United Bankshares (UBSI) 10-Q 9 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 31, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Trading Symbol	UBSI
Entity Registrant Name	UNITED BANKSHARES INC/WV
Entity Central Index Key	729,986
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		76,379,927

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 179,023	$ 136,690
Interest-bearing deposits with other banks	921,722	719,923
Federal funds sold	724	722
Total cash and cash equivalents	1,101,469	857,335
Securities available for sale at estimated fair value (amortized cost-$1,309,638 at June 30, 2016 and $1,072,340 at December 31, 2015)	1,323,709	1,066,334
Securities held to maturity (estimated fair value-$30,759 at June 30, 2016 and $36,319 at December 31, 2015)	34,029	39,099
Other investment securities	125,413	98,749
Loans held for sale	6,226	10,681
Loans	10,437,354	9,398,952
Less: Unearned income	(14,496)	(14,872)
Loans net of unearned income	10,422,858	9,384,080
Less: Allowance for loan losses	(72,448)	(75,726)
Net loans	10,350,410	9,308,354
Bank premises and equipment	77,215	73,089
Goodwill	866,176	710,252
Accrued interest receivable	37,668	35,801
Other assets	415,697	378,250
TOTAL ASSETS	14,338,012	12,577,944
Deposits:
Noninterest-bearing	3,141,148	2,699,958
Interest-bearing	7,174,705	6,641,569
Total deposits	10,315,853	9,341,527
Borrowings:
Federal funds purchased	8,300	22,230
Securities sold under agreements to repurchase	377,146	341,661
Federal Home Loan Bank borrowings	1,295,829	850,880
Other long-term borrowings	223,940	223,506
Reserve for lending-related commitments	1,394	936
Accrued expenses and other liabilities	102,410	84,569
TOTAL LIABILITIES	12,324,872	10,865,309
Shareholders' Equity
Preferred stock, $1.00 par value; Authorized-50,000,000 shares, none issued
Common stock, $2.50 par value; Authorized-100,000,000 shares; issued-76,323,780 and 69,626,932 at June 30, 2016 and December 31, 2015, respectively, including 27,634 and 23,835 shares in treasury at June 30, 2016 and December 31, 2015, respectively	190,809	174,067
Surplus	1,004,285	752,997
Retained earnings	842,940	824,603
Accumulated other comprehensive loss	(23,943)	(38,212)
Treasury stock, at cost	(951)	(820)
TOTAL SHAREHOLDERS' EQUITY	2,013,140	1,712,635
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 14,338,012	$ 12,577,944

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 1,309,638	$ 1,072,340
Securities held to maturity	$ 30,759	$ 36,319
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	100,000,000	100,000,000
Common stock, shares issued	76,323,780	69,626,932
Common stock, shares in treasury	27,634	23,835

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest income
Interest and fees on loans	$ 103,329	$ 96,704	$ 202,663	$ 191,853
Interest on federal funds sold and other short-term investments	642	350	1,264	681
Interest and dividends on securities:
Taxable	8,257	7,582	15,964	15,771
Tax-exempt	859	896	1,692	1,776
Total interest income	113,087	105,532	221,583	210,081
Interest expense
Interest on deposits	6,670	6,796	13,555	13,681
Interest on short-term borrowings	365	209	579	440
Interest on long-term borrowings	3,327	2,625	6,440	5,309
Total interest expense	10,362	9,630	20,574	19,430
Net interest income	102,725	95,902	201,009	190,651
Provision for loan losses	7,667	5,716	11,702	11,070
Net interest income after provision for loan losses	95,058	90,186	189,307	179,581
Other income
Fees from trust and brokerage services	4,792	4,931	9,661	9,823
Fees from deposit services	8,390	10,434	16,363	20,207
Bankcard fees and merchant discounts	1,365	1,231	2,203	2,045
Other service charges, commissions, and fees	796	639	1,225	1,117
Income from bank-owned life insurance	1,192	1,258	2,372	2,531
Income from mortgage banking	789	663	1,517	1,208
Other income	430	339	801	743
Total other-than-temporary impairment losses	339	0	339	(100)
Portion of loss recognized in other comprehensive income	(372)	0	(372)	66
Net other-than-temporary impairment losses	(33)	0	(33)	(34)
Net gains on sales/calls of investment securities	246	3	250	49
Net investment securities gains	213	3	217	15
Total other income	17,967	19,498	34,359	37,689
Other expense
Employee compensation	22,631	20,724	44,910	40,992
Employee benefits	7,294	6,588	13,897	13,391
Net occupancy expense	7,773	6,542	14,026	13,071
Other real estate owned (OREO) expense	2,663	1,121	3,312	2,234
Equipment expense	2,058	2,020	4,065	4,144
Data processing expense	3,596	3,867	7,147	7,610
Bankcard processing expense	435	353	803	702
FDIC insurance expense	2,135	2,061	4,255	4,155
Other expense	16,270	14,454	30,496	29,086
Total other expense	64,855	57,730	122,911	115,385
Income before income taxes	48,170	51,954	100,755	101,885
Income taxes	16,378	17,145	34,257	32,449
Net income	$ 31,792	$ 34,809	$ 66,498	$ 69,436
Earnings per common share:
Basic	$ 0.44	$ 0.50	$ 0.94	$ 1
Diluted	0.44	0.50	0.94	1
Dividends per common share	$ 0.33	$ 0.32	$ 0.66	$ 0.64
Average outstanding shares:
Basic	71,483,703	69,305,612	70,490,596	69,256,831
Diluted	71,809,021	69,587,417	70,766,964	69,531,839

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 31,792	$ 34,809	$ 66,498	$ 69,436
Change in net unrealized gain (loss) on available-for-sale (AFS) securities, net of tax	4,316	(6,100)	12,809	(766)
Accretion of the net unrealized loss on the transfer of AFS securities to held-to-maturity (HTM) securities, net of tax	1	2	2	3
Change in pension plan assets, net of tax	729	768	1,458	1,536
Comprehensive income, net of tax	$ 36,838	$ 29,479	$ 80,767	$ 70,209

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at January 1, 2016 at Dec. 31, 2015	$ 1,712,635	$ 174,067	$ 752,997	$ 824,603	$ (38,212)	$ (820)
Beginning Balance, shares at Dec. 31, 2015		69,626,932
Comprehensive income:
Net income	66,498	$ 0	0	66,498	0	0
Other comprehensive income, net of tax	14,269	0	0	0	14,269	0
Comprehensive income, net of tax	80,767
Stock based compensation expense	1,330	0	1,330	0	0	0
Acquisition of Bank of Georgetown (6,527,746)	264,505	$ 16,319	248,186	0	0	0
Acquisition of Bank of Georgetown, shares		6,527,746
Purchase of treasury stock	0	$ 0	0	0	0	0
Distribution of treasury stock from deferred compensation plan	0	0	0	0	0	0
Cash dividends	(48,161)	0	0	(48,161)	0	0
Grant of restricted stock	0	161	(161)	0	0	0
Forfeiture of restricted stock	0	0	131	0	0	(131)
Common stock options exercised	2,064	262	1,802	0	0	0
Balance at June 30, 2016 at Jun. 30, 2016	$ 2,013,140	$ 190,809	$ 1,004,285	$ 842,940	$ (23,943)	$ (951)
Ending Balance, shares at Jun. 30, 2016		76,323,780

Consolidated Statement of Chan7

Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical)	6 Months Ended
	Jun. 30, 2016$ / sharesshares
Cash dividends per share | $ / shares	$ 0.66
Common stock options exercised, shares	105,010
Common Stock [Member]
Acquisition of Bank of Georgetown, shares	6,527,746
Purchase of treasury stock, shares	0
Distribution of treasury stock from deferred compensation plan, shares	0
Grant of restricted stock, shares	64,092
Forfeiture of restricted stock, shares	3,793
Common stock options exercised, shares	105,010
Treasury Stock [Member]
Purchase of treasury stock, shares	9
Distribution of treasury stock from deferred compensation plan, shares	3

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Cash Flows [Abstract]
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 74,928	$ 72,371
INVESTING ACTIVITIES
Proceeds from maturities and calls of securities held to maturity	5,002	184
Proceeds from sales of securities available for sale	103,399	3,436
Proceeds from maturities and calls of securities available for sale	90,833	84,031
Purchases of securities available for sale	(216,315)	(36,057)
Purchases of bank premises and equipment	(2,463)	(2,279)
Proceeds from sales of bank premises and equipment	0	994
Purchases of other investment securities	(40,245)	(10,561)
Proceeds from sales and redemptions of other investment securities	18,299	14,449
Acquisition of Bank of Georgetown, net of cash paid	29,330	0
Net change in loans	(79,923)	15,687
NET CASH (USED IN) PROVIDED BY INVESTING ACTIVITIES	(92,083)	69,884
FINANCING ACTIVITIES
Cash dividends paid	(45,969)	(44,374)
Excess tax benefits from stock-based compensation arrangements	1,304	635
Acquisition of treasury stock	0	0
Proceeds from exercise of stock options	2,089	4,558
Repayment of long-term Federal Home Loan Bank borrowings	(725,051)	(790,395)
Proceeds from issuance of long-term Federal Home Loan Bank borrowings	795,000	665,000
Distribution of treasury stock for deferred compensation plan	0	0
Changes in:
Deposits	2,641	238,182
Federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings	231,275	(51,824)
NET CASH PROVIDED BY FINANCING ACTIVITIES	261,289	21,782
Increase in cash and cash equivalents	244,134	164,037
Cash and cash equivalents at beginning of year	857,335	753,064
Cash and cash equivalents at end of period	$ 1,101,469	$ 917,101

Summary of New Accounting Stand

Summary of New Accounting Standards	6 Months Ended
	Jun. 30, 2016
Accounting Changes and Error Corrections [Abstract]
Summary of New Accounting Standards	1. SUMMARY OF NEW ACCOUNTING STANDARDS In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses.” ASU 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 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. ASU 2016-13 is effective for United on January 1, 2020, with early adoption permitted, and management is currently evaluating the possible impact this standard may have on the Company’s financial condition or results of operations. In March 2016, the FASB issued ASU 2016-09, “Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 will change certain aspects of accounting for share-based payments to employees. The new guidance will, amongst other things, require all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also will allow an employer to repurchase more of an employee’s shares than it can today for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. ASU 2016-09 is effective for United on January 1, 2017, and 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 2016-02, “Leases (Topic 842)”. ASU 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 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. ASU 2016-02 is effective for United on January 1, 2019 and management is currently evaluating the possible impact this standard may have on the Company’s financial condition or results of operations. In January 2016, the FASB issued ASU 2016-01, “Financial Instruments Overall: Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01 makes changes to the classification and measurement of investments in equity securities, the presentation of certain fair value changes for financial liabilities measured at fair value under the fair value option and disclosure of fair value of instruments. In addition, ASU 2016-01 clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. ASU 2016-01 is effective for United on January 1, 2018 and is not expected to have a significant impact on the Company’s financial condition or results of operations. In September 2015, the FASB issued ASU 2015-16, “Simplifying the Accounting for Measurement-Period Adjustments” associated with a business combination, as part of its simplification initiative. ASU 2015-16 requires an acquirer to “recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined.” In addition, the acquirer must record, in the financial statements for the same period, “the effect on earnings of changes in depreciation, amortization, or other income effect, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date.” Entities must also “present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in the current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amount had been recognized as of the acquisition date.” ASU 2015-16 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In May 2015, the FASB issued ASU 2015-07, “Disclosures for Investment in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent), a consensus of the FASB Emerging Issues Task Force.” ASU 2015-07 modifies certain provisions of FASB Accounting Standards Codification Topic 820, Fair Value Measurement (ASC 820). ASU 2015-07 eliminates the requirement to categorize investments in the fair value hierarchy if an investment’s fair value is measured based on net asset value (NAV) per share (or its equivalent) using the practical expedient. The reporting entities will no longer be required to provide the related fair value disclosures for these securities but instead, will be required to disclose information to help users understand the nature of the investments as well as risks, including whether it is probable that the amount realized on the sale of the investments would differ from net asset value. ASU 2015-07 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In April 2015, the FASB issued ASU 2015-04, “Compensation – Retirement Benefits: Practical Expedient for the Measurement Date of an Employer’s Defined Benefit Obligation and Plan Assets.” ASU 2015-04 gives an employer whose fiscal year-end does not coincide with a calendar month-end the ability, as a practical expedient, to measure defined benefit retirement obligations and related plan assets as of the month-end that is closest to its fiscal year-end. ASU 2015-04 also provides guidance on accounting for contributions to the plan and significant events that require a remeasurement that occur during the period between a month-end measurement and the employer’s fiscal year-end. ASU 2015-04 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In April 2015, the FASB issued ASU 2015-03, “Simplifying the Presentation of Debt Issuance Costs.” Under ASU 2015-03, debt issuance costs are required to be presented as a direct deduction of debt balances on the statement of financial condition, similar to the presentation of debt discounts. ASU 2015-03 is limited to simplifying the presentation of debt issuance costs and does not change the recognition and measurement guidance for debt issuance costs. ASU 2015-03 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In February 2015, the FASB issued ASU 2015-02, “Amendments to the Consolidation Analysis.” ASU 2015-02 improves targeted areas of the consolidation guidance and reduces the number of consolidation models. The new consolidation standard eliminates the deferral of FAS 167 and makes changes to both the variable interest model and the voting model in ASC 810. ASU 2015-02 affects all entities, could change consolidation conclusions and may trigger additional disclosures. ASU 2015-02 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In January 2015, the FASB issued ASU 2015-01, “Income Statement, Extraordinary and Unusual Items (Subtopic 225-20).” ASU 2015-01 eliminates the separate presentation of extraordinary items but does not change the requirement to disclose material items that are unusual or infrequent in nature. Eliminating the concept of extraordinary items will allow entities to no longer have to assess whether a particular event or transaction is both unusual in nature and infrequent in occurrence. ASU 2015-01 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In June 2014, the FASB issued ASU 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period.” ASU 2014-12 amends the guidance in FASB ASC 718, “Compensation-Stock Compensation”, to bring consistency to the accounting for share-based payment awards that require a specific performance target to be achieved in order for employees to become eligible to vest in the awards. The amendments affect all entities that grant their employees share-based payments in which the terms of the award provide that a performance target that affects vesting could be achieved after the requisite service period. ASU 2014-12 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” ASU 2014-09 supersedes the revenue recognition requirements in Accounting Standards Codification Topic 605, “Revenue Recognition”, and most industry-specific guidance throughout the Accounting Standards Codification. The amendments require an entity to recognize revenue upon the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The new revenue recognition standard sets forth a five step principle-based approach for determining revenue recognition. In April 2015, the FASB voted to defer the effective date of ASU 2014-09 by one-year for both public and private companies, and gave both public and private companies the option to “early” adopt using the original effective dates. ASU 2014-09 now will be effective for United on January 1, 2018 with early adoption permitted on January 1, 2017. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operations.

Mergers and Acquisitions

Mergers and Acquisitions	6 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Mergers and Acquisitions	2. MERGERS AND ACQUISITIONS After the close of business on June 3, 2016 (Acquisition Date), United acquired 100% of the outstanding common stock of Bank of Georgetown, a privately held community bank headquartered in Washington, D.C. With this transaction, United continues to expand its existing footprint in the D.C. Metro Region. The results of operations of Bank of Georgetown are included in the consolidated results of operations from the Acquisition Date. At consummation, Bank of Georgetown had assets of $1,278,841 loans of $999,773 and deposits of $971,369. The transaction was accounted for under the acquisition method of accounting and accordingly, assets acquired, liabilities assumed and consideration exchanged were recorded at estimated fair value on the Acquisition Date. The aggregate purchase price was approximately $264,505, including common stock valued at $253,799, stock options assumed valued at $10,696, and cash paid for fractional shares of $10. The number of shares issued in the transaction was 6,527,746, which were valued based on the closing market price of $38.88 for United’s common shares on June 3, 2016. The preliminary purchase price has been allocated to the identifiable tangible and intangible assets resulting in preliminary additions to goodwill and core deposit intangibles of $155,924 and $11,406, respectively. The core deposit intangibles are expected to be amortized over ten years. Because the consideration paid was greater than the net fair value of the acquired assets and liabilities, the Company recorded goodwill as part of the acquisition. None of the goodwill from the Bank of Georgetown acquisition is expected to be deductible for tax purposes. Because the merger occurred on June 3, 2016, the initial accounting for the business combination is incomplete at this time. United is using an independent third party to help determine the fair values of the assets and liabilities acquired from the Bank of Georgetown. However, United did record some preliminary fair value adjustments on certain acquired assets and liabilities which are subject to refinement for up to one year after the closing date of the acquisition. United recorded a downward fair value adjustment of $33,567 on the loans acquired and a premium on interest-bearing deposits acquired of $316. The premium amount on deposits will be accreted on an accelerated basis over the estimated remaining life of the deposits at the time of acquisition. United assumed approximately $300 of liabilities to provide severance benefits to terminated employees of Bank of Georgetown, which has no remaining balance as of June 30, 2016. The estimated fair values of the acquired assets and assumed liabilities, including identifiable intangible assets are preliminary as of June 30, 2016 and are subject to refinement as additional information relative to closing date fair values becomes available. Any subsequent adjustments to the fair values of acquired assets and liabilities assumed, identifiable intangible assets, or other purchase accounting adjustments will result in adjustments to goodwill within the first 12 months following the date of acquisition. In many cases, determining the estimated fair value of the acquired assets and assumed liabilities required United to estimate cash flows expected to result from those assets and liabilities and to discount those cash flows at appropriate rates of interest. The most significant of those determinations related to the fair valuation of acquired loans. The fair value of the acquired loans is based on the present value of the expected cash flows. Periodic principal and interest cash flows are adjusted for expected losses and prepayments, then discounted to determine the present value and summed to arrive at the estimated fair value. For such loans, the excess of cash flows expected at acquisition over the estimated fair value is recognized as interest income over the remaining lives of the loans. The difference between contractually required payments at acquisition and the cash flows expected to be collected at acquisition reflects the impact of estimated credit losses and other factors, such as prepayments. In accordance with GAAP, there was no carry-over of Bank of Georgetown’s previously established allowance for loan losses. As a result, standard industry coverage ratios with regard to the allowance for credit losses may be less comparable to financial institutions without acquired loans. The acquired loans will be divided into loans with evidence of credit quality deterioration, which are accounted for under ASC topic 310-30 (acquired impaired) and loans that do not meet this criteria, which are accounted for under ASC topic 310-20 (acquired performing). Acquired impaired loans have experienced a deterioration of credit quality from origination to acquisition for which it is probable that United will be unable to collect all contractually required payments receivable, including both principal and interest. Subsequent decreases in the expected cash flows require United to evaluate the need for additions to the Company’s allowance for credit losses. Subsequent improvements in expected cash flows generally result in the recognition of additional interest income over the then remaining lives of the loans. United is the process of determining the fair value of the acquired impaired loans and the acquired performing loans, with the assistance of an independent third party, in order to provide all the required acquired loans’ disclosures going forward. The consideration paid for Bank of Georgetown’s common equity and the amounts of acquired identifiable assets and liabilities assumed as of the Acquisition Date were as follows: Purchase price: Value of common shares issued (6,527,746 shares) $ 253,799 Fair value of stock options assumed 10,696 Cash for fractional shares 10 Total purchase price 264,505 Identifiable assets: Cash and cash equivalents 29,340 Investment securities 219,781 Loans 966,206 Premises and equipment 5,581 Core deposit intangibles 11,406 Other assets 27,828 Total identifiable assets $ 1,260,142 Identifiable liabilities: Deposits $ 971,685 Short-term borrowings 101,020 Long-term borrowings 65,000 Other liabilities 13,856 Total identifiable liabilities 1,151,561 Preliminary fair value of net assets acquired including identifiable intangible assets 108,581 Preliminary resulting goodwill $ 155,924 The operating results of United for the six months ended June 30, 2016 include operating results of acquired assets and assumed liabilities subsequent to the Acquisition Date. The operations of United’s metropolitan Washington D.C. geographic area, which primarily includes the acquired operations of Bank of Georgetown, provided $15,780 in total revenues, which represents net interest income plus other income, and $6,746 in net income from the period from the Acquisition Date to June 30, 2016. These amounts are included in United’s consolidated financial statements as of and for the six months ended June 30, 2016. Bank of Georgetown’s results of operations prior to the Acquisition Date are not included in United’s consolidated financial statements. The following table presents certain unaudited pro forma information for the results of operations for the six months ended June 30, 2016 and 2015, as if the Bank of Georgetown merger had occurred on January 1, 2016 and 2015, respectively. These results combine the historical results of Bank of Georgetown into United’s consolidated statement of income and, while certain adjustments were made for the estimated impact of certain fair valuation adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place on the indicated date nor are they intended to represent or be indicative of future results of operations. In particular, no adjustments have been made to eliminate the amount of Bank of Georgetown’s provision for credit losses for 2016 and 2015 that may not have been necessary had the acquired loans been recorded at fair value as of the beginning of 2016 and 2015. Additionally, United expects to achieve operating cost savings and other business synergies as a result of the acquisition which are not reflected in the pro forma amounts. Proforma Six Months Ended June 30 2016 2015 Total Revenues (1) $ 254,509 $ 248,109 Net Income 65,845 72,888 (1) Represents net interest income plus other income

