSUs”) to key employees. These awards help align the interests of these employees with the interests of the shareholders of United by providing economic value directly related to the performance of the Company. These RSU grants could be time-vested RSUs, performance-vested RSUs, or a combination of both. Currently, time-vested RSUs vest ratably over three years from the date of grant. Performance-vested RSUs cliff-vest after assessment of the Company’s performance over a period of three years. The number of performance-vested RSUs that vest is determined by two metrics measured relative to peers: Return on Average Tangible Common Equity (“ROATCE”) and Total Shareholder Return (“TSR”). Based on ASC Topic 718, the ROATCE comparison is considered a performance condition while the TSR comparison is considered a market condition. There will be no payout of the performance-vested awards if the threshold performance is not achieved. United communicates the specific threshold, target, and maximum performance-vested RSU awards and performance targets to the applicable key employees at the beginning of a performance period. Dividends are accrued but not paid in respect to the awards until the RSUs vest. The holder does not have the right to vote the shares during the time and performance periods. The value of the time-vested RSUs and the performance-vested, based on the performance condition, RSUs awarded is established as the fair market value of the stock at the time of the grant. The value of the performance-vested, based on the market condition, RSUs awarded is estimated through the use of a Monte Carlo valuation model as of the grant date. The Company recognizes expense on the RSUs in accordance with ASC Topic 718. The following table summarizes the status of United’s nonvested RSUs during the first six months of 2021: Shares Weighted-Average Nonvested at January 1, 2021 0 $ 0.00 Granted 136,896 35.65 Vested 0 0.00 Forfeited or expired 0 0.00 Nonvested at June 30, 2021 136,896 $ 35.65

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2021
Retirement Benefits [Abstract]
Employee Benefit Plans	16. EMPLOYEE BENEFIT PLANS United has a defined benefit retirement plan covering qualified employees hired prior to October 1, 2007. 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 2021 and 2020. Included in accumulated other comprehensive income at December 31, 2020 are unrecognized actuarial losses of $65,426 ($50,182 net of tax) that have not yet been recognized in net periodic pension cost. Net periodic pension cost for the three and six months ended June 30, 2021 and 2020 included the following components: Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 Service cost $ 758 $ 715 $ 1,508 $ 1,430 Interest cost 1,031 1,286 2,051 2,573 Expected return on plan assets (2,957 ) (2,630 ) (5,881 ) (5,259 ) Recognized net actuarial loss 1,589 1,442 3,161 2,884 Net periodic pension cost $ 421 $ 813 $ 839 $ 1,628 Weighted-average assumptions: Discount rate 2.81 % 3.42 % 2.81 % 3.42 % Expected return on assets 6.25 % 6.75 % 6.25 % 6.75 % Rate of compensation increase (prior to age 40) 5.00 % 5.00 % 5.00 % 5.00 % Rate of compensation increase (ages 40-54) 4.00 % 4.00 % 4.00 % 4.00 % Rate of compensation increase (otherwise) 3.50 % 3.50 % 3.50 % 3.50 %

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	17. INCOME United records a liability for uncertain income tax positions based on a recognition threshold of more-likely-than-not, As of June 30, 2021 and 2020, the total amount of accrued interest related to uncertain tax positions was $722 and $718, 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, 2017, 2018 and 2019 and certain State Taxing authorities for the years ended December 31, 2017 through 2019. United’s effective tax rate was 20.50% for both the second quarter and first six months of 2021 and 17.30% and 18.38% for the second quarter and first six months of 2020.

Comprehensive Income

Comprehensive Income	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Comprehensive Income	18. COMPREHENSIVE INCOME The components of total comprehensive income for the three and six months ended June 30, 2021 and 2020 are as follows: Three Months Ended Six Months Ended 2021 2020 2021 2020 Net Income $ 94,836 $ 52,686 $ 201,734 $ 92,869 Available for sale (“AFS”) securities: Change in net unrealized gain on AFS securities arising during the period 18,040 37,756 (27,927 ) 60,859 Related income tax effect (4,203 ) (8,797 ) 6,507 (14,180 ) Net reclassification adjustment for gains included in net income (0 ) (1,466 ) (1,444 ) (1,641 ) Related income tax expense 0 341 336 382 Net effect of AFS securities on other comprehensive income 13,837 27,834 (22,528 ) 45,420 Cash flow hedge derivatives: Unrealized gain on cash flow hedge before reclassification to interest expense (8,243 ) (1,659 ) 11,074 (1,659 ) Related income tax effect 1,921 387 (2,580 ) 387 Net reclassification adjustment for losses included in net income 363 0 586 0 Related income tax effect (85 ) 0 (137 ) 0 Net effect of cash flow hedge derivatives on other comprehensive income (6,044 ) (1,272 ) 8,943 (1,272 ) Three Months Ended Six Months Ended June 30 2021 2020 2021 2020 Pension plan: Recognized net actuarial loss 1,589 1,442 3,161 2,884 Related income tax benefit (720 ) (329 ) (1,423 ) (659 ) Net effect of change in pension plan asset on other comprehensive income 869 1,113 1,738 2,225 Total change in other comprehensive income 8,662 27,675 (11,847 ) 46,373 Total Comprehensive Income $ 103,498 $ 80,361 $ 189,887 $ 139,242 The components of accumulated other comprehensive income for the six months ended June 30, 2021 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2021 Unrealized Unrealized Defined Items Total Balance at January 1, 2021 $ 65,205 $ 3,358 $ (46,193 ) $ 22,370 Other comprehensive income before reclassification (21,420 ) 8,494 0 (12,926 ) Amounts reclassified from accumulated other comprehensive income (1,108 ) 449 1,738 1,079 Net current-period other comprehensive income, net of tax (22,528 ) 8,943 1,738 (11,847 ) Balance at June 30, 2021 $ 42,677 $ 12,301 $ (44,455 ) $ 10,523 (a) All amounts are net-of-tax. Reclassifications out of Accumulated Other Comprehensive Income (AOCI) For the Six Months Ended June 30, 2021 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 gains included in net income $ (1,444 ) Net investment securities gains (1,444 ) Total before tax Related income tax effect 336 Tax expense (1,108 ) Net of tax Cash flow hedge: Net reclassification adjustment for losses included in net income $ 586 Interest expense 586 Total before tax Related income tax effect (137 ) Tax expense 449 Net of tax Pension plan: Recognized net actuarial loss 3,161 (a) 3,161 Total before tax Related income tax effect (1,423 ) Tax expense 1,738 Net of tax Total reclassifications for the period $ 1,079 (a) This AOCI component is included in the computation of changes in plan assets (see Note 16, Employee Benefit Plans)

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2021
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 2021 2020 2021 2020 Distributed earnings allocated to common stock $ 45,085 $ 45,298 $ 90,153 $ 80,785 Undistributed earnings allocated to common stock 49,478 7,262 111,007 11,840 Net earnings allocated to common shareholders $ 94,563 $ 52,560 $ 201,160 $ 92,625 Average common shares outstanding 128,750,851 119,823,652 128,693,616 110,559,363 Equivalents from stock options 283,137 64,171 252,664 65,613 Average diluted shares outstanding 129,033,988 119,887,823 128,946,280 110,624,976 Earnings per basic common share $ 0.73 $ 0.44 $ 1.56 $ 0.84 Earnings per diluted common share $ 0.73 $ 0.44 $ 1.56 $ 0.84 Antidilutive stock options and restricted stock outstanding of 468,892 and 978,095 for the three months and six months ended June 30, 2021, respectively, were excluded from the earnings per diluted common share calculation as compared to 2,027,073 and 1,700,493 for the three months and six months ended June 30, 2020, respectively.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2021
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 Capital Securities Issued Stated Interest Rate Maturity Date United Statutory Trust III December 17, 2003 $ 20,000 3-month LIBOR + 2.85% 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 LIBOR + 3.10% 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 The following table summarizes quantitative information about United’s significant involvement in unconsolidated VIEs: As of June 30, 2021 As of December 31, 2020 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 295,246 $ 284,503 $ 10,743 $ 295,466 $ 284,788 $ 10,678 (1) Represents investment in VIEs.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2021
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. Crescent 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 and The community banking segment provides the mortgage banking segment (George Mason and Crescent) 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, 2021 and 2020 is as follows: At and For the Three Months Ended June 30, 2021 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 183,400 $ 2,871 $ (2,106 ) $ 2,352 $ 186,517 Provision for credit (8,879 ) 0 0 0 (8,879 ) Other income 24,072 39,765 1,132 (2,123 ) 62,846 Other expense 103,429 36,391 (1,098 ) 229 138,951 Income taxes 23,149 1,280 26 0 24,455 Net income (loss) $ 89,773 $ 4,965 $ 98 $ 0 $ 94,836 Total assets (liabilities) $ 26,831,380 $ 720,912 $ 32,619 $ (393,985 ) $ 27,190,926 Average assets (liabilities) 26,661,453 729,114 26,090 (410,699 ) 27,005,958 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 credit 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 Six Months Ended June 30, 2021 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 370,597 $ 5,521 $ (4,244 ) $ 5,603 $ 377,477 Provision for credit (8,736 ) 0 0 0 (8,736 ) Other income 50,460 107,272 2,653 (4,966 ) 155,419 Other expense 213,446 77,574 (3,779 ) 637 287,878 Income taxes 44,351 7,220 449 0 52,020 Net income (loss) $ 171,996 $ 27,999 $ 1,739 $ 0 $ 201,734 Total assets (liabilities) $ 26,831,380 $ 720,912 $ 32,619 $ (393,985 ) $ 27,190,926 Average assets (liabilities) 26,409,142 722,997 24,709 (406,747 ) 26,750,101 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 credit 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

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
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.
New Accounting Standards	New Accounting Standards In January 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2021-01, No. 2021-01 No. 2021-01 In August 2020, the FASB issued ASU No. 2020-06, 470-20) 815-40).” earnings-per-share No. 2020-06 No. 2020-06 In March 2020, the FASB issued ASU No. 2020-04, No. 2020-04 No. 2020-04 In January 2020, the FASB issued ASU No. 2020-01, No. 2020-01 No. 2020-01 In August 2018, the FASB issued ASU No. 2018-14 - 715-20): – No. 2018-14 No. 2018-14

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2021
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 PCD loans and leases acquired from Carolina Financial as of the Acquisition Date: Purchase price of PCD loans and leases at acquisition $ 1,023,531 Allowance for credit losses at acquisition 18,635 Non-credit 7,212 Par value (UPB) of acquired PCD loans and leases at acquisition $ 1,049,378
Summary of Business Acquisitions, by Acquisition	The consideration paid for Carolina Financial’s common equity and the amounts of acquired identifiable assets and liabilities assumed as of the 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 580,791 Loans held for sale 65,757 Net loans and leases 3,246,940 Premises and equipment 79,127 Operating lease right-of-use 9,861 Crescent trade name intangible 196 Core deposit intangible 3,408 Mortgage servicing rights 20,123 Other assets 159,218 Total identifiable assets $ 4,794,575 Identifiable liabilities: Deposits $ 3,884,977 Short-term borrowings 332,000 Long-term borrowings 42,738 Operating lease liability 9,861 Other liabilities 39,148 Total identifiable liabilities 4,308,724 Fair value of net assets acquired including identifiable intangible assets 485,851 Resulting goodwill $ 332,026

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2021
Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities	The amortized cost, estimated fair values, and allowance for credit losses of securities available for sale are summarized as follows. June 30, 2021 Amortized Gross Gross Allowance Estimated Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 14,908 $ 242 $ 3 $ 0 $ 15,147 State and political subdivisions 592,778 22,585 1,317 0 614,046 Residential mortgage-backed securities Agency 973,328 17,216 5,542 0 985,002 Non-agency 39,792 15 204 0 39,603 Commercial mortgage-backed securities Agency 634,647 21,212 3,302 0 652,557 Asset-backed securities 489,901 714 1,182 0 489,433 Single issue trust preferred securities 18,249 188 1,020 0 17,417 Other corporate securities 457,829 6,183 143 0 463,869 Total $ 3,221,432 $ 68,355 $ 12,713 $ 0 $ 3,277,074 December 31, 2020 Amortized Gross Gross Allowance Estimated Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 65,804 $ 543 $ 3 $ 0 $ 66,344 State and political subdivisions 538,082 27,330 252 0 565,160 Residential mortgage-backed securities Agency 905,230 24,134 473 0 928,891 Non-agency 21,639 137 0 0 21,776 Commercial mortgage-backed securities Agency 644,774 31,009 638 0 675,145 Asset-backed securities 297,834 204 3,415 0 294,623 Single issue trust preferred securities 18,230 167 1,370 0 17,027 Other corporate securities 376,753 7,648 8 0 384,393 Total $ 2,868,346 $ 91,172 $ 6,159 $ 0 $ 2,953,359
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, 2021 and December 31, 2020. Less than 12 months 12 months or longer Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized June 30, 2021 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 252 $ 3 $ 252 $ 3 State and political subdivisions 63,639 1,254 4,920 63 68,559 1,317 Residential mortgage-backed securities Agency 393,743 5,542 0 0 393,743 5,542 Non-agency 20,261 204 0 0 20,261 204 Commercial mortgage-backed securities Agency 117,331 3,302 0 0 117,331 3,302 Asset-backed securities 143,276 272 145,807 910 289,083 1,182 Trust preferred collateralized debt obligations 0 0 0 0 0 0 Single issue trust preferred securities 0 0 13,188 1,020 13,188 1,020 Other corporate securities 47,259 143 0 0 47,259 143 Total $ 785,509 $ 10,717 $ 164,167 $ 1,996 $ 949,676 $ 12,713 Less than 12 months 12 months or longer Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized December 31, 2020 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 297 $ 3 $ 0 $ 0 $ 297 $ 3 State and political subdivisions 30,480 252 0 0 30,480 252 Residential mortgage-backed securities Agency 131,114 467 3,867 6 134,981 473 Non-agency 0 0 0 0 0 0 Commercial mortgage-backed securities Agency 83,395 638 0 0 83,395 638 Asset-backed securities 0 0 266,104 3,415 266,104 3,415 Trust preferred collateralized debt obligations 0 0 0 0 0 0 Single issue trust preferred securities 0 0 13,804 1,370 13,804 1,370 Other corporate securities 8,494 8 0 0 8,494 8 Total $ 253,780 $ 1,368 $ 283,775 $ 4,791 $ 537,555 $ 6,159
Summary of Gains or Losses on Proceeds from Maturities, Sales and Calls of Available for Sale Securities by Specific Identification Method	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. Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 Proceeds from sales and calls $ 131,464 $ 280,780 $ 400,993 $ 413,706 Gross realized gains 0 1,565 1,542 1,818 Gross realized losses 0 98 98 177
Summary of Equity Securities	The fair value of United’s equity securities was $11,507 at June 30, 2021 and $10,718 at December 31, 2020. Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 Net gains recognized during the period $ 24 $ 43 $ 734 $ 65 Net gains recognized during the period on equity securities sold 0 1 788 7 Unrealized gains recognized during the period on equity securities still held at period end 24 43 51 114 Unrealized losses recognized during the period on equity securities still held at period end 0 (1 ) (105 ) (56 )
Available-for-sale Securities [Member]
Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value	June 30, 2021 December 31, 2020 Amortized Estimated Value Amortized Estimated Value Due in one year or less $ 72,479 $ 72,978 $ 150,575 $ 151,651 Due after one year through five years 596,359 611,994 495,922 514,441 Due after five years through ten years 688,537 702,870 688,264 714,416 Due after ten years 1,864,057 1,889,232 1,533,585 1,572,851 Total $ 3,221,432 $ 3,277,074 $ 2,868,346 $ 2,953,359

Loans and Leases (Tables)

Loans and Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Major Classes of Loans And Leases	Major classes of loans and leases are as follows: June 30, 2021 December 31, 2020 Commercial, financial and agricultural: Owner-occupied commercial real estate $ 1,589,701 $ 1,622,687 Nonowner-occupied commercial real estate 4,981,226 5,017,727 Other commercial 3,657,772 4,054,418 Total commercial, financial & agricultural 10,228,699 10,694,832 Residential real estate 3,587,057 3,899,885 Construction & land development 1,929,052 1,826,349 Consumer: Bankcard 7,940 8,937 Other consumer 1,168,904 1,192,580 Less: Unearned income (33,651 ) (31,170 ) Total gross loans $ 16,888,001 $ 17,591,413

Credit Quality (Tables)

