United Bankshares (UBSI) 10-Q 5 Aug 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
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		69,537,066

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 173,601	$ 175,713
Interest-bearing deposits with other banks	742,778	576,630
Federal funds sold	722	721
Total cash and cash equivalents	917,101	753,064
Securities available for sale at estimated fair value (amortized cost-$1,127,640 at June 30, 2015 and $1,180,016 at December 31, 2014)	1,126,809	1,180,386
Securities held to maturity (estimated fair value-$36,700 at June 30, 2015 and $36,784 at December 31, 2014)	39,050	39,310
Other investment securities	92,456	96,344
Loans held for sale	14,856	8,680
Loans	9,097,301	9,119,492
Less: Unearned income	(15,197)	(14,840)
Loans net of unearned income	9,082,104	9,104,652
Less: Allowance for loan losses	(75,215)	(75,529)
Net loans	9,006,889	9,029,123
Bank premises and equipment	74,430	77,520
Goodwill	710,252	709,794
Accrued interest receivable	33,264	32,334
Other assets	399,459	402,256
TOTAL ASSETS	12,414,566	12,328,811
Deposits:
Noninterest-bearing	2,652,948	2,591,619
Interest-bearing	6,629,478	6,453,866
Total deposits	9,282,426	9,045,485
Borrowings:
Federal funds purchased	51,425	53,840
Securities sold under agreements to repurchase	384,006	434,155
Federal Home Loan Bank borrowings	704,940	830,335
Other long-term borrowings	223,071	222,636
Reserve for lending-related commitments	1,380	1,518
Accrued expenses and other liabilities	79,305	84,682
TOTAL LIABILITIES	$ 10,726,553	$ 10,672,651
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-69,514,897 and 69,314,407 at June 30, 2015 and December 31, 2014, respectively, including 21,024 and 18,548 shares in treasury at June 30, 2015 and December 31, 2014, respectively	$ 173,787	$ 173,286
Surplus	748,630	742,960
Retained earnings	801,307	776,311
Accumulated other comprehensive loss	(34,991)	(35,764)
Treasury stock, at cost	(720)	(633)
TOTAL SHAREHOLDERS' EQUITY	1,688,013	1,656,160
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 12,414,566	$ 12,328,811

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Securities available for sale, amortized cost	$ 1,127,640	$ 1,180,016
Securities held to maturity	$ 36,700	$ 36,784
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	69,514,897	69,314,407
Common stock, shares in treasury	21,024	18,548

Consolidated Statements of Inco

Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest income
Interest and fees on loans	$ 96,704	$ 96,175	$ 191,853	$ 183,789
Interest on federal funds sold and other short-term investments	350	248	681	415
Interest and dividends on securities:
Taxable	7,582	7,467	15,771	13,996
Tax-exempt	896	909	1,776	1,763
Total interest income	105,532	104,799	210,081	199,963
Interest expense
Interest on deposits	6,796	7,015	13,681	13,416
Interest on short-term borrowings	209	324	440	677
Interest on long-term borrowings	2,625	3,528	5,309	6,636
Total interest expense	9,630	10,867	19,430	20,729
Net interest income	95,902	93,932	190,651	179,234
Provision for loan losses	5,716	6,201	11,070	10,880
Net interest income after provision for loan losses	90,186	87,731	179,581	168,354
Other income
Fees from trust and brokerage services	4,931	4,641	9,823	9,234
Fees from deposit services	10,434	10,902	20,207	20,461
Bankcard fees and merchant discounts	1,231	1,127	2,045	1,873
Other service charges, commissions, and fees	639	602	1,117	1,029
Income from bank-owned life insurance	1,258	1,445	2,531	2,696
Income from mortgage banking	663	438	1,208	697
Net gain on the sale of bank premises	0	0	0	8,976
Other income	339	259	743	650
Total other-than-temporary impairment losses	0	0	(100)	1,046
Portion of loss recognized in other comprehensive income	0	(421)	66	(2,106)
Net other-than-temporary impairment losses	0	(421)	(34)	(1,060)
Net gains on sales/calls of investment securities	3	1	49	825
Net investment securities gains (losses)	3	(420)	15	(235)
Total other income	19,498	18,994	37,689	45,381
Other expense
Employee compensation	20,724	21,546	40,992	46,553
Employee benefits	6,588	5,190	13,391	10,814
Net occupancy expense	6,542	6,514	13,071	12,949
Other real estate owned (OREO) expense	1,121	1,037	2,234	3,150
Equipment expense	2,020	2,241	4,144	4,142
Data processing expense	3,867	3,589	7,610	6,826
Bankcard processing expense	353	348	702	672
FDIC insurance expense	2,061	2,071	4,155	3,578
Other expense	14,454	14,567	29,086	29,445
Total other expense	57,730	57,103	115,385	118,129
Income before income taxes	51,954	49,622	101,885	95,606
Income taxes	17,145	16,375	32,449	32,235
Net income	$ 34,809	$ 33,247	$ 69,436	$ 63,371
Earnings per common share:
Basic	$ 0.50	$ 0.48	$ 1	$ 0.96
Diluted	0.50	0.48	1	0.96
Dividends per common share	$ 0.32	$ 0.32	$ 0.64	$ 0.64
Average outstanding shares:
Basic	69,305,612	68,956,123	69,256,831	65,713,854
Diluted	69,587,417	69,154,032	69,531,839	65,949,455

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 34,809	$ 33,247	$ 69,436	$ 63,371
Change in net unrealized gain (loss) on available-for-sale (AFS) securities, net of tax	(6,100)	8,415	(766)	16,810
Accretion of the net unrealized loss on the transfer of AFS securities to held-to-maturity (HTM) securities, net of tax	2	1	3	2
Change in pension plan assets, net of tax	768	310	1,536	619
Comprehensive income, net of tax	$ 29,479	$ 41,973	$ 70,209	$ 80,802

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders' Equity (Unaudited) - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 31, 2014	$ 1,656,160	$ 173,286	$ 742,960	$ 776,311	$ (35,764)	$ (633)
Beginning Balance, shares at Dec. 31, 2014		69,314,407
Comprehensive income:
Net income	69,436	$ 0	0	69,436	0	0
Other comprehensive income, net of tax:	773	0	0	0	773	0
Comprehensive income, net of tax	70,209
Stock based compensation expense	1,388	0	1,388	0	0	0
Purchase of treasury stock (8 shares)	0	0	0	0	0	0
Cash dividends ($0.64 per share)	(44,440)	0	0	(44,440)	0	0
Grant of restricted stock (53,071 shares)	0	$ 132	(132)	0	0	0
Grant of restricted stock, shares		53,071
Forfeiture of restricted stock (2,468 shares)	0	$ 0	87	0	0	(87)
Common stock options exercised (147,419 shares)	$ 4,696	$ 369	(4,327)	0	0	0
Common stock options exercised, shares	147,419	147,419
Ending Balance at Jun. 30, 2015	$ 1,688,013	$ 173,787	$ 748,630	$ 801,307	$ (34,991)	$ (720)
Ending Balance, shares at Jun. 30, 2015		69,514,897

Consolidated Statement of Chan7

Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015
Cash dividends per share	$ 0.64
Common stock options exercised, shares	147,419
Common Stock [Member]
Grant of restricted stock, shares	53,071
Forfeiture of restricted stock, shares	2,468
Common stock options exercised, shares	147,419
Treasury Stock [Member]
Purchase of treasury stock, shares	8

Condensed Consolidated Statemen

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Statement of Cash Flows [Abstract]
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 72,371	$ 57,520
INVESTING ACTIVITIES
Proceeds from maturities and calls of securities held to maturity	184	176
Proceeds from sales of securities available for sale	3,436	81,194
Proceeds from maturities and calls of securities available for sale	84,031	354,689
Purchases of securities available for sale	(36,057)	(311,575)
Purchases of bank premises and equipment	(2,279)	(4,263)
Proceeds from sales of bank premises and equipment	994	11,426
Redemption of bank-owned life insurance policies	0	135
Purchases of other investment securities	(10,561)	(49,758)
Proceeds from sales and redemptions of other investment securities	14,449	33,329
Acquisition of Virginia Commerce Bancorp, Inc., net of cash paid	0	97,298
Net change in loans	15,687	(161,656)
NET CASH PROVIDED BY INVESTING ACTIVITIES	69,884	50,995
FINANCING ACTIVITIES
Cash dividends paid	(44,374)	(38,224)
Excess tax benefits from stock-based compensation arrangements	635	431
Acquisition of treasury stock	0	(1)
Proceeds from exercise of stock options	4,558	6,272
Repayment of long-term Federal Home Loan Bank borrowings	(790,395)	(420,732)
Proceeds from issuance of long-term Federal Home Loan Bank borrowings	665,000	700,000
Distribution of treasury stock for deferred compensation plan	0	79
Changes in:
Deposits	238,182	101,892
Federal funds purchased, securities sold under agreements to repurchase and other short-term borrowings	(51,824)	(159,473)
NET CASH PROVIDED BY FINANCING ACTIVITIES	21,782	190,244
Increase in cash and cash equivalents	164,037	298,759
Cash and cash equivalents at beginning of year	753,064	416,617
Cash and cash equivalents at end of period	$ 917,101	$ 715,376

General

General	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	1. GENERAL The accompanying unaudited consolidated interim financial statements of United Bankshares, Inc. and Subsidiaries (“United” or “the Company”) have been prepared in accordance with accounting principles for interim financial information generally accepted in the United States and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, the financial statements do not contain all of the information and footnotes required by accounting principles generally accepted in the United States. In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. The financial statements presented as of June 30, 2015 and 2014 and for the three-month and six-month periods then ended have not been audited. The consolidated balance sheet as of December 31, 2014 has been extracted from the audited financial statements included in United’s 2014 Annual Report to Shareholders. The accounting and reporting policies followed in the presentation of these financial statements are consistent with those applied in the preparation of the 2014 Annual Report of United on Form 10-K. To conform to the 2015 presentation, certain reclassifications have been made to prior period amounts, which had no impact on net income, comprehensive income or stockholders’ equity. In the opinion of management, all adjustments necessary for a fair presentation of financial position and results of operations for the interim periods have been made. Such adjustments are of a normal and recurring nature. The accompanying consolidated interim financial statements include the accounts of United and its wholly owned subsidiaries. United considers all of its principal business activities to be bank related. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements. Dollars are in thousands, except per share or unless otherwise noted. New Accounting Standards 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 provision 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 is effective for United on January 1, 2016. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016 and is not expected to have a significant impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016, and is not expected to have a significant impact on the Company’s financial condition or results of operation. 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 operation.

Mergers and Acquisitions

Mergers and Acquisitions	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Mergers and Acquisitions	2. MERGERS AND ACQUISITIONS At the close of business on January 31, 2014 (Acquisition Date), United acquired 100% of the outstanding common stock of Virginia Commerce Bancorp, Inc. (Virginia Commerce), a Virginia corporation headquartered in Arlington, Virginia. The acquisition of Virginia Commerce significantly enhances United’s existing footprint in the Washington, D.C. Metropolitan Statistical Area. The results of operations of Virginia Commerce are included in the consolidated results of operations from the date of acquisition. At consummation, Virginia Commerce had assets of $2,769,716, loans of $2,065,490 and deposits of $2,018,962. The transaction was accounted for under the purchase 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 $585,533 including common stock issued valued at $547,894, stock options exchanged valued at $4,368, cash paid of $33,263 to redeem the warrant held by the U.S. Department of the Treasury (the Treasury) issued by Virginia Commerce in connection with the TARP Capital Purchase Program and $8 paid in cash to holders of Virginia Commerce common stock and restricted stock in lieu of fractional shares of United common stock. The cash portion of the purchase price was funded by cash on hand. The purchase price of the warrant was based on its fair market as agreed upon by United and the Treasury. As a result of the purchase by United, the warrant has been canceled. The number of shares issued in the transaction was 18,330,347, which were valued based on the closing market price of $29.89 for United’s common shares on January 31, 2014. The purchase price has been allocated to the identifiable tangible and intangible assets resulting in additions to goodwill and core deposit intangibles of $336,102 and $17,143, respectively. The core deposit intangibles are being 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 Virginia Commerce acquisition is deductible for tax purposes. As a result of the merger, United recorded a downward fair value adjustment of $88,129 on the loans acquired from Virginia Commerce, a downward fair value adjustment of $1,708 on certain other real estate owned properties, a premium on interest-bearing deposits of $6,007, a premium on term securities sold under agreements to repurchase of $3,700 and a discount of $16,384 on junior subordinated debt securities. The discount and premium amounts are being amortized or accreted on an accelerated basis over each asset’s or liability’s estimated remaining life at the time of acquisition. At June 30, 2015, the premium on the interest-bearing deposits and the securities sold under agreements to repurchase has an estimated remaining life of six months and 1.08 years, respectively, while the discount on the junior subordinated debt securities has an estimated remaining life of 19.08 years. United assumed $109 of liabilities to provide severance benefits to terminated employees of Virginia Commerce which has no remaining balance as of June 30, 2015. 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 was based on the present value of the expected cash flows. Periodic principal and interest cash flows were 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 Virginia Commerce’s previously established allowance for loan losses. As a result, standard industry coverage ratios with regard to the allowance for credit losses are less meaningful after the acquisition of Virginia Commerce. The acquired loans were 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. In conjunction with the Virginia Commerce merger, the acquired loan portfolio was accounted for at fair value as follows: January 31, Contractually required principal and interest at acquisition $ 2,685,339 Contractual cash flows not expected to be collected (396,024 ) Expected cash flows at acquisition 2,289,315 Interest component of expected cash flows (274,539 ) Basis in acquired loans at acquisition – estimated fair value $ 2,014,776 Included in the above table is information related to acquired impaired loans. Specifically, contractually required principal and interest, cash flows expected to be collected and estimated fair value of acquired impaired loans were $427,858, $189,277, and $179,199, respectively. The following table shows the consideration paid for Virginia Commerce’s common equity and the amounts of acquired identifiable assets and liabilities assumed as of the Acquisition Date. Purchase price: Value of common shares issued (18,330,347 shares) $ 547,894 Fair value of stock options assumed 4,368 Cash to redeem the Treasury warrant 33,263 Cash for fractional shares 8 Total purchase price 585,533 Identifiable assets: Cash and cash equivalents 130,569 Investment securities 476,541 Loans 2,014,776 Premises and equipment 10,786 Core deposit intangibles 17,143 Other assets 104,131 Total identifiable assets $ 2,753,946 Identifiable liabilities: Deposits $ 2,024,969 Short-term borrowings 263,816 Long-term borrowings 204,335 Other liabilities 11,395 Total identifiable liabilities 2,504,515 Net assets acquired including identifiable intangible assets 249,431 Resulting goodwill $ 336,102 The following table provides a reconciliation of goodwill: Goodwill at December 31, 2014 $ 709,794 Addition to goodwill from Virginia Commerce acquisition 458 Goodwill at June 30, 2015 $ 710,252