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Investment Securities	3. INVESTMENT SECURITIES Securities held for indefinite periods of time and all marketable equity securities 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, 2016 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 $ 150,733 $ 2,843 $ 0 $ 153,576 $ 0 State and political subdivisions 165,101 5,765 73 170,793 0 Residential mortgage-backed securities Agency 600,988 14,817 64 615,741 0 Non-agency 7,641 176 9 7,808 86 Commercial mortgage-backed securities Agency 299,847 9,209 0 309,056 0 Asset-backed securities 1,831 0 1 1,830 0 Trust preferred collateralized debt obligations 49,275 651 17,917 32,009 25,952 Single issue trust preferred securities 13,337 294 2,373 11,258 0 Other corporate securities 14,995 92 0 15,087 0 Marketable equity securities 5,890 665 4 6,551 0 Total $ 1,309,638 $ 34,512 $ 20,441 $ 1,323,709 $ 26,038 December 31, 2015 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 $ 71,993 $ 1,793 $ 0 $ 73,786 $ 0 State and political subdivisions 130,685 3,144 51 133,778 0 Residential mortgage-backed securities Agency 473,109 5,580 707 477,982 0 Non-agency 9,119 457 5 9,571 458 Commercial mortgage-backed securities Agency 305,990 1,843 1,898 305,935 0 Asset-backed securities 3,404 0 5 3,399 0 Trust preferred collateralized debt obligations 49,386 635 15,335 34,686 25,952 Single issue trust preferred securities 13,811 249 2,367 11,693 0 Other corporate securities 9,999 50 0 10,049 0 Marketable equity securities 4,844 637 26 5,455 0 Total $ 1,072,340 $ 14,388 $ 20,394 $ 1,066,334 $ 26,410 (1) Non-credit related other-than-temporary impairment in accumulated other comprehensive income. Amounts are before-tax. The following is a summary of securities available-for-sale which were in an unrealized loss position at June 30, 2016 and December 31, 2015. Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses June 30, 2016 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 0 $ 0 State and political subdivisions 16,406 73 0 0 Residential mortgage-backed securities Agency 31,918 64 0 0 Non-agency 0 0 268 9 Commercial mortgage-backed securities Agency 0 0 0 0 Asset-backed securities 0 0 1,830 1 Trust preferred collateralized debt obligations 1,126 187 25,983 17,730 Single issue trust preferred securities 4,150 493 3,810 1,880 Marketable equity securities 373 4 0 0 Total $ 53,973 $ 821 $ 31,891 $ 19,620 Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses December 31, 2015 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 0 $ 0 State and political subdivisions 15,550 51 0 0 Residential mortgage-backed securities Agency 90,004 707 0 0 Non-agency 348 5 0 0 Commercial mortgage-backed securities Agency 170,340 1,650 9,255 248 Asset-backed securities 3,399 5 0 0 Trust preferred collateralized debt obligations 3,304 135 28,633 15,200 Single issue trust preferred securities 4,225 404 3,720 1,963 Marketable equity securities 986 26 0 0 Total $ 288,156 $ 2,983 $ 41,608 $ 17,411 Marketable 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 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 those 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 of United and its subsidiaries. Three Months Ended June 30 Six Months Ended June 30 2016 2015 2016 2015 Proceeds from sales and calls $ 159,232 $ 51,381 $ 194,231 $ 87,468 Gross realized gains 250 4 256 54 Gross realized losses 4 1 6 5 At June 30, 2016, gross unrealized losses on available for sale securities were $20,441 on 47 securities of a total portfolio of 567 available for sale securities. Securities in an unrealized loss position at June 30, 2016 consisted primarily of pooled trust preferred collateralized debt obligations (Trup Cdos) and single issue trust preferred securities. The Trup Cdos and the single issue trust preferred securities relate mainly to securities of financial institutions. 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. 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 securities was $900,835 at June 30, 2016. Of the $900,835, $299,847 was related to agency commercial mortgage securities and $600,988 was related to agency residential mortgage securities. Each of the agency mortgage 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, 2016. Non-agency residential mortgage-backed securities United’s non-agency residential mortgage-backed securities portfolio relates to securities of various private label issuers. The Company has no exposure to real estate investment trusts (REITS) in its investment portfolio. The total amortized cost of available for sale non-agency residential mortgage-backed securities was $7,641 at June 30, 2016. Of the $7,641, $1,516 was rated above investment grade and $6,125 was rated below investment grade. Approximately 27% of the portfolio includes collateral that was originated during the year of 2005 or before. The remaining 73% includes collateral that was originated in the years of 2006 and 2007. The entire portfolio of the non-agency residential mortgage-backed securities is either the senior or super-senior tranches of their respective structure. In determining whether or not the non-agency mortgage-backed securities are other-than-temporarily impaired, management performs an in-depth analysis on each non-agency residential mortgage-backed security on a quarterly basis. The analysis includes a review of the following factors: weighted average loan to value, weighted average maturity, average FICO scores, historical collateral performance, geographic concentration, credit subordination, cross-collateralization, coverage ratios, origination year, full documentation percentage, event risk (repricing), and collateral type. Management completes a quarterly stress test to determine the level of loss protection remaining in each individual security and compares the protection remaining to the future expected performance of the underlying collateral. Additionally, management utilizes a third-party cash flow model to perform a cash flow test for each bond below investment grade. The model produces a bond specific set of cash flows based upon assumptions input by management. The input assumptions that are incorporated include the projected constant default rate (CDR) of the underlying mortgages, the loss severity upon default, and the prepayment rate on the underlying mortgage collateral. CDR and loss severities are forecasted by management after full evaluation of the underlying collateral including recent performance statistics. Therefore, based upon management’s analysis and judgment, two non-agency residential mortgage-backed securities were other-than-temporarily impaired at June 30, 2016. The credit-related other-than-temporary impairment recognized in earnings for the second quarter of 2016 on these non-agency residential mortgage-backed securities, which are not expected to be sold, was $33. Non-credit related other-than-temporary impairment, net of deferred taxes, of $242 was recognized during the second quarter of 2016. 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). 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 2016, it was determined that none of the single issue securities were other-than-temporarily impaired. All single-issue trust preferred securities are currently receiving interest payments. The available for sale single issue trust preferred securities’ ratings ranged from a low of Ba1 to a high of BBB-. The amortized cost of available for sale single issue trust preferred securities as of June 30, 2016 consisted of $3,004 in investment grade bonds, $4,643 in split-rated bonds and $5,690 in unrated bonds. All of the unrated bonds were in an unrealized loss position for twelve months or longer as of June 30, 2016. Trust preferred collateralized debt obligations (Trup Cdos) In order to determine how and when the Company recognizes OTTI, 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, 2016, the Company has determined that it does not intend to sell any pooled trust preferred security 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. The Company discounts the security-specific cash flow projection at the security-specific interest rate and compares the present value to the amortized cost. Management’s cash flow analysis was performed for each security and considered the current deferrals and defaults within the underlying collateral, the likelihood that current deferrals would cure or ultimately default, potential future deferrals and defaults, potential prepayments, cash reserves, excess interest spread, credit analysis of the underlying collateral and the priority of payments in the cash flow structure. The underlying collateral analysis for each issuer took into consideration multiple factors including capital adequacy, earnings trends and asset quality. After completing its analysis of estimated cash flows, management determined that none of the Trup Cdos experienced an adverse change in cash flows during the second quarter of 2016, as the expected discounted cash flows from these particular securities were greater than or equal to the discounted cash flows originally expected at purchase or from the previous date of other-than-temporary impairment (cash flows are discounted at the contractual coupon rate for purposes of assessing OTTI). There was no credit-related other-than-temporary impairment recognized in earnings for the second quarter of 2016 related to these securities. The total credit-related other-than-temporary impairment recognized in earnings during 2015 related to these securities was $34. The balance of noncredit-related other-than-temporary impairment recognized on United’s Trup Cdo portfolio was $25,952 at June 30, 2016 and December 31, 2015. The amortized cost of available for sale Trup Cdos in an unrealized loss position for twelve months or longer as of June 30, 2016 consisted of $4,484 in investment grade bonds and $39,229 in below investment grade bonds. The following is a summary of the available for sale Trup Cdos as of June 30, 2016: Amortized Cost Class Amortized Cost Fair Value Unrealized Loss Investment Split Below Senior – Bank $ 6,625 $ 5,847 $ 778 $ 4,484 $ 0 $ 2,141 Mezzanine – Bank (now in senior position) 11,352 8,180 3,172 0 0 11,352 Mezzanine – Bank 26,091 14,736 11,355 0 0 26,091 Mezzanine – Bank & Insurance (combination) 5,207 3,246 1,961 0 0 5,207 Totals $ 49,275 $ 32,009 $ 17,266 $ 4,484 $ 0 $ 44,791 While a large difference remains between the fair value and amortized cost, the Company believes the remaining unrealized losses are related to the illiquid market for Trup Cdos rather than an adverse change in expected cash flows. The expected future cash flow substantiates the return of the remaining amortized cost of the security. The Company believes the following evidence supports the position that the remaining unrealized loss is related to the illiquid market for Trup Cdos: • The market for new issuance of Trup Cdos was robust from 2000 to 2007 with an estimated $60 billion in new issuance. The new market issuances came to an abrupt halt in 2007. • The secondary market for Trup Cdos ultimately became illiquid and although the market has improved, trading activity remains limited on these securities. In making this determination, the Company holds discussions with institutional traders to identify trends in the number and type of transactions related to the Trup Cdos. • The presence of a below-investment grade rating severely limits the pool of available buyers and contributes to the illiquidity of the market. • Trup Cdos have a more complex structure than most debt instruments, making projections of tranche returns difficult for non-specialists in the product. Deferral features available to the underlying issuers within each pool are unique to these securities. Additionally, it can be difficult for market participants to predict whether deferrals will ultimately cure or ultimately default. Due to the lack of transparency, market participants will require a higher risk premium, thus resulting in higher required discount rates. • The variability of cash flows at the time the securities were originated was expected to be very limited. Due to the financial crisis, Trup Cdos have experienced more substantive variability of cash flows compared to expectations, resulting in a higher risk premium when evaluating discount rates. • The limited, yet relevant, observable inputs indicate that market yield requirements for Trup Cdos, on a credit-adjusted basis, remained very high relative to discount rates at purchase and compared to other similarly rated debt securities. Management also considered the ratings of the Company’s bonds in its portfolio and the extent of downgrades in United’s impairment analysis. However, management considered it imperative to independently perform its own credit analysis based on cash flows as described. The ratings of the investment grade Trup Cdos in the table above range from a low of AA to a high of Aaa. The below investment grade Trup Cdos range from a low of C to a high of Ba1. On the Trup Cdos that have not been deemed to be other-than-temporarily impaired, the collateralization ratios range from a low of 104.0% to a high of 308.4%, with a median of 156.9%, and a weighted average of 212.7%. The collateralization ratio is defined as the current performing collateral in a security, divided by the current balance of the specific tranche the Company owns, plus any debt which is senior or pari passu with the Company’s security’s priority level. Performing collateral excludes the balance of any issuer that has either defaulted or has deferred its interest payment. It is not uncommon for the collateralization of a security that is not other-than-temporarily impaired to be less than 100% due to the excess spread built into the securitization structure. Except for the debt securities that have already been deemed to be other-than-temporarily impaired, management does not believe any other individual security with an unrealized loss as of June 30, 2016 is other-than-temporarily impaired. For these securities, United believes the decline in value resulted from changes in market interest rates, credit spreads and liquidity, not a change in the expected contractual cash flows. Based on a review of each of the securities in the investment portfolio, management concluded that it expected to recover the amortized cost basis of the investment in such securities. Equity securities The amortized cost of United’s equity securities was $5,890 at June 30, 2016. For equity securities, management has evaluated the near-term prospects of the investment in relation to the severity and duration of any impairment and based on that evaluation, management determined that no equity securities were other-than-temporarily impaired at June 30, 2016. Other investment securities (cost method) During the second quarter of 2016, United also evaluated all of its cost method investments to determine if certain events or changes in circumstances during the second quarter of 2016 had a significant adverse effect on the fair value of any of its cost method securities. United determined that there were no events or changes in circumstances during the first quarter which would have an adverse effect on the fair value of any of its cost method securities. Therefore, no impairment was recorded. 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 2016 2015 2016 2015 Balance of cumulative credit losses at beginning of period $ 23,773 $ 23,773 $ 23,773 $ 23,739 Additional credit losses on securities for which OTTI was previously recognized 33 0 33 34 Reductions during the period for securities for which the amount previously recognized in other comprehensive income was recognized in earnings (1,644 ) 0 (1,644 ) 0 Balance of cumulative credit losses at end of period $ 22,162 $ 23,773 $ 22,162 $ 23,773 The amortized cost and estimated fair value of securities available for sale at June 30, 2016 and December 31, 2015 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, 2016 December 31, 2015 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 98,087 $ 98,129 $ 10,448 $ 10,515 Due after one year through five years 296,081 302,838 273,469 274,158 Due after five years through ten years 212,521 222,195 213,274 216,636 Due after ten years 697,059 693,996 570,305 559,570 Marketable equity securities 5,890 6,551 4,844 5,455 Total $ 1,309,638 $ 1,323,709 $ 1,072,340 $ 1,066,334 The amortized cost and estimated fair values of securities held to maturity are summarized as follows: June 30, 2016 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 5,347 $ 792 $ 0 $ 6,139 State and political subdivisions 9,322 18 205 9,135 Residential mortgage-backed securities Agency 33 7 0 40 Single issue trust preferred securities 19,307 0 3,882 15,425 Other corporate securities 20 0 0 20 Total $ 34,029 $ 817 $ 4,087 $ 30,759 December 31, 2015 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 10,425 $ 860 $ 0 $ 11,285 State and political subdivisions 9,321 21 253 9,089 Residential mortgage-backed securities Agency 35 6 0 41 Single issue trust preferred securities 19,298 0 3,414 15,884 Other corporate securities 20 0 0 20 Total $ 39,099 $ 887 $ 3,667 $ 36,319 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. As of June 30, 2016, the Company’s two largest held-to-maturity single-issue trust preferred exposures were to Wells Fargo ($9,919) and SunTrust Bank ($7,413). The two held-to-maturity single-issue trust preferred exposures with at least one rating below investment grade included SunTrust Bank ($7,413) and Royal Bank of Scotland ($975). Other corporate securities consist mainly of bonds of corporations. 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 2016 and 2015. The amortized cost and estimated fair value of debt securities held to maturity at June 30, 2016 and December 31, 2015 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, 2016 December 31, 2015 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 1,000 $ 1,000 $ 5,029 $ 5,121 Due after one year through five years 8,624 9,432 9,672 10,458 Due after five years through ten years 4,045 3,843 4,045 3,794 Due after ten years 20,360 16,484 20,353 16,946 Total $ 34,029 $ 30,759 $ 39,099 $ 36,319 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 $1,243,648 and $986,982 at June 30, 2016 and December 31, 2015, respectively.

Loans

Loans	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Loans	4. LOANS Major classes of loans are as follows: June 30, 2016 December 31, Commercial, financial and agricultural: Owner-occupied commercial real estate $ 877,393 $ 927,746 Nonowner-occupied commercial real estate 3,675,865 2,896,367 Other commercial loans 1,684,008 1,602,222 Total commercial, financial & agricultural 6,237,266 5,426,335 Residential real estate 2,403,466 2,268,685 Construction & land development 1,285,171 1,273,054 Consumer: Bankcard 12,074 11,653 Other consumer 499,377 419,225 Total gross loans $ 10,437,354 $ 9,398,952 The table above does not include loans held for sale of $6,226 and $10,681 at June 30, 2016 and December 31, 2015, 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 $111,137 or 1.06% of total gross loans at June 30, 2016 and $148,197 or 1.58% of total gross loans at December 31, 2015. The contractual principal in these previously acquired impaired loans was $160,108 and $208,765 at June 30, 2016 and December 31, 2015, respectively. The impaired loan balances above do not include any impaired loans acquired from Bank of Georgetown, which are yet to be determined, or future accretable net interest (i.e. the difference between the undiscounted expected cash flows and the recorded investment in the loan) on the previously acquired impaired loans. Activity for the accretable yield for the first six months of 2016 follows: Accretable yield at the beginning of the period $ 12,156 Accretion (including cash recoveries) (4,636 ) Net reclassifications to accretable from non-accretable 2,530 Disposals (including maturities, foreclosures, and charge-offs) (1,712 ) Accretable yield at the end of the period $ 8,338 United’s subsidiary banks have made loans to the directors and officers of United and its subsidiaries, and to their affiliates. The aggregate dollar amount of these loans was $288,913 and 241,000 at June 30, 2016 and December 31, 2015, respectively.

Credit Quality

Credit Quality	6 Months Ended
	Jun. 30, 2016
Text Block [Abstract]
Credit Quality	5. CREDIT QUALITY Management monitors the credit quality of its loans on an ongoing basis. Measurement of delinquency and past due status are based on the contractual terms of each loan. 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, 2016, United had TDRs of $24,944 as compared to $23,890 as of December 31, 2015. Of the $24,944 aggregate balance of TDRs at June 30, 2016, $10,682 was on nonaccrual status and included in the “Loans on Nonaccrual Status” on the following page. Of the $23,890 aggregate balance of TDRs at December 31, 2015, $11,949 was on nonaccrual status and included in the “Loans on Nonaccrual Status” on the following page. As of June 30, 2016, there were no commitments to lend additional funds to debtors owing receivables whose terms have been modified in TDRs. At June 30, 2016, United had restructured loans in the amount of $2,721 that were modified by a reduction in the interest rate, $8,755 that were modified by a combination of a reduction in the interest rate and the principal and $13,468 that was modified by a change in terms. A loan acquired and accounted for under ASC topic 310-30 “Loans and Debt Securities Acquired with Deteriorated Credit Quality” is reported as an accruing loan and a performing asset. The following table sets forth United’s troubled debt restructurings that have been restructured during the three months ended June 30, 2016 and 2015, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2016 June 30, 2015 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate: Owner-occupied 1 $ 1,190 $ 1,188 0 $ 0 $ 0 Nonowner-occupied 0 0 0 1 669 669 Other commercial 1 700 700 0 0 0 Residential real estate 0 0 0 0 0 0 Construction & land development 0 0 0 0 0 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total 2 $ 1,890 $ 1,888 1 $ 669 $ 669 The following table sets forth United’s troubled debt restructurings that have been restructured during the six months ended June 30, 2016 and 2015, segregated by class of loans: Troubled Debt Restructurings For the Six Months Ended June 30, 2016 June 30, 2015 Number of Pre- Modification Post- Modification Number of Pre- Modification Post- Modification Commercial real estate: Owner-occupied 1 $ 1,190 $ 1,188 0 $ 0 $ 0 Nonowner-occupied 0 0 0 1 669 669 Other commercial 4 2,141 2,134 1 240 240 Residential real estate 1 1,400 1,400 0 0 0 Construction & land development 0 0 0 0 0 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total 6 $ 4,731 $ 4,722 2 $ 909 $ 909 During the second quarter and first six months of 2016, $1,888 and $3,322, respectively, of restructured loans were modified by a change in loan terms. In addition, during the first six months of 2016, $1,400 of restructured loans were modified by a combination of a reduction in the interest rate and an extension of the maturity date. During the second quarter and first six months of 2015, $669 and $909, respectively, of restructured loans were modified by a combination of a reduction in the interest rate and an extension of the maturity date. In some instances, the post-modification balance on the restructured loans is larger than the pre-modification balance due to the advancement of monies for items such as delinquent taxes on real estate property. The loans were evaluated individually for allocation within United’s allowance for loan losses. The modifications had an immaterial impact on the financial condition and results of operations for United. No loans restructured during the twelve-month periods ended June 30, 2016 and 2015 subsequently defaulted, resulting in a principal charge-off during the first six months of 2016 and 2015, respectively. 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, 2016 30-89 90 Days Total Past Current & Total Financing Recorded & Accruing Commercial real estate: Owner-occupied $ 8,422 $ 8,828 $ 17,250 $ 860,143 $ 877,393 $ 0 Nonowner-occupied 10,699 17,688 28,387 3,647,478 3,675,865 0 Other commercial 11,090 36,202 47,292 1,636,716 1,684,008 699 Residential real estate 32,796 23,018 55,814 2,347,652 2,403,466 3,463 Construction & land development 9,191 11,433 20,624 1,264,547 1,285,171 37 Consumer: Bankcard 331 103 434 11,640 12,074 103 Other consumer 8,660 1,513 10,173 489,204 499,377 1,292 Total $ 81,189 $ 98,785 $ 179,974 $ 10,257,380 $ 10,437,354 $ 5,594 (1) Other includes loans with a recorded investment of $111,137 acquired and accounted for under ASC topic 310-30 “Loans and Debt Securities Acquired with Deteriorated Credit Quality”. Age Analysis of Past Due Loans As of December 31, 2015 30-89 90 Days or more Total Past Current & Total Financing Recorded & Accruing Commercial real estate: Owner-occupied $ 8,639 $ 9,831 $ 18,470 $ 909,276 $ 927,746 $ 400 Nonowner-occupied 24,209 26,126 50,335 2,846,032 2,896,367 552 Other commercial 14,888 33,297 48,185 1,554,037 1,602,222 3,643 Residential real estate 44,312 28,332 72,644 2,196,041 2,268,685 4,294 Construction & land development 2,412 15,416 17,828 1,255,226 1,273,054 1,347 Consumer: Bankcard 223 168 391 11,262 11,653 168 Other consumer 9,082 1,596 10,678 408,547 419,225 1,224 Total $ 103,765 $ 114,766 $ 218,531 $ 9,180,421 $ 9,398,952 $ 11,628 (1) Other includes loans with a recorded investment of $148,197 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, 2016 December 31, 2015 Commercial real estate: Owner-occupied $ 8,828 $ 9,431 Nonowner-occupied 17,688 25,574 Other commercial 35,503 29,654 Residential real estate 19,555 24,038 Construction & land development 11,396 14,069 Consumer: Bankcard 0 0 Other consumer 221 372 Total $ 93,191 $ 103,138 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 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, 2016 Commercial Real Estate Construction Owner- occupied Nonowner- occupied Other Commercial & Land Development Grade: Pass $ 760,312 $ 3,522,786 $ 1,538,941 $ 1,127,373 Special mention 38,739 31,690 26,435 55,444 Substandard 78,342 121,389 115,922 102,234 Doubtful 0 0 2,710 120 Total $ 877,393 $ 3,675,865 $ 1,684,008 $ 1,285,171 As of December 31, 2015 Commercial Real Estate Construction Owner- occupied Nonowner- occupied Other Commercial & Land Development Grade: Pass $ 835,082 $ 2,710,504 $ 1,436,670 $ 1,095,238 Special mention 20,391 32,249 26,148 59,100 Substandard 72,273 153,614 136,585 118,716 Doubtful 0 0 2,819 0 Total $ 927,746 $ 2,896,367 $ 1,602,222 $ 1,273,054 Credit Quality Indicators Consumer Credit Exposure As of June 30, 2016 Residential Real Estate Bankcard Other Consumer Grade: Pass $ 2,336,352 $ 11,640 $ 488,943 Special mention 20,667 331 8,769 Substandard 46,008 103 1,665 Doubtful 439 0 0 Total $ 2,403,466 $ 12,074 $ 499,377 As of December 31, 2015 Residential Real Estate Bankcard Other Consumer Grade: Pass $ 2,195,420 $ 11,262 $ 408,271 Special mention 13,494 223 9,188 Substandard 57,981 168 1,766 Doubtful 1,790 0 0 Total $ 2,268,685 $ 11,653 $ 419,225 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, 2016 December 31, 2015 Recorded Unpaid Related Recorded Unpaid Related With no related allowance recorded: Commercial real estate: Owner-occupied $ 26,557 $ 27,090 $ 0 $ 36,615 $ 36,828 $ 0 Nonowner-occupied 59,080 59,575 0 69,053 69,517 0 Other commercial 22,654 24,889 0 30,433 32,158 0 Residential real estate 27,833 29,420 0 21,431 22,329 0 Construction & land development 21,891 24,105 0 28,245 29,953 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 39 39 0 32 32 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,915 $ 4,915 $ 1,712 $ 4,555 $ 4,555 $ 1,253 Nonowner-occupied 10,800 10,800 1,716 7,890 7,890 1,362 Other commercial 35,486 36,786 16,617 29,486 33,127 18,269 Residential real estate 4,034 4,769 898 13,305 14,625 2,118 Construction & land development 11,273 14,331 4,939 14,132 20,135 4,789 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 31,472 $ 32,005 $ 1,712 $ 41,170 $ 41,383 $ 1,253 Nonowner-occupied 69,880 70,375 1,716 76,943 77,407 1,362 Other commercial 58,140 61,675 16,617 59,919 65,285 18,269 Residential real estate 31,867 34,189 898 34,736 36,954 2,118 Construction & land development 33,164 38,436 4,939 42,377 50,088 4,789 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 39 39 0 32 32 0 Impaired Loans For the Three Months Ended June 30, 2016 June 30, 2015 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 27,267 $ 125 $ 43,898 $ 117 Nonowner-occupied 62,049 186 66,936 354 Other commercial 25,816 124 35,659 140 Residential real estate 28,074 97 30,867 97 Construction & land development 22,838 40 36,722 80 Consumer: Bankcard 0 0 0 0 Other consumer 33 0 35 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,552 $ 30 $ 4,789 $ 20 Nonowner-occupied 8,615 195 6,847 7 Other commercial 37,584 98 19,764 154 Residential real estate 8,174 19 7,119 18 Construction & land development 11,919 48 10,740 58 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 31,819 $ 155 $ 48,687 $ 137 Nonowner-occupied 70,664 381 73,783 361 Other commercial 63,400 222 55,423 294 Residential real estate 36,248 116 37,986 115 Construction & land development 34,757 88 47,462 138 Consumer: Bankcard 0 0 0 0 Other consumer 33 0 35 0 Impaired Loans For the Six Months Ended June 30, 2016 June 30, 2015 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 33,221 $ 184 $ 40,294 $ 179 Nonowner-occupied 66,395 393 61,290 517 Other commercial 27,861 224 32,580 240 Residential real estate 26,872 237 31,912 146 Construction & land development 25,916 67 45,541 159 Consumer: Bankcard 0 0 0 0 Other consumer 34 0 40 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,564 $ 57 $ 4,936 $ 58 Nonowner-occupied 8,507 238 7,112 46 Other commercial 34,134 228 19,083 218 Residential real estate 9,339 25 6,692 29 Construction & land development 12,994 90 10,833 92 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 37,785 $ 241 $ 45,230 $ 237 Nonowner-occupied 74,902 631 68,402 563 Other commercial 61,995 452 51,663 458 Residential real estate 36,211 262 38,604 175 Construction & land development 38,910 157 56,374 251 Consumer: Bankcard 0 0 0 0 Other consumer 34 0 40 0 At June 30, 2016 and December 31, 2015, other real estate owned (OREO) included in other assets in the Consolidated Balance Sheets was $34,894 and $32,228, 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, 2016 and December 31, 2015, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $180 and $234, respectively.