Credit Quality (Tables)	6 Months Ended
	Jun. 30, 2021
Text Block [Abstract]
Schedule of Reasons For Modification Troubled Debt Restructuring Loans	The following tables sets forth the balances of TDRs at June 30, 2021 and December 31, 2020 and the reasons for modification: Reason for modification June 30, 2021 December 31, 2020 Interest rate reduction $ 10,204 $ 10,774 Interest rate reduction and change in terms 0 2,346 Forgiveness of principal 200 214 Concession of principal and term 20 22 Transfer of asset 4,465 0 Extended maturity 5,546 4,414 Change in terms 26,836 37,887 Total $ 47,271 $ 55,657
Schedule of Troubled Debt Restructurings, Segregated by Class of Loans and Leases	The following table sets forth United’s troubled debt restructurings that have been restructured during the three months ended June 30, 2021 and 2020, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2021 June 30, 2020 Number of Pre- Modification Post- Number of Pre- Modification Post- Commercial real estate: Owner-occupied 0 $ 0 $ 0 18 $ 10,628 $ 10,586 Nonowner-occupied 1 5,413 5,364 6 2,259 2,248 Other commercial 1 181 181 14 3,169 3,090 Residential real estate 0 0 0 19 3,889 3,872 Construction & land development 0 0 0 9 2,562 2,557 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 3 69 36 Total 2 $ 5,594 $ 5,545 69 $ 22,576 $ 22,389 The Troubled Debt Restructurings For the Six Months Ended June 30, 2021 June 30, 2020 Number of Pre- Modification Post- Number of Pre- Modification Post- Commercial real estate: Owner-occupied 1 $ 940 $ 1,106 21 $ 18,579 $ 18,345 Nonowner-occupied 2 6,349 6,292 6 2,259 2,248 Other commercial 1 181 181 18 3,667 3,322 Residential real estate 0 0 0 19 3,889 3,872 Construction & land development 0 0 0 12 4,607 4,570 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 3 69 36 Total 4 $ 7,470 $ 7,579 79 $ 33,070 $ 32,393
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, 2021 and had charge-offs during the three months and six months ended June 30, 2021. The recorded investment amounts presented were as of the June 30, 2021 balance sheet date. Three Months Ended June 30, 2021 Six Months Ended June 30, 2021 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 1 0 1 0 Three Months Ended June 30, 2021 Six Months Ended June 30, 2021 Number of Recorded Number of Recorded Troubled Debt Restructurings Construction & land development 1 0 2 0 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total 2 $ 0 3 $ 0 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. The recorded investment amounts presented were as of the June 30, 2020 balance sheet date. 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
Schedule of Age Analysis of Past Due Loans and Leases, Segregated by Class of Loans and Leases	The following table sets forth United’s age analysis of its past due loans and leases, segregated by class of loans: Age Analysis of Past Due Loans and Leases As of June 30, 2021 30-89 Days 90 Days or Total Past Current & Total Financing 90 Days or Commercial real estate: Owner-occupied $ 4,735 $ 19,849 $ 24,584 $ 1,565,117 $ 1,589,701 $ 832 Nonowner-occupied 5,753 25,720 31,473 4,949,753 4,981,226 1,876 Other commercial 38,932 13,444 52,376 3,605,396 3,657,772 1,028 Residential real estate 19,763 23,145 42,908 3,544,149 3,587,057 8,361 Construction & land development 1,637 3,386 5,023 1,924,029 1,929,052 133 Consumer: Bankcard 41 189 230 7,710 7,940 189 Other consumer 11,938 2,101 14,039 1,154,865 1,168,904 1,762 Total $ 82,799 $ 87,834 $ 170,633 $ 16,751,019 $ 16,921,652 $ 14,181 Age Analysis of Past Due Loans and Leases As of December 31, 2020 30-89 Days 90 Days or Total Past Current & Total Financing 90 Days or Commercial real estate: Owner-occupied $ 4,556 $ 28,479 $ 33,035 $ 1,589,652 $ 1,622,687 $ 0 Nonowner-occupied 6,837 29,292 36,129 4,981,598 5,017,727 1,284 Other commercial 13,796 26,274 40,070 4,014,348 4,054,418 1,001 Age Analysis of Past Due Loans and Leases As of December 31, 2020 30-89 Days 90 Days or Total Past Current & Total Financing 90 Days or Residential real estate 32,743 24,892 57,635 3,842,250 3,899,885 8,574 Construction & land development 1,919 5,885 7,804 1,818,545 1,826,349 461 Consumer: Bankcard 362 156 518 8,419 8,937 156 Other consumer 14,765 2,757 17,522 1,175,058 1,192,580 2,356 Total $ 74,978 $ 117,735 $ 192,713 $ 17,429,870 $ 17,622,583 $ 13,832
Schedule of Nonaccrual Loans and Leases, Segregated by Class of Loans and Leases	The following table sets forth United’s nonaccrual loans and leases, segregated by class of loans: At June 30, 2021 At December 31, 2020 Nonaccruals With No 90 Days or Nonaccruals With No 90 Days or Commercial Real Estate: Owner-occupied $ 19,017 $ 19,017 $ 832 $ 28,479 $ 28,479 $ 0 Nonowner-occupied 23,844 20,404 1,876 28,008 16,070 1,284 Other Commercial 12,416 9,191 1,028 25,273 13,149 1,001 Residential Real Estate 14,784 13,790 8,361 16,318 14,769 8,574 Construction 3,253 3,253 133 5,424 4,484 461 Consumer: Bankcard 0 0 189 0 0 156 Other consumer 339 339 1,762 401 401 2,356 Total $ 73,653 $ 65,994 $ 14,181 $ 103,903 $ 77,352 $ 13,832
Schedule of Collateral Dependent Loans and Leases	For the adoption of ASC Topic 326, United elected the practical expedient to measure expected credit losses on collateral dependent loans and leases based on the difference between the loan’s amortized cost and the collateral’s fair value, adjusted for selling costs. The following table presents the amortized cost basis of collateral-dependent loans and leases in which repayment is expected to be derived substantially through the operation or sale of the collateral and where the borrower is experiencing financial difficulty, by class of loans and leases as of June 30, 2021 and December 31, 2020: Collateral Dependent Loans and Leases At June 30, 2021 Residential Business Land Commercial Other Total Commercial real estate: Owner-occupied $ 0 $ 44 $ 0 $ 17,266 $ 19,017 $ 36,327 Nonowner-occupied 12,985 0 2,096 8,931 16,922 40,934 Other commercial 0 14,966 0 0 1,634 16,600 Residential real estate 19,085 0 0 0 0 19,085 Construction & land development 0 0 5,114 0 812 5,926 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total $ 32,070 $ 15,010 $ 7,210 $ 26,197 $ 38,385 $ 118,872 Collateral Dependent Loans and Leases At December 31, 2020 Residential Business Land Commercial Other Total Commercial real estate: Owner-occupied $ 1,480 $ 138 $ 0 $ 18,097 $ 21,737 $ 41,452 Nonowner-occupied 16,400 0 2,898 10,167 18,230 47,695 Other commercial 5,424 20,429 0 258 2,345 28,456 Residential real estate 21,006 229 34 0 803 22,072 Construction & land development 39 0 17,408 0 746 18,193 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 1 1 Total $ 44,349 $ 20,796 $ 20,340 $ 28,522 $ 43,862 $ 157,869
Schedule Of Term Loans And Financing Receivable	Commercial Real Estate O Term Loans Origination Year Revolving loans Revolving loans converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 97,374 $ 284,405 $ 154,354 $ 158,806 $ 178,273 $ 621,459 $ 25,214 $ 426 $ 1,520,311 Special Mention 0 0 0 2,166 734 19,044 941 0 22,885 Substandard 0 62 44 0 1,398 43,732 700 252 46,188 Doubtful 0 0 0 0 0 317 0 0 317 Total $ 97,374 $ 284,467 $ 154,398 $ 160,972 $ 180,405 $ 684,552 $ 26,855 $ 678 $ 1,589,701 YTD charge-offs 0 0 0 0 (44 ) (166 ) 0 0 (210 ) YTD recoveries 0 0 0 0 12 72 0 0 84 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ (32 ) $ (94 ) $ 0 $ 0 $ (126 ) Term Loans Origination Year Revolving loans Revolving loans converted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 280,779 $ 152,851 $ 162,027 $ 198,610 $ 282,214 $ 443,312 $ 22,303 $ 0 $ 1,542,096 Special Mention 0 1,206 3,772 754 2,013 20,792 0 453 28,990 Substandard 1,935 62 0 1,117 3,788 43,354 864 149 51,269 Doubtful 0 0 0 0 0 332 0 0 332 Total $ 282,714 $ 154,119 $ 165,799 $ 200,481 $ 288,015 $ 507,790 $ 23,167 $ 602 $ 1,622,687 YTD charge-offs 0 0 0 0 0 (2,195 ) 0 0 (2,195 ) YTD recoveries 0 0 0 0 0 795 0 0 795 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (1,400 ) $ 0 $ 0 $ (1,400 ) Commercial Real Estate – Nonowner-occupied Term Loans Origination Year Revolving loans Revolving loans converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 506,071 $ 895,827 $ 571,698 $ 508,960 $ 428,608 $ 1,663,763 $ 105,766 $ 2,078 $ 4,682,771 Special Mention 0 0 114,003 0 382 68,707 0 0 183,092 Substandard 0 735 13,814 6,995 1,124 92,695 0 0 115,363 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 506,071 $ 896,562 $ 699,515 $ 515,955 $ 430,114 $ 1,825,165 $ 105,766 $ 2,078 $ 4,981,226 YTD charge-offs 0 0 0 0 0 (3,101 ) 0 0 (3,101 ) YTD recoveries 0 0 0 0 0 303 0 0 303 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (2,798 ) $ 0 $ 0 $ (2,798 ) Term Loans Origination Year Revolving loans Revolving loans connverted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 929,001 $ 592,109 $ 596,260 $ 481,894 $ 502,417 $ 1,496,135 $ 118,404 $ 2,112 $ 4,718,332 Special Mention 0 105,104 0 391 8,902 78,591 0 0 192,988 Substandard 392 14,620 7,435 1,564 10,824 71,572 0 0 106,407 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 929,393 $ 711,833 $ 603,695 $ 483,849 $ 522,143 $ 1,646,298 $ 118,404 $ 2,112 $ 5,017,727 YTD charge-offs (38 ) 0 (300 ) 0 (3,394 ) (2,402 ) 0 0 (6,134 ) YTD recoveries 0 0 0 0 0 1,023 0 0 1,023 YTD net charge-offs $ (38 ) $ 0 $ (300 ) $ 0 $ (3,394 ) $ (1,379 ) $ 0 $ 0 $ (5,111 ) Other commercial Term Loans and leases Origination Year Revolving loans Revolving loans and leases converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 758,865 $ 898,082 $ 353,707 $ 129,477 $ 96,778 $ 112,242 $ 1,214,646 $ 2,257 $ 3,566,054 Special Mention 25 67 147 1,196 1,003 4,852 41,972 73 49,335 Substandard 8 1,047 807 2,234 455 21,876 15,532 284 42,243 Doubtful 0 0 0 0 0 140 0 0 140 Total $ 758,898 $ 899,196 $ 354,661 $ 132,907 $ 98,236 $ 139,110 $ 1,272,150 $ 2,614 $ 3,657,772 YTD charge-offs 0 0 (31 ) (100 ) (6 ) (2,447 ) (40 ) 0 (2,624 ) YTD recoveries 0 0 14 85 16 1,714 0 0 1,829 YTD net charge-offs $ 0 $ 0 $ (17 ) $ (15 ) $ 10 $ (733 ) $ (40 ) $ 0 $ (795 ) Term Loans and leases Origination Year Revolving loans Revolving loans and leases converted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 1,702,787 $ 370,059 $ 200,588 $ 112,170 $ 119,582 $ 257,638 $ 1,172,699 $ 2,668 $ 3,938,191 Special Mention 333 384 4,754 1,300 138 8,231 40,048 86 55,274 Substandard 1,649 830 2,241 2,606 6,565 30,308 16,222 360 60,781 Doubtful 0 0 0 0 37 135 0 0 172 Total $ 1,704,769 $ 371,273 $ 207,583 $ 116,076 $ 126,322 $ 296,312 $ 1,228,969 $ 3,114 $ 4,054,418 YTD charge-offs 0 0 (959 ) (23 ) (3,525 ) (12,843 ) 0 0 (17,350 ) YTD recoveries 94 864 18 12 684 2,789 0 0 4,461 YTD net charge-offs $ 94 $ 864 $ (941 ) $ (11 ) $ (2,841 ) $ (10,054 ) $ 0 $ 0 $ (12,889 ) Residential Real Estate Term Loans Origination Year Revolving loans Revolving loans converted to term loans Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 395,401 $ 628,539 $ 475,986 $ 407,397 $ 221,041 $ 1,019,262 $ 404,177 $ 3,044 $ 3,554,847 Special Mention 0 0 265 0 179 5,068 730 0 6,242 Substandard 0 0 393 424 3,196 21,571 270 114 25,968 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 395,401 $ 628,539 $ 476,644 $ 407,821 $ 224,416 $ 1,045,901 $ 405,177 $ 3,158 $ 3,587,057 YTD charge-offs 0 0 (30 ) 0 (116 ) (5,260 ) 0 0 (5,406 ) YTD recoveries 0 0 0 0 0 821 0 0 821 YTD net charge-offs $ 0 $ 0 $ (30 ) $ 0 $ (116 ) $ (4,439 ) $ 0 $ 0 $ (4,585 ) Term Loans Origination Year Revolving loans Revolving loans converted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 603,714 $ 624,142 $ 640,535 $ 292,700 $ 282,547 $ 975,913 $ 436,728 $ 4,224 $ 3,860,503 Special Mention 0 267 0 192 2,325 6,623 800 0 10,207 Substandard 0 282 440 3,263 3,516 20,967 201 227 28,896 Doubtful 0 0 0 0 0 279 0 0 279 Total $ 603,714 $ 624,691 $ 640,975 $ 296,155 $ 288,388 $ 1,003,782 $ 437,729 $ 4,451 $ 3,899,885 YTD charge-offs 0 0 0 0 (1 ) (1,759 ) 0 0 (1,760 ) YTD recoveries 0 0 0 101 0 961 1 0 1,063 YTD net charge-offs $ 0 $ 0 $ 0 $ 101 $ (1 ) $ (798 ) $ 1 $ 0 $ (697 ) Construction and Land Development Term Loans Origination Year Revolving loans Revolving loans converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 282,876 $ 507,181 $ 501,304 $ 267,413 $ 93,005 $ 86,486 $ 167,545 $ 0 $ 1,905,810 Special Mention 0 0 0 2,419 550 1,221 995 0 5,185 Substandard 386 0 278 941 0 15,706 746 0 18,057 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 283,262 $ 507,181 $ 501,582 $ 270,773 $ 93,555 $ 103,413 $ 169,286 $ 0 $ 1,929,052 YTD charge-offs 0 0 0 0 0 (255 ) 0 0 (255 ) YTD recoveries 0 0 0 0 0 48 0 0 48 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (207 ) $ 0 $ 0 $ (207 ) Term Loans Origination Year Revolving loans Revolving loans converted to Total \ 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 420,977 $ 663,113 $ 304,579 $ 127,377 $ 83,252 $ 53,713 $ 145,431 $ 0 $ 1,798,442 Special Mention 0 0 4,689 557 0 1,420 995 0 7,661 Substandard 0 250 1,535 0 216 17,499 746 0 20,246 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 420,977 $ 663,363 $ 310,803 $ 127,934 $ 83,468 $ 72,632 $ 147,172 $ 0 $ 1,826,349 YTD charge-offs 0 0 0 0 0 (2,027 ) 0 0 (2,027 ) YTD recoveries 0 0 0 0 0 1,513 0 0 1,513 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ (514 ) $ 0 $ 0 $ (514 ) Bankcard Term Loans Origination Year Revolving loans Revolving loans converted to term loans Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 7,710 $ 0 $ 7,710 Special Mention 0 0 0 0 0 0 41 0 41 Substandard 0 0 0 0 0 0 189 0 189 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 7,940 $ 0 $ 7,940 YTD charge-offs 0 0 0 0 0 0 (106 ) 0 (106 ) YTD recoveries 0 0 0 0 0 0 30 0 30 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (76 ) $ 0 $ (76 ) Term Loans Origination Year Revolving loans Revolving loans converted to term loans Total As of December 31, 2020 Internal Risk Grade: Pass $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 8,419 $ 0 $ 8,419 Special Mention 0 0 0 0 0 0 362 0 362 Substandard 0 0 0 0 0 0 156 0 156 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 8,937 $ 0 $ 8,937 YTD charge-offs 0 0 0 0 0 0 (221 ) 0 (221 ) YTD recoveries 0 0 0 0 0 0 52 0 52 YTD net charge-offs $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (169 ) $ 0 $ (169 ) Other Consumer Term Loans Origination Year Revolving loans Revolving loans converted to Total As of June 30, 2021 2021 2020 2019 2018 2017 Prior Internal Risk Grade: Pass $ 241,796 $ 380,844 $ 311,882 $ 170,348 $ 48,919 $ 12,089 $ 3,017 $ 0 $ 1,168,895 Special Mention 0 0 0 0 0 6 1 0 7 Substandard 0 2 0 0 0 0 0 0 2 Doubtful 0 0 0 0 0 0 0 0 0 Total $ 241,796 $ 380,846 $ 311,882 $ 170,348 $ 48,919 $ 12,095 $ 3,018 $ 0 $ 1,168,904 YTD charge-offs 0 (395 ) (505 ) (263 ) (80 ) (136 ) (7 ) 0 (1,386 ) YTD recoveries 0 34 25 38 8 103 2 0 210 YTD net charge-offs $ 0 $ (361 ) $ (480 ) $ (225 ) $ (72 ) $ (33 ) $ (5 ) $ 0 $ (1,176 ) Term Loans Origination Year Revolving loans Revolving loans converted to Total As of December 31, 2020 2020 2019 2018 2017 2016 Prior Internal Risk Grade: Pass $ 419,768 $ 401,958 $ 231,172 $ 74,550 $ 34,435 $ 7,466 $ 6,110 $ 0 $ 1,175,459 Special Mention 0 0 0 0 0 14,763 2 0 14,765 Substandard 3 0 0 0 0 2,352 0 0 2,355 Doubtful 0 0 0 0 0 1 0 0 1 Total $ 419,771 $ 401,958 $ 231,172 $ 74,550 $ 34,435 $ 24,582 $ 6,112 $ 0 $ 1,192,580 YTD charge-offs (136 ) (1,013 ) (1,040 ) (393 ) (228 ) (484 ) (2 ) 0 (3,296 ) YTD recoveries 3 74 113 30 43 216 0 0 479 YTD net charge-offs $ (133 ) $ (939 ) $ (927 ) $ (363 ) $ (185 ) $ (268 ) $ (2 ) $ 0 $ (2,817 )