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2015
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, 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 $ 78,742 $ 1,850 $ 1 $ 80,591 $ 0 State and political subdivisions 135,206 2,194 464 136,936 0 Residential mortgage-backed securities Agency 512,276 8,621 467 520,430 0 Non-agency 10,249 557 0 10,806 458 Commercial mortgage-backed securities Agency 309,385 2,673 1,441 310,617 0 Asset-backed securities 8,003 0 3 8,000 0 Trust preferred collateralized debt obligations 50,014 673 14,046 36,641 25,952 Single issue trust preferred securities 13,785 217 1,928 12,074 0 Other corporate securities 4,998 88 0 5,086 0 Marketable equity securities 4,982 653 7 5,628 0 Total $ 1,127,640 $ 17,526 $ 18,357 $ 1,126,809 $ 26,410 December 31, 2014 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 $ 88,559 $ 1,425 $ 3 $ 89,981 $ 0 State and political subdivisions 133,730 3,165 32 136,863 0 Residential mortgage-backed securities Agency 547,825 8,407 547 555,685 0 Non-agency 11,474 544 0 12,018 458 Commercial mortgage-backed securities Agency 316,707 2,393 2,001 317,099 0 Asset-backed securities 8,004 23 0 8,027 0 Trust preferred collateralized debt obligations 51,328 922 12,692 39,558 25,886 Single issue trust preferred securities 13,760 173 2,189 11,744 0 Other corporate securities 4,998 137 0 5,135 0 Marketable equity securities 3,631 648 3 4,276 0 Total $ 1,180,016 $ 17,837 $ 17,467 $ 1,180,386 $ 26,344 (1) 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, 2015 and December 31, 2014. Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses June 30, 2015 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 69 $ 1 State and political subdivisions 26,805 464 0 0 Residential mortgage-backed securities Agency 66,915 467 0 0 Commercial mortgage-backed securities Agency 100,274 881 44,707 560 Asset-backed securities 8,000 3 0 0 Trust preferred collateralized debt obligations 0 0 30,352 14,046 Single issue trust preferred securities 0 0 8,361 1,928 Marketable equity securities 20 7 0 0 Total $ 202,014 $ 1,822 $ 83,489 $ 16,535 December 31, 2014 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 7,142 $ 3 $ 0 $ 0 State and political subdivisions 11,637 32 0 0 Residential mortgage-backed securities Agency 96,550 547 0 0 Commercial mortgage-backed securities Agency 21,674 56 146,897 1,945 Asset-backed securities 0 0 0 0 Trust preferred collateralized debt obligations 0 0 32,241 12,692 Single issue trust preferred securities 0 0 8,080 2,189 Marketable equity securities 23 3 0 0 Total $ 137,026 $ 641 $ 187,218 $ 16,826 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 2015 2014 2015 2014 Proceeds from sales and calls $ 51,381 $ 175,451 $ 87,468 $ 435,883 Gross realized gains 4 3 54 1,052 Gross realized losses 1 2 5 227 At June 30, 2015, gross unrealized losses on available for sale securities were $18,357 on 90 securities of a total portfolio of 446 available for sale securities. Securities in an unrealized loss position at June 30, 2015 consisted primarily of pooled trust preferred collateralized debt obligations (Trup Cdos), single issue trust preferred securities and agency commercial mortgage-backed securities. The Trup Cdos and the single issue trust preferred securities relate mainly to securities of financial institutions. The agency commercial mortgage-backed securities relate to income-producing multifamily properties and provide a guaranty of full and timely payments of principal and interest by the issuing agency. 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 $821,661 at June 30, 2015. Of the $821,661, $309,385 was related to agency commercial mortgage securities and $512,276 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, 2015. 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 securities was $10,249 at June 30, 2015. Of the $10,249, $2,338 was rated above investment grade and $7,911 was rated below investment grade. Approximately 31% of the portfolio includes collateral that was originated during the year of 2005 or before. The remaining 69% includes collateral that was originated in the years of 2006 and 2007. The entire portfolio of the non-agency residential mortgage securities are 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, there was no additional credit-related or noncredit-related other-than-temporary impairment recognized on the non-agency residential mortgage-backed securities at June 30, 2015. 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, TARP participation status, and other key factors. Upon completing the review for the second quarter of 2015, 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 B+ to a high of BBB-. The amortized cost of available for sale single issue trust preferred securities as of June 30, 2015 consisted of $8,109 in split-rated bonds and $5,676 in below investment grade bonds. The amortized cost of available for sale single issue trust preferred securities included $10,290 that was in an unrealized loss position for twelve months or longer as of June 30, 2015. 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, 2015, 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 TARP participation, 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 flow during the second quarter of 2015, as the expected discounted cash flows from these securities were greater than or equal to the discounted cash flow 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 2015 related to these securities. At June 30, 2015, the balance of the noncredit-related other-than-temporary impairment recognized on United’s Trup Cdo portfolio was $25,952 as compared to $25,886 at December 31, 2014. The amortized cost of available for sale Trup Cdos in an unrealized loss position for twelve months or longer as of June 30, 2015 consisted of $4,667 in investment grade bonds and $39,731 in below investment grade bonds. The following is a summary of the available for sale Trup Cdos as of June 30, 2015: Amortized Cost Class Amortized Cost Fair Value Unrealized Loss Investment Split Below Senior – Bank $ 6,879 $ 5,968 $ 911 $ 4,667 $ 0 $ 2,212 Mezzanine – Bank (now in senior position) 11,864 9,212 2,652 0 0 11,864 Mezzanine – Bank 26,090 17,585 8,505 0 0 26,090 Mezzanine – Bank & Insurance (combination) 5,181 3,876 1,305 0 0 5,181 Totals $ 50,014 $ 36,641 $ 13,373 $ 4,667 $ 0 $ 45,347 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. Overall, the Company believes the lack of new issuances, illiquid secondary market, limited pool of buyers, below investment grade ratings, complex structures and high market discount rates are the key drivers of the remaining unrealized losses in the Company’s Trup Cdos and the robust expected cash flow analysis substantiates the return of the remaining amortized cost under ASC 320. 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 BBB- to a high of Aaa. The below investment grade Trup Cdos range from a low of Ca 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 97.7% to a high of 305.5%, with a median of 144.5%, and a weighted average of 205.0%. 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. Management does not believe any individual security with an unrealized loss as of June 30, 2015 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 $4,982 at June 30, 2015. 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, 2015. These securities were in an unrealized net gain position of $646 at June 30, 2015. Other investment securities (cost method) During the second quarter of 2015, United also evaluated all of its cost method investments to determine if certain events or changes in circumstances during the second quarter of 2015 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 second 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 2015 2014 2015 2014 Balance of cumulative credit losses at beginning of period $ 23,773 $ 33,661 $ 23,739 $ 40,663 Addition for credit losses recognized in earnings during the period: Additional credit losses on securities for which OTTI was previously recognized 0 421 34 1,024 Reductions for securities sold or paid off during the period 0 0 0 (7,605 ) Balance of cumulative credit losses at end of period $ 23,773 $ 34,082 $ 23,773 $ 34,082 The amortized cost and estimated fair value of securities available for sale at June 30, 2015 and December 31, 2014 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, 2015 December 31, 2014 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 19,750 $ 19,867 $ 38,358 $ 38,727 Due after one year through five years 266,710 267,853 180,821 181,930 Due after five years through ten years 222,314 226,797 313,863 317,663 Due after ten years 613,884 606,664 643,343 637,790 Marketable equity securities 4,982 5,628 3,631 4,276 Total $ 1,127,640 $ 1,126,809 $ 1,180,016 $ 1,180,386 The amortized cost and estimated fair values of securities held to maturity are summarized as follows: June 30, 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 $ 10,514 $ 1,137 $ 0 $ 11,651 State and political subdivisions 9,190 24 310 8,904 Residential mortgage-backed securities Agency 37 7 0 44 Single issue trust preferred securities 19,289 0 3,208 16,081 Other corporate securities 20 0 0 20 Total $ 39,050 $ 1,168 $ 3,518 $ 36,700 December 31, 2014 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 10,599 $ 1,329 $ 0 $ 11,928 State and political subdivisions 9,369 32 294 9,107 Residential mortgage-backed securities Agency 41 7 0 48 Single issue trust preferred securities 19,281 0 3,600 15,681 Other corporate securities 20 0 0 20 Total $ 39,310 $ 1,368 $ 3,894 $ 36,784 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, 2015, the Company’s two largest held-to-maturity single-issue trust preferred exposures were to Wells Fargo ($9,911) and SunTrust Bank ($7,405). The two held-to-maturity single-issue trust preferred exposures with at least one rating below investment grade included SunTrust Bank ($7,405) and Royal Bank of Scotland ($973). Other corporate securities consist mainly of bonds of corporations. The amortized cost and estimated fair value of debt securities held to maturity at June 30, 2015 and December 31, 2014 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, 2015 December 31, 2014 Amortized Estimated Amortized Estimated Due in one year or less $ 5,248 $ 5,480 $ 360 $ 361 Due after one year through five years 9,347 10,266 14,499 15,848 Due after five years through ten years 4,293 3,991 4,293 4,007 Due after ten years 20,162 16,963 20,158 16,568 Total $ 39,050 $ 36,700 $ 39,310 $ 36,784 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 $1,059,960 and $1,081,299 at June 30, 2015 and December 31, 2014, respectively.

Loans

Loans	6 Months Ended
	Jun. 30, 2015
Receivables [Abstract]
Loans	4. LOANS Major classes of loans are as follows: June 30, 2015 December 31, Commercial, financial and agricultural: Owner-occupied commercial real estate $ 962,615 $ 1,016,364 Nonowner-occupied commercial real estate 2,719,910 2,760,189 Other commercial loans 1,607,719 1,577,438 Total commercial, financial & agricultural 5,290,244 5,353,991 Residential real estate 2,248,037 2,263,354 Construction & land development 1,162,742 1,133,251 Consumer: Bankcard 10,428 10,437 Other consumer 385,850 358,459 Total gross loans $ 9,097,301 $ 9,119,492 The table above does not include loans held for sale of $14,856 and $8,680 at June 30, 2015 and December 31, 2014, 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 acquired impaired loans with a recorded investment of $162,073 or 1.78% of total gross loans at June 30, 2015 and $176,339 or 1.93% of total gross loans at December 31, 2014. The contractual principal in these acquired impaired loans was $227,560 and $252,759 at June 30, 2015 and December 31, 2014, respectively. The balances above do not include future accretable net interest (i.e. the difference between the undiscounted expected cash flows and the recorded investment in the loan) on the acquired impaired loans. Activity for the accretable yield for the first six months of 2015 follows: Accretable yield at the beginning of the period $ 11,339 Accretion (including cash recoveries) (5,872 ) Net reclassifications to accretable from non-accretable 7,549 Disposals (including maturities, foreclosures, and charge-offs) (580 ) Accretable yield at the end of the period $ 12,436 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 $186,027 and $188,516 at June 30, 2015 and December 31, 2014, respectively.

Credit Quality

Credit Quality	6 Months Ended
	Jun. 30, 2015
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, 2015, United had TDRs of $21,992 as compared to $22,234 as of December 31, 2014. Of the $21,992 aggregate balance of TDRs at June 30, 2015, $9,837 was on nonaccrual status and included in the “Loans on Nonaccrual Status” on the following page. Of the $22,234 aggregate balance of TDRs at December 31, 2014, $4,194 was on nonaccrual status and included in the “Loans on Nonaccrual Status” on the following page. As of June 30, 2015, there were no commitments to lend additional funds to debtors owing receivables whose terms have been modified in TDRs. At June 30, 2015, United had restructured loans in the amount of $3,913 that were modified by a reduction in the interest rate, $8,017 that were modified by a combination of a reduction in the interest rate and the principal and $10,062 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, 2015 and 2014, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2015 June 30, 2014 Number of Pre- Modification Post- Number of Pre- Modification Post- Commercial real estate: Owner-occupied 0 $ 0 $ 0 0 $ 0 $ 0 Nonowner-occupied 1 669 669 0 0 0 Other commercial 0 0 0 2 5,630 5,630 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 1 $ 669 $ 669 2 $ 5,630 $ 5,630 The following table sets forth United’s troubled debt restructurings that have been restructured during the six months ended June 30, 2015 and 2014, segregated by class of loans: Troubled Debt Restructurings For the Six Months Ended June 30, 2015 June 30, 2014 Number of Pre- Modification Post- Number of Pre- Modification Post- Commercial real estate: Owner-occupied 0 $ 0 $ 0 0 $ 0 $ 0 Nonowner-occupied 1 669 669 0 0 0 Other commercial 1 240 240 2 5,630 5,630 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 $ 909 $ 909 2 $ 5,630 $ 5,630 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. During the second quarter and first six months of 2014, $5,630 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, 2015 and 2014 subsequently defaulted, resulting in a principal charge-off during the first six months of 2015 and 2014, 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, 2015 30-89 90 Days or more Past Due Total Past Current & Total Financing Recorded Commercial real estate: Owner-occupied $ 6,907 $ 13,228 $ 20,135 $ 942,480 $ 962,615 $ 585 Nonowner-occupied 33,582 22,233 55,815 2,664,095 2,719,910 3,414 Other commercial 22,238 25,266 47,504 1,560,215 1,607,719 3,453 Residential real estate 35,357 30,279 65,636 2,182,401 2,248,037 2,648 Construction & land development 6,449 15,858 22,307 1,140,435 1,162,742 425 Consumer: Bankcard 214 166 380 10,048 10,428 166 Other consumer 6,878 1,285 8,163 377,687 385,850 944 Total $ 111,625 $ 108,315 $ 219,940 $ 8,877,361 $ 9,097,301 $ 11,635 (1) Other includes loans with a recorded investment of $162,073 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, 2014 30-89 90 Days Total Past Current & Total Financing Recorded Commercial real estate: Owner-occupied $ 4,158 $ 13,582 $ 17,740 $ 998,624 $ 1,016,364 $ 1,039 Nonowner-occupied 10,627 14,859 25,486 2,734,703 2,760,189 45 Other commercial 17,348 17,975 35,323 1,542,115 1,577,438 3,034 Residential real estate 40,793 25,544 66,337 2,197,017 2,263,354 5,417 Construction & land development 5,329 17,119 22,448 1,110,803 1,133,251 648 Consumer: Bankcard 471 114 585 9,852 10,437 114 Other consumer 8,992 1,727 10,719 347,740 358,459 1,378 Total $ 87,718 $ 90,920 $ 178,638 $ 8,940,854 $ 9,119,492 $ 11,675 (1) Other includes loans with a recorded investment of $176,339 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, 2015 December 31, 2014 Commercial real estate: Owner-occupied $ 12,643 $ 12,543 Nonowner-occupied 18,819 14,814 Other commercial 21,813 14,941 Residential real estate 27,631 20,127 Construction & land development 15,433 16,471 Consumer: Bankcard 0 0 Other consumer 341 349 Total $ 96,680 $ 79,245 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, 2015 Commercial Real Estate Other Construction Owner- Nonowner- Grade: Pass $ 871,955 $ 2,547,470 $ 1,453,495 $ 993,568 Special mention 19,006 37,040 25,093 61,078 Substandard 71,654 135,400 123,302 108,096 Doubtful 0 0 5,829 0 Total $ 962,615 $ 2,719,910 $ 1,607,719 $ 1,162,742 As of December 31, 2014 Commercial Real Estate Other Construction Owner- Nonowner- Grade: Pass $ 920,981 $ 2,592,783 $ 1,407,853 $ 966,335 Special mention 26,181 48,382 20,776 64,597 Substandard 69,202 119,024 147,494 102,319 Doubtful 0 0 1,315 0 Total $ 1,016,364 $ 2,760,189 $ 1,577,438 $ 1,133,251 Credit Quality Indicators Consumer Credit Exposure As of June 30, 2015 Residential Bankcard Other Grade: Pass $ 2,165,134 $ 10,047 $ 377,467 Special mention 16,609 215 6,988 Substandard 64,800 166 1,395 Doubtful 1,494 0 0 Total $ 2,248,037 $ 10,428 $ 385,850 As of December 31, 2014 Residential Bankcard Other Grade: Pass $ 2,176,655 $ 9,852 $ 347,442 Special mention 18,254 471 9,113 Substandard 66,973 114 1,904 Doubtful 1,472 0 0 Total $ 2,263,354 $ 10,437 $ 358,459 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, 2015 December 31, 2014 Recorded Unpaid Related Recorded Unpaid Related With no related allowance recorded: Commercial real estate: Owner-occupied $ 43,920 $ 44,133 $ 0 $ 37,811 $ 37,811 $ 0 Nonowner-occupied 71,073 71,538 0 48,126 48,462 0 Other commercial 35,676 37,389 0 38,521 40,329 0 Residential real estate 31,368 32,133 0 31,262 31,930 0 Construction & land development 33,500 37,481 0 64,945 68,799 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 30 30 0 41 41 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,616 $ 4,616 $ 1,099 $ 5,014 $ 5,014 $ 776 Nonowner-occupied 6,727 6,727 1,347 6,994 6,994 797 Other commercial 19,692 23,193 11,887 17,554 20,554 7,168 Residential real estate 7,548 8,869 3,577 6,028 7,349 2,578 Construction & land development 11,686 15,415 3,859 10,779 14,189 3,627 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 48,536 $ 48,749 $ 1,099 $ 42,825 $ 42,825 $ 776 Nonowner-occupied 77,800 78,265 1,347 55,120 55,456 797 Other commercial 55,368 60,582 11,887 56,075 60,883 7,168 Residential real estate 38,916 41,002 3,577 37,290 39,279 2,578 Construction & land development 45,186 52,896 3,859 75,724 82,988 3,627 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 30 30 0 41 41 0 Impaired Loans For the Three Months Ended June 30, 2015 June 30, 2014 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 43,898 $ 117 $ 37,654 $ 425 Nonowner-occupied 66,936 354 63,135 154 Other commercial 35,659 140 31,403 147 Residential real estate 30,867 97 30,535 96 Construction & land development 36,722 80 47,169 68 Consumer: Bankcard 0 0 0 0 Other consumer 35 0 42 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,789 $ 20 $ 3,695 $ 34 Nonowner-occupied 6,847 7 7,794 46 Other commercial 19,764 154 12,234 82 Residential real estate 7,119 18 7,880 29 Construction & land development 10,740 58 10,328 12 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 152 0 Total: Commercial real estate: Owner-occupied $ 48,687 $ 137 $ 41,349 $ 459 Nonowner-occupied 73,783 361 70,929 200 Other commercial 55,423 294 43,637 229 Residential real estate 37,986 115 38,415 125 Construction & land development 47,462 138 57,497 80 Consumer: Bankcard 0 0 0 0 Other consumer 35 0 194 0 Impaired Loans For the Six Months Ended June 30, 2015 June 30, 2014 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 40,294 $ 179 $ 26,752 $ 488 Nonowner-occupied 61,290 517 44,110 210 Other commercial 32,580 240 24,368 158 Residential real estate 31,912 146 24,369 149 Construction & land development 45,541 159 36,118 137 Consumer: Bankcard 0 0 0 0 Other consumer 40 0 28 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,936 $ 58 $ 3,916 $ 75 Nonowner-occupied 7,112 46 8,313 92 Other commercial 19,083 218 12,680 88 Residential real estate 6,692 29 7,810 93 Construction & land development 10,833 92 10,569 16 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 152 0 Total: Commercial real estate: Owner-occupied $ 45,230 $ 237 $ 30,668 $ 563 Nonowner-occupied 68,402 563 52,423 302 Other commercial 51,663 458 37,048 246 Residential real estate 38,604 175 32,179 242 Construction & land development 56,374 251 46,687 153 Consumer: Bankcard 0 0 0 0 Other consumer 40 0 180 0 At June 30, 2015 and December 31, 2014, other real estate owned (OREO) included in other assets in the Consolidated Balance Sheets was $34,964 and $38,778, 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, 2015 and December 31, 2014, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $655 and $311, respectively.

Allowance for Credit Losses

Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2015
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. Allocations are made for specific commercial loans based upon management’s estimate of the borrowers’ ability to repay and other factors impacting collectibility. Other commercial loans not specifically reviewed on an individual basis are evaluated based on historical loss percentages applied to loan pools that have been segregated by the type of risk. Allocations for loans other than commercial loans are made based upon historical loss experience adjusted for current environmental conditions. The allowance for credit losses includes estimated probable inherent but undetected losses within the portfolio due to uncertainties in economic conditions, delays in obtaining information, including unfavorable information about a borrower’s financial condition, the difficulty in identifying triggering events that correlate perfectly to subsequent loss rates, and risk factors that have not yet fully manifested themselves in loss allocation factors. In addition, a portion of the allowance accounts for the inherent imprecision in the allowance for credit losses analysis. 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 2015, 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 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). The amount of provision for loan losses related to loans acquired that have evidence of deterioration of credit quality was $668 and $274 for the second quarter of 2015 and 2014, respectively, and $4,032 and $346 for the six months ended June 30, 2015 and 2014, respectively. 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 $1,380 and $1,518 at June 30, 2015 and December 31, 2014, 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, 2015 Commercial Real Estate Other Residential Construction Consumer Allowance for Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 4,406 $ 7,670 $ 28,587 $ 14,557 $ 16,945 $ 3,251 $ 157 $ 75,573 Charge-offs 507 157 3,801 1,509 2 651 0 6,627 Recoveries 18 20 85 208 62 160 0 553 Provision 330 (237 ) 3,605 1,664 (30 ) 409 (25 ) 5,716 Ending balance $ 4,247 $ 7,296 $ 28,476 $ 14,920 $ 16,975 $ 3,169 $ 132 $ 75,215 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2015 Commercial Real Estate Other Residential Construction Consumer Allowance for Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 4,041 $ 8,167 $ 26,931 $ 13,835 $ 19,402 $ 3,083 $ 70 $ 75,529 Charge-offs 4,128 327 4,052 2,132 771 1,325 0 12,735 Recoveries 120 38 196 271 387 339 0 1,351 Provision 4.214 (582 ) 5,401 2,946 (2,043 ) 1,072 62 11,070 Ending balance $ 4,247 $ 7,296 $ 28,476 $ 14,920 $ 16,975 $ 3,169 $ 132 $ 75,215 Ending Balance: individually evaluated for impairment $ 1,098 $ 1,347 $ 11,887 $ 3,578 $ 3,859 $ 0 $ 0 $ 21,769 Ending Balance: collectively evaluated for impairment $ 3,149 $ 5,949 $ 16,589 $ 11,342 $ 13,116 $ 3,169 $ 132 $ 53,446 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2015 Commercial Real Estate Allowance for Owner- Nonowner- Other Residential Estate Construction Consumer Total Financing receivables: Ending balance $ 962,615 $ 2,719,910 $ 1,607,719 $ 2,248,037 $ 1,162,742 $ 396,278 $ 0 $ 9,097,301 Ending Balance: individually evaluated for impairment $ 13,890 $ 22,281 $ 28,798 $ 16,994 $ 17,455 $ 0 $ 0 $ 99,418 Ending Balance: collectively evaluated for impairment $ 920,376 $ 2,643,554 $ 1,554,816 $ 2,213,383 $ 1,107,442 $ 396,239 $ 0 $ 8,835,810 Ending Balance: loans acquired with deteriorated credit quality $ 28,349 $ 54,075 $ 24,105 $ 17,660 $ 37,845 $ 39 $ 0 $ 162,073 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2014 Commercial Real Estate Other Residential Construction Consumer Allowance Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 5,653 $ 8,992 $ 20,917 $ 16,694 $ 18,953 $ 2,945 $ 44 $ 74,198 Charge-offs 3,073 2,097 4,947 5,027 7,476 2,621 0 25,241 Recoveries 2,372 268 294 573 685 443 0 4,635 Provision (911 ) 1,004 10,667 1,595 7,240 2,316 26 21,937 Ending balance $ 4,041 $ 8,167 $ 26,931 $ 13,835 $ 19,402 $ 3,083 $ 70 $ 75,529 Ending Balance: individually evaluated for impairment $ 776 $ 797 $ 7,168 $ 2,578 $ 3,627 $ 0 $ 0 $ 14,946 Ending Balance: collectively evaluated for impairment $ 3,265 $ 7,370 $ 19,763 $ 11,257 $ 15,775 $ 3,083 $ 70 $ 60,583 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2014 Commercial Real Estate Other Residential Estate Construction Consumer Allowance Total Owner- Nonowner- Financing receivables: Ending balance $ 1,016,364 $ 2,760,189 $ 1,577,438 $ 2,263,354 $ 1,133,251 $ 368,896 $ 0 $ 9,119,492 Ending Balance: individually evaluated for impairment $ 12,869 $ 13,733 $ 27,491 $ 16,189 $ 17,168 $ 0 $ 0 $ 87,450 Ending Balance: collectively evaluated for impairment $ 971,408 $ 2,692,374 $ 1,523,504 $ 2,227,605 $ 1,071,966 $ 368,846 $ 0 $ 8,855,703 Ending Balance: loans acquired with deteriorated credit quality $ 32,087 $ 54,082 $ 26,443 $ 19,560 $ 44,117 $ 50 $ 0 $ 176,339