Allowance for Credit Losses

Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Allowance for Credit Losses	6. ALLOWANCE FOR CREDIT LOSSES The allowance for loan losses is management’s estimate of the probable credit losses inherent in the loan portfolio. Management’s evaluation of the adequacy of the allowance for loan losses and the appropriate provision for credit losses is based upon a quarterly evaluation of the portfolio. This evaluation is inherently subjective and requires significant estimates, including the amounts and timing of estimated future cash flows, estimated losses on pools of loans based on historical loss experience, and consideration of current economic trends, all of which are susceptible to constant and significant change. The amounts allocated to specific credits and loan pools grouped by similar risk characteristics are reviewed on a quarterly basis and adjusted as necessary based upon subsequent changes in circumstances. In determining the components of the allowance for credit losses, management considers the risk arising in part from, but not limited to, charge-off and delinquency trends, current economic and business conditions, lending policies and procedures, the size and risk characteristics of the loan portfolio, concentrations of credit, and other various factors. Loans deemed to be uncollectible are charged against the allowance for loan losses, while recoveries of previously charged-off amounts are credited to the allowance for loan losses. For purposes of determining the general allowance, the loan portfolio is segregated by loan product type to recognize differing risk profiles among loan categories. It is further segregated by credit grade for risk-rated loan pools and delinquency for homogeneous loan pools. The outstanding principal balance within each pool is multiplied by historical loss data and certain qualitative factors to derive the general loss allocation per pool. Specific loss allocations are calculated for loans in excess of $500 thousand in accordance with ASC topic 310. Risk characteristics of owner-occupied commercial real estate loans and other commercial loans are similar in that they are normally dependent upon the borrower’s internal cash flow from operations to service debt. Nonowner-occupied commercial real estate loans differ in that cash flow to service debt is normally dependent on external income from third parties for use of the real estate such as rents, leases and room rates. Residential real estate loans are dependent upon individual borrowers who are affected by changes in general economic conditions, demand for housing and resulting residential real estate valuation. Construction and land development loans are impacted mainly by demand whether for new residential housing or for retail, industrial, office and other types of commercial construction within a given area. Consumer loan pool risk characteristics are influenced by general, regional and local economic conditions. During the first six months of 2016, there were no material changes to the accounting policy or methodology related to the allowance for loan losses. Loans deemed to be uncollectible are charged against the allowance for loan losses, while recoveries of previously charged-off amounts are credited to the allowance for loan losses. For commercial loans, when a loan or a portion of a loan is identified to contain a loss, a charge-off recommendation is directed to management to charge-off all or a portion of that loan. Generally, any unsecured commercial loan more than six months delinquent in payment of interest must be charged-off in full. If secured, the charge-off is generally made to reduce the loan balance to a level equal to the liquidation value of the collateral when payment of principal and interest is six months delinquent. Any commercial loan, secured or unsecured, on which a principal or interest payment has not been made within 90 days, is reviewed monthly for appropriate action. For consumer loans, closed-end retail loans that are past due 120 cumulative days delinquent from the contractual due date and open-end loans 180 cumulative days delinquent from the contractual due date are charged-off. Any consumer loan on which a principal or interest payment has not been made within 90 days is reviewed monthly for appropriate action. For a one-to-four family open-end or closed-end residential real estate loan, home equity loan, or high-loan-to-value loan that has reached 180 or more days past due, management evaluates the collateral position and charge-offs any amount that exceeds the value of the collateral. On retail credits for which the borrower is in bankruptcy, all amounts deemed unrecoverable are charged off within 60 days of the receipt of the notification. On retail credits effected by fraud, a loan is charged-off within 90 days of the discovery of the fraud. In the event of the borrower’s death and if repayment within the required timeframe is uncertain, the loan is generally charged-off as soon as the amount of the loss is determined. 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, 2016, the re-estimation of the expected cash flows related to loans acquired that have evidence of deterioration of credit quality resulted in provision for loan losses expense of $1,728 and $1,290, respectively, as compared to provision for loan losses expense of $668 and $4,032, respectively, for the three and six months ended June 30, 2015. 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 $1,394 and $936 at June 30, 2016 and December 31, 2015, 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, 2016 Commercial Real Estate Other Residential Construction Consumer Allowance for Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 5,348 $ 6,201 $ 32,640 $ 13,547 $ 15,266 $ 2,273 $ 215 $ 75,490 Charge-offs 1,328 45 7,364 1,136 1,429 685 0 11,987 Recoveries 588 122 29 236 195 108 0 1,278 Provision 2,346 449 5,052 (542 ) (642 ) 861 143 7,667 Ending balance $ 6,954 $ 6,727 $ 30,357 $ 12,105 $ 13,390 $ 2,557 $ 358 $ 72,448 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2016 Commercial Real Estate Other Residential Construction Consumer Allowance for Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 3,637 $ 5,309 $ 31,328 $ 15,148 $ 18,205 $ 1,995 $ 104 $ 75,726 Charge-offs 2,673 408 11,118 1,845 1,429 1,460 0 18,933 Recoveries 1,369 626 1,009 447 254 248 0 3,953 Provision 4,621 1,200 9,138 (1,645 ) (3,640 ) 1,774 254 11,702 Ending balance $ 6,954 $ 6,727 $ 30,357 $ 12,105 $ 13,390 $ 2,557 $ 358 $ 72,448 Ending Balance: individually evaluated for impairment $ 1,712 $ 1,716 $ 16,617 $ 898 $ 4,939 $ 0 $ 0 $ 25,882 Ending Balance: collectively evaluated for impairment $ 5,242 $ 5,011 $ 13,740 $ 11,207 $ 8,451 $ 2,557 $ 358 $ 46,566 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 877,394 $ 3,675,864 $ 1,684,008 $ 2,403,466 $ 1,285,171 $ 511,451 $ 0 $ 10,437,354 Ending Balance: individually evaluated for impairment $ 15,034 $ 19,648 $ 44,388 $ 14,845 $ 13,822 $ 0 $ 0 $ 107,737 Ending Balance: collectively evaluated for impairment $ 848,843 $ 3,611,531 $ 1,625,065 $ 2,377,034 $ 1,244,595 $ 511,412 $ 0 $ 10,218,480 Ending Balance: loans acquired with deteriorated credit quality $ 13,517 $ 44,685 $ 14,555 $ 11,587 $ 26,754 $ 39 $ 0 $ 111,137 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2015 Commercial Real Estate Construction Allowance Owner- Nonowner- Other Residential & Land Consumer Estimated Total Allowance for Loan Losses: Beginning balance $ 4,041 $ 8,167 $ 26,931 $ 13,835 $ 19,402 $ 3,083 $ 70 $ 75,529 Charge-offs (4,755 ) (1,120 ) (10,042 ) (6,411 ) (862 ) (2,309 ) (0 ) (25,499 ) Recoveries 829 74 714 495 511 499 0 3,122 Provision 3,522 (1,812 ) 13,725 7,229 (846 ) 722 34 22,574 Ending balance $ 3,637 $ 5,309 $ 31,328 $ 15,148 $ 18,205 $ 1,995 $ 104 $ 75,726 Ending Balance: individually evaluated for impairment $ 1,253 $ 1,362 $ 18,269 $ 2,119 $ 4,789 $ 0 $ 0 $ 27,792 Ending Balance: collectively evaluated for impairment $ 2,384 $ 3,947 $ 13,059 $ 13,029 $ 13,416 $ 1,995 $ 104 $ 47,934 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 927,746 $ 2,896,367 $ 1,602,222 $ 2,268,685 $ 1,273,054 $ 430,878 $ 0 $ 9,398,952 Ending Balance: individually evaluated for impairment $ 12,670 $ 26,152 $ 35,342 $ 17,782 $ 15,779 $ 0 $ 0 $ 107,725 Ending Balance: collectively evaluated for impairment $ 888,802 $ 2,817,748 $ 1,546,018 $ 2,237,865 $ 1,221,760 $ 430,837 $ 0 $ 9,143,030 Ending Balance: loans acquired with deteriorated credit quality $ 26,274 $ 52,467 $ 20,862 $ 13,038 $ 35,515 $ 41 $ 0 $ 148,197

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	7. INTANGIBLE ASSETS The following is a summary of intangible assets subject to amortization and those not subject to amortization: As of June 30, 2016 Gross Carrying Accumulated Net Carrying Amortized intangible assets: Core deposit intangible assets $ 71,983 ($ 44,400 ) $ 27,583 Goodwill not subject to amortization $ 866,176 As of December 31, 2015 Gross Carrying Accumulated Net Carrying Amortized intangible assets: Core deposit intangible assets $ 60,577 ($ 42,737 ) $ 17,840 Goodwill not subject to amortization $ 710,252 The following table provides a reconciliation of goodwill: Goodwill at December 31, 2015 $ 710,252 Preliminary addition to goodwill from Bank of Georgetown acquisition 155,924 Goodwill at June 30, 2016 $ 866,176 United incurred amortization expense on intangible assets of $919 and $1,664 for the quarter and six months ended June 30, 2016, respectively, and $855 and $1,710 for the quarter and six months ended June 30, 2015, respectively. The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2015: Year Amount 2016 $ 4,193 2017 4,559 2018 4,000 2019 3,703 2020 and thereafter 12,791

Short-Term Borrowings

Short-Term Borrowings	6 Months Ended
	Jun. 30, 2016
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 $264,000. These lines of credit, which bear interest at prevailing market rates, permit United to borrow funds in the overnight market, and are renewable subject to certain conditions. At June 30, 2016, federal funds purchased were $8,300 while securities sold under agreements to repurchase (REPOs) were $377,146. Included in the $377,146 of total REPOs were wholesale REPOs of $50,123, including purchase accounting amounts, assumed in the Virginia Commerce merger. These wholesale REPOs are scheduled to mature in May of 2018. The securities sold under agreements to repurchase were accounted for as collateralized financial transactions. They were recorded at the amounts at which the securities were acquired or sold plus accrued interest. United has a $20,000 line of credit with an unrelated financial institution to provide for general liquidity needs. The line is an unsecured, revolving line of credit. The line will be renewable on a 360-day basis and will carry an indexed, floating-rate of interest. The line requires compliance with various financial and nonfinancial covenants. At June 30, 2016, United had no outstanding balance under this line of credit.

Long-Term Borrowings

Long-Term Borrowings	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Long-Term Borrowings	9. LONG-TERM BORROWINGS United’s subsidiary banks are members 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, 2016, United had an unused borrowing amount of approximately $1,947,887 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, 2016, $1,295,829 of FHLB advances with a weighted-average interest rate of 0.59% are scheduled to mature within the next nine years. Overnight funds of $400,000 with an interest rate of 0.48% are included in the $1,295,829 above at June 30, 2016. The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2016 $ 995,589 2017 230,240 2018 10,000 2019 35,000 2020 and thereafter 25,000 Total $ 1,295,829 At June 30, 2016, United had a total of thirteen 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, 2016 and December 31, 2015, the outstanding balance of the Debentures was $223,940 and $223,506, 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. In July of 2013, United’s primary federal regulator, the Federal Reserve, published final rules (the “Basel III Capital Rules”) establishing a new comprehensive capital framework for U.S. banking organizations which were effective for United on January 1, 2015. The Basel III Capital Rules permit bank holding companies such as United with less than $15 billion in total consolidated assets as of December 31, 2009 to include in additional Tier 1 Capital trust preferred securities and cumulative perpetual preferred stock issued and included in Tier 1 Capital prior to May 19, 2010 on a permanent basis, without any phase-out. However, United’s Trust Preferred Securities are subject to a limit of 25 percent of Tier 1 capital elements excluding any non-qualifying capital instruments and after all regulatory capital deductions and adjustments applied to Tier 1 capital. Trust Preferred Securities no longer included in United’s Tier 1 capital may be included as a component of Tier 2 capital on a permanent basis without phase-out. As of June 30, 2016, all of United’s Trust Preferred Securities qualify as Tier 1 Capital.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	6 Months Ended
	Jun. 30, 2016
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 risk in the normal course of business to meet the financing needs of its customers and to alter its own exposure to fluctuations in interest rates. These financial instruments include loan commitments, standby letters of credit, and interest rate swap agreements. The instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. 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 sheet instruments. Collateral may be obtained, if deemed necessary, based on management’s credit evaluation of the counterparty. 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 $2,596,914 and $2,587,957 of loan commitments outstanding as of June 30, 2016 and December 31, 2015, respectively, approximately half of which expire within one year. 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, 2016 and December 31, 2015, United had $11 and $226, respectively, of outstanding commercial letters of credit. A standby letter of credit is generally contingent upon the failure of a customer to perform according to the terms of an underlying contract with a third party. United has issued standby letters of credit $122,597 and $135,146 as of June 30, 2016 and December 31, 2015, respectively. In accordance with the Contingencies Topic of the FASB Accounting Standards Codification, United has determined that substantially all of its letters of credit are renewed on an annual basis and the fees associated with these letters of credit are immaterial. 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, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	11. DERIVATIVE FINANCIAL INSTRUMENTS United uses derivative instruments to help manage adverse prices 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 the Derivatives and Hedging topic of the FASB Accounting Standards Codification. The Derivatives and Hedging topic require 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. As of June 30, 2016, United has only fair value hedges. For a fair value hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to the hedged financial instrument. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a fair value hedge are offset in current period earnings. For a cash flow hedge, the fair value of the interest rate swap is recognized on the balance sheet as either a freestanding asset or liability with a corresponding adjustment to other comprehensive income within shareholders’ equity, net of tax. Subsequent adjustments due to changes in the fair value of a derivative that qualifies as a cash flow hedge are offset to other comprehensive income, net of tax. The portion of a hedge that is ineffective is recognized immediately in earnings. 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. 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 table sets forth certain information regarding the interest rate derivatives portfolio used for interest-rate risk management purposes and designated as accounting hedges under the Derivatives and Hedging topic at June 30, 2016. Derivative Classifications and Hedging Relationships June 30, 2016 Notional Amount Average Pay Rate Fair Value Hedges: Pay Fixed Swaps (Hedging Commercial Loans) $ 96,500 3.64 % Total Derivatives Used in Fair Value Hedges $ 96,500 Total Derivatives Used for Interest Rate Risk Management and Designated as Hedges $ 96,500 The following tables summarize the fair value of United’s derivative financial instruments. Asset Derivatives June 30, 2016 December 31, 2015 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other assets $ 0 Other assets $ 0 Total derivatives designated as hedging instruments $ 0 $ 0 Derivatives not designated as hedging instruments Interest rate contracts Other assets $ 2,515 Other assets $ 2,942 Total derivatives not designated as hedging instruments $ 2,515 $ 2,942 Total asset derivatives $ 2,515 $ 2,942 Liability Derivatives June 30, 2016 December 31, 2015 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other liabilities $ 7,458 Other liabilities $ 1,179 Total derivatives designated as hedging instruments $ 7,458 $ 1,179 Derivatives not designated as hedging instruments Interest rate contracts Other liabilities $ 2,515 Other liabilities $ 2,942 Total derivatives not designated as hedging instruments $ 2,515 $ 2,942 Total liability derivatives $ 9,973 $ 4,121 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, 2016 and 2015 are presented as follows: Income Statement Location Three Months Ended June 30, June 30, Derivatives in fair value hedging relationships Interest rate contracts Interest income/ (expense) $ (249 ) $ 96 Total derivatives in fair value hedging relationships $ (249 ) $ 96 Derivatives not designated as hedging instruments Interest rate contracts (1) Other income $ 0 $ 0 Total derivatives not designated as hedging instruments $ 0 $ 0 Total derivatives $ (249 ) $ 96 Income Statement Location Six Months Ended June 30, June 30, Derivatives in fair value hedging relationships Interest rate contracts Interest income/ (expense) $ 32 $ (328 ) Total derivatives in fair value hedging relationships $ 32 $ (328 ) Derivatives not designated as hedging instruments Interest rate contracts (1) Other income $ 0 $ 0 Total derivatives not designated as hedging instruments $ 0 $ 0 Total derivatives $ 32 $ (328 ) (1) Represents net gains from derivative assets not designated as hedging instruments.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	12. FAIR VALUE MEASUREMENTS United determines the fair values of its financial instruments based on the fair value hierarchy established by ASC topic 820, which also clarifies that fair value of certain assets and liabilities is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The Fair Value Measurements and Disclosures topic specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect United’s market assumptions. The three levels of the fair value hierarchy, based on these two types of inputs, are as follows: Level 1 - Valuation is based on quoted prices in active markets for identical assets and liabilities. Level 2 - Valuation is based on observable inputs including quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets and liabilities in less active markets, and model-based valuation techniques for which significant assumptions can be derived primarily from or corroborated by observable data in the market. Level 3 - Valuation is based on prices, inputs and model-based techniques that use one or more significant inputs or assumptions that are unobservable in the market. When determining the fair value measurements for assets and liabilities, United looks to active and observable markets to price identical assets or liabilities whenever possible and classifies such items in Level 1. When identical assets and liabilities are not traded in active markets, United looks to market observable data for similar assets and liabilities and classifies such items as Level 2. Nevertheless, certain assets and liabilities are not actively traded in observable markets and United must use alternative valuation techniques using unobservable inputs to determine a fair value and classifies such items as Level 3. For assets and liabilities that are not actively traded, the fair value measurement is based primarily upon estimates that require significant judgment. Therefore, the results may not be realized in an actual sale or immediate settlement of the asset or liability. Additionally, there are inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results of current or future values. The level within the fair value hierarchy is based on the lowest level of input that is significant in the fair value measurement. In accordance with ASC topic 820, the following describes the valuation techniques used by United to measure certain financial assets and liabilities recorded at fair value on a recurring basis in the financial statements: Securities available for sale 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. 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 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, 2016 and December 31, 2015, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2016 Using Description Balance as of June 30, 2016 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 $ 153,576 $ 0 $ 153,576 $ 0 State and political subdivisions 170,793 0 170,793 0 Residential mortgage-backed securities Agency 615,741 0 615,741 0 Non-agency 7,808 0 7,808 0 Asset-backed securities 1,830 0 1,830 0 Commercial mortgage-backed securities Agency 309,056 0 309,056 0 Trust preferred collateralized debt obligations 32,009 0 0 32,009 Single issue trust preferred securities 11,258 0 11,258 0 Other corporate securities 15,087 0 15,087 0 Total available for sale debt securities 1,317,158 0 1,285,149 32,009 Available for sale equity securities: Financial services industry 3,652 817 2,835 0 Equity mutual funds (1) 1,735 1,735 0 0 Other equity securities 1,164 1,164 0 0 Total available for sale equity securities 6,551 3,716 2,835 0 Total available for sale securities 1,323,709 3,716 1,287,984 32,009 Derivative financial assets: Interest rate contracts 2,515 0 2,515 0 Liabilities Derivative financial liabilities: Interest rate contracts 9,973 0 9,973 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, 2015 Using Description Balance as of December 31, 2015 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 $ 73,786 $ 0 $ 73,786 $ 0 State and political subdivisions 133,778 0 133,778 0 Residential mortgage-backed securities Agency 477,982 0 477,982 0 Non-agency 9,571 0 9,571 0 Asset-backed securities 3,399 0 3,399 0 Commercial mortgage-backed securities Agency 305,935 0 305,935 0 Fair Value at December 31, 2015 Using Description Balance as of December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Trust preferred collateralized debt obligations 34,686 0 0 34,686 Single issue trust preferred securities 11,693 0 11,693 0 Other corporate securities 10,049 0 10,049 0 Total available for sale debt securities 1,060,879 0 1,026,193 34,686 Available for sale equity securities: Financial services industry 2,723 800 1,923 0 Equity mutual funds (1) 1,596 1,596 0 0 Other equity securities 1,136 1,136 0 0 Total available for sale equity securities 5,455 3,532 1,923 0 Total available for sale securities 1,066,334 3,532 1,028,116 34,686 Derivative financial assets: Interest rate contracts 2,942 0 2,942 0 Liabilities Derivative financial liabilities: Interest rate contracts 4,121 0 4,121 0 (1) The equity mutual funds are within a rabbi trust for the payment of benefits under a deferred compensation plan for certain key officers of United and its subsidiaries. There were no transfers between Level 1 and Level 2 for financial assets and liabilities measured at fair value on a recurring basis during the six months ended June 30, 2016 and the year ended December 31, 2015. The following table presents additional information about financial assets and liabilities measured at fair value at June 30, 2016 and December 31, 2015 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, 2016 December 31, Balance, beginning of period $ 34,686 $ 39,558 Total gains or losses (realized/unrealized): Included in earnings (or changes in net assets) 0 (34 ) Included in other comprehensive income (2,677 ) (4,838 ) Purchases, issuances, and settlements 0 0 Transfers in and/or out of Level 3 0 0 Balance, end of period $ 32,009 $ 34,686 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. The following describes the valuation techniques used by United to measure certain financial assets recorded at fair value on a non-recurring basis in the financial statements. Loans held for sale Impaired Loans OREO Intangible Assets: The following table summarizes United’s financial assets that were measured at fair value on a nonrecurring basis during the period: Description Balance as of June 30, 2016 Carrying value at June 30, 2016 YTD Losses Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Impaired Loans $ 66,508 $ 0 $ 20,003 $ 46,505 $ 3,915 OREO 34,894 0 34,628 266 1,865 Carrying value at December 31, 2015 Description Balance as of December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD Losses Assets Impaired Loans $ 69,368 $ 0 $ 29,186 $ 40,182 $ 8,485 OREO 32,228 0 32,228 0 1,141 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: Deposits: Short-term Borrowings: Long-term Borrowings: The estimated fair values of United’s financial instruments are summarized below: Fair Value Measurements Carrying Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) June 30, 2016 Cash and cash equivalents $ 1,101,469 $ 1,101,469 $ 0 $ 1,101,469 $ 0 Securities available for sale 1,323,709 1,323,709 3,716 1,287,984 32,009 Securities held to maturity 34,029 30,759 0 27,739 3,020 Other securities 125,413 119,143 0 0 119,143 Loans held for sale 6,226 6,226 0 6,226 0 Loans 10,350,410 10,410,066 0 0 10,410,066 Derivative financial assets 2,515 2,515 0 2,515 0 Deposits 10,315,853 10,300,805 0 10,300,805 0 Short-term borrowings 735,323 735,323 0 735,323 0 Long-term borrowings 1,169,892 1,141,151 0 1,141,151 0 Derivative financial liabilities 9,973 9,973 0 9,973 0 December 31, 2015 Cash and cash equivalents $ 857,335 $ 857,335 $ 0 $ 857,335 $ 0 Securities available for sale 1,066,334 1,066,334 3,532 1,028,116 34,686 Securities held to maturity 39,099 36,320 0 33,300 3,020 Other securities 98,749 93,811 0 0 93,811 Loans held for sale 10,681 10,681 0 10,681 0 Loans 9,308,354 9,289,463 0 0 9,289,463 Derivative financial assets 2,942 2,942 0 2,942 0 Deposits 9,341,527 9,332,451 0 9,332,451 0 Short-term borrowings 423,028 423,028 0 423,028 0 Long-term borrowings 1,015,249 988,270 0 988,270 0 Derivative financial liabilities 4,121 4,121 0 4,121 0