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2021
Receivables [Abstract]
Schedule Of Credit Losses Related To Accrued Interest Receivables	The following table represents the accrued interest receivable as of June 30, 2021 and December 31, 2020: Accrued Interest Receivable At June 30, 2021 At December 31, 2020 Commercial Real Estate: Owner-occupied $ 3,823 $ 5,001 Nonowner-occupied 13,671 15,989 Other Commercial 11,678 12,320 Residential Real Estate 9,730 12,558 Construction 6,693 7,314 Consumer: Bankcard 0 0 Other consumer 2,993 3,211 $ 48,588 $ 56,393 Less: Allowance for credit losses (29 ) (250 ) Total $ 48,559 $ 56,143
Schedule of Accrued Interest Receivables Written off by Reversing Interest	The following table represents the accrued interest receivables written off by reversing interest income for the three months and six months ended June 30, 2021 and 2020 Accrued Interest Receivables Written Off by Reversing Interest Income Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 Commercial real estate: Owner-occupied $ 11 $ 83 $ 12 $ 100 Nonowner-occupied 4 38 40 45 Other commercial 2 33 8 45 Residential real estate 21 64 49 134 Construction & land development 0 0 0 0 Consumer: Bankcard 0 0 0 0 Other consumer 42 27 106 67 Total $ 80 $ 245 $ 215 $ 391
Schedule of Allowance for Loan Losses and Carrying Amount of Loans and Leases	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, 2021 Commercial Real Estate Other Residential Construction & Land Bankcard Allowance Total Owner- Nonowner- Other Allowance for Loan Losses: Beginning balance $ 21,074 $ 47,902 $ 84,504 $ 24,991 $ 38,329 $ 271 $ 14,511 $ 0 $ 231,582 Charge-offs (67 ) (0 ) (1 ) (5,193 ) (119 ) (71 ) (680 ) 0 (6,131 ) Recoveries 78 50 482 168 4 24 104 0 910 Provision (1,782 ) (5,906 ) (5,104 ) 6,085 (3,067 ) 30 928 0 (8,816 ) Ending balance $ 19,303 $ 42,046 $ 79,881 $ 26,051 $ 35,147 $ 254 $ 14,863 $ 0 $ 217,545 For the Six Months Ended June 30, 2021 Commercial Real Estate Other Residential Construction & Land Allowance Total Owner- Nonowner- Bankcard Other Allowance for Loan Losses: Beginning balance $ 23,354 $ 49,150 $ 78,138 $ 29,125 $ 39,077 $ 322 $ 16,664 $ 0 $ 235,830 Charge-offs (210 ) (3,101 ) (2,624 ) (5,406 ) (255 ) (106 ) (1,386 ) 0 (13,088 ) Recoveries 84 303 1,829 821 48 30 210 0 3,325 Provision (3,925 ) (4,306 ) 2,538 1,511 (3,723 ) 8 (625 ) 0 (8,522 ) Ending balance $ 19,303 $ 42,046 $ 79,881 $ 26,051 $ 35,147 $ 254 $ 14,863 $ 0 $ 217,545 Allowance for Loan and Lease Losses and Carrying Amount of Loans and Leases For the Year Ended December 31, 2020 Commercial Real Estate Other Residential Construction & Land Bankcard Allowance Total Owner- Nonowner- Other Allowance for Loan and Lease 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 (2,195 ) (6,134 ) (17,350 ) (1,760 ) (2,027 ) (221 ) (3,296 ) 0 (32,983 ) Recoveries 795 1,023 4,461 1,063 1,513 52 479 0 9,386 Provision 5,665 30,175 40,561 6,902 16,806 389 5,795 0 106,293 Ending balance $ 23,354 $ 49,150 $ 78,138 $ 29,125 $ 39,077 $ 322 $ 16,664 $ 0 $ 235,830

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following is a summary June 30, 2021 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 101,767 ($ 79,053 ) $ 0 $ 0 $ 101,767 ($ 79,053 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Crescent trade name 0 196 196 Total $ 0 $ 1,276 $ 1,276 Goodwill not subject to amortization $ 1,804,725 $ 5,315 $ 1,810,040 December 31, 2020 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 101,767 ($ 76,120 ) $ 0 $ 0 $ 101,767 ($ 76,120 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Crescent trade name 0 196 196 Total $ 0 $ 1,276 $ 1,276 Goodwill not subject to amortization $ 1,791,533 $ 5,315 $ 1,796,848
Reconciliation of Goodwill	The following table provides a reconciliation of goodwill: Community Mortgage Total Goodwill at December 31, 2020 $ 1,791,533 $ 5,315 $ 1,796,848 Goodwill 13,192 0 13,192 Goodwill at June 30, 2021 $ 1,804,725 $ 5,315 $ 1,810,040
Schedule of Anticipated Amortization Expense	The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2020: Year Amount 2021 $ 5,866 2022 4,983 2023 4,680 2024 3,255 2025 2,942 2026 and thereafter 3,921

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	6 Months Ended
	Jun. 30, 2021
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, 2021 and 2020: Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 MSRs beginning balance $ 23,401 $ 0 $ 22,338 $ 0 Addition from acquisition of subsidiary 0 20,123 0 20,123 Amount capitalized 3,111 1,891 6,335 1,891 Amount amortized (2,339 ) (1,104 ) (4,500 ) (1,104 ) MSRs ending balance $ 24,173 $ 20,910 $ 24,173 $ 20,910 MSRs valuation allowance beginning balance $ (1,383 ) $ 0 $ (1,383 ) $ 0 Aggregate additions charged and recoveries credited to operations 379 0 379 0 MSRs impairment (629 ) (710 ) (629 ) (710 ) MSRs valuation allowance ending balance $ (1,633 ) $ (710 ) $ (1,633 ) $ (710 ) MSRs, net of valuation allowance $ 22,540 $ 20,200 $ 22,540 $ 20,200

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Components of Lease Expense	The components of lease expense were as follows: Classification Three Months Three Months Operating lease cost Net occupancy expense $ 5,328 $ 5,895 Sublease income Net occupancy expense (358 ) (189 ) Net lease cost $ 4,970 $ 5,706 Classification Six Months Ended Six Months Operating lease cost Net occupancy expense $ 10,677 $ 10,961 Sublease income Net occupancy expense (655 ) (394 ) Net lease cost $ 10,022 $ 10,567
Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows: Classifi June 30, 2021 December 31, 2020 Operating lease right-of-use Operating lease right-of-use assets $ 66,635 $ 69,520 Operating lease liabilities Operating lease liabilities $ 70,546 $ 73,213
Other Information Related to Leases	Other information related to leases was as follows: June 30, 2021 Weighted-average remaining lease term: Operating leases 5.8 years Weighted-average discount rate: Operating leases 2.37 %
Supplemental Cash Flow Information Related to Leases	Supplemental cash flow information related to leases was as follows: Three Months Ended June 30, 2021 June 30, 2020 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 5,581 $ 5,722 ROU assets obtained in the exchange for lease liabilities 1,839 8,549 Six Months Ended June 30, 2021 June 30, 2020 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 11,027 $ 10,739 ROU assets obtained in the exchange for lease liabilities 6,282 12,332
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, 2020, consists of the following as of June 30, 2021 and December 31, 2020: Amount Year As of June 30, 2021 As of December 31, 2020 2021 $ 10,221 $ 20,172 2022 17,074 16,196 2023 13,616 12,723 2024 9,096 8,242 2025 6,362 5,516 Thereafter 18,842 15,330 Total lease payments 75,211 78,179 Less: imputed interest (4,665 ) (4,966 ) Total $ 70,546 $ 73,213

Long-Term Borrowings (Tables)

Long-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of Maturities of Long-term Borrowings	The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2021 $ 500,000 2022 22,159 2023 0 2024 0 2025 and thereafter 11,206 Total $ 533,365

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2021
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, 2021 and December 31, 2020. Asset Derivatives June 30, 2021 December 31, 2020 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Cash Flow Hedges: Interest rate swap contracts Other assets $ 500,000 $ 16,037 Other assets $ 500,000 $ 4,378 Total Cash Flow Hedges $ 500,000 $ 16,037 $ 500,000 $ 4,378 Total derivatives designated as hedging instruments $ 500,000 $ 16,037 $ 500,000 $ 4,378 Derivatives not designated as hedging instruments Forward loan sales commitments Other assets $ 32,166 $ 546 Other assets $ 62,418 $ 1,581 TBA mortgage-backed securities Other assets 98,709 296 Other assets 0 0 Interest rate lock commitments Other assets 703,161 17,438 Other assets 973,350 38,332 Total derivatives not designated as hedging instruments $ 834,036 $ 18,280 $ 1,035,768 $ 39,913 Total asset derivatives $ 1,334,036 $ 34,317 $ 1,535,768 $ 44,291 Liability Derivatives June 30, 2021 December 31, 2020 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 Other liabilities $ 74,748 $ 4,484 Other liabilities $ 77,011 $ 6,782 Total Fair Value Hedges $ 74,748 $ 4,484 $ 77,011 $ 6,782 Total derivatives designated as hedging instruments $ 74,748 $ 4,484 $ 77,011 $ 6,782 Derivatives not designated as hedging instruments Forward loan sales commitments Other liabilities $ 60,406 $ 249 Other liabilities $ 0 $ 0 TBA mortgage-backed securities Other liabilities 684,000 1,868 789,000 6,276 Total derivatives not designated as hedging instruments $ 744,406 $ 2,117 $ 789,000 $ 6,276 Total liability derivatives $ 819,154 $ 6,601 $ 866,011 $ 13,058
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, 2021 and December 31, 2020. June 30, 2021 Derivatives in Fair Value Hedging Relationships Location in the Statement Carrying Amount of Assets/(Liabilities) Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 75,523 $ (4,484 ) $ 0 December 31, 2020 Derivatives in Fair Value Hedging Relationships Location in the Statement Carrying Amount of Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 77,810 $ (6,782 ) $ 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, 2021 and 2020 are presented as follows: Income Statement Location Three Months Ended June 30, June 30, Derivatives in hedging relationships Cash flow Hedges: Interest rate swap contracts Interest on long-term borrowings $ (363 ) $ 0 Fair Value Hedges: Interest rate swap contracts Interest and fees on loans $ (558 ) $ (277 ) Total derivatives in hedging relationships $ (921 ) $ (277 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities $ 1,706 $ (553 ) TBA mortgage-backed securities Income from Mortgage Banking Activities (19,459 ) 17,204 Interest rate lock commitments Income from Mortgage Banking Activities (8,996 ) (1,527 ) Total derivatives not designated as hedging instruments $ (26,749 ) $ 15,124 Total derivatives $ (27,670 ) $ 14,847 Income Statement Location Six Months Ended June 30, June 30, Derivatives in hedging relationships Cash flow Hedges: Interest rate swap contracts Interest on long-term borrowings $ (586 ) $ 0 Fair Value Hedges: Interest rate swap contracts Interest and fees on loans $ (793 ) $ (720 ) Total derivatives in hedging relationships $ (1,379 ) $ (720 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities $ (1,284 ) $ 207 TBA mortgage-backed securities Income from Mortgage Banking Activities 4,704 (1,771 ) Interest rate lock commitments Income from Mortgage Banking Activities (15,987 ) 12,169 Total derivatives not designated as hedging instruments $ (12,567 ) $ 10,605 Total derivatives $ (13,946 ) $ 9,885

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2021
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, 2021 and December 31, 2020, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2021 Using Description Balance as of June 30, 2021 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 $ 15,147 $ 0 $ 15,147 $ 0 State and political subdivisions 614,046 0 614,046 0 Residential mortgage-backed securities Agency 985,002 0 985,002 0 Non-agency 39,603 0 39,603 0 Commercial mortgage-backed sec Agency 652,557 0 652,557 0 Asset-backed securities 489,433 0 489,433 0 Single issue trust preferred securities 17,417 0 17,417 0 Other corporate securities 463,869 5,983 457,886 0 Total available for sale securities 3,277,074 5,983 3,271,091 0 Equity securities: Financial services industry 169 169 0 0 Equity mutual funds (1) 5,445 5,445 0 0 Other equity securities 5,893 5,893 0 0 Total equity securities 11,507 11,507 0 0 Loans held for sale 576,827 0 44,553 532,274 Fair Value at June 30, 2021 Using Description Balance as of June 30, 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Derivative financial assets: Interest rate swap contracts 16,037 0 16,037 0 Forward sales commitments 546 0 546 0 TBA mortgage-backed securities 296 0 0 296 Interest rate lock commitments 17,438 0 2,888 14,550 Total derivative financial assets 34,317 0 19,471 14,846 Liabilities Derivative financial liabilities: Interest rate swap contracts 4,484 0 4,484 0 Forward sales commitments 249 0 0 249 TBA mortgage-backed securities 1,868 0 124 1,744 Total derivative financial liabilities 6,601 0 4,608 1,993 (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, 2020 Using Description Balance as of December 31, 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 $ 66,344 $ 0 $ 66,344 $ 0 State and political subdivisions 565,160 0 565,160 0 Residential mortgage-backed securities Agency 928,891 0 928,891 0 Non-agency 21,776 0 21,776 0 Commercial mortgage-backed securities Agency 675,145 0 675,145 0 Asset-backed securities 294,623 0 294,623 0 Single issue trust preferred securities 17,027 0 17,027 0 Other corporate securities 384,393 6,207 378,186 0 Total available for sale securities 2,953,359 6,207 2,947,152 0 Equity securities: Financial services industry 134 134 0 0 Equity mutual funds (1) 4,602 4,602 0 0 Other equity securities 5,982 5,982 0 0 Total equity securities 10,718 10,718 0 0 Loans held for sale 698,341 0 43,608 654,733 Derivative financial assets: Interest rate swap contracts 4,378 0 4,378 0 Forward sales commitments 1,581 0 1,581 0 TBA mortgage-backed securities 0 0 0 0 Interest rate lock commitments 38,332 0 6,321 32,011 Total derivative financial assets 44,291 0 12,280 32,011 Liabilities Derivative financial liabilities: Interest rate swap contracts 6,782 0 6,782 0 TBA mortgage-backed securities 6,276 0 6,276 0 Total derivative financial liabilities 13,058 0 13,058 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 at fair value at June 30, 2021 and December 31, 2020 on a recurring basis and for which United has utilized Level 3 inputs to determine fair value: Loans held for sale June 30, 2021 December 31, Balance, beginning of period $ 654,733 $ 384,375 Originations 2,888,337 5,699,581 Sales (3,090,988 ) (5,652,693 ) Total gains or losses during the period recognized in earnings 80,192 223,470 Transfers in and/or out of Level 3 (0 ) (0 ) Balance, end of period $ 532,274 $ 654,733 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 TBA Securities June 30, 2021 December 31, Balance, beginning of period $ 0 $ 0 Transfers other 296 0 Balance, end of period $ 296 $ 0 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, 2021 December 31, Balance, beginning of period $ 32,011 $ 4,518 Transfers other (17,461 ) 27,493 Balance, end of period $ 14,550 $ 32,011 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 Liabilities Forward Sales Commitments June 30, 2021 December 31, 2020 Balance, beginning of period $ 0 $ 0 Transfers other 249 0 Balance, end of period $ 249 $ 0 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 Liabilities TBA Securities June 30, 2021 December 31, Balance, beginning of period $ 0 $ 0 Transfers other 1,744 0 Balance, end of period $ 1,744 $ 0 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, 2021 Three Months Ended June 30, 2020 Income from mortgage banking activities $ 6,075 $ 8,846 Description Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Income from mortgage banking activities $ (11,776 ) $ 10,471
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, 2021 December 31, 2020 Description Unpaid Fair Fair Value Unpaid Fair Fair Value Loans held for sale $ 562,200 $ 576,827 $ 14,627 $ 672,458 $ 698,341 $ 25,883
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: Description Balance as of June 30, 2021 Carrying value at June 30, 2021 YTD Gains (Losses) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Individually assessed loans $ 17,893 $ 0 $ 13,591 $ 4,302 $ (1,430 ) OREO 18,474 0 18,474 0 (3,528 ) Mortgage servicing rights 24,630 0 0 24,630 (250 ) Description Balance as of December 31, 2020 Carrying value at December 31, 2020 YTD Gains (Losses) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Loans held for sale $ 20,596 $ 0 $ 20,596 $ 0 $ (197 ) Individually assessed loans 37,498 0 14,467 23,031 1,318 OREO 22,595 0 22,595 0 (1,618 ) Mortgage servicing rights 20,955 0 0 20,955 (1,383 )
Summary of Estimated Fair Values of Financial Instruments	The estimated fair values of United’s financial instruments are summarized below: Fair Value Measurements Carrying Amount 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, 2021 Cash and cash equivalents $ 3,677,396 $ 3,677,396 $ 0 $ 3,677,396 $ 0 Securities available for sale 3,277,074 3,277,074 5,983 3,271,091 0 Securities held to maturity 989 1,020 0 0 1,020 Equity securities 11,507 11,507 11,507 0 0 Other securities 221,931 210,834 0 0 210,834 Loans held for sale 576,827 576,827 0 44,553 532,274 Net loans 16,670,456 16,153,015 0 0 16,153,015 Derivative financial assets 34,317 34,317 0 19,471 14,846 Mortgage servicing rights 22,540 24,630 0 0 24,630 Deposits 21,567,391 21,555,714 0 21,555,714 0 Short-term borrowings 127,745 127,745 0 127,745 0 Long-term borrowings 814,022 768,278 0 768,278 0 Derivative financial liabilities 6,601 6,601 0 4,608 1,993 December 31, 2020 Cash and cash equivalents $ 2,209,068 $ 2,209,068 $ 0 $ 2,209,068 $ 0 Securities available for sale 2,953,359 2,953,359 6,207 2,947,152 0 Securities held to maturity 1,212 1,235 0 215 1,020 Equity securities 10,718 10,718 10,718 0 0 Other securities 220,895 209,850 0 0 209,850 Loans held for sale 718,937 718,937 0 64,204 654,733 Net loans 17,355,583 16,559,797 0 0 16,559,797 Derivative financial assets 44,291 44,291 0 12,280 32,011 Mortgage servicing rights 20,955 20,955 0 0 20,955 Deposits 20,585,160 20,583,607 0 20,583,607 0 Short-term borrowings 142,300 142,300 0 142,300 0 Long-term borrowings 864,369 815,991 0 815,991 0 Derivative financial liabilities 13,058 13,058 0 13,058 0

