United Community Banks (UCB) 10-K 27 Feb 20 2019 FY Annual report Financial data

Cover Page

Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-35095
Entity Registrant Name	UNITED COMMUNITY BANKS, INC.
Entity Central Index Key	0000857855
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Incorporation, State or Country Code	GA
Entity Tax Identification Number	58-1807304
Entity Address, Address Line One	125 Highway 515 East
Entity Address, City or Town	Blairsville
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30512
City Area Code	706
Local Phone Number	781-2265
Title of 12(b) Security	Common stock, par value $1 per share
Trading Symbol	UCBI
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,247,034,684
Entity Common Stock, Shares Outstanding		78,942,146
Documents Incorporated by Reference	Portions of the registrant’s Proxy Statement for the 2020 Annual Meeting of Shareholders to be held on May 16, 2020 (the “2020 Proxy Statement”) are incorporated herein into Part III by reference.

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest revenue:
Loans, including fees	$ 476,039	$ 420,383	$ 315,050
Investment securities:
Taxable	69,920	73,496	70,172
Tax exempt	4,564	4,189	2,216
Deposits in banks and short-term investments	2,183	2,012	2,282
Total interest revenue	552,706	500,080	389,720
Interest expense:
Deposits	66,856	39,543	17,062
Short-term borrowings	838	1,112	352
Federal Home Loan Bank advances	2,697	6,345	6,095
Long-term debt	12,921	14,330	10,226
Total interest expense	83,312	61,330	33,735
Net interest revenue	469,394	438,750	355,985
Provision for credit losses	13,150	9,500	3,800
Net interest revenue after provision for credit losses	456,244	429,250	352,185
Noninterest income:
Brokerage fees	6,150	5,191	4,633
Gains from other loan sales, net	6,867	9,277	10,493
Securities (losses) gains, net	(1,021)	(656)	42
Other	28,775	24,142	16,477
Total noninterest income	104,713	92,961	88,260
Total revenue	560,957	522,211	440,445
Noninterest expenses:
Salaries and employee benefits	196,440	181,015	153,098
Occupancy	23,350	22,781	20,344
Communications and equipment	24,613	21,277	19,660
FDIC assessments and other regulatory charges	4,901	8,491	6,534
Professional fees	17,028	15,540	12,074
Lending and loan servicing expense	9,416	8,697	7,512
Outside services - electronic banking	7,020	6,623	6,487
Postage, printing and supplies	6,370	6,416	5,952
Advertising and public relations	6,170	5,991	4,242
Amortization of intangibles	4,938	6,846	4,845
Merger-related and other charges	6,907	5,414	13,901
Other	15,092	17,194	12,962
Total noninterest expenses	322,245	306,285	267,611
Income before income taxes	238,712	215,926	172,834
Income tax expense	52,991	49,815	105,013
Net income	185,721	166,111	67,821
Net income available to common shareholders	$ 184,346	$ 164,927	$ 67,250
Income per common share:
Basic (in dollars per share)	$ 2.31	$ 2.07	$ 0.92
Diluted (in dollars per share)	$ 2.31	$ 2.07	$ 0.92
Weighted average common shares outstanding:
Basic (in shares)	79,700	79,662	73,247
Diluted (in shares)	79,708	79,671	73,259
Service charges and fees
Noninterest income:
Service charges and other related fees	$ 36,797	$ 35,997	$ 38,295
Mortgage loan gains and related fees
Noninterest income:
Service charges and other related fees	$ 27,145	$ 19,010	$ 18,320

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income, Before-tax Amount	$ 238,712	$ 215,926	$ 172,834
Net income, Tax (Expense) Benefit	(52,991)	(49,815)	(105,013)
Net income, Net of Tax Amount	185,721	166,111	67,821
Unrealized gains (losses) on available-for- sale securities:
Unrealized holding gains (losses) arising during period, Before-tax Amount	64,749	(24,990)	8
Unrealized holding gains (losses) arising during period, Tax (Expense) Benefit	(15,696)	6,081	75
Unrealized holding gains (losses) arising during period, Net of Tax Amount	49,053	(18,909)	83
Reclassification adjustment for losses (gains) included in net income, Before-tax Amount	1,021	656	(42)
Reclassification adjustment for losses (gains) included in net income, Tax (Expense) Benefit	(247)	(132)	14
Reclassification adjustment for losses (gains) included in net income, Net of Tax Amount	774	524	(28)
Net unrealized gains (losses), Before-tax Amount	65,770	(24,334)	(34)
Net unrealized gains (losses), Tax (Expense) Benefit	(15,943)	5,949	89
Net unrealized gains (losses), Net of Tax Amount	49,827	(18,385)	55
Amortization of losses included in net income on available-for-sale securities transferred to held to maturity, Before-tax Amount	383	739	1,069
Amortization of losses included in net income on available-for-sale securities transferred to held to maturity, Tax (Expense) Benefit	(92)	(180)	(401)
Amortization of losses included in net income on available-for-sale securities transferred to held to maturity, Net of Tax Amount	291	559	668
Amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges, Before-tax Amount	337	499	891
Amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges, Tax (Expense) Benefit	(86)	(129)	(346)
Amortization of losses included in net income on terminated derivative financial instruments that were previously accounted for as cash flow hedges, Net of Tax Amount	251	370	545
Reclassification of disproportionate tax effect related to terminated and current cash flow hedges, Before-tax Amount	0	0	0
Reclassification of disproportionate tax effect related to terminated and current cash flow hedges, Tax (Expense) Benefit	0	0	3,289
Reclassification of disproportionate tax effect related to terminated and current cash flow hedges, Net of Tax Amount	0	0	3,289
Net cash flow hedge activity, Before-tax Amount	337	499	891
Net cash flow hedge activity, Tax (Expense) Benefit	(86)	(129)	2,943
Net cash flow hedge activity, Net of Tax Amount	251	370	3,834
Termination of defined benefit pension plan, Before-tax Amount	1,558	0	0
Termination of defined benefit pension plan, Tax (Expense) Benefit	(398)	0	0
Termination of defined benefit pension plan, Net of Tax Amount	1,160	0	0
Amendments to defined benefit pension plan, Before-tax Amount	(386)	(413)	(700)
Amendments to defined benefit pension plan, Tax (Expense) Benefit	99	105	180
Amendments to defined benefit pension plan, Net of Tax Amount	(287)	(308)	(520)
Net actuarial gain (loss) on defined benefit pension plans, Before-tax Amount	(2,390)	1,015	(1,819)
Net actuarial gain (loss) on defined benefit pension plans, Tax (Expense) Benefit	610	(259)	563
Net actuarial gain (loss) on defined benefit pension plans, Net of Tax Amount	(1,780)	756	(1,256)
Amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plans, Before-tax Amount	699	907	798
Amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plans, Tax (Expense) Benefit	(178)	(247)	(310)
Amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plans, Net of Tax Amount	521	660	488
Net defined benefit pension plan activity, Before-tax Amount	(519)	1,509	(1,721)
Net defined benefit pension plan activity, Tax (Expense) Benefit	133	(401)	433
Net defined benefit pension plan activity, Net of Tax Amount	(386)	1,108	(1,288)
Total other comprehensive (loss) income, Before-tax Amount	65,971	(21,587)	205
Total other comprehensive (loss) income, Tax (Expense) Benefit	(15,988)	5,239	3,064
Total other comprehensive (loss) income, Net of Tax Amount	49,983	(16,348)	3,269
Comprehensive income, Before-tax Amount	304,683	194,339	173,039
Comprehensive income, Tax (Expense) Benefit	(68,979)	(44,576)	(101,949)
Comprehensive income, Net of Tax Amount	$ 235,704	$ 149,763	$ 71,090

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks	$ 125,844	$ 126,083
Interest-bearing deposits in banks	389,362	201,182
Cash and cash equivalents	515,206	327,265
Debt securities available-for-sale	2,274,581	2,628,467
Debt securities held-to-maturity (fair value $287,904 and $268,803)	283,533	274,407
Loans held for sale, at fair value	58,484	18,935
Loans, net of unearned income	8,812,553	8,383,401
Less allowance for loan losses	(62,089)	(61,203)
Loans, net	8,750,464	8,322,198
Premises and equipment, net	215,976	206,140
Bank owned life insurance	202,664	192,616
Accrued interest receivable	32,660	35,413
Net deferred tax asset	34,059	64,224
Derivative financial instruments	35,007	24,705
Goodwill and other intangible assets, net	342,247	324,072
Other assets	171,135	154,750
Total assets	12,916,016	12,573,192
Deposits:
Noninterest-bearing demand	3,477,979	3,210,220
Interest-bearing deposits	7,419,265	7,324,293
Total deposits	10,897,244	10,534,513
Federal Home Loan Bank advances	0	160,000
Long-term debt	212,664	267,189
Derivative financial instruments	15,516	26,433
Accrued expenses and other liabilities	154,900	127,503
Total liabilities	11,280,324	11,115,638
Commitments and contingencies
Shareholders' equity:
Common stock, $1 par value; 150,000,000 shares authorized; 79,013,729 and 79,234,077 shares issued and outstanding	79,014	79,234
Common stock issuable; 664,640 and 674,499 shares	11,491	10,744
Capital surplus	1,496,641	1,499,584
Retained earnings (accumulated deficit)	40,152	(90,419)
Accumulated other comprehensive income (loss)	8,394	(41,589)
Total shareholders’ equity	1,635,692	1,457,554
Total liabilities and shareholders’ equity	$ 12,916,016	$ 12,573,192

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Debt securities held-to-maturity, fair value	$ 287,904	$ 268,803
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, authorized (in shares)	150,000,000	150,000,000
Common stock, issued (in shares)	79,013,729	79,234,077
Common stock, outstanding (in shares)	79,013,729	79,234,077
Common stock issuable (in shares)	664,640	674,499

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Common Stock Issuable	Capital Surplus	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive (Loss) Income
Beginning balance at Dec. 31, 2016	$ 1,075,735	$ 70,899	$ 7,327	$ 1,275,849	$ (251,857)	$ (26,483)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	67,821				67,821
Other comprehensive income (loss)	3,269					3,269
Common stock issued to Dividend Reinvestment Plan and employee benefit plans (83,557 common shares in 2019, 25,248 common shares in 2018, 17,826 common shares in 2017)	450	18		432
Common stock issued for acquisitions (1,443,987 common shares in 2018, 6,515,505 common shares in 2017)	179,465	6,516		172,949
Amortization of stock options and restricted stock unit awards	5,827			5,827
Vesting of restricted stock unit awards, net of shares withheld to cover payroll taxes (109,100 common shares issued and 55,271 common shares deferred in 2019, 125,067 common shares issued and 99,779 common shares deferred in 2018, 114,837 common shares issued and 111,090 common shares deferred in 2017)	(1,594)	115	1,763	(3,472)
Deferred compensation plan, net, including dividend equivalents	361		361
Shares issued from deferred compensation plan (74,490 shares in 2019, 48,214 shares in 2018, 32,279 shares in 2017)	(107)	32	(368)	229
Common stock dividends ($0.68 per share in 2019, $0.58 per share in 2018, $0.38 per share in 2017)	(28,330)				(28,330)
Reclassification of disproportionate tax effects resulting from the Tax Cuts and Jobs Act of 2017 pursuant to ASU 2018-02	0				2,027	(2,027)
Ending balance at Dec. 31, 2017	1,303,334	77,580	9,083	1,451,814	(209,902)	(25,241)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	166,111				166,111
Other comprehensive income (loss)	(16,348)					(16,348)
Common stock issued to Dividend Reinvestment Plan and employee benefit plans (83,557 common shares in 2019, 25,248 common shares in 2018, 17,826 common shares in 2017)	679	25		654
Common stock issued for acquisitions (1,443,987 common shares in 2018, 6,515,505 common shares in 2017)	45,746	1,444		44,302
Amortization of stock options and restricted stock unit awards	6,057			6,057
Exercise of stock options (13,000 shares in 2019, 12,000 shares in 2018)	142	12		130
Vesting of restricted stock unit awards, net of shares withheld to cover payroll taxes (109,100 common shares issued and 55,271 common shares deferred in 2019, 125,067 common shares issued and 99,779 common shares deferred in 2018, 114,837 common shares issued and 111,090 common shares deferred in 2017)	(1,988)	125	1,931	(4,044)
Deferred compensation plan, net, including dividend equivalents	459		459
Shares issued from deferred compensation plan (74,490 shares in 2019, 48,214 shares in 2018, 32,279 shares in 2017)	(10)	48	(729)	671
Common stock dividends ($0.68 per share in 2019, $0.58 per share in 2018, $0.38 per share in 2017)	(46,628)				(46,628)
Ending balance at Dec. 31, 2018	1,457,554	79,234	10,744	1,499,584	(90,419)	(41,589)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	185,721				185,721
Other comprehensive income (loss)	49,983					49,983
Common stock issued to Dividend Reinvestment Plan and employee benefit plans (83,557 common shares in 2019, 25,248 common shares in 2018, 17,826 common shares in 2017)	2,193	83		2,110
Amortization of stock options and restricted stock unit awards	9,360			9,360
Exercise of stock options (13,000 shares in 2019, 12,000 shares in 2018)	212	13		199
Vesting of restricted stock unit awards, net of shares withheld to cover payroll taxes (109,100 common shares issued and 55,271 common shares deferred in 2019, 125,067 common shares issued and 99,779 common shares deferred in 2018, 114,837 common shares issued and 111,090 common shares deferred in 2017)	(1,442)	109	1,476	(3,027)
Deferred compensation plan, net, including dividend equivalents	525		525
Shares issued from deferred compensation plan (74,490 shares in 2019, 48,214 shares in 2018, 32,279 shares in 2017)	(244)	75	(1,254)	935
Common stock dividends ($0.68 per share in 2019, $0.58 per share in 2018, $0.38 per share in 2017)	(54,601)				(54,601)
Purchases of common stock (500,495 shares)	(13,020)	(500)		(12,520)
Ending balance at Dec. 31, 2019	$ 1,635,692	$ 79,014	$ 11,491	$ 1,496,641	$ 40,152	$ 8,394

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Common stock issued to Dividend Reinvestment Plan and employee benefit plans (in shares)	83,557	25,248	17,826
Common stock issued for acquisitions (in shares)		1,443,987	6,515,505
Exercise of stock options (in shares)	13,000	12,000
Vesting of restricted stock unit awards, net of shares withheld to cover payroll taxes, issued (in shares)	109,100	125,067	114,837
Vesting of restricted stock unit awards, net of shares withheld to cover payroll taxes, deferred (in shares)	55,271	99,779	111,090
Shares issued from deferred compensation plan (in shares)	74,490	48,214	32,279
Common stock dividends (in dollars per share)	$ 0.68	$ 0.58	$ 0.38
Purchases of common stock (in shares)	500,495	0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net income	$ 185,721	$ 166,111	$ 67,821
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	23,952	30,971	27,494
Provision for credit losses	13,150	9,500	3,800
Stock based compensation	9,360	6,057	5,827
Deferred income tax expense	14,909	32,630	99,562
Securities losses (gains), net	1,021	656	(42)
Gains from other loan sales, net	(6,867)	(9,277)	(10,493)
Changes in assets and liabilities:
(Increase) decrease in other assets and accrued interest receivable	(45,789)	13,195	(15,525)
(Decrease) increase in accrued expenses and other liabilities	(1,975)	3,772	24,280
(Increase) decrease in loans held for sale	(39,549)	16,391	5,238
Net cash provided by operating activities	153,933	270,006	207,962
Debt securities held-to-maturity:
Proceeds from maturities and calls	50,379	58,605	56,917
Purchases	(59,629)	(11,983)	(36,638)
Debt securities available-for-sale and equity securities with readily determinable fair values:
Proceeds from sales	352,106	168,891	340,540
Proceeds from maturities and calls	349,758	346,505	605,889
Payments to Acquire Debt Securities, Available-for-sale	294,245	566,333	936,947
Net increase in loans	(205,612)	(291,890)	(109,433)
Net cash (paid) received for acquisitions	(19,545)	(56,800)	53,678
Purchase of bank owned life insurance	0	0	(10,000)
Purchases of premises and equipment	(20,944)	(17,617)	(22,183)
Proceeds from sales of premises and equipment	6,595	6,483	3,137
Proceeds from sale of other real estate owned	2,439	4,664	9,534
Other investing activities	1,916	0	0
Net cash provided by (used in) investing activities	163,218	(359,475)	(45,506)
Financing activities:
Net increase in deposits	151,401	727,839	287,073
Net (decrease) increase in short-term borrowings		(264,923)
Net (decrease) increase in short-term borrowings	0		43,859
Proceeds from Federal Home Loan Bank advances	1,625,000	2,860,000	4,000,000
Repayment of Federal Home Loan Bank advances	(1,785,000)	(3,204,003)	(4,294,000)
Repayment of long-term debt	(55,266)	(71,831)	(75,000)
Proceeds from issuance of long-term debt, net of issuance costs	0	98,188	0
Proceeds from issuance of common stock for dividend reinvestment and employee benefit plans	2,193	679	450
Proceeds from exercise of stock options	212	142	0
Cash paid for shares withheld to cover payroll taxes upon vesting of restricted stock units	(1,686)	(1,998)	(1,701)
Repurchase of common stock	(13,020)	0	0
Cash dividends on common stock	(53,044)	(41,634)	(26,210)
Net cash (used in) provided by financing activities	(129,210)	102,459	(65,529)
Net change in cash and cash equivalents, including restricted cash	187,941	12,990	96,927
Cash and cash equivalents, including restricted cash, at beginning of year	327,265	314,275	217,348
Cash and cash equivalents, including restricted cash, at end of year	515,206	327,265	314,275
Cash paid during the period for:
Interest	85,973	56,830	34,657
Income taxes paid	$ 33,776	$ 7,880	$ 6,514

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The accounting principles followed by United Community Banks, Inc. and its subsidiaries (collectively referred to herein as “United”) and the methods of applying these principles conform with accounting principles generally accepted in the United States of America (“GAAP”) and with general practices within the banking industry. The following is a description of the significant policies. Organization and Basis of Presentation United Community Banks, Inc. (the “Holding Company”) is a bank holding company subject to the regulation of the Board of Governors of the Federal Reserve System (the “Federal Reserve”) whose principal business is conducted by its wholly-owned commercial bank subsidiary, United Community Bank (the “Bank”). United is subject to regulation under the Bank Holding Company Act of 1956. The consolidated financial statements include the accounts of the Holding Company, the Bank and other wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The Bank is a Georgia state chartered commercial bank that serves both rural and metropolitan markets in Georgia, South Carolina, North Carolina and Tennessee and provides a full range of banking services. The Bank is insured and subject to the regulation of the Federal Deposit Insurance Corporation (“FDIC”) and is also subject to the regulation of the Georgia Department of Banking and Finance. Use of Estimates In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the dates of the balance sheet and revenue and expenses for the years then ended. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant change are the determination of the allowance for loan losses, the valuation of acquired loans, the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans, the valuation of goodwill and separately identifiable intangible assets associated with mergers and acquisitions, and the valuation of deferred tax assets. Operating Segments Operating segments are components of a business about which separate financial information is available and evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assessing performance. Public companies are required to report certain financial information about operating segments in interim and annual financial statements. United’s community banking operations are divided among geographic regions and local community banks within those regions. Those regions and banks have similar economic characteristics and are therefore considered to be one operating segment. Additionally, management assessed other operating units to determine if they should be classified and reported as segments, including Mortgage, Advisory Services and Commercial Banking Solutions. Qualitatively, these business units are currently operating in the same geographic footprint as the community banks and face many of the same customers as the community banks. While the chief operating decision maker does have some limited production information for these entities, that information is not complete since it does not include a full allocation of revenue, costs and capital from key corporate functions. The business units are currently viewed more as a product line extension of the community banks. However, management will continue to evaluate these business units for separate reporting as facts and circumstances change. Based on this analysis, United concluded that it has one operating and reportable segment. Accounting for Variable Interest Entities The consolidated financial statements also include the results of a bankruptcy-remote securitization entity, Navitas Equipment Receivables LLC 2016-1 (“NER 16-1”), acquired with NLFC Holdings Corp. (“Navitas”). NER 16-1 was formed solely to receive loans transferred from Navitas to be used as collateral for a term note securitization. Navitas is the primary beneficiary of NER 16-1. As a result, while the transfer of the loans meets the criteria of a sale, NER 16-1 is consolidated on United’s books and therefore the transfer is accounted for as a secured borrowing. NER 16-1 differs from other entities included in United’s consolidated statements because the assets it holds are legally isolated. At December 31, 2018, NER 16-1 had total assets of $65.5 million and total liabilities of $55.3 million . During 2019, NER 16-1 executed a payoff and termination of the remaining notes outstanding in accordance with the terms of the related securitization documents. Cash and Cash Equivalents Cash equivalents include amounts due from banks, interest-bearing deposits in banks, federal funds sold, commercial paper, reverse repurchase agreements and short-term investments and are carried at cost. Federal funds are generally sold for one-day periods, interest-bearing deposits in banks are available on demand and commercial paper investments and reverse repurchase agreements mature within a period of less than 90 days. A portion of the cash on hand and on deposit with the Federal Reserve Bank of Atlanta was required to meet regulatory reserve requirements. The terms of securitizations acquired with Navitas require various restricted cash accounts. These cash accounts were funded from either a portion of the proceeds from the issuance of notes or from the collections on leases and loans that were conveyed in the securitization. These restricted cash accounts provide additional collateral to the note holders under specific provisions of the securitizations which govern when funds in these accounts may be released as well as conditions under which collections on contracts transferred to the securitizations may be used to fund deposits into the restricted cash accounts. At December 31, 2018, these restricted cash accounts totaled $6.70 million and were included in interest-bearing deposits in banks on the consolidated balance sheet. There were no restricted cash accounts related to securitizations at December 31, 2019. Investment Securities United classifies its debt securities in one of three categories: trading, held-to-maturity or available-for-sale. United does not currently hold any trading securities that are bought and held principally for the purpose of selling them in the near term. Held-to-maturity securities are those securities for which United has the ability and intent to hold until maturity. All other securities are classified as available-for-sale. Held-to-maturity securities are recorded at cost, adjusted for the amortization or accretion of premiums or discounts. Available-for-sale securities are recorded at fair value. Unrealized holding gains and losses, net of the related tax effect, on available-for-sale securities are reported in other comprehensive income as a separate component of shareholders’ equity until realized. Transfers of securities between categories are recorded at fair value at the date of transfer. Unrealized holding gains or losses associated with transfers of securities from available-for-sale to held-to-maturity are included in the balance of accumulated other comprehensive income in the consolidated balance sheets. These unrealized holding gains or losses are amortized into income over the remaining life of the security as an adjustment to the yield in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security. Management evaluates investment securities for other than temporary impairment on a quarterly basis. A decline in the fair value of available-for-sale and held-to-maturity securities below cost that is deemed other than temporary is charged to earnings for a decline in value deemed to be credit related. The decline in value attributed to non-credit related factors is recognized in other comprehensive income and a new cost basis for the security is established. Premiums and discounts are amortized or accreted over the life of the related security as an adjustment to the yield. Realized gains and losses for securities classified as available-for-sale and held-to-maturity are included in net income and derived using the specific identification method for determining the cost of the securities sold. Equity securities are included in other assets on the consolidated balance sheets. Those with readily determinable fair values are carried at fair value with changes in fair value recognized in net income. Those without readily determinable fair values include, among others, Federal Home Loan Bank (“FHLB”) stock held to meet FHLB requirements related to outstanding advances and Community Reinvestment Act (“CRA”) equity investments, including those where the returns are primarily derived from low income housing tax credits (“LIHTC”). Our investment in FHLB stock, which totaled $11.5 million at December 31, 2019 , is accounted for using the cost method of accounting. Our LIHTC investments are accounted for using the proportional amortization method of accounting for qualified affordable housing investments which results in the amortization being reported as a component of income tax expense. Our obligations related to unfunded commitments for our LIHTC investments are reported in other liabilities. Our other CRA investments are accounted for using the equity method of accounting. As conditions warrant, we review our investments for impairment and will adjust the carrying value of the investment if it is deemed to be impaired. Loans Held for Sale United has elected the fair value option for most of its newly originated mortgage loans held for sale in order to reduce certain timing differences and match changes in fair values of the loans with changes in the fair value of derivative instruments used to economically hedge them. Loans and Leases With the exception of purchased loans that are recorded at fair value on the date of acquisition, loans are stated at principal amount outstanding, net of any unearned revenue and net of any deferred loan fees and costs. Interest on loans is primarily calculated by using the simple interest method on daily balances of the principal amount outstanding. Equipment Financing Lease Receivables: Equipment financing lease receivables, which are classified as sales-type or direct financing leases, are recorded as the sum of the future minimum lease payments, initial deferred costs and estimated or contractual residual values less unearned income and security deposits. The determination of residual value is derived from a variety of sources including equipment valuation services, appraisals, and publicly available market data on recent sales transactions on similar equipment. The length of time until contract termination, the cyclical nature of equipment values and the limited marketplace for re-sale of certain leased assets are important variables considered in making this determination. Interest income, which is included in loan interest revenue in the consolidated statements of income, is recognized as earned using the effective interest method. Direct fees and costs associated with the origination of leases are deferred and included as a component of equipment financing receivables. Net deferred fees or costs are recognized as an adjustment to interest income over the contractual life of the lease using the effective interest method. These lease agreements may include options to renew and for the lessee to purchase the leased equipment at the end of the lease term. United excludes sales taxes from consideration in these lease contracts. Purchased Loans With Evidence of Credit Deterioration: United from time to time purchases loans, primarily through business combination transactions. Some of those purchased loans show evidence of credit deterioration since origination and are accounted for pursuant to Accounting Standards Codification (“ASC”) Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality . These purchased credit impaired (“PCI”) loans are recorded at their estimated fair value at date of purchase. After acquisition, further losses evidenced by decreases in expected cash flows are recognized by an increase in the allowance for loan losses. PCI loans are aggregated into pools of loans based on common risk characteristics such as the type of loan, payment status, or collateral type. United estimates the amount and timing of expected cash flows for each purchased loan pool and the expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the pool (accretable yield). The excess of the pool’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). Over the life of the loan pool, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded. If the present value of expected cash flows is greater than the carrying amount, it is recognized as part of future interest revenue. Nonaccrual Loans: The accrual of interest is discontinued when a loan becomes 90 days past due and is not well collateralized and in the process of collection, or when management believes, after considering economic and business conditions and collection efforts, that the principal or interest will not be collectible in the normal course of business. Past due status is based on contractual terms of the loan. When a loan is placed on nonaccrual status, previously accrued and uncollected interest is charged against interest revenue on loans. Interest payments are applied to reduce the principal balance on nonaccrual loans. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current, there is a sustained period of repayment performance and future payments are reasonably assured. Nonaccrual loans include smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. Contractually delinquent PCI loans are not classified as nonaccrual as long as the related discount continues to be accreted. Impaired Loans: With the exception of PCI loans, a loan is considered impaired when, based on current events and circumstances, it is probable that all amounts due, according to the contractual terms of the loan, will not be collected. Individually impaired loans are measured based on the present value of expected future cash flows, discounted at the loan’s effective interest rate, at the loan’s observable market price, or the fair value of the collateral if the loan is collateral dependent. Interest revenue on impaired loans is discontinued when the loans meet the criteria for nonaccrual status. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not considered impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. PCI loans are considered to be impaired when it is probable that United will be unable to collect all the cash flows expected at acquisition, plus additional cash flows expected to be collected arising from changes in estimates after acquisition. Loans that are accounted for in pools are evaluated collectively for impairment on a pool by pool basis based on expected pool cash flows. Discounts continue to be accreted as long as there are expected future cash flows in excess of the current carrying amount of the specifically-reviewed loan or pool. Concentration of Credit Risk: Most of United’s business activity is with customers located within the markets where it has banking operations. Therefore, United’s exposure to credit risk is significantly affected by changes in the economy within its markets. Approximately 76% of United’s loan portfolio is secured by real estate and is therefore susceptible to changes in real estate valuations. Allowance for Credit Losses The allowance for credit losses includes the allowance for loan losses and the allowance for unfunded commitments included in other liabilities. Increases to the allowance for loan losses and allowance for unfunded commitments are established through a provision for credit losses charged to income. Loans are charged down against the allowance for loan losses when available information confirms that the collectability of the principal is unlikely. The allowance for loan losses represents an amount, which, in management’s judgment, is adequate to absorb probable losses on existing loans as of the date of the balance sheet. The allowance for unfunded commitments represents expected losses on unfunded commitments and is reported in the consolidated balance sheets in other liabilities. The allowance for loan losses is composed of general reserves, specific reserves, and PCI reserves. General reserves are determined by applying loss percentages to the individual loan categories that are based on actual historical loss experience. Additionally, the general economic and business conditions affecting key lending areas, credit quality trends, collateral values, loan volumes and concentrations, seasoning of the loan portfolio, the findings of internal and external credit reviews and results from external bank regulatory examinations are considered in this evaluation. The need for specific reserves is evaluated on nonaccrual loan relationships greater than $500,000 and all troubled debt restructurings (“TDRs”). The specific reserves are determined on a loan-by-loan basis based on management’s evaluation of United’s exposure for each credit, given the current payment status of the loan and the value of any underlying collateral. Loans for which specific reserves are provided are excluded from the calculation of general reserves. For PCI loans, a valuation allowance is established when it is probable that the Company will be unable to collect all the cash flows expected at acquisition plus additional cash flows expected to be collected arising from changes in estimate after acquisition. The allocation of the allowance for loan losses is based on historical data, subjective judgment and estimates and, therefore, is not necessarily indicative of the specific amounts or loan categories in which charge-offs may ultimately occur. For purposes of determining general reserves, United segments the loan portfolio into broad categories with similar risk elements. Those categories and their specific risks are described below. Owner occupied commercial real estate – Loans in this category are susceptible to business failure and general economic conditions. Income producing commercial real estate – Common risks for this loan category are declines in general economic conditions, declines in real estate value, declines in occupancy rates, and lack of suitable alternative use for the property. Commercial & industrial – Risks to this loan category include customer or industry concentrations and the inability to monitor the condition of the collateral which often consists of inventory, accounts receivable and other non-real estate assets. Equipment and inventory obsolescence can also pose a risk. Declines in general economic conditions and other events can cause cash flows to fall to levels insufficient to service debt. Commercial construction – Risks common to commercial construction loans are cost overruns, changes in market demand for property, inadequate long-term financing arrangements and declines in real estate values. Equipment financing - Risks associated with equipment financing are similar to those described for commercial and industrial loans, including general economic conditions, as well as appropriate lien priority on equipment, equipment obsolescence and the general mobility of the collateral. Residential mortgage – Residential mortgage loans are susceptible to weakening general economic conditions and increases in unemployment rates and declining real estate values. Home equity lines of credit – Risks common to home equity lines of credit are general economic conditions, including an increase in unemployment rates, and declining real estate values which reduce or eliminate the borrower’s home equity. Residential construction – Residential construction loans are susceptible to the same risks as residential mortgage loans. Changes in market demand for property leads to longer marketing times resulting in higher carrying costs, declining values, and higher interest rates. Consumer direct – Risks common to consumer direct loans include regulatory risks, unemployment and changes in local economic conditions as well as the inability to monitor collateral consisting of personal property. Indirect auto - Risks common to indirect auto loans include unemployment and changes in local economic conditions as well as the inability to monitor collateral. During 2019, United sold its portfolio of indirect auto loans. Management outsources a significant portion of its loan review to ensure objectivity in the loan review process and to challenge and corroborate the loan grading system. The loan review function provides additional analysis used in determining the adequacy of the allowance for loan losses. To supplement the outsourced loan review, management also has an internal loan review department that is independent of the lending function. Management believes the allowance for loan losses is appropriate at December 31, 2019 . While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review United’s allowance for loan losses. Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed primarily using the straight line method over the estimated useful lives of the related assets. Costs incurred for maintenance and repairs are expensed as incurred. The range of estimated useful lives for buildings and improvements is 10 to 40 years , for land improvements, 10 years , and for furniture and equipment, 3 to 10 years . United periodically reviews the carrying value of premises and equipment for impairment whenever events or circumstances indicate that the carrying amount of such assets may not be fully recoverable. Foreclosed Properties (Other Real Estate Owned, or “OREO”) Foreclosed property is initially recorded at fair value, less cost to sell. If the fair value, less cost to sell at the time of foreclosure is less than the loan balance, the deficiency is recorded as a loan charge-off against the allowance for loan losses. If the fair value, less cost to sell, of the foreclosed property decreases during the holding period, a valuation allowance is established with a charge to operating expenses. When the foreclosed property is sold, a gain or loss is recognized on the sale for the difference between the sales proceeds and the carrying amount of the property. Goodwill and Other Intangible Assets Goodwill is an asset representing the future economic benefits from other assets acquired that are not individually identified and separately recognized. Goodwill is measured as the excess of the consideration transferred, net of the fair value of identifiable assets acquired and liabilities assumed at the acquisition date. Goodwill is not amortized, but instead is tested for impairment annually or more frequently if events or circumstances exist that indicate a goodwill impairment test should be performed. Other intangible assets, which are initially recorded at fair value, consist of core deposit intangible assets and noncompete agreements resulting from acquisitions. Core deposit intangible assets are amortized on a sum-of-the-years-digits basis over their estimated useful lives. Noncompete agreements, which were fully amortized at December 31, 2019, were amortized on a straight line basis over their estimated useful lives. Management evaluates other intangible assets for impairment whenever events or changes in circumstances indicate the carrying amount of the asset may not be recoverable. Transfers of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from United, the transferee obtains the right, free of conditions that constrain it from taking advantage of that right, to pledge or exchange the transferred assets and United does not maintain effective control over the transferred assets through an agreement to repurchase them before maturity. Servicing Rights United records a separate servicing asset for Small Business Administration (“SBA”) loans, United States Department of Agriculture (“USDA”) loans, and residential mortgage loans when the loan is sold but servicing is retained. This asset represents the right to service the loans and receive a fee in compensation. Servicing assets are initially recorded at their fair value as a component of the sale proceeds. The fair value of the servicing assets is based on an analysis of discounted cash flows that incorporates estimates of (1) market servicing costs, (2) market-based prepayment rates, and (3) market profit margins. Servicing assets are included in other assets. United has elected to subsequently measure the servicing assets for government guaranteed loans at fair value. There is no aggregation of the loans into pools for the valuation of the servicing asset, but rather the servicing asset value is measured at a loan level. Effective January 1, 2017, management elected to begin measuring residential mortgage servicing rights at fair value. The cumulative effect adjustment of this election to retained earnings, net of income tax effect, was $437,000 . The rate of prepayment of loans serviced is the most significant estimate involved in the measurement process. Estimates of prepayment rates are based on market expectations of future prepayment rates, industry trends, and other considerations. Actual prepayment rates will differ from those projected by management due to changes in a variety of economic factors, including prevailing interest rates and the availability of alternative financing sources to borrowers. If actual prepayments of the loans being serviced were to occur more quickly than projected, the carrying value of servicing assets might have to be written down through a charge to earnings in the current period. If actual prepayments of the loans being serviced were to occur more slowly than had been projected, the carrying value of servicing assets could increase, and servicing income would exceed previously projected amounts. United accounts for the servicing liabilities associated with sold equipment financing loans using the amortization method. Bank Owned Life Insurance United has purchased life insurance policies on certain key executives and members of management. United has also received life insurance policies on members of acquired bank management teams through acquisitions of other banks. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other changes or other amounts due that are probable at settlement. Operating Leases Effective January 1, 2019, United records a right-of-use asset, included in other assets, and a related lease liability, included in other liabilities, for eligible operating leases for which it is the lessee, which include leases for land, buildings, and equipment. Payments related to these leases consist primarily of base rent and, in the case of building leases, additional operating costs associated with the leased property such as common area maintenance and utilities. In most cases these operating costs vary over the term of the lease, and therefore are classified as variable lease costs, which are recognized as incurred in the consolidated statement of income. In addition, certain operating leases include costs such as property taxes and insurance, which are recognized as incurred in the consolidated statement of income. Many of United’s operating leases contain renewal options, most of which are excluded from the measurement of the right-of-use asset and lease liability as they are not reasonably certain to be exercised. United also subleases and leases certain real estate properties to third parties under operating leases. United does not recognize a lease liability or right-of-use asset on the consolidated balance sheet related to short-term leases with a term of less than one year. Lease payments for short-term leases are recognized as expense over the lease term. See Note 14 for additional information on operating leases. See Note 2 for further detail related to the adoption of ASU No. 2016-02, Leases (Topic 842) . Loan Commitments and Related Financial Instruments Financial instruments include off-balance sheet credit instruments such as commitments to make loans and commercial letters of credit issued to meet customer financing needs. The face amount for these items represents the exposure to loss before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded. Revenue from Contracts with Customers In addition to lending and related activities, United offers various services to customers that generate revenue, certain of which are governed by ASC Topic 606 Revenue from Contracts with Customers (“ASC 606”). United’s services that fall within the scope of ASC 606 are presented within noninterest income and include service charges and fees, brokerage fees, and other transaction-based fees. Revenue is recognized when the transactions occur or as services are performed over primarily monthly or quarterly periods. Payment is typically received in the period the transactions occur. Fees may be fixed or, where applicable, based on a percentage of transaction size. Income Taxes Deferred tax assets and liabilities are recorded for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Future tax benefits are recognized to the extent that realization of such benefits is more likely than not. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which the assets and liabilities are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income taxes during the period that includes the enactment date. In the event the future tax consequences of differences between the financial reporting bases and the tax bases of assets and liabilities results in deferred tax assets, an evaluation of the probability of being able to realize the future benefits indicated by such asset is required. A valuation allowance is provided for the portion of the deferred tax asset when it is more likely than not that some or all of the deferred tax asset will not be realized. In assessing the realizability of the deferred tax assets, management considers the scheduled reversals of deferred tax liabilities, projected future taxable earnings and prudent and feasible tax planning strategies. Management weighs both the positive and negative evidence, giving more weight to evidence that can be objectively verified. The income tax benefit or expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the la

Accounting Standards Updates an

Accounting Standards Updates and Recently Adopted Standards	12 Months Ended
	Dec. 31, 2019
Accounting Changes and Error Corrections [Abstract]
Accounting Standards Updates and Recently Adopted Standards	Accounting Standards Updates and Recently Adopted Standards Accounting Standards Updates In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . The new guidance, which was further modified by subsequent related updates, replaces the incurred loss impairment framework in current GAAP with a current expected credit loss (“CECL”) framework, which requires an estimate of credit losses for the remaining estimated life of the financial asset using historical experience, current conditions, and reasonable and supportable forecasts and generally applies to financial assets measured at amortized cost and some off-balance sheet credit exposures. Financial assets measured at amortized cost will be presented at the net amount expected to be collected by using an allowance for credit losses. Purchased credit deteriorated (“PCD”) loans will receive an initial allowance at the acquisition date that represents an adjustment to the amortized cost basis of the loan, with no impact to earnings. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses prospectively, with such allowance limited to the amount by which fair value is below amortized cost. United adopted ASC 326 as of January 1, 2020 using the modified retrospective method for loans, leases and off-balance sheet credit exposures. Adoption of this guidance resulted in an $8.75 million increase in the allowance for credit losses, comprised of increases in the allowance for loan losses of $6.88 million and the reserve for unfunded commitments of $1.87 million , with $3.59 million of the increase reclassified from the amortized cost basis of PCD financial assets that were previously classified as PCI. The cumulative effect adjustment to retained earnings was $3.53 million , net of tax. Calculated credit losses on held-to-maturity debt securities were not material and there was no impact to the available-for-sale portfolio or other financial instruments. The allowance for loan losses for the majority of loans and leases was calculated using a discounted cash flow methodology applied to fourteen portfolios with a one-year reasonable and supportable forecast period and a two-year straight-line reversion period. The increase in the allowance for loan losses at transition was primarily due to the equipment financing and residential mortgage portfolios. In connection with the adoption, management has implemented changes to relevant systems, processes and controls where necessary. Model validation was completed during the fourth quarter of 2019. In addition, management is in the final stages of implementing the accounting, reporting and governance processes to comply with the new guidance. United’s CECL allowance will fluctuate over time due to macroeconomic conditions and forecasts as well as the size and composition of the loan portfolios. With regard to PCD assets, because United has elected to break apart the former PCI pools and will no longer consider these pools to be the unit of account, contractually delinquent PCD loans will be reported as nonaccrual loans using the same criteria as other loans. Similarly, PCD loans that are restructured and meet the definition of troubled debt restructurings after the adoption of CECL will be reported as such. In April 2019, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825 Financial Instruments . In addition to amending guidance related to the new CECL standard, this update clarifies certain aspects of hedge accounting and recognition and measurement of financial instruments. United adopted this update as of January 1, 2020, with no material impact to the consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes . This update removes several exceptions related to intraperiod tax allocation when there is a loss from continuing operations and income from other items, foreign subsidiaries becoming equity method investments and vice versa, and calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. The guidance also amends requirements related to franchise tax that is partially based on income, a step up in the tax basis of goodwill, allocation of consolidated tax expense to a legal entity not subject to tax in its separate financial statements, the effects of enacted changes in tax laws and other minor codification improvements regarding employee stock ownership plans and investments in qualified affordable housing projects. For public entities, this guidance is effective for fiscal years beginning after December 15, 2020. United does not expect the new guidance to have a material impact on the consolidated financial statements. In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815)—Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the Emerging Issues Task Force) . This update clarifies whether an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting for the purposes of applying the measurement alternative and how to account for certain forward contracts and purchased options to purchase securities. For public entities, this guidance is effective for fiscal years beginning after December 15, 2020. United does not expect the new guidance to have a material impact on the consolidated financial statements. Standards Adopted in 2019 On January 1, 2019, United adopted ASU No. 2016-02, Leases (Topic 842) , as modified by ASU No. 2018-10, Codification Improvements to Topic 842 Leases , ASU No. 2018-11, Leases (Topic 842): Targeted Improvements , ASU No. 2018-20, Leases (Topic 842): Narrow-Scope Improvements for Lessors and ASU No. 2019-01, Leases (Topic 842): Codification Improvements . These standards require a lessee to recognize in the consolidated balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. United adopted the standard using the optional transition method, which allowed for a modified retrospective method of adoption with a cumulative effect adjustment to shareholders’ equity without restating comparable periods. United also elected the relief package of practical expedients for which there is no requirement to reassess existence of leases, their classification, and initial direct costs as well as an exemption for short-term leases with a term of less than one year, whereby United does not recognize a lease liability or right-of-use asset on the consolidated balance sheet but instead recognizes lease payments as an expense over the lease term as appropriate. The adoption of this guidance resulted in recognition of a right-of-use asset of $23.8 million , a lease liability of $26.8 million and a reduction of shareholders’ equity of $549,000 , net of tax, related to its operating leases. In addition, United has equipment financing leases for which it is the lessor, which were previously accounted for as capital leases. Upon adoption of Topic 842, these leases were classified as sales-type or direct financing leases, which required no significant change in accounting policy or treatment. These lease agreements may include options to renew and for the lessee to purchase the leased equipment at the end of the lease term. As a lessor, United elected to exclude sales taxes from consideration in lease contracts. In the opinion of management, the changes described above resulting from the adoption of the standard did not have a material impact on the consolidated financial statements. See Notes 7 and 14 for additional information on operating leases and equipment financing leases, respectively. See Note 1 for further accounting policy detail related to leases. In July of 2019, the FASB issued ASU No. 2019-07, Codification updates to SEC sections: amendments to SEC paragraphs pursuant to SEC final rule releases No. 33-10532, disclosure update and simplification, and nos. 33-10231 and 33-10442, investment company reporting modernization, and miscellaneous updates. This standard updates various SEC financial statement disclosure requirements, including disclosures related to bank holding companies. The standard was effective immediately, and did not have a material impact on disclosures. In March 2017, the FASB issued ASU No. 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities . This update shortens the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. For securities held at a discount, the discount will continue to be amortized to maturity. For public entities, this update is effective for fiscal years beginning after December 15, 2018, with modified retrospective application. The adoption of this update on January 1, 2019 did not have a material impact on the consolidated financial statements. In August 2017, The FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . This update expands and refines hedge accounting for both nonfinancial and financial risk components and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. This update also makes certain targeted improvements to simplify the application of hedge accounting guidance and ease the administrative burden of hedge documentation requirements and assessing hedge effectiveness. For public entities, this update is effective for fiscal years beginning after December 15, 2018. For cash flow and net investment hedges existing at the date of adoption, an entity should apply a cumulative-effect adjustment related to eliminating the separate measurement of ineffectiveness to accumulated other comprehensive income with a corresponding adjustment to the opening balance of retained earnings. The amended presentation and disclosure guidance is required prospectively. The adoption of this update on January 1, 2019 did not have a material impact on the consolidated financial statements. In June 2018, the FASB issued ASU No. 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting . This update expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. As a result, nonemployee share-based payment awards will be measured at the grant-date fair value of the equity instruments that an entity is obligated to issue when the service has been rendered, subject to the probability of satisfying performance conditions when applicable. For public entities, this update is effective for fiscal years beginning after December 15, 2018. The adoption of the new guidance on January 1, 2019 did not have a material impact on the consolidated financial statements as United does not currently grant equity awards to nonemployees other than directors and does not anticipate doing so. In June 2018, the FASB issued ASU No. 2018-08, Not for Profit Entities (Topic 958): Clarifying the Scope and the Accounting Guidance for Contributions Received and Contributions Made . This update clarifies the guidance about whether a transfer of assets (or the reduction, settlement or cancellation of liabilities) is a contribution or an exchange transaction. In addition, the guidance clarifies the determination of whether a transaction is conditional. For public entities, this update is effective for contributions made in fiscal years beginning after December 15, 2018. The adoption of the new guidance on January 1, 2019 did not have a material impact on the consolidated financial statements. In July 2018, the FASB issued ASU No. 2018-09, Codification Improvements to address stakeholder suggestions for minor corrections and clarifications within the codification. The transition and effective date guidance is based on the facts and circumstances of each amendment. Some of the amendments in this update do not require transition guidance and will be effective upon issuance of this update. However, many of the amendments in this update do have transition guidance with effective dates for annual periods beginning after December 15, 2018, for public business entities. The adoption of the new guidance on January 1, 2019 did not have a material impact on the consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . The update removes disclosures that are no longer considered cost beneficial, modifies certain requirements of disclosures, and adds disclosure requirements identified as relevant. For public entities, this guidance is effective for fiscal years ending after December 15, 2019 and, depending on the provision, requires either prospective or retrospective application to prior periods presented. The adoption of this update did not have a material impact on the consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract (a consensus of the FASB Emerging Issues Task Force) . This update aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal use software. For public entities, this guidance is effective for fiscal years ending after December 15, 2019 with either retrospective or prospective application. The adoption of this update did not have a material impact on the consolidated financial statements. In October 2018, the FASB issued ASU No. 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes . This update permits the use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes. For public entities, this guidance is effective for fiscal years beginning after December 15, 2018 and should be applied on a prospective basis for qualifying new or redesignated hedging relationships. The adoption of this update on January 1, 2019 did not have a material impact on the consolidated financial statements.

