United Bankshares (UBSI) 10-Q 9 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Fiscal Year Focus	2019
Document Period End Date	Jun. 30, 2019
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		101,871,901
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, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 198,171	$ 187,886
Interest-bearing deposits with other banks	1,054,589	831,707
Federal funds sold	813	803
Total cash and cash equivalents	1,253,573	1,020,396
Securities available for sale at estimated fair value (amortized cost-$2,324,286 at June 30, 2019 and $2,360,884 at December 31, 2018)	2,345,791	2,337,039
Securities held to maturity (estimated fair value-$6,483 at June 30, 2019 and $18,655 at December 31, 2018)	6,461	19,999
Equity securities at estimated fair value	9,098	9,734
Other investment securities	201,912	176,955
Loans held for sale (at fair value-$365,440 at June 30, 2019 and $247,104 at December 31, 2018)	370,593	249,846
Loans	13,639,946	13,429,532
Less: Unearned income	(4,680)	(7,310)
Loans net of unearned income	13,635,266	13,422,222
Less: Allowance for loan losses	(76,400)	(76,703)
Net loans	13,558,866	13,345,519
Bank premises and equipment	94,545	95,245
Operating lease right-of-use assets	63,113	0
Goodwill	1,478,014	1,478,014
Accrued interest receivable	60,934	60,597
Other assets	439,639	457,154
TOTAL ASSETS	19,882,539	19,250,498
Deposits:
Noninterest-bearing	4,330,665	4,416,815
Interest-bearing	10,073,420	9,577,934
Total deposits	14,404,085	13,994,749
Borrowings:
Federal funds purchased	0	23,400
Securities sold under agreements to repurchase	122,159	152,927
Federal Home Loan Bank (FHLB) borrowings	1,548,032	1,439,198
Other long-term borrowings	235,535	234,905
Reserve for lending-related commitments	1,752	1,389
Operating lease liabilities	66,821	0
Accrued expenses and other liabilities	170,297	152,306
TOTAL LIABILITIES	16,548,681	15,998,874
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-105,413,508 and 105,239,121 at June 30, 2019 and December 31, 2018, respectively, including 3,450,478 and 2,915,633 shares in treasury at June 30, 2019 and December 31, 2018, respectively	263,534	263,098
Surplus	2,137,459	2,134,462
Retained earnings	1,073,390	1,013,037
Accumulated other comprehensive loss	(20,367)	(57,019)
Treasury stock, at cost	(120,158)	(101,954)
TOTAL SHAREHOLDERS' EQUITY	3,333,858	3,251,624
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 19,882,539	$ 19,250,498

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 2,324,286	$ 2,360,884
Securities held to maturity	6,483	18,655
Loans held for sale at fair value	$ 365,440	$ 247,104
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	105,413,508	105,239,121
Common stock, shares in treasury	3,450,478	2,915,633

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income
Interest and fees on loans	$ 175,130	$ 159,294	$ 340,001	$ 308,222
Interest on federal funds sold and other short-term investments	5,405	3,465	11,242	8,382
Interest and dividends on securities:
Taxable	17,748	13,810	35,111	25,685
Tax-exempt	962	1,431	1,988	2,896
Total interest income	199,245	178,000	388,342	345,185
Interest expense
Interest on deposits	35,455	19,076	68,093	34,733
Interest on short-term borrowings	608	464	1,299	885
Interest on long-term borrowings	12,629	9,338	24,229	16,402
Total interest expense	48,692	28,878	93,621	52,020
Net interest income	150,553	149,122	294,721	293,165
Provision for loan losses	5,417	6,204	10,413	11,382
Net interest income after provision for loan losses	145,136	142,918	284,308	281,783
Other income
Income from bank-owned life insurance	1,326	1,271	3,153	2,525
Net investment securities gains (losses)	109	(55)	(50)	(540)
Other income	310	544	666	987
Total other income	39,795	36,007	71,018	67,199
Other expense
Employee compensation	44,301	43,120	83,250	83,956
Employee benefits	8,578	9,298	18,009	18,869
Net occupancy expense	8,667	9,076	17,418	18,503
Other real estate owned (OREO) expense	633	556	2,049	1,502
Equipment expense	3,675	3,279	6,990	6,436
Data processing expense	5,567	5,817	10,729	11,667
Bankcard processing expense	448	480	928	946
FDIC insurance expense	3,300	2,842	6,600	4,690
FHLB prepayment penalties	5,105	0	5,105	0
Other expense	19,921	18,942	38,542	37,293
Total other expense	100,195	93,410	189,620	183,862
Income before income taxes	84,736	85,515	165,706	165,120
Income taxes	17,529	19,241	34,857	37,140
Net income	$ 67,207	$ 66,274	$ 130,849	$ 127,980
Earnings per common share:
Basic	$ 0.66	$ 0.63	$ 1.28	$ 1.22
Diluted	$ 0.66	$ 0.63	$ 1.28	$ 1.22
Average outstanding shares:
Basic	101,773,643	104,682,910	101,833,880	104,770,681
Diluted	102,047,845	104,952,788	102,099,809	105,058,014
Fees From Trust Services [Member]
Other income
Revenue from contract	$ 3,438	$ 3,104	$ 6,702	$ 6,195
Fees from Brokerage Services [Member]
Other income
Revenue from contract	2,766	1,953	5,290	4,177
Fees from Deposit Services [Member]
Other income
Revenue from contract	8,464	8,420	16,517	16,650
Bankcard Fees and Merchant Discounts [Member]
Other income
Revenue from contract	1,102	1,479	2,258	2,835
Other Service Charges, Commissions, and Fees [Member]
Other income
Revenue from contract	576	599	1,097	1,108
Mortgage Banking [Member]
Other income
Revenue from contract	$ 21,704	$ 18,692	$ 35,385	$ 33,262

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 67,207	$ 63,642	$ 66,274	$ 61,706	$ 130,849	$ 127,980
Change in net unrealized gain (loss) on available-for-sale (AFS) securities, net of tax	17,994		(6,501)		34,783	(23,274)
Accretion of the net unrealized loss on the transfer of AFS securities to held-to-maturity (HTM) securities, net of tax	0		1		0	2
Change in pension plan assets, net of tax	909		1,052		1,819	1,785
Comprehensive income, net of tax	$ 86,110	$ 81,341	$ 60,826	$ 45,667	$ 167,451	$ 106,493

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2017	$ 3,240,530	$ 262,675	$ 2,129,077	$ 891,816	$ (42,025)	$ (1,013)
Beginning Balance, shares at Dec. 31, 2017		105,069,821
Cumulative effect of adopting Accounting Standard Update	0	$ 0	0	136	(136)	0
Reclass due to adopting Accounting Standard Update	0	0	0	6,353	(6,353)	0
Net income	61,706	0	0	61,706	0	0
Other comprehensive income, net of tax	(16,039)	0	0	0	(16,039)	0
Comprehensive income, net of tax	45,667
Stock based compensation expense	968	0	968	0	0	0
Purchase of treasury stock	(404)	0	0	0	0	(404)
Cash dividends	(35,748)			(35,748)	0	0
Grant of restricted stock	0	$ 243	(243)	0	0	0
Grant of restricted stock, shares		97,004
Forfeiture of restricted stock	0	$ 0	27	0	0	(27)
Common stock options exercised	$ 300	$ 37	263	0	0	0
Common stock options exercised, shares	15,043	15,043
Ending Balance at Mar. 31, 2018	$ 3,251,313	$ 262,955	2,130,092	924,263	(64,553)	(1,444)
Ending Balance, shares at Mar. 31, 2018		105,181,868
Beginning Balance at Dec. 31, 2017	3,240,530	$ 262,675	2,129,077	891,816	(42,025)	(1,013)
Beginning Balance, shares at Dec. 31, 2017		105,069,821
Net income	127,980
Other comprehensive income, net of tax	(21,487)
Comprehensive income, net of tax	$ 106,493
Common stock options exercised, shares	42,089
Ending Balance at Jun. 30, 2018	$ 3,242,565	$ 263,022	2,131,697	954,953	(70,001)	(37,106)
Ending Balance, shares at Jun. 30, 2018		105,208,914
Beginning Balance at Mar. 31, 2018	3,251,313	$ 262,955	2,130,092	924,263	(64,553)	(1,444)
Beginning Balance, shares at Mar. 31, 2018		105,181,868
Net income	66,274	$ 0	0	66,274	0	0
Other comprehensive income, net of tax	(5,448)	0	0	0	(5,448)	0
Comprehensive income, net of tax	60,826
Stock based compensation expense	1,024	0	1,024	0	0	0
Purchase of treasury stock	(35,580)	0	0	0	0	(35,580)
Cash dividends	(35,584)	0	0	(35,584)	0	0
Forfeiture of restricted stock	0	0	82	0	0	(82)
Common stock options exercised	$ 566	$ 67	499	0	0	0
Common stock options exercised, shares	27,046	27,046
Ending Balance at Jun. 30, 2018	$ 3,242,565	$ 263,022	2,131,697	954,953	(70,001)	(37,106)
Ending Balance, shares at Jun. 30, 2018		105,208,914
Beginning Balance at Dec. 31, 2018	3,251,624	$ 263,098	2,134,462	1,013,037	(57,019)	(101,954)
Beginning Balance, shares at Dec. 31, 2018		105,239,121
Cumulative effect of adopting Accounting Standard Update	(1,049)	$ 0	0	(1,049)	0	0
Reclass due to adopting Accounting Standard Update	50	0	0	0	50	0
Net income	63,642	0	0	63,642	0	0
Other comprehensive income, net of tax	17,699	0	0	0	17,699	0
Comprehensive income, net of tax	81,341
Stock based compensation expense	1,113	0	1,113	0	0	0
Purchase of treasury stock	(12,072)	0	0	0	0	(12,072)
Cash dividends	(34,759)	0	0	(34,759)	0	0
Grant of restricted stock	0	$ 316	(316)	0	0	0
Grant of restricted stock, shares		126,427
Common stock options exercised	$ 643	$ 84	559	0	0	0
Common stock options exercised, shares	33,816	33,816
Ending Balance at Mar. 31, 2019	$ 3,286,891	$ 263,498	2,135,818	1,040,871	(39,270)	(114,026)
Ending Balance, shares at Mar. 31, 2019		105,399,364
Beginning Balance at Dec. 31, 2018	3,251,624	$ 263,098	2,134,462	1,013,037	(57,019)	(101,954)
Beginning Balance, shares at Dec. 31, 2018		105,239,121
Reclass due to adopting Accounting Standard Update					50
Net income	130,849
Other comprehensive income, net of tax	36,602				36,602
Comprehensive income, net of tax	$ 167,451
Common stock options exercised, shares	47,960
Ending Balance at Jun. 30, 2019	$ 3,333,858	$ 263,534	2,137,459	1,073,390	(20,367)	(120,158)
Ending Balance, shares at Jun. 30, 2019		105,413,508
Beginning Balance at Mar. 31, 2019	3,286,891	$ 263,498	2,135,818	1,040,871	(39,270)	(114,026)
Beginning Balance, shares at Mar. 31, 2019		105,399,364
Net income	67,207	$ 0	0	67,207	0	0
Other comprehensive income, net of tax	18,903	0	0	0	18,903	0
Comprehensive income, net of tax	86,110
Stock based compensation expense	1,198	0	1,198	0	0	0
Purchase of treasury stock	(6,032)	0	0	0	0	(6,032)
Cash dividends	(34,688)	0	0	(34,688)	0	0
Forfeiture of restricted stock	0	0	100	0	0	(100)
Common stock options exercised	$ 379	$ 36	343	0	0	0
Common stock options exercised, shares	14,144	14,144
Ending Balance at Jun. 30, 2019	$ 3,333,858	$ 263,534	$ 2,137,459	$ 1,073,390	$ (20,367)	$ (120,158)
Ending Balance, shares at Jun. 30, 2019		105,413,508

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Cash dividends per share	$ 0.34	$ 0.34	$ 0.34	$ 0.34
Common stock options exercised, shares	14,144	33,816	27,046	15,043
Common Stock [Member]
Grant of restricted stock, shares		126,427		97,004
Forfeiture of restricted stock, shares	2,539		2,170	683
Common stock options exercised, shares	14,144	33,816	27,046	15,043
Treasury Stock [Member]
Purchase of treasury stock, shares	166,604	365,702	962,504	10,842

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
OPERATING ACTIVITIES
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 31,786	$ 98,498
INVESTING ACTIVITIES
Proceeds from maturities and calls of securities held to maturity	2,000	2
Proceeds from sales of securities available for sale	248,187	53,179
Proceeds from maturities and calls of securities available for sale	136,576	124,894
Purchases of securities available for sale	(338,983)	(391,186)
Proceeds from sales of equity securities	1,497	1,826
Purchases of equity securities	(618)	(380)
Proceeds from sales and redemptions of other investment securities	50,271	15,606
Purchases of other investment securities	(75,228)	(33,279)
Redemption of bank-owned life insurance policies	2,829	0
Purchases of bank premises and equipment	(4,110)	(2,159)
Proceeds from sales of bank premises and equipment	251	2,123
Proceeds from the sales of OREO properties	3,870	4,658
Net change in loans	(203,898)	(493,787)
NET CASH USED IN INVESTING ACTIVITIES	(177,356)	(718,503)
FINANCING ACTIVITIES
Cash dividends paid	(69,732)	(71,461)
Acquisition of treasury stock	(18,104)	(35,984)
Proceeds from exercise of stock options	1,020	851
Repayment of long-term Federal Home Loan Bank borrowings	(1,115,000)	(625,000)
Proceeds from issuance of long-term Federal Home Loan Bank borrowings	1,400,000	1,115,000
Repayment of trust preferred issuance	0	(9,374)
Changes in:
Deposits	409,731	812
Federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings	(229,168)	(328,080)
NET CASH PROVIDED BY FINANCING ACTIVITIES	378,747	46,764
Increase (Decrease) in cash and cash equivalents	233,177	(573,241)
Cash and cash equivalents at beginning of year	1,020,396	1,666,167
Cash and cash equivalents at end of period	1,253,573	1,092,926
Noncash investing activities:
Transfers of loans to OREO	3,133	527
Transfer of held to maturity debt securities to available for sale debt securities	$ 11,544	$ 0

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying unaudited consolidated interim financial statements of United Bankshares, Inc. and Subsidiaries (“United” or “the Company”) have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States (GAAP) and with the instructions for Form 10-Q S-X. six-month 10-K. The accompanying consolidated interim financial statements include the accounts of United and its wholly owned subsidiaries. United operates in two business segments: community banking and mortgage banking. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements. Information is presented in these notes to the unaudited consolidated interim financial statements with dollars expressed in thousands, except per share or unless otherwise noted. New Accounting Standards In April 2019, the Financial Accounting Standards Board (FASB) issued ASU No. 2019-04 “Codification Improvements to Topic 326, Financial Instruments – Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments.” The amendments clarify the scope of the credit losses standard and address issued related to accrued interest receivable balances, recoveries, variable interest rates and prepayments. The amendments also address partial-term fair valued hedges, fair value hedge basis adjustments. The amendments to the credit losses and hedging standards have the same effective dates as those standards, unless an entity has already adopted the standards. The amendments to recognition and measurement guidance are effective for fiscal years beginning after December 15, 2019; early adoption is permitted. Management is currently evaluating the possible impact this standard may have on the Company’s financial condition or results of operations. In August 2018, the FASB issued ASU No. 2018-14 “Compensation – Retirement Benefits – Defined Benefits – General (Topic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” This update amends ASC Topic 715 to add, remove, and clarify disclosure requirements related to defined benefit pension and other post retirement plans. The ASU’s changes related to disclosures are part of the FASB’s disclosure framework project, which the FASB launched in 2014 to improve effectiveness of disclosures in notes to financial statements. ASU No. 2018-14 is effective for public companies for fiscal years, and interim fiscal periods within those fiscal years, beginning after December 15, 2020; early adoption is permitted. ASU No. 2018-14 is not expected to have a material impact on the Company’s financial condition or results of operations. In August 2018, the FASB issued ASU No. 2018-13 2018-13 2018-13 In June 2018, the FASB issued Accounting Standards Update (ASU) No. 2018-07 non-employees non-employee 2018-07 2018-07 In August 2017, the FASB issued ASU No. 2017-12, one-time 2017-12 one-time In July 2017, the FASB issued ASU No. 2017-11, “Part I, Accounting for Certain Financial Instruments with Down Round Features and Part II, Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling interests with a Scope Exception.” Part I of this ASU simplifies the accounting for financial instruments that include down round features while the amendments in Part II, which do not have an accounting effect, address the difficulty of navigating the guidance in ASC 480, “Distinguishing Liabilities from Equity”, due to the existence of extensive pending content in the Codification. ASU No. 2017-11 is effective for interim and annual reporting periods beginning after December 15, 2018. ASU No. 2017-11 was adopted by United on January 1, 2019. In March 2017, the FASB issued ASU No. 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” This update amends the amortization period for certain purchased callable debt securities held at a premium. FASB is shortening the amortization period for the premium to the earliest call date. The amendments in this update became effective for annual reporting periods beginning after December 15, 2018, including interim reporting periods within those annual reporting periods. ASU No. 2017-08 was adopted by United on January 1, 2019. The adoption did not have a material impact on the Company’s financial condition or results of operations. In January 2017, the FASB issued ASU No. 2017-04, 2017-04 2017-04 In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments – Credit Losses.” ASU No. 2016-13 changes the impairment model for most financial assets and certain other instruments that aren’t measured at fair value through net income. The standard will replace today’s “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost and require entities to record allowances for available for sale debt securities rather than reduce the carrying amount under the current other-than-temporary impairment (OTTI) model. ASU No. 2016-13 also simplifies the accounting model for purchased credit-impaired debt securities and loans. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. In May 2019, the FASB issued Accounting Standards Update (ASU) No. 2019-05 “Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief.” ASU 2019-05 amends ASU 2016-13 to allow companies to irrevocably elect, upon adoption of ASU 2016-13, the fair value option on financial instruments that were previously recorded at amortized cost and are within the scope of ASC 326-20 if the instruments are eligible for the fair value option under ASC 825-10. The fair value option election does not apply to held-to-maturity debt securities. Entities are required to make this election on an instrument-by-instrument basis. ASU No. 2019-05 is effective on the same date as ASU No. 2016-13, which is January 1, 2020 for United, with early adoption permitted. United has completed an initial data gap assessment and loan segmentation procedures and is currently evaluating the various forecasting and modeling assumptions that will be used to estimate the initial current expected credit loss allowance. In addition, United is currently working through the implementation plan which includes documentation of methodologies, processes, data sources, internal controls and policies, as well as model development, documentation and validation. United has engaged a third-party service provider to assist with the implementation of the new accounting standard. Management is currently evaluating the possible impact this standard may have on the Company’s financial condition or results of operations. In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”. ASU No. 2016-02 includes a lessee accounting model that recognizes two types of leases, finance leases and operating leases, while lessor accounting will remain largely unchanged from the current GAAP. ASU No. 2016-02 requires, amongst other things, that a lessee recognize on the balance sheet a right-of-use asset and a lease liability for leases with terms of more than twelve months. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee will depend on its classification as a finance or operating lease. In July 2018, the FASB issued ASU No. 2018-11 “Leases (Topic 842), Targeted Improvements.” This update creates an additional transition method, and a lessor practical expedient to not separate lease and non-lease components if specified criteria are met. The new transition method allows companies to use the effective date of the new leases standard as the date of initial application transition. Companies that elect this transition option will not adjust their comparative period financial information for the effect of ASC Topic 842, nor will they make the new required lease disclosure for periods before the effective date. In addition, these companies will carry forward their ASC Topic 840 disclosures for comparative periods. The practical expedient permits lessors to make an accounting policy election by class of underlying asset to not separate lease and non-lease components if specified criteria are met. In July 2018, the FASB issued ASU No. 2018-10 “Codification Improvements to ASC Topic 842, Leases.” This update includes narrow amendments to clarify how to apply certain aspects of the new leases standard. The amendments address the rate implicit in the lease, impairment of the net investment in the lease, lessee reassessment of lease classification, lessor reassessment of lease term and purchase options, variable payments that depend on an index or rate and certain transition adjustments. ASU 2018-10 does not make any substantive changes to the core provisions or principals of the new leases standard. United adopted the standard using the modified retrospective transition method on January 1, 2019. The Company evaluated and elected the package of practical expedients, which allows for existing leases to be accounted for consistent with current guidance, with the exception of the balance sheet recognition for lessees. The Company has also elected the practical expedient on not separating lease and nonlease components and instead treating them as a single lease component. Adoption of the standard resulted in the recognition of additional net lease assets and lease liabilities of $ 67,040 70,692 1,049

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Investment Securities	2. INVESTMENT SECURITIES Securities Available for Sale Securities held for indefinite periods of time are classified as available for sale and carried at estimated fair value. The amortized cost and estimated fair values of securities available for sale are summarized as follows. June 30, 2019 Gross Gross Estimated Cumulative Amortized Unrealized Unrealized Fair OTTI in Cost Gains Losses Value AOCI (1) U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 73,369 $ 1,116 $ 1 $ 74,484 $ 0 State and political subdivisions 178,833 2,968 542 181,259 0 Residential mortgage-backed securities Agency 866,597 12,539 1,569 877,567 0 Non-agency 3,598 380 0 3,978 86 Commercial mortgage-backed securities Agency 566,366 8,738 383 574,721 0 Asset-backed securities 272,423 0 3,569 268,854 0 Trust preferred collateralized debt obligations 6,136 0 723 5,413 398 Single issue trust preferred securities 18,180 175 1,511 16,844 0 Other corporate securities 338,784 3,900 13 342,671 0 Total $ 2,324,286 $ 29,816 $ 8,311 $ 2,345,791 $ 484 December 31, 2018 Gross Gross Estimated Cumulative Amortized Unrealized Unrealized Fair OTTI in Cost Gains Losses Value AOCI (1) U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 86,285 $ 35 $ 430 $ 85,890 $ 0 State and political subdivisions 212,670 439 4,121 208,988 0 Residential mortgage-backed securities Agency 1,047,345 3,235 14,930 1,035,650 0 Non-agency 3,927 332 0 4,259 86 Commercial mortgage-backed securities Agency 560,634 996 7,030 554,600 0 Asset-backed securities 272,459 450 939 271,970 0 Trust preferred collateralized debt obligations 6,176 91 350 5,917 2,586 Single issue trust preferred securities 8,754 169 561 8,362 0 Other corporate securities 162,634 118 1,349 161,403 0 Total $ 2,360,884 $ 5,865 $ 29,710 $ 2,337,039 $ 2,672 (1) Non-credit before-tax. The following is a summary of securities available for sale which were in an unrealized loss position at June 30, 2019 and December 31, 2018. Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses June 30, 2019 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 2,621 $ 1 State and political subdivisions 1,127 6 50,689 536 Residential mortgage-backed securities Agency 9,460 9 180,352 1,560 Non-agency 0 0 0 0 Commercial mortgage-backed securities Agency 42,489 47 110,943 336 Asset-backed securities 261,566 3,462 7,288 107 Trust preferred collateralized debt obligations 0 0 5,412 723 Single issue trust preferred securities 0 0 13,633 1,511 Other corporate securities 12,679 13 0 0 Total $ 327,321 $ 3,537 $ 370,938 $ 4,774 Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses December 31, 2018 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 66,072 $ 250 $ 7,374 $ 180 State and political subdivisions 53,421 544 94,337 3,577 Residential mortgage-backed securities Agency 195,009 1,597 508,041 13,333 Non-agency 0 0 0 0 Commercial mortgage-backed securities Agency 107,443 1,124 294,129 5,906 Asset-backed securities 151,427 939 0 0 Trust preferred collateralized debt obligations 0 0 2,150 350 Single issue trust preferred securities 0 0 5,163 561 Other corporate securities 129,709 1,233 6,879 116 Total $ 703,081 $ 5,687 $ 918,073 $ 24,023 The following table shows the proceeds from maturities, sales and calls of available for sale securities and the gross realized gains and losses on sales and calls of those securities that have been included in earnings as a result of any sales and calls. Gains or losses on sales and calls of available for sale securities were recognized by the specific identification method. The realized losses relate to sales of securities within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers and its subsidiaries. Three Months Ended June 30 Six Months Ended June 30 2019 2018 2019 2018 Proceeds from sales and calls $ 188,432 $ 75,157 $ 384,763 $ 174,860 Gross realized gains 739 58 754 1,221 Gross realized losses 608 85 972 1,397 At June 30, 2019, gross unrealized losses on available for sale securities were $8,311 on 245 securities of a total portfolio of 791 In determining whether or not a security is other-than-temporarily impaired (OTTI), management considered the severity and the duration of the loss in conjunction with United’s positive intent and the more likely than not ability to hold these securities to recovery of their cost basis or maturity. State and political subdivisions United’s state and political subdivisions portfolio relates to securities issued by various municipalities located throughout the United States. The total amortized cost of available for sale state and political subdivision securities was $178,833 at June 30, 2019. As of June 30, 2019, approximately 77% 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 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 $1,432,963 at June 30, 2019. Of the $ 1,432,963 amount, $566,366 was related to agency commercial mortgage-backed securities and $866,597 was related to agency residential mortgage-backed securities. Each of the agency mortgage-backed securities provides a guarantee of full and timely payments of principal and interest by the issuing agency. Based upon management’s analysis and judgment, it was determined that none of the agency mortgage-backed securities were other-than-temporarily impaired at June 30, 2019. Non-agency United’s non-agency non-agency 3,598 non-agency Single issue trust preferred securities The majority of United’s single issue trust preferred portfolio consists of obligations from large cap banks (i.e. banks with market capitalization in excess of $10 billion). All single issue trust preferred securities are currently receiving interest payments. The amortized cost of available for sale single issue trust preferred securities as of June 30, 2019 consisted of $4,036 in investment grade bonds, $5,935 in split rated bonds, $2,480 in below investment grade rated bonds, and $5,729 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 2019, it was determined that none of the single issue trust preferred securities were other-than-temporarily impaired. Trust preferred collateralized debt obligations (Trup Cdos) The total amortized cost balance of United’s Trup Cdo portfolio was $6,136 as of June 30, 2019. For any securities in an unrealized loss position, the Company first assesses its intentions regarding any sale of securities as well as the likelihood that it would be required to sell prior to recovery of the amortized cost. As of June 30, 2019, the Company has determined that it does not intend to sell any Trup Cdo and that it is not more likely than not that the Company will be required to sell such securities before recovery of their amortized cost. To determine a net realizable value and assess whether other-than-temporary impairment existed, management performed detailed cash flow analysis to determine whether, in management’s judgment, it was more likely that United would not recover the entire amortized cost basis of the security. Based on this review, management determined that one of the Trup Cdo securities was other-than-temporarily impaired as of June 30, 2019. The total amount of OTTI recognized in earnings on this security during the second quarter of 2019 was $54. As of June 30, 2019, United’s Corporate securities portfolio had a total amortized cost balance of $338,784. The majority of the portfolio consisted of debt issuances of corporations representing a variety of industries, including financial institutions. Of the $338,784, 94% was investment grade rated and 6% was unrated. For corporate Below is a progression of the credit losses on securities which United has recorded other-than-temporary charges. These charges were recorded through earnings and other comprehensive income. Three Months Ended June 30 Six Months Ended June 30 2019 2018 2019 2018 Balance of cumulative credit losses at beginning of period $ 3,138 $ 3,199 $ 3,138 $ 18,060 Additional credit losses on securities for which OTTI was previously recognized 54 0 54 0 Reductions for securities sold or paid off during the period 0 0 0 (14,861 ) Balance of cumulative credit losses at end of period $ 3,192 $ 3,199 $ 3,192 $ 3,199 The amortized cost and estimated fair value of securities available for sale at June 30, 2019 and December 31, 2018 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, 2019 December 31, 2018 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 150,318 $ 150,304 $ 77,534 $ 77,266 Due after one year through five years 560,933 567,674 518,975 514,734 Due after five years through ten years 519,370 527,238 483,567 477,135 Due after ten years 1,093,665 1,100,575 1,280,808 1,267,904 Total $ 2,324,286 $ 2,345,791 $ 2,360,884 $ 2,337,039 Securities Held to Maturity The amortized cost and estimated fair values of securities held to maturity are summarized as follows: June 30, 2019 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 5,015 $ 21 $ 0 $ 5,036 State and political subdivisions 1,426 1 0 1,427 Residential mortgage-backed securities Agency 0 0 0 0 Single issue trust preferred securities 0 0 0 0 Other corporate securities 20 0 0 20 Total $ 6,461 $ 22 $ 0 $ 6,483 December 31, 2018 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 5,074 $ 90 $ 0 $ 5,164 State and political subdivisions 5,473 7 1 5,479 Residential mortgage-backed securities Agency 20 2 0 22 Single issue trust preferred securities 9,412 0 1,442 7,970 Other corporate securities 20 0 0 20 Total $ 19,999 $ 99 $ 1,443 $ 18,655 Even though the market value of the held to maturity investment portfolio is less than its cost, the unrealized loss has no impact on the net worth or regulatory capital requirements of United. There were no gross realized gains or losses on calls and sales of held to maturity securities included in earnings for the second quarter and first six months of 2019 and 2018. The amortized cost and estimated fair value of debt securities held to maturity at June 30, 2019 and December 31, 2018 by contractual maturity are shown below. Expected maturities may differ from contractual maturities because the issuers may have the right to call or prepay obligations without penalties. June 30, 2019 December 31, 2018 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 5,225 $ 5,246 $ 7,913 $ 8,005 Due after one year through five years 216 217 1,059 1,061 Due after five years through ten years 0 0 8,030 7,134 Due after ten years 1,020 1,020 2,997 2,455 Total $ 6,461 $ 6,483 $ 19,999 $ 18,655 Equity securities at fair value Equity securities consist mainly of equity securities of financial institutions and mutual funds within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries. The fair value of United’s equity securities was $9,098 at June 30, 2019 and $9,734 at December 31, 2018. Three Months Ended June 30 Six Months Ended June 30 2019 2018 2019 2018 Net gains (losses) recognized during the period $ 55 $ (28 ) $ 244 $ (64 ) Net gains (losses) recognized during the period on equity securities sold 2 (4 ) 134 (2 ) Unrealized gains recognized during the period on equity securities still held at period end 64 11 122 50 Unrealized losses recognized during the period on equity securities still held at period end 11 35 12 112 Other investment securities During the second quarter of 2019, United evaluated all of its cost method investments to determine if certain events or changes in circumstances during the second quarter of 2019 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 $1,588,440 and $1,887,176 at June 30, 2019 and December 31, 2018 respectively.