Stock Based Compensation

Stock Based Compensation	6 Months Ended
	Jun. 30, 2016
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 stock options or incentive stock options, stock appreciation rights (SARs), restricted stock, restricted stock units, performance units or other-stock-based award. These awards all relate to the common stock of United. The maximum number of shares of United common stock which may be issued under the 2016 LTI Plan is 1,700,000. The 2016 LTI Plan will be administered by a board committee appointed by United’s Board of Directors (the Board). Unless otherwise determined by the Board, the Compensation Committee of the Board (the Committee) shall administer the 2016 LTI Plan. Any and all shares may be issued in respect of any of the types of Awards, provided that (1) 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 500,000, and (2) the aggregate number of shares that may be issued pursuant to stock options is 1,200,000. The shares to be offered under the 2016 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 100,000. 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 10,000. 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 50,000 shares to any individual key employee and 5,000 shares to any individual non-employee director. Subject to certain change in control provisions, the 2016 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 29, 2016 with the Securities and Exchange Commission to register all the shares which were available for the 2016 LTI Plan. The 2016 LTI Plan replaces the 2011 Long-Term Incentive Plan (2011 LTI Plan) which expired during the second quarter of 2016. A total of 967,285 stock options and 289,637 restricted shares of common stock were granted under the 2011 LTI Plan. Compensation expense of $672 and $1,330 related to the nonvested awards under the 2011 LTI Plan and the 2006 Stock Option Plan was incurred for the second quarter and first six months of 2016, respectively, as compared to the compensation expense of $757 and $1,388 related to the nonvested awards under the 2006 Stock Option Plan incurred for the second quarter and first six months of 2015, 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 2011 LTI Plan (the Prior Plans); however, no common shares of United stock are available for grants under the Prior Plans as these plans have expired. Awards outstanding under the Prior Plans will remain in effect in accordance with their respective terms. The maximum term for options granted under the plans is ten (10) years. A summary of activity under United’s stock option plans as of June 30, 2016, and the changes during the first six months of 2016 are presented below: Six Months Ended June 30, 2016 Weighted Average Aggregate Remaining Intrinsic Contractual Exercise Shares Value Term (Yrs.) Price Outstanding at January 1, 2016 1,207,110 $ 28.15 Assumed in Bank of Georgetown merger 561,570 35.04 Granted 189,780 19.66 Exercised (105,010 ) 17.90 Forfeited or expired (14,666 ) 31.37 Outstanding at June 30, 2016 1,838,784 $ 20,822 6.1 $ 26.19 Exercisable at June 30, 2016 1,396,367 $ 19,126 5.2 $ 23.81 The following table summarizes the status of United’s nonvested stock option awards during the first six months of 2016: Shares Weighted-Average Nonvested at January 1, 2016 426,395 $ 6.68 Granted 189,780 6.97 Vested (162,183 ) 6.59 Forfeited or expired (11,575 ) 6.83 Nonvested at June 30, 2016 442,417 $ 6.83 During the six months ended June 30, 2016 and 2015, 105,010 and 147,419 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, 2016 and 2015 were issued from authorized and unissued stock. The total intrinsic value of options exercised under the Plans during the six months ended June 30, 2016 and 2015 was $1,774 and $1,100 respectively. Restricted Stock Currently, United only has restricted shares of common stock outstanding from the 2011 LTI Plan. Recipients of restricted shares do not pay any consideration to United for the shares, have the right to vote all shares subject to such grant and receive all dividends with respect to such shares, whether or not the shares have vested. Presently, nonvested participating securities have an immaterial impact on diluted earnings per share. The following summarizes the changes to United’s restricted common shares for the period ended June 30, 2016: Number of Weighted-Average Outstanding at January 1, 2016 129,772 $ 31.69 Granted 64,092 35.04 Vested (49,179 ) 30.51 Forfeited (3,793 ) 32.44 Outstanding at June 30, 2016 140,892 $ 33.60

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	14. EMPLOYEE BENEFIT PLANS United has a defined benefit retirement plan covering a majority of all 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. 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, including those retained in acquisitions, 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, 2015 are unrecognized actuarial losses of $55,998 ($35,727 net of tax) that have not yet been recognized in net periodic pension cost. The amortization of this item expected to be recognized in net periodic pension cost during the fiscal year ended December 31, 2016 is $4,618 ($2,946 net of tax). Net periodic pension cost for the three and six months ended June 30, 2016 and 2015 included the following components: Three Months Ended June 30 Six Months Ended June 30 2016 2015 2016 2015 Service cost $ 608 $ 748 $ 1,215 $ 1,488 Interest cost 1,456 1,446 2,912 2,876 Expected return on plan assets (2,012 ) (2,319 ) (4,024 ) (4,612 ) Recognized net actuarial loss 1,149 1,222 2,297 2,430 Net periodic pension (benefit) cost $ 1,201 $ 1,097 $ 2,400 $ 2,182 Weighted-Average Assumptions: Discount rate 4.75 % 4.35 % 4.75 % 4.35 % Expected return on assets 7.25 % 7.50 % 7.25 % 7.50 % 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, 2016
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, and a measurement attribute for all tax positions taken on a tax return, in order for those tax positions to be recognized in the financial statements. As of June 30, 2016, United has provided a liability for $2,203 of unrecognized tax benefits related to various federal and state income tax matters. The entire amount of unrecognized tax benefits, if recognized, would impact United’s effective tax rate. Over the next 12 months, the statute of limitations will close on certain income tax periods. However, at this time, United cannot reasonably estimate the amount of tax benefits it may recognize over the next 12 months. United is currently open to audit under the statute of limitations by the Internal Revenue Service for the years ended December 31, 2012, 2013 and 2014 and State Taxing authorities for the years ended December 31, 2012 through 2014. As of June 30, 2016 and 2015, the total amount of accrued interest related to uncertain tax positions was $772 and $728, respectively. United accounts for interest and penalties related to uncertain tax positions as part of its provision for federal and state income taxes.

Comprehensive Income

Comprehensive Income	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Comprehensive Income	16. COMPREHENSIVE INCOME The components of total comprehensive income for the three and six months ended June 30, 2016 and 2015 are as follows: Three Months Ended Six Months Ended June 30 June 30 2016 2015 2016 2015 Net Income $ 31,792 $ 34,809 $ 66,498 $ 69,436 Available for sale (“AFS”) securities: AFS securities with OTTI charges during the period (77 ) 0 (77 ) (100 ) Related income tax effect 28 0 28 36 Income tax rate change 0 316 0 316 Less : OTTI charges recognized in net income 33 0 33 34 Related income tax benefit (12 ) 0 (12 ) (12 ) Reclassification of previous noncredit OTTI to credit OTTI 415 0 415 0 Related income tax benefit (150 ) 0 (150 ) 0 Net unrealized (losses) gains on AFS securities with OTTI 237 316 237 274 AFS securities – all other: Change in net unrealized gain on AFS securities arising during the period 6,638 (10,053 ) 19,955 (1,582 ) Related income tax effect (2,403 ) 3,639 (7,224 ) 573 Net reclassification adjustment for (gains) losses included in net income (246 ) (3 ) (250 ) (49 ) Related income tax expense (benefit) 90 1 91 18 4,079 (6,416 ) 12,572 (1,040 ) Net effect of AFS securities on other comprehensive income 4,316 (6,100 ) 12,809 (766 ) 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 3 4 4 5 Related income tax expense (2 ) (2 ) (2 ) (2 ) Net effect of HTM securities on other comprehensive income 1 2 2 3 Pension plan: Recognized net actuarial loss 1,149 1,222 2,297 2,430 Related income tax benefit (420 ) (454 ) (839 ) (894 ) Net effect of change in pension plan asset on other comprehensive income 729 768 1,458 1,536 Total change in other comprehensive income 5,046 (5,330 ) 14,269 773 Total Comprehensive Income $ 36,838 $ 29,479 $ 80,767 $ 70,209 The components of accumulated other comprehensive income for the six months ended June 30, 2016 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2016 (Dollars in thousands) Unrealized Gains/Losses on AFS Accretion on the unrealized loss for securities transferred from AFS to the HTM Defined Benefit Pension Items Total Balance at January 1, 2016 ($ 2,515 ) ($ 57 ) ($ 35,640 ) ($ 38,212 ) Other comprehensive income before reclassification 12,703 2 0 12,705 Amounts reclassified from accumulated other comprehensive income 106 0 1,458 1,564 Net current-period other comprehensive income, net of tax 12,809 2 1,458 14,269 Balance at June 30, 2016 $ 10,294 ($ 55 ) ($ 34,182 ) ($ 23,943 ) (a) All amounts are net-of-tax. Reclassifications out of Accumulated Other Comprehensive Income (AOCI) For the Six Months Ended June 30, 2016 (Dollars in thousands) 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 $ 415 Total other-than-temporary impairment losses Net reclassification adjustment for losses (gains) included in net income (250 ) Net gains on sales/calls of investment securities 165 Total before tax Related income tax effect (59 ) Tax expense 106 Net of tax Pension plan: Recognized net actuarial loss 2,297 (a) 2,297 Total before tax Related income tax effect (839 ) Tax expense 1,458 Net of tax Total reclassifications for the period $ 1,564 (a) This AOCI component is included in the computation of net periodic pension cost (see Note 14, Employee Benefit Plans)

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2016
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 2016 2015 2016 2015 Distributed earnings allocated to common stock $ 25,114 $ 22,189 $ 48,068 $ 44,356 Undistributed earnings allocated to common stock 6,623 12,558 18,311 24,957 Net earnings allocated to common shareholders $ 31,737 $ 34,747 $ 66,379 $ 69,313 Average common shares outstanding 71,483,703 69,305,612 70,490,596 69,256,831 Equivalents from stock options 325,318 281,805 276,368 275,008 Average diluted shares outstanding 71,809,021 69,587,417 70,766,964 69,531,839 Earnings per basic common share $ 0.44 $ 0.50 $ 0.94 $ 1.00 Earnings per diluted common share $ 0.44 $ 0.50 $ 0.94 $ 1.00

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2016
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 thirteen statutory business trusts that were created for the purpose of raising funds that qualified for Tier I regulatory capital. These trusts, of which several were acquired through bank acquisitions, issued or participated in pools of trust preferred capital securities to third-party investors with the proceeds invested in junior subordinated debt securities of United. The Company, through a small capital contribution, owns 100% of the voting equity shares of each trust. The assets, liabilities, operations, and cash flows of each trust are solely related to the issuance, administration, and repayment of the preferred equity securities held by third-party investors. United fully and unconditionally guarantees the obligations of each trust and is obligated to redeem the junior subordinated debentures upon maturity. The trusts utilized in these transactions are VIEs as the third-party equity holders lack a controlling financial interest in the trusts through their inability to make decisions that have a significant effect on the operations and success of the entities. United does not consolidate these trusts as it is not the primary beneficiary of these entities because United’s equity interest does not absorb the majority of the trusts’ expected losses or receive a majority of their expected residual returns. Information related to United’s statutory trusts is presented in the table below: Description Issuance Date Amount of Capital Securities Issued Interest Rate Maturity Date Century Trust March 23, 2000 $ 8,800 10.875% Fixed March 8, 2030 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 United, through its banking subsidiaries, 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, 2016 As of December 31, 2015 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 240,563 $ 232,536 $ 8,027 $ 240,468 $ 232,492 $ 7,976 (1) Represents investment in VIEs.

Summary of New Accounting Sta27

Summary of New Accounting Standards (Policies)	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Summary of New Accounting Standards	In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses.” ASU 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 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. ASU 2016-13 is effective for United on January 1, 2020, with early adoption permitted, and management is currently evaluating the possible impact this standard may have on the Company’s financial condition or results of operations. In March 2016, the FASB issued ASU 2016-09, “Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 will change certain aspects of accounting for share-based payments to employees. The new guidance will, amongst other things, require all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also will allow an employer to repurchase more of an employee’s shares than it can today for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. ASU 2016-09 is effective for United on January 1, 2017, and 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 2016-02, “Leases (Topic 842)”. ASU 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 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. ASU 2016-02 is effective for United on January 1, 2019 and management is currently evaluating the possible impact this standard may have on the Company’s financial condition or results of operations. In January 2016, the FASB issued ASU 2016-01, “Financial Instruments Overall: Recognition and Measurement of Financial Assets and Financial Liabilities.” ASU 2016-01 makes changes to the classification and measurement of investments in equity securities, the presentation of certain fair value changes for financial liabilities measured at fair value under the fair value option and disclosure of fair value of instruments. In addition, ASU 2016-01 clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. ASU 2016-01 is effective for United on January 1, 2018 and is not expected to have a significant impact on the Company’s financial condition or results of operations. In September 2015, the FASB issued ASU 2015-16, “Simplifying the Accounting for Measurement-Period Adjustments” associated with a business combination, as part of its simplification initiative. ASU 2015-16 requires an acquirer to “recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined.” In addition, the acquirer must record, in the financial statements for the same period, “the effect on earnings of changes in depreciation, amortization, or other income effect, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date.” Entities must also “present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in the current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amount had been recognized as of the acquisition date.” ASU 2015-16 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In May 2015, the FASB issued ASU 2015-07, “Disclosures for Investment in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent), a consensus of the FASB Emerging Issues Task Force.” ASU 2015-07 modifies certain provisions of FASB Accounting Standards Codification Topic 820, Fair Value Measurement (ASC 820). ASU 2015-07 eliminates the requirement to categorize investments in the fair value hierarchy if an investment’s fair value is measured based on net asset value (NAV) per share (or its equivalent) using the practical expedient. The reporting entities will no longer be required to provide the related fair value disclosures for these securities but instead, will be required to disclose information to help users understand the nature of the investments as well as risks, including whether it is probable that the amount realized on the sale of the investments would differ from net asset value. ASU 2015-07 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In April 2015, the FASB issued ASU 2015-04, “Compensation – Retirement Benefits: Practical Expedient for the Measurement Date of an Employer’s Defined Benefit Obligation and Plan Assets.” ASU 2015-04 gives an employer whose fiscal year-end does not coincide with a calendar month-end the ability, as a practical expedient, to measure defined benefit retirement obligations and related plan assets as of the month-end that is closest to its fiscal year-end. ASU 2015-04 also provides guidance on accounting for contributions to the plan and significant events that require a remeasurement that occur during the period between a month-end measurement and the employer’s fiscal year-end. ASU 2015-04 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In April 2015, the FASB issued ASU 2015-03, “Simplifying the Presentation of Debt Issuance Costs.” Under ASU 2015-03, debt issuance costs are required to be presented as a direct deduction of debt balances on the statement of financial condition, similar to the presentation of debt discounts. ASU 2015-03 is limited to simplifying the presentation of debt issuance costs and does not change the recognition and measurement guidance for debt issuance costs. ASU 2015-03 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In February 2015, the FASB issued ASU 2015-02, “Amendments to the Consolidation Analysis.” ASU 2015-02 improves targeted areas of the consolidation guidance and reduces the number of consolidation models. The new consolidation standard eliminates the deferral of FAS 167 and makes changes to both the variable interest model and the voting model in ASC 810. ASU 2015-02 affects all entities, could change consolidation conclusions and may trigger additional disclosures. ASU 2015-02 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In January 2015, the FASB issued ASU 2015-01, “Income Statement, Extraordinary and Unusual Items (Subtopic 225-20).” ASU 2015-01 eliminates the separate presentation of extraordinary items but does not change the requirement to disclose material items that are unusual or infrequent in nature. Eliminating the concept of extraordinary items will allow entities to no longer have to assess whether a particular event or transaction is both unusual in nature and infrequent in occurrence. ASU 2015-01 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In June 2014, the FASB issued ASU 2014-12, “Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period.” ASU 2014-12 amends the guidance in FASB ASC 718, “Compensation-Stock Compensation”, to bring consistency to the accounting for share-based payment awards that require a specific performance target to be achieved in order for employees to become eligible to vest in the awards. The amendments affect all entities that grant their employees share-based payments in which the terms of the award provide that a performance target that affects vesting could be achieved after the requisite service period. ASU 2014-12 was effective for United on January 1, 2016 and did not have a significant impact on the Company’s financial condition or results of operations. In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” ASU 2014-09 supersedes the revenue recognition requirements in Accounting Standards Codification Topic 605, “Revenue Recognition”, and most industry-specific guidance throughout the Accounting Standards Codification. The amendments require an entity to recognize revenue upon the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The new revenue recognition standard sets forth a five step principle-based approach for determining revenue recognition. In April 2015, the FASB voted to defer the effective date of ASU 2014-09 by one-year for both public and private companies, and gave both public and private companies the option to “early” adopt using the original effective dates. ASU 2014-09 now will be effective for United on January 1, 2018 with early adoption permitted on January 1, 2017. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operations.
Fair Value Measurement	United determines the fair values of its financial instruments based on the fair value hierarchy established by ASC topic 820, which also clarifies that fair value of certain assets and liabilities is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The Fair Value Measurements and Disclosures topic specifies a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect United’s market assumptions. The three levels of the fair value hierarchy, based on these two types of inputs, are as follows: Level 1 - Valuation is based on quoted prices in active markets for identical assets and liabilities. Level 2 - Valuation is based on observable inputs including quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets and liabilities in less active markets, and model-based valuation techniques for which significant assumptions can be derived primarily from or corroborated by observable data in the market. Level 3 - Valuation is based on prices, inputs and model-based techniques that use one or more significant inputs or assumptions that are unobservable in the market. When determining the fair value measurements for assets and liabilities, United looks to active and observable markets to price identical assets or liabilities whenever possible and classifies such items in Level 1. When identical assets and liabilities are not traded in active markets, United looks to market observable data for similar assets and liabilities and classifies such items as Level 2. Nevertheless, certain assets and liabilities are not actively traded in observable markets and United must use alternative valuation techniques using unobservable inputs to determine a fair value and classifies such items as Level 3. For assets and liabilities that are not actively traded, the fair value measurement is based primarily upon estimates that require significant judgment. Therefore, the results may not be realized in an actual sale or immediate settlement of the asset or liability. Additionally, there are inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results of current or future values. The level within the fair value hierarchy is based on the lowest level of input that is significant in the fair value measurement.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Schedule of Acquired Identifiable Assets and Liabilities Assumed	The consideration paid for Bank of Georgetown’s common equity and the amounts of acquired identifiable assets and liabilities assumed as of the Acquisition Date were as follows: Purchase price: Value of common shares issued (6,527,746 shares) $ 253,799 Fair value of stock options assumed 10,696 Cash for fractional shares 10 Total purchase price 264,505 Identifiable assets: Cash and cash equivalents 29,340 Investment securities 219,781 Loans 966,206 Premises and equipment 5,581 Core deposit intangibles 11,406 Other assets 27,828 Total identifiable assets $ 1,260,142 Identifiable liabilities: Deposits $ 971,685 Short-term borrowings 101,020 Long-term borrowings 65,000 Other liabilities 13,856 Total identifiable liabilities 1,151,561 Preliminary fair value of net assets acquired including identifiable intangible assets 108,581 Preliminary resulting goodwill $ 155,924
Schedule of Business Acquisition Pro Forma Information	The following table presents certain unaudited pro forma information for the results of operations for the six months ended June 30, 2016 and 2015, as if the Bank of Georgetown merger had occurred on January 1, 2016 and 2015, respectively. Proforma 2016 2015 Total Revenues (1) $ 254,509 $ 248,109 Net Income 65,845 72,888 (1) Represents net interest income plus other income

