Trustmark (TRMK) 10-Q 4 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 31, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	TRUSTMARK CORP
Entity Central Index Key	36,146
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		67,627,272
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Trading Symbol	TRMK

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets
Cash and due from banks (noninterest-bearing)	$ 383,945	$ 277,751
Federal funds sold and securities purchased under reverse repurchase agreements	500	250
Securities available for sale (at fair value)	2,410,947	2,345,422
Securities held to maturity (fair value: $1,173,101-2016; $1,195,367-2015)	1,143,234	1,187,818
Loans held for sale (LHFS)	242,097	160,189
Loans held for investment (LHFI)	7,499,204	7,091,385
Less allowance for loan losses, LHFI	70,871	67,619
Net LHFI	7,428,333	7,023,766
Acquired loans:
Noncovered loans	291,825	372,711
Covered loans	3,912	17,700
Less allowance for loan losses, acquired loans	11,380	11,992
Net acquired loans	284,357	378,419
Net LHFI and acquired loans	7,712,690	7,402,185
Premises and equipment, net	190,930	195,656
Mortgage servicing rights	65,514	74,007
Goodwill	366,156	366,156
Identifiable intangible assets	22,366	27,546
Other real estate, excluding covered other real estate	64,993	77,177
Covered other real estate	0	1,651
FDIC indemnification asset	0	738
Other assets	558,166	562,350
Total Assets	13,161,538	12,678,896
Deposits:
Noninterest-bearing	3,111,603	2,998,694
Interest-bearing	6,574,098	6,589,536
Total deposits	9,685,701	9,588,230
Federal funds purchased and securities sold under repurchase agreements	514,918	441,042
Short-term borrowings	412,792	412,617
Long-term FHLB advances	751,075	501,155
Subordinated notes	49,993	49,969
Junior subordinated debt securities	61,856	61,856
Other liabilities	150,442	150,970
Total Liabilities	11,626,777	11,205,839
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 67,626,939 shares - 2016; 67,559,128 shares - 2015	14,090	14,076
Capital surplus	365,553	361,467
Retained earnings	1,172,193	1,142,908
Accumulated other comprehensive loss, net of tax	(17,075)	(45,394)
Total Shareholders' Equity	1,534,761	1,473,057
Total Liabilities and Shareholders' Equity	$ 13,161,538	$ 12,678,896

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets
Securities held to maturity, fair value	$ 1,173,101	$ 1,195,367
Shareholders' Equity
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	250,000,000	250,000,000
Common stock, issued (in shares)	67,626,939	67,559,128
Common stock, outstanding (in shares)	67,626,939	67,559,128

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest Income
Interest and fees on LHFS & LHFI	$ 76,524	$ 69,458	$ 222,555	$ 203,836
Interest and fees on acquired loans	6,781	11,607	21,854	39,242
Interest on securities:
Taxable	19,351	20,264	58,839	59,581
Tax exempt	902	1,046	2,804	3,306
Interest on federal funds sold and securities purchased under reverse repurchase agreements	5	2	10	4
Other interest income	223	392	653	1,177
Total Interest Income	103,786	102,769	306,715	307,146
Interest Expense
Interest on deposits	3,208	3,147	9,368	9,598
Interest on federal funds purchased and securities sold under repurchase agreements	411	205	1,246	527
Other interest expense	2,603	1,811	7,420	5,074
Total Interest Expense	6,222	5,163	18,034	15,199
Net Interest Income	97,564	97,606	288,681	291,947
Provision for loan losses, LHFI	4,284	2,514	9,123	5,332
Provision for loan losses, acquired loans	691	1,256	2,607	2,428
Net Interest Income After Provision for Loan Losses	92,589	93,836	276,951	284,187
Noninterest Income
Service charges on deposit accounts	11,677	12,400	33,809	35,405
Bank card and other fees	6,756	6,964	21,110	21,142
Mortgage banking, net	7,364	7,443	22,784	25,889
Insurance commissions	10,074	9,906	28,305	27,923
Wealth management	7,571	7,790	22,987	23,538
Other, net	1,274	1,470	3,534	(18)
Security losses, net			(310)	0
Total Noninterest Income	44,716	45,973	132,219	133,879
Noninterest Expense
Salaries and employee benefits	57,250	58,270	181,469	172,832
Services and fees	14,947	14,691	43,944	43,817
Net occupancy - premises	6,440	6,580	18,556	19,014
Equipment expense	6,063	5,877	18,053	17,754
Other real estate expense	(1,313)	3,385	61	5,421
FDIC assessment expense	2,911	2,559	8,681	8,114
Other expense	11,610	12,198	36,267	36,090
Total Noninterest Expense	97,908	103,560	307,031	303,042
Income Before Income Taxes	39,397	36,249	102,139	115,024
Income taxes	8,415	7,819	22,651	26,844
Net Income	$ 30,982	$ 28,430	$ 79,488	$ 88,180
Earnings Per Share
Basic	$ 0.46	$ 0.42	$ 1.18	$ 1.31
Diluted	0.46	0.42	1.17	1.30
Dividends Per Share	$ 0.23	$ 0.23	$ 0.69	$ 0.69

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income per consolidated statements of income	$ 30,982	$ 28,430	$ 79,488	$ 88,180
Unrealized (losses) gains on available for sale securities and transferred securities:
Unrealized holding (losses) gains arising during the period	(7,816)	11,035	19,796	8,470
Less: adjustment for net losses realized in net income	0	0	191	0
Change in net unrealized holding loss on securities transferred to held to maturity	1,653	1,036	5,171	2,931
Pension and other postretirement benefit plans:
Net change in prior service costs	39	39	116	116
Recognized net loss due to lump sum settlement	286	373	1,935	926
Change in net actuarial loss	573	751	1,658	2,256
Derivatives:
Change in the accumulated loss on effective cash flow hedge derivatives	257	(751)	(840)	(1,185)
Less: adjustment for loss realized in net income	97	130	292	390
Other comprehensive (loss) income, net of tax	(4,911)	12,613	28,319	13,904
Comprehensive income	$ 26,071	$ 41,043	$ 107,807	$ 102,084

Consolidated Condensed Statemen

Consolidated Condensed Statements of Changes in Shareholders' Equity (Unaudited) $ in Thousands	USD ($)
Balance at Dec. 31, 2014	$ 1,419,940
Statement Of Stockholders Equity [Abstract]
Net income per consolidated statements of income	88,180
Other comprehensive income, net of tax	13,904
Common stock dividends paid	(46,952)
Common stock issued-net, long-term incentive plan	(842)
Excess tax expense from stock-based compensation arrangements	(212)
Compensation expense, long-term incentive plan	2,738
Balance at Sep. 30, 2015	1,476,756
Balance at Dec. 31, 2015	1,473,057
Statement Of Stockholders Equity [Abstract]
Net income per consolidated statements of income	79,488
Other comprehensive income, net of tax	28,319
Common stock dividends paid	(46,983)
Common stock issued-net, long-term incentive plan	(992)
Repurchase and retirement of common stock	(750)
Excess tax expense from stock-based compensation arrangements	(119)
Compensation expense, long-term incentive plan	2,741
Balance at Sep. 30, 2016	$ 1,534,761

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities
Net income per consolidated statements of income	$ 79,488	$ 88,180
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses, net	11,730	7,760
Depreciation and amortization	27,183	27,995
Net amortization of securities	6,833	6,411
Securities losses, net	310	0
Gains on sales of loans, net	(14,477)	(13,301)
Deferred income tax provision	12,900	11,600
Proceeds from sales of loans held for sale	1,030,784	943,804
Purchases and originations of loans held for sale	(1,096,979)	(985,935)
Originations of mortgage servicing rights	(12,392)	(13,321)
Increase in bank-owned life insurance	(3,653)	(3,598)
Net (increase) decrease in other assets	(20,833)	18,480
Net increase (decrease) in other liabilities	5,405	(1,151)
Other operating activities, net	14,617	6,325
Net cash provided by operating activities	40,916	93,249
Investing Activities
Proceeds from calls and maturities of securities held to maturity	221,002	95,467
Proceeds from calls and maturities of securities available for sale	344,160	345,156
Proceeds from sales of securities available for sale	24,693	0
Purchases of securities held to maturity	(168,665)	(68,715)
Purchases of securities available for sale	(408,532)	(375,866)
Net proceeds from bank-owned life insurance	604	655
Net (increase) decrease in federal funds sold and securities purchased under reverse repurchase agreements	(250)	1,885
Net increase in member bank stock	(2,153)	(12,585)
Net increase in loans	(343,707)	(247,772)
Purchases of premises and equipment	(6,929)	(9,934)
Proceeds from sales of premises and equipment	435	2,896
Proceeds from sales of other real estate	37,378	33,809
Purchases of software	(5,072)	(6,576)
Investments in tax credit and other partnerships	(46)	(315)
Purchase of insurance book of business	0	(2,787)
Net cash used in investing activities	(307,082)	(244,682)
Financing Activities
Net increase (decrease) in deposits	97,471	(285,954)
Net increase in federal funds purchased and securities sold under repurchase agreements	73,876	90,661
Net (decrease) increase in short-term borrowings	(1,057)	298,888
Payments on long-term FHLB advances	(78)	(77)
Proceeds from long-term FHLB advances	250,000	0
Common stock dividends	(46,983)	(46,952)
Common stock issued-net, long-term incentive plan	0	(842)
Repurchase and retirement of common stock	(750)	0
Excess tax expense from stock-based compensation arrangements	(119)	(212)
Net cash provided by financing activities	372,360	55,512
Increase (Decrease) in cash and cash equivalents	106,194	(95,921)
Cash and cash equivalents at beginning of period	277,751	315,973
Cash and cash equivalents at end of period	$ 383,945	$ 220,052

Business, Basis of Financial St

Business, Basis of Financial Statement Presentation and Principles of Consolidation	9 Months Ended
	Sep. 30, 2016
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business, Basis of Financial Statement Presentation and Principles of Consolidation	Note 1 – Business, Basis of Financial Statement Presentation and Principles of Consolidation Trustmark Corporation (Trustmark) is a bank holding company headquartered in Jackson, Mississippi. Through its subsidiaries, Trustmark operates as a financial services organization providing banking and financial solutions to corporate institutions and individual customers through 194 offices in Alabama, Florida, Mississippi, Tennessee and Texas. The consolidated financial statements include the accounts of Trustmark and all other entities in which Trustmark has a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements, and notes thereto, included in Trustmark’s 2015 Annual Report on Form 10-K. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. In the opinion of Management, all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of these consolidated financial statements have been included. The preparation of financial statements in conformity with these accounting principles requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and income and expense during the reporting periods and the related disclosures. Although Management’s estimates contemplate current conditions and how they are expected to change in the future, it is reasonably possible that in 2016 actual conditions could vary from those anticipated, which could affect Trustmark’s financial condition and results of operations. Actual results could differ from those estimates.

Securities Available for Sale a

Securities Available for Sale and Held to Maturity	9 Months Ended
	Sep. 30, 2016
Investments Debt And Equity Securities [Abstract]
Securities Available for Sale and Held to Maturity	Note 2 – Securities Available for Sale and Held to Maturity The following tables are a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at September 30, 2016 and December 31, 2015 ($ in thousands): Securities Available for Sale Securities Held to Maturity September 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value U.S. Government agency obligations Issued by U.S. Government agencies $ 58,259 $ 482 $ (507 ) $ 58,234 $ — $ — $ — $ — Issued by U.S. Government sponsored agencies 257 26 — 283 3,636 337 — 3,973 Obligations of states and political subdivisions 121,485 3,167 (11 ) 124,641 52,937 2,615 (4 ) 55,548 Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 36,130 712 (54 ) 36,788 16,183 666 — 16,849 Issued by FNMA and FHLMC 554,916 7,239 (166 ) 561,989 39,989 810 — 40,799 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 1,353,984 21,507 (1,092 ) 1,374,399 831,662 18,690 (60 ) 850,292 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 247,689 6,945 (21 ) 254,613 198,827 6,921 (108 ) 205,640 Total $ 2,372,720 $ 40,078 $ (1,851 ) $ 2,410,947 $ 1,143,234 $ 30,039 $ (172 ) $ 1,173,101 December 31, 2015 U.S. Government agency obligations Issued by U.S. Government agencies $ 68,314 $ 555 $ (734 ) $ 68,135 $ — $ — $ — $ — Issued by U.S. Government sponsored agencies 258 23 — 281 101,782 3,282 — 105,064 Obligations of states and political subdivisions 134,719 3,922 (32 ) 138,609 55,892 2,918 — 58,810 Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 25,602 399 (189 ) 25,812 17,363 342 (49 ) 17,656 Issued by FNMA and FHLMC 222,899 2,956 (313 ) 225,542 10,368 311 — 10,679 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 1,584,338 9,541 (11,019 ) 1,582,860 820,012 4,951 (4,742 ) 820,221 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 278,429 2,689 (1,892 ) 279,226 182,401 1,700 (1,164 ) 182,937 Asset-backed securities and structured financial products 25,003 79 (125 ) 24,957 — — — — Total $ 2,339,562 $ 20,164 $ (14,304 ) $ 2,345,422 $ 1,187,818 $ 13,504 $ (5,955 ) $ 1,195,367 During 2013, Trustmark reclassified approximately $1.099 billion of securities available for sale to securities held to maturity. The securities were transferred at fair value, which became the cost basis for the securities held to maturity. At the date of transfer, the net unrealized holding loss on the available for sale securities totaled approximately $46.6 million ($28.8 million, net of tax). The net unrealized holding loss is amortized over the remaining life of the securities as a yield adjustment in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security. There were no gains or losses recognized as a result of the transfer. At September 30, 2016, the net unamortized, unrealized loss on the transferred securities included in accumulated other comprehensive loss in the accompanying balance sheet totaled approximately $25.7 million ($15.8 million, net of tax). Temporarily Impaired Securities The tables below include securities with gross unrealized losses segregated by length of impairment at September 30, 2016 and December 31, 2015 ($ in thousands): Less than 12 Months 12 Months or More Total September 30, 2016 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses U.S. Government agency obligations Issued by U.S. Government agencies $ 10,548 $ (86 ) $ 30,728 $ (421 ) $ 41,276 $ (507 ) Obligations of states and political subdivisions 7,495 (13 ) 969 (2 ) 8,464 (15 ) Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 9,072 (50 ) 249 (4 ) 9,321 (54 ) Issued by FNMA and FHLMC 100,191 (166 ) — — 100,191 (166 ) Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 72,256 (154 ) 98,118 (998 ) 170,374 (1,152 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 10,512 (21 ) 5,815 (108 ) 16,327 (129 ) Total $ 210,074 $ (490 ) $ 135,879 $ (1,533 ) $ 345,953 $ (2,023 ) December 31, 2015 U.S. Government agency obligations Issued by U.S. Government agencies $ 18,924 $ (81 ) $ 30,591 $ (653 ) $ 49,515 $ (734 ) Obligations of states and political subdivisions 4,289 (12 ) 2,842 (20 ) 7,131 (32 ) Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 20,300 (222 ) 1,863 (16 ) 22,163 (238 ) Issued by FNMA and FHLMC 82,177 (313 ) — — 82,177 (313 ) Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 1,135,533 (8,832 ) 238,152 (6,929 ) 1,373,685 (15,761 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 238,668 (2,902 ) 11,090 (154 ) 249,758 (3,056 ) Asset-backed securities and structured financial products 6,778 (125 ) — — 6,778 (125 ) Total $ 1,506,669 $ (12,487 ) $ 284,538 $ (7,772 ) $ 1,791,207 $ (20,259 ) The unrealized losses shown above are due to increases in market rates over the yields available at the time of purchase of the underlying securities and not credit quality. Because Trustmark does not intend to sell these securities and it is more likely than not that Trustmark will not be required to sell the investments before recovery of their amortized cost bases, which may be maturity, Trustmark does not consider these investments to be other-than-temporarily impaired at September 30, 2016. There were no other-than-temporary impairments for the three and nine months ended September 30, 2016 and 2015. Security Gains and Losses Gains and losses as a result of calls and dispositions of securities, as well as any associated proceeds, were as follows for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, Available for Sale 2016 2015 2016 2015 Proceeds from calls and sales of securities $ — $ — $ 24,693 $ — Gross realized gains — — 32 — Gross realized (losses) — — (342 ) — Realized gains and losses are determined using the specific identification method and are included in noninterest income as security losses, net. Securities Pledged Securities with a carrying value of $1.826 billion and $2.157 billion at September 30, 2016 and December 31, 2015, respectively, were pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law. At both September 30, 2016 and December 31, 2015, none of these securities were pledged under the Federal Reserve Discount Window program to provide additional contingency funding capacity. Contractual Maturities The amortized cost and estimated fair value of securities available for sale and held to maturity at September 30, 2016, by contractual maturity, are shown below ($ in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities Available for Sale Securities Held to Maturity Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 32,173 $ 32,377 $ 5,845 $ 5,845 Due after one year through five years 99,840 103,180 27,025 28,099 Due after five years through ten years 8,263 8,332 23,703 25,577 Due after ten years 39,725 39,269 — — 180,001 183,158 56,573 59,521 Mortgage-backed securities 2,192,719 2,227,789 1,086,661 1,113,580 Total $ 2,372,720 $ 2,410,947 $ 1,143,234 $ 1,173,101