Loans

Loans	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Loans	3. LOANS Major classes of loans are as follows: June 30, 2019 December 31, Commercial, financial and agricultural: Owner-occupied commercial real estate $ 1,239,954 $ 1,291,790 Nonowner-occupied commercial real estate 4,194,064 4,303,613 Other commercial loans 2,021,953 1,957,641 Total commercial, financial & agricultural 7,455,971 7,553,044 Residential real estate 3,674,005 3,501,393 Construction & land development 1,464,064 1,410,468 Consumer: Bankcard 9,380 10,203 Other consumer 1,036,526 954,424 Total gross loans $ 13,639,946 $ 13,429,532 The table above does not include loans held for sale of $370,593 and $249,846 at June 30, 2019 and December 31, 2018, respectively. Loans held for sale consist of single-family residential real estate loans originated for sale in the secondary market. The outstanding balances in the table above include previously acquired impaired loans with a recorded investment of $111,611 or 0.82% of total gross loans at June 30, 2019 and $149,737 or 1.12% of total gross loans at December 31, 2018. The contractual principal in these acquired impaired loans was $144,127 and $195,706 at June 30, 2019 and December 31, 2018, respectively. The balances above do not include future accretable net interest (i.e. the difference between the undiscounted expected cash flows and the recorded investment in the loan) on the acquired impaired loans. Activity for the accretable yield for the first six months of 2019 follows: Accretable yield at the beginning of the period $ 26,289 Accretion (including cash recoveries) (5,850 ) Additions 0 Net reclassifications to accretable from non-accretable 7,051 Disposals (including maturities, foreclosures, and charge-offs) (4,335 ) Accretable yield at the end of the period $ 23,155 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 $85,506 and $93,282 at June 30, 2019 and December 31, 2018, respectively.

Credit Quality

Credit Quality	6 Months Ended
	Jun. 30, 2019
Text Block [Abstract]
Credit Quality	4. CREDIT QUALITY Management monitors the credit quality of its loans on an ongoing basis. Measurement of delinquency and past due status are based on the contractual terms of each loan. For all loan classes, past due loans are reviewed on a monthly basis to identify loans for nonaccrual status. Generally, when collection in full of the principal and interest is jeopardized, the loan is placed on nonaccrual status. The accrual of interest income on commercial and most consumer loans generally is discontinued when a loan becomes 90 to 120 days past due as to principal or interest. However, regardless of delinquency status, if a loan is fully secured and in the process of collection and resolution of collection is expected in the near term (generally less than 90 days), then the loan will not be placed on nonaccrual status. When interest accruals are discontinued, unpaid interest recognized in income in the current year is reversed, and unpaid interest accrued in prior years is charged to the allowance for loan losses. United’s method of income recognition for loans that are classified as nonaccrual is to recognize interest income on a cash basis or apply the cash receipt to principal when the ultimate collectibility of principal is in doubt. Nonaccrual loans will not normally be returned to accrual status unless all past due principal and interest has been paid and the borrower has evidenced their ability to meet the contractual provisions of the note. A loan is categorized as a troubled debt restructuring (TDR) if a concession is granted and there is deterioration in the financial condition of the borrower. TDRs can take the form of a reduction of the stated interest rate, splitting a loan into separate loans with market terms on one loan and concessionary terms on the other loan, receipts of assets from a debtor in partial or full satisfaction of a loan, the extension of the maturity date or dates at a stated interest rate lower than the current market rate for new debt with similar risk, the reduction of the face amount or maturity amount of the debt as stated in the instrument or other agreement, the reduction of accrued interest or any other concessionary type of renegotiated debt. As of June 30, 2019, United had TDRs of $58,750 as compared to $59,425 as of December 31, 2018. Of the $58,750 aggregate balance of TDRs at June 30, 2019, $48,586 was on nonaccrual and $1,278 were 30-89 days past due. Of the $59,425 aggregate balance of TDRs at December 31, 2018, $48,899 were on nonaccrual and $690 were 90 days or more past due. All these amounts are included in the appropriate categories in the “Age Analysis of Past Due Loans” table on a subsequent page. As of June 30, 2019, there were no commitments to lend additional funds to debtors owing receivables whose terms have been modified in TDRs. At June 30, 2019, United had restructured loans in the amount of $1,801 that were modified by a reduction in the interest rate, $1,796 that were modified by a combination of a reduction in the interest rate and the principal and $55,153 that were modified by a change in terms. A loan acquired and accounted for under ASC Topic 310-30 The following table sets forth United’s troubled debt restructurings that have been restructured during the three months ended June 30, 2019 and 2018, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2019 June 30, 2018 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate: Owner-occupied 1 $ 150 $ 150 0 $ 0 $ 0 Nonowner-occupied 0 0 0 0 0 0 Other commercial 1 559 559 4 9,571 9,571 Residential real estate 2 1,845 1,832 2 6,953 6,953 Construction & land 3 2,242 2,202 0 0 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total 7 $ 4,796 $ 4,743 6 $ 16,524 $ 16,524 The following table sets forth United’s troubled debt restructurings that have been restructured during the six months ended June 30, 2019 and 2018, segregated by class of loans: Troubled Debt Restructurings For the Six Months Ended June 30, 2019 June 30, 2018 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate: Owner-occupied 1 $ 150 $ 150 0 $ 0 $ 0 Nonowner-occupied 0 0 0 0 0 0 Other commercial 2 824 811 4 9,571 9,571 Residential real estate 3 2,258 2,234 2 6,953 6,953 Construction & land development 3 2,242 2,202 0 0 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total 9 $ 5,474 $ 5,397 6 $ 16,524 $ 16,524 During the second quarter of 2019, $4,743 of restructured loans were modified by a change in terms. For the first six months of 2019, $ 251 The following table presents troubled debt restructurings, by class of loan, that were restructured during the twelve-month period ended June 30, 2019 and had charge-offs during the six months ended June 30, 2019. No troubled debt restructurings had charge-offs during the second quarter of 2019. Six Months Ended June 30, 2019 (In thousands) Number of Contracts Recorded Investment Troubled Debt Restructurings Commercial real estate: Owner-occupied 0 $ 0 Nonowner-occupied 0 0 Other commercial 1 1,321 Residential real estate 0 0 Construction & land development 0 0 Consumer: Bankcard 0 0 Other consumer 0 0 Total 1 $ 1,321 No loans restructured during the twelve-month period ended June 30, 2018 subsequently defaulted, resulting in a principal charge-off during the second quarter and first six months of 2018. The following table sets forth United’s age analysis of its past due loans, segregated by class of loans: Age Analysis of Past Due Loans As of June 30, 2019 30-89 Days Past Due 90 Days or more Past Due Total Past Due Current & Other (1) Total Financing Receivables Recorded Investment >90 Days & Accruing Commercial real estate: Owner-occupied $ 11,074 $ 17,603 $ 28,677 $ 1,211,277 $ 1,239,954 $ 1,136 Nonowner-occupied 7,572 19,678 27,250 4,166,814 4,194,064 2,713 Other commercial 10,075 44,843 54,918 1,967,035 2,021,953 745 Residential real estate 33,514 32,418 65,932 3,608,073 3,674,005 7,069 Construction & land development 4,233 17,083 21,316 1,442,748 1,464,064 495 Consumer: Bankcard 450 129 579 8,801 9,380 129 Other consumer 8,011 684 8,695 1,027,831 1,036,526 442 Total $ 74,929 $ 132,438 $ 207,367 $ 13,432,579 $ 13,639,946 $ 12,729 (1) Other includes loans with a recorded investment of $ 111,611 310-30 Age Analysis of Past Due Loans As of December 31, 2018 30-89 Days Past Due 90 Days or more Past Due Total Past Due Current & Other (1) Total Financing Receivables Recorded Investment >90 Days & Accruing Commercial real estate: Owner-occupied $ 9,224 $ 17,742 $ 26,966 $ 1,264,824 $ 1,291,790 $ 629 Nonowner-occupied 16,108 18,092 34,200 4,269,413 4,303,613 1,171 Other commercial 13,556 46,040 59,596 1,898,045 1,957,641 2,850 Residential real estate 37,111 30,278 67,389 3,434,004 3,501,393 9,141 Construction & land development 8,462 19,412 27,874 1,382,594 1,410,468 680 Consumer: Bankcard 657 177 834 9,369 10,203 177 Other consumer 8,909 1,243 10,152 944,272 954,424 893 Total $ 94,027 $ 132,984 $ 227,011 $ 13,202,521 $ 13,429,532 $ 15,541 (1) Other includes loans with a recorded investment of $149,737 acquired and accounted for under ASC Topic 310-30 “Loans and Debt Securities Acquired with Deteriorated Credit Quality”. The following table sets forth United’s nonaccrual loans, segregated by class of loans: Loans on Nonaccrual Status June 30, 2019 December 31, 2018 Commercial real estate: Owner-occupied $ 16,467 $ 17,113 Nonowner-occupied 16,965 16,921 Other commercial 44,098 43,190 Residential real estate 25,349 21,137 Construction & land development 16,588 18,732 Consumer: Bankcard 0 0 Other consumer 242 350 Total $ 119,709 $ 117,443 United assigns credit quality indicators of pass, special mention, substandard and doubtful to its loans. For United’s loans with a corporate credit exposure, United internally assigns a grade based on the creditworthiness of the borrower. 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 days are generally considered special mention. A substandard loan with a corporate credit exposure is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness, or weaknesses, that jeopardize the liquidation of the debt by the borrower. They are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. They require more intensive supervision by management. Substandard loans are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity, or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. For some substandard loans, the likelihood of full collection of interest and principal may be in doubt and thus, placed on nonaccrual. For loans with a consumer credit exposure, loans that are 90 days or more past due or that have been placed on nonaccrual are considered substandard. A loan with corporate credit exposure is classified as doubtful if it has all the weaknesses inherent in one classified as substandard with the added characteristic that the weaknesses make collection in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. A doubtful loan has a high probability of total or substantial loss, but because of specific pending events that may strengthen the loan, its classification as loss is deferred. Doubtful borrowers are usually in default, lack adequate liquidity or capital, and lack the resources necessary to remain an operating entity. Pending events can include mergers, acquisitions, liquidations, capital injections, the perfection of liens on additional collateral, the valuation of collateral, and refinancing. Generally, there are not any loans with a consumer credit exposure that are classified as doubtful. Usually, they are charged-off prior to such a classification. Loans classified as doubtful are also considered impaired. The following tables set forth United’s credit quality indicators information​​​​​​​, by class of loans: Credit Quality Indicators Corporate Credit Exposure As of June 30, 2019 Commercial Real Estate Other Construction & Land Development Owner- Nonowner- Grade: Pass $ 1,146,018 $ 4,080,814 $ 1,892,676 $ 1,377,072 Special mention 33,082 37,946 55,345 11,038 Substandard 60,854 75,304 73,497 75,954 Doubtful 0 0 435 0 Total $ 1,239,954 $ 4,194,064 $ 2,021,953 $ 1,464,064 As of December 31, 2018 Commercial Real Estate Other Construction & Land Owner- Nonowner- Grade: Pass $ 1,201,387 $ 4,161,149 $ 1,858,821 $ 1,330,899 Special mention 34,487 46,442 14,424 28,629 Substandard 55,916 96,022 81,946 50,940 Doubtful 0 0 2,450 0 Total $ 1,291,790 $ 4,303,613 $ 1,957,641 $ 1,410,468 Credit Quality Indicators Consumer Credit Exposure As of June 30, 2019 Residential Bankcard Other Grade: Pass $ 3,611,502 $ 8,801 $ 1,027,772 Special mention 15,833 450 8,015 Substandard 46,670 129 739 Doubtful 0 0 0 Total $ 3,674,005 $ 9,380 $ 1,036,526 As of December 31, 2018 Residential Bankcard Other Grade: Pass $ 3,436,584 $ 9,369 $ 944,241 Special mention 19,051 657 8,914 Substandard 45,758 177 1,269 Doubtful 0 0 0 Total $ 3,501,393 $ 10,203 $ 954,424 Loans are designated as impaired when, in the opinion of management, based on current information​​​​​​​ and events, the collection of principal and interest in accordance with the loan contract is doubtful. Typically, United does not consider loans for impairment unless a sustained period of delinquency (i.e. 90 days or more) is noted or there are subsequent events that impact repayment probability (i.e. negative financial trends, bankruptcy filings, eminent foreclosure proceedings, etc.). Impairment is evaluated in total for smaller-balance loans of a similar nature and on an individual loan basis for other loans. Consistent with United’s existing method of income recognition for loans, interest on impaired loans, except those classified as nonaccrual, is recognized as income using the accrual method. Impaired loans, or portions thereof, are charged off when deemed uncollectible. The following table sets forth United’s impaired loans information, by class of loans: Impaired Loans June 30, 2019 December 31, 2018 Recorded Unpaid Related Recorded Unpaid Related With no related allowance recorded: Commercial real estate: Owner-occupied $ 71,948 $ 73,267 $ 0 $ 63,633 $ 63,798 $ 0 Nonowner-occupied 50,228 50,294 0 98,845 98,904 0 Other commercial 63,121 68,326 0 40,291 50,459 0 Residential real estate 34,972 35,174 0 28,207 29,279 0 Construction & land development 36,868 43,318 0 37,174 40,459 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 31 31 0 27 27 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,942 $ 4,942 $ 1,390 $ 10,004 $ 10,004 $ 2,542 Nonowner-occupied 10,371 10,371 1,524 15,720 15,720 2,715 Other commercial 35,166 37,403 7,805 61,266 62,812 17,581 Residential real estate 12,013 13,618 1,390 19,623 22,064 3,265 Construction & land development 14,085 16,135 1,954 14,742 19,446 2,254 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 76,890 $ 78,209 $ 1,390 $ 73,637 $ 73,802 $ 2,542 Nonowner-occupied 60,599 60,665 1,524 114,565 114,624 2,715 Other commercial 98,287 105,729 7,805 101,557 113,271 17,581 Residential real estate 46,985 48,792 1,390 47,830 51,343 3,265 Construction & land development 50,953 59,453 1,954 51,916 59,905 2,254 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 31 31 0 27 27 0 Impaired Loans For the Three Months Ended June 30, 2019 June 30, 2018 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 70,051 $ 467 $ 74,330 $ 354 Nonowner-occupied 68,371 354 108,343 159 Other commercial 52,659 327 52,384 246 Residential real estate 32,287 158 24,220 85 Construction & land development 36,654 199 46,909 98 Consumer: Bankcard 0 0 0 0 Other consumer 29 0 32 0 Impaired Loans For the Three Months Ended June 30, 2019 June 30, 2018 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With an allowance recorded: Commercial real estate: Owner-occupied $ 5,212 $ 0 $ 5,319 $ 6 Nonowner-occupied 12,210 39 9,503 60 Other commercial 41,641 9 46,376 10 Residential real estate 14,451 48 11,992 11 Construction & land development 14,413 20 2,008 20 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 75,263 $ 467 $ 79,649 $ 360 Nonowner-occupied 80,581 393 117,846 219 Other commercial 94,300 336 98,760 256 Residential real estate 46,738 206 36,212 96 Construction & land development 51,067 219 48,917 118 Consumer: Bankcard 0 0 0 0 Other consumer 29 0 32 0 Impaired Loans For the Six Months Ended June 30, 2019 June 30, 2018 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 67,911 $ 911 $ 75,592 $ 739 Nonowner-occupied 78,529 708 116,941 328 Other commercial 48,536 614 50,587 470 Residential real estate 30,927 342 25,064 180 Construction & land development 36,828 417 48,699 197 Consumer: Bankcard 0 0 0 0 Other consumer 28 0 26 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 6,809 $ 0 $ 6,590 $ 31 Nonowner-occupied 13,380 84 8,934 119 Other commercial 48,183 49 51,088 28 Residential real estate 16,175 140 11,266 21 Construction & land development 14,522 40 1,800 40 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 74,720 $ 911 $ 82,182 $ 770 Nonowner-occupied 91,909 792 125,875 447 Other commercial 96,719 663 101,675 498 Residential real estate 47,102 482 36,330 201 Construction & land development 51,350 457 50,499 237 Consumer: Bankcard 0 0 0 0 Other consumer 28 0 26 0 At June 30, 2019 and December 31, 2018, other real estate owned (“OREO”) included in other assets in the Consolidated Balance Sheets was $14,469 and $16,865, respectively. OREO consists of real estate acquired in foreclosure or other settlement of loans. Such assets are carried at the lower of the investment in the assets or the fair value of the assets less estimated selling costs. Any adjustment to the fair value at the date of transfer is charged against the allowance for loan losses. Any subsequent valuation adjustments as well as any costs relating to operating, holding or disposing of the property are recorded in other expense in the period incurred. At June 30, 2019 and December 31, 2018, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $288 and $520, respectively.

Allowance for Credit Losses

Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Allowance for Credit Losses	5. ALLOWANCE FOR CREDIT LOSSES The allowance for loan losses is management’s estimate of the probable credit losses inherent in the loan portfolio. For purposes of determining the general allowance, the loan portfolio is segregated by product type to recognize differing risk profiles among categories. It is further segregated by credit grade for non-homogenous Loans deemed to be uncollectible are charged against the allowance for loan losses, while recoveries of previously charged-off charge-off charge-off charged-off charge-off For consumer loans, closed-end open-end charged-off. one-to-four open-end closed-end high-loan-to-value charges-off charged-off charged-off For loans acquired through the completion of a transfer, including loans acquired in a business combination, that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that United will be unable to collect all contractually required payment receivable are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield,” is recognized as interest income on a level-yield method over the life of the loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized as a yield adjustment or as a loss accrual or a valuation allowance. Increases in expected cash flows subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over its remaining life. Decreases in expected cash flows are recognized as impairment. Valuation allowances on these impaired loans reflect only losses incurred after the acquisition (meaning the present value of all cash flows expected at acquisition that ultimately are not to be received). For the three and six months ended June 30, 2019, the amount of provision for loan losses related to loans acquired that have evidence of deterioration of credit quality resulted in provision for loan losses expense of $1,631 and $3,268, respectively, as compared to a provision for loan losses expense of $801 and $2,080, respectively, for the three and six months ended June 30, 2018. 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 $1,752 and $1,389 at June 30, 2019 and December 31, 2018, 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 are referred to as the allowance for credit losses. A progression of the allowance for loan losses, by portfolio segment, for the periods indicated is summarized as follows: Allowance for Loan Losses For the Three Months Ended June 30, 2019 Commercial Real Estate Construction Allowance for Owner- occupied Nonowner- occupied Other Commercial Residential Real Estate & Land Development Consumer Estimated Imprecision Total Allowance for Loan Losses: Beginning balance $ 6,164 $ 6,718 $ 40,664 $ 13,022 $ 7,186 $ 2,748 $ 384 $ 76,886 Charge-offs 2,784 69 3,645 309 8 773 0 7,588 Recoveries 714 22 420 269 39 221 0 1,685 Provision 1,503 (630 ) 7,270 (2,810 ) (292 ) 527 (151 ) 5,417 Ending balance $ 5,597 $ 6,041 $ 44,709 $ 10,172 $ 6,925 $ 2,723 $ 233 $ 76,400 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2019 Commercial Real Estate Construction Allowance for Owner- occupied Nonowner- occupied Other Commercial Residential Real Estate & Land Development Consumer Estimated Imprecision Total Allowance for Loan Losses: Beginning balance $ 5,063 $ 6,919 $ 41,341 $ 12,448 $ 7,992 $ 2,695 $ 245 $ 76,703 Charge-offs 6,521 69 4,579 750 573 1,510 0 14,002 Recoveries 1,618 41 717 354 152 404 0 3,286 Provision 5,437 (850 ) 7,230 (1,880 ) (646 ) 1,134 (12 ) 10,413 Ending balance $ 5,597 $ 6,041 $ 44,709 $ 10,172 $ 6,925 $ 2,723 $ 233 $ 76,400 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2019 Commercial Real Estate Construction Allowance for Owner- Nonowner- Other Residential & Land Consumer Estimated Total Ending Balance: individually evaluated for impairment $ 1,390 $ 1,524 $ 7,805 $ 1,390 $ 1,954 $ 0 $ 0 $ 14,063 Ending Balance: collectively evaluated for impairment $ 4,207 $ 4,517 $ 36,904 $ 8,782 $ 4,971 $ 2,723 $ 233 $ 62,337 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 1,239,954 $ 4,194,064 $ 2,021,953 $ 3,674,005 $ 1,464,064 $ 1,045,906 $ 0 $ 13,639,946 Ending Balance: individually evaluated for impairment $ 27,882 $ 29,559 $ 54,549 $ 20,267 $ 14,085 $ 0 $ 0 $ 146,342 Ending Balance: collectively evaluated for impairment $ 1,185,613 $ 4,147,831 $ 1,930,570 $ 3,642,859 $ 1,429,245 $ 1,045,906 $ 0 $ 13,381,993 Ending Balance: loans acquired with deteriorated credit quality $ 26,459 $ 16,674 $ 36,834 $ 10,879 $ 20,734 $ 31 $ 0 $ 111,611 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2018 Commercial Real Estate Construction Allowance for Owner- occupied Nonowner- occupied Other Commercial Residential Real Estate & Land Development Consumer Estimated Imprecision Total Allowance for Loan Losses: Beginning balance $ 5,401 $ 6,369 $ 45,189 $ 9,927 $ 7,187 $ 2,481 $ 73 $ 76,627 Charge-offs 3,225 314 16,424 3,162 2,731 2,750 0 28,606 Recoveries 1,189 563 2,944 1,114 197 662 0 6,669 Provision 1,698 301 9,632 4,569 3,339 2,302 172 22,013 Ending balance $ 5,063 $ 6,919 $ 41,341 $ 12,448 $ 7,992 $ 2,695 $ 245 $ 76,703 Ending Balance: individually $ 2,543 $ 2,715 $ 17,581 $ 3,265 $ 2,254 $ 0 $ 0 $ 28,358 Ending Balance: collectively evaluated for impairment $ 2,520 $ 4,204 $ 23,760 $ 9,183 $ 5,738 $ 2,695 $ 245 $ 48,345 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2019 Commercial Real Estate Construction Allowance Owner- Nonowner- Other Residential & Land Consumer Estimated Total Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 1,291,790 $ 4,303,613 $ 1,957,641 $ 3,501,393 $ 1,410,468 $ 964,627 $ 0 $ 13,429,532 Ending Balance: individually evaluated for impairment $ 27,599 $ 25,231 $ 72,300 $ 21,998 $ 14,807 $ 0 $ 0 $ 161,935 Ending Balance: collectively evaluated for impairment $ 1,234,919 $ 4,215,060 $ 1,860,085 $ 3,468,356 $ 1,374,840 $ 964,600 $ 0 $ 13,117,860 Ending Balance: loans acquired with deteriorated credit quality $ 29,272 $ 63,322 $ 25,256 $ 11,039 $ 20,821 $ 27 $ 0 $ 149,737