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 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 $ 150,733 $ 2,843 $ 0 $ 153,576 $ 0 State and political subdivisions 165,101 5,765 73 170,793 0 Residential mortgage-backed securities Agency 600,988 14,817 64 615,741 0 Non-agency 7,641 176 9 7,808 86 Commercial mortgage-backed securities Agency 299,847 9,209 0 309,056 0 Asset-backed securities 1,831 0 1 1,830 0 Trust preferred collateralized debt obligations 49,275 651 17,917 32,009 25,952 Single issue trust preferred securities 13,337 294 2,373 11,258 0 Other corporate securities 14,995 92 0 15,087 0 Marketable equity securities 5,890 665 4 6,551 0 Total $ 1,309,638 $ 34,512 $ 20,441 $ 1,323,709 $ 26,038 December 31, 2015 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 $ 71,993 $ 1,793 $ 0 $ 73,786 $ 0 State and political subdivisions 130,685 3,144 51 133,778 0 Residential mortgage-backed securities Agency 473,109 5,580 707 477,982 0 Non-agency 9,119 457 5 9,571 458 Commercial mortgage-backed securities Agency 305,990 1,843 1,898 305,935 0 Asset-backed securities 3,404 0 5 3,399 0 Trust preferred collateralized debt obligations 49,386 635 15,335 34,686 25,952 Single issue trust preferred securities 13,811 249 2,367 11,693 0 Other corporate securities 9,999 50 0 10,049 0 Marketable equity securities 4,844 637 26 5,455 0 Total $ 1,072,340 $ 14,388 $ 20,394 $ 1,066,334 $ 26,410 (1) Non-credit related other-than-temporary impairment in accumulated other comprehensive income. Amounts are 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, 2016 and December 31, 2015. Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses June 30, 2016 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 0 $ 0 State and political subdivisions 16,406 73 0 0 Residential mortgage-backed securities Agency 31,918 64 0 0 Non-agency 0 0 268 9 Commercial mortgage-backed securities Agency 0 0 0 0 Asset-backed securities 0 0 1,830 1 Trust preferred collateralized debt obligations 1,126 187 25,983 17,730 Single issue trust preferred securities 4,150 493 3,810 1,880 Marketable equity securities 373 4 0 0 Total $ 53,973 $ 821 $ 31,891 $ 19,620 Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses December 31, 2015 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 0 $ 0 State and political subdivisions 15,550 51 0 0 Residential mortgage-backed securities Agency 90,004 707 0 0 Non-agency 348 5 0 0 Commercial mortgage-backed securities Agency 170,340 1,650 9,255 248 Asset-backed securities 3,399 5 0 0 Trust preferred collateralized debt obligations 3,304 135 28,633 15,200 Single issue trust preferred securities 4,225 404 3,720 1,963 Marketable equity securities 986 26 0 0 Total $ 288,156 $ 2,983 $ 41,608 $ 17,411
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 of United and its subsidiaries. Three Months Ended June 30 Six Months Ended June 30 2016 2015 2016 2015 Proceeds from sales and calls $ 159,232 $ 51,381 $ 194,231 $ 87,468 Gross realized gains 250 4 256 54 Gross realized losses 4 1 6 5
Summary of Unrealized Loss Positions of Available for Sale TRUP CDOs and Single Issue Trust Preferred Securities	The following is a summary of the available for sale Trup Cdos as of June 30, 2016: Amortized Cost Class Amortized Cost Fair Value Unrealized Loss Investment Split Below Senior – Bank $ 6,625 $ 5,847 $ 778 $ 4,484 $ 0 $ 2,141 Mezzanine – Bank (now in senior position) 11,352 8,180 3,172 0 0 11,352 Mezzanine – Bank 26,091 14,736 11,355 0 0 26,091 Mezzanine – Bank & Insurance (combination) 5,207 3,246 1,961 0 0 5,207 Totals $ 49,275 $ 32,009 $ 17,266 $ 4,484 $ 0 $ 44,791
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 2016 2015 2016 2015 Balance of cumulative credit losses at beginning of period $ 23,773 $ 23,773 $ 23,773 $ 23,739 Additional credit losses on securities for which OTTI was previously recognized 33 0 33 34 Reductions during the period for securities for which the amount previously recognized in other comprehensive income was recognized in earnings (1,644 ) 0 (1,644 ) 0 Balance of cumulative credit losses at end of period $ 22,162 $ 23,773 $ 22,162 $ 23,773
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, 2016 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 5,347 $ 792 $ 0 $ 6,139 State and political subdivisions 9,322 18 205 9,135 Residential mortgage-backed securities Agency 33 7 0 40 Single issue trust preferred securities 19,307 0 3,882 15,425 Other corporate securities 20 0 0 20 Total $ 34,029 $ 817 $ 4,087 $ 30,759 December 31, 2015 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 10,425 $ 860 $ 0 $ 11,285 State and political subdivisions 9,321 21 253 9,089 Residential mortgage-backed securities Agency 35 6 0 41 Single issue trust preferred securities 19,298 0 3,414 15,884 Other corporate securities 20 0 0 20 Total $ 39,099 $ 887 $ 3,667 $ 36,319
Available-for-sale Securities [Member]
Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value	The amortized cost and estimated fair value of securities available for sale at June 30, 2016 and December 31, 2015 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, 2016 December 31, 2015 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 98,087 $ 98,129 $ 10,448 $ 10,515 Due after one year through five years 296,081 302,838 273,469 274,158 Due after five years through ten years 212,521 222,195 213,274 216,636 Due after ten years 697,059 693,996 570,305 559,570 Marketable equity securities 5,890 6,551 4,844 5,455 Total $ 1,309,638 $ 1,323,709 $ 1,072,340 $ 1,066,334
Held-to-maturity Securities [Member]
Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value	The amortized cost and estimated fair value of debt securities held to maturity at June 30, 2016 and December 31, 2015 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, 2016 December 31, 2015 Estimated Estimated Amortized Fair Amortized Fair Cost Value Cost Value Due in one year or less $ 1,000 $ 1,000 $ 5,029 $ 5,121 Due after one year through five years 8,624 9,432 9,672 10,458 Due after five years through ten years 4,045 3,843 4,045 3,794 Due after ten years 20,360 16,484 20,353 16,946 Total $ 34,029 $ 30,759 $ 39,099 $ 36,319

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Major Classes of Loans	Major classes of loans are as follows: June 30, 2016 December 31, Commercial, financial and agricultural: Owner-occupied commercial real estate $ 877,393 $ 927,746 Nonowner-occupied commercial real estate 3,675,865 2,896,367 Other commercial loans 1,684,008 1,602,222 Total commercial, financial & agricultural 6,237,266 5,426,335 Residential real estate 2,403,466 2,268,685 Construction & land development 1,285,171 1,273,054 Consumer: Bankcard 12,074 11,653 Other consumer 499,377 419,225 Total gross loans $ 10,437,354 $ 9,398,952
Activity for Accretable Yield	Activity for the accretable yield for the first six months of 2016 follows: Accretable yield at the beginning of the period $ 12,156 Accretion (including cash recoveries) (4,636 ) Net reclassifications to accretable from non-accretable 2,530 Disposals (including maturities, foreclosures, and charge-offs) (1,712 ) Accretable yield at the end of the period $ 8,338

Credit Quality (Tables)

Credit Quality (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 and 2015, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2016 June 30, 2015 Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate: Owner-occupied 1 $ 1,190 $ 1,188 0 $ 0 $ 0 Nonowner-occupied 0 0 0 1 669 669 Other commercial 1 700 700 0 0 0 Residential real estate 0 0 0 0 0 0 Construction & land development 0 0 0 0 0 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total 2 $ 1,890 $ 1,888 1 $ 669 $ 669 The following table sets forth United’s troubled debt restructurings that have been restructured during the six months ended June 30, 2016 and 2015, segregated by class of loans: Troubled Debt Restructurings For the Six Months Ended June 30, 2016 June 30, 2015 Number of Pre- Modification Post- Modification Number of Pre- Modification Post- Modification Commercial real estate: Owner-occupied 1 $ 1,190 $ 1,188 0 $ 0 $ 0 Nonowner-occupied 0 0 0 1 669 669 Other commercial 4 2,141 2,134 1 240 240 Residential real estate 1 1,400 1,400 0 0 0 Construction & land development 0 0 0 0 0 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total 6 $ 4,731 $ 4,722 2 $ 909 $ 909
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, 2016 30-89 90 Days Total Past Current & Total Financing Recorded & Accruing Commercial real estate: Owner-occupied $ 8,422 $ 8,828 $ 17,250 $ 860,143 $ 877,393 $ 0 Nonowner-occupied 10,699 17,688 28,387 3,647,478 3,675,865 0 Other commercial 11,090 36,202 47,292 1,636,716 1,684,008 699 Residential real estate 32,796 23,018 55,814 2,347,652 2,403,466 3,463 Construction & land development 9,191 11,433 20,624 1,264,547 1,285,171 37 Consumer: Bankcard 331 103 434 11,640 12,074 103 Other consumer 8,660 1,513 10,173 489,204 499,377 1,292 Total $ 81,189 $ 98,785 $ 179,974 $ 10,257,380 $ 10,437,354 $ 5,594 (1) Other includes loans with a recorded investment of $111,137 acquired and accounted for under ASC topic 310-30 “Loans and Debt Securities Acquired with Deteriorated Credit Quality”. Age Analysis of Past Due Loans As of December 31, 2015 30-89 90 Days or more Total Past Current & Total Financing Recorded & Accruing Commercial real estate: Owner-occupied $ 8,639 $ 9,831 $ 18,470 $ 909,276 $ 927,746 $ 400 Nonowner-occupied 24,209 26,126 50,335 2,846,032 2,896,367 552 Other commercial 14,888 33,297 48,185 1,554,037 1,602,222 3,643 Residential real estate 44,312 28,332 72,644 2,196,041 2,268,685 4,294 Construction & land development 2,412 15,416 17,828 1,255,226 1,273,054 1,347 Consumer: Bankcard 223 168 391 11,262 11,653 168 Other consumer 9,082 1,596 10,678 408,547 419,225 1,224 Total $ 103,765 $ 114,766 $ 218,531 $ 9,180,421 $ 9,398,952 $ 11,628 (1) Other includes loans with a recorded investment of $148,197 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, 2016 December 31, 2015 Commercial real estate: Owner-occupied $ 8,828 $ 9,431 Nonowner-occupied 17,688 25,574 Other commercial 35,503 29,654 Residential real estate 19,555 24,038 Construction & land development 11,396 14,069 Consumer: Bankcard 0 0 Other consumer 221 372 Total $ 93,191 $ 103,138
Schedule of Credit Quality Indicators Information, by Class of Loans	The following tables set forth United’s credit quality indicators information, by class of loans: Credit Quality Indicators Corporate Credit Exposure As of June 30, 2016 Commercial Real Estate Construction Owner- occupied Nonowner- occupied Other Commercial & Land Development Grade: Pass $ 760,312 $ 3,522,786 $ 1,538,941 $ 1,127,373 Special mention 38,739 31,690 26,435 55,444 Substandard 78,342 121,389 115,922 102,234 Doubtful 0 0 2,710 120 Total $ 877,393 $ 3,675,865 $ 1,684,008 $ 1,285,171 As of December 31, 2015 Commercial Real Estate Construction Owner- occupied Nonowner- occupied Other Commercial & Land Development Grade: Pass $ 835,082 $ 2,710,504 $ 1,436,670 $ 1,095,238 Special mention 20,391 32,249 26,148 59,100 Substandard 72,273 153,614 136,585 118,716 Doubtful 0 0 2,819 0 Total $ 927,746 $ 2,896,367 $ 1,602,222 $ 1,273,054 Credit Quality Indicators Consumer Credit Exposure As of June 30, 2016 Residential Real Estate Bankcard Other Consumer Grade: Pass $ 2,336,352 $ 11,640 $ 488,943 Special mention 20,667 331 8,769 Substandard 46,008 103 1,665 Doubtful 439 0 0 Total $ 2,403,466 $ 12,074 $ 499,377 As of December 31, 2015 Residential Real Estate Bankcard Other Consumer Grade: Pass $ 2,195,420 $ 11,262 $ 408,271 Special mention 13,494 223 9,188 Substandard 57,981 168 1,766 Doubtful 1,790 0 0 Total $ 2,268,685 $ 11,653 $ 419,225
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, 2016 December 31, 2015 Recorded Unpaid Related Recorded Unpaid Related With no related allowance recorded: Commercial real estate: Owner-occupied $ 26,557 $ 27,090 $ 0 $ 36,615 $ 36,828 $ 0 Nonowner-occupied 59,080 59,575 0 69,053 69,517 0 Other commercial 22,654 24,889 0 30,433 32,158 0 Residential real estate 27,833 29,420 0 21,431 22,329 0 Construction & land development 21,891 24,105 0 28,245 29,953 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 39 39 0 32 32 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,915 $ 4,915 $ 1,712 $ 4,555 $ 4,555 $ 1,253 Nonowner-occupied 10,800 10,800 1,716 7,890 7,890 1,362 Other commercial 35,486 36,786 16,617 29,486 33,127 18,269 Residential real estate 4,034 4,769 898 13,305 14,625 2,118 Construction & land development 11,273 14,331 4,939 14,132 20,135 4,789 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 31,472 $ 32,005 $ 1,712 $ 41,170 $ 41,383 $ 1,253 Nonowner-occupied 69,880 70,375 1,716 76,943 77,407 1,362 Other commercial 58,140 61,675 16,617 59,919 65,285 18,269 Residential real estate 31,867 34,189 898 34,736 36,954 2,118 Construction & land development 33,164 38,436 4,939 42,377 50,088 4,789 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 39 39 0 32 32 0 Impaired Loans For the Three Months Ended June 30, 2016 June 30, 2015 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 27,267 $ 125 $ 43,898 $ 117 Nonowner-occupied 62,049 186 66,936 354 Other commercial 25,816 124 35,659 140 Residential real estate 28,074 97 30,867 97 Construction & land development 22,838 40 36,722 80 Consumer: Bankcard 0 0 0 0 Other consumer 33 0 35 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,552 $ 30 $ 4,789 $ 20 Nonowner-occupied 8,615 195 6,847 7 Other commercial 37,584 98 19,764 154 Residential real estate 8,174 19 7,119 18 Construction & land development 11,919 48 10,740 58 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 31,819 $ 155 $ 48,687 $ 137 Nonowner-occupied 70,664 381 73,783 361 Other commercial 63,400 222 55,423 294 Residential real estate 36,248 116 37,986 115 Construction & land development 34,757 88 47,462 138 Consumer: Bankcard 0 0 0 0 Other consumer 33 0 35 0 Impaired Loans For the Six Months Ended June 30, 2016 June 30, 2015 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 33,221 $ 184 $ 40,294 $ 179 Nonowner-occupied 66,395 393 61,290 517 Other commercial 27,861 224 32,580 240 Residential real estate 26,872 237 31,912 146 Construction & land development 25,916 67 45,541 159 Consumer: Bankcard 0 0 0 0 Other consumer 34 0 40 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,564 $ 57 $ 4,936 $ 58 Nonowner-occupied 8,507 238 7,112 46 Other commercial 34,134 228 19,083 218 Residential real estate 9,339 25 6,692 29 Construction & land development 12,994 90 10,833 92 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 37,785 $ 241 $ 45,230 $ 237 Nonowner-occupied 74,902 631 68,402 563 Other commercial 61,995 452 51,663 458 Residential real estate 36,211 262 38,604 175 Construction & land development 38,910 157 56,374 251 Consumer: Bankcard 0 0 0 0 Other consumer 34 0 40 0

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 Commercial Real Estate Other Residential Construction Consumer Allowance for Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 5,348 $ 6,201 $ 32,640 $ 13,547 $ 15,266 $ 2,273 $ 215 $ 75,490 Charge-offs 1,328 45 7,364 1,136 1,429 685 0 11,987 Recoveries 588 122 29 236 195 108 0 1,278 Provision 2,346 449 5,052 (542 ) (642 ) 861 143 7,667 Ending balance $ 6,954 $ 6,727 $ 30,357 $ 12,105 $ 13,390 $ 2,557 $ 358 $ 72,448 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2016 Commercial Real Estate Other Residential Construction Consumer Allowance for Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 3,637 $ 5,309 $ 31,328 $ 15,148 $ 18,205 $ 1,995 $ 104 $ 75,726 Charge-offs 2,673 408 11,118 1,845 1,429 1,460 0 18,933 Recoveries 1,369 626 1,009 447 254 248 0 3,953 Provision 4,621 1,200 9,138 (1,645 ) (3,640 ) 1,774 254 11,702 Ending balance $ 6,954 $ 6,727 $ 30,357 $ 12,105 $ 13,390 $ 2,557 $ 358 $ 72,448 Ending Balance: individually evaluated for impairment $ 1,712 $ 1,716 $ 16,617 $ 898 $ 4,939 $ 0 $ 0 $ 25,882 Ending Balance: collectively evaluated for impairment $ 5,242 $ 5,011 $ 13,740 $ 11,207 $ 8,451 $ 2,557 $ 358 $ 46,566 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 877,394 $ 3,675,864 $ 1,684,008 $ 2,403,466 $ 1,285,171 $ 511,451 $ 0 $ 10,437,354 Ending Balance: individually evaluated for impairment $ 15,034 $ 19,648 $ 44,388 $ 14,845 $ 13,822 $ 0 $ 0 $ 107,737 Ending Balance: collectively evaluated for impairment $ 848,843 $ 3,611,531 $ 1,625,065 $ 2,377,034 $ 1,244,595 $ 511,412 $ 0 $ 10,218,480 Ending Balance: loans acquired with deteriorated credit quality $ 13,517 $ 44,685 $ 14,555 $ 11,587 $ 26,754 $ 39 $ 0 $ 111,137 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2015 Commercial Real Estate Construction Allowance Owner- Nonowner- Other Residential & Land Consumer Estimated Total Allowance for Loan Losses: Beginning balance $ 4,041 $ 8,167 $ 26,931 $ 13,835 $ 19,402 $ 3,083 $ 70 $ 75,529 Charge-offs (4,755 ) (1,120 ) (10,042 ) (6,411 ) (862 ) (2,309 ) (0 ) (25,499 ) Recoveries 829 74 714 495 511 499 0 3,122 Provision 3,522 (1,812 ) 13,725 7,229 (846 ) 722 34 22,574 Ending balance $ 3,637 $ 5,309 $ 31,328 $ 15,148 $ 18,205 $ 1,995 $ 104 $ 75,726 Ending Balance: individually evaluated for impairment $ 1,253 $ 1,362 $ 18,269 $ 2,119 $ 4,789 $ 0 $ 0 $ 27,792 Ending Balance: collectively evaluated for impairment $ 2,384 $ 3,947 $ 13,059 $ 13,029 $ 13,416 $ 1,995 $ 104 $ 47,934 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Financing receivables: Ending balance $ 927,746 $ 2,896,367 $ 1,602,222 $ 2,268,685 $ 1,273,054 $ 430,878 $ 0 $ 9,398,952 Ending Balance: individually evaluated for impairment $ 12,670 $ 26,152 $ 35,342 $ 17,782 $ 15,779 $ 0 $ 0 $ 107,725 Ending Balance: collectively evaluated for impairment $ 888,802 $ 2,817,748 $ 1,546,018 $ 2,237,865 $ 1,221,760 $ 430,837 $ 0 $ 9,143,030 Ending Balance: loans acquired with deteriorated credit quality $ 26,274 $ 52,467 $ 20,862 $ 13,038 $ 35,515 $ 41 $ 0 $ 148,197

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2016
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: As of June 30, 2016 Gross Carrying Accumulated Net Carrying Amortized intangible assets: Core deposit intangible assets $ 71,983 ($ 44,400 ) $ 27,583 Goodwill not subject to amortization $ 866,176 As of December 31, 2015 Gross Carrying Accumulated Net Carrying Amortized intangible assets: Core deposit intangible assets $ 60,577 ($ 42,737 ) $ 17,840 Goodwill not subject to amortization $ 710,252
Reconciliation of Goodwill	The following table provides a reconciliation of goodwill: Goodwill at December 31, 2015 $ 710,252 Preliminary addition to goodwill from Bank of Georgetown acquisition 155,924 Goodwill at June 30, 2016 $ 866,176
Schedule of Anticipated Amortization Expense	The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2015: Year Amount 2016 $ 4,193 2017 4,559 2018 4,000 2019 3,703 2020 and thereafter 12,791

Long-Term Borrowings (Tables)

Long-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Schedule of Maturities of FHLB Borrowings	The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2016 $ 995,589 2017 230,240 2018 10,000 2019 35,000 2020 and thereafter 25,000 Total $ 1,295,829