Loans Held for Investment (LHFI

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI	9 Months Ended
	Sep. 30, 2016
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]
Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI	Note 3 – Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI At September 30, 2016 and December 31, 2015, LHFI consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Loans secured by real estate: Construction, land development and other land $ 766,685 $ 824,723 Secured by 1-4 family residential properties 1,592,453 1,649,501 Secured by nonfarm, nonresidential properties 1,916,153 1,736,476 Other real estate secured 317,680 211,228 Commercial and industrial loans 1,421,382 1,343,211 Consumer loans 170,073 169,135 State and other political subdivision loans 875,973 734,615 Other loans 438,805 422,496 LHFI 7,499,204 7,091,385 Less allowance for loan losses, LHFI 70,871 67,619 Net LHFI $ 7,428,333 $ 7,023,766 Loan Concentrations Trustmark does not have any loan concentrations other than those reflected in the preceding table, which exceed 10% of total LHFI. At September 30, 2016, Trustmark’s geographic loan distribution was concentrated primarily in its five key market regions: Alabama, Florida, Mississippi, Tennessee and Texas. Accordingly, the ultimate collectability of a substantial portion of these loans is susceptible to changes in market conditions in these areas. Nonaccrual/Impaired LHFI At September 30, 2016 and December 31, 2015, the carrying amounts of nonaccrual LHFI were $54.4 million and $55.3 million, respectively. Included in these amounts were $3.7 million and $7.4 million, respectively, of nonaccrual LHFI classified as troubled debt restructurings (TDRs). No material interest income was recognized in the income statement on nonaccrual LHFI for each of the periods ended September 30, 2016 and 2015. Trustmark considers all nonaccrual LHFI to be impaired loans. All commercial nonaccrual LHFI (including those classified as TDRs) over $500 thousand are specifically evaluated for impairment (specifically evaluated impaired LHFI) using a fair value approach. The remaining nonaccrual LHFI, which primarily consist of consumer loans secured by 1-4 family residential property, are not specifically reviewed. Consumer loans secured by 1-4 family residential property are generally charged off or written down when the credit becomes severely delinquent and the balance exceeds the fair value of the property less costs to sell. At September 30, 2016 and December 31, 2015, specifically evaluated impaired LHFI totaled $28.6 million and $26.5 million, respectively. Trustmark’s specifically evaluated impaired LHFI are primarily collateral dependent loans. Fair value estimates for collateral dependent loans are derived from appraised values based on the current market value or as is value of the collateral, normally from recently received and reviewed appraisals. Current appraisals are ordered on an annual basis based on the inspection date. Appraisals are obtained from state-certified appraisers and are based on certain assumptions, which may include construction or development status and the highest and best use of the property. These appraisals are reviewed by Trustmark’s Appraisal Review Department to ensure they are acceptable, and values are adjusted down for costs associated with asset disposal. Once this estimated net realizable value has been determined, the value used in the impairment assessment is updated. At the time a specifically evaluated impaired LHFI is deemed to be impaired, the full difference between book value and the most likely estimate of the collateral’s net realizable value is charged off. Charge-offs related to specifically evaluated impaired LHFI totaled $5.0 million and $9.7 million for the first nine months of 2016 and 2015, respectively. As subsequent events dictate and estimated net realizable values decline, required reserves may be established or further adjustments recorded. At September 30, 2016 and December 31, 2015, reserves related to specifically evaluated impaired LHFI totaled $4.5 million and $7.0 million, respectively. Provision recapture on specifically evaluated impaired LHFI totaled $2.0 million for the first nine months of 2016 compared to provision expense of $4.5 million for the first nine months of 2015. At September 30, 2016 and December 31, 2015, impaired LHFI, excluding the specifically evaluated impaired LHFI, totaled $25.8 million and $28.8 million, respectively. In addition, these impaired LHFI had allocated allowance for loan losses of $2.3 million and $2.0 million at the end of the respective periods. No material interest income was recognized in the income statement on impaired LHFI for each of the periods ended September 30, 2016 and 2015. The following tables detail LHFI individually and collectively evaluated for impairment at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 LHFI Evaluated for Impairment Individually Collectively Total Loans secured by real estate: Construction, land development and other land $ 4,724 $ 761,961 $ 766,685 Secured by 1-4 family residential properties 20,107 1,572,346 1,592,453 Secured by nonfarm, nonresidential properties 10,313 1,905,840 1,916,153 Other real estate secured 1,731 315,949 317,680 Commercial and industrial loans 16,525 1,404,857 1,421,382 Consumer loans 189 169,884 170,073 State and other political subdivision loans — 875,973 875,973 Other loans 821 437,984 438,805 Total $ 54,410 $ 7,444,794 $ 7,499,204 December 31, 2015 LHFI Evaluated for Impairment Individually Collectively Total Loans secured by real estate: Construction, land development and other land $ 6,123 $ 818,600 $ 824,723 Secured by 1-4 family residential properties 23,079 1,626,422 1,649,501 Secured by nonfarm, nonresidential properties 17,800 1,718,676 1,736,476 Other real estate secured 145 211,083 211,228 Commercial and industrial loans 7,622 1,335,589 1,343,211 Consumer loans 31 169,104 169,135 State and other political subdivision loans — 734,615 734,615 Other loans 512 421,984 422,496 Total $ 55,312 $ 7,036,073 $ 7,091,385 At September 30, 2016 and December 31, 2015, the carrying amount of LHFI individually evaluated for impairment consisted of the following ($ in thousands): September 30, 2016 LHFI Unpaid Principal Balance With No Related Allowance Recorded With an Allowance Recorded Total Carrying Amount Related Allowance Average Recorded Investment Loans secured by real estate: Construction, land development and other land $ 8,186 $ 3,113 $ 1,611 $ 4,724 $ 453 $ 5,424 Secured by 1-4 family residential properties 25,160 495 19,612 20,107 1,514 21,593 Secured by nonfarm, nonresidential properties 11,633 1,312 9,001 10,313 2,316 14,058 Other real estate secured 1,782 1,000 731 1,731 90 938 Commercial and industrial loans 18,203 12,055 4,470 16,525 2,305 12,073 Consumer loans 193 — 189 189 2 111 State and other political subdivision loans — — — — — — Other loans 966 — 821 821 154 667 Total $ 66,123 $ 17,975 $ 36,435 $ 54,410 $ 6,834 $ 54,864 December 31, 2015 LHFI Unpaid Principal Balance With No Related Allowance Recorded With an Allowance Recorded Total Carrying Amount Related Allowance Average Recorded Investment Loans secured by real estate: Construction, land development and other land $ 11,113 $ 3,395 $ 2,728 $ 6,123 $ 909 $ 9,995 Secured by 1-4 family residential properties 27,678 283 22,796 23,079 1,230 24,350 Secured by nonfarm, nonresidential properties 20,387 8,037 9,763 17,800 3,402 21,758 Other real estate secured 160 — 145 145 15 732 Commercial and industrial loans 9,880 1,137 6,485 7,622 3,304 9,863 Consumer loans 34 — 31 31 — 59 State and other political subdivision loans — — — — — — Other loans 642 — 512 512 128 570 Total $ 69,894 $ 12,852 $ 42,460 $ 55,312 $ 8,988 $ 67,327 A TDR occurs when a borrower is experiencing financial difficulties, and for related economic or legal reasons, a concession is granted to the borrower that Trustmark would not otherwise consider. Whatever the form of concession that might be granted by Trustmark, Management’s objective is to enhance collectability by obtaining more cash or other value from the borrower or by increasing the probability of receipt by granting the concession than by not granting it. Other concessions may arise from court proceedings or may be imposed by law. In addition, TDRs also include those credits that are extended or renewed to a borrower who is not able to obtain funds from sources other than Trustmark at a market interest rate for new debt with similar risk. All loans whose terms have been modified in a troubled debt restructuring are evaluated for impairment under FASB ASC Topic 310. Accordingly, Trustmark measures any loss on the restructuring in accordance with that guidance. A TDR in which Trustmark receives physical possession of the borrower’s assets, regardless of whether formal foreclosure or repossession proceedings take place, is accounted for in accordance with FASB ASC Subtopic 310-40, “Troubled Debt Restructurings by Creditors.” Thus, the loan is treated as if assets have been received in satisfaction of the loan and reported as a foreclosed asset. At September 30, 2016 and December 31, 2015, Trustmark held $880 thousand and $1.0 million, respectively, of foreclosed residential real estate as a result of foreclosure or in substance repossession of consumer mortgage LHFI classified as TDRs. There were no consumer mortgage LHFI classified as TDRs in the process of formal foreclosure proceedings at September 30, 2016 compared to $83 thousand at December 31, 2015. A TDR may be returned to accrual status if Trustmark is reasonably assured of repayment of principal and interest under the modified terms and the borrower has demonstrated sustained performance under those terms for a period of at least six months. Otherwise, the restructured loan must remain on nonaccrual. At September 30, 2016 and 2015, LHFI classified as TDRs totaled $3.7 million and $11.2 million, respectively, and were comprised of credits with interest-only payments for an extended period of time which totaled $1.6 million and $7.5 million, respectively. The remaining TDRs at September 30, 2016 and 2015 resulted from real estate loans discharged through Chapter 7 bankruptcy that were not reaffirmed or from payment or maturity extensions. For TDRs, Trustmark had a related loan loss allowance of $31 thousand and $1.2 million at September 30, 2016 and 2015, respectively. LHFI classified as TDRs are charged down to the most likely fair value estimate less an estimated cost to sell for collateral dependent loans, which would approximate net realizable value. Specific charge-offs related to TDRs for the nine months ended September 30, 2016 were $ 1.0 million compared to $806 thousand for the nine months ended September 30, 2015. The following tables illustrate the impact of modifications classified as TDRs as well as those TDRs modified within the last 12 months for which there was a payment default during the period for the periods presented ($ in thousands): Three Months Ended September 30, 2016 2015 Troubled Debt Restructurings Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Loans secured by 1-4 family residential properties — $ — $ — 2 $ 35 $ 35 Nine Months Ended September 30, 2016 2015 Troubled Debt Restructurings Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Construction, land development and other land loans 1 $ 14 $ 14 — $ — $ — Loans secured by 1-4 family residential properties 8 740 740 10 495 495 Loans secured by nonfarm, nonresidential properties — — — 4 3,512 3,512 Consumer loans 1 2 2 — — — Total 10 $ 756 $ 756 14 $ 4,007 $ 4,007 Nine Months Ended September 30, 2016 2015 TDRs that Subsequently Defaulted Number of Contracts Recorded Investment Number of Contracts Recorded Investment Loans secured by 1-4 family residential properties 1 $ 101 4 $ 243 Trustmark’s TDRs have resulted primarily from allowing the borrower to pay interest-only for an extended period of time rather than from forgiveness. Accordingly, as shown above, these TDRs have a similar recorded investment for both the pre-modification and post-modification disclosure. Trustmark has utilized loans 90 days or more past due to define payment default in determining TDRs that have subsequently defaulted. The following tables detail LHFI classified as TDRs by loan type at September 30, 2016 and 2015 ($ in thousands): September 30, 2016 Accruing Nonaccrual Total Loans secured by real estate: Construction, land development and other land $ — $ 556 $ 556 Secured by 1-4 family residential properties — 2,545 2,545 Secured by nonfarm, nonresidential properties — 179 179 Commercial and industrial loans — 387 387 Consumer loans — 2 2 Total TDRs $ — $ 3,669 $ 3,669 September 30, 2015 Accruing Nonaccrual Total Loans secured by real estate: Construction, land development and other land $ — $ 1,006 $ 1,006 Secured by 1-4 family residential properties 1,385 2,921 4,306 Secured by nonfarm, nonresidential properties 819 4,503 5,322 Other real estate secured — 62 62 Commercial and industrial loans — 477 477 Total TDRs $ 2,204 $ 8,969 $ 11,173 Credit Quality Indicators Trustmark’s loan portfolio credit quality indicators focus on six key quality ratios that are compared against bank tolerances. The loan indicators are total classified outstanding, total criticized outstanding, nonperforming loans, nonperforming assets, delinquencies and net loan losses. Due to the homogenous nature of consumer loans, Trustmark does not assign a formal internal risk rating to each credit and therefore the criticized and classified measures are primarily composed of commercial loans. In addition to monitoring portfolio credit quality indicators, Trustmark also measures how effectively the lending process is being managed and risks are being identified. As part of an ongoing monitoring process, Trustmark grades the commercial portfolio as it relates to credit file completion and financial statement exceptions, underwriting, collateral documentation and compliance with law as shown below: • Credit File Completeness and Financial Statement Exceptions – evaluates the quality and condition of credit files in terms of content, completeness and organization and focuses on efforts to obtain and document sufficient information to determine the quality and status of credits. Also included is an evaluation of the systems/procedures used to insure compliance with policy. • Underwriting – evaluates whether credits are adequately analyzed, appropriately structured and properly approved within loan policy requirements. A properly approved credit is approved by adequate authority in a timely manner with all conditions of approval fulfilled. Total policy exceptions measure the level of underwriting and other policy exceptions within a loan portfolio. • Collateral Documentation – focuses on the adequacy of documentation to perfect Trustmark’s collateral position and substantiate collateral value. Collateral exceptions measure the level of documentation exceptions within a loan portfolio. Collateral exceptions occur when certain collateral documentation is either not present, is not considered current or has expired. • Compliance with Law – focuses on underwriting, documentation, approval and reporting in compliance with banking laws and regulations. Primary emphasis is directed to the Financial Institutions Reform, Recovery and Enforcement Act of 1989 (FIRREA) and Regulation O requirements. Commercial Credits Trustmark has established a loan grading system that consists of ten individual credit risk grades (risk ratings) that encompass a range from loans where the expectation of loss is negligible to loans where loss has been established. The model is based on the risk of default for an individual credit and establishes certain criteria to delineate the level of risk across the ten unique credit risk grades. Credit risk grade definitions are as follows: • Risk Rate (RR) 1 through RR 6 – Grades one through six represent groups of loans that are not subject to adverse criticism as defined in regulatory guidance. Loans in these groups exhibit characteristics that represent low to moderate risk measured by using a variety of credit risk criteria such as cash flow coverage, debt service coverage, balance sheet leverage, liquidity, management experience, industry position, prevailing economic conditions, support from secondary sources of repayment and other credit factors that may be relevant to a specific loan. In general, these loans are supported by properly margined collateral and guarantees of principal parties. • Other Assets Especially Mentioned (Special Mention) - (RR 7) – a loan that has a potential weakness that if not corrected will lead to a more severe rating. This rating is for credits that are currently protected but potentially weak because of an adverse feature or condition that if not corrected will lead to a further downgrade. • Substandard (RR 8) – a loan that has at least one identified weakness that is well defined. This rating is for credits where the primary sources of repayment are not viable at the time of evaluation or where either the capital or collateral is not adequate to support the loan and the secondary means of repayment do not provide a sufficient level of support to offset the identified weakness. Loss potential exists in the aggregate amount of substandard loans but does not necessarily exist in individual loans. • Doubtful (RR 9) – a loan with an identified weakness that does not have a valid secondary source of repayment. Generally these credits have an impaired primary source of repayment and secondary sources are not sufficient to prevent a loss in the credit. The exact amount of the loss has not been determined at this time. • Loss (RR 10) – a loan or a portion of a loan that is deemed to be uncollectible. By definition, credit risk grades special mention (RR 7), substandard (RR 8), doubtful (RR 9) and loss (RR 10) are criticized loans while substandard (RR 8), doubtful (RR 9) and loss (RR 10) are classified loans. These definitions are standardized by all bank regulatory agencies and are generally equally applied to each individual lending institution. The remaining credit risk grades are considered pass credits and are solely defined by Trustmark. Each commercial loan is assigned a credit risk grade that is an indication for the likelihood of default and is not a direct indication of loss at default. The loss at default aspect of the subject risk ratings is neither uniform across the nine primary commercial loan groups or constant between the geographic areas. To account for the variance in the loss at default aspects of the risk rating system, the loss expectations for each risk rating are integrated into the allowance for loan loss methodology where the calculated loss at default is allotted for each individual risk rating with respect to the individual loan group and unique geographic area. The loss at default aspect of the reserve methodology is calculated each quarter as a component of the overall reserve factor for each risk grade by loan group and geographic area. To enhance this process, loans of a certain size that are rated in one of the criticized categories are routinely reviewed to establish an expectation of loss, if any, and if such examination indicates that the level of reserve is not adequate to cover the expectation of loss, a special reserve or impairment is generally applied. The distribution of the losses is accomplished by means of a loss distribution model that assigns a loss factor to each risk rating (1 to 9) in each commercial loan pool. A factor is not applied to risk rate 10 as loans classified as Losses are charged off within the period that the loss is determined and are not carried on Trustmark’s books over quarter-end. The expected loss distribution is spread across the various risk ratings by the perceived level of risk for loss. The nine grade scale described above ranges from a negligible risk of loss to an identified loss across its breadth. The loss distribution factors are graduated through the scale on a basis proportional to the degree of risk that appears manifest in each individual rating and assumes that migration through the loan grading system will occur. Each loan officer assesses the appropriateness of the internal risk rating assigned to their credits on an ongoing basis. Trustmark’s Asset Review area conducts independent credit quality reviews of the majority of Trustmark’s commercial loan portfolio concentrations both on the underlying credit quality of each individual loan portfolio as well as the adherence to Trustmark’s loan policy and the loan administration process. In general, Asset Review conducts reviews of each lending area within a six to eighteen month window depending on the overall credit quality results of the individual area. In addition to the ongoing internal risk rate monitoring described above, Trustmark’s Credit Quality Review Committee meets monthly and performs a review of all loans of $100 thousand or more that are either delinquent thirty days or more or on nonaccrual. This review includes recommendations regarding risk ratings, accrual status, charge-offs and appropriate servicing officer as well as evaluation of problem credits for determination of TDRs. Quarterly, the Credit Quality Review Committee reviews and modifies continuous action plans for all credits risk rated seven or worse for relationships of $100 thousand or more. In addition, the following reviews are performed on an annual basis: • Residential real estate developments - a development project analysis is performed on all projects regardless of size. Performance of the development is assessed through an evaluation of the number of lots remaining, payout ratios, and loan-to-value ratios. This analysis is reviewed by each senior credit officer for the respective market to determine the need for any risk rate or accrual status changes. • Non-owner occupied commercial real estate - a cash flow analysis is performed on all projects with an outstanding balance of $1.0 million or more. Confirmation is obtained that guarantor financial statements are current, taxes have been paid and there are no other issues that need to be addressed. This analysis is reviewed by each senior credit officer in the respective market to determine the need for any risk rate or accrual status changes. Consumer Credits Consumer LHFI that do not meet a minimum custom credit score are reviewed quarterly by Management. The Retail Credit Review Committee reviews the volume and percentage of approvals that did not meet the minimum passing custom score by region, individual location, and officer to ensure that Trustmark continues to originate quality loans. Trustmark monitors the levels and severity of past due consumer LHFI on a daily basis through its collection activities. A detailed assessment of consumer LHFI delinquencies is performed monthly at both a product and market level by delivery channel, which incorporates the perceived level of risk at time of underwriting. Trustmark also monitors its consumer LHFI delinquency trends by comparing them to quarterly industry averages. The tables below illustrate the carrying amount of LHFI by credit quality indicator at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 Commercial LHFI Pass - Categories 1-6 Special Mention - Category 7 Substandard - Category 8 Doubtful - Category 9 Subtotal Loans secured by real estate: Construction, land development and other land $ 687,123 $ 8,494 $ 9,410 $ 469 $ 705,496 Secured by 1-4 family residential properties 124,472 467 6,262 361 131,562 Secured by nonfarm, nonresidential properties 1,870,036 3,196 41,668 494 1,915,394 Other real estate secured 314,858 — 1,957 — 316,815 Commercial and industrial loans 1,304,137 9,094 107,405 746 1,421,382 Consumer loans — — — — — State and other political subdivision loans 858,168 6,450 11,355 — 875,973 Other loans 429,403 340 2,232 642 432,617 Total $ 5,588,197 $ 28,041 $ 180,289 $ 2,712 $ 5,799,239 Consumer LHFI Current Past Due 30-89 Days Past Due 90 Days or More Nonaccrual Subtotal Total LHFI Loans secured by real estate: Construction, land development and other land $ 60,546 $ 176 $ — $ 467 $ 61,189 $ 766,685 Secured by 1-4 family residential properties 1,435,347 8,173 717 16,654 1,460,891 1,592,453 Secured by nonfarm, nonresidential properties 759 — — — 759 1,916,153 Other real estate secured 865 — — — 865 317,680 Commercial and industrial loans — — — — — 1,421,382 Consumer loans 167,817 1,845 218 193 170,073 170,073 State and other political subdivision loans — — — — — 875,973 Other loans 6,188 — — — 6,188 438,805 Total $ 1,671,522 $ 10,194 $ 935 $ 17,314 $ 1,699,965 $ 7,499,204 December 31, 2015 Commercial LHFI Pass - Categories 1-6 Special Mention - Category 7 Substandard Category 8 Doubtful - Category 9 Subtotal Loans secured by real estate: Construction, land development and other land $ 746,227 $ — $ 15,637 $ 529 $ 762,393 Secured by 1-4 family residential properties 125,268 345 7,525 190 133,328 Secured by nonfarm, nonresidential properties 1,680,846 2,031 52,485 361 1,735,723 Other real estate secured 205,097 — 4,768 — 209,865 Commercial and industrial loans 1,295,760 9,473 37,284 694 1,343,211 Consumer loans — — — — — State and other political subdivision loans 713,616 12,478 8,521 — 734,615 Other loans 414,089 183 2,663 375 417,310 Total $ 5,180,903 $ 24,510 $ 128,883 $ 2,149 $ 5,336,445 Consumer LHFI Current Past Due 30-89 Days Past Due 90 Days or More Nonaccrual Subtotal Total LHFI Loans secured by real estate: Construction, land development and other land $ 62,158 $ 146 $ — $ 26 $ 62,330 $ 824,723 Secured by 1-4 family residential properties 1,485,914 7,565 2,058 20,636 1,516,173 1,649,501 Secured by nonfarm, nonresidential properties 753 — — — 753 1,736,476 Other real estate secured 1,363 — — — 1,363 211,228 Commercial and industrial loans — — — — — 1,343,211 Consumer loans 166,681 2,182 242 30 169,135 169,135 State and other political subdivision loans — — — — — 734,615 Other loans 5,186 — — — 5,186 422,496 Total $ 1,722,055 $ 9,893 $ 2,300 $ 20,692 $ 1,754,940 $ 7,091,385 Past Due LHFI The following tables provide an aging analysis of past due and nonaccrual LHFI by loan type at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 Past Due 30-59 Days 60-89 Days 90 Days or (1) Total Nonaccrual Current Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 1,136 $ 78 $ — $ 1,214 $ 4,724 $ 760,747 $ 766,685 Secured by 1-4 family residential properties 6,801 1,803 717 9,321 20,107 1,563,025 1,592,453 Secured by nonfarm, nonresidential properties 576 — 18 594 10,313 1,905,246 1,916,153 Other real estate secured 144 — — 144 1,731 315,805 317,680 Commercial and industrial loans 868 180 — 1,048 16,525 1,403,809 1,421,382 Consumer loans 1,465 380 218 2,063 189 167,821 170,073 State and other political subdivision loans — — — — — 875,973 875,973 Other loans 147 2 — 149 821 437,835 438,805 Total $ 11,137 $ 2,443 $ 953 $ 14,533 $ 54,410 $ 7,430,261 $ 7,499,204 (1) Past due 90 days or more but still accruing interest. December 31, 2015 Past Due 30-59 Days 60-89 Days 90 Days or (1) Total Nonaccrual Current Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 214 $ — $ — $ 214 $ 6,123 $ 818,386 $ 824,723 Secured by 1-4 family residential properties 6,203 1,800 2,058 10,061 23,079 1,616,361 1,649,501 Secured by nonfarm, nonresidential properties 437 88 — 525 17,800 1,718,151 1,736,476 Other real estate secured — — — — 145 211,083 211,228 Commercial and industrial loans 921 45 — 966 7,622 1,334,623 1,343,211 Consumer loans 1,835 347 242 2,424 31 166,680 169,135 State and other political subdivision loans 65 — — 65 — 734,550 734,615 Other loans 68 — — 68 512 421,916 422,496 Total $ 9,743 $ 2,280 $ 2,300 $ 14,323 $ 55,312 $ 7,021,750 $ 7,091,385 (1) Past due 90 days or more but still accruing interest. Past Due Loans Held for Sale (LHFS) LHFS past due 90 days or more totaled $25.6 million and $21.8 million at September 30, 2016 and December 31, 2015, respectively. LHFS past due 90 days or more are serviced loans eligible for repurchase, which are fully guaranteed by the Government National Mortgage Association (GNMA). GNMA optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing. At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100 percent of the remaining principal balance of the loan. This buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional. When Trustmark is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet as loans held for sale, regardless of whether Trustmark intends to exercise the buy-back option. These loans are reported as held for sale with the offsetting liability being reported as short-term borrowings. During the first quarter of 2015, Trustmark exercised its option to repurchase approximately $28.5 million of delinquent loans serviced for GNMA. These loans were subsequently sold to a third party under different repurchase provisions. Trustmark retained the servicing for these loans, which are subject to guarantees by FHA/VA. As a result of this repurchase and sale, the loans are no longer carried as LHFS. The transaction resulted in a gain of $304 thousand, which is included in mortgage banking, net for 2015. Trustmark did not exercise its buy-back option on any delinquent loans serviced for GNMA during the first nine months of 2016. Allowance for Loan Losses, LHFI Trustmark’s allowance for loan loss methodology for commercial LHFI is based upon regulatory guidance from its primary regulator and GAAP. The methodology segregates the commercial purpose and commercial construction LHFI portfolios into nine separate loan types (or pools) which have similar characteristics such as repayment, collateral and risk profiles. The nine basic loan pools are further segregated into Trustmark’s five key market regions, Alabama, Florida, Mississippi, Tennessee and Texas, to take into consideration the uniqueness of each market. A 10-point risk rating system is utilized for each separate loan pool to apply a reserve factor consisting of quantitative and qualitative components to determine the needed allowance by each loan type. As a result, there are 450 risk rate factors for commercial loan types. The nine separate pools are shown below: Commercial Purpose LHFI • Real Estate – Owner-Occupied • Real Estate – Non-Owner Occupied • Working Capital • Non-Working Capital • Land • Lots and Development • Political Subdivisions Commercial Construction LHFI • 1 to 4 Family • Non-1 to 4 Family The quantitative factors of the allowance methodology reflect a twelve-quarter rolling average of net charge-offs by loan type within each key market region. This allows for a greater sensitivity to current trends, such as economic changes, as well as current loss profiles and creates a more accurate depiction of historical losses. Qualitative factors used in the allowance methodology include the following: • National and regional economic trends and conditions • Impact of recent performance trends • Experience, ability and effectiveness of management • Adherence to Trustmark’s loan policies, procedures and internal controls • Collateral, financial and underwriting exception trends • Credit concentrations • Loan facility risk • Acquisitions • Catastrophe Each qualitative factor is converted to a scale ranging from 0 (No risk) to 100 (High Risk), other than the last two factors, which are applied on a dollar-for-dollar basis to ensure that the combination of such factors is proportional. The resulting ratings from the individual factors are weighted and summed to establish the weighted-average qualitative factor within each key market region. The allowance for loan loss methodology segregates the consumer LHFI por