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	6. INTANGIBLE ASSETS The following is a summary of intangible assets subject to amortization and those not subject to amortization: June 30, 2019 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 98,359 $ ( 66,000 ) $ 0 $ 0 $ 98,359 $ ( 66,000 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Goodwill not subject to amortization $ 1,472,699 $ 5,315 $ 1,478,014 December 31, 2018 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 98,359 $ ( 62,492 ) $ 0 $ 0 $ 98,359 $ ( 62,492 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Goodwill not subject to amortization $ 1,472,699 $ 5,315 $ 1,478,014 The following table provides a reconciliation of goodwill: Community Mortgage Total Goodwill at December 31, 2018 $ 1,472,699 $ 5,315 $ 1,478,014 Additions to goodwill 0 0 0 Goodwill at June 30, 2019 $ 1,472,699 $ 5,315 $ 1,478,014 United incurred amortization expense on intangible assets of $1,754 and $3,508 for the quarter and six months ended June 30, 2019, respectively, and $2,010 and $4,020 for the quarter and six months ended June 30, 2018, respectively. The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2018: Year Amount 2019 $ 7,016 2020 6,309 2021 5,369 2022 4,581 2023 and thereafter 12,592

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	7. 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 not United’s operating leases are subject to renewal options under various terms. United’s operating leases have remaining terms of 1 to 14 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 The components of lease expense were as follows: Three Months Ended Six Months Ended Classification June 30, 2019 June 30, 2019 Operating lease cost Net occupancy expense $ 4,886 $ 9,707 Sublease income Net occupancy expense (197 ) (473 ) Net lease cost $ 4,689 $ 9,234 Supplemental balance sheet information related to leases was as follows: Classification June 30, 2019 Operating lease right-of-use Operating lease right-of-use $ 63,113 Operating lease liabilities Operating lease liabilities $ 66,821 Other information related to leases was as follows: June 30, 2019 Weighted-average remaining lease term: Operating leases 5.0 years Weighted-average discount rate: Operating leases 3.25 % Supplemental cash flow information related to leases was as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 4,931 $ 9,649 ROU assets obtained in the exchange for lease 4,214 4,416 Maturities of lease liabilities by year and in the aggregate, under operating leases with initial or remaining terms of one year or more, for years subsequent to December 31, 2018, consists of the following as of June 30, 2019 and December 31, 2018: Amount Year As of June 30, 2019 As of December 31, 2018 2019 $ 9,618 $ 18,590 2020 17,249 16,359 2021 14,672 13,850 2022 11,008 10,269 2023 8,231 7,600 Thereafter 11,966 10,640 Total lease payments 72,744 77,308 Less: imputed interest (5,923 ) (0 ) Total $ 66,821 $ 77,308

Short-Term Borrowings

Short-Term Borrowings	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Short-Term Borrowings	8. 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, 2019, United did no 122,159 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 no

Long-Term Borrowings

Long-Term Borrowings	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Long-Term Borrowings	9. 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, 2019, United had an unused borrowing amount of approximately $3,905,439 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, 2019, $1,548,032 of FHLB advances with a weighted-average interest rate of 2.22% are scheduled to mature within the next six years. The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2019 $ 471,000 2020 442,000 2021 602,845 2022 21,000 2023 and thereafter 11,187 Total $ 1,548,032 At June 30, 2019, United had a total of fourteen 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, 2019 and December 31, 2018, the outstanding balance of the Debentures was $235,535 and $234,905, respectively, and was included in the category of long-term debt on the Consolidated Balance Sheets entitled “Other long-term borrowings.” The Capital Securities are not included as a component of shareholders’ equity in the Consolidated Balance Sheets. United fully and unconditionally guarantees each individual trust’s obligations under the Capital Securities. Under the provisions of the subordinated debt, United has the right to defer payment of interest on the subordinated debt at any time, or from time to time, for periods not exceeding five years. If interest payments on the subordinated debt are deferred, the dividends on the Capital Securities are also deferred. Interest on the subordinated debt is cumulative.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	10. COMMITMENTS AND CONTINGENT LIABILITIES 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 $3,909,612 and $3,826,370 of loan commitments outstanding as of June 30, 2019 and December 31, 2018, respectively, approximately half of which contractually expire within one year. Included in the June 30, 2019 amount are commitments to extend credit of $354,996 related to George Mason’s mortgage loan funding commitments and are of a short-term nature. Commercial and standby letters of credit are agreements used by United’s customers as a means of improving their credit standing in their dealings with others. Under these agreements, United guarantees certain financial commitments of its customers. A commercial letter of credit is issued specifically to facilitate trade or commerce. Typically, under the terms of a commercial letter of credit, a commitment is drawn upon when the underlying transaction is consummated as intended between the customer and a third party. As of June 30, 2019, United had $5,092 of commercial letters of credit outstanding. As of December 31, 2018, United had no George Mason 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. George Mason has a reserve of $946 as of June 30, 2019. United has derivative counter-party risk that may arise from the possible inability of George Mason’s third party investors to meet the terms of their forward sales contracts. George Mason 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. 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.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	11. DERIVATIVE FINANCIAL INSTRUMENTS United uses derivative instruments to help aid against adverse price changes or interest rate movements on the value of certain assets or liabilities and on future cash flows. These derivatives may consist of interest rate swaps, caps, floors, collars, futures, forward contracts, written and purchased options. United also executes derivative instruments with its commercial banking customers to facilitate its risk management strategies. United accounts for its derivative financial instruments in accordance with ASC Topic 815 which requires all derivative instruments to be carried at fair value on the balance sheet. United has designated certain derivative instruments used to manage interest rate risk as hedge relationships with certain assets, liabilities or cash flows being hedged. Certain derivatives used for interest rate risk management are not designated in a hedge relationship. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. For a fair value hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to the hedged financial instrument. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a fair value hedge are recorded in income in the same period and in the same income statement line as changes in the fair values of the hedged items that relate to the hedged risk(s). For a cash flow hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to other comprehensive income within shareholders’ equity, net of tax. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a cash flow hedge are recorded as a component of other comprehensive income, net of deferred taxes, and reclassified to earnings when the hedged transaction affects earnings. The portion of a hedge that is ineffective is recognized immediately in earnings. At inception of a hedge relationship, United formally documents the hedged item, the particular risk management objective, the nature of the risk being hedged, the derivative being used, how effectiveness of the hedge will be assessed and how the ineffectiveness of the hedge will be measured. United also assesses hedge effectiveness at inception and on an ongoing basis using regression analysis. Hedge ineffectiveness is measured by using the change in fair value method. The change in fair value method compares the change in the fair value of the hedging derivative to the change in the fair value of the hedged exposure, attributable to changes in the benchmark rate. The portion of a hedge that is ineffective is recognized immediately in earnings. United through George Mason enters into interest rate lock commitments to finance residential mortgage loans with its customers. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by United. Interest rate risk arises on these commitments and subsequently closed loans if interest rates change between the time of the interest rate lock and the delivery of the loan to the investor. Market risk on interest rate lock commitments and mortgage loans held for sale is managed using corresponding forward mortgage loan sales contracts. United is a party to these forward mortgage loan sales contracts to sell loans servicing released and short sales of mortgage-backed securities. When the interest rate is locked with the borrower, the rate lock commitment, forward sale agreement, and mortgage-backed security position are undesignated derivatives and marked to fair value through earnings. The fair value of the rate lock derivative includes the servicing premium and the interest spread for the difference between retail and wholesale mortgage rates. Income from mortgage banking activities includes the gain recognized for the period presented and associated elements of fair value. United sells mortgage loans on either a best efforts or mandatory delivery basis. For loans sold on a mandatory delivery basis, United enters into forward mortgage-backed securities (the “residual hedge”) to mitigate the effect of interest rate risk. Both the rate lock commitment under mandatory delivery and the residual hedge are recorded at fair value through earnings and are not designated as accounting hedges. At the closing of the loan, the loan commitment derivative expires and United records a loan held for sale at fair value and continues to mark these assets to market under the election of fair value option. United closes out of the trading mortgage-backed securities assigned within the residual hedge and replaces the securities with a forward sales contract once a price has been accepted by an investor and recorded at fair value. For those loans selected to be sold under best efforts delivery, at the closing of the loan, the rate lock commitment derivative expires and the Company records a loan held for sale at fair value under the election of fair value option and continues to be obligated under the same forward loan sales contract entered into at inception of the rate lock commitment. The derivative portfolio also includes derivative financial instruments not included in hedge relationships. These derivatives consist of interest rate swaps used for interest rate management purposes and derivatives executed with commercial banking customers to facilitate their interest rate management strategies. For 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 fair value. Gains and losses on other derivative financial instruments are included in noninterest income and noninterest expense, respectively. 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, 2019 and December 31, 2018. Asset Derivatives June 30, 2019 December 31, 2018 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives designated as hedging instruments Fair Value Hedges: Interest rate swap contracts (hedging commercial loans) Other assets $ 0 $ 0 Other assets $ 85,623 $ 1,859 Total derivatives designated as hedging instruments $ 0 $ 0 $ 85,623 $ 1,859 Derivatives not designated as hedging instruments Interest rate swap contracts Other assets $ 0 $ 0 Other assets $ 0 $ 0 Forward loan sales commitments Other assets 48,488 492 Other assets 21,604 542 Interest rate lock commitments Other assets 250,487 8,127 Other assets 93,955 4,103 Total derivatives not designated as hedging instruments $ 298,975 $ 8,619 $ 115,559 $ 4,645 Total asset derivatives $ 298,975 $ 8,619 $ 201,182 $ 6,504 Liability Derivatives June 30, 2019 December 31, 2018 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives designated as hedging instruments Fair Value Hedges: Interest rate swap contracts (hedging commercial loans) Other liabilities $ 84,397 $ 2,146 Other liabilities $ 0 $ 0 Total derivatives designated as hedging instruments $ 84,397 $ 2,146 $ 0 $ 0 Derivatives not designated as hedging instruments Interest rate swap contracts Other liabilities $ 0 $ 0 Other liabilities $ 0 $ 0 TBA mortgage-backed securities Other liabilities 405,299 3,476 Other liabilities 200,281 3,002 Interest rate lock commitments Other liabilities 0 0 Other liabilities 0 0 Total derivatives not designated as hedging instruments $ 405,299 $ 3,476 $ 200,281 $ 3,002 Total liability derivatives $ 489,696 $ 5,622 $ 200,281 $ 3,002 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, 2019. Derivatives in Fair Value Hedging Relationships Location in the Statement June 30, 2019 Carrying Amount Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 83,527 $ (2,146 ) $ 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, 2019 and 2018 are presented as follows: Three Months Ended Income Statement Location June 30, June 30, Derivatives in hedging relationships Fair Value Hedges: Interest rate swap contracts Interest income/(expense) $ (68 ) $ 24 Total derivatives in hedging relationships $ (68 ) $ 24 Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities 492 112 TBA mortgage-backed securities Income from Mortgage Banking Activities (962 ) (660 ) Interest rate lock commitments Income from Mortgage Banking Activities 3,833 2,888 Total derivatives not designated as hedging instruments $ 3,363 $ 2,340 Total derivatives $ 3,295 $ 2,364 Six Months Ended Income Statement Location June 30, June 30, Derivatives in fair value hedging relationships Fair Value Hedges: Interest rate swap contracts Interest income/(expense) $ (98 ) $ (18 ) Cash Flow Hedges: Forward loan sales commitments Other income 0 0 Total derivatives in hedging relationships $ (98 ) $ (18 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities 872 185 TBA mortgage-backed securities Income from Mortgage Banking Activities (474 ) (1,110 ) Interest rate lock commitments Income from Mortgage Banking Activities 5,870 1,619 Total derivatives not designated as hedging instruments $ 6,268 $ 694 Total derivatives $ 6,170 $ 676

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	12. FAIR VALUE M EASUREMENTS United determines the fair values of its financial instruments based on the fair value hierarchy established by ASC Topic 820, which also clarifies that fair value of certain assets and liabilities is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The Fair Value Measurements and Disclosures Topic specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect United’s market assumptions. The three levels of the fair value hierarchy, based on these two types of inputs, are as follows: Level 1 - Valuation is based on quoted prices in active markets for identical assets and liabilities. Level 2 - Valuation is based on observable inputs including quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets and liabilities in less active markets, and model-based valuation techniques for which significant assumptions can be derived primarily from or corroborated by observable data in the market. Level 3 - Valuation is based on prices, inputs and model-based techniques that use one or more significant inputs or assumptions that are unobservable in the market. When determining the fair value measurements for assets and liabilities, United looks to active and observable markets to price identical assets or liabilities whenever possible and classifies such items in Level 1. When identical assets and liabilities are not not not not 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 June , . Management utilizes a number of factors to determine if a market is inactive, all of which may require a significant level of judgment. Factors that management considers include: a significant widening 40 of the bid-ask spread, a considerable decline in the volume and level of trading activity in the instrument, a significant variance in prices among market participants, and a significant reduction in the level of observable inputs. Any securities available for sale not valued based upon quoted market prices or third party pricing models that consider observable market data are considered Level . Currently, United considers its valuation of available for sale Trup Cdos as Level . Based upon management’s review of the market conditions for Trup Cdos, it was determined that an income approach valuation technique (present value technique) that maximizes the use of relevant observable inputs and minimizes the use of unobservable inputs is the most representative measurement technique for these securities. The present value technique discounts expected future cash flows of a security to arrive at a present value. Management considers the following items when calculating the appropriate discount rate: the implied rate of return when the market was last active, changes in the implied rate of return as markets moved from very active to inactive, recent changes in credit ratings, and recent activity showing that the market has built in increased liquidity and credit premiums. Management’s internal credit review of each security was also factored in to determine the appropriate discount rate. The credit review considered each security’s collateral, subordination, excess spread, priority of claims, principal and interest. Loans held for sale Derivatives For a fair value hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to the hedged financial instrument. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a fair value hedge are offset in current period earnings either in interest income or interest expense depending on the nature of the hedged financial instrument. For a cash flow hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to other comprehensive income within shareholders’ equity, net of tax. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a cash flow hedge are offset to other comprehensive income, net of tax. The portion of a hedge that is ineffective is recognized immediately in earnings. The Company records its interest rate lock commitments and forward loan sales commitments at fair value determined as the amount that would be required to settle each of these derivative financial instruments at the balance sheet date. In the normal course of business, George Mason enters into contractual interest rate lock commitments to extend credit to borrowers with fixed expiration dates. The commitments become effective when the borrowers “lock-in” a specified interest rate within the timeframes established by the mortgage companies. All borrowers are evaluated for credit worthiness prior to the extension of the commitment. Market risk arises if interest rates move adversely between the time of the interest rate lock by the borrower and the sale date of the loan to the investor. To mitigate the effect of the interest rate risk inherent in providing rate lock commitments to borrowers, George Mason enters into either a forward sales contract to sell loans to investors when using best efforts or a TBA mortgage-backed security under mandatory delivery. As TBA mortgage-backed securities are actively traded in an open market, TBA mortgage-backed securities fall into a Level 2 category. The forward sales contracts lock in an interest rate and price for the sale of loans similar to the specific rate lock commitments. Under the Company’s best efforts model, the rate lock commitments to borrowers and the forward sales contracts to investors through to the date the loan closes are undesignated derivatives and accordingly, are marked to fair value through earnings. These valuations fall into a Level 2 category. For residential mortgage loans sold in the mortgage banking segment, the interest rate lock commitments are recorded at fair value which is measured using valuations from investors for loans with similar characteristics adjusted for the Company’s actual sales experience versus the investor’s indicated pricing. These valuations fall into the Level 3 category. The unobservable input is the Company’s historical sales prices. The range of historical sales prices increased the investor’s indicated pricing by a range of 0.16% to 0.71% with a weighted average increase of 0.33%. 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, 2019 and December 31, 2018, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2019 Using Description Balance as of June 30, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale debt securities: U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 74,484 $ 0 $ 74,484 $ 0 State and political subdivisions 181,259 0 181,259 0 Residential mortgage-backed securities Agency 877,567 0 877,567 0 Non-agency 3,978 0 3,978 0 Commercial mortgage-backed securities Agency 574,721 0 574,721 0 Asset-backed securities 268,854 0 268,854 0 Trust preferred collateralized debt obligations 5,413 0 0 5,413 Single issue trust preferred securities 16,844 0 16,844 0 Other corporate securities 342,671 6,712 335,959 0 Total available for sale securities 2,345,791 6,712 2,333,666 5,413 Equity securities: Financial services industry 133 133 0 0 Equity mutual funds (1) 4,209 4,209 0 0 Other equity securities 4,756 4,756 0 0 Total equity securities 9,098 9,098 0 0 Fair Value at June 30, 2019 Using Description Balance as of June 30, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Loans held for sale 365,440 0 0 365,440 Derivative financial assets: Interest rate swap contracts 0 0 0 0 Forward sales commitments 492 0 492 0 Interest rate lock commitments 8,127 0 0 8,127 Total derivative financial assets 8,619 0 492 8,127 Liabilities Derivative financial liabilities: Interest rate swap contracts 2,146 0 2,146 0 TBA mortgage-backed securities 3,476 0 3,476 0 Total derivative financial liabilities 5,622 0 5,622 0 (1) The equity mutual funds are within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries. Fair Value at December 31, 2018 Using Description Balance as of December 31, 2018 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 $ 85,890 $ 0 $ 85,890 $ 0 State and political subdivisions 208,988 0 208,988 0 Residential mortgage-backed securities Agency 1,035,650 0 1,035,650 0 Non-agency 4,259 0 4,259 0 Commercial mortgage-backed securities Agency 554,600 0 554,600 0 Asset-backed securities 271,970 0 271,970 0 Trust preferred collateralized debt obligations 5,917 0 0 5,917 Single issue trust preferred securities 8,362 0 8,362 0 Other corporate securities 161,403 6,822 154,581 0 Total available for sale securities 2,337,039 6,822 2,324,300 5,917 Equity securities: Financial services industry 140 140 0 0 Equity mutual funds (1) 4,954 4,954 0 0 Other equity securities 4,640 4,640 0 0 Total equity securities 9,734 9,734 0 0 Loans held for sale 247,104 0 0 247,104 Derivative financial assets: Interest rate swap contracts 1,859 0 1,859 0 Forward sales commitments 542 0 542 0 Interest rate lock commitments 4,103 0 0 4,103 Total derivative financial assets 6,504 0 2,401 4,103 Fair Value at December 31, 2018 Using Description Balance as of December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Liabilities Derivative financial liabilities: TBA mortgage-backed securities 3,002 0 3,002 0 Total derivative financial liabilities 3,002 0 3,002 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 The following table presents additional information about financial assets and liabilities measured at fair value at June 30, 2019 and December 31, 2018 on a recurring basis and for which United has utilized Level 3 inputs to determine fair value: Available for sale Securities Trust preferred collateralized debt obligations June 30, 2019 December 31, Balance, beginning of period $ 5,917 $ 34,269 Total gains or losses (realized/unrealized): Included in earnings (or changes in net assets) (53 ) 28 Included in other comprehensive income (451 ) 920 Purchases, issuances, and settlements 0 0 Sales 0 (29,300 ) Transfers in and/or out of Level 3 0 0 Balance, end of period $ 5,413 $ 5,917 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ 0 $ 0 Loans held for sale June 30, 2019 December 31, Balance, beginning of period $ 247,104 $ 263,308 Originations 1,256,514 2,619,454 Sales (1,177,754 ) (2,676,797 ) Total gains or losses during the period recognized in earnings 39,576 68,555 Transfers in and/or out of Level 3 0 (27,416 ) Balance, end of period $ 365,440 $ 247,104 Available for sale Securities Trust preferred collateralized debt obligations June 30, 2019 December 31, 2018 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 Commitments June 30, 2019 December 31, 2018 Balance, beginning of period $ 4,103 $ 4,559 Transfers other 4,024 (456 ) Balance, end of period $ 8,127 $ 4,103 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ 0 $ 0 Certain financial assets are measured at fair value on a nonrecurring basis in accordance with GAAP. Adjustments to the fair value of these assets usually result from the application of lower-of-cost-or-market accounting or write-downs of individual assets. Fair Value Option United elected the fair value option for the loans held for sale in its mortgage banking segment to mitigate a divergence between accounting losses and economic exposure. The following table reflects the change in fair value included in earnings of financial instruments for which the fair value option has been elected: Description Three Months Ended June 30, 2019 Three Months Ended June 30, 2018 Assets Loans held for sale Income from mortgage banking activities $ 4,578 $ 3,929 Description Six Months Ended June 30, 2019 Six Months Ended June 30, 2018 Assets Loans held for sale Income from mortgage banking activities $ 6,542 $ 3,092 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, 2019 December 31, 2018 Description Unpaid Fair Value Fair Value Unpaid Fair Value Fair Value Assets Loans held for sale $ 357,112 $ 365,440 $ 8,328 $ 241,293 $ 247,104 $ 5,811 Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis The following describes the valuation techniques used by United to measure certain financial assets recorded at fair value on a nonrecurring basis in the financial statements. Loans held for sale Impaired Loans OREO comparable property sales (Level 2). In contrast, valuation of ongoing construction assets requires some degree of professional judgment. In conducting an appraisal for ongoing construction property, the appraiser develops two appraised amounts: an “as is” appraised value and a “completed” value. Based on professional judgment and their knowledge of the particular situation, management determines the appropriate fair value to be utilized for such property (Level 3). As a matter of policy, valuations are reviewed at least annually and appraisals are generally updated on a bi-annual Intangible Assets: No The following table summarizes United’s financial assets that were measured at fair value on a nonrecurring basis during the period: Carrying value at June 30, 2019 Description Balance as of June 30, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD Gains (Losses) Assets Loans held for sale $ 5,153 $ 0 $ 5,153 $ 0 $ (4 ) Impaired Loans 76,577 0 65,604 10,973 4,781 OREO 14,469 0 14,391 78 (340 ) Carrying value at December 31, 2018 Description Balance as of December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD Gains (Losses) Assets Loans held for sale $ 2,742 $ 0 $ 2,742 $ 0 $ (3 ) Impaired Loans 121,355 0 108,899 12,456 (12,301 ) OREO 16,865 0 16,865 0 (910 ) Fair Value of Other Financial Instruments The following methods and assumptions were used by United in estimating its fair value disclosures for other financial instruments: Cash and Cash Equivalents: Securities held to maturity and other securities Loans one-to-four Deposits Short-term Borrowings: Long-term Borrowings: Summary of Fair Values for All Financial Instruments The estimated fair values of United’s financial instruments, including those measured at amortized cost on the balance sheet, are summarized below: Fair Value Measurements Carrying Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) June 30, 2019 Cash and cash equivalents $ 1,253,573 $ 1,253,573 $ 0 $ 1,253,573 $ 0 Securities available for sale 2,345,791 2,345,791 6,712 2,333,666 5,413 Securities held to maturity 6,461 6,483 0 5,463 1,020 Equity securities 9,098 9,098 9,098 0 0 Other securities 201,912 200,367 0 0 200,367 Loans held for sale 370,593 370,593 0 5,153 365,440 Loans 13,558,866 13,076,745 0 0 13,076,745 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) Derivative financial assets 8,619 8,619 0 492 8,127 Deposits 14,404,085 14,372,448 0 14,372,448 0 Short-term borrowings 122,159 122,159 0 122,159 0 Long-term borrowings 1,783,567 1,762,173 0 1,762,173 0 Derivative financial liabilities 5,622 5,622 0 5,622 0 December 31, 2018 Cash and cash equivalents $ 1,020,396 $ 1,020,396 $ 0 $ 1,020,396 $ 0 Securities available for sale 2,337,039 2,337,039 6,822 2,324,300 5,917 Securities held to maturity 19,999 18,655 0 15,635 3,020 Equity securities 9,734 9,734 9,734 0 0 Other securities 176,955 168,107 0 0 168,107 Loans held for sale 249,846 249,846 0 2,742 247,104 Loans 13,422,222 12,657,073 0 0 12,657,073 Derivative financial assets 6,504 6,504 0 2,401 4,103 Deposits 13,994,749 13,954,574 0 13,954,574 0 Short-term borrowings 351,327 351,327 0 351,327 0 Long-term borrowings 1,499,103 1,475,237 0 1,475,237 0 Derivative financial liabilities 3,002 3,002 0 3,002 0