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2015
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, 2015 Gross Carrying Accumulated Net Carrying Amortized intangible assets: Core deposit intangible assets $ 60,577 ($ 41,027 ) $ 19,550 Goodwill not subject to amortization $ 710,252 As of December 31, 2014 Gross Carrying Accumulated Net Carrying Amortized intangible assets: Core deposit intangible assets $ 60,577 ($ 39,317 ) $ 21,260 Goodwill not subject to amortization $ 709,794 United incurred amortization expense of $855 and $1,710 for the quarter and six months ended June 30, 2015, respectively, and $1,104 and $1,913 for the quarter and six months ended June 30, 2014, respectively. The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2014: Year Amount 2015 $ 3,420 2016 2,981 2017 2,767 2018 2,574 2019 and thereafter 9,518

Short-Term Borrowings

Short-Term Borrowings	6 Months Ended
	Jun. 30, 2015
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 $234,000. These lines of credit, which bear interest at prevailing market rates, permit United to borrow funds in the overnight market, and are renewable annually subject to certain conditions. At June 30, 2015, federal funds purchased were $51,425 while securities sold under agreements to repurchase (REPOs) were $332,403. Excluded from the $332,403 of total REPOs were wholesale REPOs of $51,603, 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, 2015, United had no outstanding balance under this line of credit.

Long-Term Borrowings

Long-Term Borrowings	6 Months Ended
	Jun. 30, 2015
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, 2015, United had an unused borrowing amount of approximately $2,430,378 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, 2015, $704,940 of FHLB advances with a weighted-average interest rate of 0.36% are scheduled to mature within the next four years. No overnight funds are included in the $704,940 above at June 30, 2015. The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2015 $ 669,012 2016 627 2017 301 2018 0 2019 and thereafter 35,000 Total $ 704,940 At June 30, 2015, 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, 2015 and December 31, 2014, the outstanding balance of the Debentures was $223,071 and $222,636, 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. During the fourth quarter of 2014, United redeemed the Capital Securities of Sequoia Capital Trust I. As part of the redemption, United retired the $2,000 principal of 10.18% Junior Subordinated Debentures issued by Sequoia Capital Trust I. Also, during the fourth quarter of 2014, United redeemed the Capital Securities of VCBI Capital Trust IV. As part of the redemption, United retired the $25,000 principal amount of 10.20% Junior Subordinated Debentures issued by VCBI Capital Trust IV. The redemptions were funded with excess cash available to United. 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, 2015, 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, 2015
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 $2,630,725 and $2,763,129 of loan commitments outstanding as of June 30, 2015 and December 31, 2014, 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, 2015 and December 31, 2014, United had $226 and $216, 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 of $152,762 and $160,230 as of June 30, 2015 and December 31, 2014, 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, 2015
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, 2015, 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, 2015. Derivative Classifications and Hedging Relationships June 30, 2015 Notional Amount Average Pay Rate Fair Value Hedges: Pay Fixed Swaps (Hedging Commercial Loans) $ 36,802 3.44 % Total Derivatives Used in Fair Value Hedges $ 36,802 Total Derivatives Used for Interest Rate Risk Management and Designated as Hedges $ 36,802 The following tables summarize the fair value of United’s derivative financial instruments. Asset Derivatives June 30, 2015 December 31, 2014 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other assets $ 72 Other assets $ 90 Total derivatives designated as hedging instruments $ 72 $ 90 Derivatives not designated as hedging instruments Interest rate contracts Other assets $ 3,099 Other assets $ 3,704 Total derivatives not designated as hedging instruments $ 3,099 $ 3,704 Total asset derivatives $ 3,171 $ 3,794 Liability Derivatives June 30, 2015 December 31, 2014 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other liabilities $ 191 Other liabilities $ 432 Total derivatives designated as hedging instruments $ 191 $ 432 Derivatives not designated as hedging instruments Interest rate contracts Other liabilities $ 3,099 Other liabilities $ 3,704 Total derivatives not designated as hedging instruments $ 3,099 $ 3,704 Total liability derivatives $ 3,290 $ 4,136 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, 2015 and 2014 are presented as follows: Three Months Ended Income Statement Location June 30, June 30, Derivatives in fair value hedging relationships Interest rate contracts Interest income/ (expense) $ 96 $ (273 ) Total derivatives in fair value hedging relationships $ 96 $ (273 ) 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 $ 96 $ (273 ) Six Months Ended Income Statement Location June 30, June 30, Derivatives in fair value hedging relationships Interest rate contracts Interest income/ (expense) $ (328 ) $ (524 ) Total derivatives in fair value hedging relationships $ (328 ) $ (524 ) 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 $ (328 ) $ (524 ) (1) Represents net gains from derivative assets not designated as hedging instruments.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2015
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 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, 2015 and December 31, 2014, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2015 Using Description Balance as of June 30, 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 $ 80,591 $ 0 $ 80,591 $ 0 State and political subdivisions 136,936 0 136,936 0 Residential mortgage-backed securities Agency 520,430 0 520,430 0 Non-agency 10,806 0 10,806 0 Asset-backed securities 8,000 0 8,000 0 Commercial mortgage-backed securities Agency 310,617 0 310,617 0 Trust preferred collateralized debt obligations 36,641 0 0 36,641 Single issue trust preferred securities 12,074 0 12,074 0 Other corporate securities 5,086 0 5,086 0 Total available for sale debt securities 1,121,181 0 1,084,540 36,641 Available for sale equity securities: Financial services industry 3,671 810 2,861 0 Equity mutual funds (1) 759 759 0 0 Other equity securities 1,198 1,198 0 0 Total available for sale equity securities 5,628 2,767 2,861 0 Total available for sale securities 1,126,809 2,767 1,087,401 36,641 Derivative financial assets: Interest rate contracts 3,171 0 3,171 0 Liabilities Derivative financial liabilities: Interest rate contracts 3,290 0 3,290 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, 2014 Using Description Balance as of December 31, 2014 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 $ 89,981 $ 0 $ 89,981 $ 0 State and political subdivisions 136,863 0 136,863 0 Residential mortgage-backed securities Agency 555,685 0 555,685 0 Non-agency 12,018 0 12,018 0 Asset-backed securities 8,027 0 8,027 0 Commercial mortgage-backed securities Agency 317,099 0 317,099 0 Trust preferred collateralized debt obligations 39,558 0 0 39,558 Single issue trust preferred securities 11,744 0 11,744 0 Other corporate securities 5,135 0 5,135 0 Total available for sale debt securities 1,176,110 0 1,136,552 39,558 Available for sale equity securities: Financial services industry 2,533 759 1,774 0 Equity mutual funds (1) 560 560 0 0 Other equity securities 1,183 1,183 0 0 Total available for sale equity securities 4,276 2,502 1,774 0 Total available for sale securities 1,180,386 2,502 1,138,326 39,558 Derivative financial assets: Interest rate contracts 3,794 0 3,794 0 Liabilities Derivative financial liabilities: Interest rate contracts 4,136 0 4,136 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. The following table presents additional information about financial assets and liabilities measured at fair value at June 30, 2015 and December 31, 2014 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, 2015 December 31, Balance, beginning of period $ 39,558 $ 43,449 Total gains or losses (realized/unrealized): Included in earnings (or changes in net assets) (34 ) (4,034 ) Included in other comprehensive income (2,883 ) 12,312 Purchases, issuances, and settlements 0 (12,169 ) Transfers in and/or out of Level 3 0 0 Balance, end of period $ 36,641 $ 39,558 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, 2015 Carrying value at June 30, 2015 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 $ 50,269 $ 0 $ 5,404 $ 44,865 $ 5,108 OREO 34,964 0 34,964 0 506 Description Balance as of December 31, 2014 Carrying value at December 31, 2014 YTD Losses Quoted Prices Significant Significant Assets Impaired Loans $ 46,369 $ 0 $ 8,518 $ 37,851 $ 7,349 OREO 38,778 0 38,778 0 3,307 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, 2015 Cash and cash equivalents $ 917,101 $ 917,101 $ 0 $ 917,101 $ 0 Securities available for sale 1,126,809 1,126,809 2,767 1,087,401 36,641 Securities held to maturity 39,050 36,700 0 34,680 2,020 Other securities 92,456 87,833 0 0 87,833 Loans held for sale 14,856 14,856 0 14,856 0 Loans 9,006,889 8,968,852 0 0 8,968,852 Derivative financial assets 3,171 3,171 0 3,171 0 Deposits 9,282,426 9,272,849 0 9,272,849 0 Short-term borrowings 383,828 383,828 0 383,828 0 Long-term borrowings 979,614 954,083 0 954,083 0 Derivative financial liabilities 3,290 3,290 0 3,290 0 December 31, 2014 Cash and cash equivalents $ 753,064 $ 753,064 $ 0 $ 753,064 $ 0 Securities available for sale 1,180,386 1,180,386 2,502 1,138,326 39,558 Securities held to maturity 39,310 36,784 0 34,764 2,020 Other securities 96,344 91,527 0 0 91,527 Loans held for sale 8,680 8,680 0 8,680 0 Loans 9,029,123 9,055,281 0 0 9,055,281 Derivative financial assets 3,794 3,794 0 3,794 0 Deposits 9,045,485 9,044,976 0 9,044,976 0 Short-term borrowings 435,652 435,652 0 435,652 0 Long-term borrowings 1,105,314 1,081,133 0 1,081,133 0 Derivative financial liabilities 4,136 4,136 0 4,136 0

Stock Based Compensation

Stock Based Compensation	6 Months Ended
	Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	13. STOCK BASED COMPENSATION On May 16, 2011, United’s shareholders approved the 2011 Long-Term Incentive Plan (2011 LTI Plan). The 2011 LTI Plan became effective as of July 1, 2011. An award granted under the 2011 LTI Plan may consist of any non-qualified stock options or incentive stock options, stock appreciation rights, restricted stock, or restricted stock units. 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 2011 LTI Plan is 1,500,000. 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 units awards which are settled in shares is 350,000, and (2) the aggregate number of shares that may be issued pursuant to stock options is 1,150,000. The shares to be offered under the 2011 LTI Plan may be authorized and unissued shares or treasury shares. With respect to awards that are intended to satisfy the requirements for performance-based compensation under Code Section 162(m), the maximum number of options and stock appreciation rights, in the aggregate, which may be awarded pursuant to the 2011 LTI Plan to any individual participant during any calendar year is 100,000, and the maximum number of shares of restricted stock and/or shares subject to a restricted stock units award that may be granted pursuant to the 2011 LTI Plan to any individual participant during any calendar year is 50,000 shares. A participant may be any key employee of United or its affiliates or a non-employee member of United’s Board of Directors. Subject to certain change in control provisions, stock options, SARs, restricted stock and restricted stock units generally will vest in 25% increments over the first four anniversaries of the awards unless the Committee specifies otherwise in the award agreement. No award will vest sooner than 1/3 per year over the first three anniversaries of the award. Beginning in 2014, awards granted to executive officers of United have performance based vesting conditions. A Form S-8 was filed on September 2, 2011 with the Securities and Exchange Commission to register all the shares which were available for the 2011 LTI Plan. During the first six months of 2015, a total of 189,705 non-qualified stock options and 53,071 shares of restricted stock were granted under the 2011 LTI Plan. Compensation expense of $757 and $1,388 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 2015, respectively, as compared to the compensation expense of $670 and $1,160 related to the nonvested awards under the 2006 Stock Option Plan incurred for the second quarter and first six months of 2014, 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, 2015, and the changes during the first six months of 2015 are presented below: Six Months Ended June 30, 2015 Weighted Average Shares Aggregate Remaining Exercise Outstanding at January 1, 2015 1,380,548 $ 27.94 Granted 189,705 36.92 Exercised (147,419 ) 30.37 Forfeited or expired (11,961 ) 32.07 Outstanding at June 30, 2015 1,410,873 $ 16,128 6.0 $ 28.80 Exercisable at June 30, 2015 973,140 $ 12,480 4.7 $ 27.41 The following table summarizes the status of United’s nonvested stock option awards during the first six months of 2015: Shares Weighted-Average Nonvested at January 1, 2015 377,264 $ 6.29 Granted 189,705 7.23 Vested (120,423 ) 6.34 Forfeited or expired (8,813 ) 6.53 Nonvested at June 30, 2015 437,733 $ 6.68 During the six months ended June 30, 2015 and 2014, 147,419 and 334,662 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, 2015 were issued from authorized and unissued stock. All shares issued in connection with stock option exercises for the six months ended June 30, 2014 were issued from available treasury stock. The total intrinsic value of options exercised under the Plans during the six months ended June 30, 2015 and 2014 was $1,100 and $3,757 respectively. Restricted Stock Under the 2011 LTI Plan, United may award restricted common shares to key employees and non-employee directors. Restricted shares granted to participants have a four-year time-based vesting period. Recipients of restricted shares do not pay any consideration to United for the shares, have the right to vote all shares subject to such grant and receive all dividends with respect to such shares, whether or not the shares have vested. Presently, these nonvested participating securities have an immaterial impact on diluted earnings per share. The following summarizes the changes to United’s restricted common shares for the period ended June 30, 2015: Number of Weighted-Average Outstanding at January 1, 2015 120,308 $ 28.29 Granted 53,071 36.92 Vested (38,041 ) 28.31 Forfeited (2,468 ) 30.25 Outstanding at June 30, 2015 132,870 $ 31.70

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2015
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 the Virginia Commerce acquisition, 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, 2014 were the following amounts that have not yet been recognized in net periodic pension cost: unrecognized prior service costs of $1 ($1 net of tax) and unrecognized actuarial losses of $58,576 ($38,074 net of tax). The amortization of these items expected to be recognized in net periodic pension cost during the fiscal year ended December 31, 2015 is $1 ($1 net of tax), and $4,900 ($3,185 net of tax), respectively. Net periodic pension cost for the three and six months ended June 30, 2015 and 2014 included the following components: Three Months Ended June 30 Six Months Ended June 30 2015 2014 2015 2014 Service cost $ 748 $ 574 $ 1,488 $ 1,141 Interest cost 1,446 1,346 2,876 2,678 Expected return on plan assets (2,319 ) (2,269 ) (4,612 ) (4,513 ) Amortization of transition asset 0 0 0 0 Recognized net actuarial loss 1,222 486 2,430 967 Amortization of prior service cost 0 0 0 0 Net periodic pension (benefit) cost $ 1,097 $ 137 $ 2,182 $ 273 Weighted-Average Assumptions: Discount rate 4.35 % 5.20 % 4.35 % 5.20 % Expected return on assets 7.50 % 7.50 % 7.50 % 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, 2015
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, 2015, United has provided a liability for $4,017 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 and 2013 and State Taxing authorities for the years ended December 31, 2010 through 2013. As of June 30, 2015 and 2014, the total amount of accrued interest related to uncertain tax positions was $728 and $512, 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, 2015
Equity [Abstract]
Comprehensive Income	16. COMPREHENSIVE INCOME The components of total comprehensive income for the three and six months ended June 30, 2015 and 2014 are as follows: Three Months Ended Six Months Ended 2015 2014 2015 2014 Net Income $ 34,809 $ 33,247 $ 69,436 $ 63,371 Available for sale (“AFS”) securities: AFS securities with OTTI charges during the period 0 (421 ) (100 ) (1,060 ) Related income tax effect 0 147 36 371 Income tax rate change 316 0 316 0 Less : OTTI charges recognized in net income 0 421 34 1,060 Related income tax benefit 0 (147 ) (12 ) (371 ) Reclassification of previous noncredit OTTI to credit OTTI 0 421 0 2,106 Related income tax benefit 0 (147 ) 0 (737 ) Net unrealized (losses) gains on AFS securities with OTTI 316 274 274 1,369 AFS securities – all other: Change in net unrealized gain on AFS securities arising during the period (10,053 ) 12,526 (1,582 ) 24,581 Related income tax effect 3,639 (4,385 ) 573 (8,604 ) Net reclassification adjustment for (gains) losses included in net income (3 ) (1 ) (49 ) (825 ) Related income tax expense (benefit) 1 1 18 289 (6,416 ) 8,141 (1,040 ) 15,441 Net effect of AFS securities on other comprehensive income (6,100 ) 8,415 (766 ) 16,810 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 4 3 5 4 Related income tax expense (2 ) (2 ) (2 ) (2 ) Net effect of HTM securities on other comprehensive income 2 1 3 2 Pension plan: Recognized net actuarial loss 1,222 486 2,430 967 Related income tax benefit (454 ) (176 ) (894 ) (348 ) Net effect of change in pension plan asset on other comprehensive income 768 310 1,536 619 Total change in other comprehensive income (5,330 ) 8,726 773 17,431 Total Comprehensive Income $ 29,479 $ 41,973 $ 70,209 $ 80,802 The components of accumulated other comprehensive income for the six months ended June 30, 2015 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2015 (Dollars in thousands) Unrealized Accretion on Defined Items Total Balance at January 1, 2015 $ 1,553 ($ 62 ) ($ 37,255 ) ($ 35,764 ) Other comprehensive income before reclassification (735 ) 3 0 (732 ) Amounts reclassified from accumulated other comprehensive income (31 ) 0 1,536 1,505 Net current-period other comprehensive income, net of tax (766 ) 3 1,536 773 Balance at June 30, 2015 $ 787 ($ 59 ) ($ 35,719 ) ($ 34,991 ) (a) All amounts are net-of-tax. Reclassifications out of Accumulated Other Comprehensive Income (AOCI) For the Six Months Ended June 30, 2015 (Dollars in thousands) Details about AOCI Components Amount from AOCI Affected Line Item in the Statement Where Net Income is Presented Available for sale (“AFS”) securities: Reclassification of previous noncredit OTTI to credit OTTI $ 0 Total other-than-temporary impairment losses Net reclassification adjustment for losses (gains) included in net income (49 ) Net gains on sales/calls of investment securities (49 ) Total before tax Related income tax effect 18 Tax expense (31 ) Net of tax Pension plan: Recognized net actuarial loss 2,430 (a) 2,430 Total before tax Related income tax effect (894 ) Tax expense 1,536 Net of tax Total reclassifications for the period $ 1,505 (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, 2015
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 June 30 Six Months Ended June 30 2015 2014 2015 2014 Distributed earnings allocated to common stock $ 22,189 $ 22,124 $ 44,356 $ 44,160 Undistributed earnings allocated to common stock 12,558 11,065 24,957 19,093 Net earnings allocated to common shareholders $ 34,747 $ 33,189 $ 69,313 $ 63,253 Average common shares outstanding 69,305,612 68,956,123 69,256,831 65,713,854 Equivalents from stock options 281,805 197,909 275,008 235,601 Average diluted shares outstanding 69,587,417 69,154,032 69,531,839 65,949,455 Earnings per basic common share $ 0.50 $ 0.48 $ 1.00 $ 0.96 Earnings per diluted common share $ 0.50 $ 0.48 $ 1.00 $ 0.96

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2015
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. During the fourth quarter of 2014, United redeemed the trust preferred securities listed below. The Federal Reserve Board did not object to the redemption of the securities. The redemptions were funded with excess cash that was available to United. Trust Interest Redemption Principal Amount Principal Amount Redemption Date Sequoia Capital Trust I 10.18 % 103.563 % $ 2,000 $ 2,000 December 8, 2014 VCBI Capital Trust IV 10.20 % 100.000 % $ 25,000 $ 25,000 December 30, 2014 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 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, 2015 As of December 31, 2014 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 240,411 $ 232,483 $ 7,928 $ 241,147 $ 233,222 $ 7,925 (1) Represents investment in VIEs.