Acquired Loans

Acquired Loans	9 Months Ended
	Sep. 30, 2016
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities [Abstract]
Acquired Loans	Note 4 – Acquired Loans At September 30, 2016 and December 31, 2015, acquired loans consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Noncovered Covered (1) Noncovered Covered Loans secured by real estate: Construction, land development and other land $ 25,040 $ — $ 41,623 $ 1,021 Secured by 1-4 family residential properties 72,689 3,912 86,950 10,058 Secured by nonfarm, nonresidential properties 110,606 — 135,626 4,638 Other real estate secured 20,903 — 23,860 1,286 Commercial and industrial loans 39,519 — 55,075 624 Consumer loans 3,878 — 5,641 — Other loans 19,190 — 23,936 73 Acquired loans 291,825 3,912 372,711 17,700 Less allowance for loan losses, acquired loans 11,330 50 11,259 733 Net acquired loans $ 280,495 $ 3,862 $ 361,452 $ 16,967 (1) Trustmark’s loss share agreement with the FDIC covering the acquired covered loans other than loans secured by 1-4 family residential properties expired on June 30, 2016. Trustmark’s loss share agreement with the FDIC covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021. Effective July 1, 2016, all acquired covered loans excluding the acquired covered loans secured by 1-4 family residential properties were reclassified to acquired noncovered loans. The following table presents changes in the net carrying value of the acquired loans for the periods presented ($ in thousands): Noncovered Covered Acquired Impaired Acquired Not ASC 310-30 (1) Acquired Impaired Acquired Not ASC 310-30 (1) Carrying value, net at January 1, 2015 $ 434,151 $ 81,091 $ 20,504 $ 1,604 Accretion to interest income 28,193 479 2,308 — Payments received, net (164,671 ) (15,484 ) (8,592 ) (33 ) Other (2) (1,589 ) — 391 — Less change in allowance for loan losses, acquired loans (718 ) — 785 — Carrying value, net at December 31, 2015 295,366 66,086 15,396 1,571 Transfers (3) 9,157 446 (9,157 ) (446 ) Accretion to interest income 13,498 40 853 — Payments received, net (75,875 ) (28,861 ) (4,203 ) (421 ) Other (2) 709 — (414 ) — Less change in allowance for loan losses, acquired loans (523 ) 452 1,137 (454 ) Carrying value, net at September 30, 2016 $ 242,332 $ 38,163 $ 3,612 $ 250 (1) "Acquired Not ASC 310-30" loans consist of revolving credit agreements and commercial leases that are not in scope for FASB ASC Topic 310-30, "Loans and Debt Securities Acquired with Deteriorated Credit Quality." (2) Includes miscellaneous timing adjustments as well as acquired loan terminations through foreclosure, charge-off and other terminations. (3) Covered acquired loans transferred to noncovered acquired loans as a result of expiration of the related indemnification agreement with the FDIC on June 30, 2016. Under FASB ASC Topic 310-30, the accretable yield is the excess of expected cash flows at acquisition over the initial fair value of acquired impaired loans and is recorded as interest income over the estimated life of the loans using the effective yield method if the timing and amount of the future cash flows is reasonably estimable. The following table presents changes in the accretable yield for the periods presented ($ in thousands): Nine Months Ended September 30, 2016 2015 Accretable yield at beginning of period $ (52,672 ) $ (77,149 ) Accretion to interest income 14,351 24,907 Disposals 4,306 8,194 Reclassification from nonaccretable difference (1) (7,046 ) (12,215 ) Accretable yield at end of period $ (41,061 ) $ (56,263 ) (1) Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cash flows. The following tables present the components of the allowance for loan losses on acquired loans for the periods presented ($ in thousands): Three Months Ended September 30, 2016 Nine Months Ended September 30, 2016 Noncovered Covered Total Noncovered Covered Total Balance at beginning of period $ 12,218 $ 262 $ 12,480 $ 11,259 $ 733 $ 11,992 Transfers (1) 215 (215 ) — 215 (215 ) — Provision for loan losses, acquired loans 686 5 691 2,969 (362 ) 2,607 Loans charged-off (2,590 ) — (2,590 ) (4,959 ) (82 ) (5,041 ) Recoveries 801 (2 ) 799 1,846 (24 ) 1,822 Net charge-offs (1,789 ) (2 ) (1,791 ) (3,113 ) (106 ) (3,219 ) Balance at end of period $ 11,330 $ 50 $ 11,380 $ 11,330 $ 50 $ 11,380 Three Months Ended September 30, 2015 Nine Months Ended September 30, 2015 Noncovered Covered Total Noncovered Covered Total Balance at beginning of period $ 11,927 $ 702 $ 12,629 $ 10,541 $ 1,518 $ 12,059 Provision for loan losses, acquired loans 1,221 35 1,256 2,797 (369 ) 2,428 Loans charged-off (2,456 ) (110 ) (2,566 ) (5,024 ) (560 ) (5,584 ) Recoveries 725 141 866 3,103 179 3,282 Net (charge-offs) recoveries (1,731 ) 31 (1,700 ) (1,921 ) (381 ) (2,302 ) Balance at end of period $ 11,417 $ 768 $ 12,185 $ 11,417 $ 768 $ 12,185 (1) The allowance for loan losses on covered acquired loans other than loans secured by 1-4 family residential properties transferred to the allowance for loan losses on noncovered acquired loans as a result of expiration of the related indemnification agreement with the FDIC on June 30, 2016. As discussed in Note 3 - Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI, Trustmark has established a loan grading system that consists of ten individual credit risk grades (risk ratings) that encompass a range from loans where the expectation of loss is negligible to loans where loss has been established. The model is based on the risk of default for an individual credit and establishes certain criteria to segregate the level of risk across the ten unique risk ratings. These credit quality measures are unique to commercial loans. Credit quality for consumer loans is based on individual credit scores, aging status of the loan and payment activity. The tables below illustrate the carrying amount of acquired loans by credit quality indicator at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 Commercial Loans Pass - Categories 1-6 Special Mention - Category 7 Substandard - Category 8 Doubtful - Category 9 Subtotal Noncovered Loans: Loans secured by real estate: Construction, land development and other land $ 14,624 $ 117 $ 7,900 $ 322 $ 22,963 Secured by 1-4 family residential properties 17,629 56 4,249 310 22,244 Secured by nonfarm, nonresidential properties 88,799 1,071 20,167 516 110,553 Other real estate secured 16,313 — 3,482 673 20,468 Commercial and industrial loans 23,860 23 14,230 1,406 39,519 Consumer loans — — — — — Other loans 13,361 — 5,665 162 19,188 Total noncovered loans 174,586 1,267 55,693 3,389 234,935 Covered Loans: (1) Loans secured by real estate: Construction, land development and other land — — — — — Secured by 1-4 family residential properties 185 12 60 — 257 Secured by nonfarm, nonresidential properties — — — — — Other real estate secured — — — — — Commercial and industrial loans — — — — — Other loans — — — — — Total covered loans 185 12 60 — 257 Total acquired loans $ 174,771 $ 1,279 $ 55,753 $ 3,389 $ 235,192 Consumer Loans Current Past Due 30-89 Days Past Due 90 Days or More Nonaccrual (2) Subtotal Total Acquired Loans Noncovered Loans: Loans secured by real estate: Construction, land development and other land $ 2,066 $ 3 $ 8 $ — $ 2,077 $ 25,040 Secured by 1-4 family residential properties 47,666 1,783 902 94 50,445 72,689 Secured by nonfarm, nonresidential properties 53 — — — 53 110,606 Other real estate secured 435 — — — 435 20,903 Commercial and industrial loans — — — — — 39,519 Consumer loans 3,825 48 5 — 3,878 3,878 Other loans 2 — — — 2 19,190 Total noncovered loans 54,047 1,834 915 94 56,890 291,825 Covered Loans: (1) Loans secured by real estate: Construction, land development and other land — — — — — — Secured by 1-4 family residential properties 3,311 136 208 — 3,655 3,912 Secured by nonfarm, nonresidential properties — — — — — — Other real estate secured — — — — — — Commercial and industrial loans — — — — — — Other loans — — — — — — Total covered loans 3,311 136 208 — 3,655 3,912 Total acquired loans $ 57,358 $ 1,970 $ 1,123 $ 94 $ 60,545 $ 295,737 (1) Total dollar balances are presented in this table; however, these loans are covered by the loss-share agreement with the FDIC. TNB is at risk for only 20% of the losses incurred on these loans. (2) Acquired loans not accounted for under FASB ASC Topic 310-30. December 31, 2015 Commercial Loans Pass - Categories 1-6 Special Mention - Category 7 Substandard - Category 8 Doubtful - Category 9 Subtotal Noncovered Loans: Loans secured by real estate: Construction, land development and other land $ 15,839 $ 253 $ 19,252 $ 3,874 $ 39,218 Secured by 1-4 family residential properties 22,272 27 5,033 331 27,663 Secured by nonfarm, nonresidential properties 106,924 2,301 25,690 711 135,626 Other real estate secured 19,346 — 3,777 731 23,854 Commercial and industrial loans 36,670 844 15,526 2,035 55,075 Consumer loans — — — — — Other loans 17,150 — 6,624 162 23,936 Total noncovered loans 218,201 3,425 75,902 7,844 305,372 Covered Loans: (1) Loans secured by real estate: Construction, land development and other land 235 — 588 119 942 Secured by 1-4 family residential properties 869 107 534 — 1,510 Secured by nonfarm, nonresidential properties 4,060 35 472 — 4,567 Other real estate secured 730 — 111 — 841 Commercial and industrial loans 560 22 42 — 624 Other loans 70 — — — 70 Total covered loans 6,524 164 1,747 119 8,554 Total acquired loans $ 224,725 $ 3,589 $ 77,649 $ 7,963 $ 313,926 Consumer Loans Current Past Due 30-89 Days Past Due 90 Days or More Nonaccrual (2) Subtotal Total Acquired Loans Noncovered Loans: Loans secured by real estate: Construction, land development and other land $ 2,353 $ 24 $ 28 $ — $ 2,405 $ 41,623 Secured by 1-4 family residential properties 56,371 1,841 930 145 59,287 86,950 Secured by nonfarm, nonresidential properties — — — — — 135,626 Other real estate secured 6 — — — 6 23,860 Commercial and industrial loans — — — — — 55,075 Consumer loans 5,498 142 1 — 5,641 5,641 Other loans — — — — — 23,936 Total noncovered loans 64,228 2,007 959 145 67,339 372,711 Covered Loans: (1) Loans secured by real estate: Construction, land development and other land 70 9 — — 79 1,021 Secured by 1-4 family residential properties 7,472 314 762 — 8,548 10,058 Secured by nonfarm, nonresidential properties 71 — — — 71 4,638 Other real estate secured 445 — — — 445 1,286 Commercial and industrial loans — — — — — 624 Other loans 3 — — — 3 73 Total covered loans 8,061 323 762 — 9,146 17,700 Total acquired loans $ 72,289 $ 2,330 $ 1,721 $ 145 $ 76,485 $ 390,411 (1) Total dollar balances are presented in this table; however, these loans are covered by the loss-share agreement with the FDIC. TNB is at risk for only 20% of the losses incurred on these loans. (2) Acquired loans not accounted for under FASB ASC Topic 310-30. At September 30, 2016 and December 31, 2015, there were no acquired impaired loans accounted for under FASB ASC Topic 310-30 classified as nonaccrual loans. At September 30, 2016, approximately $653 thousand of acquired loans not accounted for under FASB ASC Topic 310-30 were classified as nonaccrual loans, compared to approximately $1.0 million of acquired loans at December 31, 2015. The following tables provide an aging analysis of contractually past due and nonaccrual acquired loans, by loan type at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 Past Due 30-59 Days 60-89 Days 90 Days or More (1) Total Nonaccrual (2) Current Loans Total Acquired Loans Noncovered loans: Loans secured by real estate: Construction, land development and other land $ 203 $ 12 $ 889 $ 1,104 $ — $ 23,936 $ 25,040 Secured by 1-4 family residential properties 1,679 333 934 2,946 112 69,631 72,689 Secured by nonfarm, nonresidential properties 225 32 857 1,114 338 109,154 110,606 Other real estate secured 112 — 1,458 1,570 — 19,333 20,903 Commercial and industrial loans 832 33 1 866 203 38,450 39,519 Consumer loans 48 — 5 53 — 3,825 3,878 Other loans — — — — — 19,190 19,190 Total noncovered loans 3,099 410 4,144 7,653 653 283,519 291,825 Covered loans: Loans secured by real estate: Construction, land development and other land — — — — — — — Secured by 1-4 family residential properties 55 81 208 344 — 3,568 3,912 Secured by nonfarm, nonresidential properties — — — — — — — Other real estate secured — — — — — — — Commercial and industrial loans — — — — — — — Other loans — — — — — — — Total covered loans 55 81 208 344 — 3,568 3,912 Total acquired loans $ 3,154 $ 491 $ 4,352 $ 7,997 $ 653 $ 287,087 $ 295,737 (1) Past due 90 days or more but still accruing interest. (2) Acquired loans not accounted for under FASB ASC Topic 310-30. December 31, 2015 Past Due 30-59 Days 60-89 Days 90 Days or More (1) Total Nonaccrual (2) Current Loans Total Acquired Loans Noncovered loans: Loans secured by real estate: Construction, land development and other land $ 24 $ 114 $ 13,021 $ 13,159 $ — $ 28,464 $ 41,623 Secured by 1-4 family residential properties 1,544 636 1,220 3,400 387 83,163 86,950 Secured by nonfarm, nonresidential properties 192 195 5,913 6,300 144 129,182 135,626 Other real estate secured 9 — 737 746 — 23,114 23,860 Commercial and industrial loans 82 4 184 270 429 54,376 55,075 Consumer loans 119 23 1 143 — 5,498 5,641 Other loans 85 16 — 101 — 23,835 23,936 Total noncovered loans 2,055 988 21,076 24,119 960 347,632 372,711 Covered loans: Loans secured by real estate: Construction, land development and other land 9 — 119 128 — 893 1,021 Secured by 1-4 family residential properties 428 132 978 1,538 — 8,520 10,058 Secured by nonfarm, nonresidential properties 167 478 — 645 — 3,993 4,638 Other real estate secured — — — — — 1,286 1,286 Commercial and industrial loans — — — — 51 573 624 Other loans — — — — — 73 73 Total covered loans 604 610 1,097 2,311 51 15,338 17,700 Total acquired loans $ 2,659 $ 1,598 $ 22,173 $ 26,430 $ 1,011 $ 362,970 $ 390,411 (1) Past due 90 days or more but still accruing interest. (2) Acquired loans not accounted for under FASB ASC Topic 310-30.

Mortgage Banking

Mortgage Banking	9 Months Ended
	Sep. 30, 2016
Mortgage Banking [Abstract]
Mortgage Banking	Note 5 – Mortgage Banking The activity in the mortgage servicing rights (MSR) is detailed in the table below for the periods presented ($ in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of period $ 74,007 $ 64,358 Origination of servicing assets 12,392 13,320 Change in fair value: Due to market changes (13,518 ) (433 ) Due to run-off (7,367 ) (7,436 ) Balance at end of period $ 65,514 $ 69,809 During the first nine months of 2016 and 2015, Trustmark sold $1.016 billion and $930.5 million, respectively, of residential mortgage loans. Pretax gains on these sales were recorded to noninterest income in mortgage banking, net and totaled $14.5 million for the first nine months of 2016 compared to $13.3 million for the first nine months of 2015. The table below details the mortgage loans sold and serviced for others at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 December 31, 2015 Federal National Mortgage Association $ 3,933,746 $ 3,750,685 Government National Mortgage Association 2,238,400 2,111,797 Federal Home Loan Mortgage Corporation 58,236 67,817 Other 34,214 41,013 Total mortgage loans sold and serviced for others $ 6,264,596 $ 5,971,312 Trustmark is subject to losses in its loan servicing portfolio due to loan foreclosures. Trustmark has obligations to either repurchase the outstanding principal balance of a loan or make the purchaser whole for the economic benefits of a loan if it is determined that the loan sold was in violation of representations or warranties made by Trustmark at the time of the sale, herein referred to as mortgage loan servicing putback expenses. Such representations and warranties typically include those made regarding loans that had missing or insufficient file documentation, loans that do not meet investor guidelines, loans in which the appraisal does not support the value and/or loans obtained through fraud by the borrowers or other third parties. Generally, putback requests may be made until the loan is paid in full. However, mortgage loans delivered to Federal National Mortgage Association (FNMA) and Federal Home Loan Mortgage Corporation (FHLMC) on or after January 1, 2013 are subject to the Lending and Selling Representations and Warranties Framework updated in May 2014, which provides certain instances in which FNMA and FHLMC will not exercise their remedies, including a putback request, for breaches of certain selling representations and warranties, such as payment history and quality control review. When a putback request is received, Trustmark evaluates the request and takes appropriate actions based on the nature of the request. Effective January 1, 2013, Trustmark was required by FNMA and FHLMC to provide a response to putback requests within 60 days of the date of receipt. Currently, putback requests primarily relate to 2009 through 2013 vintage mortgage loans. The total mortgage loan servicing putback expenses incurred by Trustmark during the first nine months of 2016 were $315 thousand compared to $210 thousand during the same time period in 2015. Changes in the reserve for mortgage loan servicing putback expense for mortgage loans delivered to FNMA in periods not covered by the November 2013 Resolution Agreement between Trustmark and FNMA and to other entities were as follows for the periods presented ($ in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of period $ 1,685 $ 1,170 Provision for putback expenses 315 210 (Losses) gains (944 ) 211 Balance at end of period $ 1,056 $ 1,591 There is inherent uncertainty in reasonably estimating the requirement for reserves against potential future mortgage loan servicing putback expenses. Future putback expenses are dependent on many subjective factors, including the review procedures of the purchasers and the potential refinance activity on loans sold with servicing released and the subsequent consequences under the representations and warranties. Trustmark believes that it has appropriately reserved for potential mortgage loan servicing putback requests.

Other Real Estate and Covered O

Other Real Estate and Covered Other Real Estate	9 Months Ended
	Sep. 30, 2016
Other Real Estate And Foreclosed Assets [Abstract]
Other Real Estate and Covered Other Real Estate	Note 6 –Other Real Estate and Covered Other Real Estate Other Real Estate, excluding Covered Other Real Estate At September 30, 2016, Trustmark’s geographic other real estate distribution was concentrated primarily in its five key market regions: Alabama, Florida, Mississippi, Tennessee and Texas. The ultimate recovery of a substantial portion of the carrying amount of other real estate, excluding covered other real estate, is susceptible to changes in market conditions in these areas. For the periods presented, changes and gains, net on other real estate, excluding covered other real estate, were as follows ($ in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of period $ 77,177 $ 92,509 Additions 21,972 26,832 Disposals (30,494 ) (33,015 ) Write-downs (3,662 ) (2,371 ) Balance at end of period $ 64,993 $ 83,955 Gain, net on the sale of other real estate included in other real estate expense $ 5,350 $ 2,116 At September 30, 2016 and December 31, 2015, other real estate, excluding covered other real estate, by type of property consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Construction, land development and other land properties $ 38,345 $ 47,550 1-4 family residential properties 8,037 10,732 Nonfarm, nonresidential properties 18,611 16,717 Other real estate properties — 2,178 Total other real estate, excluding covered other real estate $ 64,993 $ 77,177 At September 30, 2016 and December 31, 2015, other real estate, excluding covered other real estate, by geographic location consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Alabama $ 15,574 $ 21,578 Florida 25,147 29,579 Mississippi (1) 16,659 14,312 Tennessee (2) 6,061 9,974 Texas 1,552 1,734 Total other real estate, excluding covered other real estate $ 64,993 $ 77,177 (1) Mississippi includes Central and Southern Mississippi Regions (2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions Covered Other Real Estate On July 1, 2016, $388 thousand of covered other real estate was transferred to other real estate, excluding covered other real estate, as a result of the expiration of a loss-share agreement with the FDIC on June 30, 2016. As of September 30, 2016, Trustmark had no covered other real estate. The remaining loss-share agreement with the FDIC, which covers loans secured by 1-4 family residential properties, will expire in 2021. Should a loan covered by the remaining loss-share agreement be foreclosed, the related property will be classified as covered other real estate. For the periods presented, changes and gains (losses), net on covered other real estate were as follows ($ in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of period $ 1,651 $ 6,060 Transfers from covered loans 456 266 FASB ASC 310-30 adjustment for the residual recorded investment (12 ) (902 ) Net transfers from covered loans 444 (636 ) Disposals (1,679 ) (1,404 ) Transfers to noncovered other real estate (388 ) — Write-downs (28 ) (1,155 ) Balance at end of period $ — $ 2,865 Gain (loss), net on the sale of covered other real estate included in other real estate expense $ 801 $ (54 ) At September 30, 2016 and December 31, 2015, covered other real estate by type of property consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Construction, land development and other land properties $ — $ 638 1-4 family residential properties — 223 Nonfarm, nonresidential properties — 399 Other real estate properties — 391 Total covered other real estate $ — $ 1,651

Deposits

Deposits	9 Months Ended
	Sep. 30, 2016
Deposits [Abstract]
Deposits	Note 7 – Deposits At September 30, 2016 and December 31, 2015, deposits consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Noninterest-bearing demand $ 3,111,603 $ 2,998,694 Interest-bearing demand 1,783,655 1,938,497 Savings 3,133,286 2,970,997 Time 1,657,157 1,680,042 Total $ 9,685,701 $ 9,588,230

Securities Sold Under Repurchas

Securities Sold Under Repurchase Agreements	9 Months Ended
	Sep. 30, 2016
Securities Sold Under Agreements To Repurchase [Abstract]
Securities Sold Under Repurchase Agreements	Note 8 – Securities Sold Under Repurchase Agreements Trustmark utilizes securities sold under repurchase agreements as a source of borrowing in connection with overnight repurchase agreements offered to commercial deposit customers by using its unencumbered investment securities as collateral. Trustmark accounts for its securities sold under repurchase agreements as secured borrowings in accordance with FASB ASC Topic 860-30, “Transfers and Servicing – Secured Borrowing and Collateral.” Securities sold under repurchase agreements are stated at the amount of cash received in connection with the transaction. Trustmark monitors collateral levels on a continual basis and may be required to provide additional collateral based on the fair value of the underlying securities. Trustmark’s repurchase agreements are transacted under master repurchase agreements that give Trustmark, in the event of default by the counterparty, the right of offset with the same counterparty. As of September 30, 2016, all repurchase agreements were short-term and consisted primarily of sweep repurchase arrangements, under which excess deposits are “swept” into overnight repurchase agreements with Trustmark. The following table presents the securities sold under repurchase agreements by collateral pledged at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 December 31, 2015 U.S. Government agency obligations Issued by U.S. Government sponsored agencies $ — $ 22,516 Mortgage-backed securities Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 122,865 102,604 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 41,067 — Total securities sold under repurchase agreements $ 163,932 $ 125,120