Stock Based Compensation

Stock Based Compensation	6 Months Ended
	Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	13. STOCK BASED COMPENSATION On May 18, 2016, United’s shareholders approved the 2016 Long-Term Incentive Plan (2016 LTI Plan). The 2016 LTI Plan became effective as of May 18, 2016. An award granted under the 2016 LTI Plan may consist of any non-qualified Unless otherwise determined by the Board, the Compensation Committee of the Board (the Committee) shall administer the LTI Plan. Any and all shares may be issued in respect of any of the types of Awards, provided that the aggregate number of shares that may be issued in respect of restricted stock awards, and restricted stock unit awards which are settled in shares is , and the aggregate number of shares that may be issued pursuant to stock options is . The shares to be offered under the LTI Plan may be authorized and unissued shares or treasury shares. The maximum number of options and SARs, in the aggregate, which may be awarded to any individual key employee during any calendar year is . The maximum number of stock options and SARs, in the aggregate, which may be awarded to any non-employee director during any calendar year is . The maximum number of shares of restricted stock or shares subject to a restricted stock units award that may be granted during any calendar year is shares to any individual key employee and shares to any individual non-employee director. Subject to certain change in control provisions, the LTI Plan provides that awards of restricted stock and restricted stock units will vest as the Committee determines in the award agreement, provided that no awards will vest sooner than 1/3 per year over the first three anniversaries of the award. Awards granted to executive officers of United typically will have performance based vesting conditions. A Form S-8 was filed on July , with the Securities and Exchange Commission to register all the shares which were available for the LTI Plan. Compensation expense of $ and $ related to the nonvested awards under United’s Long-Term Incentive Plans was incurred for the second quarter and first six months of , respectively, as compared to the compensation expense of $ and $ related to the nonvested awards under United’s Long-Term Incentive Plans incurred for the second quarter and first six months of , 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 2016 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 A summary of activity under United’s stock option plans as of June 30, 2019, and the changes during the first six months of 2019 are presented below: Six Months Ended June 30, 2019 Weighted Average Shares Aggregate Remaining Exercise Outstanding at January 1, 2019 1,730,389 $ 32.43 Granted 240,205 38.49 Exercised (47,960 ) 21.92 Forfeited or expired (12,548 ) 35.27 Outstanding at June 30, 2019 1,910,086 $ 9,445,566 5.7 $ 33.43 Exercisable at June 30, 2019 1,314,149 $ 9,355,396 4.3 $ 30.76 The following table summarizes the status of United’s nonvested stock option awards during the first six months of 2019: Shares Weighted-Average Nonvested at January 1, 2019 575,672 $ 7.86 Granted 240,205 7.16 Vested (210,876 ) 7.74 Forfeited or expired (9,064 ) 7.65 Nonvested at June 30, 2019 595,937 $ 7.62 During the six months ended June 30, 2019 and 2018, 47,960 and 42,089 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, 2019 and 2018 were issued from authorized and unissued stock. The total intrinsic value of options exercised under the Plans during the six months ended June 30, 2019 and 2018 was $713 and $630 respectively. Restricted Stock Under the 2011 LTI Plan, United may award restricted common shares to key employees and non-employee four The following summarizes the changes to United’s restricted common shares for the period ended June 30, 2019: Number of Weighted-Average Outstanding at January 1, 2019 199,303 $ 39.67 Granted 126,427 38.49 Vested (73,535 ) 39.28 Forfeited (2,539 ) 39.49 Outstanding at June 30, 2019 249,656 $ 39.19

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Employee Benefit Plans	14. EMPLOYEE BENEFIT PLANS United has a defined benefit retirement plan covering qualified employees. Pension benefits are based on years of service and the average of the employee’s highest five consecutive plan years of basic compensation paid during the ten plan years preceding the date of determination. Contributions are intended to provide not only for benefits attributed to service to date, but also for those expected to be earned in the future. During the first half of 2018, United made discretionary contributions of $ 7,000 No In September of 2007, after a recommendation by United’s Pension Committee and approval by United’s Board of Directors, the United Bankshares, Inc. Pension Plan (the Plan) was amended to change the participation rules. The decision to change the participation rules for the Plan followed current industry trends, as many large and medium size companies had taken similar steps. The amendment provides that employees hired on or after October 1, 2007, will not be eligible to participate in the Plan. However, new employees will be eligible to participate in United’s Savings and Stock Investment 401(k) plan. This change had no impact on current employees hired prior to October 1, 2007 as they will continue to participate in the Plan, with no change in benefit provisions, and will continue to be eligible to participate in United’s Savings and Stock Investment 401(k) plan. Included in accumulated other comprehensive income at December 31, 2018 are unrecognized actuarial losses of $ 55,535 42,595 4,744 3,639 Net periodic pension cost for the three and six months ended June 30, 2019 and 2018 included the following components: Three Months Ended June 30 Six Months Ended June 30 2019 2018 2019 2018 Service cost $ 561 $ 666 $ 1,116 $ 1,324 Interest cost 1,459 1,308 2,901 2,603 Expected return on plan assets (2,356 ) (2,551 ) (4,686 ) (5,073 ) Recognized net actuarial loss 1,184 1,162 2,355 2,311 Net periodic pension (benefit) cost $ 848 $ 585 $ 1,686 $ 1,165 Weighted-Average Assumptions: Discount rate 4.52 % 3.83 % 4.52 % 3.83 % Expected return on assets 7.00 % 7.00 % 7.00 % 7.00 % Rate of compensation increase (prior to age 45) 3.50 % 3.50 % 3.50 % 3.50 % Rate of compensation increase 3.00 % 3.00 % 3.00 % 3.00 %

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	15. INCOME TAXES United records a liability for uncertain income tax positions based on a recognition threshold of more-likely-than-not, As of June 30, 2019 and 2018, the total amount of accrued interest related to uncertain tax positions was $ 726 721 United is currently open to audit under the statute of limitations by the Internal Revenue Service for the years ended December 31, 2015, 2016 and 2017 and certain State Taxing authorities for the years ended December 31, 2015 through 2017. United’s effective tax rate was 20.69 21.04 22.50 22.49

Comprehensive Income

Comprehensive Income	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Comprehensive Income	16. COMPREHENSIVE INCOME The components of total comprehensive income for the three and six months ended June 30, 2019 and 2018 are as follows: Three Months Ended Six Months Ended June 30 June 30 2019 2018 2019 2018 Net Income $ 67,207 $ 66,274 $ 130,849 $ 127,980 Available for sale (“AFS”) securities: AFS securities with OTTI charges during the period (75 ) 0 (75 ) 0 Related income tax effect 17 0 17 0 Less: OTTI charges recognized in net income 75 0 75 0 Related income tax benefit (17 ) 0 (17 ) 0 Reclassification of previous noncredit OTTI to credit OTTI 2,188 0 2,188 0 Related income tax benefit (510 ) 0 (510 ) 0 Net unrealized (losses) gains on AFS securities with OTTI 1,678 0 1,678 0 AFS securities – all other: Change in net unrealized gain on AFS securities arising during the period 21,141 (10,684 ) 43,379 (32,701 ) Related income tax effect (4,925 ) 4,162 (10,107 ) 9,292 Net reclassification adjustment for (gains) losses included in net income 130 27 (218 ) 176 Related income tax expense (benefit) (30 ) (6 ) 51 (41 ) 16,316 (6,501 ) 33,105 (23,274 ) Net effect of AFS securities on other comprehensive income 17,994 (6,501 ) 34,783 (23,274 ) Held to maturity (“HTM”) securities: Accretion on the unrealized loss for securities transferred from AFS to the HTM investment portfolio prior to call or maturity 0 2 0 4 Related income tax expense (0 ) (1 ) (0 ) (2 ) Net effect of HTM securities on other comprehensive income 0 1 0 2 Pension plan: Recognized net actuarial loss 1,184 1,162 2,355 2,311 Related income tax benefit (275 ) (110 ) (536 ) (526 ) Net effect of change in pension plan asset on other comprehensive income 909 1,052 1,819 1,785 Total change in other comprehensive income 18,903 (5,448 ) 36,602 (21,487 ) Total Comprehensive Income $ 86,110 $ 60,826 $ 167,451 $ 106,493 The components of accumulated other comprehensive income for the six months ended June 30, 2019 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2019 Unrealized Accretion on Defined Items Total Balance at January 1, 2019 ($ 18,289 ) ($ 50 ) ($ 36,680 ) ($ 57,019 ) Reclass due to adopting Accounting Standard Update 2017-12 0 50 0 50 Other comprehensive income before reclassification 33,272 0 0 33,272 Amounts reclassified from accumulated other comprehensive income 1,511 0 1,819 3,330 Net current-period other comprehensive income, net of tax 34,783 0 1,819 36,602 Balance at June 30, 2019 $ 16,494 $ 0 ($ 36,861 ) ($ 20,367 ) (a) All amounts are net-of-tax. Reclassifications out of Accumulated Other Comprehensive Income (AOCI) For the Six Months Ended​​​​​​​ June 30, 2019 Details about AOCI Components Amount Affected Line Item in the Statement Where Net Income is Presented Available for sale (“AFS”) securities: Reclassification of previous noncredit OTTI to credit OTTI $ 2,188 Net investment securities (losses) gains Net reclassification adjustment for losses (gains) included in net income (218 ) Net investment securities (losses) gains 1,970 Total before tax Related income tax effect (459 ) Tax expense 1,511 Net of tax Pension plan: Recognized net actuarial loss 2,355 (a) 2,355 Total before tax Related income tax effect (536 ) Tax expense 1,819 Net of tax Total reclassifications for the period $ 3,330 (a) This AOCI component is included in the net periodic pension cost (see Note 14, Employee Benefit Plans)

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	17. 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 2019 2018 2019 2018 Distributed earnings allocated to common stock $ 34,604 $ 35,516 $ 69,276 $ 71,195 Undistributed earnings allocated to common stock 32,446 30,637 61,276 56,557 Net earnings allocated to common shareholders $ 67,050 $ 66,153 $ 130,552 $ 127,752 Average common shares outstanding 101,773,643 104,682,910 101,833,880 104,770,681 Equivalents from stock options 274,202 269,878 265,929 287,333 Average diluted shares outstanding 102,047,845 104,952,788 102,099,809 105,058,014 Earnings per basic common share $ 0.66 $ 0.63 $ 1.28 $ 1.22 Earnings per diluted common share $ 0.66 $ 0.63 $ 1.28 $ 1.22

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	18. 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 fourteen 100 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 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 LIBOR + 2.85% January 23, 2034 United Statutory Trust V July 12, 2007 $ 50,000 3-month LIBOR + 1.55% October 1, 2037 United Statutory Trust VI September 20, 2007 $ 30,000 3-month LIBOR + 1.30% 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 LIBOR + 1.74% June 15, 2035 Premier Statutory Trust IV June 20, 2006 $ 14,000 3-month LIBOR + 1.55% September 23, 2036 Premier Statutory Trust V December 14, 2006 $ 10,000 3-month LIBOR + 1.61% March 1, 2037 Centra Statutory Trust I September 20, 2004 $ 10,000 3-month LIBOR + 2.29% September 20, 2034 Centra Statutory Trust II June 15, 2006 $ 10,000 3-month LIBOR + 1.65% July 7, 2036 Virginia Commerce Trust II December 19, 2002 $ 15,000 6-month LIBOR + 3.30% December 19, 2032 Virginia Commerce Trust III December 20, 2005 $ 25,000 3-month LIBOR + 1.42% February 23, 2036 Cardinal Statutory Trust I July 27, 2004 $ 20,000 3-month LIBOR + 2.40% September 15, 2034 UFBC Capital Trust I December 30, 2004 $ 5,000 3-month LIBOR + 2.10% March 15, 2035 United, through its banking subsidiary, also makes limited partner equity investments in various low income housing and community development partnerships sponsored by independent third-parties. United invests in these partnerships to either realize tax credits on its consolidated federal income tax return or for purposes of earning a return on its investment. These partnerships are considered VIEs as the limited partners lack a controlling financial interest in the entities through their inability to make decisions that have a significant effect on the operations and success of the partnerships. United’s limited partner interests in these entities is immaterial, however; these partnerships are not consolidated as United is not deemed to be the primary beneficiary. The following table summarizes quantitative information about United’s significant involvement in unconsolidated VIEs: As of June 30, 2019 As of December 31, 2018 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 257,888 $ 248,746 $ 9,142 $ 257,754 $ 248,741 $ 9,013 (1) Represents investment in VIEs.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Segment Information	19. 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 George Mason. The community banking segment provides the mortgage banking segment (George Mason) 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 LIBOR rate. These transactions are eliminated in the consolidation process. 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, 2019 and 2018 is as follows: At and For the Three Months Ended June 30, 2019 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 152,517 $ 111 $ (3,209 ) $ 1,134 $ 150,553 Provision for loans losses 5,417 0 0 0 5,417 Other income 18,398 23,501 53 (2,157 ) 39,795 Other expense 82,304 18,771 143 (1,023 ) 100,195 Income taxes 17,207 1,004 (682 ) 0 17,529 Net income (loss) $ 65,987 $ 3,837 $ (2,617 ) $ 0 $ 67,207 Total assets (liabilities) $ 19,735,901 $ 442,188 $ 16,729 $ (312,279 ) $ 19,882,539 Average assets (liabilities) 19,447,629 326,525 5,387 (263,687 ) 19,515,854 At and For the Three Months Ended June 30, 2018 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 149,448 $ 264 $ (3,032 ) $ 2,442 $ 149,122 Provision for loans losses 6,204 0 0 0 6,204 Other income 17,465 23,468 68 (4,994 ) 36,007 Other expense 76,495 21,225 (1,758 ) (2,552 ) 93,410 Income taxes 18,948 564 (271 ) 0 19,241 Net income (loss) $ 65,266 $ 1,943 $ (935 ) $ 0 $ 66,274 Total assets (liabilities) $ 19,112,133 $ 388,292 $ 10,895 $ (303,717 ) $ 19,207,603 Average assets (liabilities) 18,658,168 335,781 6,776 (288,341 ) 18,712,384 At and For the Six Months Ended June 30, 2019 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 298,407 $ 166 $ (6,532 ) $ 2,680 $ 294,721 Provision for loans losses 10,413 0 0 0 10,413 Other income 36,050 39,607 255 (4,894 ) 71,018 Other expense 158,298 33,613 (77 ) (2,214 ) 189,620 Income taxes 34,873 1,286 (1,302 ) 0 34,857 Net income (loss) $ 130,873 $ 4,874 $ (4,898 ) $ 0 $ 130,849 Total assets (liabilities) $ 19,735,901 $ 442,188 $ 16,729 $ (312,279 ) $ 19,882,539 Average assets (liabilities) 19,324,956 296,008 1,824 (239,281 ) 19,383,507 At and For the Six Months Ended June 30, 2018 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 295,070 $ 640 $ (5,626 ) $ 3,081 $ 293,165 Provision for loans losses 11,382 0 0 0 11,382 Other income 35,235 38,351 (754 ) (5,633 ) 67,199 Other expense 148,986 39,609 (2,181 ) (2,552 ) 183,862 Income taxes 38,224 (139 ) (945 ) 0 37,140 Net income (loss) $ 131,713 $ (479 ) $ (3,254 ) $ 0 $ 127,980 Total assets (liabilities) $ 19,112,133 $ 388,292 $ 10,895 $ (303,717 ) $ 19,207,603 Average assets (liabilities) 18,583,975 274,211 9,231 (238,796 ) 18,628,621

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated interim financial statements of United Bankshares, Inc. and Subsidiaries (“United” or “the Company”) have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States (GAAP) and with the instructions for Form 10-Q S-X. six-month 10-K. The accompanying consolidated interim financial statements include the accounts of United and its wholly owned subsidiaries. United operates in two business segments: community banking and mortgage banking. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements. Information is presented in these notes to the unaudited consolidated interim financial statements with dollars expressed in thousands, except per share or unless otherwise noted.
Recent Accounting Pronouncements	New Accounting Standards In April 2019, the Financial Accounting Standards Board (FASB) issued ASU No. 2019-04 “Codification Improvements to Topic 326, Financial Instruments – Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments.” The amendments clarify the scope of the credit losses standard and address issued related to accrued interest receivable balances, recoveries, variable interest rates and prepayments. The amendments also address partial-term fair valued hedges, fair value hedge basis adjustments. The amendments to the credit losses and hedging standards have the same effective dates as those standards, unless an entity has already adopted the standards. The amendments to recognition and measurement guidance are effective for fiscal years beginning after December 15, 2019; early adoption is permitted. Management is currently evaluating the possible impact this standard may have on the Company’s financial condition or results of operations. In August 2018, the FASB issued ASU No. 2018-14 “Compensation – Retirement Benefits – Defined Benefits – General (Topic 715-20): Disclosure Framework – Changes to the Disclosure Requirements for Defined Benefit Plans.” This update amends ASC Topic 715 to add, remove, and clarify disclosure requirements related to defined benefit pension and other post retirement plans. The ASU’s changes related to disclosures are part of the FASB’s disclosure framework project, which the FASB launched in 2014 to improve effectiveness of disclosures in notes to financial statements. ASU No. 2018-14 is effective for public companies for fiscal years, and interim fiscal periods within those fiscal years, beginning after December 15, 2020; early adoption is permitted. ASU No. 2018-14 is not expected to have a material impact on the Company’s financial condition or results of operations. In August 2018, the FASB issued ASU No. 2018-13 2018-13 2018-13 In June 2018, the FASB issued Accounting Standards Update (ASU) No. 2018-07 non-employees non-employee 2018-07 2018-07 In August 2017, the FASB issued ASU No. 2017-12, one-time 2017-12 one-time In July 2017, the FASB issued ASU No. 2017-11, “Part I, Accounting for Certain Financial Instruments with Down Round Features and Part II, Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling interests with a Scope Exception.” Part I of this ASU simplifies the accounting for financial instruments that include down round features while the amendments in Part II, which do not have an accounting effect, address the difficulty of navigating the guidance in ASC 480, “Distinguishing Liabilities from Equity”, due to the existence of extensive pending content in the Codification. ASU No. 2017-11 is effective for interim and annual reporting periods beginning after December 15, 2018. ASU No. 2017-11 was adopted by United on January 1, 2019. In March 2017, the FASB issued ASU No. 2017-08, “Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities.” This update amends the amortization period for certain purchased callable debt securities held at a premium. FASB is shortening the amortization period for the premium to the earliest call date. The amendments in this update became effective for annual reporting periods beginning after December 15, 2018, including interim reporting periods within those annual reporting periods. ASU No. 2017-08 was adopted by United on January 1, 2019. The adoption did not have a material impact on the Company’s financial condition or results of operations. In January 2017, the FASB issued ASU No. 2017-04, 2017-04 2017-04 In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments – Credit Losses.” ASU No. 2016-13 changes the impairment model for most financial assets and certain other instruments that aren’t measured at fair value through net income. The standard will replace today’s “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost and require entities to record allowances for available for sale debt securities rather than reduce the carrying amount under the current other-than-temporary impairment (OTTI) model. ASU No. 2016-13 also simplifies the accounting model for purchased credit-impaired debt securities and loans. Entities will apply the standard’s provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. In May 2019, the FASB issued Accounting Standards Update (ASU) No. 2019-05 “Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief.” ASU 2019-05 amends ASU 2016-13 to allow companies to irrevocably elect, upon adoption of ASU 2016-13, the fair value option on financial instruments that were previously recorded at amortized cost and are within the scope of ASC 326-20 if the instruments are eligible for the fair value option under ASC 825-10. The fair value option election does not apply to held-to-maturity debt securities. Entities are required to make this election on an instrument-by-instrument basis. ASU No. 2019-05 is effective on the same date as ASU No. 2016-13, which is January 1, 2020 for United, with early adoption permitted. United has completed an initial data gap assessment and loan segmentation procedures and is currently evaluating the various forecasting and modeling assumptions that will be used to estimate the initial current expected credit loss allowance. In addition, United is currently working through the implementation plan which includes documentation of methodologies, processes, data sources, internal controls and policies, as well as model development, documentation and validation. United has engaged a third-party service provider to assist with the implementation of the new accounting standard. Management is currently evaluating the possible impact this standard may have on the Company’s financial condition or results of operations. In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”. ASU No. 2016-02 includes a lessee accounting model that recognizes two types of leases, finance leases and operating leases, while lessor accounting will remain largely unchanged from the current GAAP. ASU No. 2016-02 requires, amongst other things, that a lessee recognize on the balance sheet a right-of-use asset and a lease liability for leases with terms of more than twelve months. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee will depend on its classification as a finance or operating lease. In July 2018, the FASB issued ASU No. 2018-11 “Leases (Topic 842), Targeted Improvements.” This update creates an additional transition method, and a lessor practical expedient to not separate lease and non-lease components if specified criteria are met. The new transition method allows companies to use the effective date of the new leases standard as the date of initial application transition. Companies that elect this transition option will not adjust their comparative period financial information for the effect of ASC Topic 842, nor will they make the new required lease disclosure for periods before the effective date. In addition, these companies will carry forward their ASC Topic 840 disclosures for comparative periods. The practical expedient permits lessors to make an accounting policy election by class of underlying asset to not separate lease and non-lease components if specified criteria are met. In July 2018, the FASB issued ASU No. 2018-10 “Codification Improvements to ASC Topic 842, Leases.” This update includes narrow amendments to clarify how to apply certain aspects of the new leases standard. The amendments address the rate implicit in the lease, impairment of the net investment in the lease, lessee reassessment of lease classification, lessor reassessment of lease term and purchase options, variable payments that depend on an index or rate and certain transition adjustments. ASU 2018-10 does not make any substantive changes to the core provisions or principals of the new leases standard. United adopted the standard using the modified retrospective transition method on January 1, 2019. The Company evaluated and elected the package of practical expedients, which allows for existing leases to be accounted for consistent with current guidance, with the exception of the balance sheet recognition for lessees. The Company has also elected the practical expedient on not separating lease and nonlease components and instead treating them as a single lease component. Adoption of the standard resulted in the recognition of additional net lease assets and lease liabilities of $ 67,040 70,692 1,049

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2019
Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities	The amortized cost and estimated fair values of securities available for sale are summarized as follows. June 30, 2019 Gross Gross Estimated Cumulative Amortized Unrealized Unrealized Fair OTTI in Cost Gains Losses Value AOCI (1) U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 73,369 $ 1,116 $ 1 $ 74,484 $ 0 State and political subdivisions 178,833 2,968 542 181,259 0 Residential mortgage-backed securities Agency 866,597 12,539 1,569 877,567 0 Non-agency 3,598 380 0 3,978 86 Commercial mortgage-backed securities Agency 566,366 8,738 383 574,721 0 Asset-backed securities 272,423 0 3,569 268,854 0 Trust preferred collateralized debt obligations 6,136 0 723 5,413 398 Single issue trust preferred securities 18,180 175 1,511 16,844 0 Other corporate securities 338,784 3,900 13 342,671 0 Total $ 2,324,286 $ 29,816 $ 8,311 $ 2,345,791 $ 484 December 31, 2018 Gross Gross Estimated Cumulative Amortized Unrealized Unrealized Fair OTTI in Cost Gains Losses Value AOCI (1) U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 86,285 $ 35 $ 430 $ 85,890 $ 0 State and political subdivisions 212,670 439 4,121 208,988 0 Residential mortgage-backed securities Agency 1,047,345 3,235 14,930 1,035,650 0 Non-agency 3,927 332 0 4,259 86 Commercial mortgage-backed securities Agency 560,634 996 7,030 554,600 0 Asset-backed securities 272,459 450 939 271,970 0 Trust preferred collateralized debt obligations 6,176 91 350 5,917 2,586 Single issue trust preferred securities 8,754 169 561 8,362 0 Other corporate securities 162,634 118 1,349 161,403 0 Total $ 2,360,884 $ 5,865 $ 29,710 $ 2,337,039 $ 2,672 (1) Non-credit before-tax.
Summary of Securities Available for Sale in an Unrealized Loss Position	The following is a summary of securities available for sale which were in an unrealized loss position at June 30, 2019 and December 31, 2018. Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses June 30, 2019 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 2,621 $ 1 State and political subdivisions 1,127 6 50,689 536 Residential mortgage-backed securities Agency 9,460 9 180,352 1,560 Non-agency 0 0 0 0 Commercial mortgage-backed securities Agency 42,489 47 110,943 336 Asset-backed securities 261,566 3,462 7,288 107 Trust preferred collateralized debt obligations 0 0 5,412 723 Single issue trust preferred securities 0 0 13,633 1,511 Other corporate securities 12,679 13 0 0 Total $ 327,321 $ 3,537 $ 370,938 $ 4,774 Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses December 31, 2018 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 66,072 $ 250 $ 7,374 $ 180 State and political subdivisions 53,421 544 94,337 3,577 Residential mortgage-backed securities Agency 195,009 1,597 508,041 13,333 Non-agency 0 0 0 0 Commercial mortgage-backed securities Agency 107,443 1,124 294,129 5,906 Asset-backed securities 151,427 939 0 0 Trust preferred collateralized debt obligations 0 0 2,150 350 Single issue trust preferred securities 0 0 5,163 561 Other corporate securities 129,709 1,233 6,879 116 Total $ 703,081 $ 5,687 $ 918,073 $ 24,023
Summary of Gains or Losses on Proceeds from Maturities, Sales and Calls of Available for Sale Securities by Specific Identification Method	The realized losses relate to sales of securities within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers and its subsidiaries. Three Months Ended June 30 Six Months Ended June 30 2019 2018 2019 2018 Proceeds from sales and calls $ 188,432 $ 75,157 $ 384,763 $ 174,860 Gross realized gains 739 58 754 1,221 Gross realized losses 608 85 972 1,397
Roll Forward of Credit Losses on Securities	Below is a progression of the credit losses on securities which United has recorded other-than-temporary charges. These charges were recorded through earnings and other comprehensive income. Three Months Ended June 30 Six Months Ended June 30 2019 2018 2019 2018 Balance of cumulative credit losses at beginning of period $ 3,138 $ 3,199 $ 3,138 $ 18,060 Additional credit losses on securities for which OTTI was previously recognized 54 0 54 0 Reductions for securities sold or paid off during the period 0 0 0 (14,861 ) Balance of cumulative credit losses at end of period $ 3,192 $ 3,199 $ 3,192 $ 3,199
Summary of Amortized Cost and Estimated Fair Values of Securities Held to Maturity	The amortized cost and estimated fair values of securities held to maturity are summarized as follows: June 30, 2019 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 5,015 $ 21 $ 0 $ 5,036 State and political subdivisions 1,426 1 0 1,427 Residential mortgage-backed securities Agency 0 0 0 0 Single issue trust preferred securities 0 0 0 0 Other corporate securities 20 0 0 20 Total $ 6,461 $ 22 $ 0 $ 6,483 December 31, 2018 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 5,074 $ 90 $ 0 $ 5,164 State and political subdivisions 5,473 7 1 5,479 Residential mortgage-backed securities Agency 20 2 0 22 Single issue trust preferred securities 9,412 0 1,442 7,970 Other corporate securities 20 0 0 20 Total $ 19,999 $ 99 $ 1,443 $ 18,655
Summary of Equity Securities	The fair value of United’s equity securities was $9,098 at June 30, 2019 and $9,734 at December 31, 2018. Three Months Ended June 30 Six Months Ended June 30 2019 2018 2019 2018 Net gains (losses) recognized during the period $ 55 $ (28 ) $ 244 $ (64 ) Net gains (losses) recognized during the period on equity securities sold 2 (4 ) 134 (2 ) Unrealized gains recognized during the period on equity securities still held at period end 64 11 122 50 Unrealized losses recognized during the period on equity securities still held at period end 11 35 12 112
Available-for-sale Securities [Member]
Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value	Expected maturities may differ from contractual maturities because the issuers may have the right to call or prepay obligations without penalties. June 30, 2019 December 31, 2018 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 150,318 $ 150,304 $ 77,534 $ 77,266 Due after one year through five years 560,933 567,674 518,975 514,734 Due after five years through ten years 519,370 527,238 483,567 477,135 Due after ten years 1,093,665 1,100,575 1,280,808 1,267,904 Total $ 2,324,286 $ 2,345,791 $ 2,360,884 $ 2,337,039
Held-to-maturity Securities [Member]
Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value	Expected maturities may differ from contractual maturities because the issuers may have the right to call or prepay obligations without penalties. June 30, 2019 December 31, 2018 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 5,225 $ 5,246 $ 7,913 $ 8,005 Due after one year through five years 216 217 1,059 1,061 Due after five years through ten years 0 0 8,030 7,134 Due after ten years 1,020 1,020 2,997 2,455 Total $ 6,461 $ 6,483 $ 19,999 $ 18,655