General (Policies)

General (Policies)	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
New Accounting Standards	New Accounting Standards 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 provision 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 is effective for United on January 1, 2016. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016. Management is currently evaluating this guidance to determine the impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016 and is not expected to have a significant impact on the Company’s financial condition or results of operation. 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 is effective for United on January 1, 2016, and is not expected to have a significant impact on the Company’s financial condition or results of operation. 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 operation.
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 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, 2015
Business Combinations [Abstract]
Schedule of Acquired Loans Accounted for at Fair value	In conjunction with the Virginia Commerce merger, the acquired loan portfolio was accounted for at fair value as follows: January 31, Contractually required principal and interest at acquisition $ 2,685,339 Contractual cash flows not expected to be collected (396,024 ) Expected cash flows at acquisition 2,289,315 Interest component of expected cash flows (274,539 ) Basis in acquired loans at acquisition – estimated fair value $ 2,014,776
Schedule of Acquired Identifiable Assets and Liabilities Assumed	The following table shows the consideration paid for Virginia Commerce’s common equity and the amounts of acquired identifiable assets and liabilities assumed as of the Acquisition Date. Purchase price: Value of common shares issued (18,330,347 shares) $ 547,894 Fair value of stock options assumed 4,368 Cash to redeem the Treasury warrant 33,263 Cash for fractional shares 8 Total purchase price 585,533 Identifiable assets: Cash and cash equivalents 130,569 Investment securities 476,541 Loans 2,014,776 Premises and equipment 10,786 Core deposit intangibles 17,143 Other assets 104,131 Total identifiable assets $ 2,753,946 Identifiable liabilities: Deposits $ 2,024,969 Short-term borrowings 263,816 Long-term borrowings 204,335 Other liabilities 11,395 Total identifiable liabilities 2,504,515 Net assets acquired including identifiable intangible assets 249,431 Resulting goodwill $ 336,102
Schedule of Acquired Reconciliation of Goodwill	The following table provides a reconciliation of goodwill: Goodwill at December 31, 2014 $ 709,794 Addition to goodwill from Virginia Commerce acquisition 458 Goodwill at June 30, 2015 $ 710,252

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2015
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, 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 $ 78,742 $ 1,850 $ 1 $ 80,591 $ 0 State and political subdivisions 135,206 2,194 464 136,936 0 Residential mortgage-backed securities Agency 512,276 8,621 467 520,430 0 Non-agency 10,249 557 0 10,806 458 Commercial mortgage-backed securities Agency 309,385 2,673 1,441 310,617 0 Asset-backed securities 8,003 0 3 8,000 0 Trust preferred collateralized debt obligations 50,014 673 14,046 36,641 25,952 Single issue trust preferred securities 13,785 217 1,928 12,074 0 Other corporate securities 4,998 88 0 5,086 0 Marketable equity securities 4,982 653 7 5,628 0 Total $ 1,127,640 $ 17,526 $ 18,357 $ 1,126,809 $ 26,410 December 31, 2014 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 $ 88,559 $ 1,425 $ 3 $ 89,981 $ 0 State and political subdivisions 133,730 3,165 32 136,863 0 Residential mortgage-backed securities Agency 547,825 8,407 547 555,685 0 Non-agency 11,474 544 0 12,018 458 Commercial mortgage-backed securities Agency 316,707 2,393 2,001 317,099 0 Asset-backed securities 8,004 23 0 8,027 0 Trust preferred collateralized debt obligations 51,328 922 12,692 39,558 25,886 Single issue trust preferred securities 13,760 173 2,189 11,744 0 Other corporate securities 4,998 137 0 5,135 0 Marketable equity securities 3,631 648 3 4,276 0 Total $ 1,180,016 $ 17,837 $ 17,467 $ 1,180,386 $ 26,344 (1) 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, 2015 and December 31, 2014. Less than 12 months 12 months or longer Fair Unrealized Fair Unrealized Value Losses Value Losses June 30, 2015 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 0 $ 0 $ 69 $ 1 State and political subdivisions 26,805 464 0 0 Residential mortgage-backed securities Agency 66,915 467 0 0 Commercial mortgage-backed securities Agency 100,274 881 44,707 560 Asset-backed securities 8,000 3 0 0 Trust preferred collateralized debt obligations 0 0 30,352 14,046 Single issue trust preferred securities 0 0 8,361 1,928 Marketable equity securities 20 7 0 0 Total $ 202,014 $ 1,822 $ 83,489 $ 16,535 December 31, 2014 U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 7,142 $ 3 $ 0 $ 0 State and political subdivisions 11,637 32 0 0 Residential mortgage-backed securities Agency 96,550 547 0 0 Commercial mortgage-backed securities Agency 21,674 56 146,897 1,945 Asset-backed securities 0 0 0 0 Trust preferred collateralized debt obligations 0 0 32,241 12,692 Single issue trust preferred securities 0 0 8,080 2,189 Marketable equity securities 23 3 0 0 Total $ 137,026 $ 641 $ 187,218 $ 16,826
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 2015 2014 2015 2014 Proceeds from sales and calls $ 51,381 $ 175,451 $ 87,468 $ 435,883 Gross realized gains 4 3 54 1,052 Gross realized losses 1 2 5 227
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, 2015: Amortized Cost Class Amortized Cost Fair Value Unrealized Loss Investment Split Below Senior – Bank $ 6,879 $ 5,968 $ 911 $ 4,667 $ 0 $ 2,212 Mezzanine – Bank (now in senior position) 11,864 9,212 2,652 0 0 11,864 Mezzanine – Bank 26,090 17,585 8,505 0 0 26,090 Mezzanine – Bank & Insurance (combination) 5,181 3,876 1,305 0 0 5,181 Totals $ 50,014 $ 36,641 $ 13,373 $ 4,667 $ 0 $ 45,347
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 2015 2014 2015 2014 Balance of cumulative credit losses at beginning of period $ 23,773 $ 33,661 $ 23,739 $ 40,663 Addition for credit losses recognized in earnings during the period: Additional credit losses on securities for which OTTI was previously recognized 0 421 34 1,024 Reductions for securities sold or paid off during the period 0 0 0 (7,605 ) Balance of cumulative credit losses at end of period $ 23,773 $ 34,082 $ 23,773 $ 34,082
Summary of Amortized Cost and Estimated Fair Values of Securities Held to Maturity	he amortized cost and estimated fair values of securities held to maturity are summarized as follows: June 30, 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 $ 10,514 $ 1,137 $ 0 $ 11,651 State and political subdivisions 9,190 24 310 8,904 Residential mortgage-backed securities Agency 37 7 0 44 Single issue trust preferred securities 19,289 0 3,208 16,081 Other corporate securities 20 0 0 20 Total $ 39,050 $ 1,168 $ 3,518 $ 36,700 December 31, 2014 Gross Gross Estimated Amortized Unrealized Unrealized Fair Cost Gains Losses Value U.S. Treasury securities and obligations of U.S. Government corporations and agencies $ 10,599 $ 1,329 $ 0 $ 11,928 State and political subdivisions 9,369 32 294 9,107 Residential mortgage-backed securities Agency 41 7 0 48 Single issue trust preferred securities 19,281 0 3,600 15,681 Other corporate securities 20 0 0 20 Total $ 39,310 $ 1,368 $ 3,894 $ 36,784
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, 2015 and December 31, 2014 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, 2015 December 31, 2014 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 19,750 $ 19,867 $ 38,358 $ 38,727 Due after one year through five years 266,710 267,853 180,821 181,930 Due after five years through ten years 222,314 226,797 313,863 317,663 Due after ten years 613,884 606,664 643,343 637,790 Marketable equity securities 4,982 5,628 3,631 4,276 Total $ 1,127,640 $ 1,126,809 $ 1,180,016 $ 1,180,386
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, 2015 and December 31, 2014 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, 2015 December 31, 2014 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 5,248 $ 5,480 $ 360 $ 361 Due after one year through five years 9,347 10,266 14,499 15,848 Due after five years through ten years 4,293 3,991 4,293 4,007 Due after ten years 20,162 16,963 20,158 16,568 Total $ 39,050 $ 36,700 $ 39,310 $ 36,784

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2015
Receivables [Abstract]
Major Classes of Loans	Major classes of loans are as follows: June 30, 2015 December 31, Commercial, financial and agricultural: Owner-occupied commercial real estate $ 962,615 $ 1,016,364 Nonowner-occupied commercial real estate 2,719,910 2,760,189 Other commercial loans 1,607,719 1,577,438 Total commercial, financial & agricultural 5,290,244 5,353,991 Residential real estate 2,248,037 2,263,354 Construction & land development 1,162,742 1,133,251 Consumer: Bankcard 10,428 10,437 Other consumer 385,850 358,459 Total gross loans $ 9,097,301 $ 9,119,492
Activity for Accretable Yield	Activity for the accretable yield for the first six months of 2015 follows: Accretable yield at the beginning of the period $ 11,339 Accretion (including cash recoveries) (5,872 ) Net reclassifications to accretable from non-accretable 7,549 Disposals (including maturities, foreclosures, and charge-offs) (580 ) Accretable yield at the end of the period $ 12,436

Credit Quality (Tables)

Credit Quality (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 and 2014, segregated by class of loans: Troubled Debt Restructurings For the Three Months Ended June 30, 2015 June 30, 2014 Number of Pre- Modification Post- Number of Pre- Modification Post- Commercial real estate: Owner-occupied 0 $ 0 $ 0 0 $ 0 $ 0 Nonowner-occupied 1 669 669 0 0 0 Other commercial 0 0 0 2 5,630 5,630 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 1 $ 669 $ 669 2 $ 5,630 $ 5,630 The following table sets forth United’s troubled debt restructurings that have been restructured during the six months ended June 30, 2015 and 2014, segregated by class of loans: Troubled Debt Restructurings For the Six Months Ended June 30, 2015 June 30, 2014 Number of Pre- Modification Post- Number of Pre- Modification Post- Commercial real estate: Owner-occupied 0 $ 0 $ 0 0 $ 0 $ 0 Nonowner-occupied 1 669 669 0 0 0 Other commercial 1 240 240 2 5,630 5,630 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 $ 909 $ 909 2 $ 5,630 $ 5,630
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, 2015 30-89 90 Days or more Past Due Total Past Current & Total Financing Recorded Commercial real estate: Owner-occupied $ 6,907 $ 13,228 $ 20,135 $ 942,480 $ 962,615 $ 585 Nonowner-occupied 33,582 22,233 55,815 2,664,095 2,719,910 3,414 Other commercial 22,238 25,266 47,504 1,560,215 1,607,719 3,453 Residential real estate 35,357 30,279 65,636 2,182,401 2,248,037 2,648 Construction & land development 6,449 15,858 22,307 1,140,435 1,162,742 425 Consumer: Bankcard 214 166 380 10,048 10,428 166 Other consumer 6,878 1,285 8,163 377,687 385,850 944 Total $ 111,625 $ 108,315 $ 219,940 $ 8,877,361 $ 9,097,301 $ 11,635 (1) Other includes loans with a recorded investment of $162,073 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, 2014 30-89 90 Days Total Past Current & Total Financing Recorded Commercial real estate: Owner-occupied $ 4,158 $ 13,582 $ 17,740 $ 998,624 $ 1,016,364 $ 1,039 Nonowner-occupied 10,627 14,859 25,486 2,734,703 2,760,189 45 Other commercial 17,348 17,975 35,323 1,542,115 1,577,438 3,034 Residential real estate 40,793 25,544 66,337 2,197,017 2,263,354 5,417 Construction & land development 5,329 17,119 22,448 1,110,803 1,133,251 648 Consumer: Bankcard 471 114 585 9,852 10,437 114 Other consumer 8,992 1,727 10,719 347,740 358,459 1,378 Total $ 87,718 $ 90,920 $ 178,638 $ 8,940,854 $ 9,119,492 $ 11,675 (1) Other includes loans with a recorded investment of $176,339 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, 2015 December 31, 2014 Commercial real estate: Owner-occupied $ 12,643 $ 12,543 Nonowner-occupied 18,819 14,814 Other commercial 21,813 14,941 Residential real estate 27,631 20,127 Construction & land development 15,433 16,471 Consumer: Bankcard 0 0 Other consumer 341 349 Total $ 96,680 $ 79,245
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, 2015 Commercial Real Estate Other Construction Owner- Nonowner- Grade: Pass $ 871,955 $ 2,547,470 $ 1,453,495 $ 993,568 Special mention 19,006 37,040 25,093 61,078 Substandard 71,654 135,400 123,302 108,096 Doubtful 0 0 5,829 0 Total $ 962,615 $ 2,719,910 $ 1,607,719 $ 1,162,742 As of December 31, 2014 Commercial Real Estate Other Construction Owner- Nonowner- Grade: Pass $ 920,981 $ 2,592,783 $ 1,407,853 $ 966,335 Special mention 26,181 48,382 20,776 64,597 Substandard 69,202 119,024 147,494 102,319 Doubtful 0 0 1,315 0 Total $ 1,016,364 $ 2,760,189 $ 1,577,438 $ 1,133,251 Credit Quality Indicators Consumer Credit Exposure As of June 30, 2015 Residential Bankcard Other Grade: Pass $ 2,165,134 $ 10,047 $ 377,467 Special mention 16,609 215 6,988 Substandard 64,800 166 1,395 Doubtful 1,494 0 0 Total $ 2,248,037 $ 10,428 $ 385,850 As of December 31, 2014 Residential Bankcard Other Grade: Pass $ 2,176,655 $ 9,852 $ 347,442 Special mention 18,254 471 9,113 Substandard 66,973 114 1,904 Doubtful 1,472 0 0 Total $ 2,263,354 $ 10,437 $ 358,459
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, 2015 December 31, 2014 Recorded Unpaid Related Recorded Unpaid Related With no related allowance recorded: Commercial real estate: Owner-occupied $ 43,920 $ 44,133 $ 0 $ 37,811 $ 37,811 $ 0 Nonowner-occupied 71,073 71,538 0 48,126 48,462 0 Other commercial 35,676 37,389 0 38,521 40,329 0 Residential real estate 31,368 32,133 0 31,262 31,930 0 Construction & land development 33,500 37,481 0 64,945 68,799 0 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 30 30 0 41 41 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,616 $ 4,616 $ 1,099 $ 5,014 $ 5,014 $ 776 Nonowner-occupied 6,727 6,727 1,347 6,994 6,994 797 Other commercial 19,692 23,193 11,887 17,554 20,554 7,168 Residential real estate 7,548 8,869 3,577 6,028 7,349 2,578 Construction & land development 11,686 15,415 3,859 10,779 14,189 3,627 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 0 0 0 0 0 0 Total: Commercial real estate: Owner-occupied $ 48,536 $ 48,749 $ 1,099 $ 42,825 $ 42,825 $ 776 Nonowner-occupied 77,800 78,265 1,347 55,120 55,456 797 Other commercial 55,368 60,582 11,887 56,075 60,883 7,168 Residential real estate 38,916 41,002 3,577 37,290 39,279 2,578 Construction & land development 45,186 52,896 3,859 75,724 82,988 3,627 Consumer: Bankcard 0 0 0 0 0 0 Other consumer 30 30 0 41 41 0 Impaired Loans For the Three Months Ended June 30, 2015 June 30, 2014 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 43,898 $ 117 $ 37,654 $ 425 Nonowner-occupied 66,936 354 63,135 154 Other commercial 35,659 140 31,403 147 Residential real estate 30,867 97 30,535 96 Construction & land development 36,722 80 47,169 68 Consumer: Bankcard 0 0 0 0 Other consumer 35 0 42 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,789 $ 20 $ 3,695 $ 34 Nonowner-occupied 6,847 7 7,794 46 Other commercial 19,764 154 12,234 82 Residential real estate 7,119 18 7,880 29 Construction & land development 10,740 58 10,328 12 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 152 0 Total: Commercial real estate: Owner-occupied $ 48,687 $ 137 $ 41,349 $ 459 Nonowner-occupied 73,783 361 70,929 200 Other commercial 55,423 294 43,637 229 Residential real estate 37,986 115 38,415 125 Construction & land development 47,462 138 57,497 80 Consumer: Bankcard 0 0 0 0 Other consumer 35 0 194 0 Impaired Loans For the Six Months Ended June 30, 2015 June 30, 2014 Average Interest Average Interest With no related allowance recorded: Commercial real estate: Owner-occupied $ 40,294 $ 179 $ 26,752 $ 488 Nonowner-occupied 61,290 517 44,110 210 Other commercial 32,580 240 24,368 158 Residential real estate 31,912 146 24,369 149 Construction & land development 45,541 159 36,118 137 Consumer: Bankcard 0 0 0 0 Other consumer 40 0 28 0 With an allowance recorded: Commercial real estate: Owner-occupied $ 4,936 $ 58 $ 3,916 $ 75 Nonowner-occupied 7,112 46 8,313 92 Other commercial 19,083 218 12,680 88 Residential real estate 6,692 29 7,810 93 Construction & land development 10,833 92 10,569 16 Consumer: Bankcard 0 0 0 0 Other consumer 0 0 152 0 Total: Commercial real estate: Owner-occupied $ 45,230 $ 237 $ 30,668 $ 563 Nonowner-occupied 68,402 563 52,423 302 Other commercial 51,663 458 37,048 246 Residential real estate 38,604 175 32,179 242 Construction & land development 56,374 251 46,687 153 Consumer: Bankcard 0 0 0 0 Other consumer 40 0 180 0