Defined Benefit and Other Postr

Defined Benefit and Other Postretirement Benefits	9 Months Ended
	Sep. 30, 2016
Compensation And Retirement Disclosure [Abstract]
Defined Benefit and Other Postretirement Benefits	Note 9 – Defined Benefit and Other Postretirement Benefits Qualified Pension Plans Trustmark maintains a noncontributory tax-qualified defined benefit pension plan (Trustmark Capital Accumulation Plan, the “Plan”), in which substantially all associates who began employment prior to 2007 participate. The Plan provides retirement benefits that are based on the length of credited service and final average compensation, as defined in the Plan, and vest upon three years of service. Benefit accruals under the plan have been frozen since 2009, with the exception of certain associates covered through plans obtained in acquisitions that were subsequently merged into the Plan. Other than the associates covered through these acquired plans that were merged into the Plan, associates have not earned additional benefits, except for interest as required by law, since the Plan was frozen. Current and former associates who participate in the Plan retain their right to receive benefits that accrued before the Plan was frozen. On July 26, 2016, the Board of Directors of Trustmark authorized the termination of the Plan, effective as of December 31, 2016. To satisfy commitments made by Trustmark to associates (collectively, the “Continuing Associates”) covered through acquired plans that were merged into the Plan, the Board also approved the spin-off of the portion of the Plan associated with the accrued benefits of the Continuing Associates into a new plan titled the Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions (the “Spin-Off Plan”), effective as of December 31, 2016, immediately prior to the termination of the Plan. In order to terminate the Plan, in accordance with Internal Revenue Service and Pension Benefit Guaranty Corporation requirements, Trustmark is required to fully fund the Plan on a termination basis and will contribute the additional assets necessary to do so. The final distributions will be made from current plan assets and a one-time pension settlement expense will be recognized when paid by Trustmark during the second quarter of 2017. Further, as a result of Trustmark’s de-risking investment strategy for the Plan as of June 30, 2016, the expected rate of return on plan assets during the second half of 2016 will decrease from 6.0% to 2.5%. Accordingly, Trustmark's increased periodic benefit costs for the Plan during the third quarter of 2016 was $664 thousand. Participants in the Plan will have a choice of receiving a lump sum cash payment or annuity payments under a group annuity contract purchased from an insurance carrier, subject to certain exceptions. As a result of the termination of the Plan, each participant will become fully vested in his or her accrued benefits under the Plan. The Board reserved the right to defer or revoke the termination of the Plan if circumstances change such that deferral or revocation would be warranted, but has no intent to do so at this time. The following table presents information regarding the net periodic benefit cost for the Plan for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Service cost $ 106 $ 127 $ 322 $ 387 Interest cost 847 867 2,507 2,593 Expected return on plan assets (426 ) (1,297 ) (2,470 ) (3,890 ) Recognized net loss due to lump sum settlements 463 603 3,134 1,499 Recognized net actuarial loss 714 969 2,035 2,907 Net periodic benefit cost $ 1,704 $ 1,269 $ 5,528 $ 3,496 The range of potential contributions to the Plan is determined annually by the Plan’s actuary in accordance with applicable IRS rules and regulations. Trustmark’s policy is to fund amounts that are sufficient to satisfy the annual minimum funding requirements and do not exceed the maximum that is deductible for federal income tax purposes. The actual amount of the contribution is determined annually based on the Plan’s funded status and return on plan assets as of the measurement date, which is December 31. For the plan year ending December 31, 2016, Trustmark’s minimum required contribution to the Plan is expected to be zero; however, Management and the Board of Directors of Trustmark will monitor the Plan throughout 2016 to determine any additional funding requirements by the Plan’s measurement date. Supplemental Retirement Plans Trustmark maintains a nonqualified supplemental retirement plan covering key executive officers and senior officers as well as directors who have elected to defer fees. The plan provides for retirement and/or death benefits based on a participant’s covered salary or deferred fees. Although plan benefits may be paid from Trustmark’s general assets, Trustmark has purchased life insurance contracts on the participants covered under the plan, which may be used to fund future benefit payments under the plan. The measurement date for the plan is December 31. As a result of the BancTrust merger on February 15, 2013, Trustmark became the administrator of an additional nonqualified supplemental retirement plan, for which the plan benefits were frozen prior to the merger date. The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Service cost $ 73 $ 107 $ 221 $ 323 Interest cost 542 520 1,630 1,563 Amortization of prior service cost 63 63 188 188 Recognized net actuarial loss 214 246 649 745 Net periodic benefit cost $ 892 $ 936 $ 2,688 $ 2,819

Stock and Incentive Compensatio

Stock and Incentive Compensation Plans	9 Months Ended
	Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock and Incentive Compensation Plans	Note 10 – Stock and Incentive Compensation Plans Trustmark has granted stock and incentive compensation awards subject to the provisions of the Stock and Incentive Compensation Plan (the Stock Plan). Current outstanding and future grants of stock and incentive compensation awards are subject to the provisions of the Stock Plan, which is designed to provide flexibility to Trustmark regarding its ability to motivate, attract and retain the services of key associates and directors. The Stock Plan also allows Trustmark to grant nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units and performance units to key associates and directors. Restricted Stock Grants Performance Awards Trustmark’s performance awards vest over three years and are granted to Trustmark’s executive and senior management teams. Performance awards granted vest based on performance goals of return on average tangible equity and total shareholder return compared to a defined peer group. Performance awards are valued utilizing a Monte Carlo simulation model to estimate fair value of the awards at the grant date. These awards are recognized using the straight-line method over the requisite service period. These awards provide for achievement shares if performance measures exceed 100%. The restricted share agreement provides for voting rights and dividend privileges. Time-Vested Awards Trustmark’s time-vested awards vest over three years and are granted to members of Trustmark’s Board of Directors as well as Trustmark’s executive and senior management teams. Time-vested awards are valued utilizing the fair value of Trustmark’s stock at the grant date. These awards are recognized on the straight-line method over the requisite service period. The following table summarizes the Stock Plan activity for the periods presented: Three Months Ended September 30, 2016 Performance Awards Time-Vested Awards Nonvested shares, beginning of period 239,006 327,197 Granted — 2,000 Released from restriction (1,587 ) (3,379 ) Forfeited (283 ) (917 ) Nonvested shares, end of period 237,136 324,901 Nine Months Ended September 30, 2016 Performance Awards Time-Vested Awards Nonvested shares, beginning of period 212,309 306,657 Granted 99,116 139,291 Released from restriction (40,888 ) (105,717 ) Forfeited (33,401 ) (15,330 ) Nonvested shares, end of period 237,136 324,901 The following table presents information regarding compensation expense for awards under the Stock Plan for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Performance awards $ 382 $ 319 $ 789 $ 883 Time-vested awards 559 638 1,952 1,855 Total compensation expense $ 941 $ 957 $ 2,741 $ 2,738

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Contingencies	Note 11 – Contingencies Lending Related Trustmark makes commitments to extend credit and issues standby and commercial letters of credit (letters of credit) in the normal course of business in order to fulfill the financing needs of its customers. The carrying amount of commitments to extend credit and letters of credit approximates the fair value of such financial instruments. These amounts are not material to Trustmark’s financial statements. Commitments to extend credit are agreements to lend money to customers pursuant to certain specified conditions. Commitments generally have fixed expiration dates or other termination clauses. Because many of these commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The exposure to credit loss in the event of nonperformance by the other party to the commitments to extend credit is represented by the contract amount of those instruments. Trustmark applies the same credit policies and standards as it does in the lending process when making these commitments. The collateral obtained is based upon the assessed creditworthiness of the borrower. At September 30, 2016 and 2015, Trustmark had unused commitments to extend credit of $3.110 billion and $2.724 billion, respectively. Letters of credit are conditional commitments issued by Trustmark to insure the performance of a customer to a third-party. A financial standby letter of credit irrevocably obligates Trustmark to pay a third-party beneficiary when a customer fails to repay an outstanding loan or debt instrument. A performance standby letter of credit irrevocably obligates Trustmark to pay a third-party beneficiary when a customer fails to perform some contractual, nonfinancial obligation. When issuing letters of credit, Trustmark uses essentially the same policies regarding credit risk and collateral, which are followed in the lending process. At September 30, 2016 and 2015, Trustmark’s maximum exposure to credit loss in the event of nonperformance by the other party for letters of credit was $113.5 million and $132.2 million, respectively. These amounts consist primarily of commitments with maturities of less than three years, which have an immaterial carrying value. Trustmark holds collateral to support standby letters of credit when deemed necessary. As of September 30, 2016 and 2015, the fair value of collateral held was $27.7 million and $31.7 million, respectively. Legal Proceedings Trustmark’s wholly-owned subsidiary, TNB, has been named as a defendant in three lawsuits related to the collapse of the Stanford Financial Group. The first is a purported class action complaint that was filed on August 23, 2009 in the District Court of Harris County, Texas, by Peggy Roif Rotstain, Guthrie Abbott, Catherine Burnell, Steven Queyrouze, Jaime Alexis Arroyo Bornstein and Juan C. Olano (collectively, Class Plaintiffs), on behalf of themselves and all others similarly situated, naming TNB and four other financial institutions unaffiliated with Trustmark as defendants. The complaint seeks to recover (i) alleged fraudulent transfers from each of the defendants in the amount of fees and other monies received by each defendant from entities controlled by R. Allen Stanford (collectively, the Stanford Financial Group) and (ii) damages allegedly attributable to alleged conspiracies by one or more of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud on the asserted grounds that defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme. Plaintiffs have demanded a jury trial. Plaintiffs did not quantify damages. In November 2009, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings. In May 2010, all defendants (including TNB) filed motions to dismiss the lawsuit. In August 2010, the court authorized and approved the formation of an Official Stanford Investors Committee (OSIC) to represent the interests of Stanford investors and, under certain circumstances, to file legal actions for the benefit of Stanford investors. In December 2011, the OSIC filed a motion to intervene in this action. In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues. In December 2012, the court granted the OSIC’s motion to intervene, and the OSIC filed an Intervenor Complaint against one of the other defendant financial institutions. In February 2013, the OSIC filed a second Intervenor Complaint that asserts claims against TNB and the remaining defendant financial institutions. The OSIC seeks to recover: (i) alleged fraudulent transfers in the amount of the fees each of the defendants allegedly received from Stanford Financial Group, the profits each of the defendants allegedly made from Stanford Financial Group deposits, and other monies each of the defendants allegedly received from Stanford Financial Group; (ii) damages attributable to alleged conspiracies by each of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud and conversion on the asserted grounds that the defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme; and (iii) punitive damages. The OSIC did not quantify damages. In July 2013, all defendants (including TNB) filed motions to dismiss the OSIC’s claims. In March 2015, the court entered an order authorizing the parties to conduct discovery regarding class certification and setting a deadline for the parties to complete briefing on class certification issues. In April 2015, the court granted in part and denied in part the defendants’ motions to dismiss the Class Plaintiffs’ claims and the OSIC’s claims. The court dismissed all of the Class Plaintiffs’ fraudulent transfer claims and dismissed certain of the OSIC’s claims. The court denied the motions by TNB and the other financial institution defendants to dismiss the OSIC’s constructive fraudulent transfer claims. On June 23, 2015, the court allowed the Class Plaintiffs to file a Second Amended Class Action Complaint (SAC), which asserted new claims against TNB and certain of the other defendants for (i) aiding, abetting and participating in a fraudulent scheme, (ii) aiding, abetting and participating in violations of the Texas Securities Act, (iii) aiding, abetting and participating in breaches of fiduciary duty, (iv) aiding, abetting and participating in conversion and (v) conspiracy. On July 14, 2015, the defendants (including TNB) filed motions to dismiss the SAC and to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims against TNB and the other financial institutions that are defendants in the action. On July 27, 2016, the court denied the motion by TNB and the other financial institution defendants to dismiss the SAC and also denied the motion by TNB and the other financial institution defendants to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims. On August 24, 2016, TNB filed its answer to the SAC. The second Stanford-related lawsuit was filed on December 14, 2009 in the District Court of Ascension Parish, Louisiana, individually by Harold Jackson, Paul Blaine, Carolyn Bass Smith, Christine Nichols, and Ronald and Ramona Hebert naming TNB (misnamed as Trust National Bank) and other individuals and entities not affiliated with Trustmark as defendants. The complaint seeks to recover the money lost by these individual plaintiffs as a result of the collapse of the Stanford Financial Group (in addition to other damages) under various theories and causes of action, including negligence, breach of contract, breach of fiduciary duty, negligent misrepresentation, detrimental reliance, conspiracy, and violation of Louisiana’s uniform fiduciary, securities, and racketeering laws. The complaint does not quantify the amount of money the plaintiffs seek to recover. In January 2010, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings. On March 29, 2010, the court stayed the case. TNB filed a motion to lift the stay, which was denied on February 28, 2012. In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues. On April 11, 2016, Trustmark learned that a third Stanford-related lawsuit had been filed on April 11, 2016 in the Superior Court of Justice in Ontario, Canada, by The Toronto-Dominion Bank (“TD Bank”), naming TNB and three other financial institutions not affiliated with Trustmark as defendants. The complaint seeks a declaration specifying the degree to which each of TNB and the other defendants are liable in respect of any loss and damage for which TD Bank is found to be liable in a litigation commenced against TD Bank brought by the Joint Liquidators of Stanford International Bank Limited in the Superior Court of Justice, Commercial List in Ontario, Canada (the “Joint Liquidators’ Action”), as well as contribution and indemnity in respect of any judgment, interest and costs TD Bank is ordered to pay in the Joint Liquidators’ Action. To date, TNB has not been served in connection with this action. TNB’s relationship with the Stanford Financial Group began as a result of Trustmark’s acquisition of a Houston-based bank in August 2006, and consisted of correspondent banking and other traditional banking services in the ordinary course of business. All Stanford-related lawsuits are in pre-trial stages. TNB has been named as a defendant in two separately filed but now consolidated lawsuits involving two testamentary trusts created in the will of Kathleen Killebrew Paine for her two children, Carolyn Paine Davis and W.K. Paine. TNB is named as the Trustee in both trusts. The lawsuits were filed on June 30, 2014 in the Chancery Court of the First Judicial District of Hinds County, Mississippi by Jennifer Davis Michael, Elizabeth Paine Lindigrin, Wilmer Harrison Paine, Kenneth Whitworth Paine, Robert Harvey Paine and Nathan Davis, who are all children of Mrs. Davis and Mr. Paine. The complaints allege that the plaintiffs are vested current beneficiaries of the respective trusts; that the plaintiffs should have been entitled to be considered for distributions of trust income; and that the interests of Mrs. Davis and Mr. Paine were favored over plaintiffs’ interest in both the distribution of income and in the making of trust investments. Plaintiffs seek compensatory damages, refund of trust fees and sweep fees, punitive damages, attorneys’ fees and pre- and post-judgment interest. On March 9, 2015, the court granted TNB’s motion to add Mrs. Davis and Mr. W.K. Paine as cross-defendants. Following a bench trial that concluded on January 20, 2016, the judge ordered the parties to enter into mandatory mediation. On February 22, 2016, the mediator reported to the judge that the mediation had failed to resolve the matter. All post-trial briefings have been completed by the parties and submitted to the court. The judge will consider those submissions and then enter a ruling on the case at some point in the future. Trustmark and its subsidiaries are also parties to other lawsuits and other claims that arise in the ordinary course of business. Some of the lawsuits assert claims related to the lending, collection, servicing, investment, trust and other business activities, and some of the lawsuits allege substantial claims for damages. All pending legal proceedings described above are being vigorously contested. In accordance FASB ASC Topic 450-20, “Loss Contingencies,” Trustmark will establish an accrued liability for litigation matters when those matters present loss contingencies that are both probable and reasonably estimable. At the present time, Trustmark believes, based on its evaluation and the advice of legal counsel, that a loss in any such proceeding is not both probable and reasonably estimable.

Earnings Per Share (EPS)

Earnings Per Share (EPS)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share (EPS)	Note 12 – Earnings Per Share (EPS) The following table reflects weighted-average shares used to calculate basic and diluted EPS for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Basic shares 67,625 67,557 67,618 67,547 Dilutive shares 168 150 153 130 Diluted shares 67,793 67,707 67,771 67,677 Weighted-average antidilutive stock awards were excluded in determining diluted EPS. The following table reflects weighted-average antidilutive stock awards for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Weighted-average antidilutive stock awards — 1 2 1

Statements of Cash Flows

Statements of Cash Flows	9 Months Ended
	Sep. 30, 2016
Supplemental Cash Flow Information [Abstract]
Statements of Cash Flows	Note 13 – Statements of Cash Flows The following table reflects specific transaction amounts for the periods presented ($ in thousands): Nine Months Ended September 30, 2016 2015 Income taxes paid $ 24,646 $ 15,291 Interest expense paid on deposits and borrowings 17,132 14,639 Noncash transfers from loans to other real estate (1) 21,972 26,196 (1) Includes transfers from covered loans to covered other real estate.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2016
Stockholders Equity Note [Abstract]
Shareholders' Equity	Note 14 – Shareholders’ Equity Regulatory Capital Trustmark and TNB are subject to minimum risk-based capital and leverage capital requirements, as described in the section captioned “Capital Adequacy” included in Part I. Item 1. – Business of Trustmark’s 2015 Annual Report on Form 10-K, which are administered by the federal bank regulatory agencies. These capital requirements, as defined by federal regulations, involve quantitative and qualitative measures of assets, liabilities and certain off-balance sheet instruments. Effective January 1, 2016, Trustmark’s and TNB’s minimum risk-based capital requirements include the year-one phased in capital conservation buffer of 0.625%. Failure to meet minimum capital requirements can result in certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the financial statements of Trustmark and TNB and limit Trustmark’s and TNB’s ability to pay dividends. As of September 30, 2016, Trustmark and TNB exceeded all applicable minimum capital standards. In addition, Trustmark and TNB met applicable regulatory guidelines to be considered well-capitalized at September 30, 2016. To be categorized in this manner, Trustmark and TNB maintained minimum common equity Tier 1 risk-based capital, Tier 1 risk-based capital, total risk-based capital and Tier 1 leverage ratios as set forth in the accompanying table, and were not subject to any written agreement, order or capital directive, or prompt corrective action directive issued by their primary federal regulators to meet and maintain a specific capital level for any capital measures. There are no significant conditions or events that have occurred since September 30, 2016, which Management believes have affected Trustmark’s or TNB’s present classification. The following table provides Trustmark’s and TNB’s actual regulatory capital amounts and ratios under regulatory capital standards in effect at September 30, 2016 and December 31, 2015 ($ in thousands): Actual Regulatory Capital Minimum To Be Well Amount Ratio Requirement Capitalized At September 30, 2016: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,194,729 12.35 % 5.125 % n/a Trustmark National Bank 1,235,923 12.78 % 5.125 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,254,453 12.97 % 6.625 % n/a Trustmark National Bank 1,235,923 12.78 % 6.625 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,336,704 13.82 % 8.625 % n/a Trustmark National Bank 1,318,174 13.63 % 8.625 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,254,453 9.92 % 4.00 % n/a Trustmark National Bank 1,235,923 9.79 % 4.00 % 5.00 % At December 31, 2015: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,161,598 12.57 % 4.50 % n/a Trustmark National Bank 1,201,113 13.00 % 4.50 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,220,535 13.21 % 6.00 % n/a Trustmark National Bank 1,201,113 13.00 % 6.00 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,300,146 14.07 % 8.00 % n/a Trustmark National Bank 1,280,724 13.86 % 8.00 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,220,535 10.03 % 4.00 % n/a Trustmark National Bank 1,201,113 9.89 % 4.00 % 5.00 % Stock Repurchase Program On March 11, 2016, the Board of Directors of Trustmark authorized a stock repurchase program under which $100.0 million of Trustmark’s outstanding common stock may be acquired through March 31, 2019. The shares may be purchased from time to time at prevailing market prices, through open market or privately negotiated transactions, depending on market conditions. Trustmark did not repurchase any shares of its common stock during the three months ended September 30, 2016. Trustmark repurchased approximately 34 thousand shares of its common stock during the nine months ended September 30, 2016. Other Comprehensive Income and Accumulated Other Comprehensive Loss The following table presents the components of accumulated other comprehensive loss and the related tax effects allocated to each component for the three and nine months ended September 30, 2016 and 2015 ($ in thousands). Reclassification adjustments related to securities available for sale are included in security losses, net in the accompanying consolidated statements of income. The amortization of prior service cost, recognized net loss due to lump sum settlements and change in net actuarial loss on pension and other postretirement benefit plans are included in the computation of net periodic benefit cost (see Note 9 – Defined Benefit and Other Postretirement Benefits for additional details). Reclassification adjustments related to pension and other postretirement benefit plans are included in salaries and employee benefits in the accompanying consolidated statements of income. Reclassification adjustments related to the cash flow hedge derivative are included in other interest expense in the accompanying consolidated statements of income. Three Months Ended September 30, 2016 Three Months Ended September 30, 2015 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Securities available for sale and transferred securities: Unrealized holding (losses) gains arising during the period $ (12,657 ) $ 4,841 $ (7,816 ) $ 17,872 $ (6,837 ) $ 11,035 Reclassification adjustment for net losses realized in net income — — — — — — Change in net unrealized holding loss on securities transferred to held to maturity 2,677 (1,024 ) 1,653 1,678 (642 ) 1,036 Total securities available for sale and transferred securities (9,980 ) 3,817 (6,163 ) 19,550 (7,479 ) 12,071 Pension and other postretirement benefit plans: Net change in prior service costs 63 (24 ) 39 63 (24 ) 39 Recognized net loss due to lump sum settlements 463 (177 ) 286 603 (230 ) 373 Change in net actuarial loss 928 (355 ) 573 1,216 (465 ) 751 Reclassification related to net losses realized in net income 1,454 (556 ) 898 1,882 (719 ) 1,163 Cash flow hedge derivatives: Change in accumulated loss on effective cash flow hedge derivatives 417 (160 ) 257 (1,216 ) 465 (751 ) Reclassification adjustment for loss realized in net income 157 (60 ) 97 211 (81 ) 130 Total cash flow hedge derivatives 574 (220 ) 354 (1,005 ) 384 (621 ) Total other comprehensive (loss) income $ (7,952 ) $ 3,041 $ (4,911 ) $ 20,427 $ (7,814 ) $ 12,613 Nine Months Ended September 30, 2016 Nine Months Ended September 30, 2015 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Securities available for sale and transferred securities: Unrealized holding gains arising during the period $ 32,057 $ (12,261 ) $ 19,796 $ 13,718 $ (5,248 ) $ 8,470 Reclassification adjustment for net losses realized in net income 310 (119 ) 191 — — — Change in net unrealized holding loss on securities transferred to held to maturity 8,374 (3,203 ) 5,171 4,747 (1,816 ) 2,931 Total securities available for sale and transferred securities 40,741 (15,583 ) 25,158 18,465 (7,064 ) 11,401 Pension and other postretirement benefit plans: Net change in prior service costs 188 (72 ) 116 188 (72 ) 116 Recognized net loss due to lump sum settlements 3,134 (1,199 ) 1,935 1,499 (573 ) 926 Change in net actuarial loss 2,684 (1,026 ) 1,658 3,653 (1,397 ) 2,256 Reclassification related to net losses realized in net income 6,006 (2,297 ) 3,709 5,340 (2,042 ) 3,298 Cash flow hedge derivatives: Change in accumulated loss on effective cash flow hedge derivatives (1,360 ) 520 (840 ) (1,919 ) 734 (1,185 ) Reclassification adjustment for loss realized in net income 473 (181 ) 292 632 (242 ) 390 Total cash flow hedge derivatives (887 ) 339 (548 ) (1,287 ) 492 (795 ) Total other comprehensive income $ 45,860 $ (17,541 ) $ 28,319 $ 22,518 $ (8,614 ) $ 13,904 The following table presents the changes in the balances of each component of accumulated other comprehensive loss for the periods presented ($ in thousands). All amounts are presented net of tax. Securities Available and Transferred Securities Defined Benefit Pension Items Cash Flow Hedge Derivatives Total Balance at January 1, 2016 $ (17,394 ) $ (27,840 ) $ (160 ) $ (45,394 ) Other comprehensive income (loss) before reclassification 24,967 — (840 ) 24,127 Amounts reclassified from accumulated other comprehensive loss 191 3,709 292 4,192 Net other comprehensive income (loss) 25,158 3,709 (548 ) 28,319 Balance at September 30, 2016 $ 7,764 $ (24,131 ) $ (708 ) $ (17,075 ) Balance at January 1, 2015 $ (11,003 ) $ (31,617 ) $ 136 $ (42,484 ) Other comprehensive (loss) income before reclassification 11,401 3,298 (1,185 ) 13,514 Amounts reclassified from accumulated other comprehensive loss — — 390 390 Net other comprehensive income (loss) 11,401 3,298 (795 ) 13,904 Balance at September 30, 2015 $ 398 $ (28,319 ) $ (659 ) $ (28,580 )