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Major Classes of Loans	Major classes of loans are as follows: June 30, 2019 December 31, Commercial, financial and agricultural: Owner-occupied commercial real estate $ 1,239,954 $ 1,291,790 Nonowner-occupied commercial real estate 4,194,064 4,303,613 Other commercial loans 2,021,953 1,957,641 Total commercial, financial & agricultural 7,455,971 7,553,044 Residential real estate 3,674,005 3,501,393 Construction & land development 1,464,064 1,410,468 Consumer: Bankcard 9,380 10,203 Other consumer 1,036,526 954,424 Total gross loans $ 13,639,946 $ 13,429,532
Activity for Accretable Yield	Activity for the accretable yield for the first six months of 2019 follows: Accretable yield at the beginning of the period $ 26,289 Accretion (including cash recoveries) (5,850 ) Additions 0 Net reclassifications to accretable from non-accretable 7,051 Disposals (including maturities, foreclosures, and charge-offs) (4,335 ) Accretable yield at the end of the period $ 23,155

Credit Quality (Tables)

Credit Quality (Tables)	6 Months Ended
	Jun. 30, 2019
Text Block [Abstract]
Schedule of Troubled Debt Restructurings, Segregated by Class of Loans	The following table sets forth United’s troubled debt restructurings that have been restructured during the three months ended June 30, 2019 and 2018, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2019 June 30, 2018 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate: Owner-occupied 1 $ 150 $ 150 0 $ 0 $ 0 Nonowner-occupied 0 0 0 0 0 0 Other commercial 1 559 559 4 9,571 9,571 Residential real estate 2 1,845 1,832 2 6,953 6,953 Construction & land 3 2,242 2,202 0 0 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total 7 $ 4,796 $ 4,743 6 $ 16,524 $ 16,524 The following table sets forth United’s troubled debt restructurings that have been restructured during the six months ended June 30, 2019 and 2018, segregated by class of loans: Troubled Debt Restructurings For the Six Months Ended June 30, 2019 June 30, 2018 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate: Owner-occupied 1 $ 150 $ 150 0 $ 0 $ 0 Nonowner-occupied 0 0 0 0 0 0 Other commercial 2 824 811 4 9,571 9,571 Residential real estate 3 2,258 2,234 2 6,953 6,953 Construction & land development 3 2,242 2,202 0 0 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total 9 $ 5,474 $ 5,397 6 $ 16,524 $ 16,524
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, 2019 and had charge-offs during the six months ended June 30, 2019. No troubled debt restructurings had charge-offs during the second quarter of 2019. Six Months Ended June 30, 2019 (In thousands) Number of Contracts Recorded Investment Troubled Debt Restructurings Commercial real estate: Owner-occupied 0 $ 0 Nonowner-occupied 0 0 Other commercial 1 1,321 Residential real estate 0 0 Construction & land development 0 0 Consumer: Bankcard 0 0 Other consumer 0 0 Total 1 $ 1,321
Schedule of Age Analysis of Past Due Loans, Segregated by Class of Loans	The following table sets forth United’s age analysis of its past due loans, segregated by class of loans: Age Analysis of Past Due Loans As of June 30, 2019 30-89 Days Past Due 90 Days or more Past Due Total Past Due Current & Other (1) Total Financing Receivables Recorded Investment >90 Days & Accruing Commercial real estate: Owner-occupied $ 11,074 $ 17,603 $ 28,677 $ 1,211,277 $ 1,239,954 $ 1,136 Nonowner-occupied 7,572 19,678 27,250 4,166,814 4,194,064 2,713 Other commercial 10,075 44,843 54,918 1,967,035 2,021,953 745 Residential real estate 33,514 32,418 65,932 3,608,073 3,674,005 7,069 Construction & land development 4,233 17,083 21,316 1,442,748 1,464,064 495 Consumer: Bankcard 450 129 579 8,801 9,380 129 Other consumer 8,011 684 8,695 1,027,831 1,036,526 442 Total $ 74,929 $ 132,438 $ 207,367 $ 13,432,579 $ 13,639,946 $ 12,729 (1) Other includes loans with a recorded investment of $ 111,611 310-30 Age Analysis of Past Due Loans As of December 31, 2018 30-89 Days Past Due 90 Days or more Past Due Total Past Due Current & Other (1) Total Financing Receivables Recorded Investment >90 Days & Accruing Commercial real estate: Owner-occupied $ 9,224 $ 17,742 $ 26,966 $ 1,264,824 $ 1,291,790 $ 629 Nonowner-occupied 16,108 18,092 34,200 4,269,413 4,303,613 1,171 Other commercial 13,556 46,040 59,596 1,898,045 1,957,641 2,850 Residential real estate 37,111 30,278 67,389 3,434,004 3,501,393 9,141 Construction & land development 8,462 19,412 27,874 1,382,594 1,410,468 680 Consumer: Bankcard 657 177 834 9,369 10,203 177 Other consumer 8,909 1,243 10,152 944,272 954,424 893 Total $ 94,027 $ 132,984 $ 227,011 $ 13,202,521 $ 13,429,532 $ 15,541 (1) Other includes loans with a recorded investment of $149,737 acquired and accounted for under ASC Topic 310-30 “Loans and Debt Securities Acquired with Deteriorated Credit Quality”.
Schedule of Nonaccrual Loans, Segregated by Class of Loans	The following table sets forth United’s nonaccrual loans, segregated by class of loans: Loans on Nonaccrual Status June 30, 2019 December 31, 2018 Commercial real estate: Owner-occupied $ 16,467 $ 17,113 Nonowner-occupied 16,965 16,921 Other commercial 44,098 43,190 Residential real estate 25,349 21,137 Construction & land development 16,588 18,732 Consumer: Bankcard 0 0 Other consumer 242 350 Total $ 119,709 $ 117,443
Schedule of Credit Quality Indicators Information, by Class of Loans	Credit Quality Indicators Corporate Credit Exposure As of June 30, 2019 Commercial Real Estate Other Construction & Land Development Owner- Nonowner- Grade: Pass $ 1,146,018 $ 4,080,814 $ 1,892,676 $ 1,377,072 Special mention 33,082 37,946 55,345 11,038 Substandard 60,854 75,304 73,497 75,954 Doubtful 0 0 435 0 Total $ 1,239,954 $ 4,194,064 $ 2,021,953 $ 1,464,064 As of December 31, 2018 Commercial Real Estate Other Construction & Land Owner- Nonowner- Grade: Pass $ 1,201,387 $ 4,161,149 $ 1,858,821 $ 1,330,899 Special mention 34,487 46,442 14,424 28,629 Substandard 55,916 96,022 81,946 50,940 Doubtful 0 0 2,450 0 Total $ 1,291,790 $ 4,303,613 $ 1,957,641 $ 1,410,468 Consumer Credit Exposure As of June 30, 2019 Residential Bankcard Other Grade: Pass $ 3,611,502 $ 8,801 $ 1,027,772 Special mention 15,833 450 8,015 Substandard 46,670 129 739 Doubtful 0 0 0 Total $ 3,674,005 $ 9,380 $ 1,036,526 As of December 31, 2018 Residential Bankcard Other Grade: Pass $ 3,436,584 $ 9,369 $ 944,241 Special mention 19,051 657 8,914 Substandard 45,758 177 1,269 Doubtful 0 0 0 Total $ 3,501,393 $ 10,203 $ 954,424
Schedule of Impaired Loans Information by Class of Loans	The following table sets forth United’s impaired loans information, by class of loans: Impaired Loans June 30, 2019 December 31, 2018 Recorded Unpaid Related Recorded Unpaid Related With no related allowance recorded: Commercial real estate: Owner-occupied $ 71,948 $ 73,267 $ 0 $ 63,633 $ 63,798 $ 0 Nonowner-occupied 50,228 50,294 0 98,845 98,904 0 Other commercial 63,121 68,326 0 40,291 50,459 0 Residential real estate 34,972 35,174 0 28,207 29,279 0 Construction & land development 36,868 43,318 0 37,174 40,459 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 31 31 0 27 27 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,942 $ 4,942 $ 1,390 $ 10,004 $ 10,004 $ 2,542 Nonowner-occupied 10,371 10,371 1,524 15,720 15,720 2,715 Other commercial 35,166 37,403 7,805 61,266 62,812 17,581 Residential real estate 12,013 13,618 1,390 19,623 22,064 3,265 Construction & land development 14,085 16,135 1,954 14,742 19,446 2,254 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 76,890 $ 78,209 $ 1,390 $ 73,637 $ 73,802 $ 2,542 Nonowner-occupied 60,599 60,665 1,524 114,565 114,624 2,715 Other commercial 98,287 105,729 7,805 101,557 113,271 17,581 Residential real estate 46,985 48,792 1,390 47,830 51,343 3,265 Construction & land development 50,953 59,453 1,954 51,916 59,905 2,254 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 31 31 0 27 27 0 Impaired Loans For the Three Months Ended June 30, 2019 June 30, 2018 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 70,051 $ 467 $ 74,330 $ 354 Nonowner-occupied 68,371 354 108,343 159 Other commercial 52,659 327 52,384 246 Residential real estate 32,287 158 24,220 85 Construction & land development 36,654 199 46,909 98 Consumer: Bankcard 0 0 0 0 Other consumer 29 0 32 0 Impaired Loans For the Three Months Ended June 30, 2019 June 30, 2018 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With an allowance recorded: Commercial real estate: Owner-occupied $ 5,212 $ 0 $ 5,319 $ 6 Nonowner-occupied 12,210 39 9,503 60 Other commercial 41,641 9 46,376 10 Residential real estate 14,451 48 11,992 11 Construction & land development 14,413 20 2,008 20 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 75,263 $ 467 $ 79,649 $ 360 Nonowner-occupied 80,581 393 117,846 219 Other commercial 94,300 336 98,760 256 Residential real estate 46,738 206 36,212 96 Construction & land development 51,067 219 48,917 118 Consumer: Bankcard 0 0 0 0 Other consumer 29 0 32 0 Impaired Loans For the Six Months Ended June 30, 2019 June 30, 2018 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 67,911 $ 911 $ 75,592 $ 739 Nonowner-occupied 78,529 708 116,941 328 Other commercial 48,536 614 50,587 470 Residential real estate 30,927 342 25,064 180 Construction & land development 36,828 417 48,699 197 Consumer: Bankcard 0 0 0 0 Other consumer 28 0 26 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 6,809 $ 0 $ 6,590 $ 31 Nonowner-occupied 13,380 84 8,934 119 Other commercial 48,183 49 51,088 28 Residential real estate 16,175 140 11,266 21 Construction & land development 14,522 40 1,800 40 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 74,720 $ 911 $ 82,182 $ 770 Nonowner-occupied 91,909 792 125,875 447 Other commercial 96,719 663 101,675 498 Residential real estate 47,102 482 36,330 201 Construction & land development 51,350 457 50,499 237 Consumer: Bankcard 0 0 0 0 Other consumer 28 0 26 0

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Schedule of Allowance for Loan Losses and Carrying Amount of Loans	A progression of the allowance for loan losses, by portfolio segment, for the periods indicated is summarized as follows: Allowance for Loan Losses For the Three Months Ended June 30, 2019 Commercial Real Estate Construction Allowance for Owner- occupied Nonowner- occupied Other Commercial Residential Real Estate & Land Development Consumer Estimated Imprecision Total Allowance for Loan Losses: Beginning balance $ 6,164 $ 6,718 $ 40,664 $ 13,022 $ 7,186 $ 2,748 $ 384 $ 76,886 Charge-offs 2,784 69 3,645 309 8 773 0 7,588 Recoveries 714 22 420 269 39 221 0 1,685 Provision 1,503 (630 ) 7,270 (2,810 ) (292 ) 527 (151 ) 5,417 Ending balance $ 5,597 $ 6,041 $ 44,709 $ 10,172 $ 6,925 $ 2,723 $ 233 $ 76,400 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2019 Commercial Real Estate Construction Allowance for Owner- occupied Nonowner- occupied Other Commercial Residential Real Estate & Land Development Consumer Estimated Imprecision Total Allowance for Loan Losses: Beginning balance $ 5,063 $ 6,919 $ 41,341 $ 12,448 $ 7,992 $ 2,695 $ 245 $ 76,703 Charge-offs 6,521 69 4,579 750 573 1,510 0 14,002 Recoveries 1,618 41 717 354 152 404 0 3,286 Provision 5,437 (850 ) 7,230 (1,880 ) (646 ) 1,134 (12 ) 10,413 Ending balance $ 5,597 $ 6,041 $ 44,709 $ 10,172 $ 6,925 $ 2,723 $ 233 $ 76,400 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2019 Commercial Real Estate Construction Allowance for Owner- Nonowner- Other Residential & Land Consumer Estimated Total Ending Balance: individually evaluated for impairment $ 1,390 $ 1,524 $ 7,805 $ 1,390 $ 1,954 $ 0 $ 0 $ 14,063 Ending Balance: collectively evaluated for impairment $ 4,207 $ 4,517 $ 36,904 $ 8,782 $ 4,971 $ 2,723 $ 233 $ 62,337 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 1,239,954 $ 4,194,064 $ 2,021,953 $ 3,674,005 $ 1,464,064 $ 1,045,906 $ 0 $ 13,639,946 Ending Balance: individually evaluated for impairment $ 27,882 $ 29,559 $ 54,549 $ 20,267 $ 14,085 $ 0 $ 0 $ 146,342 Ending Balance: collectively evaluated for impairment $ 1,185,613 $ 4,147,831 $ 1,930,570 $ 3,642,859 $ 1,429,245 $ 1,045,906 $ 0 $ 13,381,993 Ending Balance: loans acquired with deteriorated credit quality $ 26,459 $ 16,674 $ 36,834 $ 10,879 $ 20,734 $ 31 $ 0 $ 111,611 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2018 Commercial Real Estate Construction Allowance for Owner- occupied Nonowner- occupied Other Commercial Residential Real Estate & Land Development Consumer Estimated Imprecision Total Allowance for Loan Losses: Beginning balance $ 5,401 $ 6,369 $ 45,189 $ 9,927 $ 7,187 $ 2,481 $ 73 $ 76,627 Charge-offs 3,225 314 16,424 3,162 2,731 2,750 0 28,606 Recoveries 1,189 563 2,944 1,114 197 662 0 6,669 Provision 1,698 301 9,632 4,569 3,339 2,302 172 22,013 Ending balance $ 5,063 $ 6,919 $ 41,341 $ 12,448 $ 7,992 $ 2,695 $ 245 $ 76,703 Ending Balance: individually $ 2,543 $ 2,715 $ 17,581 $ 3,265 $ 2,254 $ 0 $ 0 $ 28,358 Ending Balance: collectively evaluated for impairment $ 2,520 $ 4,204 $ 23,760 $ 9,183 $ 5,738 $ 2,695 $ 245 $ 48,345 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2019 Commercial Real Estate Construction Allowance Owner- Nonowner- Other Residential & Land Consumer Estimated Total Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 1,291,790 $ 4,303,613 $ 1,957,641 $ 3,501,393 $ 1,410,468 $ 964,627 $ 0 $ 13,429,532 Ending Balance: individually evaluated for impairment $ 27,599 $ 25,231 $ 72,300 $ 21,998 $ 14,807 $ 0 $ 0 $ 161,935 Ending Balance: collectively evaluated for impairment $ 1,234,919 $ 4,215,060 $ 1,860,085 $ 3,468,356 $ 1,374,840 $ 964,600 $ 0 $ 13,117,860 Ending Balance: loans acquired with deteriorated credit quality $ 29,272 $ 63,322 $ 25,256 $ 11,039 $ 20,821 $ 27 $ 0 $ 149,737

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following is a summary of intangible assets subject to amortization and those not subject to amortization: June 30, 2019 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 98,359 $ ( 66,000 ) $ 0 $ 0 $ 98,359 $ ( 66,000 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Goodwill not subject to amortization $ 1,472,699 $ 5,315 $ 1,478,014 December 31, 2018 Community Banking Mortgage Banking Total Gross Accumulated Gross Accumulated Gross Accumulated Amortized intangible assets: Core deposit intangible assets $ 98,359 $ ( 62,492 ) $ 0 $ 0 $ 98,359 $ ( 62,492 ) Non-amortized George Mason trade name $ 0 $ 1,080 $ 1,080 Goodwill not subject to amortization $ 1,472,699 $ 5,315 $ 1,478,014
Reconciliation of Goodwill	The following table provides a reconciliation of goodwill: Community Mortgage Total Goodwill at December 31, 2018 $ 1,472,699 $ 5,315 $ 1,478,014 Additions to goodwill 0 0 0 Goodwill at June 30, 2019 $ 1,472,699 $ 5,315 $ 1,478,014
Schedule of Anticipated Amortization Expense	The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2018: Year Amount 2019 $ 7,016 2020 6,309 2021 5,369 2022 4,581 2023 and thereafter 12,592

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Components of Lease Expense	The components of lease expense were as follows: Three Months Ended Six Months Ended Classification June 30, 2019 June 30, 2019 Operating lease cost Net occupancy expense $ 4,886 $ 9,707 Sublease income Net occupancy expense (197 ) (473 ) Net lease cost $ 4,689 $ 9,234
Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases was as follows: Classification June 30, 2019 Operating lease right-of-use Operating lease right-of-use $ 63,113 Operating lease liabilities Operating lease liabilities $ 66,821
Other Information Related to Leases	Other information related to leases was as follows: June 30, 2019 Weighted-average remaining lease term: Operating leases 5.0 years Weighted-average discount rate: Operating leases 3.25 %
Supplemental Cash Flow Information Related to Leases	Supplemental cash flow information related to leases was as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 Cash paid for amounts in the measurement of lease liabilities: Operating cash flows from operating leases $ 4,931 $ 9,649 ROU assets obtained in the exchange for lease 4,214 4,416
Maturities of Lease Liabilities by Year	Maturities of lease liabilities by year and in the aggregate, under operating leases with initial or remaining terms of one year or more, for years subsequent to December 31, 2018, consists of the following as of June 30, 2019 and December 31, 2018: Amount Year As of June 30, 2019 As of December 31, 2018 2019 $ 9,618 $ 18,590 2020 17,249 16,359 2021 14,672 13,850 2022 11,008 10,269 2023 8,231 7,600 Thereafter 11,966 10,640 Total lease payments 72,744 77,308 Less: imputed interest (5,923 ) (0 ) Total $ 66,821 $ 77,308

Long-Term Borrowings (Tables)

Long-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Schedule of Maturities of Long-term Borrowings	The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2019 $ 471,000 2020 442,000 2021 602,845 2022 21,000 2023 and thereafter 11,187 Total $ 1,548,032

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 and December 31, 2018. Asset Derivatives June 30, 2019 December 31, 2018 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives designated as hedging instruments Fair Value Hedges: Interest rate swap contracts (hedging commercial loans) Other assets $ 0 $ 0 Other assets $ 85,623 $ 1,859 Total derivatives designated as hedging instruments $ 0 $ 0 $ 85,623 $ 1,859 Derivatives not designated as hedging instruments Interest rate swap contracts Other assets $ 0 $ 0 Other assets $ 0 $ 0 Forward loan sales commitments Other assets 48,488 492 Other assets 21,604 542 Interest rate lock commitments Other assets 250,487 8,127 Other assets 93,955 4,103 Total derivatives not designated as hedging instruments $ 298,975 $ 8,619 $ 115,559 $ 4,645 Total asset derivatives $ 298,975 $ 8,619 $ 201,182 $ 6,504 Liability Derivatives June 30, 2019 December 31, 2018 Balance Sheet Location Notional Amount Fair Value Balance Sheet Location Notional Amount Fair Value Derivatives designated as hedging instruments Fair Value Hedges: Interest rate swap contracts (hedging commercial loans) Other liabilities $ 84,397 $ 2,146 Other liabilities $ 0 $ 0 Total derivatives designated as hedging instruments $ 84,397 $ 2,146 $ 0 $ 0 Derivatives not designated as hedging instruments Interest rate swap contracts Other liabilities $ 0 $ 0 Other liabilities $ 0 $ 0 TBA mortgage-backed securities Other liabilities 405,299 3,476 Other liabilities 200,281 3,002 Interest rate lock commitments Other liabilities 0 0 Other liabilities 0 0 Total derivatives not designated as hedging instruments $ 405,299 $ 3,476 $ 200,281 $ 3,002 Total liability derivatives $ 489,696 $ 5,622 $ 200,281 $ 3,002
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, 2019. Derivatives in Fair Value Hedging Relationships Location in the Statement June 30, 2019 Carrying Amount Cumulative Amount Cumulative Amount of Interest rate swaps Loans, net of unearned income $ 83,527 $ (2,146 ) $ 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, 2019 and 2018 are presented as follows: Three Months Ended Income Statement Location June 30, June 30, Derivatives in hedging relationships Fair Value Hedges: Interest rate swap contracts Interest income/(expense) $ (68 ) $ 24 Total derivatives in hedging relationships $ (68 ) $ 24 Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities 492 112 TBA mortgage-backed securities Income from Mortgage Banking Activities (962 ) (660 ) Interest rate lock commitments Income from Mortgage Banking Activities 3,833 2,888 Total derivatives not designated as hedging instruments $ 3,363 $ 2,340 Total derivatives $ 3,295 $ 2,364 Six Months Ended Income Statement Location June 30, June 30, Derivatives in fair value hedging relationships Fair Value Hedges: Interest rate swap contracts Interest income/(expense) $ (98 ) $ (18 ) Cash Flow Hedges: Forward loan sales commitments Other income 0 0 Total derivatives in hedging relationships $ (98 ) $ (18 ) Derivatives not designated as hedging instruments Forward loan sales commitments Income from Mortgage Banking Activities 872 185 TBA mortgage-backed securities Income from Mortgage Banking Activities (474 ) (1,110 ) Interest rate lock commitments Income from Mortgage Banking Activities 5,870 1,619 Total derivatives not designated as hedging instruments $ 6,268 $ 694 Total derivatives $ 6,170 $ 676