Stock Based Compensation (Table

Stock Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2021
Stock Based Compensation [Line Items]
Summary of Stock Option Plans	A summary of activity under United’s stock option plans as of June 30, 2021, and the changes during the first six months of 2021 are presented below: Six Months Ended June 30, 2021 Weighted Average Shares Aggregate Intrinsic Value Remaining Contractual Term (Yrs.) Exercise Price Outstanding at January 1, 2021 1,904,557 $ 34.14 Granted 49,978 32.51 Exercised (173,945 ) 28.65 Forfeited or expired (110,229 ) 28.69 Outstanding at June 30, 2021 1,670,361 $ 5,358 5.3 $ 35.02 Exercisable at June 30, 2021 1,315,307 $ 4,654 4.8 $ 34.91
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 2021: Shares Weighted-Average Grant Date Fair Value Per Share Nonvested at January 1, 2021 544,905 $ 6.93 Granted 49,978 5.65 Vested (239,659 ) 7.32 Forfeited or expired (170 ) 5.65 Nonvested at June 30, 2021 355,054 $ 6.49
Changes to United's Restricted Common Shares	The following summarizes the changes to United’s nonvested restricted common shares for the period ended June 30, 2021: Shares Weighted-Average Nonvested at January 1, 2021 340,976 $ 35.41 Granted 182,344 35.97 Vested (129,061 ) 36.90 Forfeited (1,971 ) 36.70 Nonvested at June 30, 2021 392,288 $ 35.18
Restricted Stock Units (RSUs) [Member]
Stock Based Compensation [Line Items]
Status of United's Nonvested Stock Option Awards	The following table summarizes the status of United’s nonvested RSUs during the first six months of 2021: Shares Weighted-Average Nonvested at January 1, 2021 0 $ 0.00 Granted 136,896 35.65 Vested 0 0.00 Forfeited or expired 0 0.00 Nonvested at June 30, 2021 136,896 $ 35.65

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2021
Retirement Benefits [Abstract]
Net Periodic Pension Cost	Net periodic pension cost for the three and six months ended June 30, 2021 and 2020 included the following components: Three Months Ended June 30 Six Months Ended June 30 2021 2020 2021 2020 Service cost $ 758 $ 715 $ 1,508 $ 1,430 Interest cost 1,031 1,286 2,051 2,573 Expected return on plan assets (2,957 ) (2,630 ) (5,881 ) (5,259 ) Recognized net actuarial loss 1,589 1,442 3,161 2,884 Net periodic pension cost $ 421 $ 813 $ 839 $ 1,628 Weighted-average assumptions: Discount rate 2.81 % 3.42 % 2.81 % 3.42 % Expected return on assets 6.25 % 6.75 % 6.25 % 6.75 % Rate of compensation increase (prior to age 40) 5.00 % 5.00 % 5.00 % 5.00 % Rate of compensation increase (ages 40-54) 4.00 % 4.00 % 4.00 % 4.00 % Rate of compensation increase (otherwise) 3.50 % 3.50 % 3.50 % 3.50 %

Comprehensive Income (Tables)

Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Components of Total Comprehensive Income	The components of total comprehensive income for the three and six months ended June 30, 2021 and 2020 are as follows: Three Months Ended Six Months Ended 2021 2020 2021 2020 Net Income $ 94,836 $ 52,686 $ 201,734 $ 92,869 Available for sale (“AFS”) securities: Change in net unrealized gain on AFS securities arising during the period 18,040 37,756 (27,927 ) 60,859 Related income tax effect (4,203 ) (8,797 ) 6,507 (14,180 ) Net reclassification adjustment for gains included in net income (0 ) (1,466 ) (1,444 ) (1,641 ) Related income tax expense 0 341 336 382 Net effect of AFS securities on other comprehensive income 13,837 27,834 (22,528 ) 45,420 Cash flow hedge derivatives: Unrealized gain on cash flow hedge before reclassification to interest expense (8,243 ) (1,659 ) 11,074 (1,659 ) Related income tax effect 1,921 387 (2,580 ) 387 Net reclassification adjustment for losses included in net income 363 0 586 0 Related income tax effect (85 ) 0 (137 ) 0 Net effect of cash flow hedge derivatives on other comprehensive income (6,044 ) (1,272 ) 8,943 (1,272 ) Three Months Ended Six Months Ended June 30 2021 2020 2021 2020 Pension plan: Recognized net actuarial loss 1,589 1,442 3,161 2,884 Related income tax benefit (720 ) (329 ) (1,423 ) (659 ) Net effect of change in pension plan asset on other comprehensive income 869 1,113 1,738 2,225 Total change in other comprehensive income 8,662 27,675 (11,847 ) 46,373 Total Comprehensive Income $ 103,498 $ 80,361 $ 189,887 $ 139,242
Components of Accumulated Other Comprehensive Income	The components of accumulated other comprehensive income for the six months ended June 30, 2021 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2021 Unrealized Unrealized Defined Items Total Balance at January 1, 2021 $ 65,205 $ 3,358 $ (46,193 ) $ 22,370 Other comprehensive income before reclassification (21,420 ) 8,494 0 (12,926 ) Amounts reclassified from accumulated other comprehensive income (1,108 ) 449 1,738 1,079 Net current-period other comprehensive income, net of tax (22,528 ) 8,943 1,738 (11,847 ) Balance at June 30, 2021 $ 42,677 $ 12,301 $ (44,455 ) $ 10,523 (a) All amounts are net-of-tax.
Reclassifications Out of Accumulated Other Comprehensive Income	Reclassifications out of Accumulated Other Comprehensive Income (AOCI) For the Six Months Ended June 30, 2021 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 gains included in net income $ (1,444 ) Net investment securities gains (1,444 ) Total before tax Related income tax effect 336 Tax expense (1,108 ) Net of tax Cash flow hedge: Net reclassification adjustment for losses included in net income $ 586 Interest expense 586 Total before tax Related income tax effect (137 ) Tax expense 449 Net of tax Pension plan: Recognized net actuarial loss 3,161 (a) 3,161 Total before tax Related income tax effect (1,423 ) Tax expense 1,738 Net of tax Total reclassifications for the period $ 1,079 (a) This AOCI component is included in the computation of changes in plan assets (see Note 16, Employee Benefit Plans)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2021
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 2021 2020 2021 2020 Distributed earnings allocated to common stock $ 45,085 $ 45,298 $ 90,153 $ 80,785 Undistributed earnings allocated to common stock 49,478 7,262 111,007 11,840 Net earnings allocated to common shareholders $ 94,563 $ 52,560 $ 201,160 $ 92,625 Average common shares outstanding 128,750,851 119,823,652 128,693,616 110,559,363 Equivalents from stock options 283,137 64,171 252,664 65,613 Average diluted shares outstanding 129,033,988 119,887,823 128,946,280 110,624,976 Earnings per basic common share $ 0.73 $ 0.44 $ 1.56 $ 0.84 Earnings per diluted common share $ 0.73 $ 0.44 $ 1.56 $ 0.84

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2021
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 Capital Securities Issued Stated Interest Rate Maturity Date United Statutory Trust III December 17, 2003 $ 20,000 3-month LIBOR + 2.85% 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 LIBOR + 3.10% 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, 2021 As of December 31, 2020 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 295,246 $ 284,503 $ 10,743 $ 295,466 $ 284,788 $ 10,678 (1) Represents investment in VIEs.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2021
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, 2021 and 2020 is as follows: At and For the Three Months Ended June 30, 2021 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 183,400 $ 2,871 $ (2,106 ) $ 2,352 $ 186,517 Provision for credit (8,879 ) 0 0 0 (8,879 ) Other income 24,072 39,765 1,132 (2,123 ) 62,846 Other expense 103,429 36,391 (1,098 ) 229 138,951 Income taxes 23,149 1,280 26 0 24,455 Net income (loss) $ 89,773 $ 4,965 $ 98 $ 0 $ 94,836 Total assets (liabilities) $ 26,831,380 $ 720,912 $ 32,619 $ (393,985 ) $ 27,190,926 Average assets (liabilities) 26,661,453 729,114 26,090 (410,699 ) 27,005,958 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 credit 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 Six Months Ended June 30, 2021 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 370,597 $ 5,521 $ (4,244 ) $ 5,603 $ 377,477 Provision for credit (8,736 ) 0 0 0 (8,736 ) Other income 50,460 107,272 2,653 (4,966 ) 155,419 Other expense 213,446 77,574 (3,779 ) 637 287,878 Income taxes 44,351 7,220 449 0 52,020 Net income (loss) $ 171,996 $ 27,999 $ 1,739 $ 0 $ 201,734 Total assets (liabilities) $ 26,831,380 $ 720,912 $ 32,619 $ (393,985 ) $ 27,190,926 Average assets (liabilities) 26,409,142 722,997 24,709 (406,747 ) 26,750,101 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 credit 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

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands	Jun. 02, 2021$ / shares	May 01, 2020USD ($)$ / sharesshares	Nov. 17, 2019$ / shares	Jun. 30, 2020USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)$ / sharesshares	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)$ / shares
Business Acquisition [Line Items]
Par value of Share | $ / shares						$ 2.50		$ 2.50
Loans at consummation						$ 16,921,652		$ 17,622,583
Business acquisition costs					$ 48,009		$ 46,449
Business combination intangible assets acquired goodwill						13,192
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments for assets with credit deterioration								18,635
Loans and leases net of unearned income						$ 16,888,001		$ 17,591,413
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
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				28,031,501
Business combination intangible assets acquired goodwill		$ 332,026
Business combination intangible assets acquired other than goodwill core deposit intangibles finite lived		3,408
Business combination intangible assets acquired other than goodwill indefinite lived		196
Business acquisition loans purchase deterioration credit loans acquired discount due to diiferences in purchase consideration		$ 7,212
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				$ 104,069
Business acquisition net income of the acquiree included in the total revenue since the date of acquisition				$ 53,632
Business acquisition, percentage of voting interests acquired		100.00%
Loans and leases net of unearned income		$ 5,004,990
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] | Securities Investment [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration		620
Carolina Financial [Member] | Loans And Leases [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration		47,425
Business acquisition loans purchase deterioration credit loans acquired discount due to diiferences in purchase consideration		7,212
Business acquisition allowances for loans and lease losses including reserve for unfunded commitments for assets with credit deterioration		18,635
Carolina Financial [Member] | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration [Member]
Business Acquisition [Line Items]
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] | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration [Member] | Loans And Leases [Member]
Business Acquisition [Line Items]
Business combination loans and leases receivable without purchased credit deterioration gross		40,213
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						4 years 1 month 6 days
Carolina Financial [Member] | Building [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration		5,908
Business combination finite lived tangible assets remaining useful life on premium paid						30 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		4,357
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						15 years 9 months
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 6 months
Carolina Financial [Member] | Federal Home Loan Bank Advances [Member]
Business Acquisition [Line Items]
Business combination fair value adjustment to purchase consideration		$ 468
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
Community Bankers Trust Corporation [Member]
Business Acquisition [Line Items]
Stock issued during period merger conversion ratio	0.3173
Par value of Share | $ / shares	$ 2.50
Loans at consummation						$ 1,209,784
Deposits at consummation						1,488,828
Loans and leases net of unearned income						$ 1,754,213
Common Stock, Conversion Basis	0.3173

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	Dec. 31, 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
Carolina Financial [Member]
Disclosure Detail of Reconciliation of Difference Between Purchase Price and Par Value of Purchase Credit Loans Acquired [Line Items]
Non-credit discount at acquisition	$ 7,212
Carolina Financial [Member] | Loans And Leases [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 and leases at acquisition	1,023,531
Allowance for credit losses at acquisition	18,635
Non-credit discount at acquisition	7,212
Par value (UPB) of acquired PCD loans and leases at acquisition	$ 1,049,378

Mergers and Acquisitions - Su_2

Mergers and Acquisitions - Summary of Business Acquisitions, by Acquisition (Detail) - USD ($) $ in Thousands	May 01, 2020	Jun. 30, 2021	Dec. 31, 2020
Identifiable liabilities:
Resulting goodwill		$ 1,810,040	$ 1,796,848
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	580,791
Loans held for sale	65,757
Net loans and leases	3,246,940
Premises and equipment	79,127
Operating lease right-of-use asset	9,861
Crescent trade name intangible	196
Core deposit intangible	3,408
Mortgage servicing rights	20,123
Other assets	159,218
Total identifiable assets	4,794,575
Identifiable liabilities:
Deposits	3,884,977
Short-term borrowings	332,000
Long-term borrowings	42,738
Operating lease liability	9,861
Other liabilities	39,148
Total identifiable liabilities	4,308,724
Fair value of net assets acquired including identifiable intangible assets	485,851
Resulting goodwill	$ 332,026

Mergers and Acquisitions - Su_3

Mergers and Acquisitions - Summary of Business Acquisitions, by Acquisition (Parenthetical) (Detail) - shares	May 01, 2020	Jun. 30, 2021
Carolina Financial [Member]
Business Acquisition [Line Items]
Business combination shares issued during the year	28,031,501	28,031,501

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Amortized Cost	$ 3,221,432	$ 2,868,346
Gross Unrealized Gains	68,355	91,172
Gross Unrealized Losses	12,713	6,159
Allowance For Credit Losses	0	0
Estimated Fair Value	3,277,074	2,953,359
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	14,908	65,804
Gross Unrealized Gains	242	543
Gross Unrealized Losses	3	3
Allowance For Credit Losses	0	0
Estimated Fair Value	15,147	66,344
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Amortized Cost	592,778	538,082
Gross Unrealized Gains	22,585	27,330
Gross Unrealized Losses	1,317	252
Allowance For Credit Losses	0	0
Estimated Fair Value	614,046	565,160
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	973,328	905,230
Gross Unrealized Gains	17,216	24,134
Gross Unrealized Losses	5,542	473
Allowance For Credit Losses	0	0
Estimated Fair Value	985,002	928,891
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	39,792	21,639
Gross Unrealized Gains	15	137
Gross Unrealized Losses	204	0
Allowance For Credit Losses	0	0
Estimated Fair Value	39,603	21,776
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	634,647	644,774
Gross Unrealized Gains	21,212	31,009
Gross Unrealized Losses	3,302	638
Allowance For Credit Losses	0	0
Estimated Fair Value	652,557	675,145
Asset-backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	489,901	297,834
Gross Unrealized Gains	714	204
Gross Unrealized Losses	1,182	3,415
Allowance For Credit Losses	0	0
Estimated Fair Value	489,433	294,623
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	18,249	18,230
Gross Unrealized Gains	188	167
Gross Unrealized Losses	1,020	1,370
Allowance For Credit Losses	0	0
Estimated Fair Value	17,417	17,027
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost	457,829	376,753
Gross Unrealized Gains	6,183	7,648
Gross Unrealized Losses	143	8
Allowance For Credit Losses	0	0
Estimated Fair Value	$ 463,869	$ 384,393