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value	Note 15 – Fair Value Financial Instruments Measured at Fair Value The methodologies Trustmark uses in determining the fair values are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected upon exchange of the position in an orderly transaction between market participants at the measurement date. The predominant portion of assets that are stated at fair value are of a nature that can be valued using prices or inputs that are readily observable through a variety of independent data providers. The providers selected by Trustmark for fair valuation data are widely recognized and accepted vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. Trustmark has documented and evaluated the pricing methodologies used by the vendors and maintains internal processes that regularly test valuations for anomalies. Trustmark utilizes an independent pricing service to advise it on the carrying value of the securities available for sale portfolio. As part of Trustmark’s procedures, the price provided from the service is evaluated for reasonableness given market changes. When a questionable price exists, Trustmark investigates further to determine if the price is valid. If needed, other market participants may be utilized to determine the correct fair value. Trustmark has also reviewed and confirmed its determinations in thorough discussions with the pricing source regarding their methods of price discovery. Mortgage loan commitments are valued based on the securities prices of similar collateral, term, rate and delivery for which the loan is eligible to deliver in place of the particular security. Trustmark acquires a broad array of mortgage security prices that are supplied by a market data vendor, which in turn accumulates prices from a broad list of securities dealers. Prices are processed through a mortgage pipeline management system that accumulates and segregates all loan commitment and forward-sale transactions according to the similarity of various characteristics (maturity, term, rate, and collateral). Prices are matched to those positions that are deemed to be an eligible substitute or offset ( i.e Trustmark estimates fair value of the MSR through the use of prevailing market participant assumptions and market participant valuation processes. This valuation is periodically tested and validated against other third-party firm valuations. Trustmark obtains the fair value of interest rate swaps from a third-party pricing service that uses an industry standard discounted cash flow methodology. In addition, credit valuation adjustments are incorporated in the fair values to account for potential nonperformance risk. In adjusting the fair value of its interest rate swap contracts for the effect of nonperformance risk, Trustmark has considered any applicable credit enhancements such as collateral postings, thresholds, mutual puts, and guarantees. In conjunction with the FASB’s fair value measurement guidance, Trustmark made an accounting policy election to measure the credit risk of these derivative financial instruments, which are subject to master netting agreements, on a net basis by counterparty portfolio. Trustmark has determined that the majority of the inputs used to value its interest rate swaps offered to qualified commercial borrowers fall within Level 2 of the fair value hierarchy, while the credit valuation adjustments associated with these derivatives utilize Level 3 inputs, such as estimates of current credit spreads. Trustmark has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its interest rate swaps and has determined that the credit valuation adjustment is not significant to the overall valuation of these derivatives. As a result, Trustmark classifies its interest rate swap valuations in Level 2 of the fair value hierarchy. Trustmark also utilizes exchange-traded derivative instruments such as Treasury note futures contracts and option contracts to achieve a fair value return that offsets the changes in fair value of the MSR attributable to interest rates. Fair values of these derivative instruments are determined from quoted prices in active markets for identical assets therefore allowing them to be classified within Level 1 of the fair value hierarchy. In addition, Trustmark utilizes derivative instruments such as interest rate lock commitments in its mortgage banking area which lack observable inputs for valuation purposes resulting in their inclusion in Level 3 of the fair value hierarchy. At this time, Trustmark presents no fair values that are derived through internal modeling. Should positions requiring fair valuation arise that are not relevant to existing methodologies, Trustmark will make every reasonable effort to obtain market participant assumptions, or independent evaluation. Financial Assets and Liabilities The following tables summarize financial assets and financial liabilities measured at fair value on a recurring basis as of September 30, 2016 and December 31, 2015, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value ($ in thousands). There were no transfers between fair value levels for the nine months ended September 30, 2016 and the year ended December 31, 2015. September 30, 2016 Total Level 1 Level 2 Level 3 U.S. Government agency obligations $ 58,517 $ — $ 58,517 $ — Obligations of states and political subdivisions 124,641 — 124,641 — Mortgage-backed securities 2,227,789 — 2,227,789 — Securities available for sale 2,410,947 — 2,410,947 — Loans held for sale 242,097 — 242,097 — Mortgage servicing rights 65,514 — — 65,514 Other assets - derivatives 7,901 (25 ) 5,179 2,747 Other liabilities - derivatives 8,583 808 7,775 — December 31, 2015 Total Level 1 Level 2 Level 3 U.S. Government agency obligations $ 68,416 $ — $ 68,416 $ — Obligations of states and political subdivisions 138,609 — 138,609 — Mortgage-backed securities 2,113,440 — 2,113,440 — Asset-backed securities and structured financial products 24,957 — 24,957 — Securities available for sale 2,345,422 — 2,345,422 — Loans held for sale 160,189 — 160,189 — Mortgage servicing rights 74,007 — — 74,007 Other assets - derivatives 3,611 (149 ) 2,647 1,113 Other liabilities - derivatives 3,929 1,220 2,709 — The changes in Level 3 assets measured at fair value on a recurring basis for the nine months ended September 30, 2016 and 2015 are summarized as follows ($ in thousands): MSR Other Assets - Derivatives Balance, January 1, 2016 $ 74,007 $ 1,113 Total net (loss) gain included in Mortgage banking, net (1) (20,885 ) 9,486 Additions 12,392 — Sales — (7,852 ) Balance, September 30, 2016 $ 65,514 $ 2,747 The amount of total (losses) gains for the period included in earnings that are attributable to the change in unrealized gains or losses still held at September 30, 2016 $ (13,519 ) $ 904 Balance, January 1, 2015 $ 64,358 $ 1,299 Total net (loss) gain included in Mortgage banking, net (1) (7,869 ) 6,193 Additions 13,320 — Sales — (4,786 ) Balance, September 30, 2015 $ 69,809 $ 2,706 The amount of total losses for the period included in earnings that are attributable to the change in unrealized gains or losses still held at September 30, 2015 $ (433 ) $ (169 ) (1) Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off. Trustmark may be required, from time to time, to measure certain assets at fair value on a nonrecurring basis in accordance with GAAP. Assets at September 30, 2016, which have been measured at fair value on a nonrecurring basis, include impaired LHFI. Loans for which it is probable Trustmark will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement are considered impaired. Specific allowances for impaired LHFI are based on comparisons of the recorded carrying values of the loans to the present value of the estimated cash flows of these loans at each loan’s original effective interest rate, the fair value of the collateral or the observable market prices of the loans. Impaired LHFI are primarily collateral dependent loans and are assessed using a fair value approach. Fair value estimates for collateral dependent loans are derived from appraised values based on the current market value or as-is value of the property being appraised, normally from recently received and reviewed appraisals. Appraisals are obtained from state-certified appraisers and are based on certain assumptions, which may include construction or development status and the highest and best use of the property. These appraisals are reviewed by Trustmark’s Appraisal Review Department to ensure they are acceptable. Appraised values are adjusted down for costs associated with asset disposal. At September 30, 2016, Trustmark had outstanding balances of $28.6 million in impaired LHFI that were specifically identified for evaluation and written down to the fair value of the underlying collateral less cost to sell based on the fair value of the collateral or other unobservable input compared to $26.5 million at December 31, 2015. These specifically evaluated impaired LHFI are classified as Level 3 in the fair value hierarchy. Impaired LHFI are periodically reviewed and evaluated for additional impairment and adjusted accordingly based on the same factors identified above. Nonfinancial Assets and Liabilities Certain nonfinancial assets measured at fair value on a nonrecurring basis include foreclosed assets (upon initial recognition or subsequent impairment), nonfinancial assets and nonfinancial liabilities measured at fair value in the second step of a goodwill impairment test, and intangible assets and other nonfinancial long-lived assets measured at fair value for impairment assessment. Other real estate, excluding covered other real estate, includes assets that have been acquired in satisfaction of debt through foreclosure and is recorded at the lower of cost or estimated fair value. Fair value is based on independent appraisals and other relevant factors. In the determination of fair value subsequent to foreclosure, Management also considers other factors or recent developments, such as changes in market conditions from the time of valuation and anticipated sales values considering plans for disposition, which could result in an adjustment to lower the collateral value estimates indicated in the appraisals. At September 30, 2016, Trustmark’s geographic other real estate distribution was concentrated primarily in its five key market regions: Alabama, Florida, Mississippi, Tennessee and Texas. The ultimate recovery of a substantial portion of the carrying amount of other real estate, excluding covered other real estate, is susceptible to changes in market conditions in these areas. Periodic revaluations are classified as Level 3 in the fair value hierarchy since assumptions are used that may not be observable in the market. Certain foreclosed assets, upon initial recognition, are remeasured and reported at fair value through a charge-off to the allowance for loan losses based upon the fair value of the foreclosed asset. The fair value of a foreclosed asset, upon initial recognition, is estimated using Level 3 inputs based on adjusted observable market data. Foreclosed assets measured at fair value upon initial recognition totaled $22.0 million (utilizing Level 3 valuation inputs) during the nine months ended September 30, 2016 compared with $26.8 million for the same period in 2015. In connection with the measurement and initial recognition of the foregoing foreclosed assets, Trustmark recognized charge-offs of the allowance for loan losses totaling $19.8 million and $7.4 million for the first nine months of 2016 and 2015, respectively. Other than foreclosed assets measured at fair value upon initial recognition, $26.5 million of foreclosed assets were remeasured during the first nine months of 2016, requiring write-downs of $3.7 million to reach their current fair values compared to $39.4 million of foreclosed assets that were remeasured during the first nine months of 2015, requiring write-downs of $2.4 million. Fair Value of Financial Instruments FASB ASC Topic 825, “Financial Instruments,” requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. A detailed description of the valuation methodologies used in estimating the fair value of financial instruments can be found in Note 19 – Fair Value included in Item 8 of Trustmark’s Annual Report on Form 10-K for the year ended December 31, 2015. The carrying amounts and estimated fair values of financial instruments at September 30, 2016 and December 31, 2015, are as follows ($ in thousands): September 30, 2016 December 31, 2015 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial Assets: Level 2 Inputs: Cash and short-term investments $ 384,445 $ 384,445 $ 278,001 $ 278,001 Securities held to maturity 1,143,234 1,173,101 1,187,818 1,195,367 Level 3 Inputs: Net LHFI 7,428,333 7,493,082 7,023,766 7,136,105 Net acquired loans 284,357 284,357 378,419 378,419 FDIC indemnification asset — — 738 738 Financial Liabilities: Level 2 Inputs: Deposits 9,685,701 9,689,282 9,588,230 9,592,531 Short-term liabilities 927,710 927,710 853,659 853,659 Long-term FHLB advances 751,075 751,077 501,155 501,160 Subordinated notes 49,993 50,484 49,969 51,405 Junior subordinated debt securities 61,856 40,825 61,856 49,021 In cases where quoted market prices are not available, fair values are generally based on estimates using present value techniques. Trustmark’s premise in present value techniques is to represent the fair values on a basis of replacement value of the existing instrument given observed market rates on the measurement date. These techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. In that regard, the derived fair value estimates for those assets or liabilities cannot necessarily be substantiated by comparison to independent markets and, in many cases, may not be realizable in immediate settlement of the instruments. The estimated fair value of financial instruments with immediate and shorter-term maturities (generally 90 days or less) is assumed to be the same as the recorded book value. All nonfinancial instruments, by definition, have been excluded from these disclosure requirements. Accordingly, the aggregate fair value amounts presented do not represent the underlying value of Trustmark. The fair values of net LHFI are estimated for portfolios of loans with similar financial characteristics. For variable rate LHFI that reprice frequently with no significant change in credit risk, fair values are based on carrying values. The fair values of certain mortgage LHFI, such as 1-4 family residential properties, are based on quoted market prices of similar loans sold in conjunction with securitization transactions, adjusted for differences in loan characteristics. The fair values of other types of LHFI are estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities. The processes for estimating the fair value of net LHFI described above does not represent an exit price under FASB ASC Topic 820, “Fair Value Measurements and Disclosures,” and such an exit price could potentially produce a different fair value estimate at September 30, 2016 and December 31, 2015. Fair Value Option Trustmark has elected to account for its mortgage LHFS purchased or originated on or after October 1, 2014 under the fair value option, with interest income on these mortgage LHFS reported in interest and fees on LHFS and LHFI. The fair value of the mortgage LHFS is determined using quoted prices for a similar asset, adjusted for specific attributes of that loan. The mortgage LHFS are actively managed and monitored and certain market risks of the loans may be mitigated through the use of derivatives. These derivative instruments are carried at fair value with changes in fair value recorded in noninterest income in mortgage banking, net. The changes in the fair value of the LHFS are largely offset by changes in the fair value of the derivative instruments. For the three and nine months ended September 30, 2016, a net loss of $1.1 million and a net gain of $2.6 million, respectively, was recorded in noninterest income in mortgage banking, net for changes in the fair value of the LHFS accounted for under the fair value option, compared to a net gain of $3.6 million and $1.7 million for the three and nine months ended September 30, 2015, respectively. Interest and fees on LHFS and LHFI for the three and nine months ended September 30, 2016 included $1.5 million and $3.7 million, respectively, of interest earned on the LHFS accounted for under the fair value option, compared to $1.4 million and $3.7 million for the same time periods in 2015. Election of the fair value option allows Trustmark to reduce the accounting volatility that would otherwise result from the asymmetry created by accounting for the financial instruments at the lower of cost or fair value and the derivatives at fair value. The fair value option election does not apply to the GNMA optional repurchase loans which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option. GNMA optional repurchase loans totaled $37.3 million and $36.0 million at September 30, 2016 and December 31, 2015, respectively, and are included in LHFS on the accompanying consolidated balance sheets. The following table provides information about the fair value and the contractual principal outstanding of the LHFS accounted for under the fair value option as of September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 December 31, 2015 Fair value of LHFS $ 204,839 $ 124,165 LHFS contractual principal outstanding 198,288 121,608 Fair value less unpaid principal $ 6,551 $ 2,557

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 16 – Derivative Financial Instruments Derivatives Designated as Hedging Instruments On April 4, 2013, Trustmark entered into a forward interest rate swap contract on junior subordinated debentures with a total notional amount of $60.0 million. The interest rate swap contract was designated as a derivative instrument in a cash flow hedge under FASB ASC Topic 815, “Derivatives and Hedging,” with the objective of protecting the quarterly interest payments on Trustmark’s $60.0 million of junior subordinated debentures issued to Trustmark Preferred Capital Trust I throughout the five-year period beginning December 31, 2014 and ending December 31, 2019 from the risk of variability of those payments resulting from changes in the three-month LIBOR interest rate. Under the swap, which became effective on December 31, 2014, Trustmark will pay a fixed interest rate of 1.66% and receive a variable interest rate based on three-month LIBOR on a total notional amount of $60.0 million, with quarterly net settlements. No ineffectiveness related to the interest rate swap designated as a cash flow hedge was recognized in the consolidated statements of income for the nine months ended September 30, 2016 and 2015. The accumulated net after-tax loss related to the effective cash flow hedge included in accumulated other comprehensive loss totaled $708 thousand and $160 thousand at September 30, 2016 and December 31, 2015, respectively. Amounts reported in accumulated other comprehensive loss related to this derivative are reclassified to other interest expense as interest payments are made on Trustmark’s variable rate junior subordinated debentures. During the next twelve months, Trustmark estimates that $442 thousand will be reclassified as an increase to other interest expense. Derivatives not Designated as Hedging Instruments Trustmark utilizes a portfolio of exchange-traded derivative instruments, such as Treasury note futures contracts and option contracts, to achieve a fair value return that economically hedges changes in the fair value of the MSR attributable to interest rates. These transactions are considered freestanding derivatives that do not otherwise qualify for hedge accounting. The total notional amount of these derivative instruments were $338.5 million at September 30, 2016 compared to $264.5 million at December 31, 2015. Changes in the fair value of these exchange-traded derivative instruments are recorded in noninterest income in mortgage banking, net and are offset by changes in the fair value of the MSR. The impact of this strategy resulted in a net negative ineffectiveness of $1.2 million compared to a net positive ineffectiveness of $479 thousand for the three months ended September 30, 2016 and 2015, respectively. For the nine months ended September 30, 2016 and 2015, the impact was a net negative ineffectiveness of $2.7 million compared to a net positive ineffectiveness of $3.9 million, respectively. As part of Trustmark’s risk management strategy in the mortgage banking area, derivative instruments such as forward sales contracts are utilized. Trustmark’s obligations under forward sales contracts consist of commitments to deliver mortgage loans, originated and/or purchased, in the secondary market at a future date. Changes in the fair value of these derivative instruments are recorded in noninterest income in mortgage banking, net and are offset by changes in the fair value of LHFS. Trustmark’s off-balance sheet obligations under these derivative instruments totaled $301.5 million at September 30, 2016, with a negative valuation adjustment of $1.2 million, compared to $190.5 million, with a positive valuation adjustment of $262 thousand as of December 31, 2015. Trustmark also utilizes derivative instruments such as interest rate lock commitments in its mortgage banking area. Interest rate lock commitments are residential mortgage loan commitments with customers, which guarantee a specified interest rate for a specified time period. Changes in the fair value of these derivative instruments are recorded in noninterest income in mortgage banking, net and are offset by the changes in the fair value of forward sales contracts. Trustmark’s off-balance sheet obligations under these derivative instruments totaled $195.7 million at September 30, 2016, with a positive valuation adjustment of $2.7 million, compared to $108.1 million, with a positive valuation adjustment of $1.1 million as of December 31, 2015. Trustmark offers certain derivatives products directly to qualified commercial lending clients seeking to manage their interest rate risk. Trustmark economically hedges interest rate swap transactions executed with commercial lending clients by entering into offsetting interest rate swap transactions with institutional derivatives market participants. Derivatives transactions executed as part of this program are not designated as qualifying hedging relationships and are, therefore, carried at fair value with the change in fair value recorded in noninterest income in bank card and other fees. Because these derivatives have mirror-image contractual terms, in addition to collateral provisions which mitigate the impact of non-performance risk, the changes in fair value are expected to substantially offset. As of September 30, 2016, Trustmark had interest rate swaps with an aggregate notional amount of $350.3 million related to this program, compared to $359.3 million as of December 31, 2015. Credit-risk-related Contingent Features Trustmark has agreements with its financial institution counterparties that contain provisions where if Trustmark defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then Trustmark could also be declared in default on its derivatives obligations. As of September 30, 2016 and December 31, 2015, the termination value of interest rate swaps in a liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $5.9 million and $2.6 million, respectively. As of September 30, 2016, Trustmark had posted collateral of $5.8 million against its obligations because of negotiated thresholds and minimum transfer amounts under these agreements. If Trustmark had breached any of these triggering provisions at September 30, 2016, it could have been required to settle its obligations under the agreements at the termination value. Credit risk participation agreements arise when Trustmark contracts with other financial institutions, as a guarantor or beneficiary, 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. At both September 30, 2016 and December 31, 2015, Trustmark had entered into two risk participation agreements as a beneficiary with an aggregate notional amount of $14.3 million and $14.8 million, respectively. At September 30, 2016, Trustmark had entered into five risk participation agreements as a guarantor with an aggregate notional amount of $28.6 million compared to one risk participation agreement as a guarantor with an aggregate notional amount of $5.9 million at December 31, 2015. The aggregate fair values of these risk participation agreements were immaterial at September 30, 2016 and December 31, 2015. Tabular Disclosures The following tables disclose the fair value of derivative instruments in Trustmark’s balance sheets as of September 30, 2016 and December 31, 2015 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands): September 30, 2016 December 31, 2015 Derivatives in hedging relationships Interest rate contracts: Interest rate swaps included in other assets $ (1,147 ) $ (259 ) Derivatives not designated as hedging instruments Interest rate contracts: Futures contracts included in other assets $ (199 ) $ (207 ) Exchange traded purchased options included in other assets 174 58 OTC written options (rate locks) included in other assets 2,747 1,113 Interest rate swaps included in other assets 6,298 2,888 Credit risk participation agreements included in other assets 28 18 Forward contracts included in other liabilities 1,170 (262 ) Exchange traded written options included in other liabilities 808 1,220 Interest rate swaps included in other liabilities 6,570 2,954 Credit risk participation agreements included in other liabilities 35 17 Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Derivatives in hedging relationships Amount of loss reclassified from accumulated other comprehensive loss and recognized in other interest expense $ (157 ) $ (211 ) $ (473 ) $ (632 ) Derivatives not designated as hedging instruments Amount of (loss) gain recognized in mortgage banking, net $ (688 ) $ 1,265 $ 11,042 $ 4,221 Amount of gain (loss) recognized in bank card and other fees 1 (128 ) (206 ) (94 ) The following table discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Derivatives in cash flow hedging relationship Amount of gain (loss) recognized in other comprehensive income (loss), net of tax $ 257 $ (751 ) $ (840 ) $ (1,185 ) Trustmark’s interest rate swap derivative instruments are subject to master netting agreements, and therefore, eligible for offsetting in the consolidated balance sheet. Trustmark has elected to not offset any derivative instruments in its consolidated balance sheets. Information about financial instruments that are eligible for offset in the consolidated balance sheets as of September 30, 2016 and December 31, 2015 is presented in the following tables ($ in thousands): Offsetting of Derivative Assets As of September 30, 2016 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Derivatives $ 5,151 $ — $ 5,151 $ — $ — $ 5,151 Offsetting of Derivative Liabilities As of September 30, 2016 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities presented in the Statement of Financial Position Financial Instruments Cash Collateral Posted Net Amount Derivatives $ 6,570 $ — $ 6,570 $ — $ (4,932 ) $ 1,638 Offsetting of Derivative Assets As of December 31, 2015 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Derivatives $ 2,629 $ — $ 2,629 $ — $ — $ 2,629 Offsetting of Derivative Liabilities As of December 31, 2015 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities presented in the Statement of Financial Position Financial Instruments Cash Collateral Posted Net Amount Derivatives $ 2,954 $ — $ 2,954 $ — $ (1,195 ) $ 1,759