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 and December 31, 2018, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2019 Using Description Balance as of June 30, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Available for sale debt securities: U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 74,484 $ 0 $ 74,484 $ 0 State and political subdivisions 181,259 0 181,259 0 Residential mortgage-backed securities Agency 877,567 0 877,567 0 Non-agency 3,978 0 3,978 0 Commercial mortgage-backed securities Agency 574,721 0 574,721 0 Asset-backed securities 268,854 0 268,854 0 Trust preferred collateralized debt obligations 5,413 0 0 5,413 Single issue trust preferred securities 16,844 0 16,844 0 Other corporate securities 342,671 6,712 335,959 0 Total available for sale securities 2,345,791 6,712 2,333,666 5,413 Equity securities: Financial services industry 133 133 0 0 Equity mutual funds (1) 4,209 4,209 0 0 Other equity securities 4,756 4,756 0 0 Total equity securities 9,098 9,098 0 0 Fair Value at June 30, 2019 Using Description Balance as of June 30, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Loans held for sale 365,440 0 0 365,440 Derivative financial assets: Interest rate swap contracts 0 0 0 0 Forward sales commitments 492 0 492 0 Interest rate lock commitments 8,127 0 0 8,127 Total derivative financial assets 8,619 0 492 8,127 Liabilities Derivative financial liabilities: Interest rate swap contracts 2,146 0 2,146 0 TBA mortgage-backed securities 3,476 0 3,476 0 Total derivative financial liabilities 5,622 0 5,622 0 (1) The equity mutual funds are within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries. Fair Value at December 31, 2018 Using Description Balance as of December 31, 2018 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 $ 85,890 $ 0 $ 85,890 $ 0 State and political subdivisions 208,988 0 208,988 0 Residential mortgage-backed securities Agency 1,035,650 0 1,035,650 0 Non-agency 4,259 0 4,259 0 Commercial mortgage-backed securities Agency 554,600 0 554,600 0 Asset-backed securities 271,970 0 271,970 0 Trust preferred collateralized debt obligations 5,917 0 0 5,917 Single issue trust preferred securities 8,362 0 8,362 0 Other corporate securities 161,403 6,822 154,581 0 Total available for sale securities 2,337,039 6,822 2,324,300 5,917 Equity securities: Financial services industry 140 140 0 0 Equity mutual funds (1) 4,954 4,954 0 0 Other equity securities 4,640 4,640 0 0 Total equity securities 9,734 9,734 0 0 Loans held for sale 247,104 0 0 247,104 Derivative financial assets: Interest rate swap contracts 1,859 0 1,859 0 Forward sales commitments 542 0 542 0 Interest rate lock commitments 4,103 0 0 4,103 Total derivative financial assets 6,504 0 2,401 4,103 Fair Value at December 31, 2018 Using Description Balance as of December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Liabilities Derivative financial liabilities: TBA mortgage-backed securities 3,002 0 3,002 0 Total derivative financial liabilities 3,002 0 3,002 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, 2019 and December 31, 2018 on a recurring basis and for which United has utilized Level 3 inputs to determine fair value: Available for sale Securities Trust preferred collateralized debt obligations June 30, 2019 December 31, Balance, beginning of period $ 5,917 $ 34,269 Total gains or losses (realized/unrealized): Included in earnings (or changes in net assets) (53 ) 28 Included in other comprehensive income (451 ) 920 Purchases, issuances, and settlements 0 0 Sales 0 (29,300 ) Transfers in and/or out of Level 3 0 0 Balance, end of period $ 5,413 $ 5,917 The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date $ 0 $ 0 Loans held for sale June 30, 2019 December 31, Balance, beginning of period $ 247,104 $ 263,308 Originations 1,256,514 2,619,454 Sales (1,177,754 ) (2,676,797 ) Total gains or losses during the period recognized in earnings 39,576 68,555 Transfers in and/or out of Level 3 0 (27,416 ) Balance, end of period $ 365,440 $ 247,104 Available for sale Securities Trust preferred collateralized debt obligations June 30, 2019 December 31, 2018 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 Commitments June 30, 2019 December 31, 2018 Balance, beginning of period $ 4,103 $ 4,559 Transfers other 4,024 (456 ) Balance, end of period $ 8,127 $ 4,103 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, 2019 Three Months Ended June 30, 2018 Assets Loans held for sale Income from mortgage banking activities $ 4,578 $ 3,929 Description Six Months Ended June 30, 2019 Six Months Ended June 30, 2018 Assets Loans held for sale Income from mortgage banking activities $ 6,542 $ 3,092
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, 2019 December 31, 2018 Description Unpaid Fair Value Fair Value Unpaid Fair Value Fair Value Assets Loans held for sale $ 357,112 $ 365,440 $ 8,328 $ 241,293 $ 247,104 $ 5,811
Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis	The following table summarizes United’s financial assets that were measured at fair value on a nonrecurring basis during the period: Carrying value at June 30, 2019 Description Balance as of June 30, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD Gains (Losses) Assets Loans held for sale $ 5,153 $ 0 $ 5,153 $ 0 $ (4 ) Impaired Loans 76,577 0 65,604 10,973 4,781 OREO 14,469 0 14,391 78 (340 ) Carrying value at December 31, 2018 Description Balance as of December 31, 2018 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD Gains (Losses) Assets Loans held for sale $ 2,742 $ 0 $ 2,742 $ 0 $ (3 ) Impaired Loans 121,355 0 108,899 12,456 (12,301 ) OREO 16,865 0 16,865 0 (910 )
Summary of Estimated Fair Values of Financial Instruments	The estimated fair values of United’s financial instruments, including those measured at amortized cost on the balance sheet, are summarized below: Fair Value Measurements Carrying Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) June 30, 2019 Cash and cash equivalents $ 1,253,573 $ 1,253,573 $ 0 $ 1,253,573 $ 0 Securities available for sale 2,345,791 2,345,791 6,712 2,333,666 5,413 Securities held to maturity 6,461 6,483 0 5,463 1,020 Equity securities 9,098 9,098 9,098 0 0 Other securities 201,912 200,367 0 0 200,367 Loans held for sale 370,593 370,593 0 5,153 365,440 Loans 13,558,866 13,076,745 0 0 13,076,745 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) Derivative financial assets 8,619 8,619 0 492 8,127 Deposits 14,404,085 14,372,448 0 14,372,448 0 Short-term borrowings 122,159 122,159 0 122,159 0 Long-term borrowings 1,783,567 1,762,173 0 1,762,173 0 Derivative financial liabilities 5,622 5,622 0 5,622 0 December 31, 2018 Cash and cash equivalents $ 1,020,396 $ 1,020,396 $ 0 $ 1,020,396 $ 0 Securities available for sale 2,337,039 2,337,039 6,822 2,324,300 5,917 Securities held to maturity 19,999 18,655 0 15,635 3,020 Equity securities 9,734 9,734 9,734 0 0 Other securities 176,955 168,107 0 0 168,107 Loans held for sale 249,846 249,846 0 2,742 247,104 Loans 13,422,222 12,657,073 0 0 12,657,073 Derivative financial assets 6,504 6,504 0 2,401 4,103 Deposits 13,994,749 13,954,574 0 13,954,574 0 Short-term borrowings 351,327 351,327 0 351,327 0 Long-term borrowings 1,499,103 1,475,237 0 1,475,237 0 Derivative financial liabilities 3,002 3,002 0 3,002 0

Stock Based Compensation (Table

Stock Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option Plans	A summary of activity under United’s stock option plans as of June 30, 2019, and the changes during the first six months of 2019 are presented below: Six Months Ended June 30, 2019 Weighted Average Shares Aggregate Remaining Exercise Outstanding at January 1, 2019 1,730,389 $ 32.43 Granted 240,205 38.49 Exercised (47,960 ) 21.92 Forfeited or expired (12,548 ) 35.27 Outstanding at June 30, 2019 1,910,086 $ 9,445,566 5.7 $ 33.43 Exercisable at June 30, 2019 1,314,149 $ 9,355,396 4.3 $ 30.76
Changes to United's Restricted Common Shares	The following table summarizes the status of United’s nonvested stock option awards during the first six months of 2019: Shares Weighted-Average Nonvested at January 1, 2019 575,672 $ 7.86 Granted 240,205 7.16 Vested (210,876 ) 7.74 Forfeited or expired (9,064 ) 7.65 Nonvested at June 30, 2019 595,937 $ 7.62
Status of United's Nonvested Stock Option Awards	Number of Weighted-Average Outstanding at January 1, 2019 199,303 $ 39.67 Granted 126,427 38.49 Vested (73,535 ) 39.28 Forfeited (2,539 ) 39.49 Outstanding at June 30, 2019 249,656 $ 39.19

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Net Periodic Pension Cost	Net periodic pension cost for the three and six months ended June 30, 2019 and 2018 included the following components: Three Months Ended June 30 Six Months Ended June 30 2019 2018 2019 2018 Service cost $ 561 $ 666 $ 1,116 $ 1,324 Interest cost 1,459 1,308 2,901 2,603 Expected return on plan assets (2,356 ) (2,551 ) (4,686 ) (5,073 ) Recognized net actuarial loss 1,184 1,162 2,355 2,311 Net periodic pension (benefit) cost $ 848 $ 585 $ 1,686 $ 1,165 Weighted-Average Assumptions: Discount rate 4.52 % 3.83 % 4.52 % 3.83 % Expected return on assets 7.00 % 7.00 % 7.00 % 7.00 % Rate of compensation increase (prior to age 45) 3.50 % 3.50 % 3.50 % 3.50 % Rate of compensation increase 3.00 % 3.00 % 3.00 % 3.00 %

Comprehensive Income (Tables)

Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Components of Total Comprehensive Income	The components of total comprehensive income for the three and six months ended June 30, 2019 and 2018 are as follows: Three Months Ended Six Months Ended June 30 June 30 2019 2018 2019 2018 Net Income $ 67,207 $ 66,274 $ 130,849 $ 127,980 Available for sale (“AFS”) securities: AFS securities with OTTI charges during the period (75 ) 0 (75 ) 0 Related income tax effect 17 0 17 0 Less: OTTI charges recognized in net income 75 0 75 0 Related income tax benefit (17 ) 0 (17 ) 0 Reclassification of previous noncredit OTTI to credit OTTI 2,188 0 2,188 0 Related income tax benefit (510 ) 0 (510 ) 0 Net unrealized (losses) gains on AFS securities with OTTI 1,678 0 1,678 0 AFS securities – all other: Change in net unrealized gain on AFS securities arising during the period 21,141 (10,684 ) 43,379 (32,701 ) Related income tax effect (4,925 ) 4,162 (10,107 ) 9,292 Net reclassification adjustment for (gains) losses included in net income 130 27 (218 ) 176 Related income tax expense (benefit) (30 ) (6 ) 51 (41 ) 16,316 (6,501 ) 33,105 (23,274 ) Net effect of AFS securities on other comprehensive income 17,994 (6,501 ) 34,783 (23,274 ) Held to maturity (“HTM”) securities: Accretion on the unrealized loss for securities transferred from AFS to the HTM investment portfolio prior to call or maturity 0 2 0 4 Related income tax expense (0 ) (1 ) (0 ) (2 ) Net effect of HTM securities on other comprehensive income 0 1 0 2 Pension plan: Recognized net actuarial loss 1,184 1,162 2,355 2,311 Related income tax benefit (275 ) (110 ) (536 ) (526 ) Net effect of change in pension plan asset on other comprehensive income 909 1,052 1,819 1,785 Total change in other comprehensive income 18,903 (5,448 ) 36,602 (21,487 ) Total Comprehensive Income $ 86,110 $ 60,826 $ 167,451 $ 106,493
Components of Accumulated Other Comprehensive Income	The components of accumulated other comprehensive income for the six months ended June 30, 2019 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2019 Unrealized Accretion on Defined Items Total Balance at January 1, 2019 ($ 18,289 ) ($ 50 ) ($ 36,680 ) ($ 57,019 ) Reclass due to adopting Accounting Standard Update 2017-12 0 50 0 50 Other comprehensive income before reclassification 33,272 0 0 33,272 Amounts reclassified from accumulated other comprehensive income 1,511 0 1,819 3,330 Net current-period other comprehensive income, net of tax 34,783 0 1,819 36,602 Balance at June 30, 2019 $ 16,494 $ 0 ($ 36,861 ) ($ 20,367 ) (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, 2019 Details about AOCI Components Amount Affected Line Item in the Statement Where Net Income is Presented Available for sale (“AFS”) securities: Reclassification of previous noncredit OTTI to credit OTTI $ 2,188 Net investment securities (losses) gains Net reclassification adjustment for losses (gains) included in net income (218 ) Net investment securities (losses) gains 1,970 Total before tax Related income tax effect (459 ) Tax expense 1,511 Net of tax Pension plan: Recognized net actuarial loss 2,355 (a) 2,355 Total before tax Related income tax effect (536 ) Tax expense 1,819 Net of tax Total reclassifications for the period $ 3,330 (a) This AOCI component is included in the net periodic pension cost (see Note 14, Employee Benefit Plans)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2019
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 2019 2018 2019 2018 Distributed earnings allocated to common stock $ 34,604 $ 35,516 $ 69,276 $ 71,195 Undistributed earnings allocated to common stock 32,446 30,637 61,276 56,557 Net earnings allocated to common shareholders $ 67,050 $ 66,153 $ 130,552 $ 127,752 Average common shares outstanding 101,773,643 104,682,910 101,833,880 104,770,681 Equivalents from stock options 274,202 269,878 265,929 287,333 Average diluted shares outstanding 102,047,845 104,952,788 102,099,809 105,058,014 Earnings per basic common share $ 0.66 $ 0.63 $ 1.28 $ 1.22 Earnings per diluted common share $ 0.66 $ 0.63 $ 1.28 $ 1.22

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2019
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 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 LIBOR + 2.85% January 23, 2034 United Statutory Trust V July 12, 2007 $ 50,000 3-month LIBOR + 1.55% October 1, 2037 United Statutory Trust VI September 20, 2007 $ 30,000 3-month LIBOR + 1.30% 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 LIBOR + 1.74% June 15, 2035 Premier Statutory Trust IV June 20, 2006 $ 14,000 3-month LIBOR + 1.55% September 23, 2036 Premier Statutory Trust V December 14, 2006 $ 10,000 3-month LIBOR + 1.61% March 1, 2037 Centra Statutory Trust I September 20, 2004 $ 10,000 3-month LIBOR + 2.29% September 20, 2034 Centra Statutory Trust II June 15, 2006 $ 10,000 3-month LIBOR + 1.65% July 7, 2036 Virginia Commerce Trust II December 19, 2002 $ 15,000 6-month LIBOR + 3.30% December 19, 2032 Virginia Commerce Trust III December 20, 2005 $ 25,000 3-month LIBOR + 1.42% February 23, 2036 Cardinal Statutory Trust I July 27, 2004 $ 20,000 3-month LIBOR + 2.40% September 15, 2034 UFBC Capital Trust I December 30, 2004 $ 5,000 3-month LIBOR + 2.10% March 15, 2035
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, 2019 As of December 31, 2018 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 257,888 $ 248,746 $ 9,142 $ 257,754 $ 248,741 $ 9,013 (1) Represents investment in VIEs.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2019
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, 2019 and 2018 is as follows: At and For the Three Months Ended June 30, 2019 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 152,517 $ 111 $ (3,209 ) $ 1,134 $ 150,553 Provision for loans losses 5,417 0 0 0 5,417 Other income 18,398 23,501 53 (2,157 ) 39,795 Other expense 82,304 18,771 143 (1,023 ) 100,195 Income taxes 17,207 1,004 (682 ) 0 17,529 Net income (loss) $ 65,987 $ 3,837 $ (2,617 ) $ 0 $ 67,207 Total assets (liabilities) $ 19,735,901 $ 442,188 $ 16,729 $ (312,279 ) $ 19,882,539 Average assets (liabilities) 19,447,629 326,525 5,387 (263,687 ) 19,515,854 At and For the Three Months Ended June 30, 2018 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 149,448 $ 264 $ (3,032 ) $ 2,442 $ 149,122 Provision for loans losses 6,204 0 0 0 6,204 Other income 17,465 23,468 68 (4,994 ) 36,007 Other expense 76,495 21,225 (1,758 ) (2,552 ) 93,410 Income taxes 18,948 564 (271 ) 0 19,241 Net income (loss) $ 65,266 $ 1,943 $ (935 ) $ 0 $ 66,274 Total assets (liabilities) $ 19,112,133 $ 388,292 $ 10,895 $ (303,717 ) $ 19,207,603 Average assets (liabilities) 18,658,168 335,781 6,776 (288,341 ) 18,712,384 At and For the Six Months Ended June 30, 2019 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 298,407 $ 166 $ (6,532 ) $ 2,680 $ 294,721 Provision for loans losses 10,413 0 0 0 10,413 Other income 36,050 39,607 255 (4,894 ) 71,018 Other expense 158,298 33,613 (77 ) (2,214 ) 189,620 Income taxes 34,873 1,286 (1,302 ) 0 34,857 Net income (loss) $ 130,873 $ 4,874 $ (4,898 ) $ 0 $ 130,849 Total assets (liabilities) $ 19,735,901 $ 442,188 $ 16,729 $ (312,279 ) $ 19,882,539 Average assets (liabilities) 19,324,956 296,008 1,824 (239,281 ) 19,383,507 At and For the Six Months Ended June 30, 2018 Community Mortgage Other Intersegment Eliminations Consolidated Net interest income $ 295,070 $ 640 $ (5,626 ) $ 3,081 $ 293,165 Provision for loans losses 11,382 0 0 0 11,382 Other income 35,235 38,351 (754 ) (5,633 ) 67,199 Other expense 148,986 39,609 (2,181 ) (2,552 ) 183,862 Income taxes 38,224 (139 ) (945 ) 0 37,140 Net income (loss) $ 131,713 $ (479 ) $ (3,254 ) $ 0 $ 127,980 Total assets (liabilities) $ 19,112,133 $ 388,292 $ 10,895 $ (303,717 ) $ 19,207,603 Average assets (liabilities) 18,583,975 274,211 9,231 (238,796 ) 18,628,621

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 01, 2019	Aug. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Held-to-maturity securities, transferred security, at carrying value			$ 11,544	$ 0
Accounting Standards Update 2017-12 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Held-to-maturity securities, transferred security, at carrying value		$ 11,544
Decrease in AOCI due to transfer of held to maturity securities		$ 1,098
Accounting Standards Update 2018-10 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net lease assets	$ 67,040
Net lease liabilities	70,692
Effect on retained earnings	$ 1,049

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Amortized Cost	$ 2,324,286	$ 2,360,884
Gross Unrealized Gains	29,816	5,865
Gross Unrealized Losses	8,311	29,710
Estimated Fair Value	2,345,791	2,337,039
Cumulative OTTI in AOCI	484	2,672
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	73,369	86,285
Gross Unrealized Gains	1,116	35
Gross Unrealized Losses	1	430
Estimated Fair Value	74,484	85,890
Cumulative OTTI in AOCI	0	0
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Amortized Cost	178,833	212,670
Gross Unrealized Gains	2,968	439
Gross Unrealized Losses	542	4,121
Estimated Fair Value	181,259	208,988
Cumulative OTTI in AOCI	0	0
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	866,597	1,047,345
Gross Unrealized Gains	12,539	3,235
Gross Unrealized Losses	1,569	14,930
Estimated Fair Value	877,567	1,035,650
Cumulative OTTI in AOCI	0	0
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	3,598	3,927
Gross Unrealized Gains	380	332
Gross Unrealized Losses	0	0
Estimated Fair Value	3,978	4,259
Cumulative OTTI in AOCI	86	86
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	566,366	560,634
Gross Unrealized Gains	8,738	996
Gross Unrealized Losses	383	7,030
Estimated Fair Value	574,721	554,600
Cumulative OTTI in AOCI	0	0
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	272,423	272,459
Gross Unrealized Gains	0	450
Gross Unrealized Losses	3,569	939
Estimated Fair Value	268,854	271,970
Cumulative OTTI in AOCI	0	0
Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	6,136	6,176
Gross Unrealized Gains	0	91
Gross Unrealized Losses	723	350
Estimated Fair Value	5,413	5,917
Cumulative OTTI in AOCI	398	2,586
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	18,180	8,754
Gross Unrealized Gains	175	169
Gross Unrealized Losses	1,511	561
Estimated Fair Value	16,844	8,362
Cumulative OTTI in AOCI	0	0
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost	338,784	162,634
Gross Unrealized Gains	3,900	118
Gross Unrealized Losses	13	1,349
Estimated Fair Value	342,671	161,403
Cumulative OTTI in AOCI	$ 0	$ 0

Investment Securities - Summa_2

Investment Securities - Summary of Securities Available for Sale in an Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 327,321	$ 703,081
Less than 12 months, Unrealized Losses	3,537	5,687
12 months or longer, Fair Value	370,938	918,073
12 months or longer, Unrealized Losses	4,774	24,023
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	66,072
Less than 12 months, Unrealized Losses	0	250
12 months or longer, Fair Value	2,621	7,374
12 months or longer, Unrealized Losses	1	180
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	1,127	53,421
Less than 12 months, Unrealized Losses	6	544
12 months or longer, Fair Value	50,689	94,337
12 months or longer, Unrealized Losses	536	3,577
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	9,460	195,009
Less than 12 months, Unrealized Losses	9	1,597
12 months or longer, Fair Value	180,352	508,041
12 months or longer, Unrealized Losses	1,560	13,333
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Losses	0	0
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	42,489	107,443
Less than 12 months, Unrealized Losses	47	1,124
12 months or longer, Fair Value	110,943	294,129
12 months or longer, Unrealized Losses	336	5,906
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	261,566	151,427
Less than 12 months, Unrealized Losses	3,462	939
12 months or longer, Fair Value	7,288	0
12 months or longer, Unrealized Losses	107	0
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	5,412	2,150
12 months or longer, Unrealized Losses	723	350
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	13,633	5,163
12 months or longer, Unrealized Losses	1,511	561
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	12,679	129,709
Less than 12 months, Unrealized Losses	13	1,233
12 months or longer, Fair Value	0	6,879
12 months or longer, Unrealized Losses	$ 0	$ 116

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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales and calls	$ 188,432	$ 75,157	$ 384,763	$ 174,860
Gross realized gains	739	58	754	1,221
Gross realized losses	$ 608	$ 85	$ 972	$ 1,397

Investment Securities - Additio

Investment Securities - Additional Information (Detail) $ in Thousands	3 Months Ended
	Jun. 30, 2019USD ($)Securities	Dec. 31, 2018USD ($)
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 8,311	$ 29,710
Available for sale securities in unrealized loss position | Securities	245
Available for sale securities in portfolio, number | Securities	791
Amortized cost of available for sale securities	$ 2,324,286	2,360,884
Capitalization of banks, equal to or greater than, in the single-issue trust preferred portfolio	10,000,000
Equity securities at estimated fair value	9,098	9,734
Carrying value of securities pledged	$ 1,588,440	1,887,176
Percentage Of Guarantee Repayment By Government	97.00%
Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	$ 4,036
Below Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	2,480
Split Rated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	5,935
Unrated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	5,729
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	542	4,121
Amortized cost of available for sale securities	$ 178,833	212,670
Percent of portfolio with credit support	77.00%
Agency Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	$ 1,432,963
Commercial Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	383	7,030
Amortized cost of available for sale securities	566,366	560,634
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	1,569	14,930
Amortized cost of available for sale securities	866,597	1,047,345
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	0	0
Amortized cost of available for sale securities	3,598	3,927
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings	21
Residential Mortgage-Backed Securities, Non-agency [Member] | Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	8
Residential Mortgage-Backed Securities, Non-agency [Member] | Below Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	3,590
Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	723	350
Amortized cost of available for sale securities	6,136	6,176
Trust Preferred Collateralized Debt Obligations [Member] | TrupCdos [Member]
Schedule of Investments [Line Items]
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings	54
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	13	1,349
Amortized cost of available for sale securities	$ 338,784	$ 162,634
Corporate Bonds [Member] | Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	94.00%
Corporate Bonds [Member] | Unrated Bonds Investment Grade [Member]
Schedule of Investments [Line Items]
Percent of corporate securities portfolio	6.00%

Investment Securities - Roll Fo

Investment Securities - Roll Forward of Credit Losses on Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Cumulative credit losses, Beginning Balance	$ 3,138	$ 3,199	$ 3,138	$ 18,060
Additional credit losses on securities for which OTTI was previously recognized	54	0	54	0
Reductions for securities sold or paid off during the period	0	0	0	(14,861)
Cumulative credit losses, Ending Balance	$ 3,192	$ 3,199	$ 3,192	$ 3,199

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, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 150,318	$ 77,534
Due after one year through five years, Amortized Cost	560,933	518,975
Due after five years through ten years, Amortized Cost	519,370	483,567
Due after ten years, Amortized Cost	1,093,665	1,280,808
Amortized Cost	2,324,286	2,360,884
Due in one year or less, Estimated Fair Value	150,304	77,266
Due after one year through five years, Estimated Fair Value	567,674	514,734
Due after five years through ten years, Estimated Fair Value	527,238	477,135
Due after ten years, Estimated Fair Value	1,100,575	1,267,904
Total available for sale securities	$ 2,345,791	$ 2,337,039

Investment Securities - Summa_5

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Amortized Cost	$ 6,461	$ 19,999
Gross Unrealized Gains	22	99
Gross Unrealized Losses	0	1,443
Estimated Fair Value	6,483	18,655
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	5,015	5,074
Gross Unrealized Gains	21	90
Gross Unrealized Losses	0	0
Estimated Fair Value	5,036	5,164
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,426	5,473
Gross Unrealized Gains	1	7
Gross Unrealized Losses	0	1
Estimated Fair Value	1,427	5,479
Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0	20
Gross Unrealized Gains	0	2
Gross Unrealized Losses	0	0
Estimated Fair Value	0	22
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0	9,412
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	1,442
Estimated Fair Value	0	7,970
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost	20	20
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 20	$ 20

Investment Securities - Summa_6

Investment Securities - Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 5,225	$ 7,913
Due after one year through five years, Amortized Cost	216	1,059
Due after five years through ten years, Amortized Cost	0	8,030
Due after ten years, Amortized Cost	1,020	2,997
Amortized Cost	6,461	19,999
Due in one year or less, Estimated Fair Value	5,246	8,005
Due after one year through five years, Estimated Fair Value	217	1,061
Due after five years through ten year, Estimated Fair Value	0	7,134
Due after ten years, Estimated Fair Value	1,020	2,455
Estimated Fair Value, Total	$ 6,483	$ 18,655