Investment Securities - Summa_2

Investment Securities - Summary of Securities Available for Sale in an Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 785,509	$ 253,780
Less than 12 months, Unrealized Losses	10,717	1,368
12 months or longer, Fair Value	164,167	283,775
12 months or longer, Unrealized Losses	1,996	4,791
Total, Fair Value	949,676	537,555
Total, Unrealized Losses	12,713	6,159
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	0	297
Less than 12 months, Unrealized Losses	0	3
12 months or longer, Fair Value	252	0
12 months or longer, Unrealized Losses	3	0
Total, Fair Value	252	297
Total, Unrealized Losses	3	3
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	63,639	30,480
Less than 12 months, Unrealized Losses	1,254	252
12 months or longer, Fair Value	4,920	0
12 months or longer, Unrealized Losses	63	0
Total, Fair Value	68,559	30,480
Total, Unrealized Losses	1,317	252
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	393,743	131,114
Less than 12 months, Unrealized Losses	5,542	467
12 months or longer, Fair Value	0	3,867
12 months or longer, Unrealized Losses	0	6
Total, Fair Value	393,743	134,981
Total, Unrealized Losses	5,542	473
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	20,261	0
Less than 12 months, Unrealized Losses	204	0
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	20,261	0
Total, Unrealized Losses	204	0
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	117,331	83,395
Less than 12 months, Unrealized Losses	3,302	638
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	117,331	83,395
Total, Unrealized Losses	3,302	638
Asset-backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	143,276	0
Less than 12 months, Unrealized Losses	272	0
12 months or longer, Fair Value	145,807	266,104
12 months or longer, Unrealized Losses	910	3,415
Total, Fair Value	289,083	266,104
Total, Unrealized Losses	1,182	3,415
Trust Preferred Collateralized Debt Obligations [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
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	13,188	13,804
12 months or longer, Unrealized Losses	1,020	1,370
Total, Fair Value	13,188	13,804
Total, Unrealized Losses	1,020	1,370
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	47,259	8,494
Less than 12 months, Unrealized Losses	143	8
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Total, Fair Value	47,259	8,494
Total, Unrealized Losses	$ 143	$ 8

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales and calls	$ 131,464	$ 280,780	$ 400,993	$ 413,706
Gross realized gains	0	1,565	1,542	1,818
Gross realized losses	$ 0	$ 98	$ 98	$ 177

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2021USD ($)Securities	Jun. 30, 2021USD ($)Securities	Dec. 31, 2020USD ($)
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 12,713,000	$ 12,713,000	$ 6,159,000
Available for sale securities in unrealized loss position | Securities	113	113
Available for sale securities in portfolio, number | Securities	1,005	1,005
Amortized cost of available for sale securities	$ 3,221,432,000	$ 3,221,432,000	2,868,346,000
Capitalization of banks, equal to or greater than, in the single-issue trust preferred portfolio	10,000,000,000	10,000,000,000
Equity securities at estimated fair value	11,507,000	11,507,000	10,718,000
Carrying value of securities pledged	$ 1,912,762,000	1,912,762,000	1,942,087,000
Accrued interest receivable		$ 12,220,000	10,663,000
Federal Family Education Loan Program [Member] | Fitch, AA+ Rating [Member]
Schedule of Investments [Line Items]
Percentage of asset backed securities with credit rating	55.00%	55.00%
Credit rating of asset backed securities		AA+
Percentage of asset backed securities without credit rating	41.00%	41.00%
Minimum [Member] | Federal Family Education Loan Program [Member] | Fitch, AA+ Rating [Member]
Schedule of Investments [Line Items]
Percentage of repayment guaranteed by the government	97.00%	97.00%
Below Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	$ 11,514,000	$ 11,514,000
Split Rated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	978,000	978,000
Unrated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	5,757,000	5,757,000
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	1,317,000	1,317,000	252,000
Amortized cost of available for sale securities	$ 592,778,000	$ 592,778,000	538,082,000
Percent of portfolio with credit support	59.00%	59.00%
Agency Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	$ 1,607,975,000	$ 1,607,975,000
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	3,302,000	3,302,000	638,000
Amortized cost of available for sale securities	634,647,000	634,647,000	644,774,000
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	5,542,000	5,542,000	473,000
Amortized cost of available for sale securities	973,328,000	973,328,000	905,230,000
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	204,000	204,000	0
Amortized cost of available for sale securities	$ 39,792,000	39,792,000	21,639,000
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings		$ 0
Percentage of available for sale securities at amortized cost unrated	100.00%	100.00%
Residential Mortgage-Backed Securities, Non-agency [Member] | AAA [Member]
Schedule of Investments [Line Items]
Percentage of available for sale securities at amortized cost rated	39792.00%	39792.00%
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 143,000	$ 143,000	8,000
Amortized cost of available for sale securities	$ 457,829,000	$ 457,829,000	376,753,000
Corporate Bonds [Member] | Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	86.00%	86.00%
Corporate Bonds [Member] | Below Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	2.00%	2.00%
Corporate Bonds [Member] | Unrated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	12.00%	12.00%
Asset-backed Securities [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 1,182,000	$ 1,182,000	3,415,000
Amortized cost of available for sale securities	489,901,000	$ 489,901,000	$ 297,834,000
Asset-backed Securities [Member] | Federal Family Education Loan Program [Member] | Fitch, AA+ Rating [Member]
Schedule of Investments [Line Items]
Impairment of investment in asset backed securities	$ 0

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, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 72,479	$ 150,575
Due after one year through five years, Amortized Cost	596,359	495,922
Due after five years through ten years, Amortized Cost	688,537	688,264
Due after ten years, Amortized Cost	1,864,057	1,533,585
Amortized Cost	3,221,432	2,868,346
Due in one year or less, Estimated Fair Value	72,978	151,651
Due after one year through five years, Estimated Fair Value	611,994	514,441
Due after five years through ten years, Estimated Fair Value	702,870	714,416
Due after ten years, Estimated Fair Value	1,889,232	1,572,851
Total available for sale securities	$ 3,277,074	$ 2,953,359

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Net gains recognized during the period	$ 24	$ 43	$ 734	$ 65
Net gains recognized during the period on equity securities sold	0	1	788	7
Unrealized gains recognized during the period on equity securities still held at period end	24	43	51	114
Unrealized losses recognized during the period on equity securities still held at period end	$ 0	$ (1)	$ (105)	$ (56)

Loans - Major Classes of Loans

Loans - Major Classes of Loans And Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Commercial, financial, and agricultural
Total commercial, financial & agricultural	$ 10,228,699	$ 10,694,832
Residential real estate	3,587,057	3,899,885
Construction & land development	1,929,052	1,826,349
Consumer:
Bankcard	7,940	8,937
Other consumer	1,168,904	1,192,580
Less: Unearned income	(33,651)	(31,170)
Loans and leases, net of unearned income	16,888,001	17,591,413
Owner-Occupied Commercial Real Estate [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	1,589,701	1,622,687
Nonowner-Occupied Commercial Real Estate [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	4,981,226	5,017,727
Other Commercial Loans And Leases [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	$ 3,657,772	$ 4,054,418

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loans held for sale	$ 576,827	$ 718,937
Directors and Officers [Member]
Related party loans	$ 32,791	$ 35,756

Credit Quality - Additional Inf

Credit Quality - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021USD ($)Contract	Jun. 30, 2020Contract	Jun. 30, 2021USD ($)Contract	Jun. 30, 2020Contract	Dec. 31, 2020USD ($)
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			$ 47,271		$ 55,657
Restructured loans on nonaccrual status	$ 32,471		$ 32,471		41,185
Minimum number of days required for special mention			30 days
Maximum number of days required for special mention			89 days
Number of days required for substandard			90 days
OREO	18,474		$ 18,474		22,595
Recorded investment of consumer mortgage loans	71		71
Troubled debt restructurings post modification additional funds recorded investment			$ 125
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	$ 13		$ 13
Loans Modification Explanation			This program allows for a deferral of payments from the period beginning March 1, 2020 until the earlier of January 1, 2022 or the date that is 60 days after the date on which the national emergency concerning the COVID-19 outbreak terminates. As provided for under the CARES Act, these loan modifications are exempt by law from classification as a TDR as defined by GAAP.
Number of eligible loans modification received | Contract	2	1	3	1
Mortgage Loan Related to Property Sales					0
Temporary Relief From Troubled Debt Restructurings [Member] | Covid 19 [Member]
Number of eligible loans modification received			238
Restructured loans modified by temporary relief from trouble debt restructurings amount during period			$ 66,364
No of eligible loan modifications outstanding	1,002		1,002
Troubled debt restructuring	$ 399,857		$ 399,857
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Restructured loans on nonaccrual status	46		46		$ 197
Financing Receivables 30 To 89 Days Past Due [Member]
Restructured loans on nonaccrual status	$ 1,362		$ 1,362

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, 2021	Dec. 31, 2020
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	$ 47,271	$ 55,657
Interest rate reduction [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	10,204	10,774
Interest rate reduction and change in terms [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	0	2,346
Forgiveness of principal [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	200	214
Concession of principal and term [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	20	22
Transfer of asset [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	4,465	0
Extended maturity [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	5,546	4,414
Change in terms [Member]
Disclosure Details Of Reasons For Modification Troubled Debt Restrusturing Loans [Line Items]
Troubled debt restructuring	$ 26,836	$ 37,887

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, 2021USD ($)Contract	Jun. 30, 2020USD ($)Contract	Jun. 30, 2021USD ($)Contract	Jun. 30, 2020USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	69	4	79
Pre-Modification Outstanding Recorded Investment	$ 5,594	$ 22,576	$ 7,470	$ 33,070
Post-Modification Outstanding Recorded Investment	$ 5,545	$ 22,389	$ 7,579	$ 32,393
Construction & Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	9	0	12
Pre-Modification Outstanding Recorded Investment	$ 0	$ 2,562	$ 0	$ 4,607
Post-Modification Outstanding Recorded Investment	$ 0	$ 2,557	$ 0	$ 4,570
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	18	1	21
Pre-Modification Outstanding Recorded Investment	$ 0	$ 10,628	$ 940	$ 18,579
Post-Modification Outstanding Recorded Investment	$ 0	$ 10,586	$ 1,106	$ 18,345
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	6	2	6
Pre-Modification Outstanding Recorded Investment	$ 5,413	$ 2,259	$ 6,349	$ 2,259
Post-Modification Outstanding Recorded Investment	$ 5,364	$ 2,248	$ 6,292	$ 2,248
Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	14	1	18
Pre-Modification Outstanding Recorded Investment	$ 181	$ 3,169	$ 181	$ 3,667
Post-Modification Outstanding Recorded Investment	$ 181	$ 3,090	$ 181	$ 3,322
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	19	0	19
Pre-Modification Outstanding Recorded Investment	$ 0	$ 3,889	$ 0	$ 3,889
Post-Modification Outstanding Recorded Investment	$ 0	$ 3,872	$ 0	$ 3,872
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	0	3	0	3
Pre-Modification Outstanding Recorded Investment	$ 0	$ 69	$ 0	$ 69
Post-Modification Outstanding Recorded Investment	$ 0	$ 36	$ 0	$ 36

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, 2021USD ($)Contract	Jun. 30, 2020USD ($)Contract	Jun. 30, 2021USD ($)Contract	Jun. 30, 2020USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	1	3	1
Recorded Investment | $	$ 0	$ 690	$ 0	$ 690
Construction & Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	1	2	1
Recorded Investment | $	$ 0	$ 690	$ 0	$ 690
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	0	1	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Consumer [Member] | Bankcard [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0

Credit Quality - Schedule of Ag

Credit Quality - Schedule of Age Analysis of its Past Due Loans and Leases, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	$ 82,799	$ 74,978
Loans, Total Past Due	170,633	192,713
Loans, Current & Other	16,751,019	17,429,870
Loans and leases	16,921,652	17,622,583
Loans, Recorded Investment >90 Days & Accruing	14,181	13,832
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	87,834	117,735
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	1,637	1,919
Loans, Total Past Due	5,023	7,804
Loans, Current & Other	1,924,029	1,818,545
Loans and leases	1,929,052	1,826,349
Loans, Recorded Investment >90 Days & Accruing	133	461
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	3,386	5,885
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	4,735	4,556
Loans, Total Past Due	24,584	33,035
Loans, Current & Other	1,565,117	1,589,652
Loans and leases	1,589,701	1,622,687
Loans, Recorded Investment >90 Days & Accruing	832	0
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	19,849	28,479
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	5,753	6,837
Loans, Total Past Due	31,473	36,129
Loans, Current & Other	4,949,753	4,981,598
Loans and leases	4,981,226	5,017,727
Loans, Recorded Investment >90 Days & Accruing	1,876	1,284
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	25,720	29,292
Other Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	38,932	13,796
Loans, Total Past Due	52,376	40,070
Loans, Current & Other	3,605,396	4,014,348
Loans and leases	3,657,772	4,054,418
Loans, Recorded Investment >90 Days & Accruing	1,028	1,001
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	13,444	26,274
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	19,763	32,743
Loans, Total Past Due	42,908	57,635
Loans, Current & Other	3,544,149	3,842,250
Loans and leases	3,587,057	3,899,885
Loans, Recorded Investment >90 Days & Accruing	8,361	8,574
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	23,145	24,892
Consumer [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	41	362
Loans, Total Past Due	230	518
Loans, Current & Other	7,710	8,419
Loans and leases	7,940	8,937
Loans, Recorded Investment >90 Days & Accruing	189	156
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	189	156
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	11,938	14,765
Loans, Total Past Due	14,039	17,522
Loans, Current & Other	1,154,865	1,175,058
Loans and leases	1,168,904	1,192,580
Loans, Recorded Investment >90 Days & Accruing	1,762	2,356
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	$ 2,101	$ 2,757

Credit Quality - Schedule of No

Credit Quality - Schedule of Nonaccrual Loans and Leases, Segregated by Class of Loans and Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	$ 73,653	$ 103,903
With No Related Allowance for Credit Losses	65,994	77,352
Recorded Investment > 90 Days & Accruing	14,181	13,832
Other Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	12,416	25,273
With No Related Allowance for Credit Losses	9,191	13,149
Recorded Investment > 90 Days & Accruing	1,028	1,001
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	14,784	16,318
With No Related Allowance for Credit Losses	13,790	14,769
Recorded Investment > 90 Days & Accruing	8,361	8,574
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	3,253	5,424
With No Related Allowance for Credit Losses	3,253	4,484
Recorded Investment > 90 Days & Accruing	133	461
Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	19,017	28,479
With No Related Allowance for Credit Losses	19,017	28,479
Recorded Investment > 90 Days & Accruing	832	0
Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	23,844	28,008
With No Related Allowance for Credit Losses	20,404	16,070
Recorded Investment > 90 Days & Accruing	1,876	1,284
Bankcard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	0	0
With No Related Allowance for Credit Losses	0	0
Recorded Investment > 90 Days & Accruing	189	156
Other Consumer [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccruals	339	401
With No Related Allowance for Credit Losses	339	401
Recorded Investment > 90 Days & Accruing	$ 1,762	$ 2,356

Credit Quality - Schedule of Am

Credit Quality - Schedule of Amortized Cost Loans and Leases Pledged As Collateral (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	$ 118,872	$ 157,869
Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	36,327	41,452
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	40,934	47,695
Other Commercial [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	16,600	28,456
Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	19,085	22,072
Construction & Land Development [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	5,926	18,193
Consumer [Member] | Bankcard [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Consumer [Member] | Other Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	1
Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	32,070	44,349
Residential Real Estate [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	1,480
Residential Real Estate [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	12,985	16,400
Residential Real Estate [Member] | Other Commercial [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	5,424
Residential Real Estate [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	19,085	21,006
Residential Real Estate [Member] | Construction & Land Development [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	39
Residential Real Estate [Member] | Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Business Assets Member [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	15,010	20,796
Business Assets Member [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	44	138
Business Assets Member [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Business Assets Member [Member] | Other Commercial [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	14,966	20,429
Business Assets Member [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	229
Business Assets Member [Member] | Construction & Land Development [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Business Assets Member [Member] | Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Land [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	7,210	20,340
Land [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Land [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	2,096	2,898
Land [Member] | Other Commercial [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Land [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	34
Land [Member] | Construction & Land Development [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	5,114	17,408
Land [Member] | Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Commercial Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	26,197	28,522
Commercial Real Estate [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	17,266	18,097
Commercial Real Estate [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	8,931	10,167
Commercial Real Estate [Member] | Other Commercial [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	258
Commercial Real Estate [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Commercial Real Estate [Member] | Construction & Land Development [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Commercial Real Estate [Member] | Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	0
Other Assets [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	38,385	43,862
Other Assets [Member] | Commercial Real Estate [Member] | Owner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	19,017	21,737
Other Assets [Member] | Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	16,922	18,230
Other Assets [Member] | Other Commercial [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	1,634	2,345
Other Assets [Member] | Residential Real Estate [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	0	803
Other Assets [Member] | Construction & Land Development [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	812	746
Other Assets [Member] | Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral	$ 0
Other Assets [Member] | Consumer [Member] | Bankcard [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral		0
Other Assets [Member] | Consumer [Member] | Other Consumer [Member]
Amortized cost collateral dependent loans [Line Items]
Amortized Cost Loans and Leases Pledged As Collateral		$ 1