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Segment Information	Note 17 – Segment Information Trustmark’s management reporting structure includes three segments: General Banking, Wealth Management and Insurance. For a complete overview of Trustmark’s operating segments, see Note 21 – Segment Information included in Part II. Item 8. – Financial Statements and Supplementary Data, of Trustmark’s 2015 Annual Report on Form 10-K. There have been no significant changes in Trustmark’s operating segments during the periods presented. The accounting policies of each reportable segment are the same as those of Trustmark except for its internal allocations. Noninterest expenses for back-office operations support are allocated to segments based on estimated uses of those services. Trustmark measures the net interest income of its business segments with a process that assigns cost of funds or earnings credit on a matched-term basis. This process, called “funds transfer pricing”, charges an appropriate cost of funds to assets held by a business unit, or credits the business unit for potential earnings for carrying liabilities. The net of these charges and credits flows through to the General Banking segment, which contains the management team responsible for determining TNB’s funding and interest rate risk strategies. The following table discloses financial information by reportable segment for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 General Banking Net interest income $ 97,395 $ 97,408 $ 287,950 $ 291,483 Provision for loan losses, net 4,975 3,770 11,730 7,760 Noninterest income 27,207 28,320 81,230 82,477 Noninterest expense 84,358 90,043 267,063 262,403 Income before income taxes 35,269 31,915 90,387 103,797 Income taxes 6,844 6,207 18,168 22,588 General banking net income $ 28,425 $ 25,708 $ 72,219 $ 81,209 Selected Financial Information Average assets $ 12,916,011 $ 12,231,450 $ 12,788,736 $ 12,123,213 Depreciation and amortization $ 9,274 $ 9,209 $ 26,483 $ 27,256 Wealth Management Net interest income $ 119 $ 91 $ 571 $ 194 Noninterest income 7,434 7,748 22,681 23,477 Noninterest expense 6,216 6,195 18,200 19,373 Income before income taxes 1,337 1,644 5,052 4,298 Income taxes 512 629 1,933 1,644 Wealth management net income $ 825 $ 1,015 $ 3,119 $ 2,654 Selected Financial Information Average assets $ 6,039 $ 4,181 $ 1,842 $ 3,020 Depreciation and amortization $ 44 $ 44 $ 131 $ 139 Insurance Net interest income $ 50 $ 107 $ 160 $ 270 Noninterest income 10,075 9,905 28,308 27,925 Noninterest expense 7,334 7,322 21,768 21,266 Income before income taxes 2,791 2,690 6,700 6,929 Income taxes 1,059 983 2,550 2,612 Insurance net income $ 1,732 $ 1,707 $ 4,150 $ 4,317 Selected Financial Information Average assets $ 78,167 $ 78,146 $ 63,652 $ 58,570 Depreciation and amortization $ 186 $ 213 $ 569 $ 600 Consolidated Net interest income $ 97,564 $ 97,606 $ 288,681 $ 291,947 Provision for loan losses, net 4,975 3,770 11,730 7,760 Noninterest income 44,716 45,973 132,219 133,879 Noninterest expense 97,908 103,560 307,031 303,042 Income before income taxes 39,397 36,249 102,139 115,024 Income taxes 8,415 7,819 22,651 26,844 Consolidated net income $ 30,982 $ 28,430 $ 79,488 $ 88,180 Selected Financial Information Average assets $ 13,000,217 $ 12,313,777 $ 12,854,230 $ 12,184,803 Depreciation and amortization $ 9,504 $ 9,466 $ 27,183 $ 27,995

Accounting Policies Recently Ad

Accounting Policies Recently Adopted and Pending Accounting Pronouncements	9 Months Ended
	Sep. 30, 2016
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
Accounting Policies Recently Adopted and Pending Accounting Pronouncements	Note 18 – Accounting Policies Recently Adopted and Pending Accounting Pronouncements ASU 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” Issued in August 2016, ASU 2016-15 provides guidance to reduce the diversity in practice of how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments of ASU 2016-15 are effective for interim and annual periods beginning after December 15, 2017. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-15 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” Issued in June 2016, ASU 2016-13 will add FASB ASC Topic 326, “Financial Instruments-Credit Losses” and finalizes amendments to FASB ASC Subtopic 825-15, “Financial Instruments-Credit Losses .” The amendments of ASU 2016-13 are intended to provide financial statement users with more decision-useful information related to expected credit losses on financial instruments and other commitments to extend credit by replacing the current incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. The amendments of ASU 2016-13 eliminate the probable initial recognition threshold and, in turn, reflect an entity’s current estimate of all expected credit losses. ASU 2016-13 does not specify the method for measuring expected credit losses, and an entity is allowed to apply methods that reasonably reflect its expectations of the credit loss estimate. Additionally, the amendments of ASU 2016-13 require that credit losses on available for sale debt securities be presented as an allowance rather than as a write-down. The amendments of ASU 2016-13 are effective for interim and annual periods beginning after December 15, 2019. Earlier application is permitted for interim and annual periods beginning after December 15, 2018. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements. ASU 2016-09, “Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” Issued in March 2016, ASU 2016-09 seeks to reduce complexity in accounting standards by simplifying several aspects of the accounting for share-based payment transactions, including (1) accounting for income taxes; (2) classification of excess tax benefits on the statement of cash flow; (3) forfeitures; (4) minimum statutory tax withholding requirements; (5) classification of employee taxes paid on the statement of cash flows when an employer withholds shares for tax withholding purposes; (6) the practical expedient for estimating the expected term; and (7) intrinsic value. The amendments of ASU 2016-09 are effective for interim and annual periods beginning after December 15, 2016. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-09 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-07, “Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting.” Issued in March 2016, ASU 2016-07 affects all entities that have an investment that becomes qualified for the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence. ASU 2016-07 simplifies the transition to the equity method of accounting by eliminating the retroactive adjustment of the investment when an investment qualifies for use of the equity method, among other things. The amendments of ASU 2016-07 are effective for interim and annual periods beginning after December 15, 2016. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-07 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-05, “Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships.” Issued in March 2016, ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument under ASC Topic 815 does not, in and of itself, require de-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The amendments of ASU 2016-05 are effective for interim and annual periods beginning after December 15, 2016. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-05 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-02, “Leases (Topic 842).” Issued in February 2016, ASU 2016-02 was issued by the FASB to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and by disclosing key information about leasing arrangements. ASU 2016-02 will, among other things, require lessees to recognize a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. ASU 2016-02 does not significantly change lease accounting requirements applicable to lessors; however, the ASU contains some targeted improvements that are intended to align, where necessary, lessor accounting with the lessee accounting model and with the updated revenue recognition guidance issued in 2014. The amendments of ASU 2016-02 are effective for interim and annual periods beginning after December 15, 2018. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-02 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-01, “Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (An Amendment of the FASB Accounting Standards Codification).” Issued in January 2016, ASU 2016-01 is intended to enhance the reporting model for financial instruments to provide users of financial statements with improved decision-making information. The amendments of ASU 2016-01 include: (i) requiring equity investments, except those accounted for under the equity method of accounting or those that result in the consolidation of an investee, to be measured at fair value with changes in fair value recognized in net income; (ii) requiring a qualitative assessment to identify impairment of equity investments without readily determinable fair values; and (iii) clarifying that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity’s other deferred tax assets. The amendments of ASU 2016-01 are effective for interim and annual periods beginning after December 15, 2017. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-01 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” Issued in May 2014, ASU 2014-09 will add FASB ASC Topic 606, “Revenue from Contracts with Customers,” and will supersede revenue recognition requirements in FASB ASC Topic 605, “Revenue Recognition,” as well as certain cost guidance in FASB ASC Topic 605-35, “Revenue Recognition – Construction-Type and Production-Type Contracts.” ASU 2014-09 provides a framework for revenue recognition that replaces the existing industry and transaction specific requirements under the existing standards. ASU 2014-09 requires an entity to apply a five-step model to determine when to recognize revenue and at what amount. The model specifies that revenue should be recognized when (or as) an entity transfers control of goods or services to a customer at the amount in which the entity expects to be entitled. Depending on whether certain criteria are met, revenue should be recognized either over time, in a manner that depicts the entity’s performance, or at a point in time, when control of the goods or services are transferred to the customer. ASU 2014-09 provides that an entity should apply the following steps: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the entity satisfies a performance obligation. In addition, the existing requirements for the recognition of a gain or loss on the transfer of non-financial assets that are not in a contract with a customer are amended to be consistent with the guidance on recognition and measurement in ASU 2014-09. The amendments of ASU 2014-09 may be applied either retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application. If the transition method of application is elected, the entity should also provide the additional disclosures in reporting periods that include the date of initial application of (1) the amount by which each financial statement line item is affected in the current reporting period, as compared to the guidance that was in effect before the change, and (2) an explanation of the reasons for significant changes. ASU 2015-14, issued in August 2015, defers the effective date of ASU 2014-09 by one year. ASU 2015-14 provides that the amendments of ASU 2014-09 become effective for interim and annual periods beginning after December 15, 2017. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. All subsequently issued ASUs which provide additional guidance and clarifications to various aspects of FASB ASC Topic 606 will become effective when the amendments of ASU 2014-09 become effective. Management is currently evaluating the impact ASU 2014-09 will have on Trustmark’s consolidated financial statements as well as the most appropriate method of application; however, regardless of the method of application selected, the adoption of ASU 2014-09 is not expected to have a material impact on Trustmark’s consolidated financial statements.

Accounting Policies Recently 26

Accounting Policies Recently Adopted and Pending Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Accounting Policies Recently Adopted and Pending Accounting Pronouncements	ASU 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” Issued in August 2016, ASU 2016-15 provides guidance to reduce the diversity in practice of how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments of ASU 2016-15 are effective for interim and annual periods beginning after December 15, 2017. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-15 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” Issued in June 2016, ASU 2016-13 will add FASB ASC Topic 326, “Financial Instruments-Credit Losses” and finalizes amendments to FASB ASC Subtopic 825-15, “Financial Instruments-Credit Losses .” The amendments of ASU 2016-13 are intended to provide financial statement users with more decision-useful information related to expected credit losses on financial instruments and other commitments to extend credit by replacing the current incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. The amendments of ASU 2016-13 eliminate the probable initial recognition threshold and, in turn, reflect an entity’s current estimate of all expected credit losses. ASU 2016-13 does not specify the method for measuring expected credit losses, and an entity is allowed to apply methods that reasonably reflect its expectations of the credit loss estimate. Additionally, the amendments of ASU 2016-13 require that credit losses on available for sale debt securities be presented as an allowance rather than as a write-down. The amendments of ASU 2016-13 are effective for interim and annual periods beginning after December 15, 2019. Earlier application is permitted for interim and annual periods beginning after December 15, 2018. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements. ASU 2016-09, “Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” Issued in March 2016, ASU 2016-09 seeks to reduce complexity in accounting standards by simplifying several aspects of the accounting for share-based payment transactions, including (1) accounting for income taxes; (2) classification of excess tax benefits on the statement of cash flow; (3) forfeitures; (4) minimum statutory tax withholding requirements; (5) classification of employee taxes paid on the statement of cash flows when an employer withholds shares for tax withholding purposes; (6) the practical expedient for estimating the expected term; and (7) intrinsic value. The amendments of ASU 2016-09 are effective for interim and annual periods beginning after December 15, 2016. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-09 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-07, “Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting.” Issued in March 2016, ASU 2016-07 affects all entities that have an investment that becomes qualified for the equity method of accounting as a result of an increase in the level of ownership interest or degree of influence. ASU 2016-07 simplifies the transition to the equity method of accounting by eliminating the retroactive adjustment of the investment when an investment qualifies for use of the equity method, among other things. The amendments of ASU 2016-07 are effective for interim and annual periods beginning after December 15, 2016. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-07 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-05, “Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships.” Issued in March 2016, ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument under ASC Topic 815 does not, in and of itself, require de-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The amendments of ASU 2016-05 are effective for interim and annual periods beginning after December 15, 2016. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-05 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-02, “Leases (Topic 842).” Issued in February 2016, ASU 2016-02 was issued by the FASB to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and by disclosing key information about leasing arrangements. ASU 2016-02 will, among other things, require lessees to recognize a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. ASU 2016-02 does not significantly change lease accounting requirements applicable to lessors; however, the ASU contains some targeted improvements that are intended to align, where necessary, lessor accounting with the lessee accounting model and with the updated revenue recognition guidance issued in 2014. The amendments of ASU 2016-02 are effective for interim and annual periods beginning after December 15, 2018. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-02 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2016-01, “Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities (An Amendment of the FASB Accounting Standards Codification).” Issued in January 2016, ASU 2016-01 is intended to enhance the reporting model for financial instruments to provide users of financial statements with improved decision-making information. The amendments of ASU 2016-01 include: (i) requiring equity investments, except those accounted for under the equity method of accounting or those that result in the consolidation of an investee, to be measured at fair value with changes in fair value recognized in net income; (ii) requiring a qualitative assessment to identify impairment of equity investments without readily determinable fair values; and (iii) clarifying that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the entity’s other deferred tax assets. The amendments of ASU 2016-01 are effective for interim and annual periods beginning after December 15, 2017. Management is currently evaluating the impact this ASU will have on Trustmark’s consolidated financial statements; however, the adoption of ASU 2016-01 is not expected to have a material impact on Trustmark’s consolidated financial statements. ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” Issued in May 2014, ASU 2014-09 will add FASB ASC Topic 606, “Revenue from Contracts with Customers,” and will supersede revenue recognition requirements in FASB ASC Topic 605, “Revenue Recognition,” as well as certain cost guidance in FASB ASC Topic 605-35, “Revenue Recognition – Construction-Type and Production-Type Contracts.” ASU 2014-09 provides a framework for revenue recognition that replaces the existing industry and transaction specific requirements under the existing standards. ASU 2014-09 requires an entity to apply a five-step model to determine when to recognize revenue and at what amount. The model specifies that revenue should be recognized when (or as) an entity transfers control of goods or services to a customer at the amount in which the entity expects to be entitled. Depending on whether certain criteria are met, revenue should be recognized either over time, in a manner that depicts the entity’s performance, or at a point in time, when control of the goods or services are transferred to the customer. ASU 2014-09 provides that an entity should apply the following steps: (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the entity satisfies a performance obligation. In addition, the existing requirements for the recognition of a gain or loss on the transfer of non-financial assets that are not in a contract with a customer are amended to be consistent with the guidance on recognition and measurement in ASU 2014-09. The amendments of ASU 2014-09 may be applied either retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying ASU 2014-09 recognized at the date of initial application. If the transition method of application is elected, the entity should also provide the additional disclosures in reporting periods that include the date of initial application of (1) the amount by which each financial statement line item is affected in the current reporting period, as compared to the guidance that was in effect before the change, and (2) an explanation of the reasons for significant changes. ASU 2015-14, issued in August 2015, defers the effective date of ASU 2014-09 by one year. ASU 2015-14 provides that the amendments of ASU 2014-09 become effective for interim and annual periods beginning after December 15, 2017. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. All subsequently issued ASUs which provide additional guidance and clarifications to various aspects of FASB ASC Topic 606 will become effective when the amendments of ASU 2014-09 become effective. Management is currently evaluating the impact ASU 2014-09 will have on Trustmark’s consolidated financial statements as well as the most appropriate method of application; however, regardless of the method of application selected, the adoption of ASU 2014-09 is not expected to have a material impact on Trustmark’s consolidated financial statements.

Securities Available for Sale27

Securities Available for Sale and Held to Maturity (Tables)	9 Months Ended
	Sep. 30, 2016
Investments Debt And Equity Securities [Abstract]
Amortized Cost and Estimated Fair Value of Available for Sale and Held to Maturity Securities	The following tables are a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at September 30, 2016 and December 31, 2015 ($ in thousands): Securities Available for Sale Securities Held to Maturity September 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value U.S. Government agency obligations Issued by U.S. Government agencies $ 58,259 $ 482 $ (507 ) $ 58,234 $ — $ — $ — $ — Issued by U.S. Government sponsored agencies 257 26 — 283 3,636 337 — 3,973 Obligations of states and political subdivisions 121,485 3,167 (11 ) 124,641 52,937 2,615 (4 ) 55,548 Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 36,130 712 (54 ) 36,788 16,183 666 — 16,849 Issued by FNMA and FHLMC 554,916 7,239 (166 ) 561,989 39,989 810 — 40,799 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 1,353,984 21,507 (1,092 ) 1,374,399 831,662 18,690 (60 ) 850,292 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 247,689 6,945 (21 ) 254,613 198,827 6,921 (108 ) 205,640 Total $ 2,372,720 $ 40,078 $ (1,851 ) $ 2,410,947 $ 1,143,234 $ 30,039 $ (172 ) $ 1,173,101 December 31, 2015 U.S. Government agency obligations Issued by U.S. Government agencies $ 68,314 $ 555 $ (734 ) $ 68,135 $ — $ — $ — $ — Issued by U.S. Government sponsored agencies 258 23 — 281 101,782 3,282 — 105,064 Obligations of states and political subdivisions 134,719 3,922 (32 ) 138,609 55,892 2,918 — 58,810 Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 25,602 399 (189 ) 25,812 17,363 342 (49 ) 17,656 Issued by FNMA and FHLMC 222,899 2,956 (313 ) 225,542 10,368 311 — 10,679 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 1,584,338 9,541 (11,019 ) 1,582,860 820,012 4,951 (4,742 ) 820,221 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 278,429 2,689 (1,892 ) 279,226 182,401 1,700 (1,164 ) 182,937 Asset-backed securities and structured financial products 25,003 79 (125 ) 24,957 — — — — Total $ 2,339,562 $ 20,164 $ (14,304 ) $ 2,345,422 $ 1,187,818 $ 13,504 $ (5,955 ) $ 1,195,367
Securities with Gross Unrealized Losses, Segregated by Length of Impairment	The tables below include securities with gross unrealized losses segregated by length of impairment at September 30, 2016 and December 31, 2015 ($ in thousands): Less than 12 Months 12 Months or More Total September 30, 2016 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses U.S. Government agency obligations Issued by U.S. Government agencies $ 10,548 $ (86 ) $ 30,728 $ (421 ) $ 41,276 $ (507 ) Obligations of states and political subdivisions 7,495 (13 ) 969 (2 ) 8,464 (15 ) Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 9,072 (50 ) 249 (4 ) 9,321 (54 ) Issued by FNMA and FHLMC 100,191 (166 ) — — 100,191 (166 ) Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 72,256 (154 ) 98,118 (998 ) 170,374 (1,152 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 10,512 (21 ) 5,815 (108 ) 16,327 (129 ) Total $ 210,074 $ (490 ) $ 135,879 $ (1,533 ) $ 345,953 $ (2,023 ) December 31, 2015 U.S. Government agency obligations Issued by U.S. Government agencies $ 18,924 $ (81 ) $ 30,591 $ (653 ) $ 49,515 $ (734 ) Obligations of states and political subdivisions 4,289 (12 ) 2,842 (20 ) 7,131 (32 ) Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 20,300 (222 ) 1,863 (16 ) 22,163 (238 ) Issued by FNMA and FHLMC 82,177 (313 ) — — 82,177 (313 ) Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 1,135,533 (8,832 ) 238,152 (6,929 ) 1,373,685 (15,761 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 238,668 (2,902 ) 11,090 (154 ) 249,758 (3,056 ) Asset-backed securities and structured financial products 6,778 (125 ) — — 6,778 (125 ) Total $ 1,506,669 $ (12,487 ) $ 284,538 $ (7,772 ) $ 1,791,207 $ (20,259 )
Gains and Losses as a Result of Calls and Disposition of Securities	Gains and losses as a result of calls and dispositions of securities, as well as any associated proceeds, were as follows for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, Available for Sale 2016 2015 2016 2015 Proceeds from calls and sales of securities $ — $ — $ 24,693 $ — Gross realized gains — — 32 — Gross realized (losses) — — (342 ) —
Contractual Maturities of Available for Sale and Held to Maturity Securities	The amortized cost and estimated fair value of securities available for sale and held to maturity at September 30, 2016, by contractual maturity, are shown below ($ in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities Available for Sale Securities Held to Maturity Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 32,173 $ 32,377 $ 5,845 $ 5,845 Due after one year through five years 99,840 103,180 27,025 28,099 Due after five years through ten years 8,263 8,332 23,703 25,577 Due after ten years 39,725 39,269 — — 180,001 183,158 56,573 59,521 Mortgage-backed securities 2,192,719 2,227,789 1,086,661 1,113,580 Total $ 2,372,720 $ 2,410,947 $ 1,143,234 $ 1,173,101