Mergers and Acquisitions

Mergers and Acquisitions	12 Months Ended
	Dec. 31, 2019
Business Combinations [Abstract]
Mergers and Acquisitions	Mergers and Acquisitions Acquisition of First Madison Bank & Trust On May 1, 2019, United completed the acquisition of First Madison Bank & Trust (“FMBT”). FMBT operated four banking offices in Athens-Clarke County, Georgia. In connection with the acquisition, United acquired $245 million of assets and assumed $213 million of liabilities. Under the terms of the merger agreement, FMBT shareholders received $52.1 million in cash. The fair value of consideration paid exceeded the fair value of the identifiable assets and liabilities acquired and resulted in the establishment of goodwill in the amount of $20.3 million , representing the intangible value of FMBT’s business and reputation within the markets it served. None of the goodwill recognized is expected to be deductible for income tax purposes. United is amortizing the related core deposit intangible of $2.80 million using the sum-of-the-years-digits method over 9.25 years , which represents the expected useful life of the asset. United’s operating results for the year ended December 31, 2019, include the operating results of the acquired business for the period subsequent to the acquisition date of May 1, 2019. The purchased assets and assumed liabilities were recorded at their acquisition date fair values and are summarized in the table below (in thousands) . As Recorded Fair Value (1) As Recorded by Assets Cash and cash equivalents $ 32,548 $ — $ 32,548 Loans 197,682 (5,188 ) 192,494 Allowance for loan losses (6,338 ) 6,338 — Premises and equipment, net 7,124 1,400 8,524 Bank owned life insurance 6,823 — 6,823 Net deferred tax asset 1,386 (1,229 ) 157 Core deposit intangible — 2,800 2,800 Other assets 1,032 246 1,278 Total assets acquired $ 240,257 $ 4,367 $ 244,624 Liabilities Deposits $ 211,884 $ 243 $ 212,127 Other liabilities 924 (207 ) 717 Total liabilities assumed 212,808 36 212,844 Excess of assets acquired over liabilities assumed $ 27,449 Aggregate fair value adjustments $ 4,331 Total identifiable net assets 31,780 Cash consideration transferred 52,093 Goodwill $ 20,313 (1) Fair values are preliminary and are subject to refinement for a period not to exceed one year after the closing date of an acquisition as information relative to closing date fair values becomes available. The following table presents additional information related to the acquired loan portfolio at the acquisition date (in thousands) : May 1, 2019 Accounted for pursuant to ASC 310-30: Contractually required principal and interest $ 13,145 Non-accretable difference 2,517 Cash flows expected to be collected 10,628 Accretable yield 1,300 Fair value $ 9,328 Excluded from ASC 310-30: Fair value $ 183,166 Gross contractual amounts receivable 218,855 Estimate of contractual cash flows not expected to be collected 8,826 Acquisition of Navitas On February 1, 2018, United completed the acquisition of Navitas, a specialty lending company providing equipment finance credit services to small and medium-sized businesses nationwide. In connection with the acquisition, United acquired $393 million of assets and assumed $350 million of liabilities. Under the terms of the merger agreement, Navitas shareholders received $130 million in total consideration, of which $84.5 million was paid in cash and $45.7 million was paid in United common stock. The fair value of consideration paid exceeded the fair value of the identifiable assets and liabilities acquired and resulted in the establishment of goodwill in the amount of $87.4 million , representing the intangible value of Navitas’s business and reputation within the markets it served. None of the goodwill recognized is expected to be deductible for income tax purposes. Since the acquisition date, within the one-year measurement period, United received additional information regarding the fair value of loans. As a result, the provisional value assigned to the acquired loans was reduced by $526,000 , partially offset by acquisition-related adjustments to deferred tax assets. The net of the adjustments was reflected as a $390,000 increase to goodwill. The purchased assets and assumed liabilities were recorded at their acquisition date fair values and are summarized in the table below (in thousands) . As Recorded by Navitas Fair Value Adjustments As Recorded by United Assets Cash and cash equivalents $ 27,700 — $ 27,700 Loans and leases, net 365,533 (7,181 ) 358,352 Premises and equipment, net 628 (304 ) 324 Net deferred tax asset — 2,873 2,873 Other assets 5,117 (1,066 ) 4,051 Total assets acquired $ 398,978 $ (5,678 ) $ 393,300 Liabilities Short-term borrowings $ 214,923 $ — $ 214,923 Long-term debt 119,402 — 119,402 Other liabilities 17,059 (951 ) 16,108 Total liabilities assumed 351,384 (951 ) 350,433 Excess of assets acquired over liabilities assumed $ 47,594 Aggregate fair value adjustments $ (4,727 ) Total identifiable net assets 42,867 Consideration transferred Cash 84,500 Common stock issued (1,443,987 shares) 45,746 Total fair value of consideration transferred 130,246 Goodwill $ 87,379 The following table presents additional information related to the acquired loan and lease portfolio at the acquisition date (in thousands) . February 1, 2018 Accounted for pursuant to ASC 310-30: Contractually required principal and interest $ 24,711 Non-accretable difference 5,505 Cash flows expected to be collected 19,206 Accretable yield 1,977 Fair value $ 17,229 Excluded from ASC 310-30: Fair value $ 341,123 Gross contractual amounts receivable 389,432 Estimate of contractual cash flows not expected to be collected 8,624 In January 2018, after announcement of its intention to acquire Navitas but prior to the completion of the acquisition, United purchased $19.9 million in loans from Navitas in a transaction separate from the business combination. Acquisition of Four Oaks FinCorp, Inc. On November 1, 2017, United completed the acquisition of Four Oaks FinCorp, Inc. (“FOFN”) and its wholly-owned bank subsidiary, Four Oaks Bank & Trust Company. FOFN operated 14 banking offices in the Raleigh, North Carolina area. In connection with the acquisition, United acquired $730 million of assets and assumed $658 million of liabilities. Under the terms of the merger agreement, FOFN shareholders received 0.6178 shares of United common stock and $1.90 for each share of FOFN common stock issued and outstanding at the closing date. The fair value of consideration paid exceeded the fair value of the identifiable assets and liabilities acquired and resulted in the establishment of goodwill in the amount of $53.5 million , representing the intangible value of FOFN’s business and reputation within the market it served. None of the goodwill recognized is expected to be deductible for income tax purposes. United is amortizing the related core deposit intangible of $7.83 million using the sum-of-the-years-digits method over 11.5 years , which represents the expected useful life of the asset. United amortized the related noncompete agreement intangibles of $908,000 using the straight line method over the one year terms of the agreements. In connection with the acquisition, United assumed $11.5 million in subordinated debentures and $12.4 million in trust preferred securities. See Note 13 for further information on long-term debt. During first quarter 2018, within the one-year measurement period, United received additional information regarding the acquisition date fair values of loans held for sale and servicing assets. As a result, the provisional values assigned to the acquired loans held for sale and servicing assets have been adjusted to $10.7 million and $65,000 , respectively, which represent an increase of $2.59 million and a decrease of $354,000 , respectively, from amounts previously disclosed. The tax effect of these adjustments was reflected as a decrease to the deferred tax asset of $1.08 million , with the net amount of $1.16 million reflected as a decrease to goodwill. The purchased assets and assumed liabilities were recorded at their acquisition date fair values and are summarized in the table below (in thousands). As Recorded by FOFN Fair Value Adjustments As Recorded by United Assets Cash and cash equivalents $ 48,652 $ 6 $ 48,658 Securities 114,190 782 114,972 Loans held for sale 13,976 (3,290 ) 10,686 Loans, net 491,721 (5,477 ) 486,244 Premises and equipment, net 11,251 1,147 12,398 Bank owned life insurance 20,339 — 20,339 Accrued interest receivable 1,858 (118 ) 1,740 Net deferred tax asset 18,333 (999 ) 17,334 Intangibles — 8,738 8,738 Other real estate owned 1,173 (514 ) 659 Other assets 8,792 (69 ) 8,723 Total assets acquired $ 730,285 $ 206 $ 730,491 Liabilities Deposits $ 563,840 $ 1,365 $ 565,205 Federal Home Loan Bank advances 65,000 224 65,224 Long-term debt 23,872 (4,125 ) 19,747 Other liabilities 7,330 60 7,390 Total liabilities assumed 660,042 (2,476 ) 657,566 Excess of assets acquired over liabilities assumed $ 70,243 Aggregate fair value adjustments $ 2,682 Total identifiable net assets 72,925 Consideration transferred Cash 12,802 Common stock issued (4,145,343 shares) 113,665 Total fair value of consideration transferred 126,467 Goodwill $ 53,542 The following table presents additional information related to the acquired loan portfolio at the acquisition date (in thousands) : November 1, 2017 Accounted for pursuant to ASC 310-30: Contractually required principal and interest $ 49,377 Non-accretable difference 8,244 Cash flows expected to be collected 41,133 Accretable yield 3,313 Fair value $ 37,820 Excluded from ASC 310-30: Fair value $ 448,462 Gross contractual amounts receivable 509,629 Estimate of contractual cash flows not expected to be collected 6,081 Acquisition of HCSB Financial Corporation On July 31, 2017, United completed the acquisition of HCSB Financial Corporation (“HCSB”) and its wholly-owned bank subsidiary, Horry County State Bank. HCSB operated eight branches in coastal South Carolina. In connection with the acquisition, United acquired $389 million of assets and assumed $347 million of liabilities. Under the terms of the merger agreement, HCSB shareholders received 0.0050 shares of United common stock for each share of HCSB common stock issued and outstanding at the closing date. The fair value of consideration paid exceeded the fair value of the identifiable assets and liabilities acquired and resulted in the establishment of goodwill in the amount of $24.2 million , representing the intangible value of HCSB’s business and reputation within the market it served. None of the goodwill recognized is expected to be deductible for income tax purposes. United is amortizing the related core deposit intangible of $3.48 million using the sum-of-the-years-digits method over six years , which represents the expected useful life of the asset. United amortized the related noncompete agreement intangibles of $2.24 million using the straight line method over the terms of the agreements, which vary between one year and two years . During second quarter 2018, within the one-year measurement period, United received additional information regarding the acquisition date fair value of premises and equipment. As a result, the provisional value assigned to the acquired premises and equipment has been adjusted to $7.42 million , which represents a decrease of $493,000 from the amount previously disclosed. The tax effect of this adjustment was reflected as an increase to the deferred tax asset of $190,000 , resulting in a net $303,000 increase to goodwill. The purchased assets and assumed liabilities were recorded at their acquisition date fair values and are summarized in the table below (in thousands) . As Recorded by HCSB Fair Value Adjustments As Recorded by United Assets Cash and cash equivalents $ 17,855 $ (2 ) $ 17,853 Securities 101,462 (142 ) 101,320 Loans, net 228,483 (12,536 ) 215,947 Premises and equipment, net 14,030 (6,606 ) 7,424 Bank owned life insurance 11,827 — 11,827 Accrued interest receivable 1,322 (275 ) 1,047 Net deferred tax asset — 25,579 25,579 Intangibles — 5,716 5,716 Other real estate owned 1,177 (372 ) 805 Other assets 1,950 (32 ) 1,918 Total assets acquired $ 378,106 $ 11,330 $ 389,436 Liabilities Deposits $ 318,512 $ 430 $ 318,942 Repurchase agreements 1,141 — 1,141 Federal Home Loan Bank advances 24,000 517 24,517 Other liabilities 1,955 91 2,046 Total liabilities assumed 345,608 1,038 346,646 Excess of assets acquired over liabilities assumed $ 32,498 Aggregate fair value adjustments $ 10,292 Total identifiable net assets 42,790 Consideration transferred Cash 31 Common stock issued (2,370,331 shares) 65,800 Total fair value of consideration transferred 65,831 Equity interest in HCSB held before the business combination 1,125 Goodwill $ 24,166 The following table presents additional information related to the acquired loan portfolio at the acquisition date (in thousands) : July 31, 2017 Accounted for pursuant to ASC 310-30: Contractually required principal and interest $ 46,069 Non-accretable difference 12,413 Cash flows expected to be collected 33,656 Accretable yield 3,410 Fair value $ 30,246 Excluded from ASC 310-30: Fair value $ 185,701 Gross contractual amounts receivable 212,780 Estimate of contractual cash flows not expected to be collected 3,985 Pro forma information - unaudited The following table discloses the impact of the mergers with FMBT, Navitas, FOFN, and HCSB since the respective acquisition dates through December 31 of the year of acquisition. The table also presents certain pro forma information as if FMBT had been acquired on January 1, 2018, Navitas had been acquired on January 1, 2017, and FOFN and HCSB had been acquired on January 1, 2016. These results combine the historical results of the acquired entities with United’s consolidated statements of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments and other acquisition-related activity, they are not necessarily indicative of what would have occurred had the acquisitions taken place in earlier years. For purposes of pro forma information, merger-related costs incurred in the year of acquisition are excluded from the actual acquisition year results and included in the pro forma acquisition year results. As a result, merger-related costs related to the acquisition of FMBT of $2.02 million are reflected in 2018 pro forma information and merger-related costs related to the acquisition of Navitas of $4.98 million are reflected in 2017 pro forma information. Merger-related costs related to the acquisitions of FOFN and HCSB of $8.71 million were reflected in the 2016 pro forma results which are not presented below. The following table presents the actual results and pro forma information for the periods indicated (in thousands) . (Unaudited) Year Ended December 31, Revenue Net Income 2019 Actual FMBT results included in statement of income since acquisition date $ 7,525 $ 4,053 Supplemental consolidated pro forma as if FMBT had been acquired January 1, 2018 563,872 187,124 2018 Actual Navitas results included in the statement of income since acquisition date $ 24,285 $ 7,149 Supplemental consolidated pro forma as if FMBT had been acquired January 1, 2018 and Navitas had been acquired January 1, 2017 539,152 171,218 2017 Actual FOFN results included in statement of income since acquisition date $ 5,265 $ 1,406 Actual HCSB results included in statement of income since acquisition date 5,775 1,385 Supplemental consolidated pro forma as if FOFN and HCSB had been acquired January 1, 2016 and Navitas had been acquired January 1, 2017 495,052 78,958

Cash Flows

Cash Flows	12 Months Ended
	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash Flows	Cash Flows During 2019 , 2018 and 2017 , loans having a value of $1.17 million , $3.02 million and $4.15 million , respectively, were transferred to foreclosed property. United accounts for sales of SBA/USDA loans on the trade date. At December 31, 2019 , 2018 and 2017 , United had unsettled sales of SBA/USDA loans of $8.19 million , $32.9 million and $27.5 million , respectively. During 2019 , United acquired, through a business combination, assets with a fair value totaling $265 million and liabilities with a fair value totaling $213 million , for net assets acquired of $52.1 million . During 2018 , United acquired, through a business combination, assets with a fair value totaling $481 million and liabilities with a fair value totaling $350 million , for net assets acquired of $130 million . Common stock issued pursuant to this business combination totaled $45.7 million . During 2017 , United acquired, through business combinations, assets with a fair value totaling $1.12 billion and liabilities with a fair value totaling $1.00 billion , for net assets acquired of $115 million . Common stock issued pursuant to these business combinations totaled $179 million

Balance Sheet Offsetting and Re

Balance Sheet Offsetting and Repurchase Agreements Accounted for as Secured Borrowings	12 Months Ended
	Dec. 31, 2019
Offsetting [Abstract]
Balance Sheet Offsetting and Repurchase Agreements Accounted for as Secured Borrowings	Balance Sheet Offsetting and Repurchase Agreements Accounted for as Secured Borrowings From time to time, United enters into repurchase agreements and reverse repurchase agreements and offsetting securities lending transactions with the same counterparty in transactions commonly referred to as collateral swaps that are subject to master netting agreements under which the balances are netted in the balance sheet. The following table presents a summary of amounts outstanding under reverse repurchase agreements, of which there were none as of December 31, 2019 , and derivative financial instruments, including those entered into in connection with the same counterparty under master netting agreements, as of the dates indicated (in thousands). Gross Amounts of Recognized Assets Gross Amounts Offset on the Balance Sheet Gross Amounts not Offset in the Balance Sheet December 31, 2019 Net Asset Balance Financial Instruments Collateral Received Net Amount Derivatives $ 35,007 $ — $ 35,007 $ (401 ) $ — $ 34,606 Total $ 35,007 $ — $ 35,007 $ (401 ) $ — $ 34,606 Gross Amounts of Recognized Liabilities Gross Amounts Offset on the Balance Sheet Gross Amounts not Offset in the Balance Sheet Net Liability Balance Financial Instruments Collateral Pledged Net Amount Derivatives $ 15,516 $ — $ 15,516 $ (401 ) $ (14,933 ) $ 182 Total $ 15,516 $ — $ 15,516 $ (401 ) $ (14,933 ) $ 182 Gross Amounts of Recognized Assets Gross Amounts Offset on the Balance Sheet Gross Amounts not Offset in the Balance Sheet December 31, 2018 Net Asset Balance Financial Instruments Collateral Received Net Amount Repurchase agreements / reverse repurchase agreements $ 50,000 $ (50,000 ) $ — $ — $ — $ — Derivatives 24,705 — 24,705 (973 ) (8,029 ) 15,703 Total $ 74,705 $ (50,000 ) $ 24,705 $ (973 ) $ (8,029 ) $ 15,703 Weighted average interest rate of reverse repurchase agreements 3.20 % Gross Amounts of Recognized Liabilities Gross Amounts Offset on the Balance Sheet Gross Amounts not Offset in the Balance Sheet Net Liability Balance Financial Instruments Collateral Pledged Net Amount Repurchase agreements / reverse repurchase agreements $ 50,000 $ (50,000 ) $ — $ — $ — $ — Derivatives 26,433 — 26,433 (973 ) (16,126 ) 9,334 Total $ 76,433 $ (50,000 ) $ 26,433 $ (973 ) $ (16,126 ) $ 9,334 Weighted average interest rate of repurchase agreements 2.45 % At December 31, 2019 , United recognized the right to reclaim cash collateral of $14.9 million . At December 31, 2019 , there was no cash collateral held for derivatives. At December 31, 2018 , United recognized the right to reclaim cash collateral of $16.1 million and the obligation to return cash collateral of $8.03 million . The right to reclaim cash collateral and the obligation to return cash collateral were included in the consolidated balance sheets in other assets and other liabilities, respectively. The following table presents additional detail regarding repurchase agreements accounted for as secured borrowings and the securities underlying these agreements as of December 31, 2018 (in thousands) . Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30 to 90 Days 91 to 110 Days Total As of December 31, 2018 Mortgage-backed securities $ — $ — $ 50,000 $ — $ 50,000 Total $ — $ — $ 50,000 $ — $ 50,000 Gross amount of recognized liabilities for repurchase agreements in offsetting disclosure $ 50,000 Amounts related to agreements not included in offsetting disclosure $ — United is obligated to promptly transfer additional securities if the market value of the securities falls below the repurchase agreement price. United manages this risk by maintaining an unpledged securities portfolio that it believes is sufficient to cover a decline in the market value of the securities sold under agreements to repurchase.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities At December 31, 2019 and 2018 , securities with a carrying value of $918 million and $925 million , respectively, were pledged to secure public deposits, derivatives and other secured borrowings. The cost basis, unrealized gains and losses, and fair value of debt securities held-to-maturity as of the dates indicated are as follows (in thousands) : Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value As of December 31, 2019 State and political subdivisions $ 45,479 $ 1,574 $ 9 $ 47,044 Residential mortgage-backed securities, Agency 153,967 2,014 694 155,287 Commercial mortgage-backed, Agency 84,087 1,627 141 85,573 Total $ 283,533 $ 5,215 $ 844 $ 287,904 As of December 31, 2018 State and political subdivisions $ 68,551 $ 952 $ 2,191 $ 67,312 Residential mortgage-backed securities, Agency 176,488 652 5,094 172,046 Commercial mortgage-backed, Agency 29,368 173 96 29,445 Total $ 274,407 $ 1,777 $ 7,381 $ 268,803 The cost basis, unrealized gains and losses, and fair value of debt securities available-for-sale as of the dates indicated are as follows (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value As of December 31, 2019 U.S. Treasuries $ 152,990 $ 1,628 $ — $ 154,618 U.S. Government agencies 2,848 188 1 3,035 State and political subdivisions 214,677 11,813 — 226,490 Residential mortgage-backed securities, Agency 1,030,948 12,022 726 1,042,244 Residential mortgage-backed securities, Non-agency 250,550 6,231 — 256,781 Commercial mortgage-backed, Agency 266,770 2,261 128 268,903 Commercial mortgage-backed, Non-agency 15,395 918 263 16,050 Corporate bonds 202,131 1,178 218 203,091 Asset-backed securities 104,298 743 1,672 103,369 Total $ 2,240,607 $ 36,982 $ 3,008 $ 2,274,581 As of December 31, 2018 U.S. Treasuries $ 150,712 $ 767 $ 2,172 $ 149,307 U.S. Government agencies 25,493 335 275 25,553 State and political subdivisions 234,750 907 1,716 233,941 Residential mortgage-backed securities, Agency 1,125,194 2,448 20,124 1,107,518 Residential mortgage-backed securities, Non-agency 339,186 980 1,774 338,392 Commercial mortgage-backed, Agency 384,222 1 7,339 376,884 Commercial mortgage-backed, Non-agency 15,441 186 594 15,033 Corporate bonds 200,582 502 1,921 199,163 Asset-backed securities 184,683 328 2,335 182,676 Total $ 2,660,263 $ 6,454 $ 38,250 $ 2,628,467 At year-end 2019 and 2018 , there were no holdings of debt obligations of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of shareholders’ equity. The following summarizes debt securities held-to-maturity in an unrealized loss position as of the dates indicated (in thousands) : Less than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of December 31, 2019 State and political subdivisions $ 10,117 $ 9 $ — $ — $ 10,117 $ 9 Residential mortgage-backed securities, Agency 16,049 64 48,237 630 64,286 694 Commercial mortgage-backed, Agency 21,841 87 1,685 54 23,526 141 Total unrealized loss position $ 48,007 $ 160 $ 49,922 $ 684 $ 97,929 $ 844 As of December 31, 2018 State and political subdivisions $ 7,062 $ 46 $ 34,146 $ 2,145 $ 41,208 $ 2,191 Residential mortgage-backed securities, Agency 6,579 61 136,376 5,033 142,955 5,094 Commercial mortgage-backed, Agency — — 4,290 96 4,290 96 Total unrealized loss position $ 13,641 $ 107 $ 174,812 $ 7,274 $ 188,453 $ 7,381 The following summarizes debt securities available-for-sale in an unrealized loss position as of the dates indicated (in thousands) : Less than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of December 31, 2019 U.S. Government agencies $ 404 $ 1 $ — $ — $ 404 $ 1 Residential mortgage-backed securities, Agency 228,611 576 18,294 150 246,905 726 Commercial mortgage-backed, Agency — — 33,517 128 33,517 128 Commercial mortgage-backed, Non-agency — — 4,864 263 4,864 263 Corporate bonds 19,742 216 998 2 20,740 218 Asset-backed securities 32,294 625 38,990 1,047 71,284 1,672 Total unrealized loss position $ 281,051 $ 1,418 $ 96,663 $ 1,590 $ 377,714 $ 3,008 As of December 31, 2018 U.S. Treasuries $ — $ — $ 120,391 $ 2,172 $ 120,391 $ 2,172 U.S. Government agencies — — 21,519 275 21,519 275 State and political subdivisions 15,160 28 133,500 1,688 148,660 1,716 Residential mortgage-backed securities, Agency 80,202 332 723,094 19,792 803,296 20,124 Residential mortgage-backed securities, Non-agency 154,381 476 52,266 1,298 206,647 1,774 Commercial mortgage-backed, Agency — — 355,292 7,339 355,292 7,339 Commercial mortgage-backed, Non-agency 4,552 594 — — 4,552 594 Corporate bonds — — 117,296 1,921 117,296 1,921 Asset-backed securities 74,492 1,879 31,968 456 106,460 2,335 Total unrealized loss position $ 328,787 $ 3,309 $ 1,555,326 $ 34,941 $ 1,884,113 $ 38,250 At December 31, 2019 , there were 51 debt securities available-for-sale and 33 debt securities held-to-maturity that were in an unrealized loss position. Management does not intend to sell nor believes it will be required to sell securities in an unrealized loss position prior to the recovery of its amortized cost basis. Unrealized losses at December 31, 2019 and 2018 were primarily attributable to changes in interest rates. Management evaluates securities for other-than-temporary impairment at least on a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. Consideration is given to the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, among other factors. In analyzing an issuer’s financial condition, management considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and industry analyst’s reports. No impairment charges were recognized during 2019 , 2018 or 2017 . Realized gains and losses are derived using the specific identification method for determining the cost of the securities sold. The following summarizes securities sales activities for the years ended December 31 (in thousands) : 2019 2018 2017 Proceeds from sales $ 352,106 $ 168,891 $ 340,540 Gross gains on sales $ 1,843 $ 2,082 $ 1,247 Gross losses on sales (2,864 ) (2,738 ) (1,205 ) Net (losses) gains on sales of securities $ (1,021 ) $ (656 ) $ 42 Income tax (benefit) expense attributable to sales $ (247 ) $ (132 ) $ 14 The amortized cost and fair value of debt available-for-sale and held-to-maturity securities at December 31, 2019 , by contractual maturity, are presented in the following table (in thousands) : Available-for-Sale Held-to-Maturity Amortized Cost Fair Value Amortized Cost Fair Value US Treasuries: Within 1 year $ 29,877 $ 29,962 $ — $ — 1 to 5 years 123,113 124,656 — — 152,990 154,618 — — US Government agencies: 1 to 5 years 405 404 — — More than 10 years 2,443 2,631 — — 2,848 3,035 — — State and political subdivisions: Within 1 year 935 939 1,350 1,369 1 to 5 years 54,102 55,491 11,761 12,370 5 to 10 years 22,585 23,766 6,202 6,866 More than 10 years 137,055 146,294 26,166 26,439 214,677 226,490 45,479 47,044 Corporate bonds: Within 1 year 170,007 170,380 — — 1 to 5 years 27,624 28,171 — — 5 to 10 years 3,500 3,542 — — More than 10 years 1,000 998 — — 202,131 203,091 — — Asset-backed securities: 1 to 5 years 1,585 1,578 — — More than 10 years 102,713 101,791 — — 104,298 103,369 — — Total securities other than mortgage-backed securities: Within 1 year 200,819 201,281 1,350 1,369 1 to 5 years 206,829 210,300 11,761 12,370 5 to 10 years 26,085 27,308 6,202 6,866 More than 10 years 243,211 251,714 26,166 26,439 Residential mortgage-backed securities 1,281,498 1,299,025 153,967 155,287 Commercial mortgage-backed securities 282,165 284,953 84,087 85,573 $ 2,240,607 $ 2,274,581 $ 283,533 $ 287,904

Loans and Leases and Allowance

Loans and Leases and Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Loans and Leases and Allowance for Credit Losses	Loans and Leases and Allowance for Credit Losses Major classifications of the loan and lease portfolio (collectively referred to as the “loan portfolio” or “loans”) are summarized as of the dates indicated as follows (in thousands) : December 31, 2019 2018 Owner occupied commercial real estate $ 1,720,227 $ 1,647,904 Income producing commercial real estate 2,007,950 1,812,420 Commercial & industrial 1,220,657 1,278,347 Commercial construction 976,215 796,158 Equipment financing 744,544 564,614 Total commercial 6,669,593 6,099,443 Residential mortgage 1,117,616 1,049,232 Home equity lines of credit 660,675 694,010 Residential construction 236,437 211,011 Consumer 128,232 122,013 Indirect auto — 207,692 Total loans 8,812,553 8,383,401 Less allowance for loan losses (62,089 ) (61,203 ) Loans, net $ 8,750,464 $ 8,322,198 At December 31, 2019 and 2018 , $1.30 million and $1.19 million , respectively, in overdrawn deposit accounts were reclassified as consumer loans. At December 31, 2019 and 2018 , loans with a carrying value of $4.06 billion and $3.98 billion were pledged as collateral to secure FHLB advances, securitized notes payable and other contingent funding sources. At December 31, 2019 , the carrying value and outstanding balance of PCI loans was $58.6 million and $83.1 million , respectively. At December 31, 2018 , the carrying value and outstanding balance of PCI loans was $74.4 million and $109 million , respectively. The following table presents changes in the value of the accretable yield for PCI loans for the years ended December 31 (in thousands) : 2019 2018 Balance at beginning of period $ 26,868 $ 17,686 Additions due to acquisitions 1,300 1,977 Accretion (17,885 ) (13,696 ) Reclassification from nonaccretable difference 9,237 15,326 Changes in expected cash flows that do not affect nonaccretable difference 4,400 5,575 Balance at end of period $ 23,920 $ 26,868 In addition to the accretable yield on PCI loans, the fair value adjustments on non-PCI purchased loans are also accreted to interest income over the life of the loans. At December 31, 2019 and 2018 , the remaining accretable net fair value discount on these loans was $5.00 million and $4.31 million , respectively, which included a net premium on acquired equipment financing loans. During 2019 , United sold $81.1 million of SBA/USDA guaranteed loans, $103 million of indirect auto loans, and $31.0 million of equipment financing receivables. The gains and losses on these loan sales were included in noninterest income on the consolidated statements of income. During 2018 and 2017 , United sold SBA/USDA guaranteed loans totaling $121 million and $117 million , respectively. At December 31, 2019 and 2018 , equipment financing assets included leases of $37.4 million and $30.4 million , respectively. The components of the net investment in leases, which included both sales-type and direct financing, are presented below (in thousands) . December 31, 2019 2018 Minimum future lease payments receivable $ 39,709 $ 31,915 Estimated residual value of leased equipment 3,631 3,593 Initial direct costs 842 827 Security deposits (989 ) (1,189 ) Purchase accounting premium 273 806 Unearned income (6,088 ) (5,568 ) Net investment in leases $ 37,378 $ 30,384 Minimum future lease payments expected to be received from equipment financing lease contracts as of December 31, 2019 are as follows (in thousands) : Year 2020 $ 14,772 2021 11,177 2022 7,549 2023 4,436 2024 1,462 Thereafter 313 Total $ 39,709 Allowance for Credit Losses and Loans Individually Evaluated for Impairment The allowance for loan losses represents management’s estimate of probable incurred losses in the loan portfolio as of the end of the period. The allowance for unfunded commitments is included in other liabilities in the consolidated balance sheets. Combined, the allowance for loan losses and allowance for unfunded commitments are referred to as the allowance for credit losses. The following table presents the balance and activity in the allowance for credit losses by portfolio segment for the periods indicated (in thousands) : Year Ended December 31, 2019 Beginning Balance Charge-Offs Recoveries Provision Ending Balance Owner occupied commercial real estate $ 12,207 $ (5 ) $ 375 $ (1,173 ) $ 11,404 Income producing commercial real estate 11,073 (1,227 ) 283 2,177 12,306 Commercial & industrial 4,802 (5,849 ) 852 5,461 5,266 Commercial construction 10,337 (290 ) 1,165 (1,544 ) 9,668 Equipment financing 5,452 (5,675 ) 781 6,826 7,384 Residential mortgage 8,295 (616 ) 481 (79 ) 8,081 Home equity lines of credit 4,752 (996 ) 610 209 4,575 Residential construction 2,433 (306 ) 157 220 2,504 Consumer 853 (2,390 ) 911 1,527 901 Indirect auto 999 (663 ) 186 (522 ) — Total allowance for loan losses 61,203 (18,017 ) 5,801 13,102 62,089 Allowance for unfunded commitments 3,410 — — 48 3,458 Total allowance for credit losses $ 64,613 $ (18,017 ) $ 5,801 $ 13,150 $ 65,547 Year Ended December 31, 2018 Beginning Balance Charge-Offs Recoveries Provision Ending Balance Owner occupied commercial real estate $ 14,776 $ (303 ) $ 1,227 $ (3,493 ) $ 12,207 Income producing commercial real estate 9,381 (3,304 ) 1,064 3,932 11,073 Commercial & industrial 3,971 (1,669 ) 1,390 1,110 4,802 Commercial construction 10,523 (622 ) 734 (298 ) 10,337 Equipment financing — (1,536 ) 460 6,528 5,452 Residential mortgage 10,097 (754 ) 336 (1,384 ) 8,295 Home equity lines of credit 5,177 (1,194 ) 423 346 4,752 Residential construction 2,729 (54 ) 376 (618 ) 2,433 Consumer 710 (2,445 ) 807 1,781 853 Indirect auto 1,550 (1,277 ) 228 498 999 Total allowance for loan losses 58,914 (13,158 ) 7,045 8,402 61,203 Allowance for unfunded commitments 2,312 — — 1,098 3,410 Total allowance for credit losses $ 61,226 $ (13,158 ) $ 7,045 $ 9,500 $ 64,613 Year Ended December 31, 2017 Beginning Balance Charge-Offs Recoveries Provision Ending Balance Owner occupied commercial real estate $ 16,446 $ (406 ) $ 980 $ (2,244 ) $ 14,776 Income producing commercial real estate 8,843 (2,985 ) 178 3,345 9,381 Commercial & industrial 3,810 (1,528 ) 1,768 (79 ) 3,971 Commercial construction 13,405 (1,023 ) 1,018 (2,877 ) 10,523 Equipment financing — — — — — Residential mortgage 8,545 (1,473 ) 314 2,711 10,097 Home equity lines of credit 4,599 (1,435 ) 567 1,446 5,177 Residential construction 3,264 (129 ) 178 (584 ) 2,729 Consumer 708 (1,803 ) 917 888 710 Indirect auto 1,802 (1,420 ) 284 884 1,550 Total allowance for loan losses 61,422 (12,202 ) 6,204 3,490 58,914 Allowance for unfunded commitments 2,002 — — 310 2,312 Total allowance for credit losses $ 63,424 $ (12,202 ) $ 6,204 $ 3,800 $ 61,226 The following table presents the recorded investment in loans by portfolio segment and the balance of the allowance for loan losses assigned to each segment based on the method of evaluating the loans for impairment for the periods indicated (in thousands) : Allowance for Credit Losses December 31, 2019 December 31, 2018 Individually evaluated for impairment Collectively evaluated for impairment PCI Ending Balance Individually evaluated for impairment Collectively evaluated for impairment PCI Ending Balance Owner occupied commercial real estate $ 816 $ 10,483 $ 105 $ 11,404 $ 862 $ 11,328 $ 17 $ 12,207 Income producing commercial real estate 770 11,507 29 12,306 402 10,671 — 11,073 Commercial & industrial 21 5,193 52 5,266 32 4,761 9 4,802 Commercial construction 55 9,613 — 9,668 71 9,974 292 10,337 Equipment financing — 7,240 144 7,384 — 5,045 407 5,452 Residential mortgage 782 7,296 3 8,081 861 7,410 24 8,295 Home equity lines of credit 16 4,541 18 4,575 1 4,740 11 4,752 Residential construction 47 2,456 1 2,504 51 2,382 — 2,433 Consumer 5 885 11 901 6 847 — 853 Indirect auto — — — — 26 973 — 999 Total allowance for loan losses 2,512 59,214 363 62,089 2,312 58,131 760 61,203 Allowance for unfunded commitments — 3,458 — 3,458 — 3,410 — 3,410 Total allowance for credit losses $ 2,512 $ 62,672 $ 363 $ 65,547 $ 2,312 $ 61,541 $ 760 $ 64,613 Loans Outstanding December 31, 2019 December 31, 2018 Individually evaluated for impairment Collectively evaluated for impairment PCI Ending Balance Individually evaluated for impairment Collectively evaluated for impairment PCI Ending Balance Owner occupied commercial real estate $ 19,233 $ 1,692,448 $ 8,546 $ 1,720,227 $ 17,602 $ 1,620,450 $ 9,852 $ 1,647,904 Income producing commercial real estate 18,134 1,962,588 27,228 2,007,950 16,584 1,757,525 38,311 1,812,420 Commercial & industrial 1,449 1,218,882 326 1,220,657 1,621 1,276,318 408 1,278,347 Commercial construction 3,675 965,678 6,862 976,215 2,491 787,760 5,907 796,158 Equipment financing 1,027 739,532 3,985 744,544 — 556,672 7,942 564,614 Residential mortgage 15,991 1,092,046 9,579 1,117,616 14,220 1,025,862 9,150 1,049,232 Home equity lines of credit 992 658,273 1,410 660,675 276 692,122 1,612 694,010 Residential construction 1,256 234,807 374 236,437 1,207 209,070 734 211,011 Consumer 214 127,682 336 128,232 211 121,269 533 122,013 Indirect auto — — — — 1,237 206,455 — 207,692 Total loans $ 61,971 $ 8,691,936 $ 58,646 $ 8,812,553 $ 55,449 $ 8,253,503 $ 74,449 $ 8,383,401 A loan is considered impaired when, based on current events and circumstances, it is probable that all amounts due according to the original contractual terms of the loan will not be collected. On a quarterly basis, management individually evaluates certain impaired loans, including all non-PCI nonaccrual relationships with a balance of $500,000 or greater and all troubled debt restructurings (“TDRs”) for impairment. Impairment for collateral dependent loans within this population is measured based on the fair value of the collateral. If impairment is identified, the loan is generally charged down to the fair value of the underlying collateral, less selling costs. Impairment for non-collateral dependent TDRs within this population is measured based on discounted cash flows or the loan’s observable market price. Impairment identified using these methods would result in the establishment of a specific reserve. Each quarter, management prepares an analysis of the allowance for credit losses to determine the appropriate balance that measures and quantifies the amount of probable incurred losses in the loan portfolio and unfunded loan commitments. The allowance is comprised of specific reserves on individually impaired loans, which are determined as described above, and general reserves, which are determined based on historical loss experience as adjusted for current trends and economic conditions multiplied by a loss emergence period factor. Management calculates the loss emergence period for each pool of loans based on the weighted average length of time between the date a loan first exceeds 30 days past due and the date the loan is charged off. On junior lien home equity loans, management has limited ability to monitor the delinquency status of the first lien unless the first lien is also held by United. As a result, management applies the weighted average historical loss factor for this category and appropriately adjusts it to reflect the increased risk of loss from these credits. Management reviews the resulting loss factors for each category of the loan portfolio and evaluates whether qualitative adjustments are necessary to take into consideration recent credit trends such as increases or decreases in past due, nonaccrual, criticized and classified loans, and other macro environmental factors such as changes in unemployment rates, employment rates, debt per capita, home price indices, and trends in real estate value indices. Management believes that its method of determining the balance of the allowance for credit losses provides a reasonable and reliable basis for measuring and reporting losses that are incurred in the loan portfolio as of the reporting date. When a loan officer determines that a loan is uncollectible, he or she is responsible for recommending that the loan be placed on nonaccrual status and evaluated for impairment, which, if necessary, could result in fully or partially charging off the loan or establishing a specific reserve. Full or partial charge-offs may also be recommended by the Collections Department, the Special Assets Department, the Loss Mitigation Department and the Foreclosure/OREO Department. Nonaccrual real estate loans that are collateral dependent are generally charged down to fair value less costs to sell at the time they are placed on nonaccrual status. Commercial, mortgage, and consumer asset quality committees meet monthly to review charge-offs that have occurred during the previous month. Participants include the respective Chief Commercial Credit Officer, Chief Retail Credit Officer, Senior Risk Officers, Senior Credit Officers, Regional Credit Managers, and Special Asset Officers. Generally, closed-end retail loans (installment and residential mortgage loans) past due 90 cumulative days are written down to their collateral value less estimated selling costs. Open-end (revolving) unsecured retail loans which are past due 90 cumulative days from their contractual due date are generally charged off. The following table presents loans individually evaluated for impairment by class of loans as of the dates indicated (in thousands) : December 31, 2019 December 31, 2018 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated With no related allowance recorded: Owner occupied commercial real estate $ 9,527 $ 8,118 $ — $ 8,650 $ 6,546 $ — Income producing commercial real estate 5,159 4,956 — 9,986 9,881 — Commercial & industrial 1,144 890 — 525 370 — Commercial construction 2,458 2,140 — 685 507 — Equipment financing 1,027 1,027 — — — — Total commercial 19,315 17,131 — 19,846 17,304 — Residential mortgage 7,362 6,436 — 5,787 5,202 — Home equity lines of credit 1,116 861 — 330 234 — Residential construction 731 626 — 554 428 — Consumer 66 53 — 18 17 — Indirect auto — — — 294 292 — Total with no related allowance recorded 28,590 25,107 — 26,829 23,477 — With an allowance recorded: Owner occupied commercial real estate 11,136 11,115 816 11,095 11,056 862 Income producing commercial real estate 13,591 13,178 770 6,968 6,703 402 Commercial & industrial 559 559 21 1,652 1,251 32 Commercial construction 1,535 1,535 55 2,130 1,984 71 Equipment financing — — — — — — Total commercial 26,821 26,387 1,662 21,845 20,994 1,367 Residential mortgage 9,624 9,555 782 9,169 9,018 861 Home equity lines of credit 146 131 16 45 42 1 Residential construction 643 630 47 791 779 51 Consumer 161 161 5 199 194 6 Indirect auto — — — 946 945 26 Total with an allowance recorded 37,395 36,864 2,512 32,995 31,972 2,312 Total $ 65,985 $ 61,971 $ 2,512 $ 59,824 $ 55,449 $ 2,312 As of December 31, 2019 and 2018 , United has allocated $2.51 million and $2.31 million , respectively, of specific reserves to customers whose loan terms have been modified in TDRs. As of December 31, 2019 and December 31, 2018 , there were no commitments to lend additional amounts to customers with outstanding loans classified as TDRs. The modification of the TDR terms included one or a combination of the following: a reduction of the stated interest rate of the loan or an extension of the amortization period that would not otherwise be considered in the current market for new debt with similar risk characteristics; a restructuring of the borrower’s debt into an “A/B note structure” in which the A note would fall within the borrower’s ability to pay and the remainder would be included in the B note; a mandated bankruptcy restructuring; or interest-only payment terms greater than 90 days where the borrower is unable to amortize the loan. Modified PCI loans are not accounted for as TDRs because they are not separated from the pools, and as such are not classified as impaired loans. Loans modified under the terms of a TDR during the years ended December 31 are presented in the table below. In addition, the following table presents loans modified under the terms of a TDR that defaulted (became 90 days or more delinquent) during the years ended December 31 that were initially restructured within one year prior to default (dollars in thousands) : New TDRs Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment by Type of Modification TDRs Modified Within the Year That Have Subsequently Defaulted Year Ended December 31, 2019 Rate Reduction Structure Other Total Number of Contracts Recorded Investment Owner occupied commercial real estate 4 $ 1,864 $ — $ 1,739 $ — $ 1,739 — $ — Income producing commercial real estate 3 9,126 — 9,013 — 9,013 — — Commercial & industrial 2 136 — 75 7 82 — — Commercial construction — — — — — — — — Equipment financing 9 1,071 — 1,071 — 1,071 — — Total commercial 18 12,197 — 11,898 7 11,905 — — Residential mortgage 15 2,102 — 2,057 — 2,057 1 135 Home equity lines of credit 1 50 — 50 — 50 — — Residential construction 1 22 — — 21 21 1 13 Consumer 5 46 — — 45 45 — — Indirect auto 15 271 — — 262 262 — — Total loans 55 $ 14,688 $ — $ 14,005 $ 335 $ 14,340 2 $ 148 Year Ended December 31, 2018 Owner occupied commercial real estate 5 $ 1,438 $ — $ 1,387 $ — $ 1,387 3 $ 1,869 Income producing commercial real estate 2 3,753 106 3,637 — 3,743 — — Commercial & industrial 2 108 — 32 — 32 1 232 Commercial construction — — — — — — 1 3 Equipment financing — — — — — — — — Total commercial 9 5,299 106 5,056 — 5,162 5 2,104 Residential mortgage 15 1,933 130 1,770 — 1,900 1 101 Home equity lines of credit 1 42 — — 41 41 — — Residential construction 2 47 — 32 13 45 — — Consumer 2 7 — — 7 7 — — Indirect auto 35 643 — — 643 643 — — Total loans 64 $ 7,971 $ 236 $ 6,858 $ 704 $ 7,798 6 $ 2,205 Year Ended December 31, 2017 Owner occupied commercial real estate 6 $ 2,603 $ — $ 2,161 $ 108 $ 2,269 — $ — Income producing commercial real estate 2 257 — — 252 252 — — Commercial & industrial 6 901 — 174 533 707 — — Commercial construction — — — — — — — — Equipment financing — — — — — — — — Total commercial 14 3,761 — 2,335 893 3,228 — — Residential mortgage 23 2,174 — 2,165 — 2,165 4 852 Home equity lines of credit 1 296 — — 176 176 — — Residential construction 4 135 40 95 — 135 — — Consumer 2 16 — 16 — 16 — — Indirect auto 34 786 — — 786 786 — — Total loans 78 $ 7,168 $ 40 $ 4,611 $ 1,855 $ 6,506 4 $ 852 Collateral dependent TDRs that subsequently default or are placed on nonaccrual are charged down to the fair value of the collateral consistent with United’s policy for nonaccrual loans. Impairment on TDRs that are not collateral dependent continues to be measured based on discounted cash flows regardless of whether the loan has subsequently defaulted. The average balances of impaired loans and income recognized on impaired loans while they were considered impaired is presented below for the last three years (in thousands) : 2019 2018 2017 Average Balance Interest Revenue Recognized During Impairment Cash Basis Interest Revenue Received Average Balance Interest Revenue Recognized During Impairment Cash Basis Interest Revenue Received Average Balance Interest Revenue Recognized During Impairment Cash Basis Interest Revenue Received Owner occupied commercial real estate $ 18,575 $ 1,124 $ 1,171 $ 19,881 $ 1,078 $ 1,119 $ 27,870 $ 1,271 $ 1,291 Income producing commercial real estate 14,253 739 730 17,138 893 895 24,765 1,265 1,178 Commercial & industrial 1,837 84 100 1,777 100 100 2,994 125 127 Commercial construction 3,233 129 146 3,247 176 174 5,102 225 229 Equipment financing 159 23 23 — — — — — — Total commercial 38,057 2,099 2,170 42,043 2,247 2,288 60,731 2,886 2,825 Residential mortgage 16,115 748 749 14,515 641 643 14,257 555 574 Home equity lines of credit 488 14 15 284 18 16 248 10 12 Residential construction 1,332 92 94 1,405 96 95 1,582 95 95 Consumer 203 15 15 249 18 18 292 22 22 Indirect auto 1,028 50 50 1,252 64 64 1,244 64 64 Total $ 57,223 $ 3,018 $ 3,093 $ 59,748 $ 3,084 $ 3,124 $ 78,354 $ 3,632 $ 3,592 Nonaccrual and Past Due Loans United’s policy is to place loans on nonaccrual status, when, in the opinion of management, the principal and interest on a loan is not likely to be repaid in full or when the loan becomes 90 days past due and is not well secured and in the process of collection. When a loan is classified on nonaccrual status, interest previously accrued, but not collected is reversed against current interest revenue. Principal and interest payments received on a nonaccrual loan are generally applied to reduce the loan’s recorded investment. PCI loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement remains unpaid after the due date of the scheduled payment. However, these loans are considered as performing, even though they may be contractually past due, as any non-payment of contractual principal or interest is considered in the periodic re-estimation of expected cash flows and is included in the resulting recognition of current period loan loss provision or future period yield adjustments. No PCI loans were classified as nonaccrual at December 31, 2019 or 2018 as the cash flows of the respective loan or pool of loans were considered estimable and probable of collection. Therefore, interest revenue, through accretion of the difference between the carrying value of the loans and the expected cash flows, is being recognized on all PCI loans. The gross additional interest revenue that would have been earned if the loans classified as nonaccrual had performed in accordance with the original terms was approximately $1.26 million , $1.09 million , and $1.11 million for 2019 , 2018 , and 2017 , respectively. The following table presents the recorded investment in nonaccrual loans held for investment by loan class as of the dates indicated (in thousands) : December 31, 2019 2018 Owner occupied commercial real estate $ 10,544 $ 6,421 Income producing commercial real estate 1,996 1,160 Commercial & industrial 2,545 1,417 Commercial construction 2,277 605 Equipment financing 3,141 2,677 Total commercial 20,503 12,280 Residential mortgage 10,567 8,035 Home equity lines of credit 3,173 2,360 Residential construction 939 288 Consumer 159 89 Indirect auto — 726 Total $ 35,341 $ 23,778 Excluding PCI loans, substantially all loans more than 90 days past due were on nonaccrual status at December 31, 2019 and December 31, 2018 . The following table presents the aging of the recorded investment in past due loans by class of loans as of the dates indicated (in thousands) : Loans Past Due 30 - 59 Days 60 - 89 Days > 90 Days Total Loans Not Past Due PCI Loans Total As of December 31, 2019 Owner occupied commercial real estate $ 2,913 $ 2,007 $ 6,079 $ 10,999 $ 1,700,682 $ 8,546 $ 1,720,227 Income producing commercial real estate 562 706 401 1,669 1,979,053 27,228 2,007,950 Commercial & industrial 2,140 491 2,119 4,750 1,215,581 326 1,220,657 Commercial construction 1,867 557 96 2,520 966,833 6,862 976,215 Equipment financing 2,065 923 3,045 6,033 734,526 3,985 744,544 Total commercial 9,547 4,684 11,740 25,971 6,596,675 46,947 6,669,593 Residential mortgage 5,655 2,212 2,171 10,038 1,097,999 9,579 1,117,616 Home equity lines of credit 1,697 421 1,385 3,503 655,762 1,410 660,675 Residential construction 325 125 402 852 235,211 374 236,437 Consumer 668 181 27 876 127,020 336 128,232 Total loans $ 17,892 $ 7,623 $ 15,725 $ 41,240 $ 8,712,667 $ 58,646 $ 8,812,553 As of December 31, 2018 Owner occupied commercial real estate $ 2,542 $ 2,897 $ 1,011 $ 6,450 $ 1,631,602 $ 9,852 $ 1,647,904 Income producing commercial real estate 1,624 291 301 2,216 1,771,893 38,311 1,812,420 Commercial & industrial 7,189 718 400 8,307 1,269,632 408 1,278,347 Commercial construction 267 — 68 335 789,916 5,907 796,158 Equipment financing 1,351 739 2,658 4,748 551,924 7,942 564,614 Total commercial 12,973 4,645 4,438 22,056 6,014,967 62,420 6,099,443 Residential mortgage 5,461 1,788 1,950 9,199 1,030,883 9,150 1,049,232 Home equity lines of credit 2,112 864 902 3,878 688,520 1,612 694,010 Residential construction 509 63 190 762 209,515 734 211,011 Consumer 600 82 21 703 120,777 533 122,013 Indirect auto 750 323 633 1,706 205,986 — 207,692 Total loans $ 22,405 $ 7,765 $ 8,134 $ 38,304 $ 8,270,648 $ 74,449 $ 8,383,401 Risk Ratings United categorizes commercial loans, with the exception of equipment financing receivables, into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current industry and economic trends, among other factors. United analyzes loans individually by classifying the loans as to credit risk. This analysis is performed on a continual basis. United uses the following definitions for its risk ratings: Watch . Loans in this category are presently protected from apparent loss, however weaknesses exist that could cause future impairment, including the deterioration of financial ratios, past due status and questionable management capabilities. These loans require more than the ordinary amount of supervision. Collateral values generally afford adequate coverage, but may not be immediately marketable. Substandard. These loans are inadequately protected by the current net worth and paying capacity of the obligor or by the collateral pledged. Specific and well-defined weaknesses exist that may include poor liquidity and deterioration of financial ratios. The loan may be past due and related deposit accounts experiencing overdrafts. There is the distinct possibility that United will sustain some loss if deficiencies are not corrected. If possible, immediate corrective action is taken. Doubtful. Specific weaknesses characterized as Substandard that are severe enough to make collection in full highly questionable and improbable. There is no reliable secondary source of full repayment. Loss. Loans categorized as Loss have the same characteristics as Doubtful however probability of loss is certain. Loans classified as Loss are charged off. Equipment Financing Receivables and Consumer Purpose Loans . United applies a pass / fail grading system to all equipment financing receivables and consumer purpose loans. Under the pass / fail grading system, loans that become past due 90 days or are in bankruptcy are classified as “fail” and all other loans are classified as “pass”. For reporting purposes, loans in these categories that are classified as “fail” are reported in the substandard column and all other loans are reported in the “pass” column. Loans not meeting the criteria above that are analyzed individually as part of the above described process are considered to be pass rated loans. As of December 31, and based on the most recent analysis performed, the risk category of loans by class of loans is as follows (in thousands) : Pass Watch Substandard Doubtful / Loss Total As of December 31, 2019 Owner occupied commercial real estate $ 1,638,398 $ 24,563 $ 48,720 $ — $ 1,711,681 Income producing commercial real estate 1,914,524 40,676 25,522 — 1,980,722 Commercial & industrial 1,156,366 16,385 47,580 — 1,220,331 Commercial construction 960,251 2,298 6,804 — 969,353 Equipment financing 737,418 — 3,141 — 740,559 Total commercial 6,406,957 83,922 131,767 — 6,622,646 Residential mortgage 1,093,902 — 14,135 — 1,108,037 Home equity lines of credit 654,619 — 4,646 — 659,265 Residential construction 234,791 — 1,272 — 236,063 Consumer 127,507 8 381 — 127,896 Total loans, excluding PCI loans 8,517,776 83,930 152,201 — 8,753,907 Owner occupied commercial real estate 3,238 2,797 2,511 — 8,546 Income producing commercial real estate 19,648 6,305 1,275 — 27,228 Commercial & industrial 104 81 141 — 326 Commercial construction 3,628 590 2,644 — 6,862 Equipment financing 3,952 — 33 — 3,985 Total commercial 30,570 9,773 6,604 — 46,947 Residential mortgage 8,112 — 1,467 — 9,579 Home equity lines of credit 1,350 — 60 — 1,410 Residential construction 348 — 26 — 374 Consumer 303 — 33 — 336 Total PCI loans 40,683 9,773 8,190 — 58,646 Total loan portfolio $ 8,558,459 $ 93,703 $ 160,391 $ — $ 8,812,553 As of December 31, 2018 Owner occupied commercial real estate $ 1,585,797 $ 16,651 $ 35,604 $ — $ 1,638,052 Income producing commercial real estate 1,735,456 20,923 17,730 — 1,774,109 Commercial & industrial 1,247,206 8,430 22,303 — 1,277,939 Commercial construction 777,780 4,533 7,938 — 790,251 Equipment financing 553,995 — 2,677 — 556,672 Total commercial 5,900,234 50,537 86,252 — 6,037,023 Residential mortgage 1,028,660 — 11,422 — 1,040,082 Home equity lines of credit 688,493 — 3,905 — 692,398 Residential construction 209,744 — 533 — 210,277 Consumer 121,247 19 214 — 121,480 Indirect auto 205,632 — 2,060 — 207,692 Total loans, excluding PCI loans 8,154,010 50,556 104,386 — 8,308,952 Owner occupied commercial real estate 3,352 2,774 3,726 — 9,852 Income producing commercial real estate 23,430 13,403 1,478 — 38,311 Commercial & industrial 266 48 94 — 408 Commercial construction 3,503 188 2,216 — 5,907 Equipment financing 7,725 — 217 — 7,942 Total commercial 38,276 16,413 7,731 — 62,420 Residential mortgage 6,914 — 2,236 — 9,150 Home equity lines of credit 1,492 — 120 — 1,612 Residential construction 687 — 47 — 734 Consumer 493 — 40 — 533 Indirect auto — — — — — Total PCI loans 47,862 16,413 10,174 — 74,449 Total loan portfolio $ 8,201,872 $ 66,969 $ 114,560 $ — $ 8,383,401