Credit Quality - Schedule of Ri

Credit Quality - Schedule of Risk Category of Loans by Class of Loans and Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
Total	$ 10,228,699	$ 10,694,832
Owner-Occupied [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	97,374	282,714
2020	284,467	154,119
2019	154,398	165,799
2018	160,972	200,481
2017	180,405	288,015
Prior	684,552	507,790
Revolving loans amortized cost basis	26,855	23,167
Revolving loans converted to term loans	678	602
Total	1,589,701	1,622,687
Owner-Occupied [Member] | Pass [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	97,374	280,779
2020	284,405	152,851
2019	154,354	162,027
2018	158,806	198,610
2017	178,273	282,214
Prior	621,459	443,312
Revolving loans amortized cost basis	25,214	22,303
Revolving loans converted to term loans	426	0
Total	1,520,311	1,542,096
Owner-Occupied [Member] | Special Mention [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	1,206
2019	0	3,772
2018	2,166	754
2017	734	2,013
Prior	19,044	20,792
Revolving loans amortized cost basis	941	0
Revolving loans converted to term loans	0	453
Total	22,885	28,990
Owner-Occupied [Member] | Substandard [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	1,935
2020	62	62
2019	44	0
2018	0	1,117
2017	1,398	3,788
Prior	43,732	43,354
Revolving loans amortized cost basis	700	864
Revolving loans converted to term loans	252	149
Total	46,188	51,269
Owner-Occupied [Member] | Doubtful [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	317	332
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	317	332
Owner-Occupied [Member] | YTD Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	(44)	0
Prior	(166)	(2,195)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(210)	(2,195)
Owner-Occupied [Member] | YTD Recoveries [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	12	0
Prior	72	795
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	84	795
Owner-Occupied [Member] | YTD Net Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	(32)	0
Prior	(94)	(1,400)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(126)	(1,400)
Nonowner-Occupied [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	506,071	929,393
2020	896,562	711,833
2019	699,515	603,695
2018	515,955	483,849
2017	430,114	522,143
Prior	1,825,165	1,646,298
Revolving loans amortized cost basis	105,766	118,404
Revolving loans converted to term loans	2,078	2,112
Total	4,981,226	5,017,727
Nonowner-Occupied [Member] | Pass [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	506,071	929,001
2020	895,827	592,109
2019	571,698	596,260
2018	508,960	481,894
2017	428,608	502,417
Prior	1,663,763	1,496,135
Revolving loans amortized cost basis	105,766	118,404
Revolving loans converted to term loans	2,078	2,112
Total	4,682,771	4,718,332
Nonowner-Occupied [Member] | Special Mention [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	105,104
2019	114,003	0
2018	0	391
2017	382	8,902
Prior	68,707	78,591
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	183,092	192,988
Nonowner-Occupied [Member] | Substandard [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	392
2020	735	14,620
2019	13,814	7,435
2018	6,995	1,564
2017	1,124	10,824
Prior	92,695	71,572
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	115,363	106,407
Nonowner-Occupied [Member] | Doubtful [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Nonowner-Occupied [Member] | YTD Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	(38)
2020	0	0
2019	0	(300)
2018	0	0
2017	0	(3,394)
Prior	(3,101)	(2,402)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(3,101)	(6,134)
Nonowner-Occupied [Member] | YTD Recoveries [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	303	1,023
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	303	1,023
Nonowner-Occupied [Member] | YTD Net Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	(38)
2020	0	0
2019	0	(300)
2018	0	0
2017	0	(3,394)
Prior	(2,798)	(1,379)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(2,798)	(5,111)
Other Commercial Loans [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	758,898	1,704,769
2020	899,196	371,273
2019	354,661	207,583
2018	132,907	116,076
2017	98,236	126,322
Prior	139,110	296,312
Revolving loans amortized cost basis	1,272,150	1,228,969
Revolving loans converted to term loans	2,614	3,114
Total	3,657,772	4,054,418
Other Commercial Loans [Member] | Pass [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	758,865	1,702,787
2020	898,082	370,059
2019	353,707	200,588
2018	129,477	112,170
2017	96,778	119,582
Prior	112,242	257,638
Revolving loans amortized cost basis	1,214,646	1,172,699
Revolving loans converted to term loans	2,257	2,668
Total	3,566,054	3,938,191
Other Commercial Loans [Member] | Special Mention [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	25	333
2020	67	384
2019	147	4,754
2018	1,196	1,300
2017	1,003	138
Prior	4,852	8,231
Revolving loans amortized cost basis	41,972	40,048
Revolving loans converted to term loans	73	86
Total	49,335	55,274
Other Commercial Loans [Member] | Substandard [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	8	1,649
2020	1,047	830
2019	807	2,241
2018	2,234	2,606
2017	455	6,565
Prior	21,876	30,308
Revolving loans amortized cost basis	15,532	16,222
Revolving loans converted to term loans	284	360
Total	42,243	60,781
Other Commercial Loans [Member] | Doubtful [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	37
Prior	140	135
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	140	172
Other Commercial Loans [Member] | YTD Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	(31)	(959)
2018	(100)	(23)
2017	(6)	(3,525)
Prior	(2,447)	(12,843)
Revolving loans amortized cost basis	(40)	0
Revolving loans converted to term loans	0	0
Total	(2,624)	(17,350)
Other Commercial Loans [Member] | YTD Recoveries [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	94
2020	0	864
2019	14	18
2018	85	12
2017	16	684
Prior	1,714	2,789
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	1,829	4,461
Other Commercial Loans [Member] | YTD Net Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	94
2020	0	864
2019	(17)	(941)
2018	(15)	(11)
2017	10	(2,841)
Prior	(733)	(10,054)
Revolving loans amortized cost basis	(40)	0
Revolving loans converted to term loans	0	0
Total	(795)	(12,889)
Residential Portfolio Segment [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	395,401	603,714
2020	628,539	624,691
2019	476,644	640,975
2018	407,821	296,155
2017	224,416	288,388
Prior	1,045,901	1,003,782
Revolving loans amortized cost basis	405,177	437,729
Revolving loans converted to term loans	3,158	4,451
Total	3,587,057	3,899,885
Residential Portfolio Segment [Member] | Pass [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	395,401	603,714
2020	628,539	624,142
2019	475,986	640,535
2018	407,397	292,700
2017	221,041	282,547
Prior	1,019,262	975,913
Revolving loans amortized cost basis	404,177	436,728
Revolving loans converted to term loans	3,044	4,224
Total	3,554,847	3,860,503
Residential Portfolio Segment [Member] | Special Mention [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	267
2019	265	0
2018	0	192
2017	179	2,325
Prior	5,068	6,623
Revolving loans amortized cost basis	730	800
Revolving loans converted to term loans	0	0
Total	6,242	10,207
Residential Portfolio Segment [Member] | Substandard [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	282
2019	393	440
2018	424	3,263
2017	3,196	3,516
Prior	21,571	20,967
Revolving loans amortized cost basis	270	201
Revolving loans converted to term loans	114	227
Total	25,968	28,896
Residential Portfolio Segment [Member] | Doubtful [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	279
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	279
Residential Portfolio Segment [Member] | YTD Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	(30)	0
2018	0	0
2017	(116)	(1)
Prior	(5,260)	(1,759)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(5,406)	(1,760)
Residential Portfolio Segment [Member] | YTD Recoveries [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	101
2017	0	0
Prior	821	961
Revolving loans amortized cost basis	0	1
Revolving loans converted to term loans	0	0
Total	821	1,063
Residential Portfolio Segment [Member] | YTD Net Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	(30)	0
2018	0	101
2017	(116)	(1)
Prior	(4,439)	(798)
Revolving loans amortized cost basis	0	1
Revolving loans converted to term loans	0	0
Total	(4,585)	(697)
Construction Loans [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	283,262	420,977
2020	507,181	663,363
2019	501,582	310,803
2018	270,773	127,934
2017	93,555	83,468
Prior	103,413	72,632
Revolving loans amortized cost basis	169,286	147,172
Revolving loans converted to term loans	0	0
Total	1,929,052	1,826,349
Construction Loans [Member] | Pass [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	282,876	420,977
2020	507,181	663,113
2019	501,304	304,579
2018	267,413	127,377
2017	93,005	83,252
Prior	86,486	53,713
Revolving loans amortized cost basis	167,545	145,431
Revolving loans converted to term loans	0	0
Total	1,905,810	1,798,442
Construction Loans [Member] | Special Mention [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	4,689
2018	2,419	557
2017	550	0
Prior	1,221	1,420
Revolving loans amortized cost basis	995	995
Revolving loans converted to term loans	0	0
Total	5,185	7,661
Construction Loans [Member] | Substandard [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	386	0
2020	0	250
2019	278	1,535
2018	941	0
2017	0	216
Prior	15,706	17,499
Revolving loans amortized cost basis	746	746
Revolving loans converted to term loans	0	0
Total	18,057	20,246
Construction Loans [Member] | Doubtful [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Construction Loans [Member] | YTD Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	(255)	(2,027)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(255)	(2,027)
Construction Loans [Member] | YTD Recoveries [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	48	1,513
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	48	1,513
Construction Loans [Member] | YTD Net Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	(207)	(514)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(207)	(514)
Bankcard [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	7,940	8,937
Revolving loans converted to term loans	0	0
Total	7,940	8,937
Bankcard [Member] | Pass [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	7,710	8,419
Revolving loans converted to term loans	0	0
Total	7,710	8,419
Bankcard [Member] | Special Mention [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	41	362
Revolving loans converted to term loans	0	0
Total	41	362
Bankcard [Member] | Substandard [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	189	156
Revolving loans converted to term loans	0	0
Total	189	156
Bankcard [Member] | Doubtful [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Bankcard [Member] | YTD Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	(106)	(221)
Revolving loans converted to term loans	0	0
Total	(106)	(221)
Bankcard [Member] | YTD Recoveries [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	30	52
Revolving loans converted to term loans	0	0
Total	30	52
Bankcard [Member] | YTD Net Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	0
Revolving loans amortized cost basis	(76)	(169)
Revolving loans converted to term loans	0	0
Total	(76)	(169)
Other Consumer [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	241,796	419,771
2020	380,846	401,958
2019	311,882	231,172
2018	170,348	74,550
2017	48,919	34,435
Prior	12,095	24,582
Revolving loans amortized cost basis	3,018	6,112
Revolving loans converted to term loans	0	0
Total	1,168,904	1,192,580
Other Consumer [Member] | Pass [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	241,796	419,768
2020	380,844	401,958
2019	311,882	231,172
2018	170,348	74,550
2017	48,919	34,435
Prior	12,089	7,466
Revolving loans amortized cost basis	3,017	6,110
Revolving loans converted to term loans	0	0
Total	1,168,895	1,175,459
Other Consumer [Member] | Special Mention [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	6	14,763
Revolving loans amortized cost basis	1	2
Revolving loans converted to term loans	0	0
Total	7	14,765
Other Consumer [Member] | Substandard [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	3
2020	2	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	2,352
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	2	2,355
Other Consumer [Member] | Doubtful [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017	0	0
Prior	0	1
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	1
Other Consumer [Member] | YTD Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	(136)
2020	(395)	(1,013)
2019	(505)	(1,040)
2018	(263)	(393)
2017	(80)	(228)
Prior	(136)	(484)
Revolving loans amortized cost basis	(7)	(2)
Revolving loans converted to term loans	0	0
Total	(1,386)	(3,296)
Other Consumer [Member] | YTD Recoveries [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	3
2020	34	74
2019	25	113
2018	38	30
2017	8	43
Prior	103	216
Revolving loans amortized cost basis	2	0
Revolving loans converted to term loans	0	0
Total	210	479
Other Consumer [Member] | YTD Net Charge Offs [Member]
Disclosure Details Of Troubled Debt Restructuring Loan Modification Based On Post Modification Outstanding Balance [Line Items]
2021	0	(133)
2020	(361)	(939)
2019	(480)	(927)
2018	(225)	(363)
2017	(72)	(185)
Prior	(33)	(268)
Revolving loans amortized cost basis	(5)	(2)
Revolving loans converted to term loans	0	0
Total	$ (1,176)	$ (2,817)

Allowance for Credit Losses - A

Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Reserve for lending-related commitments	$ 20,897	$ 19,250
Maximum Period Related To Accrual Of Interest On Discontinued Loans	90 days
Accrued interest receivable	$ 48,588	56,393
Accrued interest receivable net of allowance for credit loss	60,877	66,832
Financing receivable, allowance for credit losses	29	250
American Rescue Plan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Consideration given as a rescue plan	1,900,000,000
Accrued Income Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Accrued interest receivable		$ 56,143
Accrued interest receivable net of allowance for credit loss	$ 48,559

Allowance for Credit Losses - S

Allowance for Credit Losses - Schedule Of Credit Losses Related To Accrued Interest Receivables (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	$ 48,588	$ 56,393
Less: Allowance for credit losses	(29)	(250)
Total	48,559	56,143
Construction [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	6,693	7,314
Commercial Real Estate [Member] | Owner-Occupied [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	3,823	5,001
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	13,671	15,989
Other Commercial [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	11,678	12,320
Residential Real Estate [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	9,730	12,558
Consumer [Member] | Bankcard [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	0	0
Consumer [Member] | Other Consumer [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivable	$ 2,993	$ 3,211

Allowance for Credit Losses -_2

Allowance for Credit Losses - Schedule of Accrued Interest Receivables Written off by Reversing Interest (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	$ 80	$ 245	$ 215	$ 391
Construction & land development [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	0	0	0	0
Commercial real estate [Member] | Owner-Occupied [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	11	83	12	100
Commercial real estate [Member] | Nonowner-Occupied [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	4	38	40	45
Other commercial [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	2	33	8	45
Residential real estate [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	21	64	49	134
Consumer [Member] | Bankcard [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	0	0	0	0
Consumer [Member] | Other Consumer [Member]
Accrued Interest Receivables and Written off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	$ 42	$ 27	$ 106	$ 67

Allowance for Credit Losses -_3

Allowance for Credit Losses - Schedule of Allowance for Loan Losses and Carrying Amount of Loans and Leases (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance	$ 231,582	$ 235,830	$ 77,057
Initial allowance for PCD loans (acquired during the period)			18,635
Charge-offs	(6,131)	(13,088)	(32,983)
Recoveries	910	3,325	9,386
Provision	(8,816)	(8,522)	106,293
Allowance for Loan and Lease Losses Ending balance	217,545	217,545	235,830
Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance			52,321
Accounting Standards Update 2016-13 [Member] | PCD loans Member [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance			5,121
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance	38,329	39,077	3,353
Initial allowance for PCD loans (acquired during the period)			2,570
Charge-offs	(119)	(255)	(2,027)
Recoveries	4	48	1,513
Provision	(3,067)	(3,723)	16,806
Allowance for Loan and Lease Losses Ending balance	35,147	35,147	39,077
Construction & Land Development [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning 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 and Lease Losses Beginning balance			2,045
Bankcard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance	271	322	74
Initial allowance for PCD loans (acquired during the period)			0
Charge-offs	(71)	(106)	(221)
Recoveries	24	30	52
Provision	30	8	389
Allowance for Loan and Lease Losses Ending balance	254	254	322
Bankcard [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning 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 and Lease Losses Beginning balance			0
Allowance for Estimated Imprecision [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance	0	0	297
Initial allowance for PCD loans (acquired during the period)			0
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	0	0	0
Allowance for Loan and Lease Losses Ending balance	0	0	0
Allowance for Estimated Imprecision [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning 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 and Lease Losses Beginning balance			0
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance	21,074	23,354	5,554
Initial allowance for PCD loans (acquired during the period)			1,955
Charge-offs	(67)	(210)	(2,195)
Recoveries	78	84	795
Provision	(1,782)	(3,925)	5,665
Allowance for Loan and Lease Losses Ending balance	19,303	19,303	23,354
Commercial Real Estate [Member] | Owner-Occupied [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning 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 and Lease Losses Beginning balance			1,843
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance	47,902	49,150	8,524
Initial allowance for PCD loans (acquired during the period)			6,418
Charge-offs	0	(3,101)	(6,134)
Recoveries	50	303	1,023
Provision	(5,906)	(4,306)	30,175
Allowance for Loan and Lease Losses Ending balance	42,046	42,046	49,150
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning 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 and Lease Losses Beginning balance			121
Other Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance	84,504	78,138	47,325
Initial allowance for PCD loans (acquired during the period)			7,032
Charge-offs	(1)	(2,624)	(17,350)
Recoveries	482	1,829	4,461
Provision	(5,104)	2,538	40,561
Allowance for Loan and Lease Losses Ending balance	79,881	79,881	78,138
Other Commercial [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning 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 and Lease Losses Beginning balance			938
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance	24,991	29,125	8,997
Initial allowance for PCD loans (acquired during the period)			652
Charge-offs	(5,193)	(5,406)	(1,760)
Recoveries	168	821	1,063
Provision	6,085	1,511	6,902
Allowance for Loan and Lease Losses Ending balance	26,051	26,051	29,125
Residential Real Estate [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning 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 and Lease Losses Beginning balance			174
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning balance	14,511	16,664	2,933
Initial allowance for PCD loans (acquired during the period)			8
Charge-offs	(680)	(1,386)	(3,296)
Recoveries	104	210	479
Provision	928	(625)	5,795
Allowance for Loan and Lease Losses Ending balance	$ 14,863	$ 14,863	16,664
Other Consumer [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses Beginning 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 and Lease Losses Beginning balance			$ 0