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 Commercial Real Estate Other Residential Construction Consumer Allowance for Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 4,406 $ 7,670 $ 28,587 $ 14,557 $ 16,945 $ 3,251 $ 157 $ 75,573 Charge-offs 507 157 3,801 1,509 2 651 0 6,627 Recoveries 18 20 85 208 62 160 0 553 Provision 330 (237 ) 3,605 1,664 (30 ) 409 (25 ) 5,716 Ending balance $ 4,247 $ 7,296 $ 28,476 $ 14,920 $ 16,975 $ 3,169 $ 132 $ 75,215 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2015 Commercial Real Estate Other Residential Construction Consumer Allowance for Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 4,041 $ 8,167 $ 26,931 $ 13,835 $ 19,402 $ 3,083 $ 70 $ 75,529 Charge-offs 4,128 327 4,052 2,132 771 1,325 0 12,735 Recoveries 120 38 196 271 387 339 0 1,351 Provision 4.214 (582 ) 5,401 2,946 (2,043 ) 1,072 62 11,070 Ending balance $ 4,247 $ 7,296 $ 28,476 $ 14,920 $ 16,975 $ 3,169 $ 132 $ 75,215 Ending Balance: individually evaluated for impairment $ 1,098 $ 1,347 $ 11,887 $ 3,578 $ 3,859 $ 0 $ 0 $ 21,769 Ending Balance: collectively evaluated for impairment $ 3,149 $ 5,949 $ 16,589 $ 11,342 $ 13,116 $ 3,169 $ 132 $ 53,446 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Allowance for Loan Losses and Carrying Amount of Loans For the Six Months Ended June 30, 2015 Commercial Real Estate Allowance for Owner- Nonowner- Other Residential Estate Construction Consumer Total Financing receivables: Ending balance $ 962,615 $ 2,719,910 $ 1,607,719 $ 2,248,037 $ 1,162,742 $ 396,278 $ 0 $ 9,097,301 Ending Balance: individually evaluated for impairment $ 13,890 $ 22,281 $ 28,798 $ 16,994 $ 17,455 $ 0 $ 0 $ 99,418 Ending Balance: collectively evaluated for impairment $ 920,376 $ 2,643,554 $ 1,554,816 $ 2,213,383 $ 1,107,442 $ 396,239 $ 0 $ 8,835,810 Ending Balance: loans acquired with deteriorated credit quality $ 28,349 $ 54,075 $ 24,105 $ 17,660 $ 37,845 $ 39 $ 0 $ 162,073 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2014 Commercial Real Estate Other Residential Construction Consumer Allowance Total Owner- Nonowner- Allowance for Loan Losses: Beginning balance $ 5,653 $ 8,992 $ 20,917 $ 16,694 $ 18,953 $ 2,945 $ 44 $ 74,198 Charge-offs 3,073 2,097 4,947 5,027 7,476 2,621 0 25,241 Recoveries 2,372 268 294 573 685 443 0 4,635 Provision (911 ) 1,004 10,667 1,595 7,240 2,316 26 21,937 Ending balance $ 4,041 $ 8,167 $ 26,931 $ 13,835 $ 19,402 $ 3,083 $ 70 $ 75,529 Ending Balance: individually evaluated for impairment $ 776 $ 797 $ 7,168 $ 2,578 $ 3,627 $ 0 $ 0 $ 14,946 Ending Balance: collectively evaluated for impairment $ 3,265 $ 7,370 $ 19,763 $ 11,257 $ 15,775 $ 3,083 $ 70 $ 60,583 Ending Balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Allowance for Loan Losses and Carrying Amount of Loans For the Year Ended December 31, 2014 Commercial Real Estate Other Residential Estate Construction Consumer Allowance Total Owner- Nonowner- Financing receivables: Ending balance $ 1,016,364 $ 2,760,189 $ 1,577,438 $ 2,263,354 $ 1,133,251 $ 368,896 $ 0 $ 9,119,492 Ending Balance: individually evaluated for impairment $ 12,869 $ 13,733 $ 27,491 $ 16,189 $ 17,168 $ 0 $ 0 $ 87,450 Ending Balance: collectively evaluated for impairment $ 971,408 $ 2,692,374 $ 1,523,504 $ 2,227,605 $ 1,071,966 $ 368,846 $ 0 $ 8,855,703 Ending Balance: loans acquired with deteriorated credit quality $ 32,087 $ 54,082 $ 26,443 $ 19,560 $ 44,117 $ 50 $ 0 $ 176,339

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 Gross Carrying Accumulated Net Carrying Amortized intangible assets: Core deposit intangible assets $ 60,577 ($ 41,027 ) $ 19,550 Goodwill not subject to amortization $ 710,252 As of December 31, 2014 Gross Carrying Accumulated Net Carrying Amortized intangible assets: Core deposit intangible assets $ 60,577 ($ 39,317 ) $ 21,260 Goodwill not subject to amortization $ 709,794
Schedule of Anticipated Amortization Expense	The following table sets forth the anticipated amortization expense for intangible assets for the years subsequent to 2014: Year Amount 2015 $ 3,420 2016 2,981 2017 2,767 2018 2,574 2019 and thereafter 9,518

Long-Term Borrowings (Tables)

Long-Term Borrowings (Tables)	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Schedule of Maturities of FHLB Borrowings	The scheduled maturities of these FHLB borrowings are as follows: Year Amount 2015 $ 669,012 2016 627 2017 301 2018 0 2019 and thereafter 35,000 Total $ 704,940

Derivative Financial Instrume35

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015. Derivative Classifications and Hedging Relationships June 30, 2015 Notional Amount Average Pay Rate Fair Value Hedges: Pay Fixed Swaps (Hedging Commercial Loans) $ 36,802 3.44 % Total Derivatives Used in Fair Value Hedges $ 36,802 Total Derivatives Used for Interest Rate Risk Management and Designated as Hedges $ 36,802
Schedule of Fair Value Derivative Financial Instruments	The following tables summarize the fair value of United’s derivative financial instruments. Asset Derivatives June 30, 2015 December 31, 2014 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other assets $ 72 Other assets $ 90 Total derivatives designated as hedging instruments $ 72 $ 90 Derivatives not designated as hedging instruments Interest rate contracts Other assets $ 3,099 Other assets $ 3,704 Total derivatives not designated as hedging instruments $ 3,099 $ 3,704 Total asset derivatives $ 3,171 $ 3,794 Liability Derivatives June 30, 2015 December 31, 2014 Balance Sheet Location Fair Value Balance Sheet Location Fair Value Derivatives designated as hedging instruments Interest rate contracts Other liabilities $ 191 Other liabilities $ 432 Total derivatives designated as hedging instruments $ 191 $ 432 Derivatives not designated as hedging instruments Interest rate contracts Other liabilities $ 3,099 Other liabilities $ 3,704 Total derivatives not designated as hedging instruments $ 3,099 $ 3,704 Total liability derivatives $ 3,290 $ 4,136
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, 2015 and 2014 are presented as follows: Three Months Ended Income Statement Location June 30, June 30, Derivatives in fair value hedging relationships Interest rate contracts Interest income/ (expense) $ 96 $ (273 ) Total derivatives in fair value hedging relationships $ 96 $ (273 ) 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 $ 96 $ (273 ) Six Months Ended Income Statement Location June 30, June 30, Derivatives in fair value hedging relationships Interest rate contracts Interest income/ (expense) $ (328 ) $ (524 ) Total derivatives in fair value hedging relationships $ (328 ) $ (524 ) 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 $ (328 ) $ (524 ) (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, 2015
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, 2015 and December 31, 2014, segregated by the level of the valuation inputs within the fair value hierarchy. Fair Value at June 30, 2015 Using Description Balance as of June 30, 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 $ 80,591 $ 0 $ 80,591 $ 0 State and political subdivisions 136,936 0 136,936 0 Residential mortgage-backed securities Agency 520,430 0 520,430 0 Non-agency 10,806 0 10,806 0 Asset-backed securities 8,000 0 8,000 0 Commercial mortgage-backed securities Agency 310,617 0 310,617 0 Trust preferred collateralized debt obligations 36,641 0 0 36,641 Single issue trust preferred securities 12,074 0 12,074 0 Other corporate securities 5,086 0 5,086 0 Total available for sale debt securities 1,121,181 0 1,084,540 36,641 Available for sale equity securities: Financial services industry 3,671 810 2,861 0 Equity mutual funds (1) 759 759 0 0 Other equity securities 1,198 1,198 0 0 Total available for sale equity securities 5,628 2,767 2,861 0 Total available for sale securities 1,126,809 2,767 1,087,401 36,641 Derivative financial assets: Interest rate contracts 3,171 0 3,171 0 Liabilities Derivative financial liabilities: Interest rate contracts 3,290 0 3,290 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, 2014 Using Description Balance as of December 31, 2014 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 $ 89,981 $ 0 $ 89,981 $ 0 State and political subdivisions 136,863 0 136,863 0 Residential mortgage-backed securities Agency 555,685 0 555,685 0 Non-agency 12,018 0 12,018 0 Asset-backed securities 8,027 0 8,027 0 Commercial mortgage-backed securities Agency 317,099 0 317,099 0 Trust preferred collateralized debt obligations 39,558 0 0 39,558 Single issue trust preferred securities 11,744 0 11,744 0 Other corporate securities 5,135 0 5,135 0 Total available for sale debt securities 1,176,110 0 1,136,552 39,558 Available for sale equity securities: Financial services industry 2,533 759 1,774 0 Equity mutual funds (1) 560 560 0 0 Other equity securities 1,183 1,183 0 0 Total available for sale equity securities 4,276 2,502 1,774 0 Total available for sale securities 1,180,386 2,502 1,138,326 39,558 Derivative financial assets: Interest rate contracts 3,794 0 3,794 0 Liabilities Derivative financial liabilities: Interest rate contracts 4,136 0 4,136 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, 2015 and December 31, 2014 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, 2015 December 31, Balance, beginning of period $ 39,558 $ 43,449 Total gains or losses (realized/unrealized): Included in earnings (or changes in net assets) (34 ) (4,034 ) Included in other comprehensive income (2,883 ) 12,312 Purchases, issuances, and settlements 0 (12,169 ) Transfers in and/or out of Level 3 0 0 Balance, end of period $ 36,641 $ 39,558 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, 2015 Carrying value at June 30, 2015 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 $ 50,269 $ 0 $ 5,404 $ 44,865 $ 5,108 OREO 34,964 0 34,964 0 506 Description Balance as of December 31, 2014 Carrying value at December 31, 2014 YTD Losses Quoted Prices Significant Significant Assets Impaired Loans $ 46,369 $ 0 $ 8,518 $ 37,851 $ 7,349 OREO 38,778 0 38,778 0 3,307
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, 2015 Cash and cash equivalents $ 917,101 $ 917,101 $ 0 $ 917,101 $ 0 Securities available for sale 1,126,809 1,126,809 2,767 1,087,401 36,641 Securities held to maturity 39,050 36,700 0 34,680 2,020 Other securities 92,456 87,833 0 0 87,833 Loans held for sale 14,856 14,856 0 14,856 0 Loans 9,006,889 8,968,852 0 0 8,968,852 Derivative financial assets 3,171 3,171 0 3,171 0 Deposits 9,282,426 9,272,849 0 9,272,849 0 Short-term borrowings 383,828 383,828 0 383,828 0 Long-term borrowings 979,614 954,083 0 954,083 0 Derivative financial liabilities 3,290 3,290 0 3,290 0 December 31, 2014 Cash and cash equivalents $ 753,064 $ 753,064 $ 0 $ 753,064 $ 0 Securities available for sale 1,180,386 1,180,386 2,502 1,138,326 39,558 Securities held to maturity 39,310 36,784 0 34,764 2,020 Other securities 96,344 91,527 0 0 91,527 Loans held for sale 8,680 8,680 0 8,680 0 Loans 9,029,123 9,055,281 0 0 9,055,281 Derivative financial assets 3,794 3,794 0 3,794 0 Deposits 9,045,485 9,044,976 0 9,044,976 0 Short-term borrowings 435,652 435,652 0 435,652 0 Long-term borrowings 1,105,314 1,081,133 0 1,081,133 0 Derivative financial liabilities 4,136 4,136 0 4,136 0

Stock Based Compensation (Table

Stock Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015, and the changes during the first six months of 2015 are presented below: Six Months Ended June 30, 2015 Weighted Average Shares Aggregate Remaining Exercise Outstanding at January 1, 2015 1,380,548 $ 27.94 Granted 189,705 36.92 Exercised (147,419 ) 30.37 Forfeited or expired (11,961 ) 32.07 Outstanding at June 30, 2015 1,410,873 $ 16,128 6.0 $ 28.80 Exercisable at June 30, 2015 973,140 $ 12,480 4.7 $ 27.41
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 2015: Shares Weighted-Average Nonvested at January 1, 2015 377,264 $ 6.29 Granted 189,705 7.23 Vested (120,423 ) 6.34 Forfeited or expired (8,813 ) 6.53 Nonvested at June 30, 2015 437,733 $ 6.68
Changes to United's Restricted Common Shares	The following summarizes the changes to United’s restricted common shares for the period ended June 30, 2015: Number of Weighted-Average Outstanding at January 1, 2015 120,308 $ 28.29 Granted 53,071 36.92 Vested (38,041 ) 28.31 Forfeited (2,468 ) 30.25 Outstanding at June 30, 2015 132,870 $ 31.70

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Net Periodic Pension Cost	Net periodic pension cost for the three and six months ended June 30, 2015 and 2014 included the following components: Three Months Ended June 30 Six Months Ended June 30 2015 2014 2015 2014 Service cost $ 748 $ 574 $ 1,488 $ 1,141 Interest cost 1,446 1,346 2,876 2,678 Expected return on plan assets (2,319 ) (2,269 ) (4,612 ) (4,513 ) Amortization of transition asset 0 0 0 0 Recognized net actuarial loss 1,222 486 2,430 967 Amortization of prior service cost 0 0 0 0 Net periodic pension (benefit) cost $ 1,097 $ 137 $ 2,182 $ 273 Weighted-Average Assumptions: Discount rate 4.35 % 5.20 % 4.35 % 5.20 % Expected return on assets 7.50 % 7.50 % 7.50 % 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, 2015
Equity [Abstract]
Components of Total Comprehensive Income	The components of total comprehensive income for the three and six months ended June 30, 2015 and 2014 are as follows: Three Months Ended Six Months Ended 2015 2014 2015 2014 Net Income $ 34,809 $ 33,247 $ 69,436 $ 63,371 Available for sale (“AFS”) securities: AFS securities with OTTI charges during the period 0 (421 ) (100 ) (1,060 ) Related income tax effect 0 147 36 371 Income tax rate change 316 0 316 0 Less : OTTI charges recognized in net income 0 421 34 1,060 Related income tax benefit 0 (147 ) (12 ) (371 ) Reclassification of previous noncredit OTTI to credit OTTI 0 421 0 2,106 Related income tax benefit 0 (147 ) 0 (737 ) Net unrealized (losses) gains on AFS securities with OTTI 316 274 274 1,369 AFS securities – all other: Change in net unrealized gain on AFS securities arising during the period (10,053 ) 12,526 (1,582 ) 24,581 Related income tax effect 3,639 (4,385 ) 573 (8,604 ) Net reclassification adjustment for (gains) losses included in net income (3 ) (1 ) (49 ) (825 ) Related income tax expense (benefit) 1 1 18 289 (6,416 ) 8,141 (1,040 ) 15,441 Net effect of AFS securities on other comprehensive income (6,100 ) 8,415 (766 ) 16,810 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 4 3 5 4 Related income tax expense (2 ) (2 ) (2 ) (2 ) Net effect of HTM securities on other comprehensive income 2 1 3 2 Pension plan: Recognized net actuarial loss 1,222 486 2,430 967 Related income tax benefit (454 ) (176 ) (894 ) (348 ) Net effect of change in pension plan asset on other comprehensive income 768 310 1,536 619 Total change in other comprehensive income (5,330 ) 8,726 773 17,431 Total Comprehensive Income $ 29,479 $ 41,973 $ 70,209 $ 80,802
Components of Accumulated Other Comprehensive Income	The components of accumulated other comprehensive income for the six months ended June 30, 2015 are as follows: Changes in Accumulated Other Comprehensive Income (AOCI) by Component (a) For the Six Months Ended June 30, 2015 (Dollars in thousands) Unrealized Accretion on Defined Items Total Balance at January 1, 2015 $ 1,553 ($ 62 ) ($ 37,255 ) ($ 35,764 ) Other comprehensive income before reclassification (735 ) 3 0 (732 ) Amounts reclassified from accumulated other comprehensive income (31 ) 0 1,536 1,505 Net current-period other comprehensive income, net of tax (766 ) 3 1,536 773 Balance at June 30, 2015 $ 787 ($ 59 ) ($ 35,719 ) ($ 34,991 ) (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, 2015 (Dollars in thousands) Details about AOCI Components Amount from AOCI Affected Line Item in the Statement Where Net Income is Presented Available for sale (“AFS”) securities: Reclassification of previous noncredit OTTI to credit OTTI $ 0 Total other-than-temporary impairment losses Net reclassification adjustment for losses (gains) included in net income (49 ) Net gains on sales/calls of investment securities (49 ) Total before tax Related income tax effect 18 Tax expense (31 ) Net of tax Pension plan: Recognized net actuarial loss 2,430 (a) 2,430 Total before tax Related income tax effect (894 ) Tax expense 1,536 Net of tax Total reclassifications for the period $ 1,505 (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, 2015
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 2015 2014 2015 2014 Distributed earnings allocated to common stock $ 22,189 $ 22,124 $ 44,356 $ 44,160 Undistributed earnings allocated to common stock 12,558 11,065 24,957 19,093 Net earnings allocated to common shareholders $ 34,747 $ 33,189 $ 69,313 $ 63,253 Average common shares outstanding 69,305,612 68,956,123 69,256,831 65,713,854 Equivalents from stock options 281,805 197,909 275,008 235,601 Average diluted shares outstanding 69,587,417 69,154,032 69,531,839 65,949,455 Earnings per basic common share $ 0.50 $ 0.48 $ 1.00 $ 0.96 Earnings per diluted common share $ 0.50 $ 0.48 $ 1.00 $ 0.96

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Trust Preferred Securities Redemption	During the fourth quarter of 2014, United redeemed the trust preferred securities listed below. Trust Interest Rate Redemption Price Principal Amount Principal Amount to Redemption Date Sequoia Capital Trust I 10.18 % 103.563 % $ 2,000 $ 2,000 December 8, 2014 VCBI Capital Trust IV 10.20 % 100.000 % $ 25,000 $ 25,000 December 30, 2014
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 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, 2015 As of December 31, 2014 Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Aggregate Assets Aggregate Liabilities Risk Of Loss (1) Trust preferred securities $ 240,411 $ 232,483 $ 7,928 $ 241,147 $ 233,222 $ 7,925 (1) Represents investment in VIEs.