Loans Held for Investment (LH28

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (Tables)	9 Months Ended
	Sep. 30, 2016
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]
Loan Portfolio Held for Investment	At September 30, 2016 and December 31, 2015, LHFI consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Loans secured by real estate: Construction, land development and other land $ 766,685 $ 824,723 Secured by 1-4 family residential properties 1,592,453 1,649,501 Secured by nonfarm, nonresidential properties 1,916,153 1,736,476 Other real estate secured 317,680 211,228 Commercial and industrial loans 1,421,382 1,343,211 Consumer loans 170,073 169,135 State and other political subdivision loans 875,973 734,615 Other loans 438,805 422,496 LHFI 7,499,204 7,091,385 Less allowance for loan losses, LHFI 70,871 67,619 Net LHFI $ 7,428,333 $ 7,023,766
Summary of LHFI Evaluated for Impairment	The following tables detail LHFI individually and collectively evaluated for impairment at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 LHFI Evaluated for Impairment Individually Collectively Total Loans secured by real estate: Construction, land development and other land $ 4,724 $ 761,961 $ 766,685 Secured by 1-4 family residential properties 20,107 1,572,346 1,592,453 Secured by nonfarm, nonresidential properties 10,313 1,905,840 1,916,153 Other real estate secured 1,731 315,949 317,680 Commercial and industrial loans 16,525 1,404,857 1,421,382 Consumer loans 189 169,884 170,073 State and other political subdivision loans — 875,973 875,973 Other loans 821 437,984 438,805 Total $ 54,410 $ 7,444,794 $ 7,499,204 December 31, 2015 LHFI Evaluated for Impairment Individually Collectively Total Loans secured by real estate: Construction, land development and other land $ 6,123 $ 818,600 $ 824,723 Secured by 1-4 family residential properties 23,079 1,626,422 1,649,501 Secured by nonfarm, nonresidential properties 17,800 1,718,676 1,736,476 Other real estate secured 145 211,083 211,228 Commercial and industrial loans 7,622 1,335,589 1,343,211 Consumer loans 31 169,104 169,135 State and other political subdivision loans — 734,615 734,615 Other loans 512 421,984 422,496 Total $ 55,312 $ 7,036,073 $ 7,091,385
Impaired Financing Receivables	At September 30, 2016 and December 31, 2015, the carrying amount of LHFI individually evaluated for impairment consisted of the following ($ in thousands): September 30, 2016 LHFI Unpaid Principal Balance With No Related Allowance Recorded With an Allowance Recorded Total Carrying Amount Related Allowance Average Recorded Investment Loans secured by real estate: Construction, land development and other land $ 8,186 $ 3,113 $ 1,611 $ 4,724 $ 453 $ 5,424 Secured by 1-4 family residential properties 25,160 495 19,612 20,107 1,514 21,593 Secured by nonfarm, nonresidential properties 11,633 1,312 9,001 10,313 2,316 14,058 Other real estate secured 1,782 1,000 731 1,731 90 938 Commercial and industrial loans 18,203 12,055 4,470 16,525 2,305 12,073 Consumer loans 193 — 189 189 2 111 State and other political subdivision loans — — — — — — Other loans 966 — 821 821 154 667 Total $ 66,123 $ 17,975 $ 36,435 $ 54,410 $ 6,834 $ 54,864 December 31, 2015 LHFI Unpaid Principal Balance With No Related Allowance Recorded With an Allowance Recorded Total Carrying Amount Related Allowance Average Recorded Investment Loans secured by real estate: Construction, land development and other land $ 11,113 $ 3,395 $ 2,728 $ 6,123 $ 909 $ 9,995 Secured by 1-4 family residential properties 27,678 283 22,796 23,079 1,230 24,350 Secured by nonfarm, nonresidential properties 20,387 8,037 9,763 17,800 3,402 21,758 Other real estate secured 160 — 145 145 15 732 Commercial and industrial loans 9,880 1,137 6,485 7,622 3,304 9,863 Consumer loans 34 — 31 31 — 59 State and other political subdivision loans — — — — — — Other loans 642 — 512 512 128 570 Total $ 69,894 $ 12,852 $ 42,460 $ 55,312 $ 8,988 $ 67,327
Impact of Modifications Classified as Troubled Debt Restructurings	The following tables illustrate the impact of modifications classified as TDRs as well as those TDRs modified within the last 12 months for which there was a payment default during the period for the periods presented ($ in thousands): Three Months Ended September 30, 2016 2015 Troubled Debt Restructurings Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Loans secured by 1-4 family residential properties — $ — $ — 2 $ 35 $ 35 Nine Months Ended September 30, 2016 2015 Troubled Debt Restructurings Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Construction, land development and other land loans 1 $ 14 $ 14 — $ — $ — Loans secured by 1-4 family residential properties 8 740 740 10 495 495 Loans secured by nonfarm, nonresidential properties — — — 4 3,512 3,512 Consumer loans 1 2 2 — — — Total 10 $ 756 $ 756 14 $ 4,007 $ 4,007
Troubled Debt Restructuring Subsequently Defaulted	Nine Months Ended September 30, 2016 2015 TDRs that Subsequently Defaulted Number of Contracts Recorded Investment Number of Contracts Recorded Investment Loans secured by 1-4 family residential properties 1 $ 101 4 $ 243
Troubled Debt Restructuring Related to Loans Held for Investment, Excluding Covered Loans, by Loan Type	The following tables detail LHFI classified as TDRs by loan type at September 30, 2016 and 2015 ($ in thousands): September 30, 2016 Accruing Nonaccrual Total Loans secured by real estate: Construction, land development and other land $ — $ 556 $ 556 Secured by 1-4 family residential properties — 2,545 2,545 Secured by nonfarm, nonresidential properties — 179 179 Commercial and industrial loans — 387 387 Consumer loans — 2 2 Total TDRs $ — $ 3,669 $ 3,669 September 30, 2015 Accruing Nonaccrual Total Loans secured by real estate: Construction, land development and other land $ — $ 1,006 $ 1,006 Secured by 1-4 family residential properties 1,385 2,921 4,306 Secured by nonfarm, nonresidential properties 819 4,503 5,322 Other real estate secured — 62 62 Commercial and industrial loans — 477 477 Total TDRs $ 2,204 $ 8,969 $ 11,173
Carrying Amount of Loans by Credit Quality Indicator	The tables below illustrate the carrying amount of LHFI by credit quality indicator at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 Commercial LHFI Pass - Categories 1-6 Special Mention - Category 7 Substandard - Category 8 Doubtful - Category 9 Subtotal Loans secured by real estate: Construction, land development and other land $ 687,123 $ 8,494 $ 9,410 $ 469 $ 705,496 Secured by 1-4 family residential properties 124,472 467 6,262 361 131,562 Secured by nonfarm, nonresidential properties 1,870,036 3,196 41,668 494 1,915,394 Other real estate secured 314,858 — 1,957 — 316,815 Commercial and industrial loans 1,304,137 9,094 107,405 746 1,421,382 Consumer loans — — — — — State and other political subdivision loans 858,168 6,450 11,355 — 875,973 Other loans 429,403 340 2,232 642 432,617 Total $ 5,588,197 $ 28,041 $ 180,289 $ 2,712 $ 5,799,239 Consumer LHFI Current Past Due 30-89 Days Past Due 90 Days or More Nonaccrual Subtotal Total LHFI Loans secured by real estate: Construction, land development and other land $ 60,546 $ 176 $ — $ 467 $ 61,189 $ 766,685 Secured by 1-4 family residential properties 1,435,347 8,173 717 16,654 1,460,891 1,592,453 Secured by nonfarm, nonresidential properties 759 — — — 759 1,916,153 Other real estate secured 865 — — — 865 317,680 Commercial and industrial loans — — — — — 1,421,382 Consumer loans 167,817 1,845 218 193 170,073 170,073 State and other political subdivision loans — — — — — 875,973 Other loans 6,188 — — — 6,188 438,805 Total $ 1,671,522 $ 10,194 $ 935 $ 17,314 $ 1,699,965 $ 7,499,204 December 31, 2015 Commercial LHFI Pass - Categories 1-6 Special Mention - Category 7 Substandard Category 8 Doubtful - Category 9 Subtotal Loans secured by real estate: Construction, land development and other land $ 746,227 $ — $ 15,637 $ 529 $ 762,393 Secured by 1-4 family residential properties 125,268 345 7,525 190 133,328 Secured by nonfarm, nonresidential properties 1,680,846 2,031 52,485 361 1,735,723 Other real estate secured 205,097 — 4,768 — 209,865 Commercial and industrial loans 1,295,760 9,473 37,284 694 1,343,211 Consumer loans — — — — — State and other political subdivision loans 713,616 12,478 8,521 — 734,615 Other loans 414,089 183 2,663 375 417,310 Total $ 5,180,903 $ 24,510 $ 128,883 $ 2,149 $ 5,336,445 Consumer LHFI Current Past Due 30-89 Days Past Due 90 Days or More Nonaccrual Subtotal Total LHFI Loans secured by real estate: Construction, land development and other land $ 62,158 $ 146 $ — $ 26 $ 62,330 $ 824,723 Secured by 1-4 family residential properties 1,485,914 7,565 2,058 20,636 1,516,173 1,649,501 Secured by nonfarm, nonresidential properties 753 — — — 753 1,736,476 Other real estate secured 1,363 — — — 1,363 211,228 Commercial and industrial loans — — — — — 1,343,211 Consumer loans 166,681 2,182 242 30 169,135 169,135 State and other political subdivision loans — — — — — 734,615 Other loans 5,186 — — — 5,186 422,496 Total $ 1,722,055 $ 9,893 $ 2,300 $ 20,692 $ 1,754,940 $ 7,091,385
Aging Analysis of Past Due Loans and Nonaccrual Loans, Excluding Covered Loans by Loan Type	The following tables provide an aging analysis of past due and nonaccrual LHFI by loan type at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 Past Due 30-59 Days 60-89 Days 90 Days or (1) Total Nonaccrual Current Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 1,136 $ 78 $ — $ 1,214 $ 4,724 $ 760,747 $ 766,685 Secured by 1-4 family residential properties 6,801 1,803 717 9,321 20,107 1,563,025 1,592,453 Secured by nonfarm, nonresidential properties 576 — 18 594 10,313 1,905,246 1,916,153 Other real estate secured 144 — — 144 1,731 315,805 317,680 Commercial and industrial loans 868 180 — 1,048 16,525 1,403,809 1,421,382 Consumer loans 1,465 380 218 2,063 189 167,821 170,073 State and other political subdivision loans — — — — — 875,973 875,973 Other loans 147 2 — 149 821 437,835 438,805 Total $ 11,137 $ 2,443 $ 953 $ 14,533 $ 54,410 $ 7,430,261 $ 7,499,204 (1) Past due 90 days or more but still accruing interest. December 31, 2015 Past Due 30-59 Days 60-89 Days 90 Days or (1) Total Nonaccrual Current Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 214 $ — $ — $ 214 $ 6,123 $ 818,386 $ 824,723 Secured by 1-4 family residential properties 6,203 1,800 2,058 10,061 23,079 1,616,361 1,649,501 Secured by nonfarm, nonresidential properties 437 88 — 525 17,800 1,718,151 1,736,476 Other real estate secured — — — — 145 211,083 211,228 Commercial and industrial loans 921 45 — 966 7,622 1,334,623 1,343,211 Consumer loans 1,835 347 242 2,424 31 166,680 169,135 State and other political subdivision loans 65 — — 65 — 734,550 734,615 Other loans 68 — — 68 512 421,916 422,496 Total $ 9,743 $ 2,280 $ 2,300 $ 14,323 $ 55,312 $ 7,021,750 $ 7,091,385 (1) Past due 90 days or more but still accruing interest.
Change in Allowance for Loan Losses	Changes in the allowance for loan losses, LHFI were as follows for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Balance at beginning of period $ 71,796 $ 71,166 $ 67,619 $ 69,616 Loans charged-off (8,279 ) (11,406 ) (14,893 ) (18,688 ) Recoveries 3,070 3,333 9,022 9,347 Net charge-offs (5,209 ) (8,073 ) (5,871 ) (9,341 ) Provision for loan losses, LHFI 4,284 2,514 9,123 5,332 Balance at end of period $ 70,871 $ 65,607 $ 70,871 $ 65,607 The following tables detail the balance in the allowance for loan losses, LHFI by loan type at September 30, 2016 and 2015 ($ in thousands): 2016 Balance January 1, Charge-offs Recoveries Provision for Loan Losses Balance September 30, Loans secured by real estate: Construction, land development and other land $ 11,587 $ (212 ) $ 1,006 $ (3,183 ) $ 9,198 Secured by 1-4 family residential properties 10,678 (1,129 ) 680 172 10,401 Secured by nonfarm, nonresidential properties 21,563 (1,662 ) 823 1,479 22,203 Other real estate secured 2,467 — 5 (213 ) 2,259 Commercial and industrial loans 15,815 (6,408 ) 519 10,982 20,908 Consumer loans 2,879 (1,398 ) 3,397 (1,851 ) 3,027 State and other political subdivision loans 809 — — 68 877 Other loans 1,821 (4,084 ) 2,592 1,669 1,998 Total allowance for loan losses, LHFI $ 67,619 $ (14,893 ) $ 9,022 $ 9,123 $ 70,871 Disaggregated by Impairment Method Individually Collectively Total Loans secured by real estate: Construction, land development and other land $ 453 $ 8,745 $ 9,198 Secured by 1-4 family residential properties 1,514 8,887 10,401 Secured by nonfarm, nonresidential properties 2,316 19,887 22,203 Other real estate secured 90 2,169 2,259 Commercial and industrial loans 2,305 18,603 20,908 Consumer loans 2 3,025 3,027 State and other political subdivision loans — 877 877 Other loans 154 1,844 1,998 Total allowance for loan losses, LHFI $ 6,834 $ 64,037 $ 70,871 2015 Balance January 1, Charge-offs Recoveries Provision for Loan Losses Balance September 30, Loans secured by real estate: Construction, land development and other land loans $ 13,073 $ (2,236 ) $ 1,274 $ 395 $ 12,506 Secured by 1-4 family residential properties 9,677 (2,013 ) 781 1,529 9,974 Secured by nonfarm, nonresidential properties 18,523 (1,282 ) 397 (1,517 ) 16,121 Other real estate secured 2,141 (24 ) 6 (382 ) 1,741 Commercial and industrial loans 19,917 (7,243 ) 1,553 5,109 19,336 Consumer loans 2,149 (1,543 ) 2,639 (1,166 ) 2,079 State and other political subdivision loans 1,314 — — (624 ) 690 Other loans 2,822 (4,347 ) 2,697 1,988 3,160 Total allowance for loan losses, LHFI $ 69,616 $ (18,688 ) $ 9,347 $ 5,332 $ 65,607 Disaggregated by Impairment Method Individually Collectively Total Loans secured by real estate: Construction, land development and other land loans $ 2,054 $ 10,452 $ 12,506 Secured by 1-4 family residential properties 267 9,707 9,974 Secured by nonfarm, nonresidential properties 2,602 13,519 16,121 Other real estate secured 28 1,713 1,741 Commercial and industrial loans 2,956 16,380 19,336 Consumer loans — 2,079 2,079 State and other political subdivision loans — 690 690 Other loans 200 2,960 3,160 Total allowance for loan losses, LHFI $ 8,107 $ 57,500 $ 65,607

Acquired Loans (Tables)

Acquired Loans (Tables)	9 Months Ended
	Sep. 30, 2016
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities [Abstract]
Schedule of Covered and Noncovered Acquired Loans by Type	At September 30, 2016 and December 31, 2015, acquired loans consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Noncovered Covered (1) Noncovered Covered Loans secured by real estate: Construction, land development and other land $ 25,040 $ — $ 41,623 $ 1,021 Secured by 1-4 family residential properties 72,689 3,912 86,950 10,058 Secured by nonfarm, nonresidential properties 110,606 — 135,626 4,638 Other real estate secured 20,903 — 23,860 1,286 Commercial and industrial loans 39,519 — 55,075 624 Consumer loans 3,878 — 5,641 — Other loans 19,190 — 23,936 73 Acquired loans 291,825 3,912 372,711 17,700 Less allowance for loan losses, acquired loans 11,330 50 11,259 733 Net acquired loans $ 280,495 $ 3,862 $ 361,452 $ 16,967 (1) Trustmark’s loss share agreement with the FDIC covering the acquired covered loans other than loans secured by 1-4 family residential properties expired on June 30, 2016. Trustmark’s loss share agreement with the FDIC covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021. Effective July 1, 2016, all acquired covered loans excluding the acquired covered loans secured by 1-4 family residential properties were reclassified to acquired noncovered loans.
Changes in the Carrying Value of Acquired Loans	The following table presents changes in the net carrying value of the acquired loans for the periods presented ($ in thousands): Noncovered Covered Acquired Impaired Acquired Not ASC 310-30 (1) Acquired Impaired Acquired Not ASC 310-30 (1) Carrying value, net at January 1, 2015 $ 434,151 $ 81,091 $ 20,504 $ 1,604 Accretion to interest income 28,193 479 2,308 — Payments received, net (164,671 ) (15,484 ) (8,592 ) (33 ) Other (2) (1,589 ) — 391 — Less change in allowance for loan losses, acquired loans (718 ) — 785 — Carrying value, net at December 31, 2015 295,366 66,086 15,396 1,571 Transfers (3) 9,157 446 (9,157 ) (446 ) Accretion to interest income 13,498 40 853 — Payments received, net (75,875 ) (28,861 ) (4,203 ) (421 ) Other (2) 709 — (414 ) — Less change in allowance for loan losses, acquired loans (523 ) 452 1,137 (454 ) Carrying value, net at September 30, 2016 $ 242,332 $ 38,163 $ 3,612 $ 250 (1) "Acquired Not ASC 310-30" loans consist of revolving credit agreements and commercial leases that are not in scope for FASB ASC Topic 310-30, "Loans and Debt Securities Acquired with Deteriorated Credit Quality." (2) Includes miscellaneous timing adjustments as well as acquired loan terminations through foreclosure, charge-off and other terminations. (3) Covered acquired loans transferred to noncovered acquired loans as a result of expiration of the related indemnification agreement with the FDIC on June 30, 2016.
Changes in Accretable Yield of Acquired Loans	The following table presents changes in the accretable yield for the periods presented ($ in thousands): Nine Months Ended September 30, 2016 2015 Accretable yield at beginning of period $ (52,672 ) $ (77,149 ) Accretion to interest income 14,351 24,907 Disposals 4,306 8,194 Reclassification from nonaccretable difference (1) (7,046 ) (12,215 ) Accretable yield at end of period $ (41,061 ) $ (56,263 ) (1) Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cash flows.
Components of the Allowance for Loan Losses on Acquired Loans	The following tables present the components of the allowance for loan losses on acquired loans for the periods presented ($ in thousands): Three Months Ended September 30, 2016 Nine Months Ended September 30, 2016 Noncovered Covered Total Noncovered Covered Total Balance at beginning of period $ 12,218 $ 262 $ 12,480 $ 11,259 $ 733 $ 11,992 Transfers (1) 215 (215 ) — 215 (215 ) — Provision for loan losses, acquired loans 686 5 691 2,969 (362 ) 2,607 Loans charged-off (2,590 ) — (2,590 ) (4,959 ) (82 ) (5,041 ) Recoveries 801 (2 ) 799 1,846 (24 ) 1,822 Net charge-offs (1,789 ) (2 ) (1,791 ) (3,113 ) (106 ) (3,219 ) Balance at end of period $ 11,330 $ 50 $ 11,380 $ 11,330 $ 50 $ 11,380 Three Months Ended September 30, 2015 Nine Months Ended September 30, 2015 Noncovered Covered Total Noncovered Covered Total Balance at beginning of period $ 11,927 $ 702 $ 12,629 $ 10,541 $ 1,518 $ 12,059 Provision for loan losses, acquired loans 1,221 35 1,256 2,797 (369 ) 2,428 Loans charged-off (2,456 ) (110 ) (2,566 ) (5,024 ) (560 ) (5,584 ) Recoveries 725 141 866 3,103 179 3,282 Net (charge-offs) recoveries (1,731 ) 31 (1,700 ) (1,921 ) (381 ) (2,302 ) Balance at end of period $ 11,417 $ 768 $ 12,185 $ 11,417 $ 768 $ 12,185 (1) The allowance for loan losses on covered acquired loans other than loans secured by 1-4 family residential properties transferred to the allowance for loan losses on noncovered acquired loans as a result of expiration of the related indemnification agreement with the FDIC on June 30, 2016.
Carrying Amount of Acquired Loans by Credit Quality Indicator	The tables below illustrate the carrying amount of acquired loans by credit quality indicator at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 Commercial Loans Pass - Categories 1-6 Special Mention - Category 7 Substandard - Category 8 Doubtful - Category 9 Subtotal Noncovered Loans: Loans secured by real estate: Construction, land development and other land $ 14,624 $ 117 $ 7,900 $ 322 $ 22,963 Secured by 1-4 family residential properties 17,629 56 4,249 310 22,244 Secured by nonfarm, nonresidential properties 88,799 1,071 20,167 516 110,553 Other real estate secured 16,313 — 3,482 673 20,468 Commercial and industrial loans 23,860 23 14,230 1,406 39,519 Consumer loans — — — — — Other loans 13,361 — 5,665 162 19,188 Total noncovered loans 174,586 1,267 55,693 3,389 234,935 Covered Loans: (1) Loans secured by real estate: Construction, land development and other land — — — — — Secured by 1-4 family residential properties 185 12 60 — 257 Secured by nonfarm, nonresidential properties — — — — — Other real estate secured — — — — — Commercial and industrial loans — — — — — Other loans — — — — — Total covered loans 185 12 60 — 257 Total acquired loans $ 174,771 $ 1,279 $ 55,753 $ 3,389 $ 235,192 Consumer Loans Current Past Due 30-89 Days Past Due 90 Days or More Nonaccrual (2) Subtotal Total Acquired Loans Noncovered Loans: Loans secured by real estate: Construction, land development and other land $ 2,066 $ 3 $ 8 $ — $ 2,077 $ 25,040 Secured by 1-4 family residential properties 47,666 1,783 902 94 50,445 72,689 Secured by nonfarm, nonresidential properties 53 — — — 53 110,606 Other real estate secured 435 — — — 435 20,903 Commercial and industrial loans — — — — — 39,519 Consumer loans 3,825 48 5 — 3,878 3,878 Other loans 2 — — — 2 19,190 Total noncovered loans 54,047 1,834 915 94 56,890 291,825 Covered Loans: (1) Loans secured by real estate: Construction, land development and other land — — — — — — Secured by 1-4 family residential properties 3,311 136 208 — 3,655 3,912 Secured by nonfarm, nonresidential properties — — — — — — Other real estate secured — — — — — — Commercial and industrial loans — — — — — — Other loans — — — — — — Total covered loans 3,311 136 208 — 3,655 3,912 Total acquired loans $ 57,358 $ 1,970 $ 1,123 $ 94 $ 60,545 $ 295,737 (1) Total dollar balances are presented in this table; however, these loans are covered by the loss-share agreement with the FDIC. TNB is at risk for only 20% of the losses incurred on these loans. (2) Acquired loans not accounted for under FASB ASC Topic 310-30. December 31, 2015 Commercial Loans Pass - Categories 1-6 Special Mention - Category 7 Substandard - Category 8 Doubtful - Category 9 Subtotal Noncovered Loans: Loans secured by real estate: Construction, land development and other land $ 15,839 $ 253 $ 19,252 $ 3,874 $ 39,218 Secured by 1-4 family residential properties 22,272 27 5,033 331 27,663 Secured by nonfarm, nonresidential properties 106,924 2,301 25,690 711 135,626 Other real estate secured 19,346 — 3,777 731 23,854 Commercial and industrial loans 36,670 844 15,526 2,035 55,075 Consumer loans — — — — — Other loans 17,150 — 6,624 162 23,936 Total noncovered loans 218,201 3,425 75,902 7,844 305,372 Covered Loans: (1) Loans secured by real estate: Construction, land development and other land 235 — 588 119 942 Secured by 1-4 family residential properties 869 107 534 — 1,510 Secured by nonfarm, nonresidential properties 4,060 35 472 — 4,567 Other real estate secured 730 — 111 — 841 Commercial and industrial loans 560 22 42 — 624 Other loans 70 — — — 70 Total covered loans 6,524 164 1,747 119 8,554 Total acquired loans $ 224,725 $ 3,589 $ 77,649 $ 7,963 $ 313,926 Consumer Loans Current Past Due 30-89 Days Past Due 90 Days or More Nonaccrual (2) Subtotal Total Acquired Loans Noncovered Loans: Loans secured by real estate: Construction, land development and other land $ 2,353 $ 24 $ 28 $ — $ 2,405 $ 41,623 Secured by 1-4 family residential properties 56,371 1,841 930 145 59,287 86,950 Secured by nonfarm, nonresidential properties — — — — — 135,626 Other real estate secured 6 — — — 6 23,860 Commercial and industrial loans — — — — — 55,075 Consumer loans 5,498 142 1 — 5,641 5,641 Other loans — — — — — 23,936 Total noncovered loans 64,228 2,007 959 145 67,339 372,711 Covered Loans: (1) Loans secured by real estate: Construction, land development and other land 70 9 — — 79 1,021 Secured by 1-4 family residential properties 7,472 314 762 — 8,548 10,058 Secured by nonfarm, nonresidential properties 71 — — — 71 4,638 Other real estate secured 445 — — — 445 1,286 Commercial and industrial loans — — — — — 624 Other loans 3 — — — 3 73 Total covered loans 8,061 323 762 — 9,146 17,700 Total acquired loans $ 72,289 $ 2,330 $ 1,721 $ 145 $ 76,485 $ 390,411 (1) Total dollar balances are presented in this table; however, these loans are covered by the loss-share agreement with the FDIC. TNB is at risk for only 20% of the losses incurred on these loans. (2) Acquired loans not accounted for under FASB ASC Topic 310-30.
Aging Analysis of Past Due and Nonaccrual Acquired Loans, by Class	The following tables provide an aging analysis of contractually past due and nonaccrual acquired loans, by loan type at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 Past Due 30-59 Days 60-89 Days 90 Days or More (1) Total Nonaccrual (2) Current Loans Total Acquired Loans Noncovered loans: Loans secured by real estate: Construction, land development and other land $ 203 $ 12 $ 889 $ 1,104 $ — $ 23,936 $ 25,040 Secured by 1-4 family residential properties 1,679 333 934 2,946 112 69,631 72,689 Secured by nonfarm, nonresidential properties 225 32 857 1,114 338 109,154 110,606 Other real estate secured 112 — 1,458 1,570 — 19,333 20,903 Commercial and industrial loans 832 33 1 866 203 38,450 39,519 Consumer loans 48 — 5 53 — 3,825 3,878 Other loans — — — — — 19,190 19,190 Total noncovered loans 3,099 410 4,144 7,653 653 283,519 291,825 Covered loans: Loans secured by real estate: Construction, land development and other land — — — — — — — Secured by 1-4 family residential properties 55 81 208 344 — 3,568 3,912 Secured by nonfarm, nonresidential properties — — — — — — — Other real estate secured — — — — — — — Commercial and industrial loans — — — — — — — Other loans — — — — — — — Total covered loans 55 81 208 344 — 3,568 3,912 Total acquired loans $ 3,154 $ 491 $ 4,352 $ 7,997 $ 653 $ 287,087 $ 295,737 (1) Past due 90 days or more but still accruing interest. (2) Acquired loans not accounted for under FASB ASC Topic 310-30. December 31, 2015 Past Due 30-59 Days 60-89 Days 90 Days or More (1) Total Nonaccrual (2) Current Loans Total Acquired Loans Noncovered loans: Loans secured by real estate: Construction, land development and other land $ 24 $ 114 $ 13,021 $ 13,159 $ — $ 28,464 $ 41,623 Secured by 1-4 family residential properties 1,544 636 1,220 3,400 387 83,163 86,950 Secured by nonfarm, nonresidential properties 192 195 5,913 6,300 144 129,182 135,626 Other real estate secured 9 — 737 746 — 23,114 23,860 Commercial and industrial loans 82 4 184 270 429 54,376 55,075 Consumer loans 119 23 1 143 — 5,498 5,641 Other loans 85 16 — 101 — 23,835 23,936 Total noncovered loans 2,055 988 21,076 24,119 960 347,632 372,711 Covered loans: Loans secured by real estate: Construction, land development and other land 9 — 119 128 — 893 1,021 Secured by 1-4 family residential properties 428 132 978 1,538 — 8,520 10,058 Secured by nonfarm, nonresidential properties 167 478 — 645 — 3,993 4,638 Other real estate secured — — — — — 1,286 1,286 Commercial and industrial loans — — — — 51 573 624 Other loans — — — — — 73 73 Total covered loans 604 610 1,097 2,311 51 15,338 17,700 Total acquired loans $ 2,659 $ 1,598 $ 22,173 $ 26,430 $ 1,011 $ 362,970 $ 390,411 (1) Past due 90 days or more but still accruing interest. (2) Acquired loans not accounted for under FASB ASC Topic 310-30.