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,276	$ 1,276
Goodwill not subject to amortization	1,810,040	1,796,848
Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,767	101,767
Accumulated Amortization	(79,053)	(76,120)
George Mason Trade Name Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,080	1,080
Crescent Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	196	196
Community Banking [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	0
Goodwill not subject to amortization	1,804,725	1,791,533
Community Banking [Member] | Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101,767	101,767
Accumulated Amortization	(79,053)	(76,120)
Community Banking [Member] | George Mason Trade Name Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	0
Community Banking [Member] | Crescent Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	0
Mortgage Banking [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,276	1,276
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 Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 196	$ 196

Intangible Assets - Reconciliat

Intangible Assets - Reconciliation of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Goodwill [Line Items]
Goodwill at December 31, 2020	$ 1,796,848
Preliminary addition to goodwill from Carolina Financial acquisition	13,192
Goodwill at June 30, 2021	1,810,040
Community Banking [Member]
Goodwill [Line Items]
Goodwill at December 31, 2020	1,791,533
Preliminary addition to goodwill from Carolina Financial acquisition	13,192
Goodwill at June 30, 2021	1,804,725
Mortgage Banking [Member]
Goodwill [Line Items]
Goodwill at December 31, 2020	5,315
Preliminary addition to goodwill from Carolina Financial acquisition	0
Goodwill at June 30, 2021	$ 5,315

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Amortization expense on intangible assets	$ 1,467	$ 1,646	$ 2,933	$ 3,223
Goodwill acquired during period			$ 13,192

Intangible Assets - Schedule of

Intangible Assets - Schedule of Anticipated Amortization Expense (Detail) $ in Thousands	Dec. 31, 2020USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2021	$ 5,866
2022	4,983
2023	4,680
2024	3,255
2025	2,942
2026 and thereafter	$ 3,921

Mortgage Servicing Rights - Add

Mortgage Servicing Rights - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]
Estimated fair value of mortgage servicing rights	$ 22,540		$ 22,540		$ 20,955
Temporary impairment charge of mortgage servicing rights	(629)	$ (710)	(629)	$ (710)
Temporary impairment, net of recoveries	(250)		(250)
Mortgage servicing rights			20,123
Mortgage Servicing Rights [Member]
Servicing Assets at Fair Value [Line Items]
Loans serviced for others unpaid principal balance	$ 3,674,023		$ 3,674,023		$ 3,587,953
Net servicing fee percentage	0.26%		0.26%		0.26%
Temporary impairment, net of recoveries			$ (250)		$ (1,383)
Mortgage servicing rights	$ 0	$ 20,123	$ 0	$ 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%		9.50%
Weighted average prepayment rates used in estimating the fair value of servicing rights			10.61%		10.62%
Deliquency rate used in determning fair value of servicing rights			11.29%		7.98%
Mortgage Servicing Rights [Member] | Maximum [Member]
Servicing Assets at Fair Value [Line Items]
Discount rate used in estimating the fair value of servicing rights			12.00%		14.07%
Weighted average prepayment rates used in estimating the fair value of servicing rights			17.53%		14.60%
Deliquency rate used in determning fair value of servicing rights			22.83%		18.42%
Mortgage Servicing Rights [Member] | Weighted Average [Member] | Including Loans On Forbearance [Member]
Servicing Assets at Fair Value [Line Items]
Deliquency rate used in determning fair value of servicing rights			2.76%		2.88%
Mortgage Servicing Rights [Member] | Loan Origination Commitments [Member] | Median [Member]
Servicing Assets at Fair Value [Line Items]
Estimated fair value of mortgage servicing rights	$ 24,630		$ 24,630		$ 20,955

Mortgage Servicing Rights - Sum

Mortgage Servicing Rights - Summary of Activity in Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Servicing Asset at Amortized Cost [Line Items]
Addition from acquisition of subsidiary			$ 20,123
MSRs valuation allowance beginning balance	$ (1,383)	$ 0	(1,383)	$ 0
Aggregate additions charged and recoveries credited to operations	379	0	379	0
MSRs impairment	(629)	(710)	(629)	(710)
MSRs valuation allowance ending balance	(1,633)	(710)	(1,633)	(710)
MSRs, net of valuation allowance	22,540	20,200	22,540	20,200
Mortgage Servicing Rights [Member]
Servicing Asset at Amortized Cost [Line Items]
MSRs beginning balance	23,401	0	22,338	0
Addition from acquisition of subsidiary	0	20,123	0	20,123
Amount capitalized	3,111	1,891	6,335	1,891
Amount amortized	(2,339)	(1,104)	(4,500)	(1,104)
MSRs ending balance	$ 24,173	$ 20,910	$ 24,173	$ 20,910

Leases - Additional Information

Leases - Additional Information (Detail)	Jun. 30, 2021
Operating leases, option to extend term	5 years
Maximum [Member]
Operating lease remaining lease term	12 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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating lease cost	$ 5,328	$ 5,895	$ 10,677	$ 10,961
Sublease income	(358)	(189)	(655)	(394)
Net lease cost	$ 4,970	$ 5,706	$ 10,022	$ 10,567

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Operating lease right-of-use assets	$ 66,635	$ 69,520
Operating lease liabilities	$ 70,546	$ 73,213

Leases - Other Information Rela

Leases - Other Information Related to Leases (Detail)	Jun. 30, 2021
Weightedaverage remaining lease term [Abstract]
Operating leases	5 years 9 months 18 days
Weightedaverage discount rate [Abstract]
Operating leases	2.37%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash paid for amounts in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases	$ 5,581	$ 5,722	$ 11,027	$ 10,739
ROU assets obtained in the exchange for lease liabilities	$ 1,839	$ 8,549	$ 6,282	$ 12,332

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities by Year (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
2021	$ 10,221	$ 20,172
2022	17,074	16,196
2023	13,616	12,723
2024	9,096	8,242
2025	6,362	5,516
Thereafter	18,842	15,330
Total lease payments	75,211	78,179
Less: imputed interest	(4,665)	(4,966)
Total	$ 70,546	$ 73,213

Short-Term Borrowings - Additio

Short-Term Borrowings - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2021USD ($)
Short-term Debt [Line Items]
Unused lines of credit	$ 230,000
Federal funds purchased	0
Repurchase agreements	127,745
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)	6 Months Ended
	Jun. 30, 2021USD ($)Trust	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Unused borrowing amount	$ 7,005,031
Outstanding balances of debentures	$ 270,792	$ 269,972
Maximum time to defer payment of interest on subordinate debt	5 years
Advances from Federal Home Loan Banks	$ 533,365,000	584,532,000
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year	0.34%
Number of statutory business trusts | Trust	19
Debt, Weighted Average Interest Rate	0.55%
Capital Securities [member]
Debt Instrument [Line Items]
Outstanding balances of debentures	$ 9,865	$ 9,865
Number of statutory business trusts | Trust	19

Long -Term Borrowings - Schedul

Long -Term Borrowings - Schedule of Maturities of Long-term Borrowings (Detail) $ in Thousands	Jun. 30, 2021USD ($)
Debt Disclosure [Abstract]
2021	$ 500,000
2022	22,159
2023	0
2024	0
2025 and thereafter	11,206
Total	$ 533,365

Commitments and Contingent Li_2

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Loan commitments outstanding	$ 6,368,974	$ 5,730,876
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	$ 1,209	1,216
Commitments to Extend Credit [Member] | George Mason [Member] | Short-term Contract with Customer [Member]
Loss Contingencies [Line Items]
Additional commitments to extend credit	597,304
Commercial Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	3,055	5,092
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	$ 151,289	$ 134,916

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Derivative liabilities notional amount	$ 819,154		$ 866,011
Interest Rate Cash Flow Hedge [Member]
Derivative [Line Items]
Derivative liabilities notional amount	500,000
Federal Home Loan Bank Borrowings [Member]
Derivative [Line Items]
Fair value of interest rate swaps liability net	0
Federal Home Loan Bank Borrowings [Member] | Interest Rate Cash Flow Hedge [Member]
Derivative [Line Items]
Derivative liabilities notional amount	$ 250,000	$ 250,000
Derivative instrument pay fixed rate of interest and receive floating rate	0.19%	0.59%
Derivative instrument term of the interest rate swap	4 years	10 years
Cash flow hedge reclassification amount to be reclassified from aoci to income in the next twelve months	$ 1,352

Derivative Financial Instrume_4

Derivative Financial Instruments - Schedule of Notional Amount and Fair Value Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Asset derivatives, notional amount	$ 1,334,036	$ 1,535,768
Liability derivatives, notional amount	819,154	866,011
Total asset derivatives	34,317	44,291
Total liability derivatives	6,601	13,058
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	500,000	500,000
Asset derivatives designated as hedging instruments	16,037	4,378
Liability derivatives, notional amount	74,748	77,011
Liability derivatives designated as hedging instruments	4,484	6,782
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	834,036	1,035,768
Liability derivatives, notional amount	744,406	789,000
Asset derivatives not designated as hedging instruments	18,280	39,913
Liability derivatives not designated as hedging instruments	2,117	6,276
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability derivatives, notional amount	74,748	77,011
Liability derivatives designated as hedging instruments	4,484	6,782
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	500,000	500,000
Asset derivatives designated as hedging instruments	16,037	4,378
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Asset derivatives, notional amount	703,161	973,350
Asset derivatives not designated as hedging instruments	17,438	38,332
Other Liabilities [Member] | TBA Mortgage Backed Securities [Member]
Derivative [Line Items]
Liability derivatives, notional amount		6,276
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] | TBA Mortgage Backed Securities [Member]
Derivative [Line Items]
Liability derivatives, notional amount	684,000	789,000
Interest Rate Contracts [Member] | Other Assets [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Hedged Commercial Loans Federal Home Loan Bank [Member]
Derivative [Line Items]
Asset derivatives, notional amount	500,000	500,000
Asset derivatives designated as hedging instruments	16,037	4,378
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	74,748	77,011
Liability derivatives designated as hedging instruments	4,484	6,782
TBA Mortgage Backed Securities [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	98,709	0
Asset derivatives not designated as hedging instruments	296	0
TBA Mortgage Backed Securities [Member] | Other Liabilities [Member]
Derivative [Line Items]
Liability derivatives, notional amount	1,868
Forward Loan Sale Commitments [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	32,166	62,418
Asset derivatives not designated as hedging instruments	546	1,581
Forward Loan Sale Commitments [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability derivatives, notional amount	60,406	0
Liability derivatives not designated as hedging instruments	$ 249	$ 0

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 And Leases Net Of Unearned Income [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Carrying Amount of the Hedged Assets/(Liabilities)	$ 75,523	$ 77,810
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	(4,484)	(6,782)
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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative [Line Items]
Derivatives in hedging relationships	$ (27,670)	$ 14,847	$ (13,946)	$ 9,885
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivatives in hedging relationships	(921)	(277)	(1,379)	(720)
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	(558)	(277)	(793)	(720)
Designated as Hedging Instrument [Member] | Interest On Long Term Borrowings [Member] | Interest Rate Contracts [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives in hedging relationships	(363)	0	(586)	0
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivatives not designated as hedging instruments	(26,749)	15,124	(12,567)	10,605
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	(19,459)	17,204	4,704	(1,771)
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	(8,996)	(1,527)	(15,987)	12,169
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	$ 1,706	$ (553)	$ (1,284)	$ 207

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers from Level 1 to Level 3 for financial assets	$ 0		$ 0		$ 0
Transfers from Level 3 to Level 1 for financial assets	0		0		0
Transfers from Level 2 to Level 3 for financial assets	0		0		0
Transfers from Level 3 to Level 2 for financial assets	0		0		0
Transfers from Level 1 to Level 3 for financial liabilities	0		0		0
Transfers from Level 3 to Level 1 for financial liabilities	0		0		0
Transfers from Level 2 to Level 3 for financial liabilities	0		0		0
Transfers from Level 3 to Level 2 for financial liabilities	0		0		0
Temporary impairment charge of mortgage servicing rights	(629,000)	$ (710,000)	(629,000)	$ (710,000)
Temporary impairment, net of recoveries	(250,000)		(250,000)
Fair value measurement of intangible assets	0	$ 0	0	$ 0
Transfers from Level 1 to Level 2 for financial liabilities	$ 0		0		0
Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Temporary impairment, net of recoveries			$ (250,000)		$ (1,383,000)
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%		9.50%
Average range of constant prepayment rates			10.61%		10.62%
Deliquency rate used in determning fair value of servicing rights			11.29%		7.98%
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%		9.50%
Average range of constant prepayment rates			11.29%		7.98%
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			12.00%		14.07%
Average range of constant prepayment rates			17.53%		14.60%
Deliquency rate used in determning fair value of servicing rights			22.83%		18.42%
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			12.00%		14.07%
Average range of constant prepayment rates			22.83%		18.42%
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			10.61%		10.62%
Average range of constant prepayment rates			17.53%		14.60%
Deliquency rate used in determning fair value of servicing rights			2.76%		2.88%
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	0.11%		0.11%
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	0.31%		0.31%
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	0.21%		0.21%
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	0.11%		0.11%
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	0.31%		0.31%
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	0.21%		0.21%

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	$ 576,827	$ 718,937
Derivative financial assets	34,317	44,291
Derivative financial liabilities	6,601	13,058
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	3,277,074	2,953,359
Available for sale equity securities	11,507	10,718
Loans held for sale	576,827	698,341
Derivative financial assets	34,317	44,291
Derivative financial liabilities	6,601	13,058
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	15,147	66,344
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	614,046	565,160
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	985,002	928,891
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	39,603	21,776
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	652,557	675,145
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	489,433	294,623
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	17,417	17,027
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	463,869	384,393
Financial Services Industry [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	169	134
Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	5,893	5,982
Forward Sales Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	546	1,581
Derivative financial liabilities	249
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	17,438	38,332
TBA Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	296	0
Derivative financial liabilities	1,868	6,276
Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	16,037	4,378
Derivative financial liabilities	4,484	6,782
Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	5,445	4,602
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	5,983	6,207
Available for sale equity securities	11,507	10,718
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] | 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	5,983	6,207
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	169	134
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	5,893	5,982
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
Derivative financial liabilities	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	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 assets	0	0
Derivative financial liabilities	0	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	0
Derivative financial liabilities	0	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	5,445	4,602
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	44,553	64,204
Derivative financial assets	19,471	12,280
Derivative financial liabilities	4,608	13,058
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	3,271,091	2,947,152
Available for sale equity securities	0	0
Loans held for sale	44,553	43,608
Derivative financial assets	19,471	12,280
Derivative financial liabilities	4,608	13,058
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	15,147	66,344
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	614,046	565,160
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	985,002	928,891
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	39,603	21,776
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	652,557	675,145
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	489,433	294,623
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	17,417	17,027
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	457,886	378,186
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	546	1,581
Derivative financial liabilities	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	2,888	6,321
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 assets	0	0
Derivative financial liabilities	124	6,276
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	16,037	4,378
Derivative financial liabilities	4,484	6,782
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	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	532,274	654,733
Derivative financial assets	14,846	32,011
Derivative financial liabilities	1,993	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	0	0
Available for sale equity securities	0	0
Loans held for sale	532,274	654,733
Derivative financial assets	14,846	32,011
Derivative financial liabilities	1,993	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] | 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	0
Derivative financial liabilities	249
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	14,550	32,011
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 assets	296	0
Derivative financial liabilities	1,744	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	0
Derivative financial liabilities	0	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	$ 0	$ 0

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, 2021	Dec. 31, 2020
Loans Held For Sale [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	$ 654,733	$ 384,375
Originations	2,888,337	5,699,581
Sales	(3,090,988)	(5,652,693)
Included in earnings (or changes in net assets)	80,192	223,470
Transfers in and/or out of Level 3	0	0
Balance, end of period	532,274	654,733
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 TBA Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	0	0
Transfers in and/or out of Level 3	296	0
Balance, end of period	296	0
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	32,011	4,518
Transfers in and/or out of Level 3	(17,461)	27,493
Balance, end of period	14,550	32,011
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
Forward Sales Commitments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	0	0
Transfers in and/or out of Level 3	249	0
Balance, end of period	249	0
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 Liabilities TBA Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	0	0
Transfers in and/or out of Level 3	1,744	0
Balance, end of period	1,744	0
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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Mortgage Banking [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Income from mortgage banking activities	$ 6,075	$ 8,846	$ (11,776)	$ 10,471

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, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Loans held for sale, unpaid principal balance	$ 562,200	$ 672,458
Loans held for sale, fair value	576,827	698,341
Loans held for sale, fair value over/(under) unpaid principal balance	$ 14,627	$ 25,883

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
YTD Losses, Loans held for sale			$ (197)
YTD Losses, Individually assessed loans		$ (1,430)	1,318
YTD Losses, OREO		(3,528)	(1,618)
YTD Losses, Mortgage servicing rights	$ (250)	(250)
Loans held for sale	576,827	576,827	698,341
OREO	18,474	18,474	22,595
Mortgage servicing rights	22,540	22,540		$ 20,200
Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
YTD Losses, Mortgage servicing rights		(250)	(1,383)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale			20,596
Individually assessed loans	17,893	17,893	37,498
OREO	18,474	18,474	22,595
Fair Value, Measurements, Nonrecurring [Member] | Mortgage Servicing Rights [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage servicing rights	24,630	24,630	20,955
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
Individually assessed loans	0	0	0
OREO	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			20,596
Individually assessed loans	13,591	13,591	14,467
OREO	18,474	18,474	22,595
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
Individually assessed loans	4,302	4,302	23,031
OREO	0	0	0
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	$ 24,630	$ 24,630	$ 20,955