Investment Securities - Summa_7

Investment Securities - Summary of Equity Securities (Detail) - Marketable Equity Securities [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items]
Net losses recognized during the period	$ 55	$ (28)	$ 244	$ (64)
Net losses recognized during the period on equity securities sold	2	(4)	134	(2)
Unrealized gains recognized during the period on equity securities still held at period end	64	11	122	50
Unrealized losses recognized during the period on equity securities still held at period end	$ 11	$ 35	$ 12	$ 112

Loans - Major Classes of Loans

Loans - Major Classes of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Commercial, financial, and agricultural
Total commercial, financial & agricultural	$ 7,455,971	$ 7,553,044
Residential real estate	3,674,005	3,501,393
Construction & land development	1,464,064	1,410,468
Consumer:
Bankcard	9,380	10,203
Other consumer	1,036,526	954,424
Total Financing Receivables	13,639,946	13,429,532
Owner-Occupied Commercial Real Estate [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	1,239,954	1,291,790
Nonowner-Occupied Commercial Real Estate [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	4,194,064	4,303,613
Other Commercial Loans [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	$ 2,021,953	$ 1,957,641

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Loans held for sale	$ 370,593	$ 249,846
Acquired impaired loans from merger	$ 13,639,946	$ 13,429,532
Percentage of acquired impaired loans from merger on total gross loans	0.82%	1.12%
Recorded investment in acquired impaired loans	$ 144,127	$ 195,706
Directors and Officers [Member]
Related party loans	85,506	93,282
Loans Acquired with Deteriorated Credit Quality [Member]
Acquired impaired loans from merger	$ 111,611	$ 149,737

Loans - Activity for Accretable

Loans - Activity for Accretable Yield (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield at the beginning of the period	$ 26,289
Accretion (including cash recoveries)	(5,850)
Additions	0
Net reclassifications to accretable from non-accretable	7,051
Disposals (including maturities, foreclosures, and charge-offs)	(4,335)
Accretable yield at the end of the period	$ 23,155

Credit Quality - Additional Inf

Credit Quality - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
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			$ 58,750		$ 59,425
Restructured loans on nonaccrual status	$ 48,586		48,586		48,899
Restructured loans modified by reduction in interest	1,801		1,801
Restructured loan and interest	1,796		1,796
Restructured loans modified by change in terms	55,153		$ 55,153
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	14,469		$ 14,469		16,865
Recorded investment of consumer mortgage loans	288		288		520
Restructured Loans Modified By Reduction InInterest Rate Amount During Period	4,743	$ 16,524	251	$ 16,524
Restructured Loans Modified By Change In Terms Amount During Period	5,146		5,146
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Restructured loans on nonaccrual status	$ 1,278		$ 1,278		$ 690

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, 2019USD ($)Contract	Jun. 30, 2018USD ($)Contract	Jun. 30, 2019USD ($)Contract	Jun. 30, 2018USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	7	6	9	6
Pre-Modification Outstanding Recorded Investment	$ 4,796	$ 16,524	$ 5,474	$ 16,524
Post-Modification Outstanding Recorded Investment	$ 4,743	$ 16,524	$ 5,397	$ 16,524
Construction & Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	0	3	0
Pre-Modification Outstanding Recorded Investment	$ 2,242	$ 0	$ 2,242	$ 0
Post-Modification Outstanding Recorded Investment	$ 2,202	$ 0	$ 2,202	$ 0
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 150	$ 0	$ 150	$ 0
Post-Modification Outstanding Recorded Investment	$ 150	$ 0	$ 150	$ 0
Commercial Real Estate [Member] | Nonowner-Occupied [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
Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	4	2	4
Pre-Modification Outstanding Recorded Investment	$ 559	$ 9,571	$ 824	$ 9,571
Post-Modification Outstanding Recorded Investment	$ 559	$ 9,571	$ 811	$ 9,571
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	2	3	2
Pre-Modification Outstanding Recorded Investment	$ 1,845	$ 6,953	$ 2,258	$ 6,953
Post-Modification Outstanding Recorded Investment	$ 1,832	$ 6,953	$ 2,234	$ 6,953
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	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0

Credit Quality - Schedule of Ch

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

Credit Quality - Schedule of Ag

Credit Quality - Schedule of Age Analysis of its Past Due Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	$ 74,929	$ 94,027
Loans, Total Past Due	207,367	227,011
Loans, Current & Other	13,432,579	13,202,521
Total Financing Receivables	13,639,946	13,429,532
Loans, Recorded Investment >90 Days & Accruing	12,729	15,541
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	132,438	132,984
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	4,233	8,462
Loans, Total Past Due	21,316	27,874
Loans, Current & Other	1,442,748	1,382,594
Total Financing Receivables	1,464,064	1,410,468
Loans, Recorded Investment >90 Days & Accruing	495	680
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	17,083	19,412
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	11,074	9,224
Loans, Total Past Due	28,677	26,966
Loans, Current & Other	1,211,277	1,264,824
Total Financing Receivables	1,239,954	1,291,790
Loans, Recorded Investment >90 Days & Accruing	1,136	629
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	17,603	17,742
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	7,572	16,108
Loans, Total Past Due	27,250	34,200
Loans, Current & Other	4,166,814	4,269,413
Total Financing Receivables	4,194,064	4,303,613
Loans, Recorded Investment >90 Days & Accruing	2,713	1,171
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	19,678	18,092
Other Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	10,075	13,556
Loans, Total Past Due	54,918	59,596
Loans, Current & Other	1,967,035	1,898,045
Total Financing Receivables	2,021,953	1,957,641
Loans, Recorded Investment >90 Days & Accruing	745	2,850
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	44,843	46,040
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	33,514	37,111
Loans, Total Past Due	65,932	67,389
Loans, Current & Other	3,608,073	3,434,004
Total Financing Receivables	3,674,005	3,501,393
Loans, Recorded Investment >90 Days & Accruing	7,069	9,141
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	32,418	30,278
Consumer [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	450	657
Loans, Total Past Due	579	834
Loans, Current & Other	8,801	9,369
Total Financing Receivables	9,380	10,203
Loans, Recorded Investment >90 Days & Accruing	129	177
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	129	177
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	8,011	8,909
Loans, Total Past Due	8,695	10,152
Loans, Current & Other	1,027,831	944,272
Total Financing Receivables	1,036,526	954,424
Loans, Recorded Investment >90 Days & Accruing	442	893
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	$ 684	$ 1,243

Credit Quality - Schedule of _2

Credit Quality - Schedule of Age Analysis of its Past Due Loans, Segregated by Class of Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	$ 13,639,946	$ 13,429,532
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	111,611	149,737
Loans Acquired with Deteriorated Credit Quality [Member] | Loans and Debt Securities Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	$ 111,611	$ 149,737

Credit Quality - Schedule of No

Credit Quality - Schedule of Nonaccrual Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	$ 119,709	$ 117,443
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	16,588	18,732
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	16,467	17,113
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	16,965	16,921
Other Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	44,098	43,190
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	25,349	21,137
Consumer [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	0	0
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	$ 242	$ 350

Credit Quality - Schedule of Cr

Credit Quality - Schedule of Credit Quality Indicators Information, by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	$ 13,639,946	$ 13,429,532
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	3,674,005	3,501,393
Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,021,953	1,957,641
Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	9,380	10,203
Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,036,526	954,424
Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,239,954	1,291,790
Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	4,194,064	4,303,613
Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,464,064	1,410,468
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	3,611,502	3,436,584
Pass [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,892,676	1,858,821
Pass [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	8,801	9,369
Pass [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,027,772	944,241
Pass [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,146,018	1,201,387
Pass [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	4,080,814	4,161,149
Pass [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,377,072	1,330,899
Special Mention [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	15,833	19,051
Special Mention [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	55,345	14,424
Special Mention [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	450	657
Special Mention [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	8,015	8,914
Special Mention [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	33,082	34,487
Special Mention [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	37,946	46,442
Special Mention [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	11,038	28,629
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	46,670	45,758
Substandard [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	73,497	81,946
Substandard [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	129	177
Substandard [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	739	1,269
Substandard [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	60,854	55,916
Substandard [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	75,304	96,022
Substandard [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	75,954	50,940
Doubtful [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0	0
Doubtful [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	435	2,450
Doubtful [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0	0
Doubtful [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0	0
Doubtful [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0	0
Doubtful [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0	0
Doubtful [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	$ 0	$ 0

Credit Quality - Schedule of Im

Credit Quality - Schedule of Impaired Loans Information by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Construction & Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	$ 36,868		$ 36,868		$ 37,174
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	43,318		43,318		40,459
Impaired Loans, Recorded Investment, With an allowance recorded	14,085		14,085		14,742
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	16,135		16,135		19,446
Impaired Loans, Related Allowance	1,954		1,954		2,254
Impaired Loans, Recorded Investment	50,953		50,953		51,916
Impaired Loans, Unpaid Principal Balance	59,453		59,453		59,905
Impaired Loans, Related Allowance	1,954		1,954		2,254
Impaired Loans, Average Recorded Investment, With no related allowance recorded	36,654	$ 46,909	36,828	$ 48,699
Impaired Loans, Interest Income Recognized, With no related allowance recorded	199	98	417	197
Impaired Loans, Average Recorded Investment, With an allowance recorded	14,413	2,008	14,522	1,800
Impaired Loans, Interest Income Recognized, With an allowance recorded	20	20	40	40
Impaired Loans, Average Recorded Investment	51,067	48,917	51,350	50,499
Impaired Loans, Interest Income Recognized	219	118	457	237
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	71,948		71,948		63,633
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	73,267		73,267		63,798
Impaired Loans, Recorded Investment, With an allowance recorded	4,942		4,942		10,004
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	4,942		4,942		10,004
Impaired Loans, Related Allowance	1,390		1,390		2,542
Impaired Loans, Recorded Investment	76,890		76,890		73,637
Impaired Loans, Unpaid Principal Balance	78,209		78,209		73,802
Impaired Loans, Related Allowance	1,390		1,390		2,542
Impaired Loans, Average Recorded Investment, With no related allowance recorded	70,051	74,330	67,911	75,592
Impaired Loans, Interest Income Recognized, With no related allowance recorded	467	354	911	739
Impaired Loans, Average Recorded Investment, With an allowance recorded	5,212	5,319	6,809	6,590
Impaired Loans, Interest Income Recognized, With an allowance recorded	0	6	0	31
Impaired Loans, Average Recorded Investment	75,263	79,649	74,720	82,182
Impaired Loans, Interest Income Recognized	467	360	911	770
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	50,228		50,228		98,845
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	50,294		50,294		98,904
Impaired Loans, Recorded Investment, With an allowance recorded	10,371		10,371		15,720
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	10,371		10,371		15,720
Impaired Loans, Related Allowance	1,524		1,524		2,715
Impaired Loans, Recorded Investment	60,599		60,599		114,565
Impaired Loans, Unpaid Principal Balance	60,665		60,665		114,624
Impaired Loans, Related Allowance	1,524		1,524		2,715
Impaired Loans, Average Recorded Investment, With no related allowance recorded	68,371	108,343	78,529	116,941
Impaired Loans, Interest Income Recognized, With no related allowance recorded	354	159	708	328
Impaired Loans, Average Recorded Investment, With an allowance recorded	12,210	9,503	13,380	8,934
Impaired Loans, Interest Income Recognized, With an allowance recorded	39	60	84	119
Impaired Loans, Average Recorded Investment	80,581	117,846	91,909	125,875
Impaired Loans, Interest Income Recognized	393	219	792	447
Other Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	63,121		63,121		40,291
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	68,326		68,326		50,459
Impaired Loans, Recorded Investment, With an allowance recorded	35,166		35,166		61,266
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	37,403		37,403		62,812
Impaired Loans, Related Allowance	7,805		7,805		17,581
Impaired Loans, Recorded Investment	98,287		98,287		101,557
Impaired Loans, Unpaid Principal Balance	105,729		105,729		113,271
Impaired Loans, Related Allowance	7,805		7,805		17,581
Impaired Loans, Average Recorded Investment, With no related allowance recorded	52,659	52,384	48,536	50,587
Impaired Loans, Interest Income Recognized, With no related allowance recorded	327	246	614	470
Impaired Loans, Average Recorded Investment, With an allowance recorded	41,641	46,376	48,183	51,088
Impaired Loans, Interest Income Recognized, With an allowance recorded	9	10	49	28
Impaired Loans, Average Recorded Investment	94,300	98,760	96,719	101,675
Impaired Loans, Interest Income Recognized	336	256	663	498
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	34,972		34,972		28,207
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	35,174		35,174		29,279
Impaired Loans, Recorded Investment, With an allowance recorded	12,013		12,013		19,623
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	13,618		13,618		22,064
Impaired Loans, Related Allowance	1,390		1,390		3,265
Impaired Loans, Recorded Investment	46,985		46,985		47,830
Impaired Loans, Unpaid Principal Balance	48,792		48,792		51,343
Impaired Loans, Related Allowance	1,390		1,390		3,265
Impaired Loans, Average Recorded Investment, With no related allowance recorded	32,287	24,220	30,927	25,064
Impaired Loans, Interest Income Recognized, With no related allowance recorded	158	85	342	180
Impaired Loans, Average Recorded Investment, With an allowance recorded	14,451	11,992	16,175	11,266
Impaired Loans, Interest Income Recognized, With an allowance recorded	48	11	140	21
Impaired Loans, Average Recorded Investment	46,738	36,212	47,102	36,330
Impaired Loans, Interest Income Recognized	206	96	482	201
Consumer [Member] | Bankcard [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	0		0		0
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	0		0		0
Impaired Loans, Recorded Investment, With an allowance recorded	0		0		0
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	0		0		0
Impaired Loans, Related Allowance	0		0		0
Impaired Loans, Recorded Investment	0		0		0
Impaired Loans, Unpaid Principal Balance	0		0		0
Impaired Loans, Related Allowance	0		0		0
Impaired Loans, Average Recorded Investment, With no related allowance recorded	0	0	0	0
Impaired Loans, Interest Income Recognized, With no related allowance recorded	0	0	0	0
Impaired Loans, Average Recorded Investment, With an allowance recorded	0	0	0	0
Impaired Loans, Interest Income Recognized, With an allowance recorded	0	0	0	0
Impaired Loans, Average Recorded Investment	0	0	0	0
Impaired Loans, Interest Income Recognized	0	0	0	0
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	31		31		27
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	31		31		27
Impaired Loans, Recorded Investment, With an allowance recorded	0		0		0
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	0		0		0
Impaired Loans, Related Allowance	0		0		0
Impaired Loans, Recorded Investment	31		31		27
Impaired Loans, Unpaid Principal Balance	31		31		27
Impaired Loans, Related Allowance	0		0		$ 0
Impaired Loans, Average Recorded Investment, With no related allowance recorded	29	32	28	26
Impaired Loans, Interest Income Recognized, With no related allowance recorded	0	0	0	0
Impaired Loans, Average Recorded Investment, With an allowance recorded	0	0	0	0
Impaired Loans, Interest Income Recognized, With an allowance recorded	0	0	0	0
Impaired Loans, Average Recorded Investment	29	32	28	26
Impaired Loans, Interest Income Recognized	$ 0	$ 0	$ 0	$ 0

Allowance for Credit Losses - A

Allowance for Credit Losses - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Specific loss allocations are calculated for commercial loans in excess			$ 500,000
Number of days for collecting principal or interest on consumer loans			90 days
Minimum collection period for home equity loan or high loan to value loan			180 days
Retail credits amount deemed unrecoverable charged-off period			60 days
Retail credits charged off period after discovery of the fraud			90 days
provision for loan losses related to loans acquired	$ 1,631,000	$ 801,000	$ 3,268,000	$ 2,080,000
Reserve for lending-related commitments	$ 1,752,000		$ 1,752,000		$ 1,389,000
Closed-End Retail Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of days delinquent from contractual due date			120 days
Open-End Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Number of days delinquent from contractual due date			180 days

Allowance for Credit Losses - S

Allowance for Credit Losses - Schedule of Allowance for Loan Losses and Carrying Amount of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	$ 76,886	$ 76,703	$ 76,627
Charge-offs	7,588	14,002	28,606
Recoveries	1,685	3,286	6,669
Provision	5,417	10,413	22,013
Allowance for Loan Losses Ending balance	76,400	76,400	76,703
Allowance for Loan Losses, individually evaluated for impairment	14,063	14,063	28,358
Allowance for Loan Losses, collectively evaluated for impairment	62,337	62,337	48,345
Financing receivables	13,639,946	13,639,946	13,429,532
Financing receivables, individually evaluated for impairment	146,342	146,342	161,935
Financing receivables, collectively evaluated for impairment	13,381,993	13,381,993	13,117,860
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0	0	0
Financing receivables	111,611	111,611	149,737
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	7,186	7,992	7,187
Charge-offs	8	573	2,731
Recoveries	39	152	197
Provision	(292)	(646)	3,339
Allowance for Loan Losses Ending balance	6,925	6,925	7,992
Allowance for Loan Losses, individually evaluated for impairment	1,954	1,954	2,254
Allowance for Loan Losses, collectively evaluated for impairment	4,971	4,971	5,738
Financing receivables	1,464,064	1,464,064	1,410,468
Financing receivables, individually evaluated for impairment	14,085	14,085	14,807
Financing receivables, collectively evaluated for impairment	1,429,245	1,429,245	1,374,840
Construction & Land Development [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0	0	0
Financing receivables	20,734	20,734	20,821
Allowance for Estimated Imprecision [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	384	245	73
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(151)	(12)	172
Allowance for Loan Losses Ending balance	233	233	245
Allowance for Loan Losses, individually evaluated for impairment	0	0	0
Allowance for Loan Losses, collectively evaluated for impairment	233	233	245
Financing receivables	0	0	0
Financing receivables, individually evaluated for impairment	0	0	0
Financing receivables, collectively evaluated for impairment	0	0	0
Allowance for Estimated Imprecision [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0	0	0
Financing receivables	0	0	0
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	6,164	5,063	5,401
Charge-offs	2,784	6,521	3,225
Recoveries	714	1,618	1,189
Provision	1,503	5,437	1,698
Allowance for Loan Losses Ending balance	5,597	5,597	5,063
Allowance for Loan Losses, individually evaluated for impairment	1,390	1,390	2,543
Allowance for Loan Losses, collectively evaluated for impairment	4,207	4,207	2,520
Financing receivables	1,239,954	1,239,954	1,291,790
Financing receivables, individually evaluated for impairment	27,882	27,882	27,599
Financing receivables, collectively evaluated for impairment	1,185,613	1,185,613	1,234,919
Commercial Real Estate [Member] | Owner-Occupied [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0	0	0
Financing receivables	26,459	26,459	29,272
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	6,718	6,919	6,369
Charge-offs	69	69	314
Recoveries	22	41	563
Provision	(630)	(850)	301
Allowance for Loan Losses Ending balance	6,041	6,041	6,919
Allowance for Loan Losses, individually evaluated for impairment	1,524	1,524	2,715
Allowance for Loan Losses, collectively evaluated for impairment	4,517	4,517	4,204
Financing receivables	4,194,064	4,194,064	4,303,613
Financing receivables, individually evaluated for impairment	29,559	29,559	25,231
Financing receivables, collectively evaluated for impairment	4,147,831	4,147,831	4,215,060
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0	0	0
Financing receivables	16,674	16,674	63,322
Other Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	40,664	41,341	45,189
Charge-offs	3,645	4,579	16,424
Recoveries	420	717	2,944
Provision	7,270	7,230	9,632
Allowance for Loan Losses Ending balance	44,709	44,709	41,341
Allowance for Loan Losses, individually evaluated for impairment	7,805	7,805	17,581
Allowance for Loan Losses, collectively evaluated for impairment	36,904	36,904	23,760
Financing receivables	2,021,953	2,021,953	1,957,641
Financing receivables, individually evaluated for impairment	54,549	54,549	72,300
Financing receivables, collectively evaluated for impairment	1,930,570	1,930,570	1,860,085
Other Commercial [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0	0	0
Financing receivables	36,834	36,834	25,256
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	13,022	12,448	9,927
Charge-offs	309	750	3,162
Recoveries	269	354	1,114
Provision	(2,810)	(1,880)	4,569
Allowance for Loan Losses Ending balance	10,172	10,172	12,448
Allowance for Loan Losses, individually evaluated for impairment	1,390	1,390	3,265
Allowance for Loan Losses, collectively evaluated for impairment	8,782	8,782	9,183
Financing receivables	3,674,005	3,674,005	3,501,393
Financing receivables, individually evaluated for impairment	20,267	20,267	21,998
Financing receivables, collectively evaluated for impairment	3,642,859	3,642,859	3,468,356
Residential Real Estate [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0	0	0
Financing receivables	10,879	10,879	11,039
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	2,748	2,695	2,481
Charge-offs	773	1,510	2,750
Recoveries	221	404	662
Provision	527	1,134	2,302
Allowance for Loan Losses Ending balance	2,723	2,723	2,695
Allowance for Loan Losses, individually evaluated for impairment	0	0	0
Allowance for Loan Losses, collectively evaluated for impairment	2,723	2,723	2,695
Financing receivables	1,045,906	1,045,906	964,627
Financing receivables, individually evaluated for impairment	0	0	0
Financing receivables, collectively evaluated for impairment	1,045,906	1,045,906	964,600
Consumer [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0	0	0
Financing receivables	$ 31	$ 31	$ 27

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill not subject to amortization	$ 1,478,014	$ 1,478,014
Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	98,359	98,359
Accumulated Amortization	(66,000)	(62,492)
George Mason Trade Name Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,080	1,080
Community Banking [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill not subject to amortization	1,472,699	1,472,699
Community Banking [Member] | Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	98,359	98,359
Accumulated Amortization	(66,000)	(62,492)
Community Banking [Member] | George Mason Trade Name Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	0
Mortgage Banking [Member]
Finite-Lived Intangible Assets [Line Items]
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

Intangible Assets - Reconciliat

Intangible Assets - Reconciliation of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Goodwill [Line Items]
Goodwill at December 31, 2018	$ 1,478,014
Addition to goodwill	0
Goodwill at March 31, 2019	1,478,014
Community Banking [Member]
Goodwill [Line Items]
Goodwill at December 31, 2018	1,472,699
Addition to goodwill	0
Goodwill at March 31, 2019	1,472,699
Mortgage Banking [Member]
Goodwill [Line Items]
Goodwill at December 31, 2018	5,315
Addition to goodwill	0
Goodwill at March 31, 2019	$ 5,315

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Amortization Expense On Intangible Assets	$ 1,754	$ 2,010	$ 3,508	$ 4,020

Intangible Assets - Schedule of

Intangible Assets - Schedule of Anticipated Amortization Expense (Detail) $ in Thousands	Jun. 30, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2019	$ 7,016
2020	6,309
2021	5,369
2022	4,581
2023 and thereafter	$ 12,592

Leases - Additional Information

Leases - Additional Information (Detail)	Jun. 30, 2019
Operating lease remaining lease term	5 years
Operating leases, option to extend term	0 days
Maximum [Member]
Operating lease remaining lease term	0 days

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Jun. 30, 2019
Operating lease cost	$ 4,886	$ 9,707
Sublease income	(197)	(473)
Net lease cost	$ 4,689	$ 9,234

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating lease right-of-use assets	$ 63,113	$ 0
Operating lease liabilities	$ 66,821	$ 0

Leases - Other Information Rela

Leases - Other Information Related to Leases (Detail)	Jun. 30, 2019
Weightedaverage remaining lease term [Abstract]
Operating leases	5 years
Weightedaverage discount rate [Abstract]
Operating leases	3.25%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Jun. 30, 2019
Cash paid for amounts in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases	$ 4,931	$ 9,649
ROU assets obtained in the exchange for lease liabilities	$ 4,214	$ 4,416

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities by Year (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
2019	$ 9,618	$ 18,590
2020	17,249	16,359
2021	14,672	13,850
2022	11,008	10,269
2023	8,231	7,600
Thereafter	11,966	10,640
Total lease payments	72,744	77,308
Less: imputed interest	(5,923)	0
Total	$ 66,821	$ 77,308

Short-Term Borrowings - Additio

Short-Term Borrowings - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Short-term Debt [Line Items]
Unused lines of credit	$ 230,000
Federal funds purchased	0	$ 23,400,000
Repurchase agreements	122,159
Unrelated Financial Institution [Member]
Short-term Debt [Line Items]
Unused lines of credit	$ 20,000
Renewal period of line of credit	360-day
Amount of outstanding balance under line of credit	$ 0

Long-Term Borrowings - Addition

Long-Term Borrowings - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Unused borrowing amount	$ 3,905,439
Outstanding balances of debentures	$ 235,535	$ 234,905
Maximum time to defer payment of interest on subordinate debt	5 years
Advances from Federal Home Loan Banks	$ 1,548,032,000	$ 1,439,198,000
Federal Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year	2.22%
Advances From Federal Home Loan Banks Maximum Maturity Period	6 years

Long -Term Borrowings - Schedul

Long -Term Borrowings - Schedule of Maturities of Long-term Borrowings (Detail) $ in Thousands	Jun. 30, 2019USD ($)
Debt Disclosure [Abstract]
2019	$ 471,000
2020	442,000
2021	602,845
2022	21,000
2023 and thereafter	11,187
Total	$ 1,548,032

Commitments and Contingent Li_2

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Loan commitments outstanding	$ 3,909,612	$ 3,826,370
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	$ 946
Commitments to Extend Credit [Member] | George Mason [Member] | Short-term Contract with Customer [Member]
Loss Contingencies [Line Items]
Additional commitments to extend credit	354,996
Commercial Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	5,092	0
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	$ 133,930	$ 141,032