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment Premises and equipment are summarized as follows as of the dates indicated (in thousands) : December 31, 2019 2018 Land and land improvements $ 81,150 $ 78,066 Buildings and improvements 170,629 153,980 Furniture and equipment 97,997 93,854 Construction in progress 1,701 5,350 351,477 331,250 Less accumulated depreciation (135,501 ) (125,110 ) Premises and equipment, net $ 215,976 $ 206,140 Depreciation expense was $15.3 million , $14.2 million and $12.0 million for 2019 , 2018 and 2017 , respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The carrying amount of goodwill and other intangible assets is summarized below as of the dates indicated (in thousands) : December 31, 2019 2018 Core deposit intangible (1) $ 32,802 $ 62,652 Less: accumulated amortization (1) (17,980 ) (46,141 ) Net core deposit intangible 14,822 16,511 Noncompete agreement 3,144 3,144 Less: accumulated amortization (3,144 ) (2,695 ) Net noncompete agreement — 449 Total intangibles subject to amortization, net 14,822 16,960 Goodwill 327,425 307,112 Total goodwill and other intangible assets, net $ 342,247 $ 324,072 (1) Balances for 2019 exclude fully amortized core deposit intangibles. The following is a summary of changes in the carrying amounts of goodwill for the years indicated (in thousands) : Goodwill (1) December 31, 2017 $ 220,591 Acquisition of Navitas 87,379 Measurement period adjustments - FOFN and HCSB (858 ) December 31, 2018 307,112 Acquisition of FMBT 20,313 December 31, 2019 $ 327,425 (1) Goodwill balances presented as of December 31, 2019, 2018, and 2017 are shown net of accumulated impairment losses of $306 million incurred prior to 2017. Gross goodwill for December 31, 2019, 2018, and 2017 totaled $633 million , $613 million and $526 million , respectively. The estimated aggregate amortization expense for future periods for core deposit intangibles is as follows (in thousands) : Year 2020 $ 3,842 2021 3,019 2022 2,379 2023 1,852 2024 1,431 Thereafter 2,299 Total $ 14,822

Servicing Assets and Liabilitie

Servicing Assets and Liabilities	12 Months Ended
	Dec. 31, 2019
Transfers and Servicing [Abstract]
Servicing Assets and Liabilities	Servicing Assets and Liabilities Servicing Rights for SBA/USDA Loans United accounts for servicing rights for SBA/USDA loans at fair value. The following table summarizes the changes in SBA/USDA servicing rights for the years indicated ( in thousands ) 2019 2018 2017 Servicing rights for SBA/USDA loans, beginning of period $ 7,510 $ 7,740 $ 5,752 Additions: Acquired servicing rights (1) — (354 ) 419 Originated servicing rights capitalized upon sale of loans 1,835 2,573 2,737 Subtractions: Disposals (1,258 ) (810 ) (621 ) Changes in fair value: Due to change in inputs or assumptions used in the valuation model (1,293 ) (1,639 ) (547 ) Servicing rights for SBA/USDA loans, end of period $ 6,794 $ 7,510 $ 7,740 (1) Includes measurement period adjustments further discussed in Note 3. The portfolio of SBA/USDA loans serviced for others, which is not included in the accompanying balance sheets, was $411 million and $386 million , respectively, at December 31, 2019 and 2018 . The amount of contractually specified servicing fees earned by United on these servicing rights during the years ended December 31, 2019 , 2018 and 2017 was $3.82 million , $3.44 million and $2.60 million , respectively. A summary of the key characteristics, inputs, and economic assumptions used in the discounted cash flow method utilized to estimate the fair value of the servicing asset for SBA/USDA loans and the sensitivity of the fair values to immediate adverse changes in those assumptions are shown in the table below as of the dates indicated (dollars in thousands) : December 31, 2019 2018 Fair value of retained servicing assets $ 6,794 $ 7,510 Prepayment rate assumption 16.5 % 12.1 % 10% adverse change $ (352 ) $ (267 ) 20% adverse change $ (671 ) $ (515 ) Discount rate 12.3 % 14.5 % 100 bps adverse change $ (184 ) $ (196 ) 200 bps adverse change $ (358 ) $ (381 ) Weighted-average life (years) 3.9 5.0 Weighted-average gross margin 1.9 % 1.9 % The above sensitivities are hypothetical and changes in fair value based on variations in assumptions generally cannot be extrapolated because the relationship of the change in assumption to the change in fair value may not be linear. Also, in this table, the effect of a variation in a particular assumption is calculated without changing any other assumption. In reality, changes in one factor may result in changes in another, which might magnify or counteract the sensitivities. Residential Mortgage Servicing Rights United accounts for residential mortgage servicing rights at fair value. The following table summarizes the changes in residential mortgage servicing rights for the years indicated ( in thousands ). 2019 2018 2017 Residential mortgage servicing rights, beginning of period $ 11,877 $ 8,262 $ 4,372 Additions: Originated servicing rights capitalized upon sale of loans 5,783 4,587 3,602 Subtractions: Disposals (1,098 ) (537 ) (328 ) Changes in fair value: Initial election to carry at fair value on January 1, 2017 — — 698 Due to change in inputs or assumptions used in the valuation (2,997 ) (435 ) (82 ) Residential mortgage servicing rights, end of period $ 13,565 $ 11,877 $ 8,262 The portfolio of residential mortgage loans serviced for others, which is not included in the consolidated balance sheets, was $1.60 billion and $1.21 billion , respectively, at December 31, 2019 and 2018 . The amount of contractually specified servicing fees earned by United on these servicing rights during the year ended December 31, 2019 , 2018 and 2017 was $3.67 million , $2.37 million and $1.72 million , respectively. A summary of the key characteristics, inputs, and economic assumptions used to estimate the fair value of the servicing asset for residential mortgage loans and the sensitivity of the fair values to immediate adverse changes in those assumptions are shown in the table below as of the dates indicated (in thousands) : December 31, 2019 2018 Fair value of retained servicing assets $ 13,565 $ 11,877 Prepayment rate assumption 14.1 % 10.6 % 10% adverse change $ (662 ) $ (466 ) 20% adverse change $ (1,270 ) $ (898 ) Discount rate 10.0 % 10.0 % 100 bps adverse change $ (467 ) $ (448 ) 200 bps adverse change $ (900 ) $ (863 ) The above sensitivities are hypothetical and changes in fair value based on variations in assumptions generally cannot be extrapolated because the relationship of the change in assumption to the change in fair value may not be linear. Also, in this table, the effect of a variation in a particular assumption is calculated without changing any other assumption. In reality, changes in one factor may result in changes in another, which might magnify or counteract the sensitivities. Servicing Liability for Equipment Financing Loans United accounts for the servicing liability associated with sold equipment finance loans using the amortization method. The portfolio of equipment financing loans serviced for others, which is not included in the accompanying balance sheets, was $42.4 million and $28.4 million at December 31, 2019 and 2018, respectively. The servicing liability related to these loans totaled $363,000 and $207,000 at December 31, 2019 and 2018, respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2019
Deposits [Abstract]
Deposits	Deposits At December 31, 2019 , the contractual maturities of time deposits, including brokered time deposits, are summarized as follows (in thousands) : 2020 $ 1,639,355 2021 187,367 2022 41,402 2023 12,451 2024 8,064 thereafter 56,444 Total time deposits $ 1,945,083 At December 31, 2019 and 2018 , time deposits, excluding brokered time deposits, that met or exceeded the FDIC insurance limit of $250,000 totaled $367 million and $262 million , respectively. At December 31, 2019 and 2018 , United held $85.5 million and $544 million , respectively, in certificates of deposit obtained through third party brokers. The daily average balance of these brokered deposits totaled $241 million and $347 million in 2019 and 2018 , respectively. The brokered certificates of deposit at December 31, 2019 had maturities ranging from 2020 through 2033 and are callable by United. United has certain market-linked brokered deposits that are considered hybrid instruments that contain embedded derivatives that have been bifurcated from the host contract leaving host instruments paying a rate of 90 day London Interbank Offered Rate (“LIBOR”) minus a spread that, at times, has resulted in a negative yield.

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances	12 Months Ended
	Dec. 31, 2019
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Advances	Federal Home Loan Bank Advances At December 31, 2018 , United had FHLB advances totaling $160 million with a weighted average interest rate of 2.52% . At December 31, 2019 , United had no FHLB advances outstanding. FHLB advances are collateralized by owner occupied and income producing commercial real estate and residential mortgage loans, investment securities and FHLB stock.

Long-term Debt

Long-term Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt Long-term debt consisted of the following (in thousands) : December 31, Issue Date Stated Maturity Date Earliest Call Date 2019 2018 Interest Rate Obligations of the Bank and its Subsidiaries: NER 16-1 Class A-2 notes $ — $ 19,975 2016 2021 n/a 2.20% NER 16-1 Class B notes — 25,489 2016 2021 n/a 3.22% NER 16-1 Class C notes — 6,319 2016 2021 n/a 5.05% NER 16-1 Class D notes — 3,213 2016 2023 n/a 7.87% Total securitized notes payable — 54,996 Obligations of the Holding Company: 2022 senior debentures 50,000 50,000 2015 2022 2020 5.000% through August 13, 2020, 3-month LIBOR plus 3.814% thereafter 2027 senior debentures 35,000 35,000 2015 2027 2025 5.500% through August 13, 2025, 3-month LIBOR plus 3.71% thereafter Total senior debentures 85,000 85,000 2028 subordinated debentures 100,000 100,000 2018 2028 2023 4.500% through January 30, 2023, 3-month LIBOR plus 2.12% thereafter 2025 subordinated debentures 11,250 11,500 2015 2025 2020 6.250% Total subordinated debentures 111,250 111,500 Southern Bancorp Capital Trust I 4,382 4,382 2004 2034 2009 Prime + 1.00% Tidelands Statutory Trust I 8,248 8,248 2006 2036 2011 3-month LIBOR plus 1.38% Four Oaks Statutory Trust I 12,372 12,372 2006 2036 2011 3-month LIBOR plus 1.35% Total trust preferred securities 25,002 25,002 Less discount (8,588 ) (9,309 ) Total long-term debt $ 212,664 $ 267,189 Interest is currently paid at least semiannually for all senior and subordinated debentures, securitized notes payable and trust preferred securities. Senior Debentures The 2022 senior debentures are redeemable, in whole or in part, on or after August 14, 2020 at a redemption price equal to 100% of the principal amount to be redeemed plus any accrued and unpaid interest, and will mature on February 14, 2022 if not redeemed prior to that date. The 2027 senior debentures are redeemable, in whole or in part, on or after August 14, 2025 at a redemption price equal to 100% of the principal amount to be redeemed plus any accrued and unpaid interest, and will mature on February 14, 2027 if not redeemed prior to that date. Subordinated Debentures United acquired, as part of the FOFN acquisition, $11.5 million aggregate principal amount of subordinated debentures. The notes are due on November 30, 2025 . United may prepay the notes at any time after November 30, 2020 , subject to compliance with applicable laws. In January 2018, United issued $100 million fixed to floating rate subordinated notes due January 30, 2028 . The subordinated debentures qualify as Tier 2 regulatory capital. Securitized Notes Payable United acquired, as part of the Navitas acquisition, NER 16-1, which is a bankruptcy-remote securitization entity whose sole purpose is to receive loans to secure financings. NER 16-1 provided financing by issuing notes to investors through a private offering of Receivable-Backed Notes under Rule 144A of the Securities and Exchange Act of 1934. These notes are collateralized by specific qualifying loans and by cash placed in restricted cash accounts. These notes will continue amortizing sequentially based on collections on the underlying loans available to pay the note holders at each monthly payment date after payment of certain amounts as specified in the securitization documents including fees to various parties to the securitizations, interest due to the note holders and certain other payments. Sequentially, each subsequent class of note holders receive principal payments until paid down in full prior to the remaining subsequent class of note holders receiving principal payments. In addition to the pay-downs on these notes, they also have legal final maturity dates as reflected in the table above. During 2019, NER 16-1 executed a payoff and termination of the remaining notes outstanding in accordance with the terms of the related securitization documents. Trust Preferred Securities Trust preferred securities qualify as Tier 1 capital under risk based capital guidelines subject to certain limitations. The trust preferred securities are mandatorily redeemable upon maturity, or upon earlier redemption as provided in the indentures.

Operating Leases

Operating Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Operating Leases	Operating Leases As of December 31, 2019 , United had a right-of-use asset and lease liability of $19.9 million and $22.0 million , respectively, included in other assets and other liabilities, respectively, on the balance sheet. The table below presents the operating lease income and expense recognized for the year ended December 31, 2019 (in thousands) . 2019 Income Statement Location Operating lease cost $ 5,067 Occupancy expense Variable lease cost 449 Occupancy expense Short-term lease cost 136 Occupancy expense Total lease cost $ 5,652 Sublease income and rental income from owned properties under operating leases $ 1,160 Other noninterest income As of December 31, 2019 , the weighted average remaining lease term and weighted average discount rate of operating leases was 5.33 years and 2.79% , respectively. Absent a readily determinable interest rate in the lease agreement, the discount rate applied to each individual lease obligation was the Bank’s incremental borrowing rate for secured borrowings. As of December 31, 2019 , future minimum lease payments under operating leases were as follows (in thousands) : Year 2020 $ 4,939 2021 5,124 2022 4,694 2023 3,992 2024 1,728 Thereafter 3,364 Total 23,841 Less discount (1,802 ) Present value of lease liability $ 22,039 As discussed in Note 2, United adopted Topic 842 using the modified retrospective method with a cumulative effect adjustment to shareholders’ equity without restating comparable periods. As a result, disclosures for comparative periods under the predecessor standard, ASC 840, Leases, are required in the year of transition. As of December 31, 2018, rent commitments under operating leases were $5.35 million , $5.16 million , $4.91 million , $4.48 million , and $3.91 million , for 2019 through 2023, respectively, and $5.04 million in the aggregate for years thereafter. Rent expense recorded in accordance with ASC 840 for the years ended December 31, 2018 and 2017 was $4.70 million and $4.32 million

Reclassifications Out of Accumu

Reclassifications Out of Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Reclassifications Out of Accumulated Other Comprehensive Income	Reclassifications Out of Accumulated Other Comprehensive Income The following presents the details regarding amounts reclassified out of accumulated other comprehensive income (in thousands). Amounts Reclassified from Accumulated Other Comprehensive Income For the Years Ended December 31, Details about Accumulated Other Comprehensive Income Components Affected Line Item in the Statement Where Net Income is Presented 2019 2018 2017 Realized (losses) gains on available-for-sale securities: $ (1,021 ) $ (656 ) $ 42 Securities (losses) gains, net 247 132 (14 ) Income tax benefit (expense) $ (774 ) $ (524 ) $ 28 Net of tax Amortization of losses included in net income on available-for-sale securities transferred to held to maturity: $ (383 ) $ (739 ) $ (1,069 ) Investment securities interest revenue 92 180 401 Income tax benefit $ (291 ) $ (559 ) $ (668 ) Net of tax Amortization of losses included in net income on terminated derivative financial instruments previously accounted for as cash flow hedges: $ (235 ) $ — $ — Other expense (102 ) (499 ) (599 ) Deposit interest expense — — (292 ) Federal Home Loan Bank advances interest expense (337 ) (499 ) (891 ) Total before tax 86 129 346 Income tax benefit $ (251 ) $ (370 ) $ (545 ) Net of tax Reclassification of disproportionate tax effect related to terminated and current cash flow hedges: $ — $ — $ (3,289 ) Income tax expense Reclassifications related to defined benefit pension plan activity: Prior service cost $ (640 ) $ (666 ) $ (560 ) Salaries and employee benefits expense Actuarial losses (59 ) (241 ) — Other expense Actuarial losses — — (238 ) Salaries and employee benefits expense Termination of defined benefit pension plan (1,558 ) — — Merger-related and other (2,257 ) (907 ) (798 ) Total before tax 576 247 310 Income tax benefit $ (1,681 ) $ (660 ) $ (488 ) Net of tax Total reclassifications for the period $ (2,997 ) $ (2,113 ) $ (4,962 ) Net of tax Amounts shown above in parentheses reduce earnings

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the computation of basic and diluted net income per common share for the years indicated (in thousands, except per share data) : Year Ended December 31, 2019 2018 2017 Net income $ 185,721 $ 166,111 $ 67,821 Dividends and undistributed earnings allocated to unvested shares (1,375 ) (1,184 ) (571 ) Net income available to common stockholders $ 184,346 $ 164,927 $ 67,250 Income per common share: Basic $ 2.31 $ 2.07 $ 0.92 Diluted 2.31 2.07 0.92 Weighted average common shares: Basic 79,700 79,662 73,247 Effect of dilutive securities: Stock options 1 7 12 Restricted stock units 7 2 — Diluted 79,708 79,671 73,259 At December 31, 2019 , United had the following potentially dilutive instruments outstanding: 1,000 shares of common stock issuable upon exercise of stock options with a weighted average exercise price of $30.45 and 183,168 shares of common stock issuable upon vesting of restricted stock unit awards. At December 31, 2018 , United excluded 32,316 potentially dilutive shares of common stock issuable upon exercise of stock options because of their antidilutive effect. At December 31, 2017 , United had the following potentially dilutive instruments outstanding: a warrant to purchase 219,909 shares of common stock at $61.40 per share; 60,287 shares of common stock issuable upon exercise of stock options; and 663,817 shares of common stock issuable upon completion of vesting of restricted stock unit awards.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense is as follows for the years indicated (in thousands) : Year Ended December 31, 2019 2018 2017 Current $ 38,082 $ 17,185 $ 5,451 Deferred 14,909 32,630 60,951 Increase in valuation allowance — — 413 Expense due to enactment of federal tax reform — — 38,198 Total income tax expense $ 52,991 $ 49,815 $ 105,013 The differences between the provision for income taxes and the amount computed by applying the statutory federal income tax rate of 21% in 2019 and 2018 and 35% in 2017 to income before income taxes are as follows for the years indicated (in thousands) : Year Ended December 31, 2019 2018 2017 Pretax income at statutory rates $ 50,130 $ 45,344 $ 60,492 Add (deduct): State taxes, net of federal benefit 7,168 6,765 4,139 Bank owned life insurance earnings (1,127 ) (747 ) (1,141 ) Adjustment to reserve for uncertain tax positions 84 80 59 Tax-exempt interest revenue (1,827 ) (1,229 ) (1,199 ) Equity compensation (375 ) (892 ) (799 ) Transaction costs 16 78 408 Tax credit investments (464 ) (29 ) (89 ) Change in state statutory tax rate — 583 81 Increase in valuation allowance — — 413 Release of disproportionate tax effects related to de-designated cash flow hedges — — 3,400 Expense due to enactment of federal tax reform — — 38,198 Other (614 ) (138 ) 1,051 Total income tax expense $ 52,991 $ 49,815 $ 105,013 On December 22, 2017, H.R.1, commonly known as the Tax Cuts and Jobs Act of 2017 (the “Tax Act”) was signed into law. Among other things, the Tax Act reduced United’s corporate federal tax rate from 35% to 21% effective January 1, 2018. As a result, United was required to re-measure, through 2017 income tax expense, its deferred tax assets and liabilities using the enacted rate at which United expects them to be recovered or settled. Also, on December 22, 2017 , the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provided guidance on accounting for the tax effects of the Tax Act. SAB118 provided a one-year measurement period from the Tax Act enactment date for companies to complete the related accounting under ASC Topic 740, Income Taxes (“ASC 740”). United’s 2017 financial results reflected both the income tax effects of the Tax Act for which the accounting was complete and provisional amounts for certain income tax effects of the Tax Act for which the accounting was incomplete, but a reasonable estimate could be determined. In 2017, United recorded a provisional amount of income tax expense of $38.2 million for the impact of the re-measurement of its deferred tax asset. No material adjustments to the provisional amount were recorded during the one-year measurement period. The following summarizes the sources and expected tax consequences of future taxable deductions (revenue) which comprise the net deferred tax asset as of the dates indicated (in thousands) : December 31, 2019 2018 Deferred tax assets: Allowance for loan losses $ 14,910 $ 14,604 Net operating loss carryforwards 27,568 39,204 Deferred compensation 9,363 8,535 Loan purchase accounting adjustments 6,599 8,658 Reserve for losses on foreclosed properties 20 61 Nonqualified share based compensation 2,041 1,190 Accrued expenses 3,958 3,536 Investment in partnerships 67 426 Unamortized pension actuarial losses and prior service cost 1,739 1,606 Unrealized losses on securities available-for-sale — 8,092 Unrealized losses on cash flow hedges — 86 Lease liability 5,327 — Other 2,038 1,235 Total deferred tax assets 73,630 87,233 Deferred tax liabilities: Unrealized gains on securities available-for-sale 7,943 — Acquired intangible assets 2,530 2,772 Premises and equipment 3,002 1,291 Loan origination costs 3,538 3,734 True tax leases 7,783 6,020 Prepaid expenses 373 398 Servicing assets 4,428 2,862 Derivatives 1,075 525 Right-of-use asset 4,809 — Uncertain tax positions 1,792 2,036 Total deferred tax liabilities 37,273 19,638 Less valuation allowance 2,298 3,371 Net deferred tax asset $ 34,059 $ 64,224 The change in the net deferred tax asset includes an increase of $203,000 due to current year merger and acquisition activity and the adoption of Topic 842. At December 31, 2019 , United had state net operating loss carryforwards of approximately $10.5 million that begin to expire in 2021 , $3.71 million that begin to expire in 2027 and $197 million that begin to expire in 2031, if not previously utilized. United had $74.6 million in federal net operating loss carryforwards subject to annual limitation under IRC Section 382 that begin to expire in 2027, if not previously utilized. United had $4.33 million of state tax credits that begin to expire in 2025 , if not previously utilized. Management assesses the valuation allowance recorded against deferred tax assets at each reporting period. The determination of whether a valuation allowance for deferred tax assets is appropriate is subject to considerable judgment and requires an evaluation of all the positive and negative evidence. ASC 740 requires that companies assess whether a valuation allowance should be established against their deferred tax assets based on the consideration of all available evidence using a “more likely than not” standard. At December 31, 2019 and 2018 , based on the assessment of all the positive and negative evidence, management concluded that it is more likely than not that nearly all of the net deferred tax asset will be realized based upon future taxable income. The valuation allowance of $2.30 million and $3.37 million , respectively, was related to specific state income tax credits that have short carryforward periods and certain acquired state net operating losses, both of which are expected to expire unused. The valuation allowance could fluctuate in future periods based on the assessment of the positive and negative evidence. Management’s conclusion at December 31, 2019 that it was more likely than not that the net deferred tax asset of $34.1 million will be realized is based on management’s estimate of future taxable income. Management’s estimate of future taxable income is based on internal forecasts which consider historical performance, various internal estimates and assumptions, as well as certain external data all of which management believes to be reasonable although inherently subject to significant judgment. If actual results differ significantly from the current estimates of future taxable income, even if caused by adverse macro-economic conditions, the valuation allowance may need to be increased for some or all of the deferred tax asset. A reconciliation of the beginning and ending unrecognized tax benefit related to uncertain tax positions is as follows for the years indicated (in thousands) : 2019 2018 2017 Balance at beginning of year $ 3,264 $ 3,163 $ 3,892 Additions based on tax positions related to the current year 481 470 441 Decreases resulting from a lapse in the applicable statute of limitations (375 ) (369 ) (351 ) Remeasurement due to enactment of federal tax reform — — (819 ) Balance at end of year $ 3,370 $ 3,264 $ 3,163 Approximately $2.92 million of the unrecognized tax benefit at December 31, 2019 would increase income from continuing operations, and thus affect United’s effective tax rate, if ultimately recognized into income. It is United’s policy to recognize interest and penalties accrued relative to unrecognized tax benefits in their respective federal or state income taxes accounts. There were no penalties and interest related to income taxes recorded in the income statement in 2019 , 2018 or 2017 . No amounts were accrued for interest and penalties on the balance sheet at December 31, 2019 or 2018 . United and its subsidiaries file a consolidated U.S. federal income tax return, as well as various state returns in the states where it operates. United’s federal and state income tax returns are no longer subject to examination by taxing authorities for years before 2016 .

Pension and Employee Benefit Pl

Pension and Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Pension and Employee Benefit Plans	Pension and Employee Benefit Plans United offers a defined contribution 401(k) plan (the “401(k) Plan”) that covers substantially all employees meeting certain minimum service requirements. The 401(k) Plan allows employees to make pre-tax contributions to the 401(k) Plan and, prior to March 1, 2018, United matched 70% of employee contributions up to 5% of eligible compensation. The matching contribution was increased to 100% of employee contributions up to 5% of eligible compensation effective March 1, 2018. Employees begin to receive matching contributions after completing one year of service and benefits vest after three years of service. United’s 401(k) Plan is administered in accordance with applicable laws and regulations. Compensation expense from continuing operations related to the 401(k) Plan totaled $5.30 million , $4.73 million and $2.66 million in 2019 , 2018 and 2017 , respectively. The 401(k) Plan allows employees to choose to invest among a number of investment options that previously included United’s common stock. Effective January 1, 2015, United’s common stock was no longer offered as an investment option for new contributions. United sponsors a non-qualified deferred compensation plan for its executive officers, certain other key employees and members of United’s Board of Directors and its community banks’ advisory boards of directors. The deferred compensation plan provides for the pre-tax deferral of compensation, fees and other specified benefits. The deferred compensation plan also permits each employee participant to elect to defer a portion of his or her base salary, bonus or vested restricted stock units and permits each eligible director participant to elect to defer all or a portion of his or her director’s fees. Further, the deferred compensation plan allows for additional contributions by an employee, with matching contributions by United, for amounts that exceed the allowable amounts under the 401(k) Plan. During 2019 , 2018 and 2017 , United recognized $162,000 , $119,000 and $35,000 , respectively, in matching contributions for this provision of the deferred compensation plan. The Board of Directors may also elect to make a discretionary contribution to any or all participants. No discretionary contributions were made in 2019 , 2018 or 2017 . Defined Benefit Pension Plans United has an unfunded noncontributory defined benefit pension plan (“Modified Retirement Plan”) that covers certain executive officers and other key employees. The Modified Retirement Plan provides a fixed annual retirement benefit to plan participants. United acquired Palmetto Bancshares, Inc. (“Palmetto”) on September 1, 2015, including its funded noncontributory defined benefit pension plan (“Funded Plan”), which covered all full-time Palmetto employees who had fulfilled at least 12 months of continuous service and attained age 21 by December 31, 2007. Benefits under the Funded Plan were no longer accrued for service subsequent to 2007. On December 28, 2018 , United filed a Notice of Standard Termination with the Pension Benefit Guaranty Corporation in accordance with regulatory requirements. During 2019, United settled the liabilities of its Funded Plan. Participants elected to receive either lump sum distributions or annuity contracts purchased from a third-party insurance company that provided for the payment of vested benefits. United contributed $4.90 million to the Funded Plan in the third quarter 2019 to fund its liquidation. As a result of the pension termination, unrecognized losses of $1.56 million , which were previously recorded in accumulated other comprehensive income (loss) on the consolidated balance sheets, were recognized as expense and an additional pension plan settlement loss of $1.38 million was recorded in the consolidated statements of income. Including both charges, the total Funded Plan settlement loss was $2.94 million , which was included in merger-related and other charges for the year ended December 31, 2019. Weighted-average assumptions used to determine pension benefit obligations at year end and net periodic pension cost are shown in the table below: 2019 2018 Modified Retirement Plan Modified Retirement Plan Funded Plan Discount rate for disclosures 3.25 % 4.40 % Various Discount rate for net periodic benefit cost 4.40 % 3.75 % 3.75 % Expected long-term rate of return N/A N/A 4.00 % Rate of compensation increase N/A N/A N/A Measurement date 12/31/2019 12/31/2018 12/31/2018 The Modified Retirement Plan discount rates are determined in consultation with the third-party actuary and are set by matching the projected benefit cash flow to a notional yield curve developed by reference to high-quality fixed income investments. The discount rates are determined as the rate which would provide the same present value as the plan cash flows discounted to the measurement date using the full series of spot rates along the notional yield curve as of the measurement date. This process was also utilized when determining the Funded Plan discount rate for net periodic benefit cost. Because plan termination of the Funded Plan was imminent when determining the 2018 discount rate for disclosures, assumptions were utilized that were consistent with those to be used with regard to plan termination. For retirees, a discount rate of 3.6% was determined based on the third-party actuary’s recent experience with group annuities from insurance companies. For non-retirees, the assumption was that all participants would elect a lump-sum payment and, as a result, the IRS assumptions for lump-sum payments were utilized (discount rate of 3.33% for payments in first five years , 4.39% for payments during next 15 years and 4.72% for payments beyond 20 years ). The expected long-term rate of return was designed to approximate the actual long-term rate of return over time. Therefore, the pattern of income / expense recognition should match the stable pattern of services provided by employees over the life of the pension obligation. Expected returns on plan assets were developed in conjunction with input from external advisors and took into account the investment policy, actual investment allocation, long-term expected rates of return on the relevant asset classes and considered any material forward-looking return expectations for these major asset classes. United recognizes the underfunded status of the plans as a liability in the consolidated balance sheets. Information about changes in obligations and plan assets follows (in thousands) : 2019 2018 Modified Retirement Plan Funded Plan Modified Retirement Plan Funded Plan Accumulated benefit obligation: Accumulated benefit obligation - beginning of year $ 21,736 $ 16,011 $ 21,705 $ 17,700 Service cost 392 — 363 — Interest cost 931 166 801 647 Plan amendments 386 — 412 — Actuarial (gains) losses 2,390 1,489 (949 ) (839 ) Benefits paid (730 ) (17,666 ) (596 ) (1,497 ) Accumulated benefit obligation - end of year 25,105 — 21,736 16,011 Change in plan assets, at fair value: Beginning plan assets — 12,595 — 14,308 Actual return — 173 — (216 ) Employer contribution 730 4,898 596 — Benefits paid (730 ) (17,666 ) (596 ) (1,497 ) Plan assets - end of year — — — 12,595 Funded status - end of year (plan assets less benefit obligations) $ (25,105 ) $ — $ (21,736 ) $ (3,416 ) Components of net periodic benefit cost and other amounts recognized in other comprehensive income are as follows (in thousands): 2019 2018 2017 Modified Retirement Plan Funded Plan Modified Retirement Plan Funded Plan Modified Retirement Plan Funded Plan Service cost $ 392 $ — $ 363 $ — $ 551 $ — Interest cost 931 166 801 647 778 738 Expected return on plan assets — (106 ) — (551 ) — (630 ) Amortization of prior service cost 635 — 666 — 560 — Amortization of net losses 59 — 241 — 238 — Net periodic benefit cost $ 2,017 $ 60 $ 2,071 $ 96 $ 2,127 $ 108 The estimated net loss and prior service costs for the Modified Retirement Plan that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year are $326,000 and $531,000 , respectively, as of December 31, 2019 . The following table summarizes the estimated future benefit payments expected to be paid from the Modified Retirement Plan for the periods indicated (in thousands) . 2020 $ 1,301 2021 1,176 2022 1,170 2023 1,164 2024 1,156 2025-2029 7,133 The following table summarizes the Funded Plan assets by major category as of the December 31, 2018, aggregated by the level in the fair value hierarchy within which those measurements fall (in thousands) . Level 1 Level 2 Level 3 Total Money market fund $ — $ 1,033 $ — $ 1,033 Mutual funds 4,881 — — 4,881 Corporate stocks 4,465 — — 4,465 Exchange traded funds 2,216 — — 2,216 Total plan assets $ 11,562 $ 1,033 $ — $ 12,595 For fair value measurement, money market funds were valued at amortized cost, which approximates fair value. Mutual funds, U.S. treasuries, corporate stocks, and exchange traded funds were valued at the closing price reported in the active market in which the instrument is traded. See Note 24 for more details regarding fair value measurements and the fair value hierarchy. The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, although management believes the valuation methods were appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

Derivatives and Hedging Activit

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities Risk Management Objective of Using Derivatives United is exposed to certain risks arising from both its business operations and economic conditions. United principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. United manages interest rate risk through a combination of pricing and term structure of deposit product offerings, the amount and duration of its investment securities portfolio and wholesale funding and, to a lesser degree, through the use of derivative financial instruments. From time to time, United enters into derivative financial instruments to manage interest rate risk exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. Derivative financial instruments are used to manage differences in the amount, timing, and duration of known or expected cash receipts and known or expected cash payments principally related to loans, investment securities, wholesale borrowings and deposits. In conjunction with the FASB’s fair value measurement guidance, United made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting arrangements on a gross basis. United clears certain derivatives centrally through the Chicago Mercantile Exchange (“CME”). CME rules legally characterize variation margin payments for centrally cleared derivatives as settlements of the derivatives’ exposure rather than as collateral. As a result, the variation margin payment and the related derivative instruments are considered a single unit of account for accounting purposes. Variation margin, as determined by the CME, is settled daily. As a result, derivative contracts that clear through the CME have an estimated fair value of zero. The table below presents the fair value of derivative financial instruments as of the dates indicated as well as their classification on the consolidated balance sheets (in thousands) : Derivatives designated as hedging instruments December 31, Interest Rate Products Balance Sheet Location 2019 2018 Fair value hedge of brokered CDs Derivative liabilities $ 880 $ 1,682 $ 880 $ 1,682 Derivatives not designated as hedging instruments December 31, Interest Rate Products Balance Sheet Location 2019 2018 Customer derivative positions Derivative assets $ 27,277 $ 5,216 Dealer offsets to customer derivative positions Derivative assets 394 7,620 Mortgage banking - loan commitment Derivative assets 1,970 1,190 Mortgage banking - forward sales commitment Derivative assets 98 28 Bifurcated embedded derivatives Derivative assets 5,268 10,651 $ 35,007 $ 24,705 Customer derivative positions Derivative liabilities $ 446 $ 9,661 Dealer offsets to customer derivative positions Derivative liabilities 6,425 781 Risk participations Derivative liabilities 12 8 Mortgage banking - forward sales commitment Derivative liabilities 86 259 Dealer offsets to bifurcated embedded derivatives Derivative liabilities 7,667 13,339 De-designated hedges Derivative liabilities — 703 $ 14,636 $ 24,751 Customer derivative positions are between United and certain commercial loan customers with offsetting positions to dealers under a back-to-back swap/cap program. In addition, to accommodate customers, United occasionally enters into credit risk participation agreements with counterparty banks to accept a portion of the credit risk related to interest rate swaps. The agreements, which are typically executed in conjunction with a participation in a loan with the same customer, allow customers to execute an interest rate swap with one bank while allowing for the distribution of the credit risk among participating members. Collateral used to support the credit risk for the underlying lending relationship is also available to offset the risk of credit risk participations and customer derivative positions. United also has three interest rate swap contracts that are not designated as hedging instruments but are economic hedges of market-linked brokered certificates of deposit. The market-linked brokered certificates of deposit contain embedded derivatives that are bifurcated from the host instruments and marked to market through earnings. The fair value marks on the market linked swaps and the bifurcated embedded derivatives tend to move in opposite directions with changes in 90 -day LIBOR and therefore provide an economic hedge. In addition, United originates certain residential mortgage loans with the intention of selling these loans. Between the time United enters into an interest-rate lock commitment to originate a residential mortgage loan that is to be held for sale and the time the loan is funded and eventually sold, United is subject to the risk of variability in market prices. United also enters into forward sale agreements to mitigate risk and to protect the expected gain on the eventual loan sale. The commitments to originate residential mortgage loans and forward loan sales commitments are freestanding derivative instruments. United accounts for most newly originated mortgage loans at fair value pursuant to the fair value option, and these loans are not reflected in the table above. Fair value adjustments on these derivative instruments are recorded within mortgage loan and other related fee income in the consolidated statements of income. Cash Flow Hedges of Interest Rate Risk At December 31, 2019 and 2018 , United did not have any active cash flow hedges. Changes in balance sheet composition and interest rate risk position made cash flow hedges not currently necessary as protection against rising interest rates. The loss remaining in other comprehensive income from prior hedges that had previously been de-designated was being amortized into earnings over the original term of the swaps as the forecasted transactions that the swaps were originally designated to hedge were still expected to occur. This was the only effect of cash flow hedges on the consolidated statements of income for the years ended December 31, 2019 , 2018 and 2017 . During the second quarter of 2019, United amortized the remaining balance of losses on terminated hedging positions from other comprehensive income. See Note 15 for further detail. Fair Value Hedges of Interest Rate Risk United is exposed to changes in the fair value of certain of its fixed-rate obligations due to changes in interest rates. United uses interest rate swaps to manage its exposure to changes in fair value on these instruments attributable to changes in interest rates. For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in earnings. United includes the gain or loss on the hedged items in the same income statement line item as the offsetting loss or gain on the related derivatives. At December 31, 2019 and 2018 , United had four interest rate swaps with an aggregate notional amount of $37.9 million and $39.0 million , respectively, that were designated as fair value hedges of fixed-rate brokered time deposits. The swaps involved the receipt of fixed-rate amounts from a counterparty in exchange for United making variable rate payments over the life of the agreements. During 2017 and through the first quarter of 2018, United also had receive-variable / pay-fixed interest rate swaps designated as fair value hedges of fixed-rate investments. The table below presents the effect of derivatives in fair value hedging relationships on the consolidated statements of income (in thousands) . Year Ended December 31, 2019 2018 2017 Interest expense - deposits Interest expense - deposits Interest revenue - taxable investment securities Other noninterest income Interest expense - deposits Interest revenue - taxable investment securities Total amounts presented in the $ 66,856 $ 39,543 $ 73,496 $ 24,142 $ 17,062 $ 70,172 Gains (losses) on fair value hedging Interest rate contracts: Amounts related to interest settlements (327 ) (245 ) 17 — 160 (302 ) Recognized on derivatives 733 (220 ) — 356 (657 ) 72 Recognized on hedged items (766 ) (145 ) — (447 ) 371 (265 ) Net income (expense) recognized on fair $ (360 ) $ (610 ) $ 17 $ (91 ) $ (126 ) $ (495 ) In certain cases, the estate of deceased brokered certificate of deposit holders may put the certificate of deposit back to United at par upon the death of the holder. When these estate puts occur, a gain or loss is recognized for the difference between the fair value and the par amount of the deposits put back. The change in the fair value of brokered time deposits that are being hedged in fair value hedging relationships reported in the table above includes gains and losses from estate puts. The table below presents the carrying amount of hedged fixed-rate brokered time deposits and cumulative fair value hedging adjustments included in the carrying amount of the hedged liability for the periods presented (in thousands) . December 31, 2019 2018 Balance Sheet Location Carrying amount of Assets (Liabilities) Hedge Accounting Basis Adjustment Carrying amount of Assets (Liabilities) Hedge Accounting Basis Adjustment Deposits $ (35,880 ) $ 645 $ (35,776 ) $ 1,838 Derivatives Not Designated as Hedging Instruments The table below presents the gains and losses recognized in income on derivatives not designated as hedging instruments for the periods indicated (in thousands) . Income Statement Location Year Ended December 31, 2019 2018 2017 Customer derivatives and dealer offsets Other noninterest income $ 2,878 $ 2,658 $ 2,416 Bifurcated embedded derivatives and dealer offsets Other noninterest income 212 307 429 Interest rate caps Other noninterest income — 501 252 De-designated hedges Other noninterest income (193 ) 31 (62 ) Mortgage banking derivatives Mortgage loan revenue (1,797 ) 904 (676 ) Risk participations Other noninterest income (3 ) 12 5 Total gains and losses $ 1,097 $ 4,413 $ 2,364 Credit-risk-related Contingent Features United manages its credit exposure on derivatives transactions by entering into a bilateral credit support agreement with each non-customer counterparty. The credit support agreements require collateralization of exposures beyond specified minimum threshold amounts. The details of these agreements, including the minimum thresholds, vary by counterparty. As of December 31, 2019 , collateral totaling $14.9 million was pledged toward derivatives in a liability position. United’s agreements with each of its derivative counterparties contain a provision where if either party defaults on any of its indebtedness, then it could also be declared in default on its derivative obligations. The agreements with derivatives counterparties also include provisions that if not met, could result in United being declared in default. United has agreements with certain of its derivative counterparties that provide that if United fails to maintain its status as a well-capitalized institution or is subject to a prompt corrective action directive, the counterparty could terminate the derivative positions and United would be required to settle its obligations under the agreements. Derivatives that are centrally cleared do not have credit-risk-related features that require additional collateral if United’s credit rating were downgraded.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Matters	Regulatory Matters Capital Requirements United and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary action by regulators that, if undertaken, could have a direct material effect on United. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, United and the Bank must meet specific capital guidelines that involve quantitative measures of the Bank’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Quantitative measures (as defined) established by regulation to ensure capital adequacy require United and the Bank to maintain minimum amounts and ratios of total capital, Tier 1 capital, and common equity Tier 1 capital (“CET1”) to risk-weighted assets, and of Tier 1 capital to average assets. United and the Bank are also subject to a “capital conservation buffer,” which is designed to absorb losses during periods of economic stress. Banking organizations with a ratio of CET1 to risk-weighted assets above the minimum but below the conservation buffer (or below the combined capital conservation buffer and countercyclical capital buffer, when the latter is applied) will face constraints on dividends, equity repurchases and discretionary bonus compensation based on the amount of the shortfall. As of December 31, 2019 , United and the Bank were categorized as well-capitalized under the regulatory framework for prompt corrective action in effect at such time. To be categorized as well-capitalized at December 31, 2019 , United and the Bank must have exceeded the well-capitalized guideline ratios in effect at such time, as set forth in the table below and have met certain other requirements. Management believes that United and the Bank exceeded all well-capitalized requirements at December 31, 2019 , and there have been no conditions or events since year-end that would change the status of well-capitalized. Regulatory capital ratios at December 31, 2019 and 2018 , along with the minimum amounts required for capital adequacy purposes and to be well-capitalized under prompt corrective action provisions in effect at such times are presented below for United and the Bank (dollars in thousands) : Basel III Guidelines United Community Banks, Inc. (consolidated) United Community Bank Minimum (1) Well Capitalized 2019 2018 2019 2018 Risk-based ratios: Common equity tier 1 capital 4.5 % 6.5 % 12.97 % 12.16 % 14.87 % 12.91 % Tier 1 capital 6.0 8.0 13.21 12.42 14.87 12.91 Total capital 8.0 10.0 15.01 14.29 15.54 13.60 Tier 1 leverage ratio 4.0 5.0 10.34 9.61 11.63 9.98 Common equity tier 1 capital $ 1,275,148 $ 1,148,355 $ 1,458,720 $ 1,216,449 Tier 1 capital 1,299,398 1,172,605 1,458,720 1,216,449 Total capital 1,476,302 1,348,843 1,524,267 1,281,062 Risk-weighted assets 9,834,051 9,441,622 9,810,477 9,421,009 Average total assets 12,568,563 12,207,986 12,545,254 12,183,341 (1) As of December 31, 2019 and 2018 the additional capital conservation buffer in effect was 2.50% and 1.87% Cash, Dividend, Loan and Other Restrictions At December 31, 2019 and 2018 , the Bank did not have a required reserve balance at the Federal Reserve Bank of Atlanta. Federal and state banking regulations place certain restrictions on dividends paid by the Bank to the Holding Company. During 2018 , the Bank received regulatory approval to pay cash dividends to the Holding Company of $162 million . No cash dividends were paid by the Bank to the Holding Company in 2019. The Federal Reserve Act requires that extensions of credit by the Bank to certain affiliates, including the Holding Company, be secured by specific collateral, that the extension of credit to any one affiliate be limited to 10% of capital and surplus (as defined), and that extensions of credit to all such affiliates be limited to 20% of capital and surplus. The Bank is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of their customers. These financial instruments include commitments to extend credit and letters of credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated balance sheets. The contract amounts of these instruments reflect the extent of involvement the Bank has in particular classes of financial instruments. The exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and letters of credit written is represented by the contractual amount of these instruments. United uses the same credit policies in making commitments and conditional obligations as it uses for underwriting on-balance sheet instruments. In most cases, collateral or other security is required to support financial instruments with credit risk.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The following table summarizes, as of the dates indicated, the contract amount of off-balance sheet instruments (in thousands) : December 31, 2019 2018 Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 2,126,275 $ 2,129,463 Letters of credit 22,533 25,447 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments may expire without being drawn on, the total commitment amounts do not necessarily represent future cash requirements. United evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary, upon extension of credit is based on management’s credit evaluation. Collateral held varies, but may include unimproved and improved real estate, certificates of deposit, personal property or other acceptable collateral. Letters of credit are conditional commitments issued by United and could result in the commitment being drawn on when the underlying transaction is consummated between the customer and the third party or upon the non-performance of the customer. Those guarantees are primarily issued to local businesses and government agencies. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. In most cases, the Bank holds real estate, certificates of deposit, and other acceptable collateral as security supporting those commitments for which collateral is deemed necessary. The extent of collateral held for those commitments varies. United maintains an allowance for unfunded loan commitments which is included in the balance of other liabilities in the consolidated balance sheets. The allowance for unfunded loan commitments is determined as part of the quarterly analysis of the allowance for credit losses and is based on probable incurred losses in unfunded loan commitments that are expected to result in funded loans. The Bank holds minor investments in certain limited partnerships for CRA purposes. As of December 31, 2019 , the Bank had a recorded investment of $34.8 million in these limited partnerships and had committed to fund an additional $5.72 million related to future capital calls that has not been reflected in the consolidated balance sheet. United, in the normal course of business, is subject to various pending and threatened lawsuits in which claims for monetary damages are asserted. Although it is not possible to predict the outcome of these lawsuits, or the range of any possible loss, management, after consultation with legal counsel, does not anticipate that the ultimate aggregate liability, if any, arising from these lawsuits will have a material adverse effect on financial position or results of operations.

Common and Preferred Stock

Common and Preferred Stock	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Common and Preferred Stock	Common and Preferred Stock In November of 2019, United’s Board of Directors authorized an update to the existing common stock repurchase plan to authorize the repurchase of its common stock up to $50 million . The program is scheduled to expire on the earlier of United’s repurchase of its common stock having an aggregate purchase price of $50 million or December 31, 2020. Under the program, shares may be repurchased in open market transactions or in privately negotiated transactions, from time to time, subject to market conditions. During 2019 , 500,495 shares were repurchased under the program. During 2018 , no shares were repurchased under the program. As of December 31, 2019 , United had remaining authorization to repurchase up to $50.0 million of outstanding common stock under the program. United may issue preferred stock in one or more series, up to a maximum of 10,000,000 shares. Each series shall include the number of shares issued, preferences, special rights and limitations as determined by the Board of Directors. United had no preferred stock outstanding as of December 31, 2019 or 2018 .