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) - USD ($)	Jan. 31, 2014	Jun. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Total assets at consummation		$ 12,414,566,000	$ 12,328,811,000
Loans at consummation		9,097,301,000	9,119,492,000
Deposits at consummation		9,282,426,000	9,045,485,000
Resulting goodwill		$ 710,252,000	$ 709,794,000
Contractually required principal and interest at acquisition	$ 427,858,000
Expected cash flows at acquisition	189,277,000
Estimated fair value of acquired impaired loans at acquisition	$ 179,199,000
Virginia Commerce Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Outstanding common stock acquired	100.00%
Business acquisition date		Jan. 31, 2014
Total assets at consummation	$ 2,769,716,000
Loans at consummation	2,065,490,000
Deposits at consummation	2,018,962,000
Common stock paid in cash	585,533,000
Common stock value	547,894,000
Stock options exchanged value	4,368,000
Cash to redeem the Treasury warrant	33,263,000
Resulting goodwill	336,102,000
Goodwill from acquisition expected to be tax deductible	0
Downward fair value adjustment on loans acquired	88,129,000
Downward fair value adjustment on real state properties	1,708,000
Premium on interest-bearing deposits acquired	6,007,000
Premium on term securities to purchase	3,700,000
Discount on junior subordinated debt securities acquired	16,384,000
Estimated remaining life of premium on interest-bearing deposits acquired		6 months
Estimated remaining life on premium of term securities to purchase		1 year 29 days
Estimated remaining life of discount on junior subordinated debt securities acquired		19 years 29 days
Assumed liabilities to provide severance benefits		$ 109,000
Liabilities to provide severance benefits		$ 0
Contractually required principal and interest at acquisition	2,685,339,000
Expected cash flows at acquisition	2,289,315,000
Estimated fair value of acquired impaired loans at acquisition	2,014,776,000
Virginia Commerce Bancorp, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Common stock paid in cash	8,000
Common stock value	$ 547,894,000
Number of shares issued in the transaction	18,330,347
Closing market price per common share	$ 29.89
Virginia Commerce Bancorp, Inc. [Member] | Core Deposit Intangible Assets [Member]
Business Acquisition [Line Items]
Purchase price allocation of Identifiable Intangible assets	$ 17,143,000
Estimated period of amortization of core deposit intangibles	10 years

Mergers and Acquisitions - Sche

Mergers and Acquisitions - Schedule of Acquired Loans Accounted for at Fair value (Detail) $ in Thousands	Jan. 31, 2014USD ($)
Business Acquisition [Line Items]
Contractually required principal and interest at acquisition	$ 427,858
Expected cash flows at acquisition	189,277
Basis in acquired loans at acquisition - estimated fair value	179,199
Virginia Commerce Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Contractually required principal and interest at acquisition	2,685,339
Contractual cash flows not expected to be collected	(396,024)
Expected cash flows at acquisition	2,289,315
Interest component of expected cash flows	(274,539)
Basis in acquired loans at acquisition - estimated fair value	$ 2,014,776

Mergers and Acquisitions - Sc44

Mergers and Acquisitions - Schedule of Acquired Identifiable Assets and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Jan. 31, 2014	Jun. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Resulting goodwill		$ 710,252	$ 709,794
Virginia Commerce Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Value of common shares issued (18,330,347 shares)	$ 547,894
Fair value of stock options assumed	4,368
Cash to redeem the Treasury warrant	33,263
Cash for fractional shares	8
Total purchase price	585,533
Cash and cash equivalents	130,569
Investment securities	476,541
Loans	2,014,776
Premises and equipment	10,786
Other assets	104,131
Total identifiable assets	2,753,946
Deposits	2,024,969
Short-term borrowings	263,816
Long-term borrowings	204,335
Other liabilities	11,395
Total identifiable liabilities	2,504,515
Net assets acquired including identifiable intangible assets	249,431
Resulting goodwill	336,102
Virginia Commerce Bancorp, Inc. [Member] | Core Deposit Intangible Assets [Member]
Business Acquisition [Line Items]
Core deposit intangibles	$ 17,143

Mergers and Acquisitions - Sc45

Mergers and Acquisitions - Schedule of Acquired Identifiable Assets and Liabilities Assumed (Parenthetical) (Detail) - shares	Jun. 30, 2015	Dec. 31, 2014	Jan. 31, 2014
Business Acquisition [Line Items]
Common stock, shares issued	69,514,897	69,314,407
Virginia Commerce Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Common stock, shares issued			18,330,347

Mergers and Acquisitions - Sc46

Mergers and Acquisitions - Schedule of Acquired Reconciliation of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)
Goodwill [Line Items]
Beginning balance	$ 709,794
Ending balance	710,252
Virginia Commerce Bancorp, Inc. [Member]
Goodwill [Line Items]
Addition to goodwill from Virginia Commerce acquisition	$ 458

Investment Securities - Summary

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Available for Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Amortized Cost	$ 1,127,640	$ 1,180,016
Gross Unrealized Gains	17,526	17,837
Gross Unrealized Losses	18,357	17,467
Estimated Fair Value	1,126,809	1,180,386
Cumulative OTTI in AOCI	26,410	26,344
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	78,742	88,559
Gross Unrealized Gains	1,850	1,425
Gross Unrealized Losses	1	3
Estimated Fair Value	80,591	89,981
Cumulative OTTI in AOCI	0	0
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Amortized Cost	135,206	133,730
Gross Unrealized Gains	2,194	3,165
Gross Unrealized Losses	464	32
Estimated Fair Value	136,936	136,863
Cumulative OTTI in AOCI	0	0
Residential Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	512,276	547,825
Gross Unrealized Gains	8,621	8,407
Gross Unrealized Losses	467	547
Estimated Fair Value	520,430	555,685
Cumulative OTTI in AOCI	0	0
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	10,249	11,474
Gross Unrealized Gains	557	544
Gross Unrealized Losses	0	0
Estimated Fair Value	10,806	12,018
Cumulative OTTI in AOCI	458	458
Commercial Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	309,385	316,707
Gross Unrealized Gains	2,673	2,393
Gross Unrealized Losses	1,441	2,001
Estimated Fair Value	310,617	317,099
Cumulative OTTI in AOCI	0	0
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	8,003	8,004
Gross Unrealized Gains	0	23
Gross Unrealized Losses	3	0
Estimated Fair Value	8,000	8,027
Cumulative OTTI in AOCI	0	0
Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	50,014	51,328
Gross Unrealized Gains	673	922
Gross Unrealized Losses	14,046	12,692
Estimated Fair Value	36,641	39,558
Cumulative OTTI in AOCI	25,952	25,886
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	13,785	13,760
Gross Unrealized Gains	217	173
Gross Unrealized Losses	1,928	2,189
Estimated Fair Value	12,074	11,744
Cumulative OTTI in AOCI	0	0
Other Corporate Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	4,998	4,998
Gross Unrealized Gains	88	137
Gross Unrealized Losses	0	0
Estimated Fair Value	5,086	5,135
Cumulative OTTI in AOCI	0	0
Marketable Equity Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	4,982	3,631
Gross Unrealized Gains	653	648
Gross Unrealized Losses	7	3
Estimated Fair Value	5,628	4,276
Cumulative OTTI in AOCI	$ 0	$ 0

Investment Securities - Summa48

Investment Securities - Summary of Securities Available for Sale in an Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 202,014	$ 137,026
Less than 12 months, Unrealized Losses	1,822	641
12 months or longer, Fair Value	83,489	187,218
12 months or longer, Unrealized Losses	16,535	16,826
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	7,142
Less than 12 months, Unrealized Losses	0	3
12 months or longer, Fair Value	69	0
12 months or longer, Unrealized Losses	1	0
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	26,805	11,637
Less than 12 months, Unrealized Losses	464	32
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	66,915	96,550
Less than 12 months, Unrealized Losses	467	547
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Commercial Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	100,274	21,674
Less than 12 months, Unrealized Losses	881	56
12 months or longer, Fair Value	44,707	146,897
12 months or longer, Unrealized Losses	560	1,945
Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	8,000	0
Less than 12 months, Unrealized Losses	3	0
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	0	0
Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Losses	0	0
12 months or longer, Fair Value	30,352	32,241
12 months or longer, Unrealized Losses	14,046	12,692
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	0	0
Less than 12 months, Unrealized Losses	0	0
12 months or longer, Fair Value	8,361	8,080
12 months or longer, Unrealized Losses	1,928	2,189
Marketable Equity Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	20	23
Less than 12 months, Unrealized Losses	7	3
12 months or longer, Fair Value	0	0
12 months or longer, Unrealized Losses	$ 0	$ 0

Investment Securities - Summa49

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales and calls	$ 51,381	$ 175,451	$ 87,468	$ 435,883
Gross realized gains	4	3	54	1,052
Gross realized losses	$ 1	$ 2	$ 5	$ 227

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	6 Months Ended	96 Months Ended
	Jun. 30, 2015USD ($)Securities	Dec. 31, 2007USD ($)	Dec. 31, 2014USD ($)
Schedule of Investments [Line Items]
Gross unrealized losses on available for sale securities	$ 18,357,000
Available for sale securities in unrealized loss position | Securities	90
Available for sale securities in portfolio, number | Securities	446
Amortized cost of available for sale securities	$ 1,127,640,000		$ 1,180,016,000
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	$ 26,410,000		26,344,000
New issuance of Preferred Stock estimated		$ 60,000,000,000
Security other-than-temporarily impaired	100.00%
Unrealized net gain position of securities	$ 646,000
Carrying value of securities pledged	1,059,960,000		1,081,299,000
TRUP CDOs [Member]
Schedule of Investments [Line Items]
Credit-related other-than-temporary impairment recognized in earnings	0
Noncredit-related other-than-temporary impairment recognized	25,952,000		25,886,000
Wells Fargo [Member]
Schedule of Investments [Line Items]
Amortized cost of trust preferred securities	9,911,000
SunTrust Bank [Member]
Schedule of Investments [Line Items]
Amortized cost of trust preferred securities	7,405,000
Royal Bank of Scotland [Member]
Schedule of Investments [Line Items]
Amortized cost of trust preferred securities	$ 973,000
Minimum [Member]
Schedule of Investments [Line Items]
Other-than-temporarily impaired, the collateralization ratios	97.70%
Maximum [Member]
Schedule of Investments [Line Items]
Other-than-temporarily impaired, the collateralization ratios	305.50%
Median [Member]
Schedule of Investments [Line Items]
Other-than-temporarily impaired, the collateralization ratios	144.50%
Weighted Average [Member]
Schedule of Investments [Line Items]
Other-than-temporarily impaired, the collateralization ratios	205.00%
Investment Grade [Member] | TRUP CDOs [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	$ 4,667,000
Below Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	5,676,000
Amortized cost of available for sale TRUP CDOs and single issue trust preferred securities in an unrealized loss position 12 months or longer	10,290,000
Below Investment Grade [Member] | TRUP CDOs [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	39,731,000
Split Rated [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale single issue trust preferred securities	8,109,000
Agency Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	821,661,000
Commercial Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	309,385,000		316,707,000
Noncredit-related other-than-temporary impairment recognized	0		0
Residential Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	512,276,000		547,825,000
Noncredit-related other-than-temporary impairment recognized	0		0
Residential Mortgage-Backed Securities, Non-agency [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	10,249,000		11,474,000
Credit-related other-than-temporary impairment recognized in earnings	0
Noncredit-related other-than-temporary impairment recognized in accumulated other comprehensive income (loss)	0
Noncredit-related other-than-temporary impairment recognized	$ 458,000		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	31.00%
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	69.00%
Residential Mortgage-Backed Securities, Non-agency [Member] | Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	$ 2,338,000
Residential Mortgage-Backed Securities, Non-agency [Member] | Below Investment Grade [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	7,911,000
Marketable Equity Securities [Member]
Schedule of Investments [Line Items]
Amortized cost of available for sale securities	4,982,000		3,631,000
Noncredit-related other-than-temporary impairment recognized	0		$ 0
Amortized cost	$ 4,982,000
Number of equity securities other-than-temporarily impaired | Securities	0

Investment Securities - Summa51

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, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Amortized Cost	$ 1,127,640	$ 1,180,016
Fair Value	1,126,809	$ 1,180,386
Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	50,014
Fair Value	36,641
Unrealized Loss	13,373
Senior - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	6,879
Fair Value	5,968
Unrealized Loss	911
Mezzanine - Bank (now in senior position) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	11,864
Fair Value	9,212
Unrealized Loss	2,652
Mezzanine - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	26,090
Fair Value	17,585
Unrealized Loss	8,505
Mezzanine - Bank & Insurance (combination) [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	5,181
Fair Value	3,876
Unrealized Loss	1,305
Investment Grade [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	4,667
Investment Grade [Member] | Senior - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	4,667
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	45,347
Below Investment Grade [Member] | Senior - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	2,212
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	11,864
Below Investment Grade [Member] | Mezzanine - Bank [Member] | Trup CDOs and Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	26,090
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	$ 5,181

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Cumulative credit losses, Beginning Balance	$ 23,773	$ 33,661	$ 23,739	$ 40,663
Additional credit losses on securities for which OTTI was previously recognized	0	421	34	1,024
Reductions for securities sold or paid off during the period	0	0	0	(7,605)
Cumulative credit losses, Ending Balance	$ 23,773	$ 34,082	$ 23,773	$ 34,082

Investment Securities - Summa53

Investment Securities - Summary of Maturities of Securities Available for Sale by Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 19,750	$ 38,358
Due after one year through five years, Amortized Cost	266,710	180,821
Due after five years through ten years, Amortized Cost	222,314	313,863
Due after ten years, Amortized Cost	613,884	643,343
Marketable equity securities, Amortized Cost	4,982	3,631
Amortized Cost	1,127,640	1,180,016
Due in one year or less, Estimated Fair Value	19,867	38,727
Due after one year through five years, Estimated Fair Value	267,853	181,930
Due after five years through ten years, Estimated Fair Value	226,797	317,663
Due after ten years, Estimated Fair Value	606,664	637,790
Marketable equity securities, Estimated Fair Value	5,628	4,276
Total available for sale securities	$ 1,126,809	$ 1,180,386

Investment Securities - Summa54

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Amortized Cost	$ 39,050	$ 39,310
Gross Unrealized Gains	1,168	1,368
Gross Unrealized Losses	3,518	3,894
Estimated Fair Value	36,700	36,784
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Investments [Line Items]
Amortized Cost	10,514	10,599
Gross Unrealized Gains	1,137	1,329
Gross Unrealized Losses	0	0
Estimated Fair Value	11,651	11,928
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Amortized Cost	9,190	9,369
Gross Unrealized Gains	24	32
Gross Unrealized Losses	310	294
Estimated Fair Value	8,904	9,107
Residential Mortgage-Backed Securities, Agency [Member]
Schedule of Investments [Line Items]
Amortized Cost	37	41
Gross Unrealized Gains	7	7
Gross Unrealized Losses	0	0
Estimated Fair Value	44	48
Single Issue Trust Preferred Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	19,289	19,281
Gross Unrealized Gains	0	0
Gross Unrealized Losses	3,208	3,600
Estimated Fair Value	16,081	15,681
Other Corporate Securities [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 - Summa55

Investment Securities - Summary of Maturities of Debt Securities Held to Maturity by Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, Amortized Cost	$ 5,248	$ 360
Due after one year through five years, Amortized Cost	9,347	14,499
Due after five years through ten years, Amortized Cost	4,293	4,293
Due after ten years, Amortized Cost	20,162	20,158
Amortized Cost	39,050	39,310
Due in one year or less, Estimated Fair Value	5,480	361
Due after one year through five years, Estimated Fair Value	10,266	15,848
Due after five years through ten years, Estimated Fair Value	3,991	4,007
Due after ten years, Estimated Fair Value	16,963	16,568
Estimated Fair Value, Total	$ 36,700	$ 36,784

Loans - Major Classes of Loans

Loans - Major Classes of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Commercial, financial and agricultural:
Total commercial, financial & agricultural	$ 5,290,244	$ 5,353,991
Residential real estate	2,248,037	2,263,354
Construction & land development	1,162,742	1,133,251
Consumer:
Bankcard	10,428	10,437
Other consumer	385,850	358,459
Total Financing Receivables	9,097,301	9,119,492
Owner-Occupied [Member]
Commercial, financial and agricultural:
Total commercial, financial & agricultural	962,615	1,016,364
Consumer:
Total Financing Receivables	962,615	1,016,364
Nonowner-Occupied [Member]
Commercial, financial and agricultural:
Total commercial, financial & agricultural	2,719,910	2,760,189
Consumer:
Total Financing Receivables	2,719,910	2,760,189
Other Commercial Loans [Member]
Commercial, financial and agricultural:
Total commercial, financial & agricultural	$ 1,607,719	$ 1,577,438

Loans - Additional Information

Loans - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Loans held for sale	$ 14,856	$ 8,680
Acquired impaired loans from merger	$ 9,097,301	9,119,492
Percentage of acquired impaired loans from merger on total gross loans	1.78%
Recorded investment in acquired impaired loans	$ 227,560	252,759
Related party loans	186,027	188,516
Loans Acquired with Deteriorated Credit Quality [Member]
Acquired impaired loans from merger	$ 162,073	$ 176,339
Maximum [Member]
Percentage of acquired impaired loans from merger on total gross loans		1.93%

Loans - Activity for Accretable

Loans - Activity for Accretable Yield (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015USD ($)
Loans [Abstract]
Accretable yield at the beginning of the period	$ 11,339
Accretion (including cash recoveries)	(5,872)
Net reclassifications to accretable from non-accretable	7,549
Disposals (including maturities, foreclosures, and charge-offs)	(580)
Accretable yield at the end of the period	$ 12,436