Derivative Financial Instrume35

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The following table sets forth certain information regarding the interest rate derivatives portfolio used for interest-rate risk management purposes and designated as accounting hedges under the Derivatives and Hedging topic at June 30, 2016. Derivative Classifications and Hedging Relationships June 30, 2016 Notional Amount Average Pay Rate Fair Value Hedges: Pay Fixed Swaps (Hedging Commercial Loans) $ 96,500 3.64 % Total Derivatives Used in Fair Value Hedges $ 96,500 Total Derivatives Used for Interest Rate Risk Management and Designated as Hedges $ 96,500
Schedule of Fair Value Derivative Financial Instruments	The following tables summarize the fair value of United’s derivative financial instruments. Asset Derivatives June 30, 2016 December 31, 2015 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other assets $ 0 Other assets $ 0 Total derivatives designated as hedging instruments $ 0 $ 0 Derivatives not designated as hedging instruments Interest rate contracts Other assets $ 2,515 Other assets $ 2,942 Total derivatives not designated as hedging instruments $ 2,515 $ 2,942 Total asset derivatives $ 2,515 $ 2,942 Liability Derivatives June 30, 2016 December 31, 2015 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other liabilities $ 7,458 Other liabilities $ 1,179 Total derivatives designated as hedging instruments $ 7,458 $ 1,179 Derivatives not designated as hedging instruments Interest rate contracts Other liabilities $ 2,515 Other liabilities $ 2,942 Total derivatives not designated as hedging instruments $ 2,515 $ 2,942 Total liability derivatives $ 9,973 $ 4,121
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, 2016 and 2015 are presented as follows: Income Statement Location Three Months Ended June 30, June 30, Derivatives in fair value hedging relationships Interest rate contracts Interest income/ (expense) $ (249 ) $ 96 Total derivatives in fair value hedging relationships $ (249 ) $ 96 Derivatives not designated as hedging instruments Interest rate contracts (1) Other income $ 0 $ 0 Total derivatives not designated as hedging instruments $ 0 $ 0 Total derivatives $ (249 ) $ 96 Income Statement Location Six Months Ended June 30, June 30, Derivatives in fair value hedging relationships Interest rate contracts Interest income/ (expense) $ 32 $ (328 ) Total derivatives in fair value hedging relationships $ 32 $ (328 ) Derivatives not designated as hedging instruments Interest rate contracts (1) Other income $ 0 $ 0 Total derivatives not designated as hedging instruments $ 0 $ 0 Total derivatives $ 32 $ (328 ) (1) Represents net gains from derivative assets not designated as hedging instruments.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 and December 31, 2015, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2016 Using Description Balance as of June 30, 2016 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 $ 153,576 $ 0 $ 153,576 $ 0 State and political subdivisions 170,793 0 170,793 0 Residential mortgage-backed securities Agency 615,741 0 615,741 0 Non-agency 7,808 0 7,808 0 Asset-backed securities 1,830 0 1,830 0 Commercial mortgage-backed securities Agency 309,056 0 309,056 0 Trust preferred collateralized debt obligations 32,009 0 0 32,009 Single issue trust preferred securities 11,258 0 11,258 0 Other corporate securities 15,087 0 15,087 0 Total available for sale debt securities 1,317,158 0 1,285,149 32,009 Available for sale equity securities: Financial services industry 3,652 817 2,835 0 Equity mutual funds (1) 1,735 1,735 0 0 Other equity securities 1,164 1,164 0 0 Total available for sale equity securities 6,551 3,716 2,835 0 Total available for sale securities 1,323,709 3,716 1,287,984 32,009 Derivative financial assets: Interest rate contracts 2,515 0 2,515 0 Liabilities Derivative financial liabilities: Interest rate contracts 9,973 0 9,973 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, 2015 Using Description Balance as of December 31, 2015 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 $ 73,786 $ 0 $ 73,786 $ 0 State and political subdivisions 133,778 0 133,778 0 Residential mortgage-backed securities Agency 477,982 0 477,982 0 Non-agency 9,571 0 9,571 0 Asset-backed securities 3,399 0 3,399 0 Commercial mortgage-backed securities Agency 305,935 0 305,935 0 Fair Value at December 31, 2015 Using Description Balance as of December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Trust preferred collateralized debt obligations 34,686 0 0 34,686 Single issue trust preferred securities 11,693 0 11,693 0 Other corporate securities 10,049 0 10,049 0 Total available for sale debt securities 1,060,879 0 1,026,193 34,686 Available for sale equity securities: Financial services industry 2,723 800 1,923 0 Equity mutual funds (1) 1,596 1,596 0 0 Other equity securities 1,136 1,136 0 0 Total available for sale equity securities 5,455 3,532 1,923 0 Total available for sale securities 1,066,334 3,532 1,028,116 34,686 Derivative financial assets: Interest rate contracts 2,942 0 2,942 0 Liabilities Derivative financial liabilities: Interest rate contracts 4,121 0 4,121 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, 2016 and December 31, 2015 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, 2016 December 31, Balance, beginning of period $ 34,686 $ 39,558 Total gains or losses (realized/unrealized): Included in earnings (or changes in net assets) 0 (34 ) Included in other comprehensive income (2,677 ) (4,838 ) Purchases, issuances, and settlements 0 0 Transfers in and/or out of Level 3 0 0 Balance, end of period $ 32,009 $ 34,686 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
Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis	The following table summarizes United’s financial assets that were measured at fair value on a nonrecurring basis during the period: Description Balance as of June 30, 2016 Carrying value at June 30, 2016 YTD Losses Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Assets Impaired Loans $ 66,508 $ 0 $ 20,003 $ 46,505 $ 3,915 OREO 34,894 0 34,628 266 1,865 Carrying value at December 31, 2015 Description Balance as of December 31, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) YTD Losses Assets Impaired Loans $ 69,368 $ 0 $ 29,186 $ 40,182 $ 8,485 OREO 32,228 0 32,228 0 1,141
Summary of Estimated Fair Values of Financial Instruments	The estimated fair values of United’s financial instruments are summarized below: Fair Value Measurements Carrying Fair Value Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) June 30, 2016 Cash and cash equivalents $ 1,101,469 $ 1,101,469 $ 0 $ 1,101,469 $ 0 Securities available for sale 1,323,709 1,323,709 3,716 1,287,984 32,009 Securities held to maturity 34,029 30,759 0 27,739 3,020 Other securities 125,413 119,143 0 0 119,143 Loans held for sale 6,226 6,226 0 6,226 0 Loans 10,350,410 10,410,066 0 0 10,410,066 Derivative financial assets 2,515 2,515 0 2,515 0 Deposits 10,315,853 10,300,805 0 10,300,805 0 Short-term borrowings 735,323 735,323 0 735,323 0 Long-term borrowings 1,169,892 1,141,151 0 1,141,151 0 Derivative financial liabilities 9,973 9,973 0 9,973 0 December 31, 2015 Cash and cash equivalents $ 857,335 $ 857,335 $ 0 $ 857,335 $ 0 Securities available for sale 1,066,334 1,066,334 3,532 1,028,116 34,686 Securities held to maturity 39,099 36,320 0 33,300 3,020 Other securities 98,749 93,811 0 0 93,811 Loans held for sale 10,681 10,681 0 10,681 0 Loans 9,308,354 9,289,463 0 0 9,289,463 Derivative financial assets 2,942 2,942 0 2,942 0 Deposits 9,341,527 9,332,451 0 9,332,451 0 Short-term borrowings 423,028 423,028 0 423,028 0 Long-term borrowings 1,015,249 988,270 0 988,270 0 Derivative financial liabilities 4,121 4,121 0 4,121 0

Stock Based Compensation (Table

Stock Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016, and the changes during the first six months of 2016 are presented below: Six Months Ended June 30, 2016 Weighted Average Aggregate Remaining Intrinsic Contractual Exercise Shares Value Term (Yrs.) Price Outstanding at January 1, 2016 1,207,110 $ 28.15 Assumed in Bank of Georgetown merger 561,570 35.04 Granted 189,780 19.66 Exercised (105,010 ) 17.90 Forfeited or expired (14,666 ) 31.37 Outstanding at June 30, 2016 1,838,784 $ 20,822 6.1 $ 26.19 Exercisable at June 30, 2016 1,396,367 $ 19,126 5.2 $ 23.81
Status of United's Nonvested Stock Option Awards	The following table summarizes the status of United’s nonvested stock option awards during the first six months of 2016: Shares Weighted-Average Nonvested at January 1, 2016 426,395 $ 6.68 Granted 189,780 6.97 Vested (162,183 ) 6.59 Forfeited or expired (11,575 ) 6.83 Nonvested at June 30, 2016 442,417 $ 6.83
Changes to United's Restricted Common Shares	The following summarizes the changes to United’s restricted common shares for the period ended June 30, 2016: Number of Weighted-Average Outstanding at January 1, 2016 129,772 $ 31.69 Granted 64,092 35.04 Vested (49,179 ) 30.51 Forfeited (3,793 ) 32.44 Outstanding at June 30, 2016 140,892 $ 33.60

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]
Net Periodic Pension Cost	Net periodic pension cost for the three and six months ended June 30, 2016 and 2015 included the following components: Three Months Ended June 30 Six Months Ended June 30 2016 2015 2016 2015 Service cost $ 608 $ 748 $ 1,215 $ 1,488 Interest cost 1,456 1,446 2,912 2,876 Expected return on plan assets (2,012 ) (2,319 ) (4,024 ) (4,612 ) Recognized net actuarial loss 1,149 1,222 2,297 2,430 Net periodic pension (benefit) cost $ 1,201 $ 1,097 $ 2,400 $ 2,182 Weighted-Average Assumptions: Discount rate 4.75 % 4.35 % 4.75 % 4.35 % Expected return on assets 7.25 % 7.50 % 7.25 % 7.50 % 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, 2016
Equity [Abstract]
Components of Total Comprehensive Income	The components of total comprehensive income for the three and six months ended June 30, 2016 and 2015 are as follows: Three Months Ended Six Months Ended June 30 June 30 2016 2015 2016 2015 Net Income $ 31,792 $ 34,809 $ 66,498 $ 69,436 Available for sale (“AFS”) securities: AFS securities with OTTI charges during the period (77 ) 0 (77 ) (100 ) Related income tax effect 28 0 28 36 Income tax rate change 0 316 0 316 Less : OTTI charges recognized in net income 33 0 33 34 Related income tax benefit (12 ) 0 (12 ) (12 ) Reclassification of previous noncredit OTTI to credit OTTI 415 0 415 0 Related income tax benefit (150 ) 0 (150 ) 0 Net unrealized (losses) gains on AFS securities with OTTI 237 316 237 274 AFS securities – all other: Change in net unrealized gain on AFS securities arising during the period 6,638 (10,053 ) 19,955 (1,582 ) Related income tax effect (2,403 ) 3,639 (7,224 ) 573 Net reclassification adjustment for (gains) losses included in net income (246 ) (3 ) (250 ) (49 ) Related income tax expense (benefit) 90 1 91 18 4,079 (6,416 ) 12,572 (1,040 ) Net effect of AFS securities on other comprehensive income 4,316 (6,100 ) 12,809 (766 ) 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 3 4 4 5 Related income tax expense (2 ) (2 ) (2 ) (2 ) Net effect of HTM securities on other comprehensive income 1 2 2 3 Pension plan: Recognized net actuarial loss 1,149 1,222 2,297 2,430 Related income tax benefit (420 ) (454 ) (839 ) (894 ) Net effect of change in pension plan asset on other comprehensive income 729 768 1,458 1,536 Total change in other comprehensive income 5,046 (5,330 ) 14,269 773 Total Comprehensive Income $ 36,838 $ 29,479 $ 80,767 $ 70,209
Components of Accumulated Other Comprehensive Income	The components of accumulated other comprehensive income for the six months ended June 30, 2016 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2016 (Dollars in thousands) Unrealized Gains/Losses on AFS Accretion on the unrealized loss for securities transferred from AFS to the HTM Defined Benefit Pension Items Total Balance at January 1, 2016 ($ 2,515 ) ($ 57 ) ($ 35,640 ) ($ 38,212 ) Other comprehensive income before reclassification 12,703 2 0 12,705 Amounts reclassified from accumulated other comprehensive income 106 0 1,458 1,564 Net current-period other comprehensive income, net of tax 12,809 2 1,458 14,269 Balance at June 30, 2016 $ 10,294 ($ 55 ) ($ 34,182 ) ($ 23,943 ) (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, 2016 (Dollars in thousands) 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 $ 415 Total other-than-temporary impairment losses Net reclassification adjustment for losses (gains) included in net income (250 ) Net gains on sales/calls of investment securities 165 Total before tax Related income tax effect (59 ) Tax expense 106 Net of tax Pension plan: Recognized net actuarial loss 2,297 (a) 2,297 Total before tax Related income tax effect (839 ) Tax expense 1,458 Net of tax Total reclassifications for the period $ 1,564 (a) This AOCI component is included in the computation of net periodic pension cost (see Note 14, Employee Benefit Plans)

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
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 2016 2015 2016 2015 Distributed earnings allocated to common stock $ 25,114 $ 22,189 $ 48,068 $ 44,356 Undistributed earnings allocated to common stock 6,623 12,558 18,311 24,957 Net earnings allocated to common shareholders $ 31,737 $ 34,747 $ 66,379 $ 69,313 Average common shares outstanding 71,483,703 69,305,612 70,490,596 69,256,831 Equivalents from stock options 325,318 281,805 276,368 275,008 Average diluted shares outstanding 71,809,021 69,587,417 70,766,964 69,531,839 Earnings per basic common share $ 0.44 $ 0.50 $ 0.94 $ 1.00 Earnings per diluted common share $ 0.44 $ 0.50 $ 0.94 $ 1.00

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Information Related to Statutory Trusts	Information related to United’s statutory trusts is presented in the table below: Description Issuance Date Amount of Capital Securities Issued Interest Rate Maturity Date Century Trust March 23, 2000 $ 8,800 10.875% Fixed March 8, 2030 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
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, 2016 As of December 31, 2015 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 240,563 $ 232,536 $ 8,027 $ 240,468 $ 232,492 $ 7,976 (1) Represents investment in VIEs.

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) - USD ($)	Jun. 03, 2016	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Total assets at consummation		$ 14,338,012,000	$ 12,577,944,000
Loans at consummation		10,437,354,000	9,398,952,000
Deposits at consummation		10,315,853,000	9,341,527,000
Resulting goodwill		866,176,000	$ 710,252,000
Liabilities to provide severance benefits		$ 0
Bank of Georgetown [Member]
Business Acquisition [Line Items]
Outstanding common stock acquired		100.00%
Total assets at consummation		$ 1,278,841,000
Loans at consummation		999,773,000
Deposits at consummation		$ 971,369,000
Common stock paid in cash	$ 264,505,000
Common stock value	253,799,000
Stock options exchanged value	$ 10,696,000
Common stock, shares issued	6,527,746	561,570
Resulting goodwill	$ 155,924,000
Fractional shares cash paid per share	10,000
Goodwill from acquisition expected to be tax deductible	0
Downward fair value adjustment on loans acquired	33,567,000
Premium on interest-bearing deposits acquired	316,000
Assumed liabilities to provide severance benefits		$ 300,000
Revenue since acquisition included in consolidated results		15,780,000
Revenue since acquisition included in consolidated results		$ 6,746,000
Bank of Georgetown [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Common stock value	$ 253,799,000
Common stock, shares issued	6,527,746
Closing market price per common share	$ 38.88
Bank of Georgetown [Member] | Core Deposit Intangible Assets [Member]
Business Acquisition [Line Items]
Purchase price allocation of Identifiable Intangible assets	$ 11,406,000
Estimated period of amortization of core deposit intangibles	10 years
Fractional shares cash paid per share	$ 10,000

Mergers and Acquisitions - Sche

Mergers and Acquisitions - Schedule of Acquired Identifiable Assets and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Jun. 03, 2016	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Preliminary resulting goodwill		$ 866,176	$ 710,252
Bank of Georgetown [Member]
Business Acquisition [Line Items]
Value of common shares issued (6,527,746 shares)	$ 253,799
Fair value of stock options assumed	10,696
Cash for fractional shares	10
Total purchase price	264,505
Cash and cash equivalents	29,340
Investment securities	219,781
Loans	966,206
Premises and equipment	5,581
Other assets	27,828
Total identifiable assets	1,260,142
Deposits	971,685
Short-term borrowings	101,020
Long-term borrowings	65,000
Other liabilities	13,856
Total identifiable liabilities	1,151,561
Preliminary fair value of net assets acquired including identifiable intangible assets	108,581
Preliminary resulting goodwill	155,924
Bank of Georgetown [Member] | Core Deposit Intangible Assets [Member]
Business Acquisition [Line Items]
Cash for fractional shares	10
Core deposit intangibles	$ 11,406

Mergers and Acquisitions - Sc44

Mergers and Acquisitions - Schedule of Acquired Identifiable Assets and Liabilities Assumed (Parenthetical) (Detail) - shares	Jun. 03, 2016	Jun. 30, 2016
Bank of Georgetown [Member]
Business Acquisition [Line Items]
Common stock, shares issued	6,527,746	561,570

Mergers and Acquisitions - Sc45

Mergers and Acquisitions - Schedule of Business Acquisition Pro Forma Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Business Combinations [Abstract]
Total Revenues	$ 254,509	$ 248,109
Net Income	$ 65,845	$ 72,888

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Amortized Cost	$ 1,309,638	$ 1,072,340
Gross Unrealized Gains	34,512	14,388
Gross Unrealized Losses	20,441	20,394
Estimated Fair Value	1,323,709	1,066,334
Cumulative OTTI in AOCI	26,038	26,410
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	150,733	71,993
Gross Unrealized Gains	2,843	1,793
Gross Unrealized Losses	0	0
Estimated Fair Value	153,576	73,786
Cumulative OTTI in AOCI	0	0
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Amortized Cost	165,101	130,685
Gross Unrealized Gains	5,765	3,144
Gross Unrealized Losses	73	51
Estimated Fair Value	170,793	133,778
Cumulative OTTI in AOCI	0	0
Residential Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	600,988	473,109
Gross Unrealized Gains	14,817	5,580
Gross Unrealized Losses	64	707
Estimated Fair Value	615,741	477,982
Cumulative OTTI in AOCI	0	0
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	7,641	9,119
Gross Unrealized Gains	176	457
Gross Unrealized Losses	9	5
Estimated Fair Value	7,808	9,571
Cumulative OTTI in AOCI	86	458
Commercial Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	299,847	305,990
Gross Unrealized Gains	9,209	1,843
Gross Unrealized Losses	0	1,898
Estimated Fair Value	309,056	305,935
Cumulative OTTI in AOCI	0	0
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,831	3,404
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	5
Estimated Fair Value	1,830	3,399
Cumulative OTTI in AOCI	0	0
Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	49,275	49,386
Gross Unrealized Gains	651	635
Gross Unrealized Losses	17,917	15,335
Estimated Fair Value	32,009	34,686
Cumulative OTTI in AOCI	25,952	25,952
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	13,337	13,811
Gross Unrealized Gains	294	249
Gross Unrealized Losses	2,373	2,367
Estimated Fair Value	11,258	11,693
Cumulative OTTI in AOCI	0	0
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Amortized Cost	14,995	9,999
Gross Unrealized Gains	92	50
Gross Unrealized Losses	0	0
Estimated Fair Value	15,087	10,049
Cumulative OTTI in AOCI	0	0
Marketable Equity Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	5,890	4,844
Gross Unrealized Gains	665	637
Gross Unrealized Losses	4	26
Estimated Fair Value	6,551	5,455
Cumulative OTTI in AOCI	$ 0	$ 0

Investment Securities - Summa47

Investment Securities - Summary of Securities Available for Sale in an Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 53,973	$ 288,156
Less than 12 months, Unrealized Losses	821	2,983
12 months or longer, Fair Value	31,891	41,608
12 months or longer, Unrealized Losses	19,620	17,411
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	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
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	16,406	15,550
Less than 12 months, Unrealized Losses	73	51
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Residential Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	31,918	90,004
Less than 12 months, Unrealized Losses	64	707
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	348
Less than 12 months, Unrealized Losses	0	5
12 months or longer, Fair Value	268	0
12 months or longer, Unrealized Losses	9	0
Commercial Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	170,340
Less than 12 months, Unrealized Losses	0	1,650
12 months or longer, Fair Value	0	9,255
12 months or longer, Unrealized Losses	0	248
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	3,399
Less than 12 months, Unrealized Losses	0	5
12 months or longer, Fair Value	1,830	0
12 months or longer, Unrealized Losses	1	0
Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	1,126	3,304
Less than 12 months, Unrealized Losses	187	135
12 months or longer, Fair Value	25,983	28,633
12 months or longer, Unrealized Losses	17,730	15,200
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	4,150	4,225
Less than 12 months, Unrealized Losses	493	404
12 months or longer, Fair Value	3,810	3,720
12 months or longer, Unrealized Losses	1,880	1,963
Marketable Equity Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	373	986
Less than 12 months, Unrealized Losses	4	26
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	$ 0	$ 0

Investment Securities - Summa48

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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales and calls	$ 159,232	$ 51,381	$ 194,231	$ 87,468
Gross realized gains	250	4	256	54
Gross realized losses	$ 4	$ 1	$ 6	$ 5

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	6 Months Ended		96 Months Ended
	Jun. 30, 2016USD ($)Securities	Jun. 30, 2015USD ($)	Dec. 31, 2007USD ($)	Dec. 31, 2015USD ($)
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 20,441,000			$ 20,394,000
Available for sale securities in unrealized loss position | Securities	47
Available for sale securities in portfolio, number | Securities	567
Amortized cost of available for sale securities	$ 1,309,638,000			1,072,340,000
Capitalization of banks, equal to or greater than, in the single-issue trust preferred portfolio	10,000,000,000
Noncredit-related other-than-temporary impairment recognized	$ 26,038,000			26,410,000
New issuance of Preferred Stock estimated			$ 60,000,000,000
Security other-than-temporarily impaired	100.00%
Amortized cost of equity securities	$ 5,890,000
Gross realized gains	0	$ 0
Gross realized losses	0	$ 0
Carrying value of securities pledged	1,243,648,000			986,982,000
TRUP CDOs [Member]
Schedule of Investments [Line Items]
Credit-related other-than-temporary impairment recognized in earnings	34,000
Noncredit-related other-than-temporary impairment recognized	25,952,000			25,952,000
Wells Fargo [Member]
Schedule of Investments [Line Items]
Amortized cost of trust preferred securities	9,919,000
SunTrust Bank [Member]
Schedule of Investments [Line Items]
Amortized cost of trust preferred securities	7,413,000
Royal Bank of Scotland [Member]
Schedule of Investments [Line Items]
Amortized cost of trust preferred securities	$ 975,000
Minimum [Member]
Schedule of Investments [Line Items]
Other-than-temporarily impaired, the collateralization ratios	104.00%
Maximum [Member]
Schedule of Investments [Line Items]
Other-than-temporarily impaired, the collateralization ratios	308.40%
Median [Member]
Schedule of Investments [Line Items]
Other-than-temporarily impaired, the collateralization ratios	156.90%
Weighted Average [Member]
Schedule of Investments [Line Items]
Other-than-temporarily impaired, the collateralization ratios	212.70%
Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	$ 3,004,000
Investment Grade [Member] | TRUP CDOs [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	4,484,000
Below Investment Grade [Member] | TRUP CDOs [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	39,229,000
Split Rated [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	4,643,000
Unrated Bonds [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	5,690,000
Residential Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	64,000			707,000
Amortized cost of available for sale securities	600,988,000			473,109,000
Noncredit-related other-than-temporary impairment recognized	0			0
Agency Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	900,835,000
Commercial Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	0			1,898,000
Amortized cost of available for sale securities	299,847,000			305,990,000
Noncredit-related other-than-temporary impairment recognized	0			0
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	9,000			5,000
Amortized cost of available for sale securities	7,641,000			9,119,000
Credit-related other-than-temporary impairment recognized in earnings	33,000
Non-credit losses recognized during the period	$ 242,000
Number of non agency mortgage backed securities. | Securities	2
Noncredit-related other-than-temporary impairment recognized	$ 86,000			$ 458,000
Residential Mortgage-Backed Securities, Non-agency [Member] | Originated Prior to 2005 [Member]
Schedule of Investments [Line Items]
Percentage of portfolio of non-agency mortgage backed securities with collateral	27.00%
Residential Mortgage-Backed Securities, Non-agency [Member] | Originated in 2006 and 2007 [Member]
Schedule of Investments [Line Items]
Percentage of portfolio of non-agency mortgage backed securities with collateral	73.00%
Residential Mortgage-Backed Securities, Non-agency [Member] | Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	$ 1,516,000
Residential Mortgage-Backed Securities, Non-agency [Member] | Below Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	$ 6,125,000