Equity Compensation and Related

Equity Compensation and Related Plans	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Equity Compensation and Related Plans	Equity Compensation and Related Plans United has an equity compensation plan that allows for grants of various share-based compensation. Options granted under the plan can have an exercise price no less than the fair market value of the underlying stock at the date of grant. The general terms of the plan include a vesting period (usually four years ) with an exercisable period not to exceed ten years . Certain options and restricted stock unit awards provide for accelerated vesting if there is a change in control of United or certain other conditions are met (as defined in the plan document). As of December 31, 2019 , 1.32 million additional awards could be granted under the plan. Restricted stock units and options outstanding and activity for the years ended December 31 consisted of the following: Restricted Stock Units Options Shares Weighted Average Grant Date Fair Value Aggregate Intrinsic Value (000’s) Shares Weighted Average Exercise Price Weighted Average Remaining Term (Yrs.) Aggregate Intrinsic Value (000’s) December 31, 2016 690,970 $ 18.60 72,665 $ 34.34 Granted 270,339 26.50 — — Vested (284,662 ) 17.48 — — Expired — — (1,538 ) 147.60 Cancelled (12,830 ) 19.91 (10,840 ) 75.08 December 31, 2017 663,817 22.40 60,287 24.12 Granted 416,484 30.54 — — Vested / Exercised (290,013 ) 20.18 (12,000 ) 11.85 Cancelled (30,542 ) 23.65 (1,148 ) 31.50 December 31, 2018 759,746 27.66 47,139 27.07 Granted 315,827 26.74 — — Vested / Exercised (216,138 ) 25.38 $ 6,004 (13,000 ) 16.34 Expired — (30,243 ) 31.43 Cancelled (51,011 ) 27.18 (2,396 ) 29.68 December 31, 2019 808,424 27.94 24,964 1,500 27.95 0.27 $ 4 Vested / Exercisable at December 31, 2019 — — 1,500 27.95 0.27 4 The following is a summary of stock options outstanding at December 31, 2019 : Options Outstanding Options Exercisable Shares Range Weighted Average Price Average Remaining Life Shares Weighted Average Price 500 20.00 - 25.00 $ 22.95 0.22 500 $ 22.95 1,000 30.01 - 30.45 30.45 0.29 1,000 30.45 1,500 20.00 - 30.45 27.95 0.27 1,500 27.95 No compensation expense relating to options was included in earnings for 2019 . Compensation expense relating to options of $18,000 and $28,000 , respectively, was included in earnings for 2018 and 2017 . The amount of compensation expense for all periods was determined based on the fair value of options at the time of grant, multiplied by the number of options granted that were expected to vest, which was then amortized over the vesting period. Compensation expense for restricted stock units without market conditions is based on the market value of United’s common stock on the date of grant. United recognizes the impact of forfeitures as they occur. The value of restricted stock unit awards is amortized into expense over the service period. Compensation expense recognized in the consolidated statements of income for employee restricted stock unit awards in 2019 , 2018 and 2017 was $8.98 million , $5.69 million and $5.51 million , respectively. Of the expense related to restricted stock unit awards during the twelve months ended December 31, 2019 , $1.38 million related to the modification of existing awards resulting from an acceleration of vesting of awards due to retirement and $740,000 related to awards granted in conjunction with an acquisition, both of which were recognized in merger-related and other charges in the consolidated statement of income. The remaining expense of $6.86 million was recognized in salaries and employee benefits expense, as was the entire amount for 2018 . Of the expense recognized related to restricted stock unit awards during 2017 , $696,000 related to the modification of existing awards resulting from an acceleration of vesting of unvested awards due to retirement, which was recognized in merger-related and other charges. The remaining expense of $4.82 million was recognized in compensation expense. In addition, in 2019 , 2018 , and 2017 , $379,000 , $338,000 and $287,000 , respectively, was recognized in other operating expenses for restricted stock unit awards granted to members of United’s board of directors. During 2019 and 2018, in addition to time-based restricted stock unit awards, United’s Board of Directors approved performance-based restricted stock unit awards with market conditions (“PSUs”). The PSUs will vest based on achieving, during the applicable calendar-year performance periods, certain performance and market targets relative to a bank peer group. Achievement of the base-level performance and market targets for all applicable periods will result in the issuance of 96,910 shares, which are included in the outstanding balance in the table above. Additional shares may be issued if more stringent performance and market hurdles are met. The grant date per share fair market value of these PSUs was estimated using the Monte Carlo Simulation valuation model. A deferred income tax benefit related to compensation expense for options and restricted stock units of $2.39 million , $1.54 million and $2.27 million was included in the determination of income tax expense in 2019 , 2018 and 2017 , respectively. As of December 31, 2019 , there was $14.8 million of unrecognized compensation cost related to nonvested stock options and restricted stock units granted under the plan. The cost is expected to be recognized over a weighted-average period of 2.5 years . United sponsors a Dividend Reinvestment and Stock Purchase Plan (“DRIP”) that allows participants who already own United’s common stock to purchase additional shares directly from the Company. The DRIP also allows participants to automatically reinvest their quarterly dividends in additional shares of common stock without a commission. In 2019 , 2018 and 2017 , 62,629 , 7,307 and 4,404 shares, respectively, were issued under the DRIP. United has an Employee Stock Purchase Program (“ESPP”) that allows eligible employees to purchase shares of common stock at a discount ( 10% ), with no commission charges. During 2019 , 2018 and 2017 United issued 20,928 , 17,941 shares and 13,422 shares, respectively, through the ESPP. United offers its common stock as an investment option in its deferred compensation plan. The common stock component is accounted for as an equity instrument and is reflected in the consolidated balance sheets as common stock issuable. The deferred compensation plan does not allow for diversification once an election is made to invest in United stock and settlement must be accomplished in shares at the time the deferral period is completed. United also allows restricted stock unit grantees to defer all or a portion of their awards into the deferred compensation plan upon vesting. At December 31, 2019 and 2018 , United had 664,640 shares and 674,499 shares, respectively, of its common stock that was issuable under the deferred compensation plan.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Fair value measurements are determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, United uses a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity’s own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). United has processes in place to review the significant valuation inputs and to reassess how the instruments are classified in the valuation framework. Fair Value Hierarchy Level 1 Valuation is based upon quoted prices (unadjusted) in active markets for identical assets or liabilities that United has the ability to access. Level 2 Valuation is based upon quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. Level 3 Valuation is generated from model-based techniques that use at least one significant assumption based on unobservable inputs for the asset or liability, which are typically based on an entity’s own assumptions, as there is little, if any, related market activity. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the entire fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety. United’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the asset or liability. The following is a description of the valuation methodologies used for assets and liabilities recorded at fair value. Investment Securities Debt securities available-for-sale and equity securities with readily determinable fair values are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted prices, if available. If quoted prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss assumptions. Level 1 securities include those traded on an active exchange, such as the New York Stock Exchange, U.S. Treasury securities that are traded by dealers or brokers in active over-the-counter markets and money market funds. Level 2 securities include mortgage-backed securities issued by government sponsored entities, municipal bonds, corporate debt securities and asset-backed securities and are valued based on observable inputs that include: quoted market prices for similar assets, quoted market prices that are not in an active market, or other inputs that are observable in the market and can be corroborated by observable market data for substantially the full term of the securities. Securities classified as Level 3 include those traded in less liquid markets and are valued based on estimates obtained from broker-dealers that are not directly observable. Deferred Compensation Plan Assets and Liabilities Included in other assets in the consolidated balance sheets are assets related to employee deferred compensation plans. The assets associated with these plans are invested in mutual funds and classified as Level 1. Deferred compensation liabilities, also classified as Level 1, are carried at the fair value of the obligation to the employee, which mirrors the fair value of the invested assets and is included in other liabilities in the consolidated balance sheets. Mortgage Loans Held for Sale United has elected the fair value option for newly originated mortgage loans held for sale in order to reduce certain timing differences and better match changes in fair values of the loans with changes in the value of derivative instruments used to economically hedge them. The fair value of mortgage loans held for sale is determined using quoted prices for a similar asset, adjusted for specific attributes of that loan (Level 2). Derivative Financial Instruments United uses interest rate swaps and interest rate floors to manage its interest rate risk. The valuation of these instruments is typically determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts and the discounted expected variable cash payments. The variable cash payments are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. United also uses best effort and mandatory delivery forward loan sale commitments to hedge risk in its mortgage lending business. To comply with the provisions of ASC 820, management incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, management has considered the effect of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although management has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of December 31, 2019 , management had assessed the significance of the effect of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. Derivatives classified as Level 3 included structured derivatives for which broker quotes, used as a key valuation input, were not observable consistent with a Level 2 disclosure. The fair value of risk participations incorporates Level 3 inputs to evaluate the likelihood of customer default. The fair value of interest rate lock commitments, which is related to mortgage loan commitments, is categorized as Level 3 based on unobservable inputs for commitments that United does not expect to fund. Servicing Rights for Residential Mortgage and SBA/USDA Loans United recognizes servicing rights upon the sale of residential mortgage and SBA/USDA loans sold with servicing retained. Management has elected to carry these assets at fair value. Given the nature of the assets, the key valuation inputs are unobservable and management considers these Level 3 assets. For disclosure regarding the fair value of servicing rights, see Note 10. Pension Plan Assets For disclosure regarding the fair value of pension plan assets, see Note 18. Assets and Liabilities Measured at Fair Value on a Recurring Basis The table below presents United’s assets and liabilities measured at fair value on a recurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall (in thousands) : December 31, 2019 Level 1 Level 2 Level 3 Total Assets: Debt securities available for sale: U.S. Treasuries $ 154,618 $ — $ — $ 154,618 U.S. Government agencies — 3,035 — 3,035 State and political subdivisions — 226,490 — 226,490 Residential mortgage-backed securities — 1,299,025 — 1,299,025 Commercial mortgage-backed securities — 284,953 — 284,953 Corporate bonds — 202,093 998 203,091 Asset-backed securities — 103,369 — 103,369 Equity securities with readily determinable fair values 1,973 — — 1,973 Mortgage loans held for sale — 58,484 — 58,484 Deferred compensation plan assets 8,133 — — 8,133 Servicing rights for SBA/USDA loans — — 6,794 6,794 Residential mortgage servicing rights — — 13,565 13,565 Derivative financial instruments — 27,769 7,238 35,007 Total assets $ 164,724 $ 2,205,218 $ 28,595 $ 2,398,537 Liabilities: Deferred compensation plan liability $ 8,132 $ — $ — $ 8,132 Derivative financial instruments — 6,957 8,559 15,516 Total liabilities $ 8,132 $ 6,957 $ 8,559 $ 23,648 December 31, 2018 Level 1 Level 2 Level 3 Total Assets: Securities available for sale: U.S. Treasuries $ 149,307 $ — $ — $ 149,307 U.S. Government agencies — 25,553 — 25,553 State and political subdivisions — 233,941 — 233,941 Residential mortgage-backed securities — 1,445,910 — 1,445,910 Commercial mortgage-backed securities — 391,917 — 391,917 Corporate bonds — 198,168 995 199,163 Asset-backed securities — 182,676 — 182,676 Equity securities with readily determinable fair values 1,076 — — 1,076 Mortgage loans held for sale — 18,935 — 18,935 Deferred compensation plan assets 6,404 — — 6,404 Servicing rights for SBA/USDA loans — — 7,510 7,510 Residential mortgage servicing rights — — 11,877 11,877 Derivative financial instruments — 12,864 11,841 24,705 Total assets $ 156,787 $ 2,509,964 $ 32,223 $ 2,698,974 Liabilities: Deferred compensation plan liability $ 6,404 $ — $ — $ 6,404 Derivative financial instruments — 10,701 15,732 26,433 Total liabilities $ 6,404 $ 10,701 $ 15,732 $ 32,837 For disclosure regarding the fair value of servicing rights, see Note 10. The following table shows a reconciliation of the beginning and ending balances for all other assets measured at fair value on a recurring basis using significant unobservable inputs that are classified as Level 3 values (in thousands) : Derivative Asset Derivative Liability Debt Securities Available- for-Sale December 31, 2016 $ 11,777 $ 16,347 $ 675 Sales and settlements (1,744 ) (2,423 ) — Other comprehensive income — — 225 Amounts included in earnings - fair value adjustments 2,174 2,820 — December 31, 2017 12,207 16,744 900 Sales and settlements (1,029 ) (1,347 ) — Other comprehensive income — — 95 Amounts included in earnings - fair value adjustments 663 335 — December 31, 2018 11,841 15,732 995 Sales and settlements (1,135 ) (2,330 ) — Other comprehensive income — — 3 Amounts included in earnings - fair value adjustments (3,468 ) (4,843 ) — December 31, 2019 $ 7,238 $ 8,559 $ 998 The following table presents quantitative information about recurring Level 3 fair value measurements, excluding servicing rights which are detailed in Note 10 (in thousands) : Fair Value Weighted Average December 31, Valuation Technique December 31, Level 3 Assets 2019 2018 Unobservable Inputs 2019 2018 Corporate bonds 998 995 Indicative bid provided by a broker Multiple factors, including but not limited to, current operations, financial condition, cash flows, and recently executed financing transactions related to the company N/A N/A Derivative assets - mortgage 1,970 1,190 Internal model Pull through rate 83.6 % 80.7 % Derivative assets - other 5,268 10,651 Dealer priced Dealer priced N/A N/A Derivative liabilities - risk participations 12 8 Internal model Probable exposure rate 0.36 % 0.44 % Probability of default rate 1.80 % 1.80 % Derivative liabilities - other 8,547 15,724 Dealer priced Dealer priced N/A N/A Fair Value Option At December 31, 2019 , mortgage loans held for sale for which the fair value option was elected had an aggregate fair value and outstanding principal balance of $58.5 million and $56.6 million , respectively. At December 31, 2018 , mortgage loans held for sale for which the fair value option was elected had an aggregate fair value and outstanding principal balance of $18.9 million and $18.2 million , respectively. Interest income on these loans is calculated based on the note rate of the loan and is recorded in interest revenue. During 2019 , 2018 , and 2017 changes in fair value of these loans resulted in net gains of $1.18 million , net losses of $133,000 , and net gains of $505,000 respectively, which were recorded in mortgage loan and other related fees. These changes in fair value were mostly offset by hedging activities. An immaterial portion of these amounts was attributable to changes in instrument-specific credit risk. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis United may be required, from time to time, to measure certain assets at fair value on a nonrecurring basis. These adjustments to fair value usually result from the application of lower of amortized cost or fair value accounting or write-downs of individual assets due to impairment. The following table presents the fair value hierarchy and carrying value of all assets that were still held as of December 31, 2019 and 2018 , for which a nonrecurring fair value adjustment was recorded during the periods presented (in thousands) . December 31, 2019 Level 1 Level 2 Level 3 Total Loans $ — $ — $ 20,977 $ 20,977 December 31, 2018 Loans $ — $ — $ 8,631 $ 8,631 Loans that are reported above as being measured at fair value on a nonrecurring basis are generally impaired loans that have either been partially charged off or have specific reserves assigned to them. Nonaccrual impaired loans that are collateral dependent are generally written down to 80% of appraised value which considers the estimated costs to sell. Specific reserves are established for impaired loans based on appraised value of collateral or discounted cash flows, although only those specific reserves based on the fair value of collateral are considered nonrecurring fair value adjustments. When the fair value of the collateral is based on an observable market price or a current appraised value, United records the impaired loan as nonrecurring Level 2. When an appraised value is not available or management determines the fair value is further impaired below the appraised value and there is no observable market price, United records the impaired loan as nonrecurring Level 3. Assets and Liabilities Not Measured at Fair Value For financial instruments that have quoted market prices in active markets, those quotes are used to determine fair value. Financial instruments that have no defined maturity, have a remaining maturity of 180 days or less, or have variable interest rates that reset frequently to a market rate are assumed to have a fair value that approximates reported book value, after taking into consideration any applicable credit risk. If no market quotes are available, financial instruments are valued by discounting the expected cash flows using an estimated current market interest rate for the financial instrument. Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect the premium or discount on any particular financial instrument that could result from the sale of United’s entire holdings. Because no ready market exists for a significant portion of United’s financial instruments, fair value estimates are based on many judgments. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates. Cash and cash equivalents and repurchase agreements have short maturities and therefore the carrying value approximates fair value. Due to the short-term settlement of accrued interest receivable and payable, the carrying amount closely approximates fair value. Off-balance sheet instruments (commitments to extend credit and standby letters of credit) for which draws can be reasonably predicted are generally short-term and at variable rates. Therefore, both the carrying amount and the estimated fair value associated with these instruments are immaterial. The carrying amount and fair values for other financial instruments that are not measured at fair value on a recurring basis in United’s consolidated balance sheets are as follows (in thousands) : Carrying Amount Fair Value Level December 31, 2019 Level 1 Level 2 Level 3 Total Assets: Securities held to maturity $ 283,533 $ — $ 287,904 $ — $ 287,904 Loans, net 8,750,464 — — 8,714,592 8,714,592 Liabilities: Deposits 10,897,244 — 10,897,465 — 10,897,465 Long-term debt 212,664 — — 217,665 217,665 December 31, 2018 Assets: Securities held to maturity $ 274,407 $ — $ 268,803 $ — $ 268,803 Loans, net 8,322,198 — — 8,277,387 8,277,387 Liabilities: Deposits 10,534,513 — 10,528,834 — 10,528,834 Federal Home Loan Bank advances 160,000 — 159,988 — 159,988 Long-term debt 267,189 — — 278,996 278,996

Condensed Financial Statements

Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Condensed Financial Statements of United Community Banks, Inc. (Parent Only)	Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) Statements of Income For the Years Ended December 31, 2019 , 2018 and 2017 (in thousands) 2019 2018 2017 Dividends from bank $ — $ 161,500 $ 103,200 Dividends from other subsidiaries 4,651 850 — Shared service fees from subsidiaries 14,721 10,257 10,481 Other 1,468 133 1,078 Total income 20,840 172,740 114,759 Interest expense 11,573 11,868 10,258 Other expense 18,965 14,456 14,960 Total expenses 30,538 26,324 25,218 Income tax benefit 8,711 1,640 1,447 Income before equity in undistributed (loss) earnings of subsidiaries (987 ) 148,056 90,988 Equity in undistributed earnings (loss) of subsidiaries 186,708 18,055 (23,167 ) Net income $ 185,721 $ 166,111 $ 67,821 Balance Sheets As of December 31, 2019 and 2018 (in thousands) 2019 2018 Assets Cash $ 32,495 $ 145,669 Investment in bank 1,814,414 1,522,402 Investment in other subsidiaries 752 4,549 Other assets 29,308 21,881 Total assets $ 1,876,969 $ 1,694,501 Liabilities and Shareholders’ Equity Long-term debt $ 212,664 $ 212,193 Other liabilities 28,613 24,754 Total liabilities 241,277 236,947 Shareholders’ equity 1,635,692 1,457,554 Total liabilities and shareholders’ equity $ 1,876,969 $ 1,694,501 Statements of Cash Flows For the Years Ended December 31, 2019 , 2018 and 2017 (in thousands) 2019 2018 2017 Operating activities: Net income $ 185,721 $ 166,111 $ 67,821 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed (earnings) loss of the subsidiaries (186,708 ) (18,055 ) 23,167 Stock-based compensation 9,360 6,057 5,827 Change in assets and liabilities: Other assets (3,022 ) 1,777 1,220 Other liabilities 2,080 3,124 (758 ) Net cash provided by operating activities 7,431 159,014 97,277 Investing activities: Payment for acquisition (52,093 ) (84,499 ) (11,034 ) Purchases of premises and equipment — (364 ) (708 ) Purchases of debt securities available-for-sale and equity securities (3,000 ) (2,489 ) — Proceeds from sales and maturities of debt securities available-for-sale and equity securities 83 — — Net cash used in investing activities (55,010 ) (87,352 ) (11,742 ) Financing activities: Repayment of long-term debt (250 ) (7,424 ) (75,000 ) Proceeds from issuance of long-term debt, net of issuance costs — 98,188 — Cash related to shares withheld to cover payroll taxes upon vesting of restricted stock units (1,686 ) (1,998 ) (1,701 ) Proceeds from issuance of common stock for dividend reinvestment and employee benefit plans 2,193 679 450 Proceeds from exercise of stock options 212 142 — Repurchase of common stock (13,020 ) — — Cash dividends on common stock (53,044 ) (41,634 ) (26,210 ) Net cash (used in) provided by financing activities (65,595 ) 47,953 (102,461 ) Net change in cash (113,174 ) 119,615 (16,926 ) Cash at beginning of year 145,669 26,054 42,980 Cash at end of year $ 32,495 $ 145,669 $ 26,054

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividends Declared On February 5, 2020 , United’s Board of Directors approved a regular quarterly cash dividend of $0.18 per common share. The dividend is payable April 6, 2020 , to shareholders of record on March 16, 2020 . Stock Repurchases As of February 26, 2020 , United had repurchased 331,482 shares totaling $9.40 million

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation United Community Banks, Inc. (the “Holding Company”) is a bank holding company subject to the regulation of the Board of Governors of the Federal Reserve System (the “Federal Reserve”) whose principal business is conducted by its wholly-owned commercial bank subsidiary, United Community Bank (the “Bank”). United is subject to regulation under the Bank Holding Company Act of 1956. The consolidated financial statements include the accounts of the Holding Company, the Bank and other wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation. The Bank is a Georgia state chartered commercial bank that serves both rural and metropolitan markets in Georgia, South Carolina, North Carolina and Tennessee and provides a full range of banking services. The Bank is insured and subject to the regulation of the Federal Deposit Insurance Corporation (“FDIC”) and is also subject to the regulation of the Georgia Department of Banking and Finance.
Use of Estimates	Use of Estimates In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the dates of the balance sheet and revenue and expenses for the years then ended. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant change are the determination of the allowance for loan losses, the valuation of acquired loans, the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans, the valuation of goodwill and separately identifiable intangible assets associated with mergers and acquisitions, and the valuation of deferred tax assets.
Operating Segments	Operating Segments Operating segments are components of a business about which separate financial information is available and evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assessing performance. Public companies are required to report certain financial information about operating segments in interim and annual financial statements. United’s community banking operations are divided among geographic regions and local community banks within those regions. Those regions and banks have similar economic characteristics and are therefore considered to be one operating segment. Additionally, management assessed other operating units to determine if they should be classified and reported as segments, including Mortgage, Advisory Services and Commercial Banking Solutions. Qualitatively, these business units are currently operating in the same geographic footprint as the community banks and face many of the same customers as the community banks. While the chief operating decision maker does have some limited production information for these entities, that information is not complete since it does not include a full allocation of revenue, costs and capital from key corporate functions. The business units are currently viewed more as a product line extension of the community banks. However, management will continue to evaluate these business units for separate reporting as facts and circumstances change. Based on this analysis, United concluded that it has one operating and reportable segment.
Accounting for Variable Interest Entities	Accounting for Variable Interest Entities The consolidated financial statements also include the results of a bankruptcy-remote securitization entity, Navitas Equipment Receivables LLC 2016-1 (“NER 16-1”), acquired with NLFC Holdings Corp. (“Navitas”). NER 16-1 was formed solely to receive loans transferred from Navitas to be used as collateral for a term note securitization. Navitas is the primary beneficiary of NER 16-1. As a result, while the transfer of the loans meets the criteria of a sale, NER 16-1 is consolidated on United’s books and therefore the transfer is accounted for as a secured borrowing. NER 16-1 differs from other entities included in United’s consolidated statements because the assets it holds are legally isolated. At December 31, 2018, NER 16-1 had total assets of $65.5 million and total liabilities of $55.3 million . During 2019, NER 16-1 executed a payoff and termination of the remaining notes outstanding in accordance with the terms of the related securitization documents.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash equivalents include amounts due from banks, interest-bearing deposits in banks, federal funds sold, commercial paper, reverse repurchase agreements and short-term investments and are carried at cost. Federal funds are generally sold for one-day periods, interest-bearing deposits in banks are available on demand and commercial paper investments and reverse repurchase agreements mature within a period of less than 90 days. A portion of the cash on hand and on deposit with the Federal Reserve Bank of Atlanta was required to meet regulatory reserve requirements.
Investment Securities	Investment Securities United classifies its debt securities in one of three categories: trading, held-to-maturity or available-for-sale. United does not currently hold any trading securities that are bought and held principally for the purpose of selling them in the near term. Held-to-maturity securities are those securities for which United has the ability and intent to hold until maturity. All other securities are classified as available-for-sale. Held-to-maturity securities are recorded at cost, adjusted for the amortization or accretion of premiums or discounts. Available-for-sale securities are recorded at fair value. Unrealized holding gains and losses, net of the related tax effect, on available-for-sale securities are reported in other comprehensive income as a separate component of shareholders’ equity until realized. Transfers of securities between categories are recorded at fair value at the date of transfer. Unrealized holding gains or losses associated with transfers of securities from available-for-sale to held-to-maturity are included in the balance of accumulated other comprehensive income in the consolidated balance sheets. These unrealized holding gains or losses are amortized into income over the remaining life of the security as an adjustment to the yield in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security. Management evaluates investment securities for other than temporary impairment on a quarterly basis. A decline in the fair value of available-for-sale and held-to-maturity securities below cost that is deemed other than temporary is charged to earnings for a decline in value deemed to be credit related. The decline in value attributed to non-credit related factors is recognized in other comprehensive income and a new cost basis for the security is established. Premiums and discounts are amortized or accreted over the life of the related security as an adjustment to the yield. Realized gains and losses for securities classified as available-for-sale and held-to-maturity are included in net income and derived using the specific identification method for determining the cost of the securities sold. Equity securities are included in other assets on the consolidated balance sheets. Those with readily determinable fair values are carried at fair value with changes in fair value recognized in net income. Those without readily determinable fair values include, among others, Federal Home Loan Bank (“FHLB”) stock held to meet FHLB requirements related to outstanding advances and Community Reinvestment Act (“CRA”) equity investments, including those where the returns are primarily derived from low income housing tax credits (“LIHTC”). Our investment in FHLB stock, which totaled $11.5 million at December 31, 2019 , is accounted for using the cost method of accounting. Our LIHTC investments are accounted for using the proportional amortization method of accounting for qualified affordable housing investments which results in the amortization being reported as a component of income tax expense. Our obligations related to unfunded commitments for our LIHTC investments are reported in other liabilities. Our other CRA investments are accounted for using the equity method of accounting. As conditions warrant, we review our investments for impairment and will adjust the carrying value of the investment if it is deemed to be impaired.
Loans Held for Sale	Loans Held for Sale United has elected the fair value option for most of its newly originated mortgage loans held for sale in order to reduce certain timing differences and match changes in fair values of the loans with changes in the fair value of derivative instruments used to economically hedge them.
Loans and Leases	Loans and Leases With the exception of purchased loans that are recorded at fair value on the date of acquisition, loans are stated at principal amount outstanding, net of any unearned revenue and net of any deferred loan fees and costs. Interest on loans is primarily calculated by using the simple interest method on daily balances of the principal amount outstanding. Equipment Financing Lease Receivables: Equipment financing lease receivables, which are classified as sales-type or direct financing leases, are recorded as the sum of the future minimum lease payments, initial deferred costs and estimated or contractual residual values less unearned income and security deposits. The determination of residual value is derived from a variety of sources including equipment valuation services, appraisals, and publicly available market data on recent sales transactions on similar equipment. The length of time until contract termination, the cyclical nature of equipment values and the limited marketplace for re-sale of certain leased assets are important variables considered in making this determination. Interest income, which is included in loan interest revenue in the consolidated statements of income, is recognized as earned using the effective interest method. Direct fees and costs associated with the origination of leases are deferred and included as a component of equipment financing receivables. Net deferred fees or costs are recognized as an adjustment to interest income over the contractual life of the lease using the effective interest method. These lease agreements may include options to renew and for the lessee to purchase the leased equipment at the end of the lease term. United excludes sales taxes from consideration in these lease contracts. Purchased Loans With Evidence of Credit Deterioration: United from time to time purchases loans, primarily through business combination transactions. Some of those purchased loans show evidence of credit deterioration since origination and are accounted for pursuant to Accounting Standards Codification (“ASC”) Topic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality . These purchased credit impaired (“PCI”) loans are recorded at their estimated fair value at date of purchase. After acquisition, further losses evidenced by decreases in expected cash flows are recognized by an increase in the allowance for loan losses. PCI loans are aggregated into pools of loans based on common risk characteristics such as the type of loan, payment status, or collateral type. United estimates the amount and timing of expected cash flows for each purchased loan pool and the expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the pool (accretable yield). The excess of the pool’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). Over the life of the loan pool, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded. If the present value of expected cash flows is greater than the carrying amount, it is recognized as part of future interest revenue. Nonaccrual Loans: The accrual of interest is discontinued when a loan becomes 90 days past due and is not well collateralized and in the process of collection, or when management believes, after considering economic and business conditions and collection efforts, that the principal or interest will not be collectible in the normal course of business. Past due status is based on contractual terms of the loan. When a loan is placed on nonaccrual status, previously accrued and uncollected interest is charged against interest revenue on loans. Interest payments are applied to reduce the principal balance on nonaccrual loans. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current, there is a sustained period of repayment performance and future payments are reasonably assured. Nonaccrual loans include smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. Contractually delinquent PCI loans are not classified as nonaccrual as long as the related discount continues to be accreted. Impaired Loans: With the exception of PCI loans, a loan is considered impaired when, based on current events and circumstances, it is probable that all amounts due, according to the contractual terms of the loan, will not be collected. Individually impaired loans are measured based on the present value of expected future cash flows, discounted at the loan’s effective interest rate, at the loan’s observable market price, or the fair value of the collateral if the loan is collateral dependent. Interest revenue on impaired loans is discontinued when the loans meet the criteria for nonaccrual status. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not considered impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. PCI loans are considered to be impaired when it is probable that United will be unable to collect all the cash flows expected at acquisition, plus additional cash flows expected to be collected arising from changes in estimates after acquisition. Loans that are accounted for in pools are evaluated collectively for impairment on a pool by pool basis based on expected pool cash flows. Discounts continue to be accreted as long as there are expected future cash flows in excess of the current carrying amount of the specifically-reviewed loan or pool. Concentration of Credit Risk: Most of United’s business activity is with customers located within the markets where it has banking operations. Therefore, United’s exposure to credit risk is significantly affected by changes in the economy within its markets. Approximately 76% of United’s loan portfolio is secured by real estate and is therefore susceptible to changes in real estate valuations.
Allowance for Credit Losses	Allowance for Credit Losses The allowance for credit losses includes the allowance for loan losses and the allowance for unfunded commitments included in other liabilities. Increases to the allowance for loan losses and allowance for unfunded commitments are established through a provision for credit losses charged to income. Loans are charged down against the allowance for loan losses when available information confirms that the collectability of the principal is unlikely. The allowance for loan losses represents an amount, which, in management’s judgment, is adequate to absorb probable losses on existing loans as of the date of the balance sheet. The allowance for unfunded commitments represents expected losses on unfunded commitments and is reported in the consolidated balance sheets in other liabilities. The allowance for loan losses is composed of general reserves, specific reserves, and PCI reserves. General reserves are determined by applying loss percentages to the individual loan categories that are based on actual historical loss experience. Additionally, the general economic and business conditions affecting key lending areas, credit quality trends, collateral values, loan volumes and concentrations, seasoning of the loan portfolio, the findings of internal and external credit reviews and results from external bank regulatory examinations are considered in this evaluation. The need for specific reserves is evaluated on nonaccrual loan relationships greater than $500,000 and all troubled debt restructurings (“TDRs”). The specific reserves are determined on a loan-by-loan basis based on management’s evaluation of United’s exposure for each credit, given the current payment status of the loan and the value of any underlying collateral. Loans for which specific reserves are provided are excluded from the calculation of general reserves. For PCI loans, a valuation allowance is established when it is probable that the Company will be unable to collect all the cash flows expected at acquisition plus additional cash flows expected to be collected arising from changes in estimate after acquisition. The allocation of the allowance for loan losses is based on historical data, subjective judgment and estimates and, therefore, is not necessarily indicative of the specific amounts or loan categories in which charge-offs may ultimately occur. For purposes of determining general reserves, United segments the loan portfolio into broad categories with similar risk elements. Those categories and their specific risks are described below. Owner occupied commercial real estate – Loans in this category are susceptible to business failure and general economic conditions. Income producing commercial real estate – Common risks for this loan category are declines in general economic conditions, declines in real estate value, declines in occupancy rates, and lack of suitable alternative use for the property. Commercial & industrial – Risks to this loan category include customer or industry concentrations and the inability to monitor the condition of the collateral which often consists of inventory, accounts receivable and other non-real estate assets. Equipment and inventory obsolescence can also pose a risk. Declines in general economic conditions and other events can cause cash flows to fall to levels insufficient to service debt. Commercial construction – Risks common to commercial construction loans are cost overruns, changes in market demand for property, inadequate long-term financing arrangements and declines in real estate values. Equipment financing - Risks associated with equipment financing are similar to those described for commercial and industrial loans, including general economic conditions, as well as appropriate lien priority on equipment, equipment obsolescence and the general mobility of the collateral. Residential mortgage – Residential mortgage loans are susceptible to weakening general economic conditions and increases in unemployment rates and declining real estate values. Home equity lines of credit – Risks common to home equity lines of credit are general economic conditions, including an increase in unemployment rates, and declining real estate values which reduce or eliminate the borrower’s home equity. Residential construction – Residential construction loans are susceptible to the same risks as residential mortgage loans. Changes in market demand for property leads to longer marketing times resulting in higher carrying costs, declining values, and higher interest rates. Consumer direct – Risks common to consumer direct loans include regulatory risks, unemployment and changes in local economic conditions as well as the inability to monitor collateral consisting of personal property. Indirect auto - Risks common to indirect auto loans include unemployment and changes in local economic conditions as well as the inability to monitor collateral. During 2019, United sold its portfolio of indirect auto loans. Management outsources a significant portion of its loan review to ensure objectivity in the loan review process and to challenge and corroborate the loan grading system. The loan review function provides additional analysis used in determining the adequacy of the allowance for loan losses. To supplement the outsourced loan review, management also has an internal loan review department that is independent of the lending function. Management believes the allowance for loan losses is appropriate at December 31, 2019 . While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based on changes in economic conditions. In addition, various regulatory agencies, as an integral part of their examination process, periodically review United’s allowance for loan losses.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed primarily using the straight line method over the estimated useful lives of the related assets. Costs incurred for maintenance and repairs are expensed as incurred. The range of estimated useful lives for buildings and improvements is 10 to 40 years , for land improvements, 10 years , and for furniture and equipment, 3 to 10 years . United periodically reviews the carrying value of premises and equipment for impairment whenever events or circumstances indicate that the carrying amount of such assets may not be fully recoverable.
Foreclosed Properties (Other Real Estate Owned, or OREO)	Foreclosed Properties (Other Real Estate Owned, or “OREO”) Foreclosed property is initially recorded at fair value, less cost to sell. If the fair value, less cost to sell at the time of foreclosure is less than the loan balance, the deficiency is recorded as a loan charge-off against the allowance for loan losses. If the fair value, less cost to sell, of the foreclosed property decreases during the holding period, a valuation allowance is established with a charge to operating expenses. When the foreclosed property is sold, a gain or loss is recognized on the sale for the difference between the sales proceeds and the carrying amount of the property.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill is an asset representing the future economic benefits from other assets acquired that are not individually identified and separately recognized. Goodwill is measured as the excess of the consideration transferred, net of the fair value of identifiable assets acquired and liabilities assumed at the acquisition date. Goodwill is not amortized, but instead is tested for impairment annually or more frequently if events or circumstances exist that indicate a goodwill impairment test should be performed. Other intangible assets, which are initially recorded at fair value, consist of core deposit intangible assets and noncompete agreements resulting from acquisitions. Core deposit intangible assets are amortized on a sum-of-the-years-digits basis over their estimated useful lives. Noncompete agreements, which were fully amortized at December 31, 2019, were amortized on a straight line basis over their estimated useful lives. Management evaluates other intangible assets for impairment whenever events or changes in circumstances indicate the carrying amount of the asset may not be recoverable.
Transfers of Financial Assets	Transfers of Financial Assets Transfers of financial assets are accounted for as sales when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from United, the transferee obtains the right, free of conditions that constrain it from taking advantage of that right, to pledge or exchange the transferred assets and United does not maintain effective control over the transferred assets through an agreement to repurchase them before maturity.
Servicing Rights	Servicing Rights United records a separate servicing asset for Small Business Administration (“SBA”) loans, United States Department of Agriculture (“USDA”) loans, and residential mortgage loans when the loan is sold but servicing is retained. This asset represents the right to service the loans and receive a fee in compensation. Servicing assets are initially recorded at their fair value as a component of the sale proceeds. The fair value of the servicing assets is based on an analysis of discounted cash flows that incorporates estimates of (1) market servicing costs, (2) market-based prepayment rates, and (3) market profit margins. Servicing assets are included in other assets. United has elected to subsequently measure the servicing assets for government guaranteed loans at fair value. There is no aggregation of the loans into pools for the valuation of the servicing asset, but rather the servicing asset value is measured at a loan level. Effective January 1, 2017, management elected to begin measuring residential mortgage servicing rights at fair value. The cumulative effect adjustment of this election to retained earnings, net of income tax effect, was $437,000 . The rate of prepayment of loans serviced is the most significant estimate involved in the measurement process. Estimates of prepayment rates are based on market expectations of future prepayment rates, industry trends, and other considerations. Actual prepayment rates will differ from those projected by management due to changes in a variety of economic factors, including prevailing interest rates and the availability of alternative financing sources to borrowers. If actual prepayments of the loans being serviced were to occur more quickly than projected, the carrying value of servicing assets might have to be written down through a charge to earnings in the current period. If actual prepayments of the loans being serviced were to occur more slowly than had been projected, the carrying value of servicing assets could increase, and servicing income would exceed previously projected amounts.
Bank Owned Life Insurance	Bank Owned Life Insurance United has purchased life insurance policies on certain key executives and members of management. United has also received life insurance policies on members of acquired bank management teams through acquisitions of other banks. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other changes or other amounts due that are probable at settlement.
Operating Leases	Operating Leases Effective January 1, 2019, United records a right-of-use asset, included in other assets, and a related lease liability, included in other liabilities, for eligible operating leases for which it is the lessee, which include leases for land, buildings, and equipment. Payments related to these leases consist primarily of base rent and, in the case of building leases, additional operating costs associated with the leased property such as common area maintenance and utilities. In most cases these operating costs vary over the term of the lease, and therefore are classified as variable lease costs, which are recognized as incurred in the consolidated statement of income. In addition, certain operating leases include costs such as property taxes and insurance, which are recognized as incurred in the consolidated statement of income. Many of United’s operating leases contain renewal options, most of which are excluded from the measurement of the right-of-use asset and lease liability as they are not reasonably certain to be exercised. United also subleases and leases certain real estate properties to third parties under operating leases. United does not recognize a lease liability or right-of-use asset on the consolidated balance sheet related to short-term leases with a term of less than one year. Lease payments for short-term leases are recognized as expense over the lease term.
Loan Commitments and Related Financial Instruments	Loan Commitments and Related Financial Instruments Financial instruments include off-balance sheet credit instruments such as commitments to make loans and commercial letters of credit issued to meet customer financing needs. The face amount for these items represents the exposure to loss before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.
Revenue from Contracts with Customers	Revenue from Contracts with Customers In addition to lending and related activities, United offers various services to customers that generate revenue, certain of which are governed by ASC Topic 606 Revenue from Contracts with Customers (“ASC 606”). United’s services that fall within the scope of ASC 606 are presented within noninterest income and include service charges and fees, brokerage fees, and other transaction-based fees. Revenue is recognized when the transactions occur or as services are performed over primarily monthly or quarterly periods. Payment is typically received in the period the transactions occur. Fees may be fixed or, where applicable, based on a percentage of transaction size.
Income Taxes	Income Taxes Deferred tax assets and liabilities are recorded for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Future tax benefits are recognized to the extent that realization of such benefits is more likely than not. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which the assets and liabilities are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income taxes during the period that includes the enactment date. In the event the future tax consequences of differences between the financial reporting bases and the tax bases of assets and liabilities results in deferred tax assets, an evaluation of the probability of being able to realize the future benefits indicated by such asset is required. A valuation allowance is provided for the portion of the deferred tax asset when it is more likely than not that some or all of the deferred tax asset will not be realized. In assessing the realizability of the deferred tax assets, management considers the scheduled reversals of deferred tax liabilities, projected future taxable earnings and prudent and feasible tax planning strategies. Management weighs both the positive and negative evidence, giving more weight to evidence that can be objectively verified. The income tax benefit or expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50 percent likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. United recognizes interest and / or penalties related to income tax matters in income tax expense.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities United’s interest rate risk management strategy incorporates the use of derivative instruments to minimize fluctuations in net income that are caused by interest rate volatility. The objective is to manage interest rate sensitivity by modifying the repricing or maturity characteristics of certain balance sheet assets and liabilities so that net interest revenue is not, on a material basis, adversely affected by movements in interest rates. United views this strategy as a prudent management of interest rate risk, such that net income is not exposed to undue risk presented by changes in interest rates. In carrying out this part of its interest rate risk management strategy, management uses derivatives, primarily interest rate swaps. Interest rate swaps generally involve the exchange of fixed- and variable-rate interest payments between two parties, based on a common notional principal amount and maturity date. United has also occasionally used interest rate caps to serve as an economic macro hedge of exposure to rising interest rates. In addition, United originates certain residential mortgage loans with the intention of selling these loans. Between the time United enters into an interest-rate lock commitment to originate a residential mortgage loan that is to be held for sale and the time the loan is funded and eventually sold, the Company is subject to the risk of variability in market prices. United also enters into forward sale agreements to mitigate risk and to protect the expected gain on the eventual loan sale. The commitments to originate residential mortgage loans and forward loan sales commitments are freestanding derivative instruments. To accommodate customers, United enters into interest rate swaps or caps with certain commercial loan customers, with offsetting positions to dealers under a back-to-back swap/cap program. In addition, United occasionally enters into credit risk participation agreements with counterparty banks to accept a portion of the credit risk related to interest rate swaps. This allows customers to execute an interest rate swap with one bank while allowing for the distribution of the credit risk among participating members. Credit risk participation agreements arise when United contracts with other financial institutions, as a guarantor, to share credit risk associated with certain interest rate swaps. These agreements provide for reimbursement of losses resulting from a third party default on the underlying swap. These transactions are typically executed in conjunction with a participation in a loan with the same customer. Collateral used to support the credit risk for the underlying lending relationship is also available to offset the risk of the credit risk participation. United classifies its derivative financial instruments as either (1) a hedge of an exposure to changes in the fair value of a recorded asset or liability (“fair value hedge”), (2) a hedge of an exposure to changes in the cash flows of a recognized asset, liability or forecasted transaction (“cash flow hedge”), or (3) derivatives not designated as accounting hedges. Changes in the fair value of derivatives not designated as hedges are recognized in current period earnings. United has master netting agreements with the derivatives dealers with which it does business, but reflects gross assets and liabilities on the consolidated balance sheets. United currently uses the “long-haul method” to assess hedge effectiveness. Management documents, both at inception and over the life of the hedge, at least quarterly, its analysis of actual and expected hedge effectiveness. This analysis includes techniques such as regression analysis and hypothetical derivatives to demonstrate that the hedge has been, and is expected to be, highly effective in offsetting corresponding changes in the fair value or cash flows of the hedged item. For a qualifying fair value hedge, changes in the value of derivatives that have been highly effective as hedges are recognized in current period earnings along with the corresponding changes in the fair value of the designated hedged item attributable to the risk being hedged. For a qualifying cash flow hedge, the portion of changes in the fair value of the derivatives that have been highly effective are recognized in other comprehensive income until the related cash flows from the hedged item are recognized in earnings. For fair value hedges and cash flow hedges, ineffectiveness is recognized in the same income statement line as interest accruals on the hedged item to the extent that changes in the value of the derivative instruments do not perfectly offset changes in the value of the hedged items. If the hedge ceases to be highly effective, United discontinues hedge accounting and recognizes the changes in fair value in current period earnings. If a derivative that qualifies as a fair value or cash flow hedge is terminated or the designation removed, the realized or then unrealized gain or loss is recognized into income over the life of the hedged item (fair value hedge) or over the time when the hedged item was forecasted to impact earnings (cash flow hedge). Immediate recognition in earnings is required upon sale or extinguishment of the hedged item (fair value hedge) or if it is probable that the hedged cash flows will not occur (cash flow hedge). By using derivative instruments, United is exposed to credit and market risk. If the counterparty fails to perform, credit risk is represented by the fair value gain in a derivative. When the fair value of a derivative contract is positive, this situation generally indicates that the counterparty is obligated to pay United, and, therefore, creates a repayment risk for United. When the fair value of a derivative contract is negative, United is obligated to pay the counterparty and, therefore, has no repayment risk. United minimizes the credit risk in non-customer derivative instruments by entering into transactions with high-quality counterparties that are reviewed periodically by management. United also requires non-customer counterparties to pledge cash as collateral to cover the net exposure. All newly eligible non-customer derivatives entered into are cleared through a central clearinghouse, which reduces counterparty exposure. Derivative activities are monitored by the Asset/Liability Management Committee (“ALCO”) as part its oversight of asset/liability and treasury functions. ALCO is responsible for implementing various hedging strategies that are developed through its analysis of data from financial simulation models and other internal and industry sources. The resulting hedging strategies are then incorporated into the overall interest-rate risk management process. United recognizes the fair value of derivatives as assets or liabilities in the financial statements. The accounting for the changes in the fair value of a derivative depends on the intended use of the derivative instrument at inception. The change in fair value of instruments used as fair value hedges is accounted for in the net income of the period simultaneous with accounting for the fair value change of the item being hedged. The change in fair value of the effective portion of cash flow hedges is accounted for in other comprehensive income rather than net income. Changes in fair value of derivative instruments that are not designated as a hedge are accounted for in the net income of the period of the change.
Acquisition Activities	Acquisition Activities United accounts for business combinations under the acquisition method of accounting. Assets acquired and liabilities assumed are measured and recorded at fair value at the date of acquisition, including identifiable intangible assets. If the fair value of net assets purchased exceeds the fair value of consideration paid, a bargain purchase gain is recognized at the date of acquisition. Conversely, if the consideration paid exceeds the fair value of the net assets acquired, goodwill is recognized at the acquisition date. Fair values are subject to refinement for a period not to exceed one year after the closing date of an acquisition as information relative to closing date fair values becomes available. The determination of the fair value of loans acquired takes into account credit quality deterioration and probability of loss; therefore, the related allowance for loan losses is not carried forward. All identifiable intangible assets that are acquired in a business combination are recognized at fair value on the acquisition date. Identifiable intangible assets are recognized separately if they arise from contractual or other legal rights or if they are separable (i.e., capable of being sold, transferred, licensed, rented, or exchanged separately from the entity). Deposit liabilities and the related depositor relationship intangible assets may be exchanged in observable exchange transactions. As a result, the depositor relationship intangible asset is considered identifiable, because the separability criterion has been met.
Earnings Per Common Share	Earnings Per Common Share Basic earnings per common share is net income available to common shareholders divided by the weighted average number of shares of common stock outstanding during the period. All outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends are considered participating securities for this calculation. Additionally, shares issuable to participants in United’s deferred compensation plan are considered to be participating securities for purposes of calculating basic earnings per share. Accordingly, net income available to common shareholders is calculated pursuant to the two-class method, whereby net income is allocated between common shareholders and participating securities. Diluted earnings per common share includes the dilutive effect of additional potential shares of common stock issuable under stock options, unvested restricted stock units without nonforfeitable rights to dividends, warrants and securities convertible into common stock.
Loss Contingencies	Loss Contingencies Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there are such matters that will have a material effect on the financial statements.
Dividend Restrictions	Dividend Restrictions Banking regulations require maintaining certain capital levels and may limit dividends paid by the Bank to the Holding Company or by the Holding Company to shareholders. The board of directors may declare dividends from the Bank to the Holding Company out of retained earnings of up to fifty percent of the Bank’s net income from the previous year without notifying or seeking approval from the Georgia Department of Banking and Finance as long as total classified assets do not exceed 80% of tier 1 capital and the tier 1 risk based capital ratio is not less than 6%. Dividends paid by the Bank to the Holding Company in excess of that amount require pre-approval of the Georgia Department of Banking and Finance.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair values of financial instruments are estimated using relevant market information and other assumptions as more fully disclosed in Note 24. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect these estimates.
Stock-Based Compensation	Stock-Based Compensation United uses the fair value method of recognizing expense for stock-based compensation based on the fair value of option and restricted stock unit awards at the date of grant. United accounts for forfeitures as they occur.
Reclassifications	Reclassifications Certain amounts have been reclassified to conform to the 2019
Accounting Standards Updates	Accounting Standards Updates In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . The new guidance, which was further modified by subsequent related updates, replaces the incurred loss impairment framework in current GAAP with a current expected credit loss (“CECL”) framework, which requires an estimate of credit losses for the remaining estimated life of the financial asset using historical experience, current conditions, and reasonable and supportable forecasts and generally applies to financial assets measured at amortized cost and some off-balance sheet credit exposures. Financial assets measured at amortized cost will be presented at the net amount expected to be collected by using an allowance for credit losses. Purchased credit deteriorated (“PCD”) loans will receive an initial allowance at the acquisition date that represents an adjustment to the amortized cost basis of the loan, with no impact to earnings. Credit losses relating to available-for-sale debt securities will be recorded through an allowance for credit losses prospectively, with such allowance limited to the amount by which fair value is below amortized cost. United adopted ASC 326 as of January 1, 2020 using the modified retrospective method for loans, leases and off-balance sheet credit exposures. Adoption of this guidance resulted in an $8.75 million increase in the allowance for credit losses, comprised of increases in the allowance for loan losses of $6.88 million and the reserve for unfunded commitments of $1.87 million , with $3.59 million of the increase reclassified from the amortized cost basis of PCD financial assets that were previously classified as PCI. The cumulative effect adjustment to retained earnings was $3.53 million , net of tax. Calculated credit losses on held-to-maturity debt securities were not material and there was no impact to the available-for-sale portfolio or other financial instruments. The allowance for loan losses for the majority of loans and leases was calculated using a discounted cash flow methodology applied to fourteen portfolios with a one-year reasonable and supportable forecast period and a two-year straight-line reversion period. The increase in the allowance for loan losses at transition was primarily due to the equipment financing and residential mortgage portfolios. In connection with the adoption, management has implemented changes to relevant systems, processes and controls where necessary. Model validation was completed during the fourth quarter of 2019. In addition, management is in the final stages of implementing the accounting, reporting and governance processes to comply with the new guidance. United’s CECL allowance will fluctuate over time due to macroeconomic conditions and forecasts as well as the size and composition of the loan portfolios. With regard to PCD assets, because United has elected to break apart the former PCI pools and will no longer consider these pools to be the unit of account, contractually delinquent PCD loans will be reported as nonaccrual loans using the same criteria as other loans. Similarly, PCD loans that are restructured and meet the definition of troubled debt restructurings after the adoption of CECL will be reported as such. In April 2019, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825 Financial Instruments . In addition to amending guidance related to the new CECL standard, this update clarifies certain aspects of hedge accounting and recognition and measurement of financial instruments. United adopted this update as of January 1, 2020, with no material impact to the consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes . This update removes several exceptions related to intraperiod tax allocation when there is a loss from continuing operations and income from other items, foreign subsidiaries becoming equity method investments and vice versa, and calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. The guidance also amends requirements related to franchise tax that is partially based on income, a step up in the tax basis of goodwill, allocation of consolidated tax expense to a legal entity not subject to tax in its separate financial statements, the effects of enacted changes in tax laws and other minor codification improvements regarding employee stock ownership plans and investments in qualified affordable housing projects. For public entities, this guidance is effective for fiscal years beginning after December 15, 2020. United does not expect the new guidance to have a material impact on the consolidated financial statements. In January 2020, the FASB issued ASU No. 2020-01, Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815)—Clarifying the Interactions between Topic 321, Topic 323, and Topic 815 (a consensus of the Emerging Issues Task Force) . This update clarifies whether an entity should consider observable transactions that require it to either apply or discontinue the equity method of accounting for the purposes of applying the measurement alternative and how to account for certain forward contracts and purchased options to purchase securities. For public entities, this guidance is effective for fiscal years beginning after December 15, 2020. United does not expect the new guidance to have a material impact on the consolidated financial statements. Standards Adopted in 2019 On January 1, 2019, United adopted ASU No. 2016-02, Leases (Topic 842) , as modified by ASU No. 2018-10, Codification Improvements to Topic 842 Leases , ASU No. 2018-11, Leases (Topic 842): Targeted Improvements , ASU No. 2018-20, Leases (Topic 842): Narrow-Scope Improvements for Lessors and ASU No. 2019-01, Leases (Topic 842): Codification Improvements . These standards require a lessee to recognize in the consolidated balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. United adopted the standard using the optional transition method, which allowed for a modified retrospective method of adoption with a cumulative effect adjustment to shareholders’ equity without restating comparable periods. United also elected the relief package of practical expedients for which there is no requirement to reassess existence of leases, their classification, and initial direct costs as well as an exemption for short-term leases with a term of less than one year, whereby United does not recognize a lease liability or right-of-use asset on the consolidated balance sheet but instead recognizes lease payments as an expense over the lease term as appropriate. The adoption of this guidance resulted in recognition of a right-of-use asset of $23.8 million , a lease liability of $26.8 million and a reduction of shareholders’ equity of $549,000 , net of tax, related to its operating leases. In addition, United has equipment financing leases for which it is the lessor, which were previously accounted for as capital leases. Upon adoption of Topic 842, these leases were classified as sales-type or direct financing leases, which required no significant change in accounting policy or treatment. These lease agreements may include options to renew and for the lessee to purchase the leased equipment at the end of the lease term. As a lessor, United elected to exclude sales taxes from consideration in lease contracts. In the opinion of management, the changes described above resulting from the adoption of the standard did not have a material impact on the consolidated financial statements. See Notes 7 and 14 for additional information on operating leases and equipment financing leases, respectively. See Note 1 for further accounting policy detail related to leases. In July of 2019, the FASB issued ASU No. 2019-07, Codification updates to SEC sections: amendments to SEC paragraphs pursuant to SEC final rule releases No. 33-10532, disclosure update and simplification, and nos. 33-10231 and 33-10442, investment company reporting modernization, and miscellaneous updates. This standard updates various SEC financial statement disclosure requirements, including disclosures related to bank holding companies. The standard was effective immediately, and did not have a material impact on disclosures. In March 2017, the FASB issued ASU No. 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities . This update shortens the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. For securities held at a discount, the discount will continue to be amortized to maturity. For public entities, this update is effective for fiscal years beginning after December 15, 2018, with modified retrospective application. The adoption of this update on January 1, 2019 did not have a material impact on the consolidated financial statements. In August 2017, The FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities . This update expands and refines hedge accounting for both nonfinancial and financial risk components and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. This update also makes certain targeted improvements to simplify the application of hedge accounting guidance and ease the administrative burden of hedge documentation requirements and assessing hedge effectiveness. For public entities, this update is effective for fiscal years beginning after December 15, 2018. For cash flow and net investment hedges existing at the date of adoption, an entity should apply a cumulative-effect adjustment related to eliminating the separate measurement of ineffectiveness to accumulated other comprehensive income with a corresponding adjustment to the opening balance of retained earnings. The amended presentation and disclosure guidance is required prospectively. The adoption of this update on January 1, 2019 did not have a material impact on the consolidated financial statements. In June 2018, the FASB issued ASU No. 2018-07, Compensation - Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting . This update expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. As a result, nonemployee share-based payment awards will be measured at the grant-date fair value of the equity instruments that an entity is obligated to issue when the service has been rendered, subject to the probability of satisfying performance conditions when applicable. For public entities, this update is effective for fiscal years beginning after December 15, 2018. The adoption of the new guidance on January 1, 2019 did not have a material impact on the consolidated financial statements as United does not currently grant equity awards to nonemployees other than directors and does not anticipate doing so. In June 2018, the FASB issued ASU No. 2018-08, Not for Profit Entities (Topic 958): Clarifying the Scope and the Accounting Guidance for Contributions Received and Contributions Made . This update clarifies the guidance about whether a transfer of assets (or the reduction, settlement or cancellation of liabilities) is a contribution or an exchange transaction. In addition, the guidance clarifies the determination of whether a transaction is conditional. For public entities, this update is effective for contributions made in fiscal years beginning after December 15, 2018. The adoption of the new guidance on January 1, 2019 did not have a material impact on the consolidated financial statements. In July 2018, the FASB issued ASU No. 2018-09, Codification Improvements to address stakeholder suggestions for minor corrections and clarifications within the codification. The transition and effective date guidance is based on the facts and circumstances of each amendment. Some of the amendments in this update do not require transition guidance and will be effective upon issuance of this update. However, many of the amendments in this update do have transition guidance with effective dates for annual periods beginning after December 15, 2018, for public business entities. The adoption of the new guidance on January 1, 2019 did not have a material impact on the consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . The update removes disclosures that are no longer considered cost beneficial, modifies certain requirements of disclosures, and adds disclosure requirements identified as relevant. For public entities, this guidance is effective for fiscal years ending after December 15, 2019 and, depending on the provision, requires either prospective or retrospective application to prior periods presented. The adoption of this update did not have a material impact on the consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract (a consensus of the FASB Emerging Issues Task Force) . This update aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal use software. For public entities, this guidance is effective for fiscal years ending after December 15, 2019 with either retrospective or prospective application. The adoption of this update did not have a material impact on the consolidated financial statements. In October 2018, the FASB issued ASU No. 2018-16, Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes . This update permits the use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes. For public entities, this guidance is effective for fiscal years beginning after December 15, 2018 and should be applied on a prospective basis for qualifying new or redesignated hedging relationships. The adoption of this update on January 1, 2019 did not have a material impact on the consolidated financial statements.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2019
Business Acquisition [Line Items]
Schedule of actual results and pro forma information	The following table presents the actual results and pro forma information for the periods indicated (in thousands) . (Unaudited) Year Ended December 31, Revenue Net Income 2019 Actual FMBT results included in statement of income since acquisition date $ 7,525 $ 4,053 Supplemental consolidated pro forma as if FMBT had been acquired January 1, 2018 563,872 187,124 2018 Actual Navitas results included in the statement of income since acquisition date $ 24,285 $ 7,149 Supplemental consolidated pro forma as if FMBT had been acquired January 1, 2018 and Navitas had been acquired January 1, 2017 539,152 171,218 2017 Actual FOFN results included in statement of income since acquisition date $ 5,265 $ 1,406 Actual HCSB results included in statement of income since acquisition date 5,775 1,385 Supplemental consolidated pro forma as if FOFN and HCSB had been acquired January 1, 2016 and Navitas had been acquired January 1, 2017 495,052 78,958
FMBT
Business Acquisition [Line Items]
Schedule of purchased assets and assumed liabilities	The purchased assets and assumed liabilities were recorded at their acquisition date fair values and are summarized in the table below (in thousands) . As Recorded Fair Value (1) As Recorded by Assets Cash and cash equivalents $ 32,548 $ — $ 32,548 Loans 197,682 (5,188 ) 192,494 Allowance for loan losses (6,338 ) 6,338 — Premises and equipment, net 7,124 1,400 8,524 Bank owned life insurance 6,823 — 6,823 Net deferred tax asset 1,386 (1,229 ) 157 Core deposit intangible — 2,800 2,800 Other assets 1,032 246 1,278 Total assets acquired $ 240,257 $ 4,367 $ 244,624 Liabilities Deposits $ 211,884 $ 243 $ 212,127 Other liabilities 924 (207 ) 717 Total liabilities assumed 212,808 36 212,844 Excess of assets acquired over liabilities assumed $ 27,449 Aggregate fair value adjustments $ 4,331 Total identifiable net assets 31,780 Cash consideration transferred 52,093 Goodwill $ 20,313 (1)
Additional information related to acquired loan portfolio at acquisition date	The following table presents additional information related to the acquired loan portfolio at the acquisition date (in thousands) : May 1, 2019 Accounted for pursuant to ASC 310-30: Contractually required principal and interest $ 13,145 Non-accretable difference 2,517 Cash flows expected to be collected 10,628 Accretable yield 1,300 Fair value $ 9,328 Excluded from ASC 310-30: Fair value $ 183,166 Gross contractual amounts receivable 218,855 Estimate of contractual cash flows not expected to be collected 8,826
Navitas
Business Acquisition [Line Items]
Schedule of purchased assets and assumed liabilities	The purchased assets and assumed liabilities were recorded at their acquisition date fair values and are summarized in the table below (in thousands) . As Recorded by Navitas Fair Value Adjustments As Recorded by United Assets Cash and cash equivalents $ 27,700 — $ 27,700 Loans and leases, net 365,533 (7,181 ) 358,352 Premises and equipment, net 628 (304 ) 324 Net deferred tax asset — 2,873 2,873 Other assets 5,117 (1,066 ) 4,051 Total assets acquired $ 398,978 $ (5,678 ) $ 393,300 Liabilities Short-term borrowings $ 214,923 $ — $ 214,923 Long-term debt 119,402 — 119,402 Other liabilities 17,059 (951 ) 16,108 Total liabilities assumed 351,384 (951 ) 350,433 Excess of assets acquired over liabilities assumed $ 47,594 Aggregate fair value adjustments $ (4,727 ) Total identifiable net assets 42,867 Consideration transferred Cash 84,500 Common stock issued (1,443,987 shares) 45,746 Total fair value of consideration transferred 130,246 Goodwill $ 87,379
Additional information related to acquired loan portfolio at acquisition date	The following table presents additional information related to the acquired loan and lease portfolio at the acquisition date (in thousands) . February 1, 2018 Accounted for pursuant to ASC 310-30: Contractually required principal and interest $ 24,711 Non-accretable difference 5,505 Cash flows expected to be collected 19,206 Accretable yield 1,977 Fair value $ 17,229 Excluded from ASC 310-30: Fair value $ 341,123 Gross contractual amounts receivable 389,432 Estimate of contractual cash flows not expected to be collected 8,624
FOFN
Business Acquisition [Line Items]
Schedule of purchased assets and assumed liabilities	The purchased assets and assumed liabilities were recorded at their acquisition date fair values and are summarized in the table below (in thousands). As Recorded by FOFN Fair Value Adjustments As Recorded by United Assets Cash and cash equivalents $ 48,652 $ 6 $ 48,658 Securities 114,190 782 114,972 Loans held for sale 13,976 (3,290 ) 10,686 Loans, net 491,721 (5,477 ) 486,244 Premises and equipment, net 11,251 1,147 12,398 Bank owned life insurance 20,339 — 20,339 Accrued interest receivable 1,858 (118 ) 1,740 Net deferred tax asset 18,333 (999 ) 17,334 Intangibles — 8,738 8,738 Other real estate owned 1,173 (514 ) 659 Other assets 8,792 (69 ) 8,723 Total assets acquired $ 730,285 $ 206 $ 730,491 Liabilities Deposits $ 563,840 $ 1,365 $ 565,205 Federal Home Loan Bank advances 65,000 224 65,224 Long-term debt 23,872 (4,125 ) 19,747 Other liabilities 7,330 60 7,390 Total liabilities assumed 660,042 (2,476 ) 657,566 Excess of assets acquired over liabilities assumed $ 70,243 Aggregate fair value adjustments $ 2,682 Total identifiable net assets 72,925 Consideration transferred Cash 12,802 Common stock issued (4,145,343 shares) 113,665 Total fair value of consideration transferred 126,467 Goodwill $ 53,542
Additional information related to acquired loan portfolio at acquisition date	The following table presents additional information related to the acquired loan portfolio at the acquisition date (in thousands) : November 1, 2017 Accounted for pursuant to ASC 310-30: Contractually required principal and interest $ 49,377 Non-accretable difference 8,244 Cash flows expected to be collected 41,133 Accretable yield 3,313 Fair value $ 37,820 Excluded from ASC 310-30: Fair value $ 448,462 Gross contractual amounts receivable 509,629 Estimate of contractual cash flows not expected to be collected 6,081
HCSB
Business Acquisition [Line Items]
Schedule of purchased assets and assumed liabilities	The purchased assets and assumed liabilities were recorded at their acquisition date fair values and are summarized in the table below (in thousands) . As Recorded by HCSB Fair Value Adjustments As Recorded by United Assets Cash and cash equivalents $ 17,855 $ (2 ) $ 17,853 Securities 101,462 (142 ) 101,320 Loans, net 228,483 (12,536 ) 215,947 Premises and equipment, net 14,030 (6,606 ) 7,424 Bank owned life insurance 11,827 — 11,827 Accrued interest receivable 1,322 (275 ) 1,047 Net deferred tax asset — 25,579 25,579 Intangibles — 5,716 5,716 Other real estate owned 1,177 (372 ) 805 Other assets 1,950 (32 ) 1,918 Total assets acquired $ 378,106 $ 11,330 $ 389,436 Liabilities Deposits $ 318,512 $ 430 $ 318,942 Repurchase agreements 1,141 — 1,141 Federal Home Loan Bank advances 24,000 517 24,517 Other liabilities 1,955 91 2,046 Total liabilities assumed 345,608 1,038 346,646 Excess of assets acquired over liabilities assumed $ 32,498 Aggregate fair value adjustments $ 10,292 Total identifiable net assets 42,790 Consideration transferred Cash 31 Common stock issued (2,370,331 shares) 65,800 Total fair value of consideration transferred 65,831 Equity interest in HCSB held before the business combination 1,125 Goodwill $ 24,166
Additional information related to acquired loan portfolio at acquisition date	The following table presents additional information related to the acquired loan portfolio at the acquisition date (in thousands) : July 31, 2017 Accounted for pursuant to ASC 310-30: Contractually required principal and interest $ 46,069 Non-accretable difference 12,413 Cash flows expected to be collected 33,656 Accretable yield 3,410 Fair value $ 30,246 Excluded from ASC 310-30: Fair value $ 185,701 Gross contractual amounts receivable 212,780 Estimate of contractual cash flows not expected to be collected 3,985