Credit Quality - Additional Inf

Credit Quality - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)SecurityLoan	Jun. 30, 2014USD ($)SecurityLoan	Dec. 31, 2014USD ($)
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			$ 21,992		$ 22,234
Loans on nonaccrual status	$ 9,837		9,837		4,194
Restructured loans modified by reduction in interest	3,913		3,913
Restructured loan and interest	8,017		8,017
Restructured loans modified by change in terms	10,062		10,062
Restructured loans modified by reduction in interest and extension of maturity	669	$ 5,630	$ 909	$ 5,630
Number of loans restructured | SecurityLoan			0	0
Minimum number of days required for special mention
Maximum number of days required for special mention
Number of days required for substandard
Real estate acquired in foreclosure or other settlement of loans	34,964		$ 34,964		38,778
Loans in process of foreclosure	$ 655		$ 655		$ 311

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, 2015USD ($)Contract	Jun. 30, 2014USD ($)Contract	Jun. 30, 2015USD ($)Contract	Jun. 30, 2014USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	2	2	2
Pre-Modification Outstanding Recorded Investment	$ 669	$ 5,630	$ 909	$ 5,630
Post-Modification Outstanding Recorded Investment	$ 669	$ 5,630	$ 909	$ 5,630
Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Nonowner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 669	$ 0	$ 669	$ 0
Post-Modification Outstanding Recorded Investment	$ 669	$ 0	$ 669	$ 0
Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	2	1	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 5,630	$ 240	$ 5,630
Post-Modification Outstanding Recorded Investment	$ 0	$ 5,630	$ 240	$ 5,630
Residential Real Estate [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
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
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
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, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	$ 111,625	$ 87,718
Loans, Total Past Due	219,940	178,638
Loans, Current & Other	8,877,361	8,940,854
Total Financing Receivables	9,097,301	9,119,492
Loans, Recorded Investment >90 Days & Accruing	11,635	11,675
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Total Past Due	108,315	90,920
Owner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	6,907	4,158
Loans, Total Past Due	20,135	17,740
Loans, Current & Other	942,480	998,624
Total Financing Receivables	962,615	1,016,364
Loans, Recorded Investment >90 Days & Accruing	585	1,039
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	13,228	13,582
Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	33,582	10,627
Loans, Total Past Due	55,815	25,486
Loans, Current & Other	2,664,095	2,734,703
Total Financing Receivables	2,719,910	2,760,189
Loans, Recorded Investment >90 Days & Accruing	3,414	45
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	22,233	14,859
Other Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	22,238	17,348
Loans, Total Past Due	47,504	35,323
Loans, Current & Other	1,560,215	1,542,115
Total Financing Receivables	1,607,719	1,577,438
Loans, Recorded Investment >90 Days & Accruing	3,453	3,034
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	25,266	17,975
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	35,357	40,793
Loans, Total Past Due	65,636	66,337
Loans, Current & Other	2,182,401	2,197,017
Total Financing Receivables	2,248,037	2,263,354
Loans, Recorded Investment >90 Days & Accruing	2,648	5,417
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	30,279	25,544
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	6,449	5,329
Loans, Total Past Due	22,307	22,448
Loans, Current & Other	1,140,435	1,110,803
Total Financing Receivables	1,162,742	1,133,251
Loans, Recorded Investment >90 Days & Accruing	425	648
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	15,858	17,119
Bankcard [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	214	471
Loans, Total Past Due	380	585
Loans, Current & Other	10,048	9,852
Total Financing Receivables	10,428	10,437
Loans, Recorded Investment >90 Days & Accruing	166	114
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	166	114
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, 30-89 Days Past Due	6,878	8,992
Loans, Total Past Due	8,163	10,719
Loans, Current & Other	377,687	347,740
Total Financing Receivables	385,850	358,459
Loans, Recorded Investment >90 Days & Accruing	944	1,378
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	$ 1,285	$ 1,727

Credit Quality - Schedule of 62

Credit Quality - Schedule of Age Analysis of its Past Due Loans, Segregated by Class of Loans (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	$ 9,097,301	$ 9,119,492
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	162,073	176,339
Loans Acquired with Deteriorated Credit Quality [Member] | Loans and Debt Securities Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Acquired impaired loans from merger	$ 162,073	$ 176,339

Credit Quality - Schedule of No

Credit Quality - Schedule of Nonaccrual Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	$ 96,680	$ 79,245
Owner-Occupied [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	12,643	12,543
Nonowner-Occupied [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	18,819	14,814
Other Commercial [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	21,813	14,941
Residential Real Estate [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	27,631	20,127
Construction & Land Development [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	15,433	16,471
Bankcard [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	0	0
Other Consumer [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Loans on Nonaccrual Status	$ 341	$ 349

Credit Quality - Schedule of Cr

Credit Quality - Schedule of Credit Quality Indicators Information, by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	$ 9,097,301	$ 9,119,492
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,248,037	2,263,354
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,165,134	2,176,655
Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	16,609	18,254
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	64,800	66,973
Residential Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,494	1,472
Bankcard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	10,428	10,437
Bankcard [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	10,047	9,852
Bankcard [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	215	471
Bankcard [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	166	114
Bankcard [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0	0
Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	385,850	358,459
Other Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	377,467	347,442
Other Consumer [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	6,988	9,113
Other Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,395	1,904
Other Consumer [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0	0
Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	962,615	1,016,364
Owner-Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	871,955	920,981
Owner-Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	19,006	26,181
Owner-Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	71,654	69,202
Owner-Occupied [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0	0
Nonowner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,719,910	2,760,189
Nonowner-Occupied [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	2,547,470	2,592,783
Nonowner-Occupied [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	37,040	48,382
Nonowner-Occupied [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	135,400	119,024
Nonowner-Occupied [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	0	0
Other Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,607,719	1,577,438
Other Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,453,495	1,407,853
Other Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	25,093	20,776
Other Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	123,302	147,494
Other Commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	5,829	1,315
Construction & Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	1,162,742	1,133,251
Construction & Land Development [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	993,568	966,335
Construction & Land Development [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	61,078	64,597
Construction & Land Development [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	108,096	102,319
Construction & Land Development [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivable, credit quality indicators information	$ 0	$ 0

Credit Quality - Schedule of Im

Credit Quality - Schedule of Impaired Loans Information by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Owner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	$ 43,920		$ 43,920		$ 37,811
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	44,133		44,133		37,811
Impaired Loans, Recorded Investment, With an allowance recorded	4,616		4,616		5,014
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	4,616		4,616		5,014
Impaired Loans, Related Allowance	1,099		1,099		776
Impaired Loans, Recorded Investment	48,536		48,536		42,825
Impaired Loans, Unpaid Principal Balance	48,749		48,749		42,825
Impaired Loans, Related Allowance	1,099		1,099		776
Impaired Loans, Average Recorded Investment, With no related allowance recorded	43,898	$ 37,654	40,294	$ 26,752
Impaired Loans, Interest Income Recognized, With no related allowance recorded	117	425	179	488
Impaired Loans, Average Recorded Investment, With an allowance recorded	4,789	3,695	4,936	3,916
Impaired Loans, Interest Income Recognized, With an allowance recorded	20	34	58	75
Impaired Loans, Average Recorded Investment	48,687	41,349	45,230	30,668
Impaired Loans, Interest Income Recognized	137	459	237	563
Nonowner-Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	71,073		71,073		48,126
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	71,538		71,538		48,462
Impaired Loans, Recorded Investment, With an allowance recorded	6,727		6,727		6,994
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	6,727		6,727		6,994
Impaired Loans, Related Allowance	1,347		1,347		797
Impaired Loans, Recorded Investment	77,800		77,800		55,120
Impaired Loans, Unpaid Principal Balance	78,265		78,265		55,456
Impaired Loans, Related Allowance	1,347		1,347		797
Impaired Loans, Average Recorded Investment, With no related allowance recorded	66,936	63,135	61,290	44,110
Impaired Loans, Interest Income Recognized, With no related allowance recorded	354	154	517	210
Impaired Loans, Average Recorded Investment, With an allowance recorded	6,847	7,794	7,112	8,313
Impaired Loans, Interest Income Recognized, With an allowance recorded	7	46	46	92
Impaired Loans, Average Recorded Investment	73,783	70,929	68,402	52,423
Impaired Loans, Interest Income Recognized	361	200	563	302
Other Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	35,676		35,676		38,521
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	37,389		37,389		40,329
Impaired Loans, Recorded Investment, With an allowance recorded	19,692		19,692		17,554
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	23,193		23,193		20,554
Impaired Loans, Related Allowance	11,887		11,887		7,168
Impaired Loans, Recorded Investment	55,368		55,368		56,075
Impaired Loans, Unpaid Principal Balance	60,582		60,582		60,883
Impaired Loans, Related Allowance	11,887		11,887		7,168
Impaired Loans, Average Recorded Investment, With no related allowance recorded	35,659	31,403	32,580	24,368
Impaired Loans, Interest Income Recognized, With no related allowance recorded	140	147	240	158
Impaired Loans, Average Recorded Investment, With an allowance recorded	19,764	12,234	19,083	12,680
Impaired Loans, Interest Income Recognized, With an allowance recorded	154	82	218	88
Impaired Loans, Average Recorded Investment	55,423	43,637	51,663	37,048
Impaired Loans, Interest Income Recognized	294	229	458	246
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	31,368		31,368		31,262
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	32,133		32,133		31,930
Impaired Loans, Recorded Investment, With an allowance recorded	7,548		7,548		6,028
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	8,869		8,869		7,349
Impaired Loans, Related Allowance	3,577		3,577		2,578
Impaired Loans, Recorded Investment	38,916		38,916		37,290
Impaired Loans, Unpaid Principal Balance	41,002		41,002		39,279
Impaired Loans, Related Allowance	3,577		3,577		2,578
Impaired Loans, Average Recorded Investment, With no related allowance recorded	30,867	30,535	31,912	24,369
Impaired Loans, Interest Income Recognized, With no related allowance recorded	97	96	146	149
Impaired Loans, Average Recorded Investment, With an allowance recorded	7,119	7,880	6,692	7,810
Impaired Loans, Interest Income Recognized, With an allowance recorded	18	29	29	93
Impaired Loans, Average Recorded Investment	37,986	38,415	38,604	32,179
Impaired Loans, Interest Income Recognized	115	125	175	242
Construction & Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	33,500		33,500		64,945
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	37,481		37,481		68,799
Impaired Loans, Recorded Investment, With an allowance recorded	11,686		11,686		10,779
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	15,415		15,415		14,189
Impaired Loans, Related Allowance	3,859		3,859		3,627
Impaired Loans, Recorded Investment	45,186		45,186		75,724
Impaired Loans, Unpaid Principal Balance	52,896		52,896		82,988
Impaired Loans, Related Allowance	3,859		3,859		3,627
Impaired Loans, Average Recorded Investment, With no related allowance recorded	36,722	47,169	45,541	36,118
Impaired Loans, Interest Income Recognized, With no related allowance recorded	80	68	159	137
Impaired Loans, Average Recorded Investment, With an allowance recorded	10,740	10,328	10,833	10,569
Impaired Loans, Interest Income Recognized, With an allowance recorded	58	12	92	16
Impaired Loans, Average Recorded Investment	47,462	57,497	56,374	46,687
Impaired Loans, Interest Income Recognized	138	80	251	153
Bankcard [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	0		0		0
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	0		0		0
Impaired Loans, Recorded Investment, With an allowance recorded	0		0		0
Impaired Loans, Unpaid Principal Balance, With an allowance recorded	0		0		0
Impaired Loans, Related Allowance	0		0		0
Impaired Loans, Recorded Investment	0		0		0
Impaired Loans, Unpaid Principal Balance	0		0		0
Impaired Loans, Related Allowance	0		0		0
Impaired Loans, Average Recorded Investment, With no related allowance recorded	0	0	0	0
Impaired Loans, Interest Income Recognized, With no related allowance recorded	0	0	0	0
Impaired Loans, Average Recorded Investment, With an allowance recorded	0	0	0	0
Impaired Loans, Interest Income Recognized, With an allowance recorded	0	0	0	0
Impaired Loans, Average Recorded Investment	0	0	0	0
Impaired Loans, Interest Income Recognized	0	0	0	0
Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Recorded Investment, With no related allowance recorded	30		30		41
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded	30		30		41
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	30		30		41
Impaired Loans, Unpaid Principal Balance	30		30		41
Impaired Loans, Related Allowance	0		0		$ 0
Impaired Loans, Average Recorded Investment, With no related allowance recorded	35	42	40	28
Impaired Loans, Interest Income Recognized, With no related allowance recorded	0	0	0	0
Impaired Loans, Average Recorded Investment, With an allowance recorded	0	152	0	152
Impaired Loans, Interest Income Recognized, With an allowance recorded	0	0	0	0
Impaired Loans, Average Recorded Investment	35	194	40	180
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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
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	$ 668	$ 274	$ 4,032	$ 346
Reserve for lending-related commitments	$ 1,380		$ 1,380		$ 1,518
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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	$ 75,573		$ 75,529	$ 74,198	$ 74,198
Charge-offs	6,627		12,735		25,241
Recoveries	553		1,351		4,635
Provision	5,716	$ 6,201	11,070	10,880	21,937
Allowance for Loan Losses Ending balance	75,215		75,215		75,529
Allowance for Loan Losses, individually evaluated for impairment	21,769		21,769		14,946
Allowance for Loan Losses, collectively evaluated for impairment	53,446		53,446		60,583
Financing receivables	9,097,301		9,097,301		9,119,492
Financing receivables, individually evaluated for impairment	99,418		99,418		87,450
Financing receivables, collectively evaluated for impairment	8,835,810		8,835,810		8,855,703
Loans Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	0		0		0
Financing receivables	162,073		162,073		176,339
Owner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	4,406		4,041	5,653	5,653
Charge-offs	507		4,128		3,073
Recoveries	18		120		2,372
Provision	330		4,214		(911)
Allowance for Loan Losses Ending balance	4,247		4,247		4,041
Allowance for Loan Losses, individually evaluated for impairment	1,098		1,098		776
Allowance for Loan Losses, collectively evaluated for impairment	3,149		3,149		3,265
Financing receivables	962,615		962,615		1,016,364
Financing receivables, individually evaluated for impairment	13,890		13,890		12,869
Financing receivables, collectively evaluated for impairment	920,376		920,376		971,408
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	28,349		28,349		32,087
Nonowner-Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	7,670		8,167	8,992	8,992
Charge-offs	157		327		2,097
Recoveries	20		38		268
Provision	(237)		(582)		1,004
Allowance for Loan Losses Ending balance	7,296		7,296		8,167
Allowance for Loan Losses, individually evaluated for impairment	1,347		1,347		797
Allowance for Loan Losses, collectively evaluated for impairment	5,949		5,949		7,370
Financing receivables	2,719,910		2,719,910		2,760,189
Financing receivables, individually evaluated for impairment	22,281		22,281		13,733
Financing receivables, collectively evaluated for impairment	2,643,554		2,643,554		2,692,374
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	54,075		54,075		54,082
Other Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	28,587		26,931	20,917	20,917
Charge-offs	3,801		4,052		4,947
Recoveries	85		196		294
Provision	3,605		5,401		10,667
Allowance for Loan Losses Ending balance	28,476		28,476		26,931
Allowance for Loan Losses, individually evaluated for impairment	11,887		11,887		7,168
Allowance for Loan Losses, collectively evaluated for impairment	16,589		16,589		19,763
Financing receivables	1,607,719		1,607,719		1,577,438
Financing receivables, individually evaluated for impairment	28,798		28,798		27,491
Financing receivables, collectively evaluated for impairment	1,554,816		1,554,816		1,523,504
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	24,105		24,105		26,443
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	14,557		13,835	16,694	16,694
Charge-offs	1,509		2,132		5,027
Recoveries	208		271		573
Provision	1,664		2,946		1,595
Allowance for Loan Losses Ending balance	14,920		14,920		13,835
Allowance for Loan Losses, individually evaluated for impairment	3,578		3,578		2,578
Allowance for Loan Losses, collectively evaluated for impairment	11,342		11,342		11,257
Financing receivables	2,248,037		2,248,037		2,263,354
Financing receivables, individually evaluated for impairment	16,994		16,994		16,189
Financing receivables, collectively evaluated for impairment	2,213,383		2,213,383		2,227,605
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	17,660		17,660		19,560
Construction & Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	16,945		19,402	18,953	18,953
Charge-offs	2		771		7,476
Recoveries	62		387		685
Provision	(30)		(2,043)		7,240
Allowance for Loan Losses Ending balance	16,975		16,975		19,402
Allowance for Loan Losses, individually evaluated for impairment	3,859		3,859		3,627
Allowance for Loan Losses, collectively evaluated for impairment	13,116		13,116		15,775
Financing receivables	1,162,742		1,162,742		1,133,251
Financing receivables, individually evaluated for impairment	17,455		17,455		17,168
Financing receivables, collectively evaluated for impairment	1,107,442		1,107,442		1,071,966
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	37,845		37,845		44,117
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	3,251		3,083	2,945	2,945
Charge-offs	651		1,325		2,621
Recoveries	160		339		443
Provision	409		1,072		2,316
Allowance for Loan Losses Ending balance	3,169		3,169		3,083
Allowance for Loan Losses, individually evaluated for impairment	0		0		0
Allowance for Loan Losses, collectively evaluated for impairment	3,169		3,169		3,083
Financing receivables	396,278		396,278		368,896
Financing receivables, individually evaluated for impairment	0		0		0
Financing receivables, collectively evaluated for impairment	396,239		396,239		368,846
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		50
Allowance for Estimated Imprecision [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses Beginning balance	157		70	$ 44	44
Charge-offs	0		0		0
Recoveries	0		0		0
Provision	(25)		62		26
Allowance for Loan Losses Ending balance	132		132		70
Allowance for Loan Losses, individually evaluated for impairment	0		0		0
Allowance for Loan Losses, collectively evaluated for impairment	132		132		70
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

Intangible Assets - Summary of

Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill not subject to amortization	$ 710,252	$ 709,794
Core Deposit Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	60,577	60,577
Accumulated Amortization	(41,027)	(39,317)
Net Carrying Amount	$ 19,550	$ 21,260

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Intangible Liability Disclosure [Abstract]
Amortization expense	$ 855	$ 1,104	$ 1,710	$ 1,913

Intangible Assets - Schedule of

Intangible Assets - Schedule of Anticipated Amortization Expense (Detail) $ in Thousands	Jun. 30, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,015	$ 3,420
2,016	2,981
2,017	2,767
2,018	2,574
2019 and thereafter	$ 9,518

Short-Term Borrowings - Additio

Short-Term Borrowings - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Unused lines of credit	$ 234,000,000
Federal funds purchased	51,425,000	$ 53,840,000
Repurchase agreements	332,403,000
Wholesale REPO	$ 51,603,000
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)	3 Months Ended	6 Months Ended
	Dec. 31, 2014USD ($)	Jun. 30, 2015USD ($)Trust	Dec. 31, 2009USD ($)
Debt Instrument [Line Items]
Unused borrowing amount		$ 2,430,378,000
FHLB advances	$ 830,335,000	$ 704,940,000
FHLB advances, weighted-average interest rate		0.36%
FHLB advances, maximum maturity period		4 years
Overnight funds		$ 0
Number of statutory business trusts | Trust		13
Outstanding balances of debentures	222,636,000	$ 223,071,000
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
Sequoia Trust I [Member]
Debt Instrument [Line Items]
Junior subordinate debenture, issued	$ 2,000,000
Percentage of junior subordinate debenture, issued	10.18%
VCBI Capital Trust IV [Member]
Debt Instrument [Line Items]
Junior subordinate debenture, issued	$ 25,000,000
Percentage of junior subordinate debenture, issued	10.20%
Capital Securities [Member]
Debt Instrument [Line Items]
Number of statutory business trusts | Trust		13