Investment Securities - Summa50

Investment Securities - Summary of Unrealized Loss Positions of Available for Sale TRUP CDOs and Single Issue Trust Preferred Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Amortized Cost	$ 1,309,638	$ 1,072,340
Fair Value	1,323,709	$ 1,066,334
Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	49,275
Fair Value	32,009
Unrealized Loss	17,266
Senior - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	6,625
Fair Value	5,847
Unrealized Loss	778
Mezzanine - Bank (now in senior position) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	11,352
Fair Value	8,180
Unrealized Loss	3,172
Mezzanine - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	26,091
Fair Value	14,736
Unrealized Loss	11,355
Mezzanine - Bank & Insurance (combination) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	5,207
Fair Value	3,246
Unrealized Loss	1,961
Investment Grade [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	4,484
Investment Grade [Member] | Senior - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	4,484
Investment Grade [Member] | Mezzanine - Bank (now in senior position) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0
Investment Grade [Member] | Mezzanine - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0
Investment Grade [Member] | Mezzanine - Bank & Insurance (combination) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0
Split Rated [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0
Split Rated [Member] | Senior - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0
Split Rated [Member] | Mezzanine - Bank (now in senior position) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0
Split Rated [Member] | Mezzanine - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0
Split Rated [Member] | Mezzanine - Bank & Insurance (combination) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	0
Below Investment Grade [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	44,791
Below Investment Grade [Member] | Senior - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	2,141
Below Investment Grade [Member] | Mezzanine - Bank (now in senior position) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	11,352
Below Investment Grade [Member] | Mezzanine - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	26,091
Below Investment Grade [Member] | Mezzanine - Bank & Insurance (combination) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	$ 5,207

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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Cumulative credit losses, Beginning Balance	$ 23,773	$ 23,773	$ 23,773	$ 23,739
Additional credit losses on securities for which OTTI was previously recognized	33	0	33	34
Reductions during the period for securities for which the amount previously recognized in other comprehensive income was recognized in earnings	(1,644)	0	(1,644)	0
Cumulative credit losses, Ending Balance	$ 22,162	$ 23,773	$ 22,162	$ 23,773

Investment Securities - Summa52

Investment Securities - Summary of Maturities of Securities Available for Sale by Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 98,087	$ 10,448
Due after one year through five years, Amortized Cost	296,081	273,469
Due after five years through ten years, Amortized Cost	212,521	213,274
Due after ten years, Amortized Cost	697,059	570,305
Marketable equity securities, Amortized Cost	5,890	4,844
Amortized Cost	1,309,638	1,072,340
Due in one year or less, Estimated Fair Value	98,129	10,515
Due after one year through five years, Estimated Fair Value	302,838	274,158
Due after five years through ten years, Estimated Fair Value	222,195	216,636
Due after ten years, Estimated Fair Value	693,996	559,570
Marketable equity securities, Estimated Fair Value	6,551	5,455
Total available for sale securities	$ 1,323,709	$ 1,066,334

Investment Securities - Summa53

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Amortized Cost	$ 34,029	$ 39,099
Gross Unrealized Gains	817	887
Gross Unrealized Losses	4,087	3,667
Estimated Fair Value	30,759	36,319
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	5,347	10,425
Gross Unrealized Gains	792	860
Gross Unrealized Losses	0	0
Estimated Fair Value	6,139	11,285
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Amortized Cost	9,322	9,321
Gross Unrealized Gains	18	21
Gross Unrealized Losses	205	253
Estimated Fair Value	9,135	9,089
Residential Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	33	35
Gross Unrealized Gains	7	6
Gross Unrealized Losses	0	0
Estimated Fair Value	40	41
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	19,307	19,298
Gross Unrealized Gains	0	0
Gross Unrealized Losses	3,882	3,414
Estimated Fair Value	15,425	15,884
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 - Summa54

Investment Securities - Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 1,000	$ 5,029
Due after one year through five years, Amortized Cost	8,624	9,672
Due after five years through ten years, Amortized Cost	4,045	4,045
Due after ten years, Amortized Cost	20,360	20,353
Amortized Cost	34,029	39,099
Due in one year or less, Estimated Fair Value	1,000	5,121
Due after one year through five years, Estimated Fair Value	9,432	10,458
Due after five years through ten year, Estimated Fair Value	3,843	3,794
Due after ten years, Estimated Fair Value	16,484	16,946
Estimated Fair Value, Total	$ 30,759	$ 36,319

Loans - Major Classes of Loans

Loans - Major Classes of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Commercial, financial, and agricultural
Total commercial, financial & agricultural	$ 6,237,266	$ 5,426,335
Residential real estate	2,403,466	2,268,685
Construction & land development	1,285,171	1,273,054
Consumer:
Bankcard	12,074	11,653
Other consumer	499,377	419,225
Total Financing Receivables	10,437,354	9,398,952
Owner-Occupied [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	877,393	927,746
Nonowner-Occupied [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	3,675,865	2,896,367
Other Commercial Loans [Member]
Commercial, financial, and agricultural
Total commercial, financial & agricultural	$ 1,684,008	$ 1,602,222

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Loans held for sale	$ 6,226	$ 10,681
Acquired impaired loans from merger	$ 10,437,354	9,398,952
Percentage of acquired impaired loans from merger on total gross loans	1.06%
Recorded investment in acquired impaired loans	$ 160,108	208,765
Directors and Officers [Member]
Related party loans	288,913	$ 241,000
Maximum [Member]
Percentage of acquired impaired loans from merger on total gross loans		1.58%
Loans Acquired with Deteriorated Credit Quality [Member]
Acquired impaired loans from merger	$ 111,137	$ 148,197

Loans - Activity for Accretable

Loans - Activity for Accretable Yield (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)
Loans [Abstract]
Accretable yield at the beginning of the period	$ 12,156
Accretion (including cash recoveries)	(4,636)
Net reclassifications to accretable from non-accretable	2,530
Disposals (including maturities, foreclosures, and charge-offs)	(1,712)
Accretable yield at the end of the period	$ 8,338

Credit Quality - Additional Inf

Credit Quality - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)SecurityLoan	Jun. 30, 2015USD ($)SecurityLoan	Dec. 31, 2015USD ($)
Receivables [Abstract]
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			$ 24,944		$ 23,890
Restructured loans on nonaccrual status	$ 10,682		10,682		11,949
Restructured loans modified by reduction in interest	2,721		2,721
Restructured loan and interest	8,755		8,755
Restructured loans modified by change in terms	13,468		13,468
Restructured loans modified by reduction in interest rate and change in terms		$ 669	1,400	$ 909
Restructured loans modified by change in loan terms amount	1,888		$ 3,322
Number of loans restructured | SecurityLoan			0	0
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
Real estate acquired in foreclosure or other settlement of loans	34,894		$ 34,894		32,228
Recorded investment of consumer mortgage loans	$ 180		$ 180		$ 234

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, 2016USD ($)Contract	Jun. 30, 2015USD ($)Contract	Jun. 30, 2016USD ($)Contract	Jun. 30, 2015USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	1	6	2
Pre-Modification Outstanding Recorded Investment	$ 1,890	$ 669	$ 4,731	$ 909
Post-Modification Outstanding Recorded Investment	$ 1,888	$ 669	$ 4,722	$ 909
Construction & Land Development [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
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	$ 1,190	$ 0	$ 1,190	$ 0
Post-Modification Outstanding Recorded Investment	$ 1,188	$ 0	$ 1,188	$ 0
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	1	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 669	$ 0	$ 669
Post-Modification Outstanding Recorded Investment	$ 0	$ 669	$ 0	$ 669
Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	0	4	1
Pre-Modification Outstanding Recorded Investment	$ 700	$ 0	$ 2,141	$ 240
Post-Modification Outstanding Recorded Investment	$ 700	$ 0	$ 2,134	$ 240
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 1,400	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 1,400	$ 0
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 Ag

Credit Quality - Schedule of Age Analysis of its Past Due Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	$ 81,189	$ 103,765
Loans, Total Past Due	179,974	218,531
Loans, Current & Other	10,257,380	9,180,421
Total Financing Receivables	10,437,354	9,398,952
Loans, Recorded Investment >90 Days & Accruing	5,594	11,628
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	98,785	114,766
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	9,191	2,412
Loans, Total Past Due	20,624	17,828
Loans, Current & Other	1,264,547	1,255,226
Total Financing Receivables	1,285,171	1,273,054
Loans, Recorded Investment >90 Days & Accruing	37	1,347
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	11,433	15,416
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	8,422	8,639
Loans, Total Past Due	17,250	18,470
Loans, Current & Other	860,143	909,276
Total Financing Receivables	877,393	927,746
Loans, Recorded Investment >90 Days & Accruing	0	400
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	8,828	9,831
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	10,699	24,209
Loans, Total Past Due	28,387	50,335
Loans, Current & Other	3,647,478	2,846,032
Total Financing Receivables	3,675,865	2,896,367
Loans, Recorded Investment >90 Days & Accruing	0	552
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	17,688	26,126
Other Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	11,090	14,888
Loans, Total Past Due	47,292	48,185
Loans, Current & Other	1,636,716	1,554,037
Total Financing Receivables	1,684,008	1,602,222
Loans, Recorded Investment >90 Days & Accruing	699	3,643
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	36,202	33,297
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	32,796	44,312
Loans, Total Past Due	55,814	72,644
Loans, Current & Other	2,347,652	2,196,041
Total Financing Receivables	2,403,466	2,268,685
Loans, Recorded Investment >90 Days & Accruing	3,463	4,294
Residential Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	23,018	28,332
Consumer [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	331	223
Loans, Total Past Due	434	391
Loans, Current & Other	11,640	11,262
Total Financing Receivables	12,074	11,653
Loans, Recorded Investment >90 Days & Accruing	103	168
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	103	168
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	8,660	9,082
Loans, Total Past Due	10,173	10,678
Loans, Current & Other	489,204	408,547
Total Financing Receivables	499,377	419,225
Loans, Recorded Investment >90 Days & Accruing	1,292	1,224
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	$ 1,513	$ 1,596

Credit Quality - Schedule of 61

Credit Quality - Schedule of Age Analysis of its Past Due Loans, Segregated by Class of Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	$ 10,437,354	$ 9,398,952
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	111,137	148,197
Loans and Debt Securities Acquired with Deteriorated Credit Quality [Member] | Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	$ 111,137	$ 148,197

Credit Quality - Schedule of No

Credit Quality - Schedule of Nonaccrual Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	$ 93,191	$ 103,138
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	11,396	14,069
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	8,828	9,431
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	17,688	25,574
Other Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	35,503	29,654
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans on Nonaccrual Status	19,555	24,038
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	$ 221	$ 372

Credit Quality - Schedule of Cr

Credit Quality - Schedule of Credit Quality Indicators Information, by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	$ 10,437,354	$ 9,398,952
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,403,466	2,268,685
Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,684,008	1,602,222
Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	12,074	11,653
Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	499,377	419,225
Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	877,393	927,746
Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	3,675,865	2,896,367
Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,285,171	1,273,054
Pass [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,336,352	2,195,420
Pass [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,538,941	1,436,670
Pass [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	11,640	11,262
Pass [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	488,943	408,271
Pass [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	760,312	835,082
Pass [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	3,522,786	2,710,504
Pass [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,127,373	1,095,238
Special Mention [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	20,667	13,494
Special Mention [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	26,435	26,148
Special Mention [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	331	223
Special Mention [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	8,769	9,188
Special Mention [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	38,739	20,391
Special Mention [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	31,690	32,249
Special Mention [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	55,444	59,100
Substandard [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	46,008	57,981
Substandard [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	115,922	136,585
Substandard [Member] | Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	103	168
Substandard [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,665	1,766
Substandard [Member] | Owner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	78,342	72,273
Substandard [Member] | Nonowner-Occupied [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	121,389	153,614
Substandard [Member] | Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	102,234	118,716
Doubtful [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	439	1,790
Doubtful [Member] | Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,710	2,819
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	$ 120	$ 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, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Construction & Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	$ 21,891		$ 21,891	$ 28,245
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	24,105		24,105	29,953
Impaired Loans, Recorded Investment, With an allowance recorded	11,273		11,273	14,132
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	14,331		14,331	20,135
Impaired Loans, Related Allowance	4,939		4,939	4,789
Impaired Loans, Recorded Investment	33,164		33,164	42,377
Impaired Loans, Unpaid Principal Balance	38,436		38,436	50,088
Impaired Loans, Related Allowance	4,939		4,939	4,789
Impaired Loans, Average Recorded Investment, With no related allowance recorded	22,838	$ 36,722	25,916		$ 45,541
Impaired Loans, Interest Income Recognized, With no related allowance recorded	40	80	67		159
Impaired Loans, Average Recorded Investment, With an allowance recorded	11,919	10,740	12,994		10,833
Impaired Loans, Interest Income Recognized, With an allowance recorded	48	58	90		92
Impaired Loans, Average Recorded Investment	34,757		38,910	47,462	56,374
Impaired Loans, Interest Income Recognized	88		157	138	251
Bankcard [Member]
Financing Receivable, Impaired [Line Items]
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
Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Average Recorded Investment, With no related allowance recorded	33	35	34		40
Impaired Loans, Interest Income Recognized, With no related allowance recorded	0	0	0		0
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	26,557		26,557	36,615
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	27,090		27,090	36,828
Impaired Loans, Recorded Investment, With an allowance recorded	4,915		4,915	4,555
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	4,915		4,915	4,555
Impaired Loans, Related Allowance	1,712		1,712	1,253
Impaired Loans, Recorded Investment	31,472		31,472	41,170
Impaired Loans, Unpaid Principal Balance	32,005		32,005	41,383
Impaired Loans, Related Allowance	1,712		1,712	1,253
Impaired Loans, Average Recorded Investment, With no related allowance recorded	27,267	43,898	33,221		40,294
Impaired Loans, Interest Income Recognized, With no related allowance recorded	125	117	184		179
Impaired Loans, Average Recorded Investment, With an allowance recorded	4,552	4,789	4,564		4,936
Impaired Loans, Interest Income Recognized, With an allowance recorded	30	20	57		58
Impaired Loans, Average Recorded Investment	31,819		37,785	48,687	45,230
Impaired Loans, Interest Income Recognized	155		241	137	237
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	59,080		59,080	69,053
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	59,575		59,575	69,517
Impaired Loans, Recorded Investment, With an allowance recorded	10,800		10,800	7,890
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	10,800		10,800	7,890
Impaired Loans, Related Allowance	1,716		1,716	1,362
Impaired Loans, Recorded Investment	69,880		69,880	76,943
Impaired Loans, Unpaid Principal Balance	70,375		70,375	77,407
Impaired Loans, Related Allowance	1,716		1,716	1,362
Impaired Loans, Average Recorded Investment, With no related allowance recorded	62,049	66,936	66,395		61,290
Impaired Loans, Interest Income Recognized, With no related allowance recorded	186	354	393		517
Impaired Loans, Average Recorded Investment, With an allowance recorded	8,615	6,847	8,507		7,112
Impaired Loans, Interest Income Recognized, With an allowance recorded	195	7	238		46
Impaired Loans, Average Recorded Investment	70,664		74,902	73,783	68,402
Impaired Loans, Interest Income Recognized	381		631	361	563
Other Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	22,654		22,654	30,433
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	24,889		24,889	32,158
Impaired Loans, Recorded Investment, With an allowance recorded	35,486		35,486	29,486
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	36,786		36,786	33,127
Impaired Loans, Related Allowance	16,617		16,617	18,269
Impaired Loans, Recorded Investment	58,140		58,140	59,919
Impaired Loans, Unpaid Principal Balance	61,675		61,675	65,285
Impaired Loans, Related Allowance	16,617		16,617	18,269
Impaired Loans, Average Recorded Investment, With no related allowance recorded	25,816	35,659	27,861		32,580
Impaired Loans, Interest Income Recognized, With no related allowance recorded	124	140	224		240
Impaired Loans, Average Recorded Investment, With an allowance recorded	37,584	19,764	34,134		19,083
Impaired Loans, Interest Income Recognized, With an allowance recorded	98	154	228		218
Impaired Loans, Average Recorded Investment	63,400		61,995	55,423	51,663
Impaired Loans, Interest Income Recognized	222		452	294	458
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	27,833		27,833	21,431
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	29,420		29,420	22,329
Impaired Loans, Recorded Investment, With an allowance recorded	4,034		4,034	13,305
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	4,769		4,769	14,625
Impaired Loans, Related Allowance	898		898	2,118
Impaired Loans, Recorded Investment	31,867		31,867	34,736
Impaired Loans, Unpaid Principal Balance	34,189		34,189	36,954
Impaired Loans, Related Allowance	898		898	2,118
Impaired Loans, Average Recorded Investment, With no related allowance recorded	28,074	30,867	26,872		31,912
Impaired Loans, Interest Income Recognized, With no related allowance recorded	97	97	237		146
Impaired Loans, Average Recorded Investment, With an allowance recorded	8,174	7,119	9,339		6,692
Impaired Loans, Interest Income Recognized, With an allowance recorded	19	18	25		29
Impaired Loans, Average Recorded Investment	36,248		36,211	37,986	38,604
Impaired Loans, Interest Income Recognized	116		262	115	175
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 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	39		39	32
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	39		39	32
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	39		39	32
Impaired Loans, Unpaid Principal Balance	39		39	32
Impaired Loans, Related Allowance	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	33		34	35	40
Impaired Loans, Interest Income Recognized	$ 0		$ 0	$ 0	$ 0

Allowance for Credit Losses - A

Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Specific loss allocations are calculated for loans in excess			$ 500
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	$ 1,728	$ 668	$ 1,290	$ 4,032
Reserve for lending-related commitments	$ 1,394		$ 1,394		$ 936
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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	$ 75,490		$ 75,726	$ 75,529	$ 75,529
Charge-offs	11,987		18,933		25,499
Recoveries	1,278		3,953		3,122
Provision	7,667	$ 5,716	11,702	11,070	22,574
Allowance for Loan Losses Ending balance	72,448		72,448		75,726
Allowance for Loan Losses, individually evaluated for impairment	25,882		25,882		27,792
Allowance for Loan Losses, collectively evaluated for impairment	46,566		46,566		47,934
Financing receivables	10,437,354		10,437,354		9,398,952
Financing receivables, individually evaluated for impairment	107,737		107,737		107,725
Financing receivables, collectively evaluated for impairment	10,218,480		10,218,480		9,143,030
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0		0		0
Financing receivables	111,137		111,137		148,197
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	15,266		18,205	19,402	19,402
Charge-offs	1,429		1,429		862
Recoveries	195		254		511
Provision	(642)		(3,640)		(846)
Allowance for Loan Losses Ending balance	13,390		13,390		18,205
Allowance for Loan Losses, individually evaluated for impairment	4,939		4,939		4,789
Allowance for Loan Losses, collectively evaluated for impairment	8,451		8,451		13,416
Financing receivables	1,285,171		1,285,171		1,273,054
Financing receivables, individually evaluated for impairment	13,822		13,822		15,779
Financing receivables, collectively evaluated for impairment	1,244,595		1,244,595		1,221,760
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	26,754		26,754		35,515
Allowance for Estimated Imprecision [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	215		104	70	70
Charge-offs	0		0		0
Recoveries	0		0		0
Provision	143		254		34
Allowance for Loan Losses Ending balance	358		358		104
Allowance for Loan Losses, individually evaluated for impairment	0		0		0
Allowance for Loan Losses, collectively evaluated for impairment	358		358		104
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	5,348		3,637	4,041	4,041
Charge-offs	1,328		2,673		4,755
Recoveries	588		1,369		829
Provision	2,346		4,621		3,522
Allowance for Loan Losses Ending balance	6,954		6,954		3,637
Allowance for Loan Losses, individually evaluated for impairment	1,712		1,712		1,253
Allowance for Loan Losses, collectively evaluated for impairment	5,242		5,242		2,384
Financing receivables	877,393		877,393		927,746
Financing receivables, individually evaluated for impairment	15,034		15,034		12,670
Financing receivables, collectively evaluated for impairment	848,843		848,843		888,802
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	13,517		13,517		26,274
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	6,201		5,309	8,167	8,167
Charge-offs	45		408		1,120
Recoveries	122		626		74
Provision	449		1,200		(1,812)
Allowance for Loan Losses Ending balance	6,727		6,727		5,309
Allowance for Loan Losses, individually evaluated for impairment	1,716		1,716		1,362
Allowance for Loan Losses, collectively evaluated for impairment	5,011		5,011		3,947
Financing receivables	3,675,865		3,675,865		2,896,367
Financing receivables, individually evaluated for impairment	19,648		19,648		26,152
Financing receivables, collectively evaluated for impairment	3,611,531		3,611,531		2,817,748
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	44,685		44,685		52,467
Other Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	32,640		31,328	26,931	26,931
Charge-offs	7,364		11,118		10,042
Recoveries	29		1,009		714
Provision	5,052		9,138		13,725
Allowance for Loan Losses Ending balance	30,357		30,357		31,328
Allowance for Loan Losses, individually evaluated for impairment	16,617		16,617		18,269
Allowance for Loan Losses, collectively evaluated for impairment	13,740		13,740		13,059
Financing receivables	1,684,008		1,684,008		1,602,222
Financing receivables, individually evaluated for impairment	44,388		44,388		35,342
Financing receivables, collectively evaluated for impairment	1,625,065		1,625,065		1,546,018
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	14,555		14,555		20,862
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	13,547		15,148	13,835	13,835
Charge-offs	1,136		1,845		6,411
Recoveries	236		447		495
Provision	(542)		(1,645)		7,229
Allowance for Loan Losses Ending balance	12,105		12,105		15,148
Allowance for Loan Losses, individually evaluated for impairment	898		898		2,119
Allowance for Loan Losses, collectively evaluated for impairment	11,207		11,207		13,029
Financing receivables	2,403,466		2,403,466		2,268,685
Financing receivables, individually evaluated for impairment	14,845		14,845		17,782
Financing receivables, collectively evaluated for impairment	2,377,034		2,377,034		2,237,865
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	11,587		11,587		13,038
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	2,273		1,995	$ 3,083	3,083
Charge-offs	685		1,460		2,309
Recoveries	108		248		499
Provision	861		1,774		722
Allowance for Loan Losses Ending balance	2,557		2,557		1,995
Allowance for Loan Losses, individually evaluated for impairment	0		0		0
Allowance for Loan Losses, collectively evaluated for impairment	2,557		2,557		1,995
Financing receivables	511,451		511,451		430,878
Financing receivables, individually evaluated for impairment	0		0		0
Financing receivables, collectively evaluated for impairment	511,412		511,412		430,837
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	$ 39		$ 39		$ 41