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Notional Amount and Fair Value Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Asset derivatives, notional amount	$ 298,975	$ 201,182
Asset derivatives designated as hedging instruments	0	1,859
Liability derivatives, notional amount	489,696	200,281
Asset derivatives not designated as hedging instruments	8,619	4,645
Total asset derivatives	8,619	6,504
Liability derivatives designated as hedging instruments	2,146	0
Liability derivatives not designated as hedging instruments	3,476	3,002
Total liability derivatives	5,622	3,002
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	0	85,623
Liability derivatives, notional amount	84,397	0
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	298,975	115,559
Liability derivatives, notional amount	405,299	200,281
Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Asset derivatives not designated as hedging instruments	8,127	4,103
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Asset derivatives, notional amount	250,487	93,955
Other Liabilities [Member] | TBA Mortgage Backed Securities [Member]
Derivative [Line Items]
Liability derivatives not designated as hedging instruments	3,476	3,002
Other Liabilities [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Liability derivatives not designated as hedging instruments	0	0
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] | TBA Mortgage Backed Securities [Member]
Derivative [Line Items]
Liability derivatives, notional amount	405,299	200,281
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Liability derivatives, notional amount	0	0
Interest Rate Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	0	0
Asset derivatives not designated as hedging instruments	0	0
Interest Rate Contracts [Member] | Other Assets [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Hedged Commercial Loans [Member]
Derivative [Line Items]
Asset derivatives, notional amount	0	85,623
Asset derivatives designated as hedging instruments	0	1,859
Interest Rate Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability derivatives, notional amount	0	0
Liability derivatives not designated as hedging instruments	0	0
Interest Rate Contracts [Member] | Other Liabilities [Member] | Fair Value Hedging [Member] | Hedged Commercial Loans [Member]
Derivative [Line Items]
Liability derivatives designated as hedging instruments	2,146	0
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	84,397	0
Forward Loan Sale Commitments [Member] | Other Assets [Member]
Derivative [Line Items]
Asset derivatives not designated as hedging instruments	492	542
Forward Loan Sale Commitments [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives, notional amount	$ 48,488	$ 21,604

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of Carrying Amount Hedged Assets/(Liabilities) (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - Loans Net Of Unearned Income [Member]	Jun. 30, 2019USD ($)
Carrying Amount of the Hedged Assets/(Liabilities)	$ 83,527
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)	(2,146)
Cumulative Amount of Fair Value Hedging Adjustment Remaining for any Hedged Assets/(Liabilities) for which Hedge Accounting has been Discontinued	$ 0

Derivative Financial Instrume_5

Derivative Financial Instruments - Schedule of Derivative Financial Instruments on Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative [Line Items]
Derivatives in hedging relationships	$ 3,295	$ 2,364	$ 6,170	$ 676
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivatives in hedging relationships	(68)	24	(98)	(18)
Designated as Hedging Instrument [Member] | Interest Income Expense [Member] | Interest Rate Contracts [Member] | Fair Value Hedging [Member]
Derivative [Line Items]
Derivatives in hedging relationships	(68)	24	(98)	(18)
Designated as Hedging Instrument [Member] | Other Income [Member] | Forward Loan Sale Commitments [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivatives in hedging relationships			0	0
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivatives not designated as hedging instruments	3,363	2,340	6,268	694
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	(962)	(660)	(474)	(1,110)
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	3,833	2,888	5,870	1,619
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	$ 492	$ 112	$ 872	$ 185

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfers from Level 1 to Level 3 for financial assets	$ 0	$ 0
Transfers from Level 3 to Level 1 for financial assets	0	0
Transfers from Level 2 to Level 3 for financial assets	0	0
Transfers from Level 3 to Level 2 for financial assets	0	0
Transfers from Level 1 to Level 3 for financial liabilities	0	0
Transfers from Level 3 to Level 1 for financial liabilities	0	0
Transfers from Level 2 to Level 3 for financial liabilities	0	0
Transfers from Level 3 to Level 2 for financial liabilities	0	0
Nonrecurring fair value adjustments on loans held for sale	0
Fair value measurement of intangible assets	$ 0	$ 0
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	0.16%
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	0.71%
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	0.33%
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	0.16%
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	0.71%
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	0.33%

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale		$ 370,593	$ 249,846
Derivative financial assets		8,619	6,504
Derivative financial liabilities		5,622	3,002
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		2,345,791	2,337,039
Available for sale equity securities		9,098	9,734
Loans held for sale		365,440	247,104
Derivative financial assets		8,619	6,504
Derivative financial liabilities		5,622	3,002
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		74,484	85,890
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		181,259	208,988
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		877,567	1,035,650
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		3,978	4,259
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		574,721	554,600
Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		268,854	271,970
Trust Preferred Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		5,413	5,917
Single Issue Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		16,844	8,362
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		342,671	161,403
Financial Services Industry [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		133	140
Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities		4,756	4,640
Forward Sales Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		492	542
Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		8,127	4,103
TBA Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities		3,476	3,002
Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		0	1,859
Derivative financial liabilities		2,146
Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	[1]	4,209	4,954
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale		0	0
Derivative financial assets		0	0
Derivative financial liabilities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		6,712	6,822
Available for sale equity securities		9,098	9,734
Loans held for sale		0	0
Derivative financial assets		0	0
Derivative financial liabilities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Trust Preferred Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		6,712	6,822
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		133	140
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		4,756	4,640
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Forward Sales Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Lock Commitments [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | TBA Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities		0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | 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
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	[1]	4,209	4,954
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale		5,153	2,742
Derivative financial assets		492	2,401
Derivative financial liabilities		5,622	3,002
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		2,333,666	2,324,300
Available for sale equity securities		0	0
Loans held for sale		0	0
Derivative financial assets		492	2,401
Derivative financial liabilities		5,622	3,002
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		74,484	85,890
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		181,259	208,988
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		877,567	1,035,650
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		3,978	4,259
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		574,721	554,600
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		268,854	271,970
Significant Other Observable Inputs (Level 2) [Member] | Trust Preferred Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Other Observable Inputs (Level 2) [Member] | Single Issue Trust Preferred Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		16,844	8,362
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		335,959	154,581
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		492	542
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		0	0
Significant Other Observable Inputs (Level 2) [Member] | TBA Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities		3,476	3,002
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		0	1,859
Derivative financial liabilities		2,146
Significant Other Observable Inputs (Level 2) [Member] | Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	[1]	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale		365,440	247,104
Derivative financial assets		8,127	4,103
Derivative financial liabilities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		5,413	5,917
Available for sale equity securities		0	0
Loans held for sale		365,440	247,104
Derivative financial assets		8,127	4,103
Derivative financial liabilities		0	0
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | State and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		0	0
Significant Unobservable Inputs (Level 3) [Member] | Trust Preferred Collateralized Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		5,413	5,917
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
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		8,127	4,103
Significant Unobservable Inputs (Level 3) [Member] | TBA Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial liabilities		0	0
Significant Unobservable Inputs (Level 3) [Member] | 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
Significant Unobservable Inputs (Level 3) [Member] | Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	[1]	$ 0	$ 0
[1]	The equity mutual funds are within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries.

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Additional Information about Financial Assets and Liabilities Measured at Fair Value Utilized Level 3 (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	$ 5,917	$ 34,269
Included in earnings (or changes in net assets)	(53)	28
Included in other comprehensive income	(451)	920
Purchases, issuances, and settlements	0	0
Sales	0	(29,300)
Transfers in and/or out of Level 3	0	0
Balance, end of period	5,413	5,917
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	0	0
Loans Held For Sale [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	247,104	263,308
Included in earnings (or changes in net assets)	39,576	68,555
Originations	1,256,514	2,619,454
Sales	(1,177,754)	(2,676,797)
Transfers in and/or out of Level 3	0	(27,416)
Balance, end of period	365,440	247,104
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	0	0
Interest Rate Lock Commitments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	4,103	4,559
Transfers in and/or out of Level 3	4,024	(456)
Balance, end of period	8,127	4,103
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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Mortgage Banking [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Income from mortgage banking activities	$ 4,578	$ 3,929	$ 6,542	$ 3,092

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, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Loans held for sale, unpaid principal balance	$ 357,112	$ 241,293
Loans held for sale, fair value	365,440	247,104
Loans held for sale, fair value over/(under) unpaid principal balance	$ 8,328	$ 5,811

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
YTD Losses, Loans held for sale	$ (4)	$ (3)
YTD Losses, Impaired Loans	4,781	(12,301)
YTD Losses, OREO	(340)	(910)
Loans held for sale	365,440	247,104
Impaired Loans	76,577	121,355
OREO	14,469	16,865
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	0	0
Impaired Loans	0	0
OREO	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	5,153	2,742
Impaired Loans	65,604	108,899
OREO	14,391	16,865
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	0	0
Impaired Loans	10,973	12,456
OREO	$ 78	$ 0

Fair Value Measurements - Sum_3

Fair Value Measurements - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 1,253,573	$ 1,020,396	$ 1,092,926	$ 1,666,167
Securities available for sale	2,345,791	2,337,039
Securities held to maturity	6,461	19,999
Other securities	201,912	176,955
Loans held for sale	370,593	249,846
Loans	13,635,266	13,422,222
Derivative financial assets	8,619	6,504
Deposits	14,404,085	13,994,749
Derivative financial liabilities	5,622	3,002
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,253,573	1,020,396
Securities available for sale	2,345,791	2,337,039
Securities held to maturity	6,461	19,999
Other securities	201,912	176,955
Loans held for sale	370,593	249,846
Loans	13,558,866	13,422,222
Derivative financial assets	8,619	6,504
Deposits	14,404,085	13,994,749
Short-term borrowings	122,159	351,327
Long-term borrowings	1,783,567	1,499,103
Derivative financial liabilities	5,622	3,002
Carrying Amount [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	9,098	9,734
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,253,573	1,020,396
Securities available for sale	2,345,791	2,337,039
Securities held to maturity	6,483	18,655
Other securities	200,367	168,107
Loans held for sale	370,593	249,846
Loans	13,076,745	12,657,073
Derivative financial assets	8,619	6,504
Deposits	14,372,448	13,954,574
Short-term borrowings	122,159	351,327
Long-term borrowings	1,762,173	1,475,237
Derivative financial liabilities	5,622	3,002
Fair Value [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	9,098	9,734
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Securities available for sale	6,712	6,822
Securities held to maturity	0	0
Other securities	0	0
Loans held for sale	0	0
Loans	0	0
Derivative financial assets	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	9,098	9,734
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,253,573	1,020,396
Securities available for sale	2,333,666	2,324,300
Securities held to maturity	5,463	15,635
Other securities	0	0
Loans held for sale	5,153	2,742
Loans	0	0
Derivative financial assets	492	2,401
Deposits	14,372,448	13,954,574
Short-term borrowings	122,159	351,327
Long-term borrowings	1,762,173	1,475,237
Derivative financial liabilities	5,622	3,002
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	5,413	5,917
Securities held to maturity	1,020	3,020
Other securities	200,367	168,107
Loans held for sale	365,440	247,104
Loans	13,076,745	12,657,073
Derivative financial assets	8,127	4,103
Deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Derivative financial liabilities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Marketable Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	$ 0	$ 0

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	May 18, 2016	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares of stock, option plan, maximum	1,700,000
Aggregate number of shares issued in respect of restricted stock awards	500,000
Options available for award each plan year	1,200,000
Maximum number of shares of restricted stock or shares subject to a restricted stock units award granted								50,000
Maximum number of options and SARs								100,000
Maximum number of stock options and SARs awarded								10,000
Maximum number of Shares of restricted stock or shares subject to a restricted stock units award granted to individual non-employee director								5,000
Vesting period of awards						1/3 per year
Recognition of compensation expense		$ 1,198		$ 1,024		$ 2,311	$ 1,992
Maximum term for awards granted (years)						10 years
Shares issued related stock option exercises		14,144	33,816	27,046	15,043	47,960	42,089
Total intrinsic value of options exercised						$ 713	$ 630
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						4 years

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Stock Option Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure Stock Based Compensation Stock Option Plan [Abstract]
Shares, Outstanding, Beginning balance		1,730,389			1,730,389
Shares, Granted					240,205
Shares, Exercised	(14,144)	(33,816)	(27,046)	(15,043)	(47,960)	(42,089)
Shares, Forfeited or expired					(12,548)
Shares, Outstanding, Ending balance	1,910,086				1,910,086
Shares, Exercisable at June 30, 2019	1,314,149				1,314,149
Aggregate Intrinsic Value, Outstanding at June 30, 2019	$ 9,445,566				$ 9,445,566
Aggregate Intrinsic Value, Exercisable at June 30, 2019	$ 9,355,396				$ 9,355,396
Weighted Average Remaining Contractual Term, Outstanding at June 30, 2019					5 years 8 months 12 days
Weighted Average Remaining Contractual Term, Exercisable at June 30, 2019					4 years 3 months 18 days
Weighted Average Exercise Price, Outstanding, Beginning balance		$ 32.43			$ 32.43
Weighted Average Exercise Price, Granted					38.49
Weighted Average Exercise Price, Exercised					21.92
Weighted Average Exercise Price, Forfeited or expired					35.27
Weighted Average Exercise Price, Outstanding, Ending balance	$ 33.43				33.43
Weighted Average Exercise Price, Exercisable	$ 30.76				$ 30.76

Stock Based Compensation - Stat

Stock Based Compensation - Status of United's Nonvested Stock Option Awards (Detail)	6 Months Ended
	Jun. 30, 2019$ / sharesshares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Nonvested, Beginning balance | shares	575,672
Shares, Granted | shares	240,205
Shares, Vested | shares	(210,876)
Shares, Forfeited or expired | shares	(9,064)
Shares, Nonvested, Ending balance | shares	595,937
Weighted-Average Grant Date Fair Value Per Share, Nonvested Beginning balance | $ / shares	$ 7.86
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	7.16
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	7.74
Weighted-Average Grant Date Fair Value Per Share, Forfeited or expired | $ / shares	7.65
Weighted-Average Grant Date Fair Value Per Share, Nonvested Ending balance | $ / shares	$ 7.62

Stock Based Compensation - Chan

Stock Based Compensation - Changes to United's Restricted Common Shares (Detail) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2019$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning balance | shares	199,303
Shares, Granted | shares	126,427
Shares, Vested | shares	(73,535)
Shares, Forfeited | shares	(2,539)
Number of Shares, Outstanding, Ending balance | shares	249,656
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Beginning balance | $ / shares	$ 39.67
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	38.49
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	39.28
Weighted-Average Grant Date Fair Value Per Share, Forfeited | $ / shares	39.49
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Ending balance | $ / shares	$ 39.19

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial gains (losses), before tax			$ 55,535
Unrecognized actuarial gains (losses), net of tax			$ 42,595
Amortization expected to be recognized	$ 4,744
Amortization expected to be recognized, net of tax	3,639
Employer discretionary contribution amount	$ 0	$ 7,000

Employee Benefit Plans - Net Pe

Employee Benefit Plans - Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 561	$ 666	$ 1,116	$ 1,324
Interest cost	1,459	1,308	2,901	2,603
Expected return on plan assets	(2,356)	(2,551)	(4,686)	(5,073)
Recognized net actuarial loss	1,184	1,162	2,355	2,311
Net periodic pension (benefit) cost	$ 848	$ 585	$ 1,686	$ 1,165
Weighted-Average Assumptions:
Discount rate	4.52%	3.83%	4.52%	3.83%
Expected return on assets	7.00%	7.00%	7.00%	7.00%
Rate of Compensation Increase	3.00%	3.00%	3.00%	3.00%
Prior to Age 45 [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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Taxes [Line Items]
Accrued interest related to uncertain tax positions	$ 726	$ 721	$ 726	$ 721
Effective tax rate	20.69%	22.50%	21.04%	22.49%

Comprehensive Income - Componen

Comprehensive Income - Components of Total Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net Income	$ 67,207	$ 63,642	$ 66,274	$ 61,706	$ 130,849	$ 127,980
AFS securities with OTTI charges during the period	(75)		0		(75)	0
Related income tax effect	17		0		17	0
Less: OTTI charges recognized in net income	75		0		75	0
Related income tax benefit	(17)		0		(17)	0
Reclassification of previous noncredit OTTI to credit OTTI	2,188		0		2,188	0
Related income tax benefit	(510)		0		(510)	0
Net unrealized (losses) gains on AFS securities with OTTI	1,678		0		1,678	0
Change in net unrealized gain on AFS securities arising during the period	21,141		(10,684)		43,379	(32,701)
Related income tax effect	(4,925)		4,162		(10,107)	9,292
Net reclassification adjustment for (gains) losses included in net income	130		27		(218)	176
Related income tax expense (benefit)	(30)		(6)		51	(41)
Total AFS securities - all other	16,316		(6,501)		33,105	(23,274)
Net effect of AFS securities on other comprehensive income	17,994		(6,501)		34,783	(23,274)
Accretion on the unrealized loss for securities transferred from AFS to the HTM investment portfolio prior to call or maturity	0		2		0	4
Related income tax expense	0		(1)		0	(2)
Net effect of HTM securities on other comprehensive income	0		1		0	2
Pension plan:
Recognized net actuarial loss	1,184		1,162		2,355	2,311
Related income tax benefit	(275)		(110)		(536)	(526)
Net effect of change in pension plan asset on other comprehensive income	909		1,052		1,819	1,785
Net current-period other comprehensive income, net of tax	18,903	17,699	(5,448)	(16,039)	36,602	(21,487)
Total Comprehensive Income	$ 86,110	$ 81,341	$ 60,826	$ 45,667	$ 167,451	$ 106,493

Comprehensive Income - Compon_2

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 3,286,891	$ 3,251,624	$ 3,251,313	$ 3,240,530	$ 3,251,624	$ 3,240,530
Reclass due to adopting Accounting Standard Update 2017-12		50		0
Net current-period other comprehensive income, net of tax	18,903	17,699	(5,448)	(16,039)	36,602	(21,487)
Ending Balance	3,333,858	3,286,891	3,242,565	3,251,313	3,333,858	3,242,565
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(36,680)			(36,680)
Reclass due to adopting Accounting Standard Update 2017-12					0
Other comprehensive income before reclassification					0
Amounts reclassified from accumulated other comprehensive income					1,819
Net current-period other comprehensive income, net of tax					1,819
Ending Balance	(36,861)				(36,861)
Unrealized Gains/Losses on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(18,289)			(18,289)
Reclass due to adopting Accounting Standard Update 2017-12					0
Other comprehensive income before reclassification					33,272
Amounts reclassified from accumulated other comprehensive income					1,511
Net current-period other comprehensive income, net of tax					34,783
Ending Balance	16,494				16,494
Accumulated Unrealized Loss On Securities Available For Sale Transferred To Held To Maturity [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(50)			(50)
Reclass due to adopting Accounting Standard Update 2017-12					50
Other comprehensive income before reclassification					0
Amounts reclassified from accumulated other comprehensive income					0
Net current-period other comprehensive income, net of tax					0
Ending Balance	0				0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(39,270)	(57,019)	(64,553)	(42,025)	(57,019)	(42,025)
Reclass due to adopting Accounting Standard Update 2017-12		50		(6,353)	50
Other comprehensive income before reclassification					33,272
Amounts reclassified from accumulated other comprehensive income					3,330
Net current-period other comprehensive income, net of tax	18,903	17,699	(5,448)	(16,039)	36,602
Ending Balance	$ (20,367)	$ (39,270)	$ (70,001)	$ (64,553)	$ (20,367)	$ (70,001)

Comprehensive Income - Reclassi

Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Available for sale ("AFS") securities:
Income before income taxes		$ 84,736		$ 85,515		$ 165,706	$ 165,120
Related income tax effect		(17,529)		(19,241)		(34,857)	(37,140)
Net income		67,207	$ 63,642	66,274	$ 61,706	130,849	127,980
Pension plan:
Income before income taxes		84,736		85,515		165,706	165,120
Related income tax effect		(17,529)		(19,241)		(34,857)	(37,140)
Net income		$ 67,207	$ 63,642	$ 66,274	$ 61,706	130,849	$ 127,980
Reclassification out of Accumulated Other Comprehensive Income [Member]
Available for sale ("AFS") securities:
Net income						3,330
Pension plan:
Net income						3,330
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains/Losses on AFS Securities [Member]
Available for sale ("AFS") securities:
Reclassification of previous noncredit OTTI to credit OTTI						2,188
Net reclassification adjustment for losses (gains) included in net income						(218)
Income before income taxes						1,970
Related income tax effect						(459)
Net income						1,511
Pension plan:
Income before income taxes						1,970
Related income tax effect						(459)
Net income						1,511
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Available for sale ("AFS") securities:
Income before income taxes						2,355
Related income tax effect						(536)
Net income						1,819
Pension plan:
Recognized net actuarial loss	[1]					2,355
Income before income taxes						2,355
Related income tax effect						(536)
Net income						$ 1,819
[1]	This AOCI component is included in the net periodic pension cost (see Note 14, Employee Benefit Plans)

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation of Numerator and Denominator of Basic Earnings Per Share with that of Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Distributed earnings allocated to common stock	$ 34,604	$ 35,516	$ 69,276	$ 71,195
Undistributed earnings allocated to common stock	32,446	30,637	61,276	56,557
Net earnings allocated to common shareholders	$ 67,050	$ 66,153	$ 130,552	$ 127,752
Average common shares outstanding	101,773,643	104,682,910	101,833,880	104,770,681
Common stock equivalents	274,202	269,878	265,929	287,333
Average diluted shares outstanding	102,047,845	104,952,788	102,099,809	105,058,014
Earnings per basic common share	$ 0.66	$ 0.63	$ 1.28	$ 1.22
Earnings per diluted common share	$ 0.66	$ 0.63	$ 1.28	$ 1.22

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019Trust
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Number of statutory business trusts	14
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, 2019USD ($)
United Statutory Trust III [Member]
Variable Interest Entity [Line Items]
Amount of Capital Securities Issued	$ 20,000
Interest Rate	3-month LIBOR + 2.85%
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
Interest Rate	3-month LIBOR + 2.85%
Maturity Date	Jan. 23, 2034
United Statutory Trust V [Member]
Variable Interest Entity [Line Items]
Amount of Capital Securities Issued	$ 50,000
Interest Rate	3-month LIBOR + 1.55%
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
Interest Rate	3-month LIBOR + 1.30%
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
Interest Rate	3-month LIBOR + 3.10%
Maturity Date	Oct. 8, 2033
Premier Statutory Trust III [Member]
Variable Interest Entity [Line Items]
Amount of Capital Securities Issued	$ 8,000
Interest Rate	3-month LIBOR + 1.74%
Maturity Date	Jun. 15, 2035
Premier Statutory Trust IV [Member]
Variable Interest Entity [Line Items]
Amount of Capital Securities Issued	$ 14,000
Interest Rate	3-month LIBOR + 1.55%
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
Interest Rate	3-month LIBOR + 1.61%
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
Interest Rate	3-month LIBOR + 2.29%
Maturity Date	Sep. 20, 2034
Centra Statutory Trust II [Member]
Variable Interest Entity [Line Items]
Amount of Capital Securities Issued	$ 10,000
Interest Rate	3-month LIBOR + 1.65%
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
Interest Rate	6-month LIBOR + 3.30%
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
Interest Rate	3-month LIBOR + 1.42%
Maturity Date	Feb. 23, 2036
Cardinal Statutory Trust I [Member]
Variable Interest Entity [Line Items]
Amount of Capital Securities Issued	$ 20,000
Interest Rate	3-month LIBOR + 2.40%
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
Interest Rate	3-month LIBOR + 2.10%
Maturity Date	Mar. 15, 2035

Variable Interest Entities - Su

Variable Interest Entities - Summary of Quantitative Information Related to Significant Involvement in Unconsolidated Variable Interest Entities (Detail) - Trust Preferred Securities [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Variable Interest Entity [Line Items]
Aggregate Assets	$ 257,888	$ 257,754
Aggregate Liabilities	248,746	248,741
Risk Of Loss	$ 9,142	$ 9,013

Segment Information - Additiona

Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2019Segment
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, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 150,553		$ 149,122		$ 294,721	$ 293,165
Provision for loans losses	5,417		6,204		10,413	11,382
Other income	39,795		36,007		71,018	67,199
Other expense	100,195		93,410		189,620	183,862
Income taxes	17,529		19,241		34,857	37,140
Net income	67,207	$ 63,642	66,274	$ 61,706	130,849	127,980
Total assets (liabilities)	19,882,539		19,207,603		19,882,539	19,207,603
Average assets (liabilities)	19,515,854		18,712,384		19,383,507	18,628,621
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	152,517		149,448		298,407	295,070
Provision for loans losses	5,417		6,204		10,413	11,382
Other income	18,398		17,465		36,050	35,235
Other expense	82,304		76,495		158,298	148,986
Income taxes	17,207		18,948		34,873	38,224
Net income	65,987		65,266		130,873	131,713
Total assets (liabilities)	19,735,901		19,112,133		19,735,901	19,112,133
Average assets (liabilities)	19,447,629		18,658,168		19,324,956	18,583,975
Operating Segments [Member] | Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	111		264		166	640
Provision for loans losses	0		0		0	0
Other income	23,501		23,468		39,607	38,351
Other expense	18,771		21,225		33,613	39,609
Income taxes	1,004		564		1,286	(139)
Net income	3,837		1,943		4,874	(479)
Total assets (liabilities)	442,188		388,292		442,188	388,292
Average assets (liabilities)	326,525		335,781		296,008	274,211
Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(3,209)		(3,032)		(6,532)	(5,626)
Provision for loans losses	0		0		0	0
Other income	53		68		255	(754)
Other expense	143		(1,758)		(77)	(2,181)
Income taxes	(682)		(271)		(1,302)	(945)
Net income	(2,617)		(935)		(4,898)	(3,254)
Total assets (liabilities)	16,729		10,895		16,729	10,895
Average assets (liabilities)	5,387		6,776		1,824	9,231
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net interest income	1,134		2,442		2,680	3,081
Provision for loans losses	0		0		0	0
Other income	(2,157)		(4,994)		(4,894)	(5,633)
Other expense	(1,023)		(2,552)		(2,214)	(2,552)
Income taxes	0		0		0	0
Net income	0		0		0	0
Total assets (liabilities)	(312,279)		(303,717)		(312,279)	(303,717)
Average assets (liabilities)	$ (263,687)		$ (288,341)		$ (239,281)	$ (238,796)