Long-Term Borrowings - Schedule

Long-Term Borrowings - Schedule of Maturities of FHLB Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
2,015	$ 669,012
2,016	627
2,017	301
2,018	0
2019 and thereafter	35,000
Total	$ 704,940	$ 830,335

Commitments and Contingent Li74

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Loan commitments outstanding	$ 2,630,725	$ 2,763,129
Loan commitments expiry period	1 year
Commercial Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	$ 226	216
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	$ 152,762	$ 160,230

Derivative Financial Instrume75

Derivative Financial Instruments - Schedule of Derivative Instruments (Detail) - Jun. 30, 2015 - USD ($)	Total
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Used for Interest Rate Risk Management and Designated as Hedges	$ 36,802,000
Average Pay Rate	3.44%
Fair Value Hedging [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount, Pay Fixed Swap (Hedging Commercial Loans)	$ 36,802,000
Cash Flow Hedging [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount, Pay Fixed Swap (Hedging Commercial Loans)	$ 36,802,000

Derivative Financial Instrume76

Derivative Financial Instruments - Schedule of Fair Value Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivatives designated as hedging instruments	$ 72	$ 90
Derivatives not designated as hedging instruments	3,099	3,704
Total asset derivatives	3,171	3,794
Derivatives designated as hedging instruments	191	432
Derivatives not designated as hedging instruments	3,099	3,704
Total liability derivatives	3,290	4,136
Interest Rate Contracts [Member] | Other Assets [Member]
Derivative [Line Items]
Derivatives designated as hedging instruments	72	90
Derivatives not designated as hedging instruments	3,099	3,704
Interest Rate Contracts [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivatives designated as hedging instruments	191	432
Derivatives not designated as hedging instruments	$ 3,099	$ 3,704

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest Rate Contracts [Member]
Derivative [Line Items]
Derivatives in fair value hedging relationships	$ 96	$ (273)	$ (328)	$ (524)
Interest Income/ (Expense) [Member]
Derivative [Line Items]
Derivatives in fair value hedging relationships	96	(273)	(328)	(524)
Interest Income/ (Expense) [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivatives in fair value hedging relationships	96	(273)	(328)	(524)
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 Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rates utilized, minimum	3.75%	3.75%
Discount rates utilized, maximum	9.75%	9.75%
Amount of decrease in fair value of securities		$ 6,655,000
Nonrecurring fair value adjustments on loans held for sale	$ 0
Fair value measurement of intangible assets	$ 0	$ 0	$ 0
Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Decrease in fair value of securities		18.00%
Increase in discount rates, basis point	200.00%	200.00%

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	$ 5,628	$ 4,276
Total available for sale securities	1,126,809	1,180,386
Derivative financial assets	3,171	3,794
Derivative financial liabilities	3,290	4,136
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	80,591	89,981
State and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	136,936	136,863
Residential Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	520,430	555,685
Residential Mortgage-Backed Securities, Non-agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	10,806	12,018
Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	8,000	8,027
Commercial Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	310,617	317,099
Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	36,641	39,558
Single Issue Trust Preferred Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	12,074	11,744
Other Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	5,086	5,135
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	1,121,181	1,176,110
Available for sale equity securities	5,628	4,276
Total available for sale securities	1,126,809	1,180,386
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	80,591	89,981
Fair Value, Measurements, Recurring [Member] | State and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	136,936	136,863
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	520,430	555,685
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities, Non-agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	10,806	12,018
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	8,000	8,027
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	310,617	317,099
Fair Value, Measurements, Recurring [Member] | Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	36,641	39,558
Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	12,074	11,744
Fair Value, Measurements, Recurring [Member] | Other Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	5,086	5,135
Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	3,671	2,533
Fair Value, Measurements, Recurring [Member] | Equity Mutual Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	759	560
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	1,198	1,183
Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	3,171	3,794
Derivative financial liabilities	3,290	4,136
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	2,767	2,502
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	2,767	2,502
Total available for sale securities	2,767	2,502
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [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] | Fair Value, Measurements, Recurring [Member] | State and Political Subdivisions [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] | Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities, Non-agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [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] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Collateralized Debt Obligations [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] | Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [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] | Fair Value, Measurements, Recurring [Member] | Other Corporate Securities [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] | Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	810	759
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Mutual Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	759	560
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	1,198	1,183
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	0	0
Derivative financial liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	1,087,401	1,138,326
Derivative financial assets	3,171	3,794
Derivative financial liabilities	3,290	4,136
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	1,084,540	1,136,552
Available for sale equity securities	2,861	1,774
Total available for sale securities	1,087,401	1,138,326
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	80,591	89,981
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | State and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	136,936	136,863
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	520,430	555,685
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities, Non-agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	10,806	12,018
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	8,000	8,027
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	310,617	317,099
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Collateralized Debt Obligations [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] | Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	12,074	11,744
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Other Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	5,086	5,135
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	2,861	1,774
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member] | Equity Mutual Funds [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] | Fair Value, Measurements, Recurring [Member] | Other Equity Securities [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] | Fair Value, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	3,171	3,794
Derivative financial liabilities	3,290	4,136
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total available for sale securities	36,641	39,558
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	36,641	39,558
Available for sale equity securities	0	0
Total available for sale securities	36,641	39,558
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | State and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities, Non-agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities, Agency [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	36,641	39,558
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Single Issue Trust Preferred Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Other Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member] | Financial Services Industry [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, Measurements, Recurring [Member] | Equity Mutual Funds [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, Measurements, Recurring [Member] | Other Equity Securities [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, Measurements, Recurring [Member] | Interest Rate Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative financial assets	0	0
Derivative financial liabilities	$ 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, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Balance, beginning of period	$ 39,558	$ 43,449
Included in earnings (or changes in net assets)	(34)	(4,034)
Included in other comprehensive income	(2,883)	12,312
Purchases, issuances, and settlements	0	(12,169)
Transfers in and/or out of Level 3	0	0
Balance, end of period	36,641	39,558
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at reporting date	$ 0	$ 0

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
YTD Losses, Impaired Loans	$ 5,108	$ 7,349
YTD Losses, OREO	506	3,307
Impaired Loans	50,269	46,369
OREO	34,964	38,778
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	5,404	8,518
OREO	34,964	38,778
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Loans	44,865	37,851
OREO	$ 0	$ 0

Fair Value Measurements - Sum82

Fair Value Measurements - Summary of Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 917,101	$ 753,064
Securities available for sale	1,126,809	1,180,386
Securities held to maturity	39,050	39,310
Other securities	92,456	96,344
Loans held for sale	14,856	8,680
Loans	9,082,104	9,104,652
Derivative financial assets	3,171	3,794
Deposits	9,282,426	9,045,485
Derivative financial liabilities	3,290	4,136
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	917,101	753,064
Securities available for sale	1,126,809	1,180,386
Securities held to maturity	39,050	39,310
Other securities	92,456	96,344
Loans held for sale	14,856	8,680
Loans	9,006,889	9,029,123
Derivative financial assets	3,171	3,794
Deposits	9,282,426	9,045,485
Short-term borrowings	383,828	435,652
Long-term borrowings	979,614	1,105,314
Derivative financial liabilities	3,290	4,136
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	917,101	753,064
Securities available for sale	1,126,809	1,180,386
Securities held to maturity	36,700	36,784
Other securities	87,833	91,527
Loans held for sale	14,856	8,680
Loans	8,968,852	9,055,281
Derivative financial assets	3,171	3,794
Deposits	9,272,849	9,044,976
Short-term borrowings	383,828	435,652
Long-term borrowings	954,083	1,081,133
Derivative financial liabilities	3,290	4,136
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	2,767	2,502
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	917,101	753,064
Securities available for sale	1,087,401	1,138,326
Securities held to maturity	34,680	34,764
Other securities	0	0
Loans held for sale	14,856	8,680
Loans	0	0
Derivative financial assets	3,171	3,794
Deposits	9,272,849	9,044,976
Short-term borrowings	383,828	435,652
Long-term borrowings	954,083	1,081,133
Derivative financial liabilities	3,290	4,136
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	36,641	39,558
Securities held to maturity	2,020	2,020
Other securities	87,833	91,527
Loans held for sale	0	0
Loans	8,968,852	9,055,281
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. 16, 2011	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares of stock, option plan, maximum	1,500,000
Aggregate number of shares issued in respect of restricted stock awards	350,000
Options available for award each plan year	1,150,000
Maximum number of shares of restricted stock or shares subject to a restricted stock units award granted				50,000
Maximum number of options and stock appreciation rights				100,000
Percentage of restricted stock and restricted stock units vest				25.00%
Vesting period of awards				1/3 per year
Recognition of compensation expense		$ 757	$ 670	$ 1,388	$ 1,160
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				147,419	334,662
Total intrinsic value of options exercised				$ 1,100	$ 3,757
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted				53,071
Vesting period				4 years
Non-qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted				189,705

Stock Based Compensation - Summ

Stock Based Compensation - Summary of Stock Option Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Outstanding, Beginning balance	1,380,548
Shares, Granted	189,705
Shares, Exercised	(147,419)	(334,662)
Shares, Forfeited or expired	(11,961)
Shares, Outstanding, Ending balance	1,410,873
Shares, Exercisable at June 30, 2015	973,140
Aggregate Intrinsic Value, Outstanding at June 30, 2015	$ 16,128
Aggregate Intrinsic Value, Exercisable at June 30, 2015	$ 12,480
Weighted Average Remaining Contractual Term, Outstanding at June 30, 2015	6 years
Weighted Average Remaining Contractual Term, Exercisable at June 30, 2015	4 years 8 months 12 days
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 27.94
Weighted Average Exercise Price, Granted	36.92
Weighted Average Exercise Price, Exercised	30.37
Weighted Average Exercise Price, Forfeited or expired	32.07
Weighted Average Exercise Price, Outstanding, Ending balance	28.80
Weighted Average Exercise Price, Exercisable	$ 27.41

Stock Based Compensation - Stat

Stock Based Compensation - Status of United's Nonvested Stock Option Awards (Detail) - Jun. 30, 2015 - $ / shares	Total
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Nonvested, Beginning balance	377,264
Shares, Granted	189,705
Shares, Vested	(120,423)
Shares, Forfeited or expired	(8,813)
Shares, Nonvested, Ending balance	437,733
Weighted-Average Grant Date Fair Value Per Share, Nonvested Beginning balance	$ 6.29
Weighted-Average Grant Date Fair Value Per Share, Granted	7.23
Weighted-Average Grant Date Fair Value Per Share, Vested	6.34
Weighted-Average Grant Date Fair Value Per Share, Forfeited or expired	6.53
Weighted-Average Grant Date Fair Value Per Share, Nonvested Ending balance	$ 6.68

Stock Based Compensation - Chan

Stock Based Compensation - Changes to United's Restricted Common Shares (Detail) - 6 months ended Jun. 30, 2015 - Restricted Stock [Member] - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning balance	120,308
Shares, Granted	53,071
Shares, Vested	(38,041)
Shares, Forfeited	(2,468)
Number of Shares, Outstanding, Ending balance	132,870
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Beginning balance	$ 28.29
Weighted-Average Grant Date Fair Value Per Share, Granted	36.92
Weighted-Average Grant Date Fair Value Per Share, Vested	28.31
Weighted-Average Grant Date Fair Value Per Share, Forfeited	30.25
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Ending balance	$ 31.70

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Compensation and Retirement Disclosure [Abstract]
Unrecognized prior service costs, before tax	$ 1
Unrecognized prior service costs, net of tax	1
Unrecognized actuarial losses, before tax	58,576
Unrecognized actuarial losses, net of tax	38,074
Future Amortization of Prior Service Cost, before tax	1
Future Amortization of Prior Service Cost, net of tax	1
Amortization of actuarial losses, before tax, expected for fiscal year ended December 31, 2014	4,900
Amortization of actuarial losses, net of tax, expected for fiscal year ended December 31, 2014	$ 3,185

Employee Benefit Plans - Net Pe

Employee Benefit Plans - Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 748	$ 574	$ 1,488	$ 1,141
Interest cost	1,446	1,346	2,876	2,678
Expected return on plan assets	(2,319)	(2,269)	(4,612)	(4,513)
Amortization of transition asset	0	0	0	0
Recognized net actuarial loss	1,222	486	2,430	967
Amortization of prior service cost	0	0	0	0
Net periodic pension (benefit) cost	$ 1,097	$ 137	$ 2,182	$ 273
Weighted-Average Assumptions:
Discount rate	4.35%	5.20%	4.35%	5.20%
Expected return on assets	7.50%	7.50%	7.50%	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, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Liability of unrecognized tax benefits	$ 4,017
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	$ 728	$ 512

Comprehensive Income - Componen

Comprehensive Income - Components of Total Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 34,809	$ 33,247	$ 69,436	$ 63,371
Available for sale ("AFS") securities:
AFS securities with OTTI charges during the period	0	(421)	(100)	(1,060)
Related income tax effect	0	147	36	371
Income tax rate change	316	0	316	0
Less : OTTI charges recognized in net income	0	421	34	1,060
Related income tax benefit	0	(147)	(12)	(371)
Reclassification of previous noncredit OTTI to credit OTTI	0	421	0	2,106
Related income tax benefit	0	(147)	0	(737)
Net unrealized (losses) gains on AFS securities with OTTI	316	274	274	1,369
AFS securities - all other:
Change in net unrealized gain on AFS securities arising during the period	(10,053)	12,526	(1,582)	24,581
Related income tax effect	3,639	(4,385)	573	(8,604)
Net reclassification adjustment for (gains) losses included in net income	(3)	(1)	(49)	(825)
Related income tax expense (benefit)	1	1	18	289
Total AFS securities - all other	(6,416)	8,141	(1,040)	15,441
Net effect of AFS securities on other comprehensive income	(6,100)	8,415	(766)	16,810
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	4	3	5	4
Related income tax expense	(2)	(2)	(2)	(2)
Net effect of HTM securities on other comprehensive income	2	1	3	2
Pension plan:
Recognized net actuarial loss	1,222	486	2,430	967
Related income tax benefit	(454)	(176)	(894)	(348)
Net effect of change in pension plan asset on other comprehensive income	768	310	1,536	619
Net current-period other comprehensive income, net of tax	(5,330)	8,726	773	17,431
Total Comprehensive Income	$ 29,479	$ 41,973	$ 70,209	$ 80,802

Comprehensive Income - Compon91

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at January 1, 2015			$ (35,764)
Other comprehensive income before reclassification			(732)
Amounts reclassified from accumulated other comprehensive income			1,505
Net current-period other comprehensive income, net of tax	$ (5,330)	$ 8,726	773	$ 17,431
Balance at June 30, 2015	(34,991)		(34,991)
Unrealized Gains/Losses on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at January 1, 2015			1,553
Other comprehensive income before reclassification			(735)
Amounts reclassified from accumulated other comprehensive income			(31)
Net current-period other comprehensive income, net of tax			(766)
Balance at June 30, 2015	787		787
Accretion on the Unrealized Loss for Securities Transferred from AFS to the HTM [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at January 1, 2015			(62)
Other comprehensive income before reclassification			3
Amounts reclassified from accumulated other comprehensive income			0
Net current-period other comprehensive income, net of tax			3
Balance at June 30, 2015	(59)		(59)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at January 1, 2015			(37,255)
Other comprehensive income before reclassification			0
Amounts reclassified from accumulated other comprehensive income			1,536
Net current-period other comprehensive income, net of tax			1,536
Balance at June 30, 2015	$ (35,719)		$ (35,719)

Comprehensive Income - Reclassi

Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Available for sale ("AFS") securities:
Reclassification of previous noncredit OTTI to credit OTTI	$ 0	$ 421	$ 0	$ 2,106
Related income tax effect	(17,145)	(16,375)	(32,449)	(32,235)
Net earnings allocated to common shareholders	34,747	33,189	69,313	63,253
Pension plan:
Related income tax effect	(17,145)	(16,375)	(32,449)	(32,235)
Net earnings allocated to common shareholders	$ 34,747	$ 33,189	69,313	$ 63,253
Reclassification out of Accumulated Other Comprehensive Income [Member]
Available for sale ("AFS") securities:
Net earnings allocated to common shareholders			1,505
Pension plan:
Net earnings allocated to common shareholders			1,505
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			0
Net reclassification adjustment for losses (gains) included in net income			(49)
Total before tax			(49)
Related income tax effect			18
Net earnings allocated to common shareholders			(31)
Pension plan:
Total before tax			(49)
Related income tax effect			18
Net earnings allocated to common shareholders			(31)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Available for sale ("AFS") securities:
Total before tax			2,430
Related income tax effect			(894)
Net earnings allocated to common shareholders			1,536
Pension plan:
Recognized net actuarial loss			2,430
Total before tax			2,430
Related income tax effect			(894)
Net earnings allocated to common shareholders			$ 1,536

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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Distributed earnings allocated to common stock	$ 22,189	$ 22,124	$ 44,356	$ 44,160
Undistributed earnings allocated to common stock	12,558	11,065	24,957	19,093
Net earnings allocated to common shareholders	$ 34,747	$ 33,189	$ 69,313	$ 63,253
Average common shares outstanding	69,305,612	68,956,123	69,256,831	65,713,854
Equivalents from stock options	281,805	197,909	275,008	235,601
Average diluted shares outstanding	69,587,417	69,154,032	69,531,839	65,949,455
Earnings per basic common share	$ 0.50	$ 0.48	$ 1	$ 0.96
Earnings per diluted common share	$ 0.50	$ 0.48	$ 1	$ 0.96

Variable Interest Entities - Ad

Variable Interest Entities - Additional Information (Detail) - Jun. 30, 2015 - Trust	Total
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 - Sc

Variable Interest Entities - Schedule of Trust Preferred Securities Redemption (Detail) - Dec. 31, 2014 - USD ($) $ in Thousands	Total
Sequoia Capital Trust I [Member]
Debt Instrument, Redemption [Line Items]
Interest Rate	10.18%
Redemption Price	103.563%
Principal Amount Outstanding	$ 2,000
Principal Amount to be Redeemed	$ 2,000
Redemption Date	Dec. 8, 2014
VCBI Capital Trust IV [Member]
Debt Instrument, Redemption [Line Items]
Interest Rate	10.20%
Redemption Price	100.00%
Principal Amount Outstanding	$ 25,000
Principal Amount to be Redeemed	$ 25,000
Redemption Date	Dec. 30, 2014

Variable Interest Entities - In

Variable Interest Entities - Information Related to Statutory Trusts (Detail) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
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, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Aggregate Assets	$ 240,411	$ 241,147
Aggregate Liabilities	232,483	233,222
Risk Of Loss	$ 7,928	$ 7,925