Fair Value Measurements - Sum_3

Fair Value Measurements - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 3,677,396	$ 2,209,068	$ 2,062,813	$ 837,493
Securities available for sale	3,277,074	2,953,359
Securities held to maturity	989	1,212
Other securities	221,931	220,895
Loans held for sale	576,827	718,937
Net loans and leases	16,888,001	17,591,413
Derivative financial assets	34,317	44,291
Mortgage servicing rights	22,540	20,955
Deposits	21,567,391	20,585,160
Derivative financial liabilities	6,601	13,058
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3,677,396	2,209,068
Securities available for sale	3,277,074	2,953,359
Securities held to maturity	989	1,212
Other securities	221,931	220,895
Loans held for sale	576,827	718,937
Net loans and leases	16,670,456	17,355,583
Derivative financial assets	34,317	44,291
Mortgage servicing rights	22,540	20,955
Deposits	21,567,391	20,585,160
Short-term borrowings	127,745	142,300
Long-term borrowings	814,022	864,369
Derivative financial liabilities	6,601	13,058
Carrying Amount [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	11,507	10,718
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3,677,396	2,209,068
Securities available for sale	3,277,074	2,953,359
Securities held to maturity	1,020	1,235
Other securities	210,834	209,850
Loans held for sale	576,827	718,937
Net loans and leases	16,153,015	16,559,797
Derivative financial assets	34,317	44,291
Mortgage servicing rights	24,630	20,955
Deposits	21,555,714	20,583,607
Short-term borrowings	127,745	142,300
Long-term borrowings	768,278	815,991
Derivative financial liabilities	6,601	13,058
Fair Value [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	11,507	10,718
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	5,983	6,207
Securities held to maturity	0	0
Other securities	0	0
Loans held for sale	0	0
Net loans and leases	0	0
Derivative financial assets	0	0
Mortgage servicing rights	0	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	11,507	10,718
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3,677,396	2,209,068
Securities available for sale	3,271,091	2,947,152
Securities held to maturity	0	215
Other securities	0	0
Loans held for sale	44,553	64,204
Net loans and leases	0	0
Derivative financial assets	19,471	12,280
Mortgage servicing rights	0	0
Deposits	21,555,714	20,583,607
Short-term borrowings	127,745	142,300
Long-term borrowings	768,278	815,991
Derivative financial liabilities	4,608	13,058
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	0	0
Securities held to maturity	1,020	1,020
Other securities	210,834	209,850
Loans held for sale	532,274	654,733
Net loans and leases	16,153,015	16,559,797
Derivative financial assets	14,846	32,011
Mortgage servicing rights	24,630	20,955
Deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Derivative financial liabilities	1,993	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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	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					225,000
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	$ 1,892	$ 1,369	$ 3,580	$ 2,622
Maximum term for awards granted (years)			10 years
Shares issued related stock option exercises			173,945	14,994
Total intrinsic value of options exercised			$ 1,644	$ 249
Number of share available for grant for prior plans	0		0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 days

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Stock Option Plans (Detail) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)$ / sharesshares	Jun. 30, 2020shares
Disclosure Stock Based Compensation Stock Option Plan [Abstract]
Shares, Outstanding, Beginning balance | shares	1,904,557
Shares, Granted | shares	49,978
Shares, Exercised | shares	(173,945)	(14,994)
Shares, Forfeited or expired | shares	(110,229)
Shares, Outstanding, Ending balance | shares	1,670,361
Shares, Exercisable at June 30, 2021 | shares	1,315,307
Aggregate Intrinsic Value, Outstanding at June 30, 2021 | $	$ 5,358
Aggregate Intrinsic Value, Exercisable at June 30, 2021 | $	$ 4,654
Weighted Average Remaining Contractual Term, Outstanding at June 30, 2021	5 years 3 months 18 days
Weighted Average Remaining Contractual Term, Exercisable at June 30, 2021	4 years 9 months 18 days
Weighted Average Exercise Price, Outstanding, Beginning balance | $ / shares	$ 34.14
Weighted Average Exercise Price, Granted | $ / shares	32.51
Weighted Average Exercise Price, Exercised | $ / shares	28.65
Weighted Average Exercise Price, Forfeited or expired | $ / shares	28.69
Weighted Average Exercise Price, Outstanding, Ending balance | $ / shares	35.02
Weighted Average Exercise Price, Exercisable | $ / shares	$ 34.91

Stock Based Compensation - Stat

Stock Based Compensation - Status of United's Nonvested Stock Option Awards (Detail)	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Stock Based Compensation [Line Items]
Shares, Nonvested, Beginning balance | shares	544,905
Shares, Granted | shares	49,978
Shares, Vested | shares	(239,659)
Shares, Forfeited or expired | shares	(170)
Shares, Nonvested, Ending balance | shares	355,054
Weighted-Average Grant Date Fair Value Per Share, Nonvested Beginning balance | $ / shares	$ 6.93
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	5.65
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	7.32
Weighted-Average Grant Date Fair Value Per Share, Forfeited or expired | $ / shares	5.65
Weighted-Average Grant Date Fair Value Per Share, Nonvested Ending balance | $ / shares	$ 6.49
Restricted Stock Units (RSUs) [Member]
Stock Based Compensation [Line Items]
Shares, Nonvested, Beginning balance | shares	0
Shares, Granted | shares	136,896
Shares, Vested | shares	0
Shares, Forfeited or expired | shares	0
Shares, Nonvested, Ending balance | shares	136,896
Weighted-Average Grant Date Fair Value Per Share, Nonvested Beginning balance | $ / shares	$ 0
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	35.65
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	0
Weighted-Average Grant Date Fair Value Per Share, Forfeited or expired | $ / shares	0
Weighted-Average Grant Date Fair Value Per Share, Nonvested Ending balance | $ / shares	$ 35.65

Stock Based Compensation - Chan

Stock Based Compensation - Changes to United's Restricted Common Shares (Detail) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning balance | shares	340,976
Shares, Granted | shares	182,344
Shares, Vested | shares	(129,061)
Shares, Forfeited | shares	(1,971)
Number of Shares, Outstanding, Ending balance | shares	392,288
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Beginning balance | $ / shares	$ 35.41
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	35.97
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	36.90
Weighted-Average Grant Date Fair Value Per Share, Forfeited | $ / shares	36.70
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Ending balance | $ / shares	$ 35.18

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial gains (losses), before tax			$ 65,426
Amortization expected to be recognized, net of tax			$ 50,182
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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 758	$ 715	$ 1,508	$ 1,430
Interest cost	1,031	1,286	2,051	2,573
Expected return on plan assets	(2,957)	(2,630)	(5,881)	(5,259)
Recognized net actuarial loss	1,589	1,442	3,161	2,884
Net periodic pension cost	$ 421	$ 813	$ 839	$ 1,628
Weighted-average assumptions:
Discount rate	2.81%	3.42%	2.81%	3.42%
Expected return on assets	6.25%	6.75%	6.25%	6.75%
Prior to Age 40 [Member]
Weighted-average assumptions:
Rate of compensation increase	5.00%	5.00%	5.00%	5.00%
Ages 40 to 54 [Member]
Weighted-average assumptions:
Rate of compensation increase	4.00%	4.00%	4.00%	4.00%
Otherwise [Member]
Weighted-average assumptions:
Rate of compensation increase	3.50%	3.50%	3.50%	3.50%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Taxes [Line Items]
Accrued interest related to uncertain tax positions	$ 722	$ 718	$ 722	$ 718
Effective tax rate	20.50%	17.30%	20.50%	18.38%

Comprehensive Income - Componen

Comprehensive Income - Components of Total Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net Income	$ 94,836	$ 106,898	$ 52,686	$ 40,183	$ 201,734	$ 92,869
Change in net unrealized gain on AFS securities arising during the period	18,040		37,756		(27,927)	60,859
Related income tax effect	(4,203)		(8,797)		6,507	(14,180)
Net reclassification adjustment for gains included in net income	0		(1,466)		(1,444)	(1,641)
Related income tax expense	0		341		336	382
Net effect of AFS securities on other comprehensive income	13,837		27,834		(22,528)	45,420
Cash flow hedge derivatives:
Unrealized gain on cash flow hedge before reclassification to interest expense	(8,243)		(1,659)		11,074	(1,659)
Related income tax effect	1,921		387		(2,580)	387
Net reclassification adjustment for losses included in net income	363		0		586	0
Related income tax effect	(85)		0		(137)	0
Net effect of cash flow hedge derivatives on other comprehensive income	(6,044)		(1,272)		8,943	(1,272)
Pension plan:
Recognized net actuarial loss	1,589		1,442		3,161	2,884
Related income tax benefit	(720)		(329)		(1,423)	(659)
Net effect of change in pension plan asset on other comprehensive income	869		1,113		1,738	2,225
Other comprehensive income, net of tax	8,662	(20,509)	27,675	18,698	(11,847)	46,373
Total Comprehensive Income	$ 103,498	$ 86,389	$ 80,361	$ 58,881	$ 189,887	$ 139,242

Comprehensive Income - Compon_2

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands		3 Months Ended						6 Months Ended
		Jun. 30, 2021		Mar. 31, 2021		Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021		Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ 4,332,698		$ 4,297,620		$ 3,343,702	$ 3,363,833	$ 4,297,620		$ 3,363,833
Net current-period other comprehensive income, net of tax		8,662		(20,509)		27,675	18,698	(11,847)		46,373
Ending Balance		4,393,713		4,332,698		4,197,855	3,343,702	4,393,713		4,197,855
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]			(46,193)				(46,193)
Other comprehensive income before reclassification	[1]							0
Amounts reclassified from accumulated other comprehensive income	[1]							1,738
Net current-period other comprehensive income, net of tax	[1]							1,738
Ending Balance	[1]	(44,455)						(44,455)
Unrealized Gains/Losses on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]			65,205				65,205
Other comprehensive income before reclassification	[1]							(21,420)
Amounts reclassified from accumulated other comprehensive income	[1]							(1,108)
Net current-period other comprehensive income, net of tax	[1]							(22,528)
Ending Balance	[1]	42,677						42,677
Accumulated Gain (Loss) Net Cash Flow Hedge Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]			3,358				3,358
Other comprehensive income before reclassification	[1]							8,494
Amounts reclassified from accumulated other comprehensive income	[1]							449
Net current-period other comprehensive income, net of tax	[1]							8,943
Ending Balance	[1]	12,301						12,301
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		1,861		22,370	[1]	(16,171)	(34,869)	22,370	[1]	(34,869)
Other comprehensive income before reclassification	[1]							(12,926)
Amounts reclassified from accumulated other comprehensive income	[1]							1,079
Net current-period other comprehensive income, net of tax		8,662		(20,509)		27,675	18,698	(11,847)	[1]
Ending Balance		$ 10,523	[1]	$ 1,861		$ 11,504	$ (16,171)	$ 10,523	[1]	$ 11,504
[1]	All amounts are net-of-tax.

Comprehensive Income - Reclassi

Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Available for sale ("AFS") securities:
Income before income taxes		$ 119,291		$ 63,707		$ 253,754	$ 113,779
Related income tax effect		(24,455)		(11,021)		(52,020)	(20,910)
Net income		94,836	$ 106,898	52,686	$ 40,183	201,734	92,869
Cash flow hedge:
(gains) included in net income		119,291		63,707		253,754	113,779
Related income tax effect		24,455		11,021		52,020	20,910
Net income		94,836	106,898	52,686	40,183	201,734	92,869
Pension plan:
Income before income taxes		119,291		63,707		253,754	113,779
Related income tax effect		(24,455)		(11,021)		(52,020)	(20,910)
Net income		$ 94,836	$ 106,898	$ 52,686	$ 40,183	201,734	$ 92,869
Reclassification out of Accumulated Other Comprehensive Income [Member]
Available for sale ("AFS") securities:
Net income						1,079
Cash flow hedge:
Net income						1,079
Pension plan:
Net income						1,079
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains/Losses on AFS Securities [Member]
Available for sale ("AFS") securities:
Net reclassification adjustment for gains included in net income						(1,444)
Income before income taxes						(1,444)
Related income tax effect						336
Net income						(1,108)
Cash flow hedge:
(gains) included in net income						(1,444)
Related income tax effect						(336)
Net income						(1,108)
Pension plan:
Income before income taxes						(1,444)
Related income tax effect						336
Net income						(1,108)
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						586
Related income tax effect						137
Net income						449
Cash flow hedge:
Net reclassification adjustment for losses included in net income						586
(gains) included in net income						586
Related income tax effect						(137)
Net income						449
Pension plan:
Income before income taxes						586
Related income tax effect						137
Net income						449
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Available for sale ("AFS") securities:
Income before income taxes						3,161
Related income tax effect						(1,423)
Net income						1,738
Cash flow hedge:
(gains) included in net income						3,161
Related income tax effect						1,423
Net income						1,738
Pension plan:
Recognized net actuarial loss	[1]					3,161
Income before income taxes						3,161
Related income tax effect						(1,423)
Net income						$ 1,738
[1]	This AOCI component is included in the computation of changes in plan assets (see Note 16, Employee Benefit Plans)

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement, Option [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share amount	468,892	2,027,073
Restricted Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share amount			978,095	1,700,493

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Distributed earnings allocated to common stock	$ 45,085	$ 45,298	$ 90,153	$ 80,785
Undistributed earnings allocated to common stock	49,478	7,262	111,007	11,840
Net earnings allocated to common shareholders	$ 94,563	$ 52,560	$ 201,160	$ 92,625
Average common shares outstanding	128,750,851	119,823,652	128,693,616	110,559,363
Equivalents from stock options	283,137	64,171	252,664	65,613
Average diluted shares outstanding	129,033,988	119,887,823	128,946,280	110,624,976
Earnings per basic common share	$ 0.73	$ 0.44	$ 1.56	$ 0.84
Earnings per diluted common share	$ 0.73	$ 0.44	$ 1.56	$ 0.84

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2021Trust
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, 2021USD ($)
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, 2021	Dec. 31, 2020	Jun. 30, 2020
Variable Interest Entity [Line Items]
Aggregate Assets	$ 27,190,926	$ 26,184,247
Aggregate Liabilities	22,797,213	21,886,627
Risk Of Loss	27,190,926		$ 26,234,973
Trust Preferred Securities [Member]
Variable Interest Entity [Line Items]
Aggregate Assets	295,246	295,466
Aggregate Liabilities	284,503	284,788
Risk Of Loss	$ 10,743	$ 10,678

Segment Information - Additiona

Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2021Segment
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, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Net interest income	$ 186,517		$ 170,602		$ 377,477	$ 312,120
Provision for credit losses	(8,879)		45,911		(8,736)	73,030
Other income	62,846		88,390		155,419	125,196
Other expense	138,951		149,374		287,878	250,507
Income taxes	24,455		11,021		52,020	20,910
Net income (loss)	94,836	$ 106,898	52,686	$ 40,183	201,734	92,869
Total assets (liabilities)	27,190,926		26,234,973		27,190,926	26,234,973
Average assets (liabilities)	27,005,958		24,402,600		26,750,101	21,985,381
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	183,400		167,703		370,597	308,123
Provision for credit losses	(8,879)		45,911		(8,736)	73,030
Other income	24,072		20,301		50,460	39,868
Other expense	103,429		106,477		213,446	186,941
Income taxes	23,149		5,841		44,351	16,191
Net income (loss)	89,773		29,775		171,996	71,829
Total assets (liabilities)	26,831,380		25,924,599		26,831,380	25,924,599
Average assets (liabilities)	26,661,453		24,198,414		26,409,142	21,825,005
Operating Segments [Member] | Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	2,871		2,246		5,521	3,195
Provision for credit losses	0		0		0	0
Other income	39,765		71,013		107,272	92,203
Other expense	36,391		35,261		77,574	56,018
Income taxes	1,280		6,946		7,220	7,219
Net income (loss)	4,965		31,052		27,999	32,161
Total assets (liabilities)	720,912		730,637		720,912	730,637
Average assets (liabilities)	729,114		660,483		722,997	513,431
Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(2,106)		(2,556)		(4,244)	(5,245)
Provision for credit losses	0		0		0	0
Other income	1,132		47		2,653	56
Other expense	(1,098)		7,398		(3,779)	8,432
Income taxes	26		(1,766)		449	(2,500)
Net income (loss)	98		(8,141)		1,739	(11,121)
Total assets (liabilities)	32,619		25,678		32,619	25,678
Average assets (liabilities)	26,090		16,574		24,709	21,756
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net interest income	2,352		3,209		5,603	6,047
Provision for credit losses	0		0		0	0
Other income	(2,123)		(2,971)		(4,966)	(6,931)
Other expense	229		238		637	(884)
Income taxes	0		0		0	0
Net income (loss)	0		0		0	0
Total assets (liabilities)	(393,985)		(445,941)		(393,985)	(445,941)
Average assets (liabilities)	$ (410,699)		$ (472,871)		$ (406,747)	$ (374,811)