Balance Sheet Offsetting and _2

Balance Sheet Offsetting and Repurchase Agreements Accounted for as Secured Borrowings (Tables)	12 Months Ended
	Dec. 31, 2019
Offsetting [Abstract]
Schedule of summary of amounts outstanding under reverse repurchase agreements	The following table presents a summary of amounts outstanding under reverse repurchase agreements, of which there were none as of December 31, 2019 , and derivative financial instruments, including those entered into in connection with the same counterparty under master netting agreements, as of the dates indicated (in thousands). Gross Amounts of Recognized Assets Gross Amounts Offset on the Balance Sheet Gross Amounts not Offset in the Balance Sheet December 31, 2019 Net Asset Balance Financial Instruments Collateral Received Net Amount Derivatives $ 35,007 $ — $ 35,007 $ (401 ) $ — $ 34,606 Total $ 35,007 $ — $ 35,007 $ (401 ) $ — $ 34,606 Gross Amounts of Recognized Liabilities Gross Amounts Offset on the Balance Sheet Gross Amounts not Offset in the Balance Sheet Net Liability Balance Financial Instruments Collateral Pledged Net Amount Derivatives $ 15,516 $ — $ 15,516 $ (401 ) $ (14,933 ) $ 182 Total $ 15,516 $ — $ 15,516 $ (401 ) $ (14,933 ) $ 182 Gross Amounts of Recognized Assets Gross Amounts Offset on the Balance Sheet Gross Amounts not Offset in the Balance Sheet December 31, 2018 Net Asset Balance Financial Instruments Collateral Received Net Amount Repurchase agreements / reverse repurchase agreements $ 50,000 $ (50,000 ) $ — $ — $ — $ — Derivatives 24,705 — 24,705 (973 ) (8,029 ) 15,703 Total $ 74,705 $ (50,000 ) $ 24,705 $ (973 ) $ (8,029 ) $ 15,703 Weighted average interest rate of reverse repurchase agreements 3.20 % Gross Amounts of Recognized Liabilities Gross Amounts Offset on the Balance Sheet Gross Amounts not Offset in the Balance Sheet Net Liability Balance Financial Instruments Collateral Pledged Net Amount Repurchase agreements / reverse repurchase agreements $ 50,000 $ (50,000 ) $ — $ — $ — $ — Derivatives 26,433 — 26,433 (973 ) (16,126 ) 9,334 Total $ 76,433 $ (50,000 ) $ 26,433 $ (973 ) $ (16,126 ) $ 9,334 Weighted average interest rate of repurchase agreements 2.45 %
Schedule of repurchase agreements remaining contractual maturity of the agreements	The following table presents additional detail regarding repurchase agreements accounted for as secured borrowings and the securities underlying these agreements as of December 31, 2018 (in thousands) . Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 Days 30 to 90 Days 91 to 110 Days Total As of December 31, 2018 Mortgage-backed securities $ — $ — $ 50,000 $ — $ 50,000 Total $ — $ — $ 50,000 $ — $ 50,000 Gross amount of recognized liabilities for repurchase agreements in offsetting disclosure $ 50,000 Amounts related to agreements not included in offsetting disclosure $ —

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Schedule of cost basis, unrealized gains and losses, and fair value of securities held-to-maturity	The cost basis, unrealized gains and losses, and fair value of debt securities held-to-maturity as of the dates indicated are as follows (in thousands) : Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value As of December 31, 2019 State and political subdivisions $ 45,479 $ 1,574 $ 9 $ 47,044 Residential mortgage-backed securities, Agency 153,967 2,014 694 155,287 Commercial mortgage-backed, Agency 84,087 1,627 141 85,573 Total $ 283,533 $ 5,215 $ 844 $ 287,904 As of December 31, 2018 State and political subdivisions $ 68,551 $ 952 $ 2,191 $ 67,312 Residential mortgage-backed securities, Agency 176,488 652 5,094 172,046 Commercial mortgage-backed, Agency 29,368 173 96 29,445 Total $ 274,407 $ 1,777 $ 7,381 $ 268,803
Schedule of cost basis, unrealized gains and losses, and fair value of securities available for sale	The cost basis, unrealized gains and losses, and fair value of debt securities available-for-sale as of the dates indicated are as follows (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value As of December 31, 2019 U.S. Treasuries $ 152,990 $ 1,628 $ — $ 154,618 U.S. Government agencies 2,848 188 1 3,035 State and political subdivisions 214,677 11,813 — 226,490 Residential mortgage-backed securities, Agency 1,030,948 12,022 726 1,042,244 Residential mortgage-backed securities, Non-agency 250,550 6,231 — 256,781 Commercial mortgage-backed, Agency 266,770 2,261 128 268,903 Commercial mortgage-backed, Non-agency 15,395 918 263 16,050 Corporate bonds 202,131 1,178 218 203,091 Asset-backed securities 104,298 743 1,672 103,369 Total $ 2,240,607 $ 36,982 $ 3,008 $ 2,274,581 As of December 31, 2018 U.S. Treasuries $ 150,712 $ 767 $ 2,172 $ 149,307 U.S. Government agencies 25,493 335 275 25,553 State and political subdivisions 234,750 907 1,716 233,941 Residential mortgage-backed securities, Agency 1,125,194 2,448 20,124 1,107,518 Residential mortgage-backed securities, Non-agency 339,186 980 1,774 338,392 Commercial mortgage-backed, Agency 384,222 1 7,339 376,884 Commercial mortgage-backed, Non-agency 15,441 186 594 15,033 Corporate bonds 200,582 502 1,921 199,163 Asset-backed securities 184,683 328 2,335 182,676 Total $ 2,660,263 $ 6,454 $ 38,250 $ 2,628,467
Schedule of summary of held to maturity securities in an unrealized loss position	The following summarizes debt securities held-to-maturity in an unrealized loss position as of the dates indicated (in thousands) : Less than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of December 31, 2019 State and political subdivisions $ 10,117 $ 9 $ — $ — $ 10,117 $ 9 Residential mortgage-backed securities, Agency 16,049 64 48,237 630 64,286 694 Commercial mortgage-backed, Agency 21,841 87 1,685 54 23,526 141 Total unrealized loss position $ 48,007 $ 160 $ 49,922 $ 684 $ 97,929 $ 844 As of December 31, 2018 State and political subdivisions $ 7,062 $ 46 $ 34,146 $ 2,145 $ 41,208 $ 2,191 Residential mortgage-backed securities, Agency 6,579 61 136,376 5,033 142,955 5,094 Commercial mortgage-backed, Agency — — 4,290 96 4,290 96 Total unrealized loss position $ 13,641 $ 107 $ 174,812 $ 7,274 $ 188,453 $ 7,381
Schedule of summary of available for sale securities in an unrealized loss position	The following summarizes debt securities available-for-sale in an unrealized loss position as of the dates indicated (in thousands) : Less than 12 Months 12 Months or More Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of December 31, 2019 U.S. Government agencies $ 404 $ 1 $ — $ — $ 404 $ 1 Residential mortgage-backed securities, Agency 228,611 576 18,294 150 246,905 726 Commercial mortgage-backed, Agency — — 33,517 128 33,517 128 Commercial mortgage-backed, Non-agency — — 4,864 263 4,864 263 Corporate bonds 19,742 216 998 2 20,740 218 Asset-backed securities 32,294 625 38,990 1,047 71,284 1,672 Total unrealized loss position $ 281,051 $ 1,418 $ 96,663 $ 1,590 $ 377,714 $ 3,008 As of December 31, 2018 U.S. Treasuries $ — $ — $ 120,391 $ 2,172 $ 120,391 $ 2,172 U.S. Government agencies — — 21,519 275 21,519 275 State and political subdivisions 15,160 28 133,500 1,688 148,660 1,716 Residential mortgage-backed securities, Agency 80,202 332 723,094 19,792 803,296 20,124 Residential mortgage-backed securities, Non-agency 154,381 476 52,266 1,298 206,647 1,774 Commercial mortgage-backed, Agency — — 355,292 7,339 355,292 7,339 Commercial mortgage-backed, Non-agency 4,552 594 — — 4,552 594 Corporate bonds — — 117,296 1,921 117,296 1,921 Asset-backed securities 74,492 1,879 31,968 456 106,460 2,335 Total unrealized loss position $ 328,787 $ 3,309 $ 1,555,326 $ 34,941 $ 1,884,113 $ 38,250
Schedule of summary of available-for-sale securities sales activities	Realized gains and losses are derived using the specific identification method for determining the cost of the securities sold. The following summarizes securities sales activities for the years ended December 31 (in thousands) : 2019 2018 2017 Proceeds from sales $ 352,106 $ 168,891 $ 340,540 Gross gains on sales $ 1,843 $ 2,082 $ 1,247 Gross losses on sales (2,864 ) (2,738 ) (1,205 ) Net (losses) gains on sales of securities $ (1,021 ) $ (656 ) $ 42 Income tax (benefit) expense attributable to sales $ (247 ) $ (132 ) $ 14
Schedule of amortized cost and fair value of available for sale and held to maturity securities by contractual maturity	The amortized cost and fair value of debt available-for-sale and held-to-maturity securities at December 31, 2019 , by contractual maturity, are presented in the following table (in thousands) : Available-for-Sale Held-to-Maturity Amortized Cost Fair Value Amortized Cost Fair Value US Treasuries: Within 1 year $ 29,877 $ 29,962 $ — $ — 1 to 5 years 123,113 124,656 — — 152,990 154,618 — — US Government agencies: 1 to 5 years 405 404 — — More than 10 years 2,443 2,631 — — 2,848 3,035 — — State and political subdivisions: Within 1 year 935 939 1,350 1,369 1 to 5 years 54,102 55,491 11,761 12,370 5 to 10 years 22,585 23,766 6,202 6,866 More than 10 years 137,055 146,294 26,166 26,439 214,677 226,490 45,479 47,044 Corporate bonds: Within 1 year 170,007 170,380 — — 1 to 5 years 27,624 28,171 — — 5 to 10 years 3,500 3,542 — — More than 10 years 1,000 998 — — 202,131 203,091 — — Asset-backed securities: 1 to 5 years 1,585 1,578 — — More than 10 years 102,713 101,791 — — 104,298 103,369 — — Total securities other than mortgage-backed securities: Within 1 year 200,819 201,281 1,350 1,369 1 to 5 years 206,829 210,300 11,761 12,370 5 to 10 years 26,085 27,308 6,202 6,866 More than 10 years 243,211 251,714 26,166 26,439 Residential mortgage-backed securities 1,281,498 1,299,025 153,967 155,287 Commercial mortgage-backed securities 282,165 284,953 84,087 85,573 $ 2,240,607 $ 2,274,581 $ 283,533 $ 287,904

Loans and Leases and Allowanc_2

Loans and Leases and Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Schedule of major classifications of loans and lease portfolio	Major classifications of the loan and lease portfolio (collectively referred to as the “loan portfolio” or “loans”) are summarized as of the dates indicated as follows (in thousands) : December 31, 2019 2018 Owner occupied commercial real estate $ 1,720,227 $ 1,647,904 Income producing commercial real estate 2,007,950 1,812,420 Commercial & industrial 1,220,657 1,278,347 Commercial construction 976,215 796,158 Equipment financing 744,544 564,614 Total commercial 6,669,593 6,099,443 Residential mortgage 1,117,616 1,049,232 Home equity lines of credit 660,675 694,010 Residential construction 236,437 211,011 Consumer 128,232 122,013 Indirect auto — 207,692 Total loans 8,812,553 8,383,401 Less allowance for loan losses (62,089 ) (61,203 ) Loans, net $ 8,750,464 $ 8,322,198
Schedule of changes in the value of the accretable yield for PCI loans	The following table presents changes in the value of the accretable yield for PCI loans for the years ended December 31 (in thousands) : 2019 2018 Balance at beginning of period $ 26,868 $ 17,686 Additions due to acquisitions 1,300 1,977 Accretion (17,885 ) (13,696 ) Reclassification from nonaccretable difference 9,237 15,326 Changes in expected cash flows that do not affect nonaccretable difference 4,400 5,575 Balance at end of period $ 23,920 $ 26,868
Schedule of components of net investment in leases	At December 31, 2019 and 2018 , equipment financing assets included leases of $37.4 million and $30.4 million , respectively. The components of the net investment in leases, which included both sales-type and direct financing, are presented below (in thousands) . December 31, 2019 2018 Minimum future lease payments receivable $ 39,709 $ 31,915 Estimated residual value of leased equipment 3,631 3,593 Initial direct costs 842 827 Security deposits (989 ) (1,189 ) Purchase accounting premium 273 806 Unearned income (6,088 ) (5,568 ) Net investment in leases $ 37,378 $ 30,384
Schedule of minimum future lease payments expected to be received from lease contracts	Minimum future lease payments expected to be received from equipment financing lease contracts as of December 31, 2019 are as follows (in thousands) : Year 2020 $ 14,772 2021 11,177 2022 7,549 2023 4,436 2024 1,462 Thereafter 313 Total $ 39,709
Schedule of balance and activity in allowance for credit losses and recorded investment by portfolio segment	The following table presents the recorded investment in loans by portfolio segment and the balance of the allowance for loan losses assigned to each segment based on the method of evaluating the loans for impairment for the periods indicated (in thousands) : Allowance for Credit Losses December 31, 2019 December 31, 2018 Individually evaluated for impairment Collectively evaluated for impairment PCI Ending Balance Individually evaluated for impairment Collectively evaluated for impairment PCI Ending Balance Owner occupied commercial real estate $ 816 $ 10,483 $ 105 $ 11,404 $ 862 $ 11,328 $ 17 $ 12,207 Income producing commercial real estate 770 11,507 29 12,306 402 10,671 — 11,073 Commercial & industrial 21 5,193 52 5,266 32 4,761 9 4,802 Commercial construction 55 9,613 — 9,668 71 9,974 292 10,337 Equipment financing — 7,240 144 7,384 — 5,045 407 5,452 Residential mortgage 782 7,296 3 8,081 861 7,410 24 8,295 Home equity lines of credit 16 4,541 18 4,575 1 4,740 11 4,752 Residential construction 47 2,456 1 2,504 51 2,382 — 2,433 Consumer 5 885 11 901 6 847 — 853 Indirect auto — — — — 26 973 — 999 Total allowance for loan losses 2,512 59,214 363 62,089 2,312 58,131 760 61,203 Allowance for unfunded commitments — 3,458 — 3,458 — 3,410 — 3,410 Total allowance for credit losses $ 2,512 $ 62,672 $ 363 $ 65,547 $ 2,312 $ 61,541 $ 760 $ 64,613 Loans Outstanding December 31, 2019 December 31, 2018 Individually evaluated for impairment Collectively evaluated for impairment PCI Ending Balance Individually evaluated for impairment Collectively evaluated for impairment PCI Ending Balance Owner occupied commercial real estate $ 19,233 $ 1,692,448 $ 8,546 $ 1,720,227 $ 17,602 $ 1,620,450 $ 9,852 $ 1,647,904 Income producing commercial real estate 18,134 1,962,588 27,228 2,007,950 16,584 1,757,525 38,311 1,812,420 Commercial & industrial 1,449 1,218,882 326 1,220,657 1,621 1,276,318 408 1,278,347 Commercial construction 3,675 965,678 6,862 976,215 2,491 787,760 5,907 796,158 Equipment financing 1,027 739,532 3,985 744,544 — 556,672 7,942 564,614 Residential mortgage 15,991 1,092,046 9,579 1,117,616 14,220 1,025,862 9,150 1,049,232 Home equity lines of credit 992 658,273 1,410 660,675 276 692,122 1,612 694,010 Residential construction 1,256 234,807 374 236,437 1,207 209,070 734 211,011 Consumer 214 127,682 336 128,232 211 121,269 533 122,013 Indirect auto — — — — 1,237 206,455 — 207,692 Total loans $ 61,971 $ 8,691,936 $ 58,646 $ 8,812,553 $ 55,449 $ 8,253,503 $ 74,449 $ 8,383,401 The following table presents the balance and activity in the allowance for credit losses by portfolio segment for the periods indicated (in thousands) : Year Ended December 31, 2019 Beginning Balance Charge-Offs Recoveries Provision Ending Balance Owner occupied commercial real estate $ 12,207 $ (5 ) $ 375 $ (1,173 ) $ 11,404 Income producing commercial real estate 11,073 (1,227 ) 283 2,177 12,306 Commercial & industrial 4,802 (5,849 ) 852 5,461 5,266 Commercial construction 10,337 (290 ) 1,165 (1,544 ) 9,668 Equipment financing 5,452 (5,675 ) 781 6,826 7,384 Residential mortgage 8,295 (616 ) 481 (79 ) 8,081 Home equity lines of credit 4,752 (996 ) 610 209 4,575 Residential construction 2,433 (306 ) 157 220 2,504 Consumer 853 (2,390 ) 911 1,527 901 Indirect auto 999 (663 ) 186 (522 ) — Total allowance for loan losses 61,203 (18,017 ) 5,801 13,102 62,089 Allowance for unfunded commitments 3,410 — — 48 3,458 Total allowance for credit losses $ 64,613 $ (18,017 ) $ 5,801 $ 13,150 $ 65,547 Year Ended December 31, 2018 Beginning Balance Charge-Offs Recoveries Provision Ending Balance Owner occupied commercial real estate $ 14,776 $ (303 ) $ 1,227 $ (3,493 ) $ 12,207 Income producing commercial real estate 9,381 (3,304 ) 1,064 3,932 11,073 Commercial & industrial 3,971 (1,669 ) 1,390 1,110 4,802 Commercial construction 10,523 (622 ) 734 (298 ) 10,337 Equipment financing — (1,536 ) 460 6,528 5,452 Residential mortgage 10,097 (754 ) 336 (1,384 ) 8,295 Home equity lines of credit 5,177 (1,194 ) 423 346 4,752 Residential construction 2,729 (54 ) 376 (618 ) 2,433 Consumer 710 (2,445 ) 807 1,781 853 Indirect auto 1,550 (1,277 ) 228 498 999 Total allowance for loan losses 58,914 (13,158 ) 7,045 8,402 61,203 Allowance for unfunded commitments 2,312 — — 1,098 3,410 Total allowance for credit losses $ 61,226 $ (13,158 ) $ 7,045 $ 9,500 $ 64,613 Year Ended December 31, 2017 Beginning Balance Charge-Offs Recoveries Provision Ending Balance Owner occupied commercial real estate $ 16,446 $ (406 ) $ 980 $ (2,244 ) $ 14,776 Income producing commercial real estate 8,843 (2,985 ) 178 3,345 9,381 Commercial & industrial 3,810 (1,528 ) 1,768 (79 ) 3,971 Commercial construction 13,405 (1,023 ) 1,018 (2,877 ) 10,523 Equipment financing — — — — — Residential mortgage 8,545 (1,473 ) 314 2,711 10,097 Home equity lines of credit 4,599 (1,435 ) 567 1,446 5,177 Residential construction 3,264 (129 ) 178 (584 ) 2,729 Consumer 708 (1,803 ) 917 888 710 Indirect auto 1,802 (1,420 ) 284 884 1,550 Total allowance for loan losses 61,422 (12,202 ) 6,204 3,490 58,914 Allowance for unfunded commitments 2,002 — — 310 2,312 Total allowance for credit losses $ 63,424 $ (12,202 ) $ 6,204 $ 3,800 $ 61,226
Schedule of loans individually evaluated for impairment by class of loans	The following table presents loans individually evaluated for impairment by class of loans as of the dates indicated (in thousands) : December 31, 2019 December 31, 2018 Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated Unpaid Principal Balance Recorded Investment Allowance for Loan Losses Allocated With no related allowance recorded: Owner occupied commercial real estate $ 9,527 $ 8,118 $ — $ 8,650 $ 6,546 $ — Income producing commercial real estate 5,159 4,956 — 9,986 9,881 — Commercial & industrial 1,144 890 — 525 370 — Commercial construction 2,458 2,140 — 685 507 — Equipment financing 1,027 1,027 — — — — Total commercial 19,315 17,131 — 19,846 17,304 — Residential mortgage 7,362 6,436 — 5,787 5,202 — Home equity lines of credit 1,116 861 — 330 234 — Residential construction 731 626 — 554 428 — Consumer 66 53 — 18 17 — Indirect auto — — — 294 292 — Total with no related allowance recorded 28,590 25,107 — 26,829 23,477 — With an allowance recorded: Owner occupied commercial real estate 11,136 11,115 816 11,095 11,056 862 Income producing commercial real estate 13,591 13,178 770 6,968 6,703 402 Commercial & industrial 559 559 21 1,652 1,251 32 Commercial construction 1,535 1,535 55 2,130 1,984 71 Equipment financing — — — — — — Total commercial 26,821 26,387 1,662 21,845 20,994 1,367 Residential mortgage 9,624 9,555 782 9,169 9,018 861 Home equity lines of credit 146 131 16 45 42 1 Residential construction 643 630 47 791 779 51 Consumer 161 161 5 199 194 6 Indirect auto — — — 946 945 26 Total with an allowance recorded 37,395 36,864 2,512 32,995 31,972 2,312 Total $ 65,985 $ 61,971 $ 2,512 $ 59,824 $ 55,449 $ 2,312
Schedule of loans modified under the terms of a TDR	Loans modified under the terms of a TDR during the years ended December 31 are presented in the table below. In addition, the following table presents loans modified under the terms of a TDR that defaulted (became 90 days or more delinquent) during the years ended December 31 that were initially restructured within one year prior to default (dollars in thousands) : New TDRs Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment by Type of Modification TDRs Modified Within the Year That Have Subsequently Defaulted Year Ended December 31, 2019 Rate Reduction Structure Other Total Number of Contracts Recorded Investment Owner occupied commercial real estate 4 $ 1,864 $ — $ 1,739 $ — $ 1,739 — $ — Income producing commercial real estate 3 9,126 — 9,013 — 9,013 — — Commercial & industrial 2 136 — 75 7 82 — — Commercial construction — — — — — — — — Equipment financing 9 1,071 — 1,071 — 1,071 — — Total commercial 18 12,197 — 11,898 7 11,905 — — Residential mortgage 15 2,102 — 2,057 — 2,057 1 135 Home equity lines of credit 1 50 — 50 — 50 — — Residential construction 1 22 — — 21 21 1 13 Consumer 5 46 — — 45 45 — — Indirect auto 15 271 — — 262 262 — — Total loans 55 $ 14,688 $ — $ 14,005 $ 335 $ 14,340 2 $ 148 Year Ended December 31, 2018 Owner occupied commercial real estate 5 $ 1,438 $ — $ 1,387 $ — $ 1,387 3 $ 1,869 Income producing commercial real estate 2 3,753 106 3,637 — 3,743 — — Commercial & industrial 2 108 — 32 — 32 1 232 Commercial construction — — — — — — 1 3 Equipment financing — — — — — — — — Total commercial 9 5,299 106 5,056 — 5,162 5 2,104 Residential mortgage 15 1,933 130 1,770 — 1,900 1 101 Home equity lines of credit 1 42 — — 41 41 — — Residential construction 2 47 — 32 13 45 — — Consumer 2 7 — — 7 7 — — Indirect auto 35 643 — — 643 643 — — Total loans 64 $ 7,971 $ 236 $ 6,858 $ 704 $ 7,798 6 $ 2,205 Year Ended December 31, 2017 Owner occupied commercial real estate 6 $ 2,603 $ — $ 2,161 $ 108 $ 2,269 — $ — Income producing commercial real estate 2 257 — — 252 252 — — Commercial & industrial 6 901 — 174 533 707 — — Commercial construction — — — — — — — — Equipment financing — — — — — — — — Total commercial 14 3,761 — 2,335 893 3,228 — — Residential mortgage 23 2,174 — 2,165 — 2,165 4 852 Home equity lines of credit 1 296 — — 176 176 — — Residential construction 4 135 40 95 — 135 — — Consumer 2 16 — 16 — 16 — — Indirect auto 34 786 — — 786 786 — — Total loans 78 $ 7,168 $ 40 $ 4,611 $ 1,855 $ 6,506 4 $ 852
Schedule of average balances of impaired loans and income recognized on impaired loans	The average balances of impaired loans and income recognized on impaired loans while they were considered impaired is presented below for the last three years (in thousands) : 2019 2018 2017 Average Balance Interest Revenue Recognized During Impairment Cash Basis Interest Revenue Received Average Balance Interest Revenue Recognized During Impairment Cash Basis Interest Revenue Received Average Balance Interest Revenue Recognized During Impairment Cash Basis Interest Revenue Received Owner occupied commercial real estate $ 18,575 $ 1,124 $ 1,171 $ 19,881 $ 1,078 $ 1,119 $ 27,870 $ 1,271 $ 1,291 Income producing commercial real estate 14,253 739 730 17,138 893 895 24,765 1,265 1,178 Commercial & industrial 1,837 84 100 1,777 100 100 2,994 125 127 Commercial construction 3,233 129 146 3,247 176 174 5,102 225 229 Equipment financing 159 23 23 — — — — — — Total commercial 38,057 2,099 2,170 42,043 2,247 2,288 60,731 2,886 2,825 Residential mortgage 16,115 748 749 14,515 641 643 14,257 555 574 Home equity lines of credit 488 14 15 284 18 16 248 10 12 Residential construction 1,332 92 94 1,405 96 95 1,582 95 95 Consumer 203 15 15 249 18 18 292 22 22 Indirect auto 1,028 50 50 1,252 64 64 1,244 64 64 Total $ 57,223 $ 3,018 $ 3,093 $ 59,748 $ 3,084 $ 3,124 $ 78,354 $ 3,632 $ 3,592
Schedule of recorded investment in nonaccrual loans held for investment by loan class	The following table presents the recorded investment in nonaccrual loans held for investment by loan class as of the dates indicated (in thousands) : December 31, 2019 2018 Owner occupied commercial real estate $ 10,544 $ 6,421 Income producing commercial real estate 1,996 1,160 Commercial & industrial 2,545 1,417 Commercial construction 2,277 605 Equipment financing 3,141 2,677 Total commercial 20,503 12,280 Residential mortgage 10,567 8,035 Home equity lines of credit 3,173 2,360 Residential construction 939 288 Consumer 159 89 Indirect auto — 726 Total $ 35,341 $ 23,778
Schedule of aging of the recorded investment in past due loans	The following table presents the aging of the recorded investment in past due loans by class of loans as of the dates indicated (in thousands) : Loans Past Due 30 - 59 Days 60 - 89 Days > 90 Days Total Loans Not Past Due PCI Loans Total As of December 31, 2019 Owner occupied commercial real estate $ 2,913 $ 2,007 $ 6,079 $ 10,999 $ 1,700,682 $ 8,546 $ 1,720,227 Income producing commercial real estate 562 706 401 1,669 1,979,053 27,228 2,007,950 Commercial & industrial 2,140 491 2,119 4,750 1,215,581 326 1,220,657 Commercial construction 1,867 557 96 2,520 966,833 6,862 976,215 Equipment financing 2,065 923 3,045 6,033 734,526 3,985 744,544 Total commercial 9,547 4,684 11,740 25,971 6,596,675 46,947 6,669,593 Residential mortgage 5,655 2,212 2,171 10,038 1,097,999 9,579 1,117,616 Home equity lines of credit 1,697 421 1,385 3,503 655,762 1,410 660,675 Residential construction 325 125 402 852 235,211 374 236,437 Consumer 668 181 27 876 127,020 336 128,232 Total loans $ 17,892 $ 7,623 $ 15,725 $ 41,240 $ 8,712,667 $ 58,646 $ 8,812,553 As of December 31, 2018 Owner occupied commercial real estate $ 2,542 $ 2,897 $ 1,011 $ 6,450 $ 1,631,602 $ 9,852 $ 1,647,904 Income producing commercial real estate 1,624 291 301 2,216 1,771,893 38,311 1,812,420 Commercial & industrial 7,189 718 400 8,307 1,269,632 408 1,278,347 Commercial construction 267 — 68 335 789,916 5,907 796,158 Equipment financing 1,351 739 2,658 4,748 551,924 7,942 564,614 Total commercial 12,973 4,645 4,438 22,056 6,014,967 62,420 6,099,443 Residential mortgage 5,461 1,788 1,950 9,199 1,030,883 9,150 1,049,232 Home equity lines of credit 2,112 864 902 3,878 688,520 1,612 694,010 Residential construction 509 63 190 762 209,515 734 211,011 Consumer 600 82 21 703 120,777 533 122,013 Indirect auto 750 323 633 1,706 205,986 — 207,692 Total loans $ 22,405 $ 7,765 $ 8,134 $ 38,304 $ 8,270,648 $ 74,449 $ 8,383,401
Schedule of risk category of loans by class of loans	As of December 31, and based on the most recent analysis performed, the risk category of loans by class of loans is as follows (in thousands) : Pass Watch Substandard Doubtful / Loss Total As of December 31, 2019 Owner occupied commercial real estate $ 1,638,398 $ 24,563 $ 48,720 $ — $ 1,711,681 Income producing commercial real estate 1,914,524 40,676 25,522 — 1,980,722 Commercial & industrial 1,156,366 16,385 47,580 — 1,220,331 Commercial construction 960,251 2,298 6,804 — 969,353 Equipment financing 737,418 — 3,141 — 740,559 Total commercial 6,406,957 83,922 131,767 — 6,622,646 Residential mortgage 1,093,902 — 14,135 — 1,108,037 Home equity lines of credit 654,619 — 4,646 — 659,265 Residential construction 234,791 — 1,272 — 236,063 Consumer 127,507 8 381 — 127,896 Total loans, excluding PCI loans 8,517,776 83,930 152,201 — 8,753,907 Owner occupied commercial real estate 3,238 2,797 2,511 — 8,546 Income producing commercial real estate 19,648 6,305 1,275 — 27,228 Commercial & industrial 104 81 141 — 326 Commercial construction 3,628 590 2,644 — 6,862 Equipment financing 3,952 — 33 — 3,985 Total commercial 30,570 9,773 6,604 — 46,947 Residential mortgage 8,112 — 1,467 — 9,579 Home equity lines of credit 1,350 — 60 — 1,410 Residential construction 348 — 26 — 374 Consumer 303 — 33 — 336 Total PCI loans 40,683 9,773 8,190 — 58,646 Total loan portfolio $ 8,558,459 $ 93,703 $ 160,391 $ — $ 8,812,553 As of December 31, 2018 Owner occupied commercial real estate $ 1,585,797 $ 16,651 $ 35,604 $ — $ 1,638,052 Income producing commercial real estate 1,735,456 20,923 17,730 — 1,774,109 Commercial & industrial 1,247,206 8,430 22,303 — 1,277,939 Commercial construction 777,780 4,533 7,938 — 790,251 Equipment financing 553,995 — 2,677 — 556,672 Total commercial 5,900,234 50,537 86,252 — 6,037,023 Residential mortgage 1,028,660 — 11,422 — 1,040,082 Home equity lines of credit 688,493 — 3,905 — 692,398 Residential construction 209,744 — 533 — 210,277 Consumer 121,247 19 214 — 121,480 Indirect auto 205,632 — 2,060 — 207,692 Total loans, excluding PCI loans 8,154,010 50,556 104,386 — 8,308,952 Owner occupied commercial real estate 3,352 2,774 3,726 — 9,852 Income producing commercial real estate 23,430 13,403 1,478 — 38,311 Commercial & industrial 266 48 94 — 408 Commercial construction 3,503 188 2,216 — 5,907 Equipment financing 7,725 — 217 — 7,942 Total commercial 38,276 16,413 7,731 — 62,420 Residential mortgage 6,914 — 2,236 — 9,150 Home equity lines of credit 1,492 — 120 — 1,612 Residential construction 687 — 47 — 734 Consumer 493 — 40 — 533 Indirect auto — — — — — Total PCI loans 47,862 16,413 10,174 — 74,449 Total loan portfolio $ 8,201,872 $ 66,969 $ 114,560 $ — $ 8,383,401

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Schedule of premises and equipment	Premises and equipment are summarized as follows as of the dates indicated (in thousands) : December 31, 2019 2018 Land and land improvements $ 81,150 $ 78,066 Buildings and improvements 170,629 153,980 Furniture and equipment 97,997 93,854 Construction in progress 1,701 5,350 351,477 331,250 Less accumulated depreciation (135,501 ) (125,110 ) Premises and equipment, net $ 215,976 $ 206,140

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of carrying amount of goodwill and other intangible assets	The carrying amount of goodwill and other intangible assets is summarized below as of the dates indicated (in thousands) : December 31, 2019 2018 Core deposit intangible (1) $ 32,802 $ 62,652 Less: accumulated amortization (1) (17,980 ) (46,141 ) Net core deposit intangible 14,822 16,511 Noncompete agreement 3,144 3,144 Less: accumulated amortization (3,144 ) (2,695 ) Net noncompete agreement — 449 Total intangibles subject to amortization, net 14,822 16,960 Goodwill 327,425 307,112 Total goodwill and other intangible assets, net $ 342,247 $ 324,072 (1) Balances for 2019 exclude fully amortized core deposit intangibles.
Schedule of changes in the carrying amounts of goodwill	The following is a summary of changes in the carrying amounts of goodwill for the years indicated (in thousands) : Goodwill (1) December 31, 2017 $ 220,591 Acquisition of Navitas 87,379 Measurement period adjustments - FOFN and HCSB (858 ) December 31, 2018 307,112 Acquisition of FMBT 20,313 December 31, 2019 $ 327,425 (1) Goodwill balances presented as of December 31, 2019, 2018, and 2017 are shown net of accumulated impairment losses of $306 million incurred prior to 2017. Gross goodwill for December 31, 2019, 2018, and 2017 totaled $633 million , $613 million and $526 million , respectively.
Schedule of amortization expense for future periods	The estimated aggregate amortization expense for future periods for core deposit intangibles is as follows (in thousands) : Year 2020 $ 3,842 2021 3,019 2022 2,379 2023 1,852 2024 1,431 Thereafter 2,299 Total $ 14,822

Servicing Assets and Liabilit_2

Servicing Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Transfers and Servicing [Abstract]
Schedule of changes in the balances of servicing assets and servicing liabilities	The following table summarizes the changes in SBA/USDA servicing rights for the years indicated ( in thousands ) 2019 2018 2017 Servicing rights for SBA/USDA loans, beginning of period $ 7,510 $ 7,740 $ 5,752 Additions: Acquired servicing rights (1) — (354 ) 419 Originated servicing rights capitalized upon sale of loans 1,835 2,573 2,737 Subtractions: Disposals (1,258 ) (810 ) (621 ) Changes in fair value: Due to change in inputs or assumptions used in the valuation model (1,293 ) (1,639 ) (547 ) Servicing rights for SBA/USDA loans, end of period $ 6,794 $ 7,510 $ 7,740 (1) Includes measurement period adjustments further discussed in Note 3.
Schedule of key characteristics, inputs, and economic assumptions used to estimate the fair value of SBA Servicing Asset	A summary of the key characteristics, inputs, and economic assumptions used in the discounted cash flow method utilized to estimate the fair value of the servicing asset for SBA/USDA loans and the sensitivity of the fair values to immediate adverse changes in those assumptions are shown in the table below as of the dates indicated (dollars in thousands) : December 31, 2019 2018 Fair value of retained servicing assets $ 6,794 $ 7,510 Prepayment rate assumption 16.5 % 12.1 % 10% adverse change $ (352 ) $ (267 ) 20% adverse change $ (671 ) $ (515 ) Discount rate 12.3 % 14.5 % 100 bps adverse change $ (184 ) $ (196 ) 200 bps adverse change $ (358 ) $ (381 ) Weighted-average life (years) 3.9 5.0 Weighted-average gross margin 1.9 % 1.9 %
Schedule of changes in residential mortgage servicing rights	The following table summarizes the changes in residential mortgage servicing rights for the years indicated ( in thousands ). 2019 2018 2017 Residential mortgage servicing rights, beginning of period $ 11,877 $ 8,262 $ 4,372 Additions: Originated servicing rights capitalized upon sale of loans 5,783 4,587 3,602 Subtractions: Disposals (1,098 ) (537 ) (328 ) Changes in fair value: Initial election to carry at fair value on January 1, 2017 — — 698 Due to change in inputs or assumptions used in the valuation (2,997 ) (435 ) (82 ) Residential mortgage servicing rights, end of period $ 13,565 $ 11,877 $ 8,262
Schedule of characteristics, inputs, and economic assumptions used to estimatefair value of servicing asset for residential mortgage loans sensitivity of adverse changes	A summary of the key characteristics, inputs, and economic assumptions used to estimate the fair value of the servicing asset for residential mortgage loans and the sensitivity of the fair values to immediate adverse changes in those assumptions are shown in the table below as of the dates indicated (in thousands) : December 31, 2019 2018 Fair value of retained servicing assets $ 13,565 $ 11,877 Prepayment rate assumption 14.1 % 10.6 % 10% adverse change $ (662 ) $ (466 ) 20% adverse change $ (1,270 ) $ (898 ) Discount rate 10.0 % 10.0 % 100 bps adverse change $ (467 ) $ (448 ) 200 bps adverse change $ (900 ) $ (863 )

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2019
Deposits [Abstract]
Schedule of contractual maturities of time deposits, including brokered time deposits	At December 31, 2019 , the contractual maturities of time deposits, including brokered time deposits, are summarized as follows (in thousands) : 2020 $ 1,639,355 2021 187,367 2022 41,402 2023 12,451 2024 8,064 thereafter 56,444 Total time deposits $ 1,945,083

Long-term Debt (Tables)

Long-term Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of long-term debt	Long-term debt consisted of the following (in thousands) : December 31, Issue Date Stated Maturity Date Earliest Call Date 2019 2018 Interest Rate Obligations of the Bank and its Subsidiaries: NER 16-1 Class A-2 notes $ — $ 19,975 2016 2021 n/a 2.20% NER 16-1 Class B notes — 25,489 2016 2021 n/a 3.22% NER 16-1 Class C notes — 6,319 2016 2021 n/a 5.05% NER 16-1 Class D notes — 3,213 2016 2023 n/a 7.87% Total securitized notes payable — 54,996 Obligations of the Holding Company: 2022 senior debentures 50,000 50,000 2015 2022 2020 5.000% through August 13, 2020, 3-month LIBOR plus 3.814% thereafter 2027 senior debentures 35,000 35,000 2015 2027 2025 5.500% through August 13, 2025, 3-month LIBOR plus 3.71% thereafter Total senior debentures 85,000 85,000 2028 subordinated debentures 100,000 100,000 2018 2028 2023 4.500% through January 30, 2023, 3-month LIBOR plus 2.12% thereafter 2025 subordinated debentures 11,250 11,500 2015 2025 2020 6.250% Total subordinated debentures 111,250 111,500 Southern Bancorp Capital Trust I 4,382 4,382 2004 2034 2009 Prime + 1.00% Tidelands Statutory Trust I 8,248 8,248 2006 2036 2011 3-month LIBOR plus 1.38% Four Oaks Statutory Trust I 12,372 12,372 2006 2036 2011 3-month LIBOR plus 1.35% Total trust preferred securities 25,002 25,002 Less discount (8,588 ) (9,309 ) Total long-term debt $ 212,664 $ 267,189

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Schedule of operating lease income and expense and other supplemental information	The table below presents the operating lease income and expense recognized for the year ended December 31, 2019 (in thousands) . 2019 Income Statement Location Operating lease cost $ 5,067 Occupancy expense Variable lease cost 449 Occupancy expense Short-term lease cost 136 Occupancy expense Total lease cost $ 5,652 Sublease income and rental income from owned properties under operating leases $ 1,160 Other noninterest income
Schedule of future minimum lease payments under operating leases	As of December 31, 2019 , future minimum lease payments under operating leases were as follows (in thousands) : Year 2020 $ 4,939 2021 5,124 2022 4,694 2023 3,992 2024 1,728 Thereafter 3,364 Total 23,841 Less discount (1,802 ) Present value of lease liability $ 22,039

Reclassifications Out of Accu_2

Reclassifications Out of Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2019
Equity [Abstract]
Schedule of details regarding amounts reclassified out of accumulated other comprehensive income	The following presents the details regarding amounts reclassified out of accumulated other comprehensive income (in thousands). Amounts Reclassified from Accumulated Other Comprehensive Income For the Years Ended December 31, Details about Accumulated Other Comprehensive Income Components Affected Line Item in the Statement Where Net Income is Presented 2019 2018 2017 Realized (losses) gains on available-for-sale securities: $ (1,021 ) $ (656 ) $ 42 Securities (losses) gains, net 247 132 (14 ) Income tax benefit (expense) $ (774 ) $ (524 ) $ 28 Net of tax Amortization of losses included in net income on available-for-sale securities transferred to held to maturity: $ (383 ) $ (739 ) $ (1,069 ) Investment securities interest revenue 92 180 401 Income tax benefit $ (291 ) $ (559 ) $ (668 ) Net of tax Amortization of losses included in net income on terminated derivative financial instruments previously accounted for as cash flow hedges: $ (235 ) $ — $ — Other expense (102 ) (499 ) (599 ) Deposit interest expense — — (292 ) Federal Home Loan Bank advances interest expense (337 ) (499 ) (891 ) Total before tax 86 129 346 Income tax benefit $ (251 ) $ (370 ) $ (545 ) Net of tax Reclassification of disproportionate tax effect related to terminated and current cash flow hedges: $ — $ — $ (3,289 ) Income tax expense Reclassifications related to defined benefit pension plan activity: Prior service cost $ (640 ) $ (666 ) $ (560 ) Salaries and employee benefits expense Actuarial losses (59 ) (241 ) — Other expense Actuarial losses — — (238 ) Salaries and employee benefits expense Termination of defined benefit pension plan (1,558 ) — — Merger-related and other (2,257 ) (907 ) (798 ) Total before tax 576 247 310 Income tax benefit $ (1,681 ) $ (660 ) $ (488 ) Net of tax Total reclassifications for the period $ (2,997 ) $ (2,113 ) $ (4,962 ) Net of tax Amounts shown above in parentheses reduce earnings