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill not subject to amortization	$ 866,176	$ 710,252
Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	71,983	60,577
Accumulated Amortization	(44,400)	(42,737)
Net Carrying Amount	$ 27,583	$ 17,840

Intangible Assets - Reconciliat

Intangible Assets - Reconciliation of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Beginning Balance	$ 710,252
Preliminary addition to goodwill from Bank of Georgetown acquisition	155,924
Goodwill, Ending Balance	$ 866,176

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Intangible Liability Disclosure [Abstract]
Amortization expense on intangible assets	$ 919	$ 855	$ 1,664	$ 1,710

Intangible Assets - Schedule of

Intangible Assets - Schedule of Anticipated Amortization Expense (Detail) $ in Thousands	Jun. 30, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 4,193
2,017	4,559
2,018	4,000
2,019	3,703
2020 and thereafter	$ 12,791

Short-Term Borrowings - Additio

Short-Term Borrowings - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Unused lines of credit	$ 264,000,000
Federal funds purchased	8,300,000	$ 22,230,000
Repurchase agreements	377,146,000
Wholesale REPO	$ 50,123,000
Maturity date of wholesale REPO	2018-05
Unrelated Financial Institution [Member]
Short-term Debt [Line Items]
Unused lines of credit	$ 20,000,000
Renewal period of line of credit	360 days
Amount of outstanding balance under line of credit	$ 0

Long-Term Borrowings - Addition

Long-Term Borrowings - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016USD ($)Trust	Dec. 31, 2015USD ($)	Dec. 31, 2009USD ($)
Debt Instrument [Line Items]
Unused borrowing amount	$ 1,947,887,000
FHLB advances	$ 1,295,829,000	$ 850,880,000
FHLB advances, weighted-average interest rate	0.59%
FHLB advances, maximum maturity period	9 years
Overnight funds	$ 400,000,000
Acquisition accounting adjustment to fair value, interest rate	0.48%
Number of statutory business trusts | Trust	13
Outstanding balances of debentures	$ 223,940,000	$ 223,506,000
Maximum time to defer payment of interest on subordinate debt	5 years
Trust Preferred Securities limit percentage	25.00%
Maximum [Member]
Debt Instrument [Line Items]
Tier 1 risk based assets			$ 15,000,000,000
Capital Securities [Member]
Debt Instrument [Line Items]
Number of statutory business trusts | Trust	13

Long -Term Borrowings - Schedul

Long -Term Borrowings - Schedule of Maturities of FHLB Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
2,016	$ 995,589
2,017	230,240
2,018	10,000
2,019	35,000
2020 and thereafter	25,000
Total	$ 1,295,829	$ 850,880

Commitments and Contingent Li74

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Loan commitments outstanding	$ 2,596,914	$ 2,587,957
Loan commitments expiry period	1 year
Commercial Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	$ 11	226
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	$ 122,597	$ 135,146

Derivative Financial Instrume75

Derivative Financial Instruments - Schedule of Derivative Instruments (Detail)	6 Months Ended
	Jun. 30, 2016USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Used for Interest Rate Risk Management and Designated as Hedges	$ 96,500,000
Average Pay Rate	3.64%
Fair Value Hedging [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount, Pay Fixed Swaps (Hedging Commercial Loans)	$ 96,500,000
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount, Pay Fixed Swaps (Hedging Commercial Loans)	$ 96,500,000

Derivative Financial Instrume76

Derivative Financial Instruments - Schedule of Fair Value Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Asset derivatives designated as hedging instruments	$ 0	$ 0
Asset derivatives not designated as hedging instruments	2,515	2,942
Total asset derivatives	2,515	2,942
Liability derivatives designated as hedging instruments	7,458	1,179
Liability derivatives not designated as hedging instruments	2,515	2,942
Total liability derivatives	9,973	4,121
Interest Rate Contracts [Member] | Other Assets [Member]
Derivative [Line Items]
Asset derivatives designated as hedging instruments	0	0
Asset derivatives not designated as hedging instruments	2,515	2,942
Interest Rate Contracts [Member] | Other Liabilities [Member]
Derivative [Line Items]
Liability derivatives designated as hedging instruments	7,458	1,179
Liability derivatives not designated as hedging instruments	$ 2,515	$ 2,942

Derivative Financial Instrume77

Derivative Financial Instruments - Schedule of Derivative Financial Instruments on Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Interest Rate Contracts [Member]
Derivative [Line Items]
Derivatives in fair value hedging relationships	$ (249)	$ 96	$ 32	$ (328)
Interest Income/ (Expense) [Member]
Derivative [Line Items]
Derivatives in fair value hedging relationships	(249)	96	32	(328)
Interest Income/ (Expense) [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivatives in fair value hedging relationships	(249)	96	32	(328)
Other Income [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative instruments not designated as hedging instruments, loss	0	0	0	0
Derivative instruments not designated as hedging instruments, net	$ 0	$ 0	$ 0	$ 0

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rates utilized, minimum	4.25%
Discount rates utilized, maximum	12.50%
Amount of decrease in fair value of securities	$ 4,760,000
Transfers from Level 1 to Level 2 for financial assets	0	$ 0
Transfers from Level 2 to Level 1 for financial assets	0	0
Transfers from Level 1 to Level 2 for financial liabilities	0	0
Transfers from Level 2 to Level 1 for financial liabilities	0	$ 0
Nonrecurring fair value adjustments on loans held for sale	0
Fair value measurement of intangible assets	$ 0		$ 0
Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Decrease in fair value of securities	15.00%
Increase in discount rates, basis point	2.00%

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	$ 6,551	$ 5,455
Total available for sale securities	1,323,709	1,066,334
Derivative financial assets	2,515	2,942
Derivative financial liabilities	9,973	4,121
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	1,317,158	1,060,879
Available for sale equity securities	6,551	5,455
Total available for sale securities	1,323,709	1,066,334
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	153,576	73,786
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	153,576	73,786
State and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	170,793	133,778
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	170,793	133,778
Residential Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	615,741	477,982
Residential Mortgage-Backed Securities, Agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	615,741	477,982
Residential Mortgage-Backed Securities, Non-agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	7,808	9,571
Residential Mortgage-Backed Securities, Non-agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	7,808	9,571
Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	1,830	3,399
Asset-Backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	1,830	3,399
Commercial Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	309,056	305,935
Commercial Mortgage-Backed Securities, Agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	309,056	305,935
Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	32,009	34,686
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	32,009	34,686
Single Issue Trust Preferred Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	11,258	11,693
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	11,258	11,693
Corporate Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	15,087	10,049
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	15,087	10,049
Financial Services Industry [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	3,652	2,723
Other Equity Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	1,164	1,136
Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	2,515	2,942
Derivative financial liabilities	9,973	4,121
Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	1,735	1,596
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	3,716	3,532
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	0	0
Available for sale equity securities	3,716	3,532
Total available for sale securities	3,716	3,532
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, Agency [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, Non-agency [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] | 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] | Commercial Mortgage-Backed Securities, Agency [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	0	0
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	817	800
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	1,164	1,136
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	0	0
Derivative financial liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	1,735	1,596
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	1,287,984	1,028,116
Derivative financial assets	2,515	2,942
Derivative financial liabilities	9,973	4,121
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	1,285,149	1,026,193
Available for sale equity securities	2,835	1,923
Total available for sale securities	1,287,984	1,028,116
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	153,576	73,786
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	170,793	133,778
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage-Backed Securities, Agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	615,741	477,982
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage-Backed Securities, Non-agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	7,808	9,571
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	1,830	3,399
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage-Backed Securities, Agency [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	309,056	305,935
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	11,258	11,693
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	15,087	10,049
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	2,835	1,923
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] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	2,515	2,942
Derivative financial liabilities	9,973	4,121
Significant Other Observable Inputs (Level 2) [Member] | Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	32,009	34,686
Derivative financial assets	0	0
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	32,009	34,686
Available for sale equity securities	0	0
Total available for sale securities	32,009	34,686
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, Agency [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, Non-agency [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] | 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] | Commercial Mortgage-Backed Securities, Agency [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	32,009	34,686
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] | Interest Rate Contracts [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	0	0
Derivative financial liabilities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity Mutual Funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	$ 0	$ 0

Fair Value Measurements - Sch80

Fair Value Measurements - Schedule of Additional Information about Financial Assets and Liabilities Measured at Fair Value Utilized Level 3 (Detail) - Trust Preferred Collateralized Debt Obligations [Member] - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	$ 34,686	$ 39,558
Included in earnings (or changes in net assets)	0	(34)
Included in other comprehensive income	(2,677)	(4,838)
Purchases, issuances, and settlements	0	0
Transfers in and/or out of Level 3	0	0
Balance, end of period	32,009	34,686
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 Values of Financial Instru

Fair Values of Financial Instruments - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
YTD Losses, Impaired Loans	$ 3,915	$ 8,485
YTD Losses, OREO	1,865	1,141
Impaired Loans	66,508	69,368
OREO	34,894	32,228
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Loans	0	0
OREO	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Loans	20,003	29,186
OREO	34,628	32,228
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Loans		40,182
OREO	$ 266	$ 0

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 1,101,469	$ 857,335
Securities available for sale	1,323,709	1,066,334
Securities held to maturity	34,029	39,099
Other securities	125,413	98,749
Loans held for sale	6,226	10,681
Loans	10,422,858	9,384,080
Derivative financial assets	2,515	2,942
Deposits	10,315,853	9,341,527
Derivative financial liabilities	9,973	4,121
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,101,469	857,335
Securities available for sale	1,323,709	1,066,334
Securities held to maturity	34,029	39,099
Other securities	125,413	98,749
Loans held for sale	6,226	10,681
Loans	10,350,410	9,308,354
Derivative financial assets	2,515	2,942
Deposits	10,315,853	9,341,527
Short-term borrowings	735,323	423,028
Long-term borrowings	1,169,892	1,015,249
Derivative financial liabilities	9,973	4,121
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,101,469	857,335
Securities available for sale	1,323,709	1,066,334
Securities held to maturity	30,759	36,320
Other securities	119,143	93,811
Loans held for sale	6,226	10,681
Loans	10,410,066	9,289,463
Derivative financial assets	2,515	2,942
Deposits	10,300,805	9,332,451
Short-term borrowings	735,323	423,028
Long-term borrowings	1,141,151	988,270
Derivative financial liabilities	9,973	4,121
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	3,716	3,532
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
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,101,469	857,335
Securities available for sale	1,287,984	1,028,116
Securities held to maturity	27,739	33,300
Other securities	0	0
Loans held for sale	6,226	10,681
Loans	0	0
Derivative financial assets	2,515	2,942
Deposits	10,300,805	9,332,451
Short-term borrowings	735,323	423,028
Long-term borrowings	1,141,151	988,270
Derivative financial liabilities	9,973	4,121
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	32,009	34,686
Securities held to maturity	3,020	3,020
Other securities	119,143	93,811
Loans held for sale	0	0
Loans	10,410,066	9,289,463
Derivative financial assets	0	0
Deposits	0	0
Short-term borrowings	0	0
Long-term borrowings	0	0
Derivative financial liabilities	$ 0	$ 0

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	May 18, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
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		$ 672	$ 757	$ 1,330	$ 1,388
Number of share available for grant for prior plans		0		0
Maximum term for awards granted (years)				10 years
Shares issued related stock option exercises				105,010	147,419
Total intrinsic value of options exercised				$ 1,774	$ 1,100
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options granted				967,285
Number of shares granted				289,637

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Stock Option Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jun. 03, 2016	Jun. 30, 2016	Jun. 30, 2015
Schedule Of Stock Options [Line Items]
Shares, Outstanding, Beginning balance		1,207,110
Shares, Granted		189,780
Shares, Exercised		(105,010)	(147,419)
Shares, Forfeited or expired		(14,666)
Shares, Outstanding, Ending balance		1,838,784
Shares, Exercisable at June 30, 2016		1,396,367
Aggregate Intrinsic Value, Outstanding at June 30, 2016		$ 20,822
Aggregate Intrinsic Value, Exercisable at June 30, 2016		$ 19,126
Weighted Average Remaining Contractual Term, Outstanding at June 30, 2016		6 years 1 month 6 days
Weighted Average Remaining Contractual Term, Exercisable at June 30, 2016		5 years 2 months 12 days
Weighted Average Exercise Price, Outstanding, Beginning balance		$ 28.15
Weighted Average Exercise Price, Granted		19.66
Weighted Average Exercise Price, Exercised		17.90
Weighted Average Exercise Price, Forfeited or expired		31.37
Weighted Average Exercise Price, Outstanding, Ending balance		26.19
Weighted Average Exercise Price, Exercisable		$ 23.81
Bank of Georgetown [Member]
Schedule Of Stock Options [Line Items]
Assumed in Bank of Georgetown merger	6,527,746	561,570
Weighted Average Exercise Price, Exercisable		$ 35.04

Stock Based Compensation - Stat

Stock Based Compensation - Status of United's Nonvested Stock Option Awards (Detail)	6 Months Ended
	Jun. 30, 2016$ / sharesshares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Nonvested, Beginning balance | shares	426,395
Shares, Granted | shares	189,780
Shares, Vested | shares	(162,183)
Shares, Forfeited or expired | shares	(11,575)
Shares, Nonvested, Ending balance | shares	442,417
Weighted-Average Grant Date Fair Value Per Share, Nonvested Beginning balance | $ / shares	$ 6.68
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	6.97
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	6.59
Weighted-Average Grant Date Fair Value Per Share, Forfeited or expired | $ / shares	6.83
Weighted-Average Grant Date Fair Value Per Share, Nonvested Ending balance | $ / shares	$ 6.83

Stock Based Compensation - Chan

Stock Based Compensation - Changes to United's Restricted Common Shares (Detail) - Restricted Stock [Member]	6 Months Ended
	Jun. 30, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning balance | shares	129,772
Shares, Granted | shares	64,092
Shares, Vested | shares	(49,179)
Shares, Forfeited | shares	(3,793)
Number of Shares, Outstanding, Ending balance | shares	140,892
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Beginning balance | $ / shares	$ 31.69
Weighted-Average Grant Date Fair Value Per Share, Granted | $ / shares	35.04
Weighted-Average Grant Date Fair Value Per Share, Vested | $ / shares	30.51
Weighted-Average Grant Date Fair Value Per Share, Forfeited | $ / shares	32.44
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Ending balance | $ / shares	$ 33.60

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)
Compensation and Retirement Disclosure [Abstract]
Unrecognized actuarial gains (losses), before tax	$ (55,998)
Unrecognized actuarial gains (losses), net of tax	(35,727)
Amortization expected to be recognized	4,618
Amortization expected to be recognized, net of tax	$ 2,946

Employee Benefit Plans - Net Pe

Employee Benefit Plans - Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 608	$ 748	$ 1,215	$ 1,488
Interest cost	1,456	1,446	2,912	2,876
Expected return on plan assets	(2,012)	(2,319)	(4,024)	(4,612)
Recognized net actuarial loss	1,149	1,222	2,297	2,430
Net periodic pension (benefit) cost	$ 1,201	$ 1,097	$ 2,400	$ 2,182
Weighted-Average Assumptions:
Discount rate	4.75%	4.35%	4.75%	4.35%
Expected return on assets	7.25%	7.50%	7.25%	7.50%
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	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Liability of unrecognized tax benefits	$ 2,203
Estimate of unrecognized tax benefits, reasonable possible	United cannot reasonably estimate the amount of tax benefits it may recognize over the next 12 months.
Accrued interest related to uncertain tax positions	$ 772	$ 728

Comprehensive Income - Componen

Comprehensive Income - Components of Total Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 31,792	$ 34,809	$ 66,498	$ 69,436
AFS securities with OTTI charges during the period	(77)	0	(77)	(100)
Related income tax effect	28	0	28	36
Income tax rate change	0	316	0	316
Less : OTTI charges recognized in net income	33	0	33	34
Related income tax benefit	(12)	0	(12)	(12)
Reclassification of previous noncredit OTTI to credit OTTI	415	0	415	0
Related income tax benefit	(150)	0	(150)	0
Net unrealized (losses) gains on AFS securities with OTTI	237	316	237	274
Change in net unrealized gain on AFS securities arising during the period	6,638	(10,053)	19,955	(1,582)
Related income tax effect	(2,403)	3,639	(7,224)	573
Net reclassification adjustment for (gains) losses included in net income	(246)	(3)	(250)	(49)
Related income tax expense (benefit)	90	1	91	18
Total AFS securities - all other	4,079	(6,416)	12,572	(1,040)
Net effect of AFS securities on other comprehensive income	4,316	(6,100)	12,809	(766)
Accretion on the unrealized loss for securities transferred from AFS to the HTM investment portfolio prior to call or maturity	3	4	4	5
Related income tax expense	(2)	(2)	(2)	(2)
Net effect of HTM securities on other comprehensive income	1	2	2	3
Pension plan:
Recognized net actuarial loss	1,149	1,222	2,297	2,430
Related income tax benefit	(420)	(454)	(839)	(894)
Net effect of change in pension plan asset on other comprehensive income	729	768	1,458	1,536
Net current-period other comprehensive income, net of tax	5,046	(5,330)	14,269	773
Total Comprehensive Income	$ 36,838	$ 29,479	$ 80,767	$ 70,209

Comprehensive Income - Compon91

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at January 1, 2016			$ 1,712,635
Net current-period other comprehensive income, net of tax	$ 5,046	$ (5,330)	14,269	$ 773
Balance at June 30, 2016	2,013,140		2,013,140
Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at January 1, 2016			(35,640)
Other comprehensive income before reclassification			0
Amounts reclassified from accumulated other comprehensive income			1,458
Net current-period other comprehensive income, net of tax			1,458
Balance at June 30, 2016	(34,182)		(34,182)
Unrealized Gains/Losses on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at January 1, 2016			(2,515)
Other comprehensive income before reclassification			12,703
Amounts reclassified from accumulated other comprehensive income			106
Net current-period other comprehensive income, net of tax			12,809
Balance at June 30, 2016	10,294		10,294
Accumulated Unrealized Loss On Securities Available For Sale Transferred To Held To Maturity [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at January 1, 2016			(57)
Other comprehensive income before reclassification			2
Amounts reclassified from accumulated other comprehensive income			0
Net current-period other comprehensive income, net of tax			2
Balance at June 30, 2016	(55)		(55)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at January 1, 2016			(38,212)
Other comprehensive income before reclassification			12,705
Amounts reclassified from accumulated other comprehensive income			1,564
Net current-period other comprehensive income, net of tax			14,269
Balance at June 30, 2016	$ (23,943)		$ (23,943)

Comprehensive Income - Reclassi

Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Available for sale ("AFS") securities:
Net reclassification adjustment for losses (gains) included in net income	$ 246	$ 3	$ 250	$ 49
Income before income taxes	48,170	51,954	100,755	101,885
Related income tax effect	(16,378)	(17,145)	(34,257)	(32,449)
Net earnings allocated to common shareholders	31,792	34,809	66,498	69,436
Pension plan:
Recognized net actuarial loss	1,149	1,222	2,297	2,430
Income before income taxes	48,170	51,954	100,755	101,885
Related income tax effect	(16,378)	(17,145)	(34,257)	(32,449)
Net earnings allocated to common shareholders	$ 31,792	$ 34,809	66,498	$ 69,436
Reclassification out of Accumulated Other Comprehensive Income [Member]
Available for sale ("AFS") securities:
Net earnings allocated to common shareholders			1,564
Pension plan:
Net earnings allocated to common shareholders			1,564
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			415
Net reclassification adjustment for losses (gains) included in net income			(250)
Income before income taxes			165
Related income tax effect			(59)
Net earnings allocated to common shareholders			106
Pension plan:
Income before income taxes			165
Related income tax effect			(59)
Net earnings allocated to common shareholders			106
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Available for sale ("AFS") securities:
Income before income taxes			2,297
Related income tax effect			(839)
Net earnings allocated to common shareholders			1,458
Pension plan:
Recognized net actuarial loss			2,297
Income before income taxes			2,297
Related income tax effect			(839)
Net earnings allocated to common shareholders			$ 1,458

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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Distributed earnings allocated to common stock	$ 25,114	$ 22,189	$ 48,068	$ 44,356
Undistributed earnings allocated to common stock	6,623	12,558	18,311	24,957
Net earnings allocated to common shareholders	$ 31,737	$ 34,747	$ 66,379	$ 69,313
Average common shares outstanding	71,483,703	69,305,612	70,490,596	69,256,831
Equivalents from stock options	325,318	281,805	276,368	275,008
Average diluted shares outstanding	71,809,021	69,587,417	70,766,964	69,531,839
Earnings per basic common share	$ 0.44	$ 0.50	$ 0.94	$ 1
Earnings per diluted common share	$ 0.44	$ 0.50	$ 0.94	$ 1

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016Trust
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]
Number of statutory business trusts	13
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, 2016USD ($)
Century Trust [Member]
Variable Interest Entity [Line Items]
Issuance Date	Mar. 23, 2000
Amount of Capital Securities Issued	$ 8,800
Interest Rate	10.875% Fixed
Maturity Date	Mar. 8, 2030
United Statutory Trust III [Member]
Variable Interest Entity [Line Items]
Issuance Date	Dec. 17, 2003
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]
Issuance Date	Jul. 12, 2007
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]
Issuance Date	May 16, 2005
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]
Issuance Date	Jun. 20, 2006
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]
Issuance Date	Jun. 15, 2006
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

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, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Aggregate Assets	$ 240,563	$ 240,468
Aggregate Liabilities	232,536	232,492
Risk Of Loss	$ 8,027	$ 7,976