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Schedule of computation of basic and diluted net income per common share	The following table sets forth the computation of basic and diluted net income per common share for the years indicated (in thousands, except per share data) : Year Ended December 31, 2019 2018 2017 Net income $ 185,721 $ 166,111 $ 67,821 Dividends and undistributed earnings allocated to unvested shares (1,375 ) (1,184 ) (571 ) Net income available to common stockholders $ 184,346 $ 164,927 $ 67,250 Income per common share: Basic $ 2.31 $ 2.07 $ 0.92 Diluted 2.31 2.07 0.92 Weighted average common shares: Basic 79,700 79,662 73,247 Effect of dilutive securities: Stock options 1 7 12 Restricted stock units 7 2 — Diluted 79,708 79,671 73,259

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Schedule of income tax expense	Income tax expense is as follows for the years indicated (in thousands) : Year Ended December 31, 2019 2018 2017 Current $ 38,082 $ 17,185 $ 5,451 Deferred 14,909 32,630 60,951 Increase in valuation allowance — — 413 Expense due to enactment of federal tax reform — — 38,198 Total income tax expense $ 52,991 $ 49,815 $ 105,013
Schedule of differences between the provision for income taxes and statutory federal income tax rate	The differences between the provision for income taxes and the amount computed by applying the statutory federal income tax rate of 21% in 2019 and 2018 and 35% in 2017 to income before income taxes are as follows for the years indicated (in thousands) : Year Ended December 31, 2019 2018 2017 Pretax income at statutory rates $ 50,130 $ 45,344 $ 60,492 Add (deduct): State taxes, net of federal benefit 7,168 6,765 4,139 Bank owned life insurance earnings (1,127 ) (747 ) (1,141 ) Adjustment to reserve for uncertain tax positions 84 80 59 Tax-exempt interest revenue (1,827 ) (1,229 ) (1,199 ) Equity compensation (375 ) (892 ) (799 ) Transaction costs 16 78 408 Tax credit investments (464 ) (29 ) (89 ) Change in state statutory tax rate — 583 81 Increase in valuation allowance — — 413 Release of disproportionate tax effects related to de-designated cash flow hedges — — 3,400 Expense due to enactment of federal tax reform — — 38,198 Other (614 ) (138 ) 1,051 Total income tax expense $ 52,991 $ 49,815 $ 105,013
Schedule of summarizes the sources and expected tax consequences of future taxable deductions (revenue)	The following summarizes the sources and expected tax consequences of future taxable deductions (revenue) which comprise the net deferred tax asset as of the dates indicated (in thousands) : December 31, 2019 2018 Deferred tax assets: Allowance for loan losses $ 14,910 $ 14,604 Net operating loss carryforwards 27,568 39,204 Deferred compensation 9,363 8,535 Loan purchase accounting adjustments 6,599 8,658 Reserve for losses on foreclosed properties 20 61 Nonqualified share based compensation 2,041 1,190 Accrued expenses 3,958 3,536 Investment in partnerships 67 426 Unamortized pension actuarial losses and prior service cost 1,739 1,606 Unrealized losses on securities available-for-sale — 8,092 Unrealized losses on cash flow hedges — 86 Lease liability 5,327 — Other 2,038 1,235 Total deferred tax assets 73,630 87,233 Deferred tax liabilities: Unrealized gains on securities available-for-sale 7,943 — Acquired intangible assets 2,530 2,772 Premises and equipment 3,002 1,291 Loan origination costs 3,538 3,734 True tax leases 7,783 6,020 Prepaid expenses 373 398 Servicing assets 4,428 2,862 Derivatives 1,075 525 Right-of-use asset 4,809 — Uncertain tax positions 1,792 2,036 Total deferred tax liabilities 37,273 19,638 Less valuation allowance 2,298 3,371 Net deferred tax asset $ 34,059 $ 64,224
Schedule of reconciliation of the beginning and ending unrecognized tax benefit related to uncertain tax positions	A reconciliation of the beginning and ending unrecognized tax benefit related to uncertain tax positions is as follows for the years indicated (in thousands) : 2019 2018 2017 Balance at beginning of year $ 3,264 $ 3,163 $ 3,892 Additions based on tax positions related to the current year 481 470 441 Decreases resulting from a lapse in the applicable statute of limitations (375 ) (369 ) (351 ) Remeasurement due to enactment of federal tax reform — — (819 ) Balance at end of year $ 3,370 $ 3,264 $ 3,163

Pension and Employee Benefit _2

Pension and Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Schedule of weighted-average assumptions used to determine pension benefit obligations	Weighted-average assumptions used to determine pension benefit obligations at year end and net periodic pension cost are shown in the table below: 2019 2018 Modified Retirement Plan Modified Retirement Plan Funded Plan Discount rate for disclosures 3.25 % 4.40 % Various Discount rate for net periodic benefit cost 4.40 % 3.75 % 3.75 % Expected long-term rate of return N/A N/A 4.00 % Rate of compensation increase N/A N/A N/A Measurement date 12/31/2019 12/31/2018 12/31/2018
Schedule of changes in obligations and plan assets	United recognizes the underfunded status of the plans as a liability in the consolidated balance sheets. Information about changes in obligations and plan assets follows (in thousands) : 2019 2018 Modified Retirement Plan Funded Plan Modified Retirement Plan Funded Plan Accumulated benefit obligation: Accumulated benefit obligation - beginning of year $ 21,736 $ 16,011 $ 21,705 $ 17,700 Service cost 392 — 363 — Interest cost 931 166 801 647 Plan amendments 386 — 412 — Actuarial (gains) losses 2,390 1,489 (949 ) (839 ) Benefits paid (730 ) (17,666 ) (596 ) (1,497 ) Accumulated benefit obligation - end of year 25,105 — 21,736 16,011 Change in plan assets, at fair value: Beginning plan assets — 12,595 — 14,308 Actual return — 173 — (216 ) Employer contribution 730 4,898 596 — Benefits paid (730 ) (17,666 ) (596 ) (1,497 ) Plan assets - end of year — — — 12,595 Funded status - end of year (plan assets less benefit obligations) $ (25,105 ) $ — $ (21,736 ) $ (3,416 )
Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive income	Components of net periodic benefit cost and other amounts recognized in other comprehensive income are as follows (in thousands): 2019 2018 2017 Modified Retirement Plan Funded Plan Modified Retirement Plan Funded Plan Modified Retirement Plan Funded Plan Service cost $ 392 $ — $ 363 $ — $ 551 $ — Interest cost 931 166 801 647 778 738 Expected return on plan assets — (106 ) — (551 ) — (630 ) Amortization of prior service cost 635 — 666 — 560 — Amortization of net losses 59 — 241 — 238 — Net periodic benefit cost $ 2,017 $ 60 $ 2,071 $ 96 $ 2,127 $ 108
Schedule of estimated future benefit payments	The following table summarizes the estimated future benefit payments expected to be paid from the Modified Retirement Plan for the periods indicated (in thousands) . 2020 $ 1,301 2021 1,176 2022 1,170 2023 1,164 2024 1,156 2025-2029 7,133
Schedule of funded plan assets	The following table summarizes the Funded Plan assets by major category as of the December 31, 2018, aggregated by the level in the fair value hierarchy within which those measurements fall (in thousands) . Level 1 Level 2 Level 3 Total Money market fund $ — $ 1,033 $ — $ 1,033 Mutual funds 4,881 — — 4,881 Corporate stocks 4,465 — — 4,465 Exchange traded funds 2,216 — — 2,216 Total plan assets $ 11,562 $ 1,033 $ — $ 12,595

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of derivative financial instruments on consolidated balance sheet	Derivatives designated as hedging instruments December 31, Interest Rate Products Balance Sheet Location 2019 2018 Fair value hedge of brokered CDs Derivative liabilities $ 880 $ 1,682 $ 880 $ 1,682 Derivatives not designated as hedging instruments December 31, Interest Rate Products Balance Sheet Location 2019 2018 Customer derivative positions Derivative assets $ 27,277 $ 5,216 Dealer offsets to customer derivative positions Derivative assets 394 7,620 Mortgage banking - loan commitment Derivative assets 1,970 1,190 Mortgage banking - forward sales commitment Derivative assets 98 28 Bifurcated embedded derivatives Derivative assets 5,268 10,651 $ 35,007 $ 24,705 Customer derivative positions Derivative liabilities $ 446 $ 9,661 Dealer offsets to customer derivative positions Derivative liabilities 6,425 781 Risk participations Derivative liabilities 12 8 Mortgage banking - forward sales commitment Derivative liabilities 86 259 Dealer offsets to bifurcated embedded derivatives Derivative liabilities 7,667 13,339 De-designated hedges Derivative liabilities — 703 $ 14,636 $ 24,751
Schedule of effect of fair value hedging on consolidated statements of income	The table below presents the effect of derivatives in fair value hedging relationships on the consolidated statements of income (in thousands) . Year Ended December 31, 2019 2018 2017 Interest expense - deposits Interest expense - deposits Interest revenue - taxable investment securities Other noninterest income Interest expense - deposits Interest revenue - taxable investment securities Total amounts presented in the $ 66,856 $ 39,543 $ 73,496 $ 24,142 $ 17,062 $ 70,172 Gains (losses) on fair value hedging Interest rate contracts: Amounts related to interest settlements (327 ) (245 ) 17 — 160 (302 ) Recognized on derivatives 733 (220 ) — 356 (657 ) 72 Recognized on hedged items (766 ) (145 ) — (447 ) 371 (265 ) Net income (expense) recognized on fair $ (360 ) $ (610 ) $ 17 $ (91 ) $ (126 ) $ (495 )
Schedule of carrying amount and cumulative fair value hedging adjustments on hedged liability	The table below presents the carrying amount of hedged fixed-rate brokered time deposits and cumulative fair value hedging adjustments included in the carrying amount of the hedged liability for the periods presented (in thousands) . December 31, 2019 2018 Balance Sheet Location Carrying amount of Assets (Liabilities) Hedge Accounting Basis Adjustment Carrying amount of Assets (Liabilities) Hedge Accounting Basis Adjustment Deposits $ (35,880 ) $ 645 $ (35,776 ) $ 1,838
Schedule of gains and losses recognized in income on derivatives not designated as hedging instruments	The table below presents the gains and losses recognized in income on derivatives not designated as hedging instruments for the periods indicated (in thousands) . Income Statement Location Year Ended December 31, 2019 2018 2017 Customer derivatives and dealer offsets Other noninterest income $ 2,878 $ 2,658 $ 2,416 Bifurcated embedded derivatives and dealer offsets Other noninterest income 212 307 429 Interest rate caps Other noninterest income — 501 252 De-designated hedges Other noninterest income (193 ) 31 (62 ) Mortgage banking derivatives Mortgage loan revenue (1,797 ) 904 (676 ) Risk participations Other noninterest income (3 ) 12 5 Total gains and losses $ 1,097 $ 4,413 $ 2,364

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Schedule of minimum amounts required for capital adequacy purposes	Regulatory capital ratios at December 31, 2019 and 2018 , along with the minimum amounts required for capital adequacy purposes and to be well-capitalized under prompt corrective action provisions in effect at such times are presented below for United and the Bank (dollars in thousands) : Basel III Guidelines United Community Banks, Inc. (consolidated) United Community Bank Minimum (1) Well Capitalized 2019 2018 2019 2018 Risk-based ratios: Common equity tier 1 capital 4.5 % 6.5 % 12.97 % 12.16 % 14.87 % 12.91 % Tier 1 capital 6.0 8.0 13.21 12.42 14.87 12.91 Total capital 8.0 10.0 15.01 14.29 15.54 13.60 Tier 1 leverage ratio 4.0 5.0 10.34 9.61 11.63 9.98 Common equity tier 1 capital $ 1,275,148 $ 1,148,355 $ 1,458,720 $ 1,216,449 Tier 1 capital 1,299,398 1,172,605 1,458,720 1,216,449 Total capital 1,476,302 1,348,843 1,524,267 1,281,062 Risk-weighted assets 9,834,051 9,441,622 9,810,477 9,421,009 Average total assets 12,568,563 12,207,986 12,545,254 12,183,341 (1) As of December 31, 2019 and 2018 the additional capital conservation buffer in effect was 2.50% and 1.87%

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of the contract amount of off-balance sheet instruments	The following table summarizes, as of the dates indicated, the contract amount of off-balance sheet instruments (in thousands) : December 31, 2019 2018 Financial instruments whose contract amounts represent credit risk: Commitments to extend credit $ 2,126,275 $ 2,129,463 Letters of credit 22,533 25,447

Equity Compensation and Relat_2

Equity Compensation and Related Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Schedule of restricted stock units and options outstanding and activity	Restricted stock units and options outstanding and activity for the years ended December 31 consisted of the following: Restricted Stock Units Options Shares Weighted Average Grant Date Fair Value Aggregate Intrinsic Value (000’s) Shares Weighted Average Exercise Price Weighted Average Remaining Term (Yrs.) Aggregate Intrinsic Value (000’s) December 31, 2016 690,970 $ 18.60 72,665 $ 34.34 Granted 270,339 26.50 — — Vested (284,662 ) 17.48 — — Expired — — (1,538 ) 147.60 Cancelled (12,830 ) 19.91 (10,840 ) 75.08 December 31, 2017 663,817 22.40 60,287 24.12 Granted 416,484 30.54 — — Vested / Exercised (290,013 ) 20.18 (12,000 ) 11.85 Cancelled (30,542 ) 23.65 (1,148 ) 31.50 December 31, 2018 759,746 27.66 47,139 27.07 Granted 315,827 26.74 — — Vested / Exercised (216,138 ) 25.38 $ 6,004 (13,000 ) 16.34 Expired — (30,243 ) 31.43 Cancelled (51,011 ) 27.18 (2,396 ) 29.68 December 31, 2019 808,424 27.94 24,964 1,500 27.95 0.27 $ 4 Vested / Exercisable at December 31, 2019 — — 1,500 27.95 0.27 4
Schedule of summary of stock options outstanding	The following is a summary of stock options outstanding at December 31, 2019 : Options Outstanding Options Exercisable Shares Range Weighted Average Price Average Remaining Life Shares Weighted Average Price 500 20.00 - 25.00 $ 22.95 0.22 500 $ 22.95 1,000 30.01 - 30.45 30.45 0.29 1,000 30.45 1,500 20.00 - 30.45 27.95 0.27 1,500 27.95

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value on a recurring basis	The table below presents United’s assets and liabilities measured at fair value on a recurring basis, aggregated by the level in the fair value hierarchy within which those measurements fall (in thousands) : December 31, 2019 Level 1 Level 2 Level 3 Total Assets: Debt securities available for sale: U.S. Treasuries $ 154,618 $ — $ — $ 154,618 U.S. Government agencies — 3,035 — 3,035 State and political subdivisions — 226,490 — 226,490 Residential mortgage-backed securities — 1,299,025 — 1,299,025 Commercial mortgage-backed securities — 284,953 — 284,953 Corporate bonds — 202,093 998 203,091 Asset-backed securities — 103,369 — 103,369 Equity securities with readily determinable fair values 1,973 — — 1,973 Mortgage loans held for sale — 58,484 — 58,484 Deferred compensation plan assets 8,133 — — 8,133 Servicing rights for SBA/USDA loans — — 6,794 6,794 Residential mortgage servicing rights — — 13,565 13,565 Derivative financial instruments — 27,769 7,238 35,007 Total assets $ 164,724 $ 2,205,218 $ 28,595 $ 2,398,537 Liabilities: Deferred compensation plan liability $ 8,132 $ — $ — $ 8,132 Derivative financial instruments — 6,957 8,559 15,516 Total liabilities $ 8,132 $ 6,957 $ 8,559 $ 23,648 December 31, 2018 Level 1 Level 2 Level 3 Total Assets: Securities available for sale: U.S. Treasuries $ 149,307 $ — $ — $ 149,307 U.S. Government agencies — 25,553 — 25,553 State and political subdivisions — 233,941 — 233,941 Residential mortgage-backed securities — 1,445,910 — 1,445,910 Commercial mortgage-backed securities — 391,917 — 391,917 Corporate bonds — 198,168 995 199,163 Asset-backed securities — 182,676 — 182,676 Equity securities with readily determinable fair values 1,076 — — 1,076 Mortgage loans held for sale — 18,935 — 18,935 Deferred compensation plan assets 6,404 — — 6,404 Servicing rights for SBA/USDA loans — — 7,510 7,510 Residential mortgage servicing rights — — 11,877 11,877 Derivative financial instruments — 12,864 11,841 24,705 Total assets $ 156,787 $ 2,509,964 $ 32,223 $ 2,698,974 Liabilities: Deferred compensation plan liability $ 6,404 $ — $ — $ 6,404 Derivative financial instruments — 10,701 15,732 26,433 Total liabilities $ 6,404 $ 10,701 $ 15,732 $ 32,837
Schedule of assets measured at fair value on a recurring basis using significant unobservable inputs	The following table shows a reconciliation of the beginning and ending balances for all other assets measured at fair value on a recurring basis using significant unobservable inputs that are classified as Level 3 values (in thousands) : Derivative Asset Derivative Liability Debt Securities Available- for-Sale December 31, 2016 $ 11,777 $ 16,347 $ 675 Sales and settlements (1,744 ) (2,423 ) — Other comprehensive income — — 225 Amounts included in earnings - fair value adjustments 2,174 2,820 — December 31, 2017 12,207 16,744 900 Sales and settlements (1,029 ) (1,347 ) — Other comprehensive income — — 95 Amounts included in earnings - fair value adjustments 663 335 — December 31, 2018 11,841 15,732 995 Sales and settlements (1,135 ) (2,330 ) — Other comprehensive income — — 3 Amounts included in earnings - fair value adjustments (3,468 ) (4,843 ) — December 31, 2019 $ 7,238 $ 8,559 $ 998
Schedule of liabilities measured at fair value on a recurring basis using significant unobservable inputs	The following table shows a reconciliation of the beginning and ending balances for all other assets measured at fair value on a recurring basis using significant unobservable inputs that are classified as Level 3 values (in thousands) : Derivative Asset Derivative Liability Debt Securities Available- for-Sale December 31, 2016 $ 11,777 $ 16,347 $ 675 Sales and settlements (1,744 ) (2,423 ) — Other comprehensive income — — 225 Amounts included in earnings - fair value adjustments 2,174 2,820 — December 31, 2017 12,207 16,744 900 Sales and settlements (1,029 ) (1,347 ) — Other comprehensive income — — 95 Amounts included in earnings - fair value adjustments 663 335 — December 31, 2018 11,841 15,732 995 Sales and settlements (1,135 ) (2,330 ) — Other comprehensive income — — 3 Amounts included in earnings - fair value adjustments (3,468 ) (4,843 ) — December 31, 2019 $ 7,238 $ 8,559 $ 998
Schedule of quantitative information about Level 3 fair value measurements for fair value on a recurring basis	The following table presents quantitative information about recurring Level 3 fair value measurements, excluding servicing rights which are detailed in Note 10 (in thousands) : Fair Value Weighted Average December 31, Valuation Technique December 31, Level 3 Assets 2019 2018 Unobservable Inputs 2019 2018 Corporate bonds 998 995 Indicative bid provided by a broker Multiple factors, including but not limited to, current operations, financial condition, cash flows, and recently executed financing transactions related to the company N/A N/A Derivative assets - mortgage 1,970 1,190 Internal model Pull through rate 83.6 % 80.7 % Derivative assets - other 5,268 10,651 Dealer priced Dealer priced N/A N/A Derivative liabilities - risk participations 12 8 Internal model Probable exposure rate 0.36 % 0.44 % Probability of default rate 1.80 % 1.80 % Derivative liabilities - other 8,547 15,724 Dealer priced Dealer priced N/A N/A
Schedule of presentation of United's assets measured at fair value on nonrecurring basis	The following table presents the fair value hierarchy and carrying value of all assets that were still held as of December 31, 2019 and 2018 , for which a nonrecurring fair value adjustment was recorded during the periods presented (in thousands) . December 31, 2019 Level 1 Level 2 Level 3 Total Loans $ — $ — $ 20,977 $ 20,977 December 31, 2018 Loans $ — $ — $ 8,631 $ 8,631
Schedule of summary of carrying amount and fair values for other financial instruments not measured at fair value on a recurring basis	The carrying amount and fair values for other financial instruments that are not measured at fair value on a recurring basis in United’s consolidated balance sheets are as follows (in thousands) : Carrying Amount Fair Value Level December 31, 2019 Level 1 Level 2 Level 3 Total Assets: Securities held to maturity $ 283,533 $ — $ 287,904 $ — $ 287,904 Loans, net 8,750,464 — — 8,714,592 8,714,592 Liabilities: Deposits 10,897,244 — 10,897,465 — 10,897,465 Long-term debt 212,664 — — 217,665 217,665 December 31, 2018 Assets: Securities held to maturity $ 274,407 $ — $ 268,803 $ — $ 268,803 Loans, net 8,322,198 — — 8,277,387 8,277,387 Liabilities: Deposits 10,534,513 — 10,528,834 — 10,528,834 Federal Home Loan Bank advances 160,000 — 159,988 — 159,988 Long-term debt 267,189 — — 278,996 278,996

Condensed Financial Statement_2

Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) (Tables)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
Schedule of statement of operations	Statements of Income For the Years Ended December 31, 2019 , 2018 and 2017 (in thousands) 2019 2018 2017 Dividends from bank $ — $ 161,500 $ 103,200 Dividends from other subsidiaries 4,651 850 — Shared service fees from subsidiaries 14,721 10,257 10,481 Other 1,468 133 1,078 Total income 20,840 172,740 114,759 Interest expense 11,573 11,868 10,258 Other expense 18,965 14,456 14,960 Total expenses 30,538 26,324 25,218 Income tax benefit 8,711 1,640 1,447 Income before equity in undistributed (loss) earnings of subsidiaries (987 ) 148,056 90,988 Equity in undistributed earnings (loss) of subsidiaries 186,708 18,055 (23,167 ) Net income $ 185,721 $ 166,111 $ 67,821
Schedule of balance sheet	Balance Sheets As of December 31, 2019 and 2018 (in thousands) 2019 2018 Assets Cash $ 32,495 $ 145,669 Investment in bank 1,814,414 1,522,402 Investment in other subsidiaries 752 4,549 Other assets 29,308 21,881 Total assets $ 1,876,969 $ 1,694,501 Liabilities and Shareholders’ Equity Long-term debt $ 212,664 $ 212,193 Other liabilities 28,613 24,754 Total liabilities 241,277 236,947 Shareholders’ equity 1,635,692 1,457,554 Total liabilities and shareholders’ equity $ 1,876,969 $ 1,694,501
Schedule of statement of cash flows	Statements of Cash Flows For the Years Ended December 31, 2019 , 2018 and 2017 (in thousands) 2019 2018 2017 Operating activities: Net income $ 185,721 $ 166,111 $ 67,821 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed (earnings) loss of the subsidiaries (186,708 ) (18,055 ) 23,167 Stock-based compensation 9,360 6,057 5,827 Change in assets and liabilities: Other assets (3,022 ) 1,777 1,220 Other liabilities 2,080 3,124 (758 ) Net cash provided by operating activities 7,431 159,014 97,277 Investing activities: Payment for acquisition (52,093 ) (84,499 ) (11,034 ) Purchases of premises and equipment — (364 ) (708 ) Purchases of debt securities available-for-sale and equity securities (3,000 ) (2,489 ) — Proceeds from sales and maturities of debt securities available-for-sale and equity securities 83 — — Net cash used in investing activities (55,010 ) (87,352 ) (11,742 ) Financing activities: Repayment of long-term debt (250 ) (7,424 ) (75,000 ) Proceeds from issuance of long-term debt, net of issuance costs — 98,188 — Cash related to shares withheld to cover payroll taxes upon vesting of restricted stock units (1,686 ) (1,998 ) (1,701 ) Proceeds from issuance of common stock for dividend reinvestment and employee benefit plans 2,193 679 450 Proceeds from exercise of stock options 212 142 — Repurchase of common stock (13,020 ) — — Cash dividends on common stock (53,044 ) (41,634 ) (26,210 ) Net cash (used in) provided by financing activities (65,595 ) 47,953 (102,461 ) Net change in cash (113,174 ) 119,615 (16,926 ) Cash at beginning of year 145,669 26,054 42,980 Cash at end of year $ 32,495 $ 145,669 $ 26,054

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2019USD ($)segment	Dec. 31, 2017USD ($)	Dec. 31, 2018USD ($)
Accounting Policies [Line Items]
Number of operating segments | segment	1
Number of reportable segments | segment	1
Restricted cash balance	$ 0		$ 6,700,000
Investment in Federal Home Loan Bank stock	11,500,000
Minimum nonaccrual loan relationships for reserve evaluation	$ 500,000
Cumulative effect adjustment to retained earnings, net of income tax effect		$ 437,000
Buildings and improvements | Minimum
Accounting Policies [Line Items]
Estimated useful life (in years)	10 years
Buildings and improvements | Maximum
Accounting Policies [Line Items]
Estimated useful life (in years)	40 years
Land improvements
Accounting Policies [Line Items]
Estimated useful life (in years)	10 years
Furniture and equipment | Minimum
Accounting Policies [Line Items]
Estimated useful life (in years)	3 years
Furniture and equipment | Maximum
Accounting Policies [Line Items]
Estimated useful life (in years)	10 years
Loan Portfolio | Credit Concentration Risk
Accounting Policies [Line Items]
Concentration risk, percentage	76.00%
NER 16-1 VIE
Accounting Policies [Line Items]
Total assets of VIE included in consolidated financial statements			65,500,000
Total liabilities of VIE included in consolidated financial statements			$ 55,300,000

Accounting Standards Updates _2

Accounting Standards Updates and Recently Adopted Standards - Narrative (Details) $ in Thousands	Jan. 01, 2020USD ($)portfolio	Dec. 31, 2019USD ($)	Jan. 01, 2019USD ($)	Jan. 01, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		$ 19,900
Lease liability		$ 22,039
Effect on retained earnings in period of adoption			$ (549)	$ 437
ASU No. 2016-13 | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit losses	$ 8,750
Increase reclassified from fair value mark for PCD financial assets previously classified as PCI	$ 3,590
Number of portfolios in allowance calculation | portfolio	14
Effect on retained earnings in period of adoption	$ 3,530
ASU No. 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset			23,800
Lease liability			26,800
Effect on retained earnings in period of adoption			$ 549
Loans | ASU No. 2016-13 | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit losses	6,880
Unfunded commitments | ASU No. 2016-13 | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit losses	$ 1,870

Mergers and Acquisitions - Narr

Mergers and Acquisitions - Narrative (Details)	May 01, 2019USD ($)bank_branch	Feb. 01, 2018USD ($)	Nov. 01, 2017USD ($)bank_branch$ / sharesshares	Jul. 31, 2017USD ($)bank_branchshares	Jan. 31, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Goodwill								$ 307,112,000	$ 327,425,000	$ 307,112,000	$ 220,591,000
Goodwill adjustment										(858,000)
Merger-related and other charges									6,907,000	5,414,000	13,901,000
FMBT
Business Acquisition [Line Items]
Number of banking offices | bank_branch	4
Assets acquired	$ 244,624,000
Liabilities assumed	212,844,000
Cash payments for acquisition	52,093,000
Goodwill	20,313,000
Goodwill expected to be tax deductible	0
Intangible assets acquired	2,800,000
Premises and equipment, net	8,524,000
FMBT | Merger-related costs
Business Acquisition [Line Items]
Merger-related and other charges									$ 2,020,000
FMBT | Core deposit intangible
Business Acquisition [Line Items]
Intangible assets acquired	$ 2,800,000
Expected useful life of intangible assets (in years)	9 years 3 months
Navitas
Business Acquisition [Line Items]
Assets acquired		$ 393,300,000
Liabilities assumed		350,433,000
Consideration transferred		130,246,000
Cash payments for acquisition		84,500,000
Common stock issued as consideration		45,746,000
Goodwill		87,379,000
Goodwill expected to be tax deductible		0
Provisional value adjustment decrease to acquired loans								526,000
Goodwill adjustment								$ 390,000
Value of loans acquired separate from the business combination					$ 19,900,000
Premises and equipment, net		$ 324,000
Navitas | Merger-related costs
Business Acquisition [Line Items]
Merger-related and other charges										$ 4,980,000
FOFN
Business Acquisition [Line Items]
Number of banking offices | bank_branch			14
Assets acquired			$ 730,491,000
Liabilities assumed			657,566,000
Consideration transferred			126,467,000
Cash payments for acquisition			12,802,000
Common stock issued as consideration			113,665,000
Goodwill			53,542,000
Goodwill expected to be tax deductible			0
Intangible assets acquired			$ 8,738,000
Goodwill adjustment							$ (1,160,000)
Number of shares received for each share outstanding (in shares) | shares			0.6178
Cash per common share outstanding (in dollars per share) | $ / shares			$ 1.90
Loans held for sale			$ 10,686,000				10,700,000
Servicing assets							65,000
Provisional value adjustment increase to loans held for sale							2,590,000
Provisional value adjustment decrease to servicing assets							354,000
Premises and equipment, net			12,398,000
Provisional value adjustment for deferred tax asset							$ (1,080,000)
FOFN | Subordinated debentures
Business Acquisition [Line Items]
Liabilities assumed			11,500,000
FOFN | Trust preferred securities
Business Acquisition [Line Items]
Liabilities assumed			12,400,000
FOFN | Core deposit intangible
Business Acquisition [Line Items]
Intangible assets acquired			$ 7,830,000
Expected useful life of intangible assets (in years)			11 years 6 months
FOFN | Noncompete agreement
Business Acquisition [Line Items]
Intangible assets acquired			$ 908,000
Expected useful life of intangible assets (in years)			1 year
HCSB
Business Acquisition [Line Items]
Number of banking offices | bank_branch				8
Assets acquired				$ 389,436,000
Liabilities assumed				346,646,000
Consideration transferred				65,831,000
Cash payments for acquisition				31,000
Common stock issued as consideration				65,800,000
Goodwill				24,166,000
Goodwill expected to be tax deductible				0
Intangible assets acquired				$ 5,716,000
Goodwill adjustment						$ 303,000
Number of shares received for each share outstanding (in shares) | shares				0.0050
Premises and equipment, net				$ 7,424,000		7,420,000
Provisional value adjustment decrease to premises and equipment						493,000
Provisional value adjustment for deferred tax asset						$ 190,000
HCSB | Core deposit intangible
Business Acquisition [Line Items]
Intangible assets acquired				$ 3,480,000
Expected useful life of intangible assets (in years)				6 years
HCSB | Noncompete agreement
Business Acquisition [Line Items]
Intangible assets acquired				$ 2,240,000
HCSB | Noncompete agreement | Minimum
Business Acquisition [Line Items]
Expected useful life of intangible assets (in years)				1 year
HCSB | Noncompete agreement | Maximum
Business Acquisition [Line Items]
Expected useful life of intangible assets (in years)				2 years
FOFN and HCSB | Merger-related costs
Business Acquisition [Line Items]
Merger-related and other charges											$ 8,710,000

Mergers and Acquisitions - Acqu

Mergers and Acquisitions - Acquisition date fair value of purchased assets and liabilities (Details) - USD ($) $ in Thousands	May 01, 2019	Feb. 01, 2018	Nov. 01, 2017	Jul. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Assets
Accrued interest receivable					$ 32,660	$ 35,413
Net deferred tax asset					203
Liabilities
Total identifiable net assets					52,100	130,000			$ 115,000
Consideration transferred
Goodwill					$ 327,425	$ 307,112			$ 220,591
FMBT
Assets
Cash and cash equivalents	$ 32,548
Loans, net	192,494
Allowance for loan losses	0
Premises and equipment, net	8,524
Bank owned life insurance	6,823
Net deferred tax asset	157
Intangibles	2,800
Other assets	1,278
Total assets acquired	244,624
Liabilities
Deposits	212,127
Other liabilities	717
Total liabilities assumed	212,844
Total identifiable net assets	31,780
Consideration transferred
Cash	52,093
Goodwill	20,313
FMBT | Fair Value Adjustments
Assets
Cash and cash equivalents	0
Loans, net	(5,188)
Allowance for loan losses	6,338
Premises and equipment, net	1,400
Bank owned life insurance	0
Net deferred tax asset	(1,229)
Intangibles	2,800
Other assets	246
Total assets acquired	4,367
Liabilities
Deposits	243
Other liabilities	(207)
Total liabilities assumed	36
Aggregate fair value adjustments	4,331
FMBT | First Madison Bank & Trust | As Recorded by FMBT
Assets
Cash and cash equivalents	32,548
Loans, net	197,682
Allowance for loan losses	(6,338)
Premises and equipment, net	7,124
Bank owned life insurance	6,823
Net deferred tax asset	1,386
Intangibles	0
Other assets	1,032
Total assets acquired	240,257
Liabilities
Deposits	211,884
Other liabilities	924
Total liabilities assumed	212,808
Excess of assets acquired over liabilities assumed	$ 27,449
Navitas
Assets
Cash and cash equivalents		$ 27,700
Loans, net		358,352
Premises and equipment, net		324
Net deferred tax asset		2,873
Other assets		4,051
Total assets acquired		393,300
Liabilities
Short-term borrowings		214,923
Long-term debt		119,402
Other liabilities		16,108
Total liabilities assumed		350,433
Total identifiable net assets		42,867
Consideration transferred
Cash		84,500
Common stock issued		$ 45,746
Common stock issued (in shares)		1,443,987
Total fair value of consideration transferred		$ 130,246
Goodwill		87,379
Navitas | Fair Value Adjustments
Assets
Cash and cash equivalents		0
Loans, net		(7,181)
Premises and equipment, net		(304)
Net deferred tax asset		2,873
Other assets		(1,066)
Total assets acquired		(5,678)
Liabilities
Short-term borrowings		0
Long-term debt		0
Other liabilities		(951)
Total liabilities assumed		(951)
Aggregate fair value adjustments		(4,727)
Navitas | NLFC Holdings Corp | As Recorded by Navitas
Assets
Cash and cash equivalents		27,700
Loans, net		365,533
Premises and equipment, net		628
Net deferred tax asset		0
Other assets		5,117
Total assets acquired		398,978
Liabilities
Short-term borrowings		214,923
Long-term debt		119,402
Other liabilities		17,059
Total liabilities assumed		351,384
Excess of assets acquired over liabilities assumed		$ 47,594
FOFN
Assets
Cash and cash equivalents			$ 48,658
Securities			114,972
Loans held for sale			10,686					$ 10,700
Loans, net			486,244
Premises and equipment, net			12,398
Bank owned life insurance			20,339
Accrued interest receivable			1,740
Net deferred tax asset			17,334
Intangibles			8,738
Other real estate owned			659
Other assets			8,723
Total assets acquired			730,491
Liabilities
Deposits			565,205
Federal Home Loan Bank advances			65,224
Long-term debt			19,747
Other liabilities			7,390
Total liabilities assumed			657,566
Total identifiable net assets			72,925
Consideration transferred
Cash			12,802
Common stock issued			$ 113,665
Common stock issued (in shares)			4,145,343
Total fair value of consideration transferred			$ 126,467
Goodwill			53,542
FOFN | Fair Value Adjustments
Assets
Cash and cash equivalents			6
Securities			782
Loans held for sale			(3,290)
Loans, net			(5,477)
Premises and equipment, net			1,147
Bank owned life insurance			0
Accrued interest receivable			(118)
Net deferred tax asset			(999)
Intangibles			8,738
Other real estate owned			(514)
Other assets			(69)
Total assets acquired			206
Liabilities
Deposits			1,365
Federal Home Loan Bank advances			224
Long-term debt			(4,125)
Other liabilities			60
Total liabilities assumed			(2,476)
Aggregate fair value adjustments			2,682
FOFN | Four Oaks Bank | As Recorded by FOFN
Assets
Cash and cash equivalents			48,652
Securities			114,190
Loans held for sale			13,976
Loans, net			491,721
Premises and equipment, net			11,251
Bank owned life insurance			20,339
Accrued interest receivable			1,858
Net deferred tax asset			18,333
Intangibles			0
Other real estate owned			1,173
Other assets			8,792
Total assets acquired			730,285
Liabilities
Deposits			563,840
Federal Home Loan Bank advances			65,000
Long-term debt			23,872
Other liabilities			7,330
Total liabilities assumed			660,042
Excess of assets acquired over liabilities assumed			$ 70,243
HCSB
Assets
Cash and cash equivalents				$ 17,853
Securities				101,320
Loans, net				215,947
Premises and equipment, net				7,424			$ 7,420
Bank owned life insurance				11,827
Accrued interest receivable				1,047
Net deferred tax asset				25,579
Intangibles				5,716
Other real estate owned				805
Other assets				1,918
Total assets acquired				389,436
Liabilities
Deposits				318,942
Repurchase agreements				1,141
Federal Home Loan Bank advances				24,517
Other liabilities				2,046
Total liabilities assumed				346,646
Total identifiable net assets				42,790
Consideration transferred
Cash				31
Common stock issued				$ 65,800
Common stock issued (in shares)				2,370,331
Total fair value of consideration transferred				$ 65,831
Equity interest held before the business combination				1,125
Goodwill				24,166
HCSB | Fair Value Adjustments
Assets
Cash and cash equivalents				(2)
Securities				(142)
Loans, net				(12,536)
Premises and equipment, net				(6,606)
Bank owned life insurance				0
Accrued interest receivable				(275)
Net deferred tax asset				25,579
Intangibles				5,716
Other real estate owned				(372)
Other assets				(32)
Total assets acquired				11,330
Liabilities
Deposits				430
Repurchase agreements				0
Federal Home Loan Bank advances				517
Other liabilities				91
Total liabilities assumed				1,038
Aggregate fair value adjustments				10,292
HCSB | Horry County State Bank | As Recorded by HCSB
Assets
Cash and cash equivalents				17,855
Securities				101,462
Loans, net				228,483
Premises and equipment, net				14,030
Bank owned life insurance				11,827
Accrued interest receivable				1,322
Net deferred tax asset				0
Intangibles				0
Other real estate owned				1,177
Other assets				1,950
Total assets acquired				378,106
Liabilities
Deposits				318,512
Repurchase agreements				1,141
Federal Home Loan Bank advances				24,000
Other liabilities				1,955
Total liabilities assumed				345,608
Excess of assets acquired over liabilities assumed				$ 32,498

Mergers and Acquisitions - Ac_2

Mergers and Acquisitions - Acquired loan and lease asset portfolio at acquisition date (Details) - USD ($) $ in Thousands	May 01, 2019	Feb. 01, 2018	Nov. 01, 2017	Jul. 31, 2017
FMBT
Accounted for pursuant to ASC 310-30
Contractually required principal and interest	$ 13,145
Non-accretable difference	2,517
Cash flows expected to be collected	10,628
Accretable yield	1,300
Fair value	9,328
Excluded from ASC 310-30
Fair value	183,166
Gross contractual amounts receivable	218,855
Estimate of contractual cash flows not expected to be collected	$ 8,826
Navitas
Accounted for pursuant to ASC 310-30
Contractually required principal and interest		$ 24,711
Non-accretable difference		5,505
Cash flows expected to be collected		19,206
Accretable yield		1,977
Fair value		17,229
Excluded from ASC 310-30
Fair value		341,123
Gross contractual amounts receivable		389,432
Estimate of contractual cash flows not expected to be collected		$ 8,624
FOFN
Accounted for pursuant to ASC 310-30
Contractually required principal and interest			$ 49,377
Non-accretable difference			8,244
Cash flows expected to be collected			41,133
Accretable yield			3,313
Fair value			37,820
Excluded from ASC 310-30
Fair value			448,462
Gross contractual amounts receivable			509,629
Estimate of contractual cash flows not expected to be collected			$ 6,081
HCSB
Accounted for pursuant to ASC 310-30
Contractually required principal and interest				$ 46,069
Non-accretable difference				12,413
Cash flows expected to be collected				33,656
Accretable yield				3,410
Fair value				30,246
Excluded from ASC 310-30
Fair value				185,701
Gross contractual amounts receivable				212,780
Estimate of contractual cash flows not expected to be collected				$ 3,985

Mergers and Acquisitions - Pro

Mergers and Acquisitions - Pro forma information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Supplemental consolidated pro forma Revenue	$ 563,872	$ 539,152	$ 495,052
Supplemental consolidated pro forma Net Income	187,124	171,218	78,958
FMBT
Business Acquisition [Line Items]
Actual Revenue	7,525
Actual Net income	$ 4,053
Navitas
Business Acquisition [Line Items]
Actual Revenue		24,285
Actual Net income		$ 7,149
FOFN
Business Acquisition [Line Items]
Actual Revenue			5,265
Actual Net income			1,406
HCSB
Business Acquisition [Line Items]
Actual Revenue			5,775
Actual Net income			$ 1,385

Cash Flows - Narrative (Details

Cash Flows - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flow [Line Items]
Transferred to foreclosed property	$ 1,170	$ 3,020	$ 4,150
Unsettled sales of government guaranteed loans	8,190	32,900	27,500
Assets acquired, fair value	265,000	481,000	1,120,000
Liabilities assumed, fair value	213,000	350,000	1,000,000
Net assets acquired	$ 52,100	130,000	115,000
Common Stock
Cash Flow [Line Items]
Common stock issued as consideration		$ 45,700	$ 179,000

Balance Sheet Offsetting and _3

Balance Sheet Offsetting and Repurchase Agreements Accounted for as Secured Borrowings - Summary of amounts outstanding under master netting agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting [Abstract]
Repurchase agreements / reverse repurchase agreements, gross amounts of recognized assets		$ 50,000
Repurchase agreements / reverse repurchase agreements, gross amounts offset on balance sheet		(50,000)
Repurchase agreements / reverse repurchase agreements, net asset balance		0
Repurchase agreements / reverse repurchase agreements, gross amounts not offset in balance sheet - financial instruments		0
Repurchase agreements/ reverse repurchase agreements, gross amounts not offset in balance sheet - collateral received		0
Repurchase agreements / reverse repurchase agreements, net amount		0
Derivative, gross amounts of recognized assets	$ 35,007	24,705
Derivative, gross amounts offset on balance sheet	0	0
Derivatives, net asset balance	35,007	24,705
Derivatives, gross amounts not offset in balance sheet - financial instruments	(401)	(973)
Derivatives, gross amounts not offset in balance sheet - collateral received	0	(8,029)
Derivatives asset, net amount	34,606	15,703
Offsetting assets, gross amounts of recognized assets	35,007	74,705
Offsetting assets, gross amounts offset on balance sheet	0	(50,000)
Offsetting assets, net asset balance	35,007	24,705
Offsetting assets, gross amounts not offset in balance sheet - financial instruments	(401)	(973)
Offsetting assets, gross amounts not offset in the balance sheet - collateral received	0	(8,029)
Offsetting assets, net amount	34,606	$ 15,703
Weighted average interest rate of reverse repurchase agreements, assets (percent)		3.20%
Repurchase agreements / reverse repurchase agreements, gross amounts of recognized liabilities		$ 50,000
Repurchase agreements / reverse repurchase agreements, gross amounts offset on balance sheet		(50,000)
Repurchase agreements / reverse repurchase agreements, net liability balance		0
Repurchase agreements / reverse repurchase agreements, gross amounts not offset in balance sheet - financial instruments		0
Repurchase agreements / reverse repurchase agreements, gross amounts not offset in balance sheet - collateral pledged		0
Repurchase agreements / reverse repurchase agreements, net amount		0
Derivatives, gross amounts of recognized liabilities	15,516	26,433
Derivatives, gross amounts offset on balance sheet	0	0
Derivatives, net liability balance	15,516	26,433
Derivatives, gross amounts not offset in balance sheet - financial instruments	(401)	(973)
Derivatives, gross amounts not offset in balance sheet - collateral pledged	(14,933)	(16,126)
Derivatives, net amount	182	9,334
Offsetting liabilities, gross amounts of recognized liabilities	15,516	76,433
Offsetting liabilities, gross amounts offset on balance sheet	0	(50,000)
Offsetting liabilities, net liability balance	15,516	26,433
Offsetting liabilities gross, amounts not offset in balance sheet - financial instruments	(401)	(973)
Offsetting liabilities gross amounts not offset in the balance sheet - collateral pledged	(14,933)	(16,126)
Offsetting liabilities, net amount	$ 182	$ 9,334
Weighted average interest rate of reverse repurchase agreements, liabilities (percent)		2.45%

Balance Sheet Offsetting and _4

Balance Sheet Offsetting and Repurchase Agreements Accounted for as Secured Borrowings - Narrative (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Offsetting [Abstract]
Right to reclaim cash collateral	$ 14,900,000	$ 16,100,000
Obligation to return cash collateral	$ 0	$ 8,030,000

Balance Sheet Offsetting and _5

Balance Sheet Offsetting and Repurchase Agreements Accounted for as Secured Borrowings - Repurchase agreements accounted for as secured borrowings (Details) $ in Thousands	Dec. 31, 2018USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	$ 50,000
Gross amount of recognized liabilities for repurchase agreements in offsetting disclosure	50,000
Amounts related to agreements not included in offsetting disclosure	0
Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	0
Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	0
30 to 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	50,000
91 to 110 days
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	0
Mortgage-backed securities
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	50,000
Mortgage-backed securities | Overnight and Continuous
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	0
Mortgage-backed securities | Up to 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	0
Mortgage-backed securities | 30 to 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	50,000
Mortgage-backed securities | 91 to 110 days
Assets Sold under Agreements to Repurchase [Line Items]
Remaining Contractual Maturity of the Agreements	$ 0

Investment Securities - Narrati

Investment Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2019USD ($)security	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Investments, Debt and Equity Securities [Abstract]
Carrying value of securities pledged to secure public deposits, derivatives and other secured borrowings | $	$ 918,000,000	$ 925,000,000
Number of available for sale securities in unrealized loss position | security	51
Number of held-to-maturity securities in unrealized loss position | security	33
Other-than-temporary impairment charges | $	$ 0	$ 0	$ 0

Investment Securities - Cost ba

Investment Securities - Cost basis, unrealized gains and losses, and fair value of debt securities held to maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Held-to-maturity securities:
Amortized Cost	$ 283,533	$ 274,407
Gross Unrealized Gains	5,215	1,777
Gross Unrealized Losses	844	7,381
Fair value	287,904	268,803
State and political subdivisions
Held-to-maturity securities:
Amortized Cost	45,479	68,551
Gross Unrealized Gains	1,574	952
Gross Unrealized Losses	9	2,191
Fair value	47,044	67,312
Residential mortgage-backed securities, Agency
Held-to-maturity securities:
Amortized Cost	153,967	176,488
Gross Unrealized Gains	2,014	652
Gross Unrealized Losses	694	5,094
Fair value	155,287	172,046
Commercial mortgage-backed, Agency
Held-to-maturity securities:
Amortized Cost	84,087	29,368
Gross Unrealized Gains	1,627	173
Gross Unrealized Losses	141	96
Fair value	$ 85,573	$ 29,445

Investment Securities - Cost _2

Investment Securities - Cost basis, unrealized gains and losses, and fair value of debt securities available for sale (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt securities available-for-sale and equity securities:
Amortized Cost	$ 2,240,607	$ 2,660,263
Gross Unrealized Gains	36,982	6,454
Gross Unrealized Losses	3,008	38,250
Fair Value	2,274,581	2,628,467
U.S. Treasuries
Debt securities available-for-sale and equity securities:
Amortized Cost	152,990	150,712
Gross Unrealized Gains	1,628	767
Gross Unrealized Losses	0	2,172
Fair Value	154,618	149,307
U.S. Government agencies
Debt securities available-for-sale and equity securities:
Amortized Cost	2,848	25,493
Gross Unrealized Gains	188	335
Gross Unrealized Losses	1	275
Fair Value	3,035	25,553
State and political subdivisions
Debt securities available-for-sale and equity securities:
Amortized Cost	214,677	234,750
Gross Unrealized Gains	11,813	907
Gross Unrealized Losses	0	1,716
Fair Value	226,490	233,941
Residential mortgage-backed securities, Agency
Debt securities available-for-sale and equity securities:
Amortized Cost	1,030,948	1,125,194
Gross Unrealized Gains	12,022	2,448
Gross Unrealized Losses	726	20,124
Fair Value	1,042,244	1,107,518
Residential mortgage-backed securities, Non-agency
Debt securities available-for-sale and equity securities:
Amortized Cost	250,550	339,186
Gross Unrealized Gains	6,231	980
Gross Unrealized Losses	0	1,774
Fair Value	256,781	338,392
Commercial mortgage-backed, Agency
Debt securities available-for-sale and equity securities:
Amortized Cost	266,770	384,222
Gross Unrealized Gains	2,261	1
Gross Unrealized Losses	128	7,339
Fair Value	268,903	376,884
Commercial mortgage-backed, Non-agency
Debt securities available-for-sale and equity securities:
Amortized Cost	15,395	15,441
Gross Unrealized Gains	918	186
Gross Unrealized Losses	263	594
Fair Value	16,050	15,033
Corporate bonds
Debt securities available-for-sale and equity securities:
Amortized Cost	202,131	200,582
Gross Unrealized Gains	1,178	502
Gross Unrealized Losses	218	1,921
Fair Value	203,091	199,163
Asset-backed securities
Debt securities available-for-sale and equity securities:
Amortized Cost	104,298	184,683
Gross Unrealized Gains	743	328
Gross Unrealized Losses	1,672	2,335
Fair Value	$ 103,369	$ 182,676

Investment Securities - Summary

Investment Securities - Summary of held-to-maturity securities in unrealized loss position (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Summary of held to maturity securities in an unrealized loss position
Fair Value, Less than 12 Months	$ 48,007	$ 13,641
Unrealized Loss, Less than 12 Months	160	107
Fair Value, 12 Months or More	49,922	174,812
Unrealized Loss, 12 Months or More	684	7,274
Fair Value, Total	97,929	188,453
Unrealized Loss, Total	844	7,381
State and political subdivisions
Summary of held to maturity securities in an unrealized loss position
Fair Value, Less than 12 Months	10,117	7,062
Unrealized Loss, Less than 12 Months	9	46
Fair Value, 12 Months or More	0	34,146
Unrealized Loss, 12 Months or More	0	2,145
Fair Value, Total	10,117	41,208
Unrealized Loss, Total	9	2,191
Residential mortgage-backed securities, Agency
Summary of held to maturity securities in an unrealized loss position
Fair Value, Less than 12 Months	16,049	6,579
Unrealized Loss, Less than 12 Months	64	61
Fair Value, 12 Months or More	48,237	136,376
Unrealized Loss, 12 Months or More	630	5,033
Fair Value, Total	64,286	142,955
Unrealized Loss, Total	694	5,094
Commercial mortgage-backed, Agency
Summary of held to maturity securities in an unrealized loss position
Fair Value, Less than 12 Months	21,841	0
Unrealized Loss, Less than 12 Months	87	0
Fair Value, 12 Months or More	1,685	4,290
Unrealized Loss, 12 Months or More	54	96
Fair Value, Total	23,526	4,290
Unrealized Loss, Total	$ 141	$ 96

Investment Securities - Summa_2

Investment Securities - Summary of available-for-sale securities in unrealized loss position (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months	$ 281,051	$ 328,787
Unrealized Loss, Less than 12 Months	1,418	3,309
Fair Value, 12 Months or More	96,663	1,555,326
Unrealized Loss, 12 Months or More	1,590	34,941
Fair Value, Total	377,714	1,884,113
Unrealized Loss, Total	3,008	38,250
U.S. Treasuries
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months		0
Unrealized Loss, Less than 12 Months		0
Fair Value, 12 Months or More		120,391
Unrealized Loss, 12 Months or More		2,172
Fair Value, Total		120,391
Unrealized Loss, Total		2,172
US Government agencies
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months	404	0
Unrealized Loss, Less than 12 Months	1	0
Fair Value, 12 Months or More	0	21,519
Unrealized Loss, 12 Months or More	0	275
Fair Value, Total	404	21,519
Unrealized Loss, Total	1	275
State and political subdivisions
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months		15,160
Unrealized Loss, Less than 12 Months		28
Fair Value, 12 Months or More		133,500
Unrealized Loss, 12 Months or More		1,688
Fair Value, Total		148,660
Unrealized Loss, Total		1,716
Residential mortgage-backed securities, Agency
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months	228,611	80,202
Unrealized Loss, Less than 12 Months	576	332
Fair Value, 12 Months or More	18,294	723,094
Unrealized Loss, 12 Months or More	150	19,792
Fair Value, Total	246,905	803,296
Unrealized Loss, Total	726	20,124
Residential mortgage-backed securities, Non-agency
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months		154,381
Unrealized Loss, Less than 12 Months		476
Fair Value, 12 Months or More		52,266
Unrealized Loss, 12 Months or More		1,298
Fair Value, Total		206,647
Unrealized Loss, Total		1,774
Commercial mortgage-backed, Agency
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months	0	0
Unrealized Loss, Less than 12 Months	0	0
Fair Value, 12 Months or More	33,517	355,292
Unrealized Loss, 12 Months or More	128	7,339
Fair Value, Total	33,517	355,292
Unrealized Loss, Total	128	7,339
Commercial mortgage-backed, Non-agency
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months	0	4,552
Unrealized Loss, Less than 12 Months	0	594
Fair Value, 12 Months or More	4,864	0
Unrealized Loss, 12 Months or More	263	0
Fair Value, Total	4,864	4,552
Unrealized Loss, Total	263	594
Corporate bonds
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months	19,742	0
Unrealized Loss, Less than 12 Months	216	0
Fair Value, 12 Months or More	998	117,296
Unrealized Loss, 12 Months or More	2	1,921
Fair Value, Total	20,740	117,296
Unrealized Loss, Total	218	1,921
Asset-backed securities
Summary of available for sale securities in an unrealized loss position
Fair Value, Less than 12 Months	32,294	74,492
Unrealized Loss, Less than 12 Months	625	1,879
Fair Value, 12 Months or More	38,990	31,968
Unrealized Loss, 12 Months or More	1,047	456
Fair Value, Total	71,284	106,460
Unrealized Loss, Total	$ 1,672	$ 2,335

Investment Securities - Summa_3

Investment Securities - Summary of securities sales activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 352,106	$ 168,891	$ 340,540
Gross gains on sales	1,843	2,082	1,247
Gross losses on sales	(2,864)	(2,738)	(1,205)
Net (losses) gains on sales of securities	(1,021)	(656)	42
Income tax (benefit) expense attributable to sales	$ (247)	$ (132)	$ 14

Investment Securities - Amortiz

Investment Securities - Amortized cost and fair value of held-to-maturity and available-for-sale securities by contractual maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-Sale, Amortized Cost
Amortized Cost	$ 2,240,607	$ 2,660,263
Available-for-Sale, Fair Value
Fair Value	2,274,581	2,628,467
Held-to-Maturity, Amortized Cost
Amortized Cost	283,533	274,407
Held-to-Maturity Fair Value
Fair value	287,904	268,803
U.S. Treasuries
Available-for-Sale, Amortized Cost
Available-for-Sale, Amortized Cost, Within 1 year	29,877
Available-for-Sale, Amortized Cost, 1 to 5 years	123,113
Amortized Cost	152,990	150,712
Available-for-Sale, Fair Value
Available-for-Sale, Fair Value, Within 1 year	29,962
Available-for-Sale, Fair Value, 1 to 5 years	124,656
Fair Value	154,618	149,307
Held-to-Maturity, Amortized Cost
Held-to-Maturity, Amortized Cost, Within 1 year	0
Held-to-Maturity, Amortized Cost, 1 to 5 years	0
Amortized Cost	0
Held-to-Maturity Fair Value
Held-to-Maturity, Fair Value, Within 1 year	0
Held-to-Maturity, Fair Value, 1 to 5 years	0
Fair value	0
US Government agencies
Available-for-Sale, Amortized Cost
Available-for-Sale, Amortized Cost, 1 to 5 years	405
Available-for-Sale, Amortized Cost, More than 10 years	2,443
Amortized Cost	2,848
Available-for-Sale, Fair Value
Available-for-Sale, Fair Value, 1 to 5 years	404
Available-for-Sale, Fair Value, More than 10 years	2,631
Fair Value	3,035
Held-to-Maturity, Amortized Cost
Held-to-Maturity, Amortized Cost, 1 to 5 years	0
Held-to-Maturity, Amortized Cost, More than 10 years	0
Amortized Cost	0
Held-to-Maturity Fair Value
Held-to-Maturity, Fair Value, 1 to 5 years	0
Held-to-Maturity, Fair Value, More than 10 years	0
Fair value	0
State and political subdivisions
Available-for-Sale, Amortized Cost
Available-for-Sale, Amortized Cost, Within 1 year	935
Available-for-Sale, Amortized Cost, 1 to 5 years	54,102
Available-for-Sale, Amortized Cost, 5 to 10 years	22,585
Available-for-Sale, Amortized Cost, More than 10 years	137,055
Amortized Cost	214,677	234,750
Available-for-Sale, Fair Value
Available-for-Sale, Fair Value, Within 1 year	939
Available-for-Sale, Fair Value, 1 to 5 years	55,491
Available-for-Sale, Fair Value, 5 to 10 years	23,766
Available-for-Sale, Fair Value, More than 10 years	146,294
Fair Value	226,490	233,941
Held-to-Maturity, Amortized Cost
Held-to-Maturity, Amortized Cost, Within 1 year	1,350
Held-to-Maturity, Amortized Cost, 1 to 5 years	11,761
Held-to-Maturity, Amortized Cost, 5 to 10 years	6,202
Held-to-Maturity, Amortized Cost, More than 10 years	26,166
Amortized Cost	45,479	68,551
Held-to-Maturity Fair Value
Held-to-Maturity, Fair Value, Within 1 year	1,369
Held-to-Maturity, Fair Value, 1 to 5 years	12,370
Held-to-Maturity, Fair Value, 5 to 10 years	6,866
Held-to-Maturity, Fair Value, More than 10 years	26,439
Fair value	47,044	67,312
Corporate bonds
Available-for-Sale, Amortized Cost
Available-for-Sale, Amortized Cost, Within 1 year	170,007
Available-for-Sale, Amortized Cost, 1 to 5 years	27,624
Available-for-Sale, Amortized Cost, 5 to 10 years	3,500
Available-for-Sale, Amortized Cost, More than 10 years	1,000
Amortized Cost	202,131	200,582
Available-for-Sale, Fair Value
Available-for-Sale, Fair Value, Within 1 year	170,380
Available-for-Sale, Fair Value, 1 to 5 years	28,171
Available-for-Sale, Fair Value, 5 to 10 years	3,542
Available-for-Sale, Fair Value, More than 10 years	998
Fair Value	203,091	199,163
Held-to-Maturity, Amortized Cost
Held-to-Maturity, Amortized Cost, Within 1 year	0
Held-to-Maturity, Amortized Cost, 1 to 5 years	0
Held-to-Maturity, Amortized Cost, 5 to 10 years	0
Held-to-Maturity, Amortized Cost, More than 10 years	0
Amortized Cost	0
Held-to-Maturity Fair Value
Held-to-Maturity, Fair Value, Within 1 year	0
Held-to-Maturity, Fair Value, 1 to 5 years	0
Held-to-Maturity, Fair Value, 5 to 10 years	0
Held-to-Maturity, Fair Value, More than 10 years	0
Fair value	0
Asset-backed securities
Available-for-Sale, Amortized Cost
Available-for-Sale, Amortized Cost, 1 to 5 years	1,585
Available-for-Sale, Amortized Cost, More than 10 years	102,713
Amortized Cost	104,298	184,683
Available-for-Sale, Fair Value
Available-for-Sale, Fair Value, 1 to 5 years	1,578
Available-for-Sale, Fair Value, More than 10 years	101,791
Fair Value	103,369	$ 182,676
Held-to-Maturity, Amortized Cost
Held-to-Maturity, Amortized Cost, 1 to 5 years	0
Held-to-Maturity, Amortized Cost, More than 10 years	0
Amortized Cost	0
Held-to-Maturity Fair Value
Held-to-Maturity, Fair Value, 1 to 5 years	0
Held-to-Maturity, Fair Value, More than 10 years	0
Fair value	0
Total securities other than mortgage-backed securities
Available-for-Sale, Amortized Cost
Available-for-Sale, Amortized Cost, Within 1 year	200,819
Available-for-Sale, Amortized Cost, 1 to 5 years	206,829
Available-for-Sale, Amortized Cost, 5 to 10 years	26,085
Available-for-Sale, Amortized Cost, More than 10 years	243,211
Available-for-Sale, Fair Value
Available-for-Sale, Fair Value, Within 1 year	201,281
Available-for-Sale, Fair Value, 1 to 5 years	210,300
Available-for-Sale, Fair Value, 5 to 10 years	27,308
Available-for-Sale, Fair Value, More than 10 years	251,714
Held-to-Maturity, Amortized Cost
Held-to-Maturity, Amortized Cost, Within 1 year	1,350
Held-to-Maturity, Amortized Cost, 1 to 5 years	11,761
Held-to-Maturity, Amortized Cost, 5 to 10 years	6,202
Held-to-Maturity, Amortized Cost, More than 10 years	26,166
Held-to-Maturity Fair Value
Held-to-Maturity, Fair Value, Within 1 year	1,369
Held-to-Maturity, Fair Value, 1 to 5 years	12,370
Held-to-Maturity, Fair Value, 5 to 10 years	6,866
Held-to-Maturity, Fair Value, More than 10 years	26,439
Residential mortgage-backed securities
Available-for-Sale, Amortized Cost
Amortized Cost	1,281,498
Available-for-Sale, Fair Value
Fair Value	1,299,025
Held-to-Maturity, Amortized Cost
Amortized Cost	153,967
Held-to-Maturity Fair Value
Fair value	155,287
Commercial mortgage-backed securities
Available-for-Sale, Amortized Cost
Amortized Cost	282,165
Available-for-Sale, Fair Value
Fair Value	284,953
Held-to-Maturity, Amortized Cost
Amortized Cost	84,087
Held-to-Maturity Fair Value
Fair value	$ 85,573

Loans and Leases and Allowanc_3

Loans and Leases and Allowance for Credit Losses - Major classifications of loans and lease portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Classifications of loans
Total loans	$ 8,812,553	$ 8,383,401
Less allowance for loan losses	(62,089)	(61,203)
Loans, net	8,750,464	8,322,198
Loans Receivable
Classifications of loans
Total loans	8,812,553	8,383,401
Less allowance for loan losses	(62,089)
Loans Receivable | Indirect auto
Classifications of loans
Total loans	0	207,692
Loans Receivable | Commercial
Classifications of loans
Total loans	6,669,593	6,099,443
Loans Receivable | Commercial | Owner occupied commercial real estate
Classifications of loans
Total loans	1,720,227	1,647,904
Loans Receivable | Commercial | Income producing commercial real estate
Classifications of loans
Total loans	2,007,950	1,812,420
Loans Receivable | Commercial | Commercial & industrial
Classifications of loans
Total loans	1,220,657	1,278,347
Loans Receivable | Commercial | Construction
Classifications of loans
Total loans	976,215	796,158
Loans Receivable | Commercial | Equipment financing
Classifications of loans
Total loans	744,544	564,614
Loans Receivable | Residential | Residential mortgage
Classifications of loans
Total loans	1,117,616	1,049,232
Loans Receivable | Residential | Home equity lines of credit
Classifications of loans
Total loans	660,675	694,010
Loans Receivable | Residential | Construction
Classifications of loans
Total loans	236,437	211,011
Loans Receivable | Consumer
Classifications of loans
Total loans	$ 128,232	$ 122,013

Loans and Leases and Allowanc_4

Loans and Leases and Allowance for Credit Losses - Changes in the value of the accretable yield for PCI loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 26,868	$ 17,686
Additions due to acquisitions	1,300	1,977
Accretion	(17,885)	(13,696)
Reclassification from nonaccretable difference	9,237	15,326
Changes in expected cash flows that do not affect nonaccretable difference	4,400	5,575
Balance at end of period	$ 23,920	$ 26,868

Loans and Leases and Allowanc_5

Loans and Leases and Allowance for Credit Losses - Components of net investment in leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Minimum future lease payments receivable	$ 39,709	$ 31,915
Estimated residual value of leased equipment	3,631	3,593
Initial direct costs	842	827
Security deposits	(989)	(1,189)
Purchase accounting premium	273	806
Unearned income	(6,088)	(5,568)
Net investment in leases	$ 37,378	$ 30,384

Loans and Leases and Allowanc_6

Loans and Leases and Allowance for Credit Losses - Minimum future lease payments to be received (Details) $ in Thousands	Dec. 31, 2019USD ($)
Receivables [Abstract]
2020	$ 14,772
2021	11,177
2022	7,549
2023	4,436
2024	1,462
Thereafter	313
Total	$ 39,709

Loans and Leases and Allowanc_7

Loans and Leases and Allowance for Credit Losses - Balance and activity in allowance for credit losses by portfolio segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 64,613	$ 61,226	$ 63,424
Charge-Offs	(18,017)	(13,158)	(12,202)
Recoveries	5,801	7,045	6,204
Provision	13,150	9,500	3,800
Ending Balance	65,547	64,613	61,226
Allowance for unfunded commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	3,410
Ending Balance	3,458	3,410
Loans Receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	61,203	58,914	61,422
Charge-Offs	(18,017)	(13,158)	(12,202)
Recoveries	5,801	7,045	6,204
Provision	13,102	8,402	3,490
Ending Balance	62,089	61,203	58,914
Loans Receivable | Indirect auto
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	999	1,550	1,802
Charge-Offs	(663)	(1,277)	(1,420)
Recoveries	186	228	284
Provision	(522)	498	884
Ending Balance	0	999	1,550
Loans Receivable | Commercial | Owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	12,207	14,776	16,446
Charge-Offs	(5)	(303)	(406)
Recoveries	375	1,227	980
Provision	(1,173)	(3,493)	(2,244)
Ending Balance	11,404	12,207	14,776
Loans Receivable | Commercial | Income producing commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	11,073	9,381	8,843
Charge-Offs	(1,227)	(3,304)	(2,985)
Recoveries	283	1,064	178
Provision	2,177	3,932	3,345
Ending Balance	12,306	11,073	9,381
Loans Receivable | Commercial | Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,802	3,971	3,810
Charge-Offs	(5,849)	(1,669)	(1,528)
Recoveries	852	1,390	1,768
Provision	5,461	1,110	(79)
Ending Balance	5,266	4,802	3,971
Loans Receivable | Commercial | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	10,337	10,523	13,405
Charge-Offs	(290)	(622)	(1,023)
Recoveries	1,165	734	1,018
Provision	(1,544)	(298)	(2,877)
Ending Balance	9,668	10,337	10,523
Loans Receivable | Commercial | Equipment financing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	5,452	0	0
Charge-Offs	(5,675)	(1,536)	0
Recoveries	781	460	0
Provision	6,826	6,528	0
Ending Balance	7,384	5,452	0
Loans Receivable | Residential | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,433	2,729	3,264
Charge-Offs	(306)	(54)	(129)
Recoveries	157	376	178
Provision	220	(618)	(584)
Ending Balance	2,504	2,433	2,729
Loans Receivable | Residential | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	8,295	10,097	8,545
Charge-Offs	(616)	(754)	(1,473)
Recoveries	481	336	314
Provision	(79)	(1,384)	2,711
Ending Balance	8,081	8,295	10,097
Loans Receivable | Residential | Home equity lines of credit
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,752	5,177	4,599
Charge-Offs	(996)	(1,194)	(1,435)
Recoveries	610	423	567
Provision	209	346	1,446
Ending Balance	4,575	4,752	5,177
Loans Receivable | Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	853	710	708
Charge-Offs	(2,390)	(2,445)	(1,803)
Recoveries	911	807	917
Provision	1,527	1,781	888
Ending Balance	901	853	710
Loans Receivable | Allowance for unfunded commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	3,410	2,312	2,002
Charge-Offs	0	0	0
Recoveries	0	0	0
Provision	48	1,098	310
Ending Balance	$ 3,458	$ 3,410	$ 2,312

Loans and Leases and Allowanc_8

Loans and Leases and Allowance for Credit Losses - Recorded investment in loans by portfolio segment and the balance of the allowance for loan losses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	$ 2,512	$ 2,312
Allowance for Credit Losses, Collectively evaluated for impairment	62,672	61,541
Allowance for Credit Losses, PCI	363	760
Allowance for Credit Losses, Ending balance	65,547	64,613	$ 61,226	$ 63,424
Loans Outstanding, Ending Balance	8,812,553	8,383,401
Allowance for unfunded commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	0	0
Allowance for Credit Losses, Collectively evaluated for impairment	3,458	3,410
Allowance for Credit Losses, PCI	0	0
Allowance for Credit Losses, Ending balance	3,458	3,410
Loans Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	2,512	2,312
Allowance for Credit Losses, Collectively evaluated for impairment	59,214	58,131
Allowance for Credit Losses, PCI	363	760
Allowance for Credit Losses, Ending balance	62,089	61,203	58,914	61,422
Loans Outstanding, Individually evaluated for impairment	61,971	55,449
Loans Outstanding, Collectively evaluated for impairment	8,691,936	8,253,503
PCI Loans	58,646	74,449
Loans Outstanding, Ending Balance	8,812,553	8,383,401
Loans Receivable | Indirect auto
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	0	26
Allowance for Credit Losses, Collectively evaluated for impairment	0	973
Allowance for Credit Losses, PCI	0	0
Allowance for Credit Losses, Ending balance	0	999	1,550	1,802
Loans Outstanding, Individually evaluated for impairment	0	1,237
Loans Outstanding, Collectively evaluated for impairment	0	206,455
PCI Loans	0	0
Loans Outstanding, Ending Balance	0	207,692
Loans Receivable | Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
PCI Loans	46,947	62,420
Loans Outstanding, Ending Balance	6,669,593	6,099,443
Loans Receivable | Commercial | Owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	816	862
Allowance for Credit Losses, Collectively evaluated for impairment	10,483	11,328
Allowance for Credit Losses, PCI	105	17
Allowance for Credit Losses, Ending balance	11,404	12,207	14,776	16,446
Loans Outstanding, Individually evaluated for impairment	19,233	17,602
Loans Outstanding, Collectively evaluated for impairment	1,692,448	1,620,450
PCI Loans	8,546	9,852
Loans Outstanding, Ending Balance	1,720,227	1,647,904
Loans Receivable | Commercial | Income producing commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	770	402
Allowance for Credit Losses, Collectively evaluated for impairment	11,507	10,671
Allowance for Credit Losses, PCI	29	0
Allowance for Credit Losses, Ending balance	12,306	11,073	9,381	8,843
Loans Outstanding, Individually evaluated for impairment	18,134	16,584
Loans Outstanding, Collectively evaluated for impairment	1,962,588	1,757,525
PCI Loans	27,228	38,311
Loans Outstanding, Ending Balance	2,007,950	1,812,420
Loans Receivable | Commercial | Commercial & industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	21	32
Allowance for Credit Losses, Collectively evaluated for impairment	5,193	4,761
Allowance for Credit Losses, PCI	52	9
Allowance for Credit Losses, Ending balance	5,266	4,802	3,971	3,810
Loans Outstanding, Individually evaluated for impairment	1,449	1,621
Loans Outstanding, Collectively evaluated for impairment	1,218,882	1,276,318
PCI Loans	326	408
Loans Outstanding, Ending Balance	1,220,657	1,278,347
Loans Receivable | Commercial | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	55	71
Allowance for Credit Losses, Collectively evaluated for impairment	9,613	9,974
Allowance for Credit Losses, PCI	0	292
Allowance for Credit Losses, Ending balance	9,668	10,337	10,523	13,405
Loans Outstanding, Individually evaluated for impairment	3,675	2,491
Loans Outstanding, Collectively evaluated for impairment	965,678	787,760
PCI Loans	6,862	5,907
Loans Outstanding, Ending Balance	976,215	796,158
Loans Receivable | Commercial | Equipment financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	0	0
Allowance for Credit Losses, Collectively evaluated for impairment	7,240	5,045
Allowance for Credit Losses, PCI	144	407
Allowance for Credit Losses, Ending balance	7,384	5,452	0	0
Loans Outstanding, Individually evaluated for impairment	1,027	0
Loans Outstanding, Collectively evaluated for impairment	739,532	556,672
PCI Loans	3,985	7,942
Loans Outstanding, Ending Balance	744,544	564,614
Loans Receivable | Residential | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	47	51
Allowance for Credit Losses, Collectively evaluated for impairment	2,456	2,382
Allowance for Credit Losses, PCI	1	0
Allowance for Credit Losses, Ending balance	2,504	2,433	2,729	3,264
Loans Outstanding, Individually evaluated for impairment	1,256	1,207
Loans Outstanding, Collectively evaluated for impairment	234,807	209,070
PCI Loans	374	734
Loans Outstanding, Ending Balance	236,437	211,011
Loans Receivable | Residential | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	782	861
Allowance for Credit Losses, Collectively evaluated for impairment	7,296	7,410
Allowance for Credit Losses, PCI	3	24
Allowance for Credit Losses, Ending balance	8,081	8,295	10,097	8,545
Loans Outstanding, Individually evaluated for impairment	15,991	14,220
Loans Outstanding, Collectively evaluated for impairment	1,092,046	1,025,862
PCI Loans	9,579	9,150
Loans Outstanding, Ending Balance	1,117,616	1,049,232
Loans Receivable | Residential | Home equity lines of credit
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	16	1
Allowance for Credit Losses, Collectively evaluated for impairment	4,541	4,740
Allowance for Credit Losses, PCI	18	11
Allowance for Credit Losses, Ending balance	4,575	4,752	5,177	4,599
Loans Outstanding, Individually evaluated for impairment	992	276
Loans Outstanding, Collectively evaluated for impairment	658,273	692,122
PCI Loans	1,410	1,612
Loans Outstanding, Ending Balance	660,675	694,010
Loans Receivable | Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Individually evaluated for impairment	5	6
Allowance for Credit Losses, Collectively evaluated for impairment	885	847
Allowance for Credit Losses, PCI	11	0
Allowance for Credit Losses, Ending balance	901	853	710	708
Loans Outstanding, Individually evaluated for impairment	214	211
Loans Outstanding, Collectively evaluated for impairment	127,682	121,269
PCI Loans	336	533
Loans Outstanding, Ending Balance	128,232	122,013
Loans Receivable | Allowance for unfunded commitments
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Credit Losses, Ending balance	$ 3,458	$ 3,410	$ 2,312	$ 2,002

Loans and Leases and Allowanc_9

Loans and Leases and Allowance for Credit Losses - Loans individually evaluated for impairment by class of loans (Details) - Loans Receivable - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	$ 28,590	$ 26,829
Unpaid Principal Balance, With an allowance recorded	37,395	32,995
Unpaid Principal Balance	65,985	59,824
Recorded Investment
Recorded Investment, With no related allowance recorded	25,107	23,477
Recorded Investment, With an allowance recorded	36,864	31,972
Recorded Investment	61,971	55,449
Allowance for loan losses, With an allowance recorded	2,512	2,312
Indirect auto
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	0	294
Unpaid Principal Balance, With an allowance recorded	0	946
Recorded Investment
Recorded Investment, With no related allowance recorded	0	292
Recorded Investment, With an allowance recorded	0	945
Allowance for loan losses, With an allowance recorded	0	26
Commercial
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	19,315	19,846
Unpaid Principal Balance, With an allowance recorded	26,821	21,845
Recorded Investment
Recorded Investment, With no related allowance recorded	17,131	17,304
Recorded Investment, With an allowance recorded	26,387	20,994
Allowance for loan losses, With an allowance recorded	1,662	1,367
Commercial | Owner occupied commercial real estate
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	9,527	8,650
Unpaid Principal Balance, With an allowance recorded	11,136	11,095
Recorded Investment
Recorded Investment, With no related allowance recorded	8,118	6,546
Recorded Investment, With an allowance recorded	11,115	11,056
Allowance for loan losses, With an allowance recorded	816	862
Commercial | Income producing commercial real estate
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	5,159	9,986
Unpaid Principal Balance, With an allowance recorded	13,591	6,968
Recorded Investment
Recorded Investment, With no related allowance recorded	4,956	9,881
Recorded Investment, With an allowance recorded	13,178	6,703
Allowance for loan losses, With an allowance recorded	770	402
Commercial | Commercial & industrial
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	1,144	525
Unpaid Principal Balance, With an allowance recorded	559	1,652
Recorded Investment
Recorded Investment, With no related allowance recorded	890	370
Recorded Investment, With an allowance recorded	559	1,251
Allowance for loan losses, With an allowance recorded	21	32
Commercial | Construction Loans
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	2,458	685
Unpaid Principal Balance, With an allowance recorded	1,535	2,130
Recorded Investment
Recorded Investment, With no related allowance recorded	2,140	507
Recorded Investment, With an allowance recorded	1,535	1,984
Allowance for loan losses, With an allowance recorded	55	71
Commercial | Equipment financing
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	1,027	0
Unpaid Principal Balance, With an allowance recorded	0	0
Recorded Investment
Recorded Investment, With no related allowance recorded	1,027	0
Recorded Investment, With an allowance recorded	0	0
Allowance for loan losses, With an allowance recorded	0	0
Residential | Construction Loans
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	731	554
Unpaid Principal Balance, With an allowance recorded	643	791
Recorded Investment
Recorded Investment, With no related allowance recorded	626	428
Recorded Investment, With an allowance recorded	630	779
Allowance for loan losses, With an allowance recorded	47	51
Residential | Residential mortgage
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	7,362	5,787
Unpaid Principal Balance, With an allowance recorded	9,624	9,169
Recorded Investment
Recorded Investment, With no related allowance recorded	6,436	5,202
Recorded Investment, With an allowance recorded	9,555	9,018
Allowance for loan losses, With an allowance recorded	782	861
Residential | Home equity lines of credit
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	1,116	330
Unpaid Principal Balance, With an allowance recorded	146	45
Recorded Investment
Recorded Investment, With no related allowance recorded	861	234
Recorded Investment, With an allowance recorded	131	42
Allowance for loan losses, With an allowance recorded	16	1
Consumer
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	66	18
Unpaid Principal Balance, With an allowance recorded	161	199
Recorded Investment
Recorded Investment, With no related allowance recorded	53	17
Recorded Investment, With an allowance recorded	161	194
Allowance for loan losses, With an allowance recorded	$ 5	$ 6

Loans and Leases and Allowan_10

Loans and Leases and Allowance for Credit Losses - Loans modified under terms of TDR (Details) - Loans Receivable $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)contract	Dec. 31, 2018USD ($)contract	Dec. 31, 2017USD ($)contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	55	64	78
Pre-Modification Outstanding Recorded Investment	$ 14,688	$ 7,971	$ 7,168
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 14,340	$ 7,798	$ 6,506
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	2	6	4
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 148	$ 2,205	$ 852
Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	236	40
Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	14,005	6,858	4,611
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 335	$ 704	$ 1,855
Indirect auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	15	35	34
Pre-Modification Outstanding Recorded Investment	$ 271	$ 643	$ 786
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 262	$ 643	$ 786
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Indirect auto | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Indirect auto | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Indirect auto | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 262	$ 643	$ 786
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	18	9	14
Pre-Modification Outstanding Recorded Investment	$ 12,197	$ 5,299	$ 3,761
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 11,905	$ 5,162	$ 3,228
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	5	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 2,104	$ 0
Commercial | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	106	0
Commercial | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	11,898	5,056	2,335
Commercial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 7	$ 0	$ 893
Commercial | Owner occupied commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	4	5	6
Pre-Modification Outstanding Recorded Investment	$ 1,864	$ 1,438	$ 2,603
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 1,739	$ 1,387	$ 2,269
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	3	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 1,869	$ 0
Commercial | Owner occupied commercial real estate | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Owner occupied commercial real estate | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	1,739	1,387	2,161
Commercial | Owner occupied commercial real estate | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 108
Commercial | Income producing commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	3	2	2
Pre-Modification Outstanding Recorded Investment	$ 9,126	$ 3,753	$ 257
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 9,013	$ 3,743	$ 252
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Commercial | Income producing commercial real estate | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	106	0
Commercial | Income producing commercial real estate | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	9,013	3,637	0
Commercial | Income producing commercial real estate | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 252
Commercial | Commercial & industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2	2	6
Pre-Modification Outstanding Recorded Investment	$ 136	$ 108	$ 901
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 82	$ 32	$ 707
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	1	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 232	$ 0
Commercial | Commercial & industrial | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Commercial & industrial | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	75	32	174
Commercial | Commercial & industrial | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 7	$ 0	$ 533
Commercial | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 0
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	1	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 3	$ 0
Commercial | Construction | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Construction | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Construction | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 0
Commercial | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	9	0	0
Pre-Modification Outstanding Recorded Investment	$ 1,071	$ 0	$ 0
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 1,071	$ 0	$ 0
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Commercial | Equipment financing | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Commercial | Equipment financing | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	1,071	0	0
Commercial | Equipment financing | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 0
Residential | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1	2	4
Pre-Modification Outstanding Recorded Investment	$ 22	$ 47	$ 135
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 21	$ 45	$ 135
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	1	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 13	$ 0	$ 0
Residential | Construction | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	40
Residential | Construction | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	32	95
Residential | Construction | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 21	$ 13	$ 0
Residential | Residential mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	15	15	23
Pre-Modification Outstanding Recorded Investment	$ 2,102	$ 1,933	$ 2,174
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 2,057	$ 1,900	$ 2,165
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	1	1	4
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 135	$ 101	$ 852
Residential | Residential mortgage | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	130	0
Residential | Residential mortgage | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	2,057	1,770	2,165
Residential | Residential mortgage | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 0	$ 0
Residential | Home equity lines of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1	1	1
Pre-Modification Outstanding Recorded Investment	$ 50	$ 42	$ 296
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 50	$ 41	$ 176
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Residential | Home equity lines of credit | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Residential | Home equity lines of credit | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	50	0	0
Residential | Home equity lines of credit | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 0	$ 41	$ 176
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	5	2	2
Pre-Modification Outstanding Recorded Investment	$ 46	$ 7	$ 16
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 45	$ 7	$ 16
Troubled Debt Restructurings That Have Subsequently Defaulted, Number of Contracts | contract	0	0	0
Troubled Debt Restructurings That Have Subsequently Defaulted, Recorded Investment	$ 0	$ 0	$ 0
Consumer | Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	0
Consumer | Structure
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	0	0	16
Consumer | Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post-Modification Outstanding Recorded Investment by Type of Modification	$ 45	$ 7	$ 0

Loans and Leases and Allowan_11

Loans and Leases and Allowance for Credit Losses - Average balances of impaired loans and income recognized on impaired loans (Details) - Loans Receivable - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Average balances of impaired loans and income recognized on impaired loans
Average Balance	$ 57,223	$ 59,748	$ 78,354
Interest Revenue Recognized During Impairment	3,018	3,084	3,632
Cash Basis Interest Revenue Received	3,093	3,124	3,592
Indirect auto
Average balances of impaired loans and income recognized on impaired loans
Average Balance	1,028	1,252	1,244
Interest Revenue Recognized During Impairment	50	64	64
Cash Basis Interest Revenue Received	50	64	64
Commercial
Average balances of impaired loans and income recognized on impaired loans
Average Balance	38,057	42,043	60,731
Interest Revenue Recognized During Impairment	2,099	2,247	2,886
Cash Basis Interest Revenue Received	2,170	2,288	2,825
Commercial | Owner occupied commercial real estate
Average balances of impaired loans and income recognized on impaired loans
Average Balance	18,575	19,881	27,870
Interest Revenue Recognized During Impairment	1,124	1,078	1,271
Cash Basis Interest Revenue Received	1,171	1,119	1,291
Commercial | Income producing commercial real estate
Average balances of impaired loans and income recognized on impaired loans
Average Balance	14,253	17,138	24,765
Interest Revenue Recognized During Impairment	739	893	1,265
Cash Basis Interest Revenue Received	730	895	1,178
Commercial | Commercial & industrial
Average balances of impaired loans and income recognized on impaired loans
Average Balance	1,837	1,777	2,994
Interest Revenue Recognized During Impairment	84	100	125
Cash Basis Interest Revenue Received	100	100	127
Commercial | Construction
Average balances of impaired loans and income recognized on impaired loans
Average Balance	3,233	3,247	5,102
Interest Revenue Recognized During Impairment	129	176	225
Cash Basis Interest Revenue Received	146	174	229
Commercial | Equipment financing
Average balances of impaired loans and income recognized on impaired loans
Average Balance	159	0	0
Interest Revenue Recognized During Impairment	23	0	0
Cash Basis Interest Revenue Received	23	0	0
Residential | Construction
Average balances of impaired loans and income recognized on impaired loans
Average Balance	1,332	1,405	1,582
Interest Revenue Recognized During Impairment	92	96	95
Cash Basis Interest Revenue Received	94	95	95
Residential | Residential mortgage
Average balances of impaired loans and income recognized on impaired loans
Average Balance	16,115	14,515	14,257
Interest Revenue Recognized During Impairment	748	641	555
Cash Basis Interest Revenue Received	749	643	574
Residential | Home equity lines of credit
Average balances of impaired loans and income recognized on impaired loans
Average Balance	488	284	248
Interest Revenue Recognized During Impairment	14	18	10
Cash Basis Interest Revenue Received	15	16	12
Consumer
Average balances of impaired loans and income recognized on impaired loans
Average Balance	203	249	292
Interest Revenue Recognized During Impairment	15	18	22
Cash Basis Interest Revenue Received	$ 15	$ 18	$ 22

Loans and Leases and Allowan_12

Loans and Leases and Allowance for Credit Losses - Recorded investment in nonaccrual loans by loan class (Details) - Loans Receivable - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	$ 35,341	$ 23,778
Indirect auto
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	0	726
Commercial
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	20,503	12,280
Commercial | Owner occupied commercial real estate
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	10,544	6,421
Commercial | Income producing commercial real estate
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	1,996	1,160
Commercial | Commercial & industrial
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	2,545	1,417
Commercial | Construction
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	2,277	605
Commercial | Equipment financing
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	3,141	2,677
Residential | Construction
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	939	288
Residential | Residential mortgage
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	10,567	8,035
Residential | Home equity lines of credit
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	3,173	2,360
Consumer
Recorded investment in nonaccrual loans by loan class
Nonaccrual Loans	$ 159	$ 89

Loans and Leases and Allowan_13

Loans and Leases and Allowance for Credit Losses - Aging of recorded investment in past due loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Recorded investment in nonaccrual loans by loan class
Loans Outstanding, Ending Balance	$ 8,812,553	$ 8,383,401
Loans Receivable
Recorded investment in nonaccrual loans by loan class
Loans Past Due	41,240	38,304
Loans Not Past Due	8,712,667	8,270,648
PCI Loans	58,646	74,449
Loans Outstanding, Ending Balance	8,812,553	8,383,401
Loans Receivable | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	17,892	22,405
Loans Receivable | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	7,623	7,765
Loans Receivable | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	15,725	8,134
Loans Receivable | Indirect auto
Recorded investment in nonaccrual loans by loan class
Loans Past Due		1,706
Loans Not Past Due		205,986
PCI Loans	0	0
Loans Outstanding, Ending Balance	0	207,692
Loans Receivable | Indirect auto | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due		750
Loans Receivable | Indirect auto | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due		323
Loans Receivable | Indirect auto | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due		633
Loans Receivable | Commercial
Recorded investment in nonaccrual loans by loan class
Loans Past Due	25,971	22,056
Loans Not Past Due	6,596,675	6,014,967
PCI Loans	46,947	62,420
Loans Outstanding, Ending Balance	6,669,593	6,099,443
Loans Receivable | Commercial | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	9,547	12,973
Loans Receivable | Commercial | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	4,684	4,645
Loans Receivable | Commercial | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	11,740	4,438
Loans Receivable | Commercial | Owner occupied commercial real estate
Recorded investment in nonaccrual loans by loan class
Loans Past Due	10,999	6,450
Loans Not Past Due	1,700,682	1,631,602
PCI Loans	8,546	9,852
Loans Outstanding, Ending Balance	1,720,227	1,647,904
Loans Receivable | Commercial | Owner occupied commercial real estate | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	2,913	2,542
Loans Receivable | Commercial | Owner occupied commercial real estate | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	2,007	2,897
Loans Receivable | Commercial | Owner occupied commercial real estate | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	6,079	1,011
Loans Receivable | Commercial | Income producing commercial real estate
Recorded investment in nonaccrual loans by loan class
Loans Past Due	1,669	2,216
Loans Not Past Due	1,979,053	1,771,893
PCI Loans	27,228	38,311
Loans Outstanding, Ending Balance	2,007,950	1,812,420
Loans Receivable | Commercial | Income producing commercial real estate | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	562	1,624
Loans Receivable | Commercial | Income producing commercial real estate | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	706	291
Loans Receivable | Commercial | Income producing commercial real estate | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	401	301
Loans Receivable | Commercial | Commercial & industrial
Recorded investment in nonaccrual loans by loan class
Loans Past Due	4,750	8,307
Loans Not Past Due	1,215,581	1,269,632
PCI Loans	326	408
Loans Outstanding, Ending Balance	1,220,657	1,278,347
Loans Receivable | Commercial | Commercial & industrial | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	2,140	7,189
Loans Receivable | Commercial | Commercial & industrial | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	491	718
Loans Receivable | Commercial | Commercial & industrial | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	2,119	400
Loans Receivable | Commercial | Construction
Recorded investment in nonaccrual loans by loan class
Loans Past Due	2,520	335
Loans Not Past Due	966,833	789,916
PCI Loans	6,862	5,907
Loans Outstanding, Ending Balance	976,215	796,158
Loans Receivable | Commercial | Construction | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	1,867	267
Loans Receivable | Commercial | Construction | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	557	0
Loans Receivable | Commercial | Construction | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	96	68
Loans Receivable | Commercial | Equipment financing
Recorded investment in nonaccrual loans by loan class
Loans Past Due	6,033	4,748
Loans Not Past Due	734,526	551,924
PCI Loans	3,985	7,942
Loans Outstanding, Ending Balance	744,544	564,614
Loans Receivable | Commercial | Equipment financing | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	2,065	1,351
Loans Receivable | Commercial | Equipment financing | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	923	739
Loans Receivable | Commercial | Equipment financing | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	3,045	2,658
Loans Receivable | Residential | Construction
Recorded investment in nonaccrual loans by loan class
Loans Past Due	852	762
Loans Not Past Due	235,211	209,515
PCI Loans	374	734
Loans Outstanding, Ending Balance	236,437	211,011
Loans Receivable | Residential | Construction | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	325	509
Loans Receivable | Residential | Construction | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	125	63
Loans Receivable | Residential | Construction | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	402	190
Loans Receivable | Residential | Residential mortgage
Recorded investment in nonaccrual loans by loan class
Loans Past Due	10,038	9,199
Loans Not Past Due	1,097,999	1,030,883
PCI Loans	9,579	9,150
Loans Outstanding, Ending Balance	1,117,616	1,049,232
Loans Receivable | Residential | Residential mortgage | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	5,655	5,461
Loans Receivable | Residential | Residential mortgage | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	2,212	1,788
Loans Receivable | Residential | Residential mortgage | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	2,171	1,950
Loans Receivable | Residential | Home equity lines of credit
Recorded investment in nonaccrual loans by loan class
Loans Past Due	3,503	3,878
Loans Not Past Due	655,762	688,520
PCI Loans	1,410	1,612
Loans Outstanding, Ending Balance	660,675	694,010
Loans Receivable | Residential | Home equity lines of credit | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	1,697	2,112
Loans Receivable | Residential | Home equity lines of credit | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	421	864
Loans Receivable | Residential | Home equity lines of credit | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	1,385	902
Loans Receivable | Consumer
Recorded investment in nonaccrual loans by loan class
Loans Past Due	876	703
Loans Not Past Due	127,020	120,777
PCI Loans	336	533
Loans Outstanding, Ending Balance	128,232	122,013
Loans Receivable | Consumer | Loans Past Due, 30 - 59 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	668	600
Loans Receivable | Consumer | Loans Past Due, 60 - 89 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	181	82
Loans Receivable | Consumer | Loans Past Due, > 90 Days
Recorded investment in nonaccrual loans by loan class
Loans Past Due	$ 27	$ 21

Loans and Leases and Allowan_14

Loans and Leases and Allowance for Credit Losses - Risk category of loans by class of loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Risk category of loans by class of loans
Total loans	$ 8,812,553	$ 8,383,401
Pass
Risk category of loans by class of loans
Total loans	8,558,459	8,201,872
Watch
Risk category of loans by class of loans
Total loans	93,703	66,969
Substandard
Risk category of loans by class of loans
Total loans	160,391	114,560
Doubtful / Loss
Risk category of loans by class of loans
Total loans	0	0
Loans Receivable
Risk category of loans by class of loans
Total loans, excluding PCI loans	8,753,907	8,308,952
Carrying value of PCI loans	58,646	74,449
Total loans	8,812,553	8,383,401
Loans Receivable | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	8,517,776	8,154,010
Carrying value of PCI loans	40,683	47,862
Loans Receivable | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	83,930	50,556
Carrying value of PCI loans	9,773	16,413
Loans Receivable | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	152,201	104,386
Carrying value of PCI loans	8,190	10,174
Loans Receivable | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Indirect auto
Risk category of loans by class of loans
Total loans, excluding PCI loans		207,692
Carrying value of PCI loans	0	0
Total loans	0	207,692
Loans Receivable | Indirect auto | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans		205,632
Carrying value of PCI loans		0
Loans Receivable | Indirect auto | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans		0
Carrying value of PCI loans		0
Loans Receivable | Indirect auto | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans		2,060
Carrying value of PCI loans		0
Loans Receivable | Indirect auto | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans		0
Carrying value of PCI loans		0
Loans Receivable | Commercial
Risk category of loans by class of loans
Total loans, excluding PCI loans	6,622,646	6,037,023
Carrying value of PCI loans	46,947	62,420
Total loans	6,669,593	6,099,443
Loans Receivable | Commercial | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	6,406,957	5,900,234
Carrying value of PCI loans	30,570	38,276
Loans Receivable | Commercial | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	83,922	50,537
Carrying value of PCI loans	9,773	16,413
Loans Receivable | Commercial | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	131,767	86,252
Carrying value of PCI loans	6,604	7,731
Loans Receivable | Commercial | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Commercial | Owner occupied commercial real estate
Risk category of loans by class of loans
Total loans, excluding PCI loans	1,711,681	1,638,052
Carrying value of PCI loans	8,546	9,852
Total loans	1,720,227	1,647,904
Loans Receivable | Commercial | Owner occupied commercial real estate | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	1,638,398	1,585,797
Carrying value of PCI loans	3,238	3,352
Loans Receivable | Commercial | Owner occupied commercial real estate | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	24,563	16,651
Carrying value of PCI loans	2,797	2,774
Loans Receivable | Commercial | Owner occupied commercial real estate | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	48,720	35,604
Carrying value of PCI loans	2,511	3,726
Loans Receivable | Commercial | Owner occupied commercial real estate | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Commercial | Income producing commercial real estate
Risk category of loans by class of loans
Total loans, excluding PCI loans	1,980,722	1,774,109
Carrying value of PCI loans	27,228	38,311
Total loans	2,007,950	1,812,420
Loans Receivable | Commercial | Income producing commercial real estate | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	1,914,524	1,735,456
Carrying value of PCI loans	19,648	23,430
Loans Receivable | Commercial | Income producing commercial real estate | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	40,676	20,923
Carrying value of PCI loans	6,305	13,403
Loans Receivable | Commercial | Income producing commercial real estate | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	25,522	17,730
Carrying value of PCI loans	1,275	1,478
Loans Receivable | Commercial | Income producing commercial real estate | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Commercial | Commercial & industrial
Risk category of loans by class of loans
Total loans, excluding PCI loans	1,220,331	1,277,939
Carrying value of PCI loans	326	408
Total loans	1,220,657	1,278,347
Loans Receivable | Commercial | Commercial & industrial | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	1,156,366	1,247,206
Carrying value of PCI loans	104	266
Loans Receivable | Commercial | Commercial & industrial | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	16,385	8,430
Carrying value of PCI loans	81	48
Loans Receivable | Commercial | Commercial & industrial | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	47,580	22,303
Carrying value of PCI loans	141	94
Loans Receivable | Commercial | Commercial & industrial | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Commercial | Construction
Risk category of loans by class of loans
Total loans, excluding PCI loans	969,353	790,251
Carrying value of PCI loans	6,862	5,907
Total loans	976,215	796,158
Loans Receivable | Commercial | Construction | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	960,251	777,780
Carrying value of PCI loans	3,628	3,503
Loans Receivable | Commercial | Construction | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	2,298	4,533
Carrying value of PCI loans	590	188
Loans Receivable | Commercial | Construction | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	6,804	7,938
Carrying value of PCI loans	2,644	2,216
Loans Receivable | Commercial | Construction | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Commercial | Equipment financing
Risk category of loans by class of loans
Total loans, excluding PCI loans	740,559	556,672
Carrying value of PCI loans	3,985	7,942
Total loans	744,544	564,614
Loans Receivable | Commercial | Equipment financing | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	737,418	553,995
Carrying value of PCI loans	3,952	7,725
Loans Receivable | Commercial | Equipment financing | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Commercial | Equipment financing | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	3,141	2,677
Carrying value of PCI loans	33	217
Loans Receivable | Commercial | Equipment financing | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Residential | Construction
Risk category of loans by class of loans
Total loans, excluding PCI loans	236,063	210,277
Carrying value of PCI loans	374	734
Total loans	236,437	211,011
Loans Receivable | Residential | Construction | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	234,791	209,744
Carrying value of PCI loans	348	687
Loans Receivable | Residential | Construction | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Residential | Construction | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	1,272	533
Carrying value of PCI loans	26	47
Loans Receivable | Residential | Construction | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Residential | Residential mortgage
Risk category of loans by class of loans
Total loans, excluding PCI loans	1,108,037	1,040,082
Carrying value of PCI loans	9,579	9,150
Total loans	1,117,616	1,049,232
Loans Receivable | Residential | Residential mortgage | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	1,093,902	1,028,660
Carrying value of PCI loans	8,112	6,914
Loans Receivable | Residential | Residential mortgage | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Residential | Residential mortgage | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	14,135	11,422
Carrying value of PCI loans	1,467	2,236
Loans Receivable | Residential | Residential mortgage | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Residential | Home equity lines of credit
Risk category of loans by class of loans
Total loans, excluding PCI loans	659,265	692,398
Carrying value of PCI loans	1,410	1,612
Total loans	660,675	694,010
Loans Receivable | Residential | Home equity lines of credit | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	654,619	688,493
Carrying value of PCI loans	1,350	1,492
Loans Receivable | Residential | Home equity lines of credit | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Residential | Home equity lines of credit | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	4,646	3,905
Carrying value of PCI loans	60	120
Loans Receivable | Residential | Home equity lines of credit | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	0	0
Loans Receivable | Consumer
Risk category of loans by class of loans
Total loans, excluding PCI loans	127,896	121,480
Carrying value of PCI loans	336	533
Total loans	128,232	122,013
Loans Receivable | Consumer | Pass
Risk category of loans by class of loans
Total loans, excluding PCI loans	127,507	121,247
Carrying value of PCI loans	303	493
Loans Receivable | Consumer | Watch
Risk category of loans by class of loans
Total loans, excluding PCI loans	8	19
Carrying value of PCI loans	0	0
Loans Receivable | Consumer | Substandard
Risk category of loans by class of loans
Total loans, excluding PCI loans	381	214
Carrying value of PCI loans	33	40
Loans Receivable | Consumer | Doubtful / Loss
Risk category of loans by class of loans
Total loans, excluding PCI loans	0	0
Carrying value of PCI loans	$ 0	$ 0

Loans and Leases and Allowan_15

Loans and Leases and Allowance for Credit Losses - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Remaining accretable fair value mark on loans	$ 5,000,000	$ 4,310,000
Criteria amount for evaluation of impairment	500,000
Specific reserves	2,510,000	2,310,000
Commitments to lend additional amounts to customers with outstanding loans classified as TDRs	0	0
Gross additional interest income that would have been earned if the nonaccrual loans had performed as per original term	1,260,000	1,090,000	$ 1,110,000
SBA/USDA guaranteed loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold	81,100,000	121,000,000	$ 117,000,000
Indirect auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold	103,000,000
Equipment financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans sold	31,000,000
FHLB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Pledged as collateral to secure FHLB advances	4,060,000,000	3,980,000,000
Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of PCI loans	58,646,000	74,449,000
Outstanding balance of PCI loans	83,100,000	109,000,000
Loans Receivable | Indirect auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of PCI loans	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Overdrawn deposit accounts	1,300,000	1,190,000
Consumer | Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value of PCI loans	$ 336,000	$ 533,000

Premises and Equipment - Summar

Premises and Equipment - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Premises and equipments
Premises and equipment, gross	$ 351,477	$ 331,250
Less accumulated depreciation	(135,501)	(125,110)
Premises and equipment, net	215,976	206,140
Land and land improvements
Premises and equipments
Premises and equipment, gross	81,150	78,066
Buildings and improvements
Premises and equipments
Premises and equipment, gross	170,629	153,980
Furniture and equipment
Premises and equipments
Premises and equipment, gross	97,997	93,854
Construction in progress
Premises and equipments
Premises and equipment, gross	$ 1,701	$ 5,350

Premises and Equipment - Narrat

Premises and Equipment - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 15.3	$ 14.2	$ 12

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible, net	$ 14,822	$ 16,960
Goodwill	327,425	307,112	$ 220,591
Total goodwill and other intangible assets, net	342,247	324,072
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Intangible, gross	32,802	62,652
Less: accumulated amortization	(17,980)	(46,141)
Intangible, net	14,822	16,511
Noncompete agreement
Finite-Lived Intangible Assets [Line Items]
Intangible, gross	3,144	3,144
Less: accumulated amortization	(3,144)	(2,695)
Intangible, net	$ 0	$ 449

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Changes in carrying amount of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 307,112	$ 220,591
Acquisitions	20,313	87,379
Measurement period adjustments		(858)
Goodwill, ending balance	327,425	307,112
Accumulated impairment losses	(306,000)	(306,000)	$ (306,000)
Gross goodwill	$ 633,000	$ 613,000	$ 526,000

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Estimated aggregate amortization expense for future periods (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 3,842
2021	3,019
2022	2,379
2023	1,852
2024	1,431
Thereafter	2,299
Intangible, net	$ 14,822	$ 16,960

Servicing Assets and Liabilit_3

Servicing Assets and Liabilities - Changes in SBA/USDA loans servicing rights (Details) - SBA/USDA - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]
Servicing rights, beginning of period	$ 7,510	$ 7,740	$ 5,752
Additions:
Acquired servicing rights	0		419
Acquired servicing rights		(354)
Originated servicing rights capitalized upon sale of loans	1,835	2,573	2,737
Subtractions:
Disposals	(1,258)	(810)	(621)
Changes in fair value:
Due to change in valuation inputs or assumptions used in the valuation model	(1,293)	(1,639)	(547)
Servicing rights, end of period	$ 6,794	$ 7,510	$ 7,740

Servicing Assets and Liabilit_4

Servicing Assets and Liabilities - Key characteristics, inputs, and economic assumptions for SBA/USDA loans and related sensitivity (Details) - SBA/USDA - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]
Fair value of retained servicing assets	$ 6,794	$ 7,510	$ 7,740	$ 5,752
Prepayment rate assumption (percent)	16.50%	12.10%
10% adverse change	$ (352)	$ (267)
20% adverse change	$ (671)	$ (515)
Discount rate (percent)	12.30%	14.50%
100 bps adverse change	$ (184)	$ (196)
200 bps adverse change	$ (358)	$ (381)
Weighted-average life (years)	3 years 10 months 24 days	5 years
Weighted-average gross margin (percent)	1.90%	1.90%

Servicing Assets and Liabilit_5

Servicing Assets and Liabilities - Changes in residential mortgage loans servicing rights (Details) - Residential mortgage servicing rights - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]
Servicing rights, beginning of period	$ 11,877	$ 8,262	$ 4,372
Additions:
Originated servicing rights capitalized upon sale of loans	5,783	4,587	3,602
Subtractions:
Disposals	(1,098)	(537)	(328)
Changes in fair value:
Initial election to carry at fair value on January 1, 2017			698
Due to change in inputs or assumptions used in the valuation	(2,997)	(435)	(82)
Servicing rights, end of period	$ 13,565	$ 11,877	$ 8,262

Servicing Assets and Liabilit_6

Servicing Assets and Liabilities - Key characteristics, inputs, and economic assumptions for residential mortgage loans and related sensitivity (Details) - Residential mortgage servicing rights - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]
Fair value of retained servicing assets	$ 13,565	$ 11,877	$ 8,262	$ 4,372
Prepayment rate assumption (percent)	14.10%	10.60%
10% adverse change	$ (662)	$ (466)
20% adverse change	$ (1,270)	$ (898)
Discount rate (percent)	10.00%	10.00%
100 bps adverse change	$ (467)	$ (448)
200 bps adverse change	$ (900)	$ (863)

Servicing Assets and Liabilit_7

Servicing Assets and Liabilities - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Servicing Asset [Line Items]
Servicing liability	$ 363	$ 207
SBA/USDA
Schedule Of Servicing Asset [Line Items]
Servicing of asset for others, amount not included in balance sheet	411,000	386,000
Contractually specified servicing fees earned by United on servicing rights	3,820	3,440	$ 2,600
Residential mortgage servicing rights
Schedule Of Servicing Asset [Line Items]
Servicing of asset for others, amount not included in balance sheet	1,600,000	1,210,000
Contractually specified servicing fees earned by United on servicing rights	3,670	2,370	$ 1,720
Equipment financing loans
Schedule Of Servicing Asset [Line Items]
Servicing of asset for others, amount not included in balance sheet	$ 42,400	$ 28,400

Deposits - Contractual maturiti

Deposits - Contractual maturities of time deposits (Details) $ in Thousands	Dec. 31, 2019USD ($)
Deposits [Abstract]
2020	$ 1,639,355
2021	187,367
2022	41,402
2023	12,451
2024	8,064
thereafter	56,444
Total time deposits	$ 1,945,083

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deposits [Abstract]
Time deposits (excluding brokered time deposits) that met or exceeded FDIC insurance limit	$ 367	$ 262
Brokered deposits, certificates of deposit	85.5	544
Daily average balance of brokered deposits	$ 241	$ 347

Federal Home Loan Bank Advanc_2

Federal Home Loan Bank Advances - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank advances	$ 0	$ 160,000
Federal Home Loan Bank advances, weighted average interest rate (percent)		2.52%

Long-term Debt - Schedule of lo

Long-term Debt - Schedule of long-term debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Less discount	$ (8,588)	$ (9,309)
Long-term debt	212,664	267,189
Securitized notes payable
Debt Instrument [Line Items]
Long-term debt, gross	0	54,996
Securitized notes payable | NER 16-1 Class A-2 notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	19,975
Issue Date	2016
Stated Maturity Date	2021
Interest Rate (percent)	2.20%
Securitized notes payable | NER 16-1 Class B notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	25,489
Issue Date	2016
Stated Maturity Date	2021
Interest Rate (percent)	3.22%
Securitized notes payable | NER 16-1 Class C notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	6,319
Issue Date	2016
Stated Maturity Date	2021
Interest Rate (percent)	5.05%
Securitized notes payable | NER 16-1 Class D notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	3,213
Issue Date	2016
Stated Maturity Date	2023
Interest Rate (percent)	7.87%
Senior debentures
Debt Instrument [Line Items]
Long-term debt, gross	$ 85,000	85,000
Senior debentures | 2022 senior debentures
Debt Instrument [Line Items]
Long-term debt, gross	$ 50,000	50,000
Issue Date	2015
Stated Maturity Date	2022
Earliest Call Date	2020
Interest Rate (percent)	5.00%
Variable rate basis	3-month LIBOR
Senior debentures | 2022 senior debentures | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	3.814%
Senior debentures | 2027 senior debentures
Debt Instrument [Line Items]
Long-term debt, gross	$ 35,000	35,000
Issue Date	2015
Stated Maturity Date	2027
Earliest Call Date	2025
Interest Rate (percent)	5.50%
Variable rate basis	3-month LIBOR
Senior debentures | 2027 senior debentures | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	3.71%
Subordinated debentures
Debt Instrument [Line Items]
Long-term debt, gross	$ 111,250	111,500
Subordinated debentures | 2028 subordinated debentures
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000	100,000
Issue Date	2018
Stated Maturity Date	2028
Earliest Call Date	2023
Interest Rate (percent)	4.50%
Variable rate basis	3-month LIBOR
Subordinated debentures | 2028 subordinated debentures | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2.12%
Subordinated debentures | 2025 subordinated debentures
Debt Instrument [Line Items]
Long-term debt, gross	$ 11,250	11,500
Issue Date	2015
Stated Maturity Date	2025
Earliest Call Date	2020
Interest Rate (percent)	6.25%
Trust preferred securities
Debt Instrument [Line Items]
Long-term debt, gross	$ 25,002	25,002
Trust preferred securities | Southern Bancorp Capital Trust I
Debt Instrument [Line Items]
Long-term debt, gross	$ 4,382	4,382
Issue Date	2004
Stated Maturity Date	2034
Earliest Call Date	2009
Variable rate basis	Prime
Trust preferred securities | Southern Bancorp Capital Trust I | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.00%
Trust preferred securities | Tidelands Statutory Trust I
Debt Instrument [Line Items]
Long-term debt, gross	$ 8,248	8,248
Issue Date	2006
Stated Maturity Date	2036
Earliest Call Date	2011
Variable rate basis	3-month LIBOR
Trust preferred securities | Tidelands Statutory Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.38%
Trust preferred securities | Four Oaks Statutory Trust I
Debt Instrument [Line Items]
Long-term debt, gross	$ 12,372	$ 12,372
Issue Date	2006
Stated Maturity Date	2036
Earliest Call Date	2011
Variable rate basis	3-month LIBOR
Trust preferred securities | Four Oaks Statutory Trust I | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	1.35%

Long-term Debt - Narrative (Det

Long-term Debt - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2019
Senior debentures | 2022 senior debentures
Debt Instrument [Line Items]
Earliest redemption date		Aug. 14, 2020
Redemption price (percent)		100.00%
Maturity date		Feb. 14, 2022
Senior debentures | 2027 senior debentures
Debt Instrument [Line Items]
Earliest redemption date		Aug. 14, 2025
Redemption price (percent)		100.00%
Maturity date		Feb. 14, 2027
Subordinated debentures | 2025 subordinated debentures
Debt Instrument [Line Items]
Maturity date		Nov. 30, 2025
Earliest date allowed for prepayment		Nov. 30, 2020
Aggregate principal amount		$ 11,500,000
Subordinated debentures | 2028 subordinated debentures
Debt Instrument [Line Items]
Maturity date	Jan. 30, 2028
Aggregate principal amount	$ 100,000,000

Operating Leases - Narrative (D

Operating Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Leases [Abstract]
Right-of-use asset			$ 19,900
Lease liability			$ 22,039
Operating lease, weighted average remaining lease term (in years)			5 years 3 months 29 days
Operating lease, weighted average discount rate (percent)			2.79%
Rent Commitments Under Operating Leases Under Topic ASC 840
2019	$ 5,350
2020	5,160
2021	4,910
2022	4,480
2023	3,910
Thereafter	5,040
Rent expense in accordance with ASC 840	$ 4,700	$ 4,320

Operating Leases - Operating le

Operating Leases - Operating lease income and expense and other supplemental information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Operating Lease Income and Expense
Operating lease cost	$ 5,067
Variable lease cost	449
Short-term lease cost	136
Total lease cost	5,652
Sublease income and rental income from owned properties under operating leases	$ 1,160

Operating Leases - Future minim

Operating Leases - Future minimum lease payments (Details) $ in Thousands	Dec. 31, 2019USD ($)
Future Minimum Lease Payments
2020	$ 4,939
2021	5,124
2022	4,694
2023	3,992
2024	1,728
Thereafter	3,364
Total	23,841
Less discount	(1,802)
Present value of lease liability	$ 22,039

Reclassifications Out of Accu_3

Reclassifications Out of Accumulated Other Comprehensive Income - Summary of reclassifications (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities (losses) gains, net	$ (1,021)	$ (656)	$ 42
Investment securities interest revenue	552,706	500,080	389,720
Other expense	(15,092)	(17,194)	(12,962)
Deposit interest expense	(66,856)	(39,543)	(17,062)
Federal Home Loan Bank advances interest expense	(2,697)	(6,345)	(6,095)
Salaries and employee benefits expense	(196,440)	(181,015)	(153,098)
Merger-related and other charges	(6,907)	(5,414)	(13,901)
Income tax benefit (expense)	(52,991)	(49,815)	(105,013)
Net of tax	184,346	164,927	67,250
Reclassifications Out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(2,997)	(2,113)	(4,962)
Reclassifications Out of Accumulated Other Comprehensive Income | Realized gains (losses) on available-for-sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities (losses) gains, net	(1,021)	(656)	42
Income tax benefit (expense)	247	132	(14)
Net of tax	(774)	(524)	28
Reclassifications Out of Accumulated Other Comprehensive Income | Amortization of losses included in net income on available-for-sale securities transferred to held to maturity
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities interest revenue	(383)	(739)	(1,069)
Income tax benefit (expense)	92	180	401
Net of tax	(291)	(559)	(668)
Reclassifications Out of Accumulated Other Comprehensive Income | Amounts included in net income on derivative financial instruments accounted for as cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense	(235)	0	0
Deposit interest expense	(102)	(499)	(599)
Federal Home Loan Bank advances interest expense	0	0	(292)
Total before tax	(337)	(499)	(891)
Income tax benefit (expense)	86	129	346
Net of tax	(251)	(370)	(545)
Reclassifications Out of Accumulated Other Comprehensive Income | Reclassification of disproportionate tax effect related to terminated cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)	0	0	(3,289)
Reclassifications Out of Accumulated Other Comprehensive Income | Prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits expense	(640)	(666)	(560)
Reclassifications Out of Accumulated Other Comprehensive Income | Actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense	(59)	(241)	0
Salaries and employee benefits expense	0	0	(238)
Reclassifications Out of Accumulated Other Comprehensive Income | Termination of funded plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Merger-related and other charges	(1,558)	0	0
Reclassifications Out of Accumulated Other Comprehensive Income | Reclassifications related to defined benefit pension plan activity
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(2,257)	(907)	(798)
Income tax benefit (expense)	576	247	310
Net of tax	$ (1,681)	$ (660)	$ (488)

Earnings Per Share - Computatio

Earnings Per Share - Computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Computation of basic and diluted loss per share
Net income	$ 185,721	$ 166,111	$ 67,821
Dividends and undistributed earnings allocated to unvested shares	(1,375)	(1,184)	(571)
Net income available to common shareholders	$ 184,346	$ 164,927	$ 67,250
Income per common share:
Basic (in dollars per share)	$ 2.31	$ 2.07	$ 0.92
Diluted (in dollars per share)	$ 2.31	$ 2.07	$ 0.92
Weighted average common shares:
Basic (in shares)	79,700	79,662	73,247
Effect of dilutive securities:
Diluted (in shares)	79,708	79,671	73,259
Stock options
Effect of dilutive securities:
Dilutive securities (in shares)	1	7	12
Restricted stock units
Effect of dilutive securities:
Dilutive securities (in shares)	7	2	0

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Exercise of price warrants (in dollars per share)			$ 61.40
Warrant
Class of Stock [Line Items]
Antidilutive securities excluded from computation (in shares)			219,909
Stock options
Class of Stock [Line Items]
Antidilutive securities excluded from computation (in shares)	1,000	32,316	60,287
Weighted average exercise price of stock options (in dollars per share)	$ 30.45
Restricted stock units
Class of Stock [Line Items]
Antidilutive securities excluded from computation (in shares)	183,168		663,817

Income Taxes - Income tax expen

Income Taxes - Income tax expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current	$ 38,082	$ 17,185	$ 5,451
Deferred	14,909	32,630	60,951
Increase in valuation allowance	0	0	413
Expense due to enactment of federal tax reform	0	0	38,198
Total income tax expense	$ 52,991	$ 49,815	$ 105,013

Income Taxes - Differences betw

Income Taxes - Differences between provision for income taxes and amount computed as statutory rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Differences between the provision for income taxes and statutory federal income tax rate
Pretax income at statutory rates	$ 50,130	$ 45,344	$ 60,492
Add (deduct):
State taxes, net of federal benefit	7,168	6,765	4,139
Bank owned life insurance earnings	(1,127)	(747)	(1,141)
Adjustment to reserve for uncertain tax positions	84	80	59
Tax-exempt interest revenue	(1,827)	(1,229)	(1,199)
Equity compensation	(375)	(892)	(799)
Transaction costs	16	78	408
Tax credit investments	(464)	(29)	(89)
Change in state statutory tax rate	0	583	81
Increase in valuation allowance	0	0	413
Release of disproportionate tax effects related to de-designated cash flow hedges	0	0	3,400
Expense due to enactment of federal tax reform	0	0	38,198
Other	(614)	(138)	1,051
Total income tax expense	$ 52,991	$ 49,815	$ 105,013

Income Taxes - Deferred taxes (

Income Taxes - Deferred taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for loan losses	$ 14,910	$ 14,604
Net operating loss carryforwards	27,568	39,204
Deferred compensation	9,363	8,535
Loan purchase accounting adjustments	6,599	8,658
Reserve for losses on foreclosed properties	20	61
Nonqualified share based compensation	2,041	1,190
Accrued expenses	3,958	3,536
Investment in partnerships	67	426
Unamortized pension actuarial losses and prior service cost	1,739	1,606
Unrealized losses on securities available-for-sale	0	8,092
Unrealized losses on cash flow hedges	0	86
Lease liability	5,327	0
Other	2,038	1,235
Total deferred tax assets	73,630	87,233
Deferred tax liabilities:
Unrealized gains on securities available-for-sale	7,943	0
Acquired intangible assets	2,530	2,772
Premises and equipment	3,002	1,291
Loan origination costs	3,538	3,734
True tax leases	7,783	6,020
Prepaid expenses	373	398
Servicing assets	4,428	2,862
Derivatives	1,075	525
Right-of-use asset	4,809	0
Uncertain tax positions	1,792	2,036
Total deferred tax liabilities	37,273	19,638
Less valuation allowance	2,298	3,371
Net deferred tax asset	$ 34,059	$ 64,224

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of the beginning and ending unrecognized tax benefit
Balance at beginning of year	$ 3,264	$ 3,163	$ 3,892
Additions based on tax positions related to the current year	481	470	441
Decreases resulting from a lapse in the applicable statute of limitations	(375)	(369)	(351)
Remeasurement due to enactment of federal tax reform	0	0	(819)
Balance at end of year	$ 3,370	$ 3,264	$ 3,163

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Provisional income tax expense for impact of remeasurement of deferred tax asset			$ 38,200,000
Increase in deferred tax asset due to merger and acquisition	$ 203,000
Valuation allowance	2,298,000	$ 3,371,000
Net deferred tax asset	34,059,000	64,224,000
Tax benefit related to uncertain tax positions that increases income from continuing operations	2,920,000
Penalties and interest related to income taxes	0	0	$ 0
Accrued penalties and interest	0	$ 0
Begin to expire in 2021 | State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	10,500,000
Begin to expire in 2027 | Federal
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	74,600,000
Begin to expire in 2027 | State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	3,710,000
Begin to expire in 2031 | State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	197,000,000
Begin to expire in 2025 | State
Tax Credit Carryforward [Line Items]
State tax credits	$ 4,330,000

Pension and Employee Benefit _3

Pension and Employee Benefit Plans - Weighted-average assumptions to determine pension benefit obligation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Modified Retirement Plan | Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate for disclosures (percent)	3.25%	4.40%
Discount rate for net periodic benefit cost (percent)	4.40%	3.75%
Funded Plan | Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate for net periodic benefit cost (percent)		3.75%
Expected long-term rate of return (percent)		4.00%

Pension and Employee Benefit _4

Pension and Employee Benefit Plans - Changes in obligations and plan assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in plan assets, at fair value
Beginning plan assets	$ 12,595
Plan assets - end of year		$ 12,595
Modified Retirement Plan | Unfunded Plan
Accumulated benefit obligation:
Accumulated benefit obligation - beginning of year	21,736	21,705
Service cost	392	363	$ 551
Interest cost	931	801	778
Plan amendments	386	412
Actuarial (gains) losses	2,390	(949)
Benefits paid	(730)	(596)
Accumulated benefit obligation - end of year	25,105	21,736	21,705
Change in plan assets, at fair value
Beginning plan assets	0	0
Actual return	0	0
Employer contribution	730	596
Benefits paid	(730)	(596)
Plan assets - end of year	0	0	0
Funded status - end of year (plan assets less benefit obligations)	(25,105)	(21,736)
Funded Plan | Funded Plan
Accumulated benefit obligation:
Accumulated benefit obligation - beginning of year	16,011	17,700
Service cost	0	0	0
Interest cost	166	647	738
Plan amendments	0	0
Actuarial (gains) losses	1,489	(839)
Benefits paid	(17,666)	(1,497)
Accumulated benefit obligation - end of year	0	16,011	17,700
Change in plan assets, at fair value
Beginning plan assets	12,595	14,308
Actual return	173	(216)
Employer contribution	4,898	0
Benefits paid	(17,666)	(1,497)
Plan assets - end of year	0	12,595	$ 14,308
Funded status - end of year (plan assets less benefit obligations)	$ 0	$ (3,416)

Pension and Employee Benefit _5

Pension and Employee Benefit Plans - Components of net periodic benefit cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Modified Retirement Plan | Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 392	$ 363	$ 551
Interest cost	931	801	778
Expected return on plan assets	0	0	0
Amortization of prior service cost	635	666	560
Amortization of net losses	59	241	238
Net periodic benefit cost	2,017	2,071	2,127
Funded Plan | Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	166	647	738
Expected return on plan assets	(106)	(551)	(630)
Amortization of prior service cost	0	0	0
Amortization of net losses	0	0	0
Net periodic benefit cost	$ 60	$ 96	$ 108

Pension and Employee Benefit _6

Pension and Employee Benefit Plans - Estimated future benefit payments expected to be paid (Details) - Modified Retirement Plan - Unfunded Plan $ in Thousands	Dec. 31, 2019USD ($)
Defined Benefit Plan Disclosure [Line Items]
2020	$ 1,301
2021	1,176
2022	1,170
2023	1,164
2024	1,156
2025-2029	$ 7,133

Pension and Employee Benefit _7

Pension and Employee Benefit Plans - Fair value of Funded Plan assets by major category (Details) $ in Thousands	Dec. 31, 2018USD ($)
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 12,595
Money market fund
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	1,033
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	4,881
Corporate stocks
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	4,465
Exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	2,216
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	11,562
Level 1 | Money market fund
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0
Level 1 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	4,881
Level 1 | Corporate stocks
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	4,465
Level 1 | Exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	2,216
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	1,033
Level 2 | Money market fund
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	1,033
Level 2 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0
Level 2 | Corporate stocks
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0
Level 2 | Exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0
Level 3 | Money market fund
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0
Level 3 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0
Level 3 | Corporate stocks
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	0
Level 3 | Exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Total plan assets	$ 0

Pension and Employee Benefit _8

Pension and Employee Benefit Plans - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended			23 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 28, 2018
Defined Benefit Plan Disclosure [Line Items]
Employer match of employee contributions (percent)		100.00%			70.00%
Employer matching contribution maximum percent of employee's eligible compensation (percent)		5.00%			5.00%
Duration of service period to receive matching contribution		1 year
Vesting period of benefits		3 years
Compensation expense related to 401(k) Plan		$ 5,300,000	$ 4,730,000	$ 2,660,000
Unrecognized losses previously in accumulated other income (loss) recognized upon fund liquidation		1,558,000	0	0
Executive officers, certain key employees, and Board Of Directors
Defined Benefit Plan Disclosure [Line Items]
Matching contributions to deferred compensation plan		162,000	119,000	35,000
Discretionary contributions to deferred compensation plan		0	0	$ 0
Funded Plan | Defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
United contributions to the plan	$ 4,900,000
Unrecognized losses previously in accumulated other income (loss) recognized upon fund liquidation		1,560,000
Pension plan settlement expense		1,380,000
Total settlement loss upon plan termination		2,940,000
Modified Retirement Plan | Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
United contributions to the plan		730,000	596,000
Estimated net loss to be amortized in next fiscal year		326,000
Estimated prior service costs to be amortized in next fiscal year		531,000
Funded Plan | Funded Plan
Defined Benefit Plan Disclosure [Line Items]
United contributions to the plan		$ 4,898,000	$ 0
Discount rate for disclosures, retirees (percent)		3.60%
Discount rate for disclosures, nonretirees, years 1 through 5 (percent)		3.33%
Discount rate for disclosures, nonretirees, next 15 years (percent)		4.39%
Discount rate assessment, nonretirees, next 15 years, period		15 years
Discount rate for disclosures, nonretirees, beyond 20 years (percent)		4.72%
Maximum | Funded Plan | Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate assessment, nonretirees, years 1 through 5, period		5 years
Minimum | Funded Plan | Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate assessment, nonretirees, beyond 20 years period		20 years

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Derivatives designated as hedge instruments (Details) - Designated as hedging instruments - Fair value hedge - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative instrument hedges liabilities fair value	$ 880	$ 1,682
Derivative liabilities | Brokered CD's
Derivatives, Fair Value [Line Items]
Derivative instrument hedges liabilities fair value	$ 880	$ 1,682

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Derivatives not designated as hedging instruments (Details) - Not designated as hedging instruments - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, assets at fair value	$ 35,007	$ 24,705
Interest rate derivative instruments not designated as hedging instruments, liabilities at fair value	14,636	24,751
Derivative assets | Customer derivative positions
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, assets at fair value	27,277	5,216
Derivative assets | Dealer offsets to customer derivative positions
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, assets at fair value	394	7,620
Derivative assets | Mortgage banking - loan commitment
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, assets at fair value	1,970	1,190
Derivative assets | Mortgage banking - forward sales commitment
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, assets at fair value	98	28
Derivative assets | Bifurcated embedded derivatives
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, assets at fair value	5,268	10,651
Derivative liabilities | Customer derivative positions
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, liabilities at fair value	446	9,661
Derivative liabilities | Dealer offsets to customer derivative positions
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, liabilities at fair value	6,425	781
Derivative liabilities | Risk participations
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, liabilities at fair value	12	8
Derivative liabilities | Mortgage banking - forward sales commitment
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, liabilities at fair value	86	259
Derivative liabilities | Dealer offsets to bifurcated embedded derivatives
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, liabilities at fair value	7,667	13,339
Derivative liabilities | De-designated hedges
Derivatives, Fair Value [Line Items]
Interest rate derivative instruments not designated as hedging instruments, liabilities at fair value	$ 0	$ 703

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Effect of derivatives in fair value hedging relationships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments [Line Items]
Interest expense - deposits	$ 66,856	$ 39,543	$ 17,062
Interest revenue - taxable investment securities	69,920	73,496	70,172
Other noninterest income	28,775	24,142	16,477
Fair value hedge | Interest expense - deposits
Gains (losses) on fair value hedging relationships:
Amounts related to interest settlements on derivatives	(327)	(245)	160
Recognized on derivatives	733	(220)	(657)
Recognized on hedged items	(766)	(145)	371
Net income (expense) recognized on fair value hedges	$ (360)	(610)	(126)
Fair value hedge | Interest revenue - taxable investment securities
Gains (losses) on fair value hedging relationships:
Amounts related to interest settlements on derivatives		17	(302)
Recognized on derivatives		0	72
Recognized on hedged items		0	(265)
Net income (expense) recognized on fair value hedges		17	$ (495)
Fair value hedge | Other noninterest income
Gains (losses) on fair value hedging relationships:
Amounts related to interest settlements on derivatives		0
Recognized on derivatives		356
Recognized on hedged items		(447)
Net income (expense) recognized on fair value hedges		$ (91)

Derivatives and Hedging Activ_6

Derivatives and Hedging Activities - Carrying amount and hedge accounting basis adjustment (Details) - Fair value hedge - Interest rate swaps - Deposits - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Carrying amount of Assets (Liabilities)	$ (35,880)	$ (35,776)
Hedge Accounting Basis Adjustment	$ 645	$ 1,838

Derivatives and Hedging Activ_7

Derivatives and Hedging Activities - Gains and losses recognized on derivatives not designated as hedging instruments (Details) - Not designated as hedging instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments [Line Items]
Total gains and losses	$ 1,097	$ 4,413	$ 2,364
Customer derivatives and dealer offsets | Other noninterest income
Derivative Instruments [Line Items]
Total gains and losses	2,878	2,658	2,416
Bifurcated embedded derivatives and dealer offsets | Other noninterest income
Derivative Instruments [Line Items]
Total gains and losses	212	307	429
Interest rate caps | Other noninterest income
Derivative Instruments [Line Items]
Total gains and losses	0	501	252
De-designated hedges | Other noninterest income
Derivative Instruments [Line Items]
Total gains and losses	(193)	31	(62)
Mortgage banking derivatives | Mortgage loan revenue
Derivative Instruments [Line Items]
Total gains and losses	(1,797)	904	(676)
Risk participations | Other noninterest income
Derivative Instruments [Line Items]
Total gains and losses	$ (3)	$ 12	$ 5

Derivatives and Hedging Activ_8

Derivatives and Hedging Activities - Narrative (Details) $ in Millions	Dec. 31, 2019USD ($)contract	Dec. 31, 2018USD ($)contract
Derivative Instruments [Line Items]
Collateral pledged toward derivatives | $	$ 14.9
Fair value hedge | Interest rate swaps
Derivative Instruments [Line Items]
Number of derivative contracts held | contract	4	4
Aggregate notional amount | $	$ 37.9	$ 39
Not designated as hedging instrument, economic hedge | Interest rate swaps
Derivative Instruments [Line Items]
Number of derivative contracts held | contract	3

Regulatory Matters - Regulatory

Regulatory Matters - Regulatory capital ratios and minimum amounts required (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Risk-based ratios:
Common equity tier 1 capital, Minimum	4.50%
Common equity tier 1 capital, Well Capitalized	6.50%
Common equity tier 1 capital	12.97%	12.16%
Tier 1 capital, Minimum	6.00%
Tier 1 capital, Well Capitalized	8.00%
Tier 1 capital	13.21%	12.42%
Total capital, Minimum	8.00%
Total capital, Well Capitalized	10.00%
Total capital	15.01%	14.29%
Tier 1 Leverage ratio, Minimum	4.00%
Tier 1 Leverage ratio, Well Capitalized	5.00%
Tier 1 Leverage ratio	10.34%	9.61%
Common equity tier 1 capital	$ 1,275,148	$ 1,148,355
Tier 1 capital	1,299,398	1,172,605
Total capital	1,476,302	1,348,843
Risk-weighted assets	9,834,051	9,441,622
Average total assets	$ 12,568,563	$ 12,207,986
United Community Bank
Risk-based ratios:
Common equity tier 1 capital	14.87%	12.91%
Tier 1 capital	14.87%	12.91%
Total capital	15.54%	13.60%
Tier 1 Leverage ratio	11.63%	9.98%
Common equity tier 1 capital	$ 1,458,720	$ 1,216,449
Tier 1 capital	1,458,720	1,216,449
Total capital	1,524,267	1,281,062
Risk-weighted assets	9,810,477	9,421,009
Average total assets	$ 12,545,254	$ 12,183,341

Regulatory Matters - Narrative

Regulatory Matters - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Dividends paid by Bank to the Holding Company	$ 0	$ 162,000,000
Maximum percentage of credit to affiliate under federal reserve act	10.00%
Maximum percentage of credit to all affiliates under federal reserve act	20.00%

Commitments and Contingencies -

Commitments and Contingencies - Contractual amount of off-balance sheet instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments	$ 2,126,275	$ 2,129,463
Letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments	$ 22,533	$ 25,447

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) $ in Thousands	Dec. 31, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
Investment in limited partnerships	$ 34,800
Commitment for additional fund	$ 5,720

Common and Preferred Stock - Na

Common and Preferred Stock - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2019
Equity [Abstract]
Stock repurchase plan authorization			$ 50,000,000
Number of shares repurchased under the program	500,495	0
Repurchase program remaining authorization	$ 50,000,000
Preferred stock authorized (in shares)	10,000,000
Preferred stock outstanding (in shares)	0	0

Equity Compensation and Relat_3

Equity Compensation and Related Plans - Restricted stock units and options outstanding activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock Option, Shares
Exercised options (in shares)	(13,000)	(12,000)
Restricted Stock Units
Restricted Stock Units, Shares
Beginning balance, outstanding (in shares)	759,746	663,817	690,970
Granted (in shares)	315,827	416,484	270,339
Vested (in shares)	(216,138)	(290,013)	(284,662)
Expired (in shares)	0		0
Cancelled (in shares)	(51,011)	(30,542)	(12,830)
Ending balance, outstanding (in shares)	808,424	759,746	663,817
Vested / Exercisable (in shares)	0
Restricted Stock Units, Weighted Average Grant Date Fair Value
Beginning balance, outstanding (in dollars per share)	$ 27.66	$ 22.40	$ 18.60
Granted (in dollars per share)	26.74	30.54	26.50
Vested (in dollars per share)	25.38	20.18	17.48
Expired (in dollars per share)			0
Cancelled (in dollars per share)	27.18	23.65	19.91
Ending balance, outstanding (in dollars per share)	27.94	$ 27.66	$ 22.40
Vested / Exercisable (in dollars per share)	$ 0
Vested, Aggregate Intrinsic Value	$ 6,004
Outstanding, Aggregate Intrinsic Value	$ 24,964
Stock Options
Stock Option, Shares
Beginning balance, options outstanding (in shares)	47,139	60,287	72,665
Granted options (in shares)	0	0	0
Vested options (in shares)			0
Exercised options (in shares)	(13,000)	(12,000)
Expired options (in shares)	(30,243)		(1,538)
Cancelled options (in shares)	(2,396)	(1,148)	(10,840)
Ending balance, options outstanding (in shares)	1,500	47,139	60,287
Vested / Exercisable, options (in shares)	1,500
Stock Option, Weighted Average Exercise Price
Beginning balance, options outstanding (in dollars per share)	$ 27.07	$ 24.12	$ 34.34
Granted options (in dollars per share)	0	0	0
Vested options (in dollars per share)			0
Exercised options (in dollars per shares)	16.34	11.85
Expired options (in dollars per share)	31.43		147.60
Cancelled options (in dollars per share)	29.68	31.50	75.08
Ending balance, options outstanding (in dollars per share)	27.95	$ 27.07	$ 24.12
Vested / Exercisable, options (in dollars per share)	$ 27.95
Outstanding, Weighted Average Remaining Term (Yrs.)	3 months 7 days
Exercisable, Weighted Average Remaining Term (Yrs.)	3 months 7 days
Outstanding, Aggregate Intrinsic Value	$ 4
Exercisable, Aggregate Intrinsic Value	$ 4

Equity Compensation and Relat_4

Equity Compensation and Related Plans - Summary of stock options (Details)	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Range 20.00 - 25.00
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Shares | shares	500
Options Outstanding, Range Minimum	$ 20
Options Outstanding, Range Maximum	25
Options Outstanding, Weighted Average Price	$ 22.95
Options Outstanding, Average Remaining Life	2 months 19 days
Options Exercisable, Shares | shares	500
Options Exercisable, Weighted Average Price	$ 22.95
Range 30.01 - 30.45
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Shares | shares	1,000
Options Outstanding, Range Minimum	$ 30.01
Options Outstanding, Range Maximum	30.45
Options Outstanding, Weighted Average Price	$ 30.45
Options Outstanding, Average Remaining Life	3 months 14 days
Options Exercisable, Shares | shares	1,000
Options Exercisable, Weighted Average Price	$ 30.45
Range 20.00 - 30.45
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options Outstanding, Shares | shares	1,500
Options Outstanding, Range Minimum	$ 20
Options Outstanding, Range Maximum	30.45
Options Outstanding, Weighted Average Price	$ 27.95
Options Outstanding, Average Remaining Life	3 months 7 days
Options Exercisable, Shares | shares	1,500
Options Exercisable, Weighted Average Price	$ 27.95

Equity Compensation and Relat_5

Equity Compensation and Related Plans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period under plan	4 years
Maximum exercisable period	10 years
Additional awards granted under plan	1,320,000
Deferred income tax benefit related to compensation expense for awards	$ 2,390,000	$ 1,540,000	$ 2,270,000
Unrecognized compensation cost	$ 14,800,000
Weighted-average recognition period for unrecognized compensation costs	2 years 6 months
Shares issued in connection with DRIP (in shares)	62,629	7,307	4,404
Discount offered to employees under United has an Employee Stock Purchase Program (ESPP) to purchase shares of common stock	10.00%
Stock issued through Employee Stock Purchase Program (in shares)	20,928	17,941	13,422
Common stock issuable shares under deferred compensation plan (in shares)	664,640	674,499
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 0	$ 18,000	$ 28,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 8,980,000	$ 5,690,000	$ 5,510,000
Units outstanding (in shares)	808,424	759,746	663,817	690,970
Restricted stock units | Merger-related and other charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 740,000
Accelerated compensation cost	1,380,000		$ 696,000
Restricted stock units | Salaries and employee benefits expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	6,860,000		4,820,000
Restricted stock units | Other operating expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 379,000	$ 338,000	$ 287,000
Performance-based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units outstanding (in shares)	96,910

Fair Value Measurements - Asset

Fair Value Measurements - Assets and liabilities measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Debt securities available-for-sale	$ 2,274,581	$ 2,628,467
Mortgage loans held for sale	58,500	18,900
Derivative financial instruments	35,007	24,705
Liabilities, Fair Value Disclosure [Abstract]
Derivative financial instruments	15,516	26,433
U.S. Treasuries
Assets:
Debt securities available-for-sale	154,618	149,307
U.S. Government agencies
Assets:
Debt securities available-for-sale	3,035	25,553
State and political subdivisions
Assets:
Debt securities available-for-sale	226,490	233,941
Residential mortgage-backed securities
Assets:
Debt securities available-for-sale	1,299,025
Commercial mortgage-backed securities
Assets:
Debt securities available-for-sale	284,953
Corporate bonds
Assets:
Debt securities available-for-sale	203,091	199,163
Asset-backed securities
Assets:
Debt securities available-for-sale	103,369	182,676
Recurring
Assets:
Mortgage loans held for sale	58,484	18,935
Deferred compensation plan assets	8,133	6,404
Servicing rights for SBA/USDA loans	6,794	7,510
Residential mortgage servicing rights	13,565	11,877
Derivative financial instruments	35,007	24,705
Total assets	2,398,537	2,698,974
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liability	8,132	6,404
Derivative financial instruments	15,516	26,433
Total liabilities	23,648	32,837
Recurring | U.S. Treasuries
Assets:
Debt securities available-for-sale	154,618	149,307
Recurring | U.S. Government agencies
Assets:
Debt securities available-for-sale	3,035	25,553
Recurring | State and political subdivisions
Assets:
Debt securities available-for-sale	226,490	233,941
Recurring | Residential mortgage-backed securities
Assets:
Debt securities available-for-sale	1,299,025	1,445,910
Recurring | Commercial mortgage-backed securities
Assets:
Debt securities available-for-sale	284,953	391,917
Recurring | Corporate bonds
Assets:
Debt securities available-for-sale	203,091	199,163
Recurring | Asset-backed securities
Assets:
Debt securities available-for-sale	103,369	182,676
Recurring | Equity securities with readily determinable fair values
Assets:
Debt securities available-for-sale	1,973	1,076
Recurring | Level 1
Assets:
Mortgage loans held for sale	0	0
Deferred compensation plan assets	8,133	6,404
Servicing rights for SBA/USDA loans	0	0
Residential mortgage servicing rights	0	0
Derivative financial instruments	0	0
Total assets	164,724	156,787
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liability	8,132	6,404
Derivative financial instruments	0	0
Total liabilities	8,132	6,404
Recurring | Level 1 | U.S. Treasuries
Assets:
Debt securities available-for-sale	154,618	149,307
Recurring | Level 1 | U.S. Government agencies
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 1 | State and political subdivisions
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 1 | Residential mortgage-backed securities
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 1 | Commercial mortgage-backed securities
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 1 | Corporate bonds
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 1 | Asset-backed securities
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 1 | Equity securities with readily determinable fair values
Assets:
Debt securities available-for-sale	1,973	1,076
Recurring | Level 2
Assets:
Mortgage loans held for sale	58,484	18,935
Deferred compensation plan assets	0	0
Servicing rights for SBA/USDA loans	0	0
Residential mortgage servicing rights	0	0
Derivative financial instruments	27,769	12,864
Total assets	2,205,218	2,509,964
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liability	0	0
Derivative financial instruments	6,957	10,701
Total liabilities	6,957	10,701
Recurring | Level 2 | U.S. Treasuries
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 2 | U.S. Government agencies
Assets:
Debt securities available-for-sale	3,035	25,553
Recurring | Level 2 | State and political subdivisions
Assets:
Debt securities available-for-sale	226,490	233,941
Recurring | Level 2 | Residential mortgage-backed securities
Assets:
Debt securities available-for-sale	1,299,025	1,445,910
Recurring | Level 2 | Commercial mortgage-backed securities
Assets:
Debt securities available-for-sale	284,953	391,917
Recurring | Level 2 | Corporate bonds
Assets:
Debt securities available-for-sale	202,093	198,168
Recurring | Level 2 | Asset-backed securities
Assets:
Debt securities available-for-sale	103,369	182,676
Recurring | Level 2 | Equity securities with readily determinable fair values
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 3
Assets:
Mortgage loans held for sale	0	0
Deferred compensation plan assets	0	0
Servicing rights for SBA/USDA loans	6,794	7,510
Residential mortgage servicing rights	13,565	11,877
Derivative financial instruments	7,238	11,841
Total assets	28,595	32,223
Liabilities, Fair Value Disclosure [Abstract]
Deferred compensation plan liability	0	0
Derivative financial instruments	8,559	15,732
Total liabilities	8,559	15,732
Recurring | Level 3 | U.S. Treasuries
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 3 | U.S. Government agencies
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 3 | State and political subdivisions
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 3 | Residential mortgage-backed securities
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 3 | Commercial mortgage-backed securities
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 3 | Corporate bonds
Assets:
Debt securities available-for-sale	998	995
Recurring | Level 3 | Asset-backed securities
Assets:
Debt securities available-for-sale	0	0
Recurring | Level 3 | Equity securities with readily determinable fair values
Assets:
Debt securities available-for-sale	$ 0	$ 0

Fair Value Measurements - Recon

Fair Value Measurements - Reconciliation for measurements at fair value on a recurring basis using significant unobservable inputs (Details) - Recurring - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Asset
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	$ 11,841	$ 12,207	$ 11,777
Sales and settlements	(1,135)	(1,029)	(1,744)
Other comprehensive income	0	0	0
Amounts included in earnings - fair value adjustments	(3,468)	663	2,174
Balance at end of period	7,238	11,841	12,207
Debt Securities Available- for-Sale
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	995	900	675
Sales and settlements	0	0	0
Other comprehensive income	3	95	225
Amounts included in earnings - fair value adjustments	0	0	0
Balance at end of period	998	995	900
Derivative Liability
Reconciliation of Liabilities at Level 3 Measurement
Balance at beginning of period	15,732	16,744	16,347
Sales and settlements	(2,330)	(1,347)	(2,423)
Other comprehensive income	0	0	0
Amounts included in earnings - fair value adjustments	(4,843)	335	2,820
Balance at end of period	$ 8,559	$ 15,732	$ 16,744

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative information about Level 3 measurements for fair value on a recurring basis (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities available-for-sale	$ 2,274,581	$ 2,628,467
Derivative assets	35,007	24,705
Derivative liabilities	15,516	26,433
Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	35,007	24,705
Derivative liabilities	15,516	26,433
Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	7,238	11,841
Derivative liabilities	8,559	15,732
Recurring | Level 3 | Corporate bonds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Debt securities available-for-sale	$ 998	995
Valuation technique	Indicative bid provided by a broker
Recurring | Level 3 | Derivative assets - mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 1,970	$ 1,190
Valuation technique	Internal model
Recurring | Level 3 | Derivative assets - mortgage | Pull Through Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets, measurement input	0.836	0.807
Recurring | Level 3 | Derivative assets - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 5,268	$ 10,651
Valuation technique	Dealer priced
Recurring | Level 3 | Derivative liabilities - risk participations
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liabilities	$ 12	$ 8
Valuation technique	Internal model
Recurring | Level 3 | Derivative liabilities - risk participations | Probable Exposure Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liabilities, measurement input	0.0036	0.0044
Recurring | Level 3 | Derivative liabilities - risk participations | Probability of Default Rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liabilities, measurement input	0.0180	0.0180
Recurring | Level 3 | Derivative liabilities - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative liabilities	$ 8,547	$ 15,724
Valuation technique	Dealer priced

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets and liabilities measured at fair value on nonrecurring basis (Details) - Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 20,977	$ 8,631
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 20,977	$ 8,631

Fair Value Measurements - Fair

Fair Value Measurements - Fair values for other financial instruments that are not measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Debt securities held-to-maturity, fair value	$ 287,904	$ 268,803
Carrying Amount
Assets:
Debt securities held-to-maturity, fair value	283,533	274,407
Loans, net	8,750,464	8,322,198
Liabilities:
Deposits	10,897,244	10,534,513
Federal Home Loan Bank advances		160,000
Long-term debt	212,664	267,189
Fair Value
Assets:
Debt securities held-to-maturity, fair value	287,904	268,803
Loans, net	8,714,592	8,277,387
Liabilities:
Deposits	10,897,465	10,528,834
Federal Home Loan Bank advances		159,988
Long-term debt	217,665	278,996
Fair Value | Level 1
Assets:
Debt securities held-to-maturity, fair value	0	0
Loans, net	0	0
Liabilities:
Deposits	0	0
Federal Home Loan Bank advances		0
Long-term debt	0	0
Fair Value | Level 2
Assets:
Debt securities held-to-maturity, fair value	287,904	268,803
Loans, net	0	0
Liabilities:
Deposits	10,897,465	10,528,834
Federal Home Loan Bank advances		159,988
Long-term debt	0	0
Fair Value | Level 3
Assets:
Debt securities held-to-maturity, fair value	0	0
Loans, net	8,714,592	8,277,387
Liabilities:
Deposits	0	0
Federal Home Loan Bank advances		0
Long-term debt	$ 217,665	$ 278,996

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Mortgage loans held for sale	$ 58,500	$ 18,900
Mortgage loans held for sale, outstanding principal balance	56,600	18,200
Net gains (losses) from changes in fair value of loans	$ 1,180	$ (133)	$ 505
Percentage of written down in appraisal value of nonaccrual impaired loans	80.00%
Maximum remaining maturity of financial instruments having no defined maturity	180 days

Condensed Financial Statement_3

Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) - Statements of Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Operations
Dividends from bank	$ 0	$ 162,000,000
Total income	560,957,000	522,211,000	$ 440,445,000
Interest expense	83,312,000	61,330,000	33,735,000
Other expense	15,092,000	17,194,000	12,962,000
Total expenses	322,245,000	306,285,000	267,611,000
Income tax benefit (expense)	(52,991,000)	(49,815,000)	(105,013,000)
Net income	185,721,000	166,111,000	67,821,000
Holding Company
Statement of Operations
Dividends from bank	0	161,500,000	103,200,000
Dividends from other subsidiaries	4,651,000	850,000	0
Shared service fees from subsidiaries	14,721,000	10,257,000	10,481,000
Other	1,468,000	133,000	1,078,000
Total income	20,840,000	172,740,000	114,759,000
Interest expense	11,573,000	11,868,000	10,258,000
Other expense	18,965,000	14,456,000	14,960,000
Total expenses	30,538,000	26,324,000	25,218,000
Income tax benefit (expense)	8,711,000	1,640,000	1,447,000
Income before equity in undistributed (loss) earnings of subsidiaries	(987,000)	148,056,000	90,988,000
Equity in undistributed (loss) earnings of subsidiaries	186,708,000	18,055,000	(23,167,000)
Net income	$ 185,721,000	$ 166,111,000	$ 67,821,000

Condensed Financial Statement_4

Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash	$ 515,206	$ 327,265
Other assets	171,135	154,750
Total assets	12,916,016	12,573,192
LIABILITIES AND SHAREHOLDERS’ EQUITY
Long-term debt	212,664	267,189
Total liabilities	11,280,324	11,115,638
Shareholders' equity	1,635,692	1,457,554	$ 1,303,334	$ 1,075,735
Total liabilities and shareholders’ equity	12,916,016	12,573,192
Holding Company
ASSETS
Cash	32,495	145,669
Investment in bank	1,814,414	1,522,402
Investment in other subsidiaries	752	4,549
Other assets	29,308	21,881
Total assets	1,876,969	1,694,501
LIABILITIES AND SHAREHOLDERS’ EQUITY
Long-term debt	212,664	212,193
Other liabilities	28,613	24,754
Total liabilities	241,277	236,947
Shareholders' equity	1,635,692	1,457,554
Total liabilities and shareholders’ equity	$ 1,876,969	$ 1,694,501

Condensed Financial Statement_5

Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net income	$ 185,721	$ 166,111	$ 67,821
Adjustments to reconcile net income to net cash provided by operating activities:
Stock based compensation	9,360	6,057	5,827
Changes in assets and liabilities:
(Increase) decrease in other assets and accrued interest receivable	(45,789)	13,195	(15,525)
Net cash provided by operating activities	153,933	270,006	207,962
Investing activities:
Purchases of premises and equipment	(20,944)	(17,617)	(22,183)
Net cash used in investing activities	163,218	(359,475)	(45,506)
Financing activities:
Cash paid for shares withheld to cover payroll taxes upon vesting of restricted stock units	(1,686)	(1,998)	(1,701)
Proceeds from issuance of common stock for dividend reinvestment and employee benefit plans	2,193	679	450
Proceeds from exercise of stock options	212	142	0
Repurchase of common stock	(13,020)	0	0
Cash dividends on common stock	(53,044)	(41,634)	(26,210)
Net cash (used in) provided by financing activities	(129,210)	102,459	(65,529)
Net change in cash and cash equivalents, including restricted cash	187,941	12,990	96,927
Cash and cash equivalents, including restricted cash, at beginning of year	327,265	314,275	217,348
Cash and cash equivalents, including restricted cash, at end of year	515,206	327,265	314,275
Holding Company
Operating activities:
Net income	185,721	166,111	67,821
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings (loss) of the subsidiaries	(186,708)	(18,055)	23,167
Stock based compensation	9,360	6,057	5,827
Changes in assets and liabilities:
(Increase) decrease in other assets and accrued interest receivable	(3,022)	1,777	1,220
Other liabilities	2,080	3,124	(758)
Net cash provided by operating activities	7,431	159,014	97,277
Investing activities:
Payment for acquisition	(52,093)	(84,499)	(11,034)
Purchases of premises and equipment	0	(364)	(708)
Purchase of available for sale securities	(3,000)	(2,489)	0
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	83	0	0
Net cash used in investing activities	(55,010)	(87,352)	(11,742)
Financing activities:
Repayment of long-term debt	(250)	(7,424)	(75,000)
Proceeds from issuance of long-term debt	0	98,188	0
Cash paid for shares withheld to cover payroll taxes upon vesting of restricted stock units	(1,686)	(1,998)	(1,701)
Proceeds from issuance of common stock for dividend reinvestment and employee benefit plans	2,193	679	450
Proceeds from exercise of stock options	212	142	0
Repurchase of common stock	(13,020)	0	0
Cash dividends on common stock	(53,044)	(41,634)	(26,210)
Net cash (used in) provided by financing activities	(65,595)	47,953	(102,461)
Net change in cash and cash equivalents, including restricted cash	(113,174)	119,615	(16,926)
Cash and cash equivalents, including restricted cash, at beginning of year	145,669	26,054	42,980
Cash and cash equivalents, including restricted cash, at end of year	$ 32,495	$ 145,669	$ 26,054

Subsequent Events - Narrative (

Subsequent Events - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 05, 2020	Feb. 26, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Common stock dividends (in dollars per share)			$ 0.68	$ 0.58	$ 0.38
Repurchase of common stock			$ 13,020	$ 0	$ 0
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends (in dollars per share)	$ 0.18
Dividends, date declared	Feb. 5, 2020
Dividends, date of record	Mar. 16, 2020
Dividends, date payable	Apr. 6, 2020
Shares repurchased (in shares)		331,482
Repurchase of common stock		$ 9,400

Uncategorized Items - ucbi12312

Label	Element	Value
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (549,000)
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 437,000