Mortgage Banking (Tables)

Mortgage Banking (Tables)	9 Months Ended
	Sep. 30, 2016
Mortgage Banking [Abstract]
Schedule of Activity in the Mortgage Servicing Rights	The activity in the mortgage servicing rights (MSR) is detailed in the table below for the periods presented ($ in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of period $ 74,007 $ 64,358 Origination of servicing assets 12,392 13,320 Change in fair value: Due to market changes (13,518 ) (433 ) Due to run-off (7,367 ) (7,436 ) Balance at end of period $ 65,514 $ 69,809
Schedule of Mortgage Loans Sold and Serviced for Others	The table below details the mortgage loans sold and serviced for others at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 December 31, 2015 Federal National Mortgage Association $ 3,933,746 $ 3,750,685 Government National Mortgage Association 2,238,400 2,111,797 Federal Home Loan Mortgage Corporation 58,236 67,817 Other 34,214 41,013 Total mortgage loans sold and serviced for others $ 6,264,596 $ 5,971,312
Changes in the Reserve for Mortgage Loan Servicing Putback Expense	Changes in the reserve for mortgage loan servicing putback expense for mortgage loans delivered to FNMA in periods not covered by the November 2013 Resolution Agreement between Trustmark and FNMA and to other entities were as follows for the periods presented ($ in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of period $ 1,685 $ 1,170 Provision for putback expenses 315 210 (Losses) gains (944 ) 211 Balance at end of period $ 1,056 $ 1,591

Other Real Estate and Covered31

Other Real Estate and Covered Other Real Estate (Tables)	9 Months Ended
	Sep. 30, 2016
Other Real Estate And Foreclosed Assets [Abstract]
Changes Gains And Losses Net On Other Real Estate Excluding Covered Other Real Estate	For the periods presented, changes and gains, net on other real estate, excluding covered other real estate, were as follows ($ in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of period $ 77,177 $ 92,509 Additions 21,972 26,832 Disposals (30,494 ) (33,015 ) Write-downs (3,662 ) (2,371 ) Balance at end of period $ 64,993 $ 83,955 Gain, net on the sale of other real estate included in other real estate expense $ 5,350 $ 2,116
Other Real Estate, Excluding Covered Other Real Estate, By Type of Property	At September 30, 2016 and December 31, 2015, other real estate, excluding covered other real estate, by type of property consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Construction, land development and other land properties $ 38,345 $ 47,550 1-4 family residential properties 8,037 10,732 Nonfarm, nonresidential properties 18,611 16,717 Other real estate properties — 2,178 Total other real estate, excluding covered other real estate $ 64,993 $ 77,177
Other Real Estate, Excluding Covered Other Real Estate, By Geographic Location	At September 30, 2016 and December 31, 2015, other real estate, excluding covered other real estate, by geographic location consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Alabama $ 15,574 $ 21,578 Florida 25,147 29,579 Mississippi (1) 16,659 14,312 Tennessee (2) 6,061 9,974 Texas 1,552 1,734 Total other real estate, excluding covered other real estate $ 64,993 $ 77,177 (1) Mississippi includes Central and Southern Mississippi Regions (2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions
Changes and Losses, Net On Covered Other Real Estate	For the periods presented, changes and gains (losses), net on covered other real estate were as follows ($ in thousands): Nine Months Ended September 30, 2016 2015 Balance at beginning of period $ 1,651 $ 6,060 Transfers from covered loans 456 266 FASB ASC 310-30 adjustment for the residual recorded investment (12 ) (902 ) Net transfers from covered loans 444 (636 ) Disposals (1,679 ) (1,404 ) Transfers to noncovered other real estate (388 ) — Write-downs (28 ) (1,155 ) Balance at end of period $ — $ 2,865 Gain (loss), net on the sale of covered other real estate included in other real estate expense $ 801 $ (54 )
Covered Other Real Estate by Type of Property	At September 30, 2016 and December 31, 2015, covered other real estate by type of property consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Construction, land development and other land properties $ — $ 638 1-4 family residential properties — 223 Nonfarm, nonresidential properties — 399 Other real estate properties — 391 Total covered other real estate $ — $ 1,651

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2016
Deposits [Abstract]
Deposits Summary	At September 30, 2016 and December 31, 2015, deposits consisted of the following ($ in thousands): September 30, 2016 December 31, 2015 Noninterest-bearing demand $ 3,111,603 $ 2,998,694 Interest-bearing demand 1,783,655 1,938,497 Savings 3,133,286 2,970,997 Time 1,657,157 1,680,042 Total $ 9,685,701 $ 9,588,230

Securities Sold Under Repurch33

Securities Sold Under Repurchase Agreements (Tables)	9 Months Ended
	Sep. 30, 2016
Securities Sold Under Agreements To Repurchase [Abstract]
Schedule of securities sold under repurchase agreements	The following table presents the securities sold under repurchase agreements by collateral pledged at September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 December 31, 2015 U.S. Government agency obligations Issued by U.S. Government sponsored agencies $ — $ 22,516 Mortgage-backed securities Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 122,865 102,604 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 41,067 — Total securities sold under repurchase agreements $ 163,932 $ 125,120

Defined Benefit and Other Pos34

Defined Benefit and Other Postretirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2016
Trustmark Capital Accumulation Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost	The following table presents information regarding the net periodic benefit cost for the Plan for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Service cost $ 106 $ 127 $ 322 $ 387 Interest cost 847 867 2,507 2,593 Expected return on plan assets (426 ) (1,297 ) (2,470 ) (3,890 ) Recognized net loss due to lump sum settlements 463 603 3,134 1,499 Recognized net actuarial loss 714 969 2,035 2,907 Net periodic benefit cost $ 1,704 $ 1,269 $ 5,528 $ 3,496
Supplemental Retirement Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost	The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Service cost $ 73 $ 107 $ 221 $ 323 Interest cost 542 520 1,630 1,563 Amortization of prior service cost 63 63 188 188 Recognized net actuarial loss 214 246 649 745 Net periodic benefit cost $ 892 $ 936 $ 2,688 $ 2,819

Stock and Incentive Compensat35

Stock and Incentive Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Plan Activity	The following table summarizes the Stock Plan activity for the periods presented: Three Months Ended September 30, 2016 Performance Awards Time-Vested Awards Nonvested shares, beginning of period 239,006 327,197 Granted — 2,000 Released from restriction (1,587 ) (3,379 ) Forfeited (283 ) (917 ) Nonvested shares, end of period 237,136 324,901 Nine Months Ended September 30, 2016 Performance Awards Time-Vested Awards Nonvested shares, beginning of period 212,309 306,657 Granted 99,116 139,291 Released from restriction (40,888 ) (105,717 ) Forfeited (33,401 ) (15,330 ) Nonvested shares, end of period 237,136 324,901
Compensation Expense for Awards Under Stock Plan	The following table presents information regarding compensation expense for awards under the Stock Plan for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Performance awards $ 382 $ 319 $ 789 $ 883 Time-vested awards 559 638 1,952 1,855 Total compensation expense $ 941 $ 957 $ 2,741 $ 2,738

Earnings Per Share (EPS) (Table

Earnings Per Share (EPS) (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Weighted-Average Shares Used to Calculate Basic and Diluted EPS	The following table reflects weighted-average shares used to calculate basic and diluted EPS for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Basic shares 67,625 67,557 67,618 67,547 Dilutive shares 168 150 153 130 Diluted shares 67,793 67,707 67,771 67,677
Weighted-Average Antidilutive Stock Award Excluded from Determining Diluted EPS	Weighted-average antidilutive stock awards were excluded in determining diluted EPS. The following table reflects weighted-average antidilutive stock awards for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Weighted-average antidilutive stock awards — 1 2 1

Statements of Cash Flows (Table

Statements of Cash Flows (Tables)	9 Months Ended
	Sep. 30, 2016
Supplemental Cash Flow Information [Abstract]
Cash Flows Supplementary Disclosures	The following table reflects specific transaction amounts for the periods presented ($ in thousands): Nine Months Ended September 30, 2016 2015 Income taxes paid $ 24,646 $ 15,291 Interest expense paid on deposits and borrowings 17,132 14,639 Noncash transfers from loans to other real estate (1) 21,972 26,196 (1) Includes transfers from covered loans to covered other real estate.

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2016
Stockholders Equity Note [Abstract]
Table of Actual Regulatory Capital Amounts and Ratios	The following table provides Trustmark’s and TNB’s actual regulatory capital amounts and ratios under regulatory capital standards in effect at September 30, 2016 and December 31, 2015 ($ in thousands): Actual Regulatory Capital Minimum To Be Well Amount Ratio Requirement Capitalized At September 30, 2016: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,194,729 12.35 % 5.125 % n/a Trustmark National Bank 1,235,923 12.78 % 5.125 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,254,453 12.97 % 6.625 % n/a Trustmark National Bank 1,235,923 12.78 % 6.625 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,336,704 13.82 % 8.625 % n/a Trustmark National Bank 1,318,174 13.63 % 8.625 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,254,453 9.92 % 4.00 % n/a Trustmark National Bank 1,235,923 9.79 % 4.00 % 5.00 % At December 31, 2015: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,161,598 12.57 % 4.50 % n/a Trustmark National Bank 1,201,113 13.00 % 4.50 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,220,535 13.21 % 6.00 % n/a Trustmark National Bank 1,201,113 13.00 % 6.00 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,300,146 14.07 % 8.00 % n/a Trustmark National Bank 1,280,724 13.86 % 8.00 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,220,535 10.03 % 4.00 % n/a Trustmark National Bank 1,201,113 9.89 % 4.00 % 5.00 %
Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects	The following table presents the components of accumulated other comprehensive loss and the related tax effects allocated to each component for the three and nine months ended September 30, 2016 and 2015 ($ in thousands). Reclassification adjustments related to securities available for sale are included in security losses, net in the accompanying consolidated statements of income. The amortization of prior service cost, recognized net loss due to lump sum settlements and change in net actuarial loss on pension and other postretirement benefit plans are included in the computation of net periodic benefit cost (see Note 9 – Defined Benefit and Other Postretirement Benefits for additional details). Reclassification adjustments related to pension and other postretirement benefit plans are included in salaries and employee benefits in the accompanying consolidated statements of income. Reclassification adjustments related to the cash flow hedge derivative are included in other interest expense in the accompanying consolidated statements of income. Three Months Ended September 30, 2016 Three Months Ended September 30, 2015 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Securities available for sale and transferred securities: Unrealized holding (losses) gains arising during the period $ (12,657 ) $ 4,841 $ (7,816 ) $ 17,872 $ (6,837 ) $ 11,035 Reclassification adjustment for net losses realized in net income — — — — — — Change in net unrealized holding loss on securities transferred to held to maturity 2,677 (1,024 ) 1,653 1,678 (642 ) 1,036 Total securities available for sale and transferred securities (9,980 ) 3,817 (6,163 ) 19,550 (7,479 ) 12,071 Pension and other postretirement benefit plans: Net change in prior service costs 63 (24 ) 39 63 (24 ) 39 Recognized net loss due to lump sum settlements 463 (177 ) 286 603 (230 ) 373 Change in net actuarial loss 928 (355 ) 573 1,216 (465 ) 751 Reclassification related to net losses realized in net income 1,454 (556 ) 898 1,882 (719 ) 1,163 Cash flow hedge derivatives: Change in accumulated loss on effective cash flow hedge derivatives 417 (160 ) 257 (1,216 ) 465 (751 ) Reclassification adjustment for loss realized in net income 157 (60 ) 97 211 (81 ) 130 Total cash flow hedge derivatives 574 (220 ) 354 (1,005 ) 384 (621 ) Total other comprehensive (loss) income $ (7,952 ) $ 3,041 $ (4,911 ) $ 20,427 $ (7,814 ) $ 12,613
Changes in Balances of Component of Accumulated Other Comprehensive Loss	Nine Months Ended September 30, 2016 Nine Months Ended September 30, 2015 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Securities available for sale and transferred securities: Unrealized holding gains arising during the period $ 32,057 $ (12,261 ) $ 19,796 $ 13,718 $ (5,248 ) $ 8,470 Reclassification adjustment for net losses realized in net income 310 (119 ) 191 — — — Change in net unrealized holding loss on securities transferred to held to maturity 8,374 (3,203 ) 5,171 4,747 (1,816 ) 2,931 Total securities available for sale and transferred securities 40,741 (15,583 ) 25,158 18,465 (7,064 ) 11,401 Pension and other postretirement benefit plans: Net change in prior service costs 188 (72 ) 116 188 (72 ) 116 Recognized net loss due to lump sum settlements 3,134 (1,199 ) 1,935 1,499 (573 ) 926 Change in net actuarial loss 2,684 (1,026 ) 1,658 3,653 (1,397 ) 2,256 Reclassification related to net losses realized in net income 6,006 (2,297 ) 3,709 5,340 (2,042 ) 3,298 Cash flow hedge derivatives: Change in accumulated loss on effective cash flow hedge derivatives (1,360 ) 520 (840 ) (1,919 ) 734 (1,185 ) Reclassification adjustment for loss realized in net income 473 (181 ) 292 632 (242 ) 390 Total cash flow hedge derivatives (887 ) 339 (548 ) (1,287 ) 492 (795 ) Total other comprehensive income $ 45,860 $ (17,541 ) $ 28,319 $ 22,518 $ (8,614 ) $ 13,904 The following table presents the changes in the balances of each component of accumulated other comprehensive loss for the periods presented ($ in thousands). All amounts are presented net of tax. Securities Available and Transferred Securities Defined Benefit Pension Items Cash Flow Hedge Derivatives Total Balance at January 1, 2016 $ (17,394 ) $ (27,840 ) $ (160 ) $ (45,394 ) Other comprehensive income (loss) before reclassification 24,967 — (840 ) 24,127 Amounts reclassified from accumulated other comprehensive loss 191 3,709 292 4,192 Net other comprehensive income (loss) 25,158 3,709 (548 ) 28,319 Balance at September 30, 2016 $ 7,764 $ (24,131 ) $ (708 ) $ (17,075 ) Balance at January 1, 2015 $ (11,003 ) $ (31,617 ) $ 136 $ (42,484 ) Other comprehensive (loss) income before reclassification 11,401 3,298 (1,185 ) 13,514 Amounts reclassified from accumulated other comprehensive loss — — 390 390 Net other comprehensive income (loss) 11,401 3,298 (795 ) 13,904 Balance at September 30, 2015 $ 398 $ (28,319 ) $ (659 ) $ (28,580 )

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value Recurring Basis	The following tables summarize financial assets and financial liabilities measured at fair value on a recurring basis as of September 30, 2016 and December 31, 2015, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value ($ in thousands). There were no transfers between fair value levels for the nine months ended September 30, 2016 and the year ended December 31, 2015. September 30, 2016 Total Level 1 Level 2 Level 3 U.S. Government agency obligations $ 58,517 $ — $ 58,517 $ — Obligations of states and political subdivisions 124,641 — 124,641 — Mortgage-backed securities 2,227,789 — 2,227,789 — Securities available for sale 2,410,947 — 2,410,947 — Loans held for sale 242,097 — 242,097 — Mortgage servicing rights 65,514 — — 65,514 Other assets - derivatives 7,901 (25 ) 5,179 2,747 Other liabilities - derivatives 8,583 808 7,775 — December 31, 2015 Total Level 1 Level 2 Level 3 U.S. Government agency obligations $ 68,416 $ — $ 68,416 $ — Obligations of states and political subdivisions 138,609 — 138,609 — Mortgage-backed securities 2,113,440 — 2,113,440 — Asset-backed securities and structured financial products 24,957 — 24,957 — Securities available for sale 2,345,422 — 2,345,422 — Loans held for sale 160,189 — 160,189 — Mortgage servicing rights 74,007 — — 74,007 Other assets - derivatives 3,611 (149 ) 2,647 1,113 Other liabilities - derivatives 3,929 1,220 2,709 —
Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis	The changes in Level 3 assets measured at fair value on a recurring basis for the nine months ended September 30, 2016 and 2015 are summarized as follows ($ in thousands): MSR Other Assets - Derivatives Balance, January 1, 2016 $ 74,007 $ 1,113 Total net (loss) gain included in Mortgage banking, net (1) (20,885 ) 9,486 Additions 12,392 — Sales — (7,852 ) Balance, September 30, 2016 $ 65,514 $ 2,747 The amount of total (losses) gains for the period included in earnings that are attributable to the change in unrealized gains or losses still held at September 30, 2016 $ (13,519 ) $ 904 Balance, January 1, 2015 $ 64,358 $ 1,299 Total net (loss) gain included in Mortgage banking, net (1) (7,869 ) 6,193 Additions 13,320 — Sales — (4,786 ) Balance, September 30, 2015 $ 69,809 $ 2,706 The amount of total losses for the period included in earnings that are attributable to the change in unrealized gains or losses still held at September 30, 2015 $ (433 ) $ (169 ) (1) Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off.
Carrying Amounts and Estimated Fair Values of Financial Instruments	The carrying amounts and estimated fair values of financial instruments at September 30, 2016 and December 31, 2015, are as follows ($ in thousands): September 30, 2016 December 31, 2015 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial Assets: Level 2 Inputs: Cash and short-term investments $ 384,445 $ 384,445 $ 278,001 $ 278,001 Securities held to maturity 1,143,234 1,173,101 1,187,818 1,195,367 Level 3 Inputs: Net LHFI 7,428,333 7,493,082 7,023,766 7,136,105 Net acquired loans 284,357 284,357 378,419 378,419 FDIC indemnification asset — — 738 738 Financial Liabilities: Level 2 Inputs: Deposits 9,685,701 9,689,282 9,588,230 9,592,531 Short-term liabilities 927,710 927,710 853,659 853,659 Long-term FHLB advances 751,075 751,077 501,155 501,160 Subordinated notes 49,993 50,484 49,969 51,405 Junior subordinated debt securities 61,856 40,825 61,856 49,021
Fair Value and the Contractual Principal Outstanding of the LHFS	The following table provides information about the fair value and the contractual principal outstanding of the LHFS accounted for under the fair value option as of September 30, 2016 and December 31, 2015 ($ in thousands): September 30, 2016 December 31, 2015 Fair value of LHFS $ 204,839 $ 124,165 LHFS contractual principal outstanding 198,288 121,608 Fair value less unpaid principal $ 6,551 $ 2,557

Derivative Financial Instrume40

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2016
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments	The following tables disclose the fair value of derivative instruments in Trustmark’s balance sheets as of September 30, 2016 and December 31, 2015 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands): September 30, 2016 December 31, 2015 Derivatives in hedging relationships Interest rate contracts: Interest rate swaps included in other assets $ (1,147 ) $ (259 ) Derivatives not designated as hedging instruments Interest rate contracts: Futures contracts included in other assets $ (199 ) $ (207 ) Exchange traded purchased options included in other assets 174 58 OTC written options (rate locks) included in other assets 2,747 1,113 Interest rate swaps included in other assets 6,298 2,888 Credit risk participation agreements included in other assets 28 18 Forward contracts included in other liabilities 1,170 (262 ) Exchange traded written options included in other liabilities 808 1,220 Interest rate swaps included in other liabilities 6,570 2,954 Credit risk participation agreements included in other liabilities 35 17
Effects of Derivative Instruments on Statements of Operations	Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Derivatives in hedging relationships Amount of loss reclassified from accumulated other comprehensive loss and recognized in other interest expense $ (157 ) $ (211 ) $ (473 ) $ (632 ) Derivatives not designated as hedging instruments Amount of (loss) gain recognized in mortgage banking, net $ (688 ) $ 1,265 $ 11,042 $ 4,221 Amount of gain (loss) recognized in bank card and other fees 1 (128 ) (206 ) (94 )
Schedule of Amount Included in Other Comprehensive Income for Derivative Instruments Designated as Hedges of Cash Flows	The following table discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 Derivatives in cash flow hedging relationship Amount of gain (loss) recognized in other comprehensive income (loss), net of tax $ 257 $ (751 ) $ (840 ) $ (1,185 )
Information about Financial Instruments that are Eligible for Offset in the Consolidated Balance Sheets	Information about financial instruments that are eligible for offset in the consolidated balance sheets as of September 30, 2016 and December 31, 2015 is presented in the following tables ($ in thousands): Offsetting of Derivative Assets As of September 30, 2016 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Derivatives $ 5,151 $ — $ 5,151 $ — $ — $ 5,151 Offsetting of Derivative Liabilities As of September 30, 2016 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities presented in the Statement of Financial Position Financial Instruments Cash Collateral Posted Net Amount Derivatives $ 6,570 $ — $ 6,570 $ — $ (4,932 ) $ 1,638 Offsetting of Derivative Assets As of December 31, 2015 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Derivatives $ 2,629 $ — $ 2,629 $ — $ — $ 2,629 Offsetting of Derivative Liabilities As of December 31, 2015 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities presented in the Statement of Financial Position Financial Instruments Cash Collateral Posted Net Amount Derivatives $ 2,954 $ — $ 2,954 $ — $ (1,195 ) $ 1,759

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Schedule of Segment Information	The following table discloses financial information by reportable segment for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 General Banking Net interest income $ 97,395 $ 97,408 $ 287,950 $ 291,483 Provision for loan losses, net 4,975 3,770 11,730 7,760 Noninterest income 27,207 28,320 81,230 82,477 Noninterest expense 84,358 90,043 267,063 262,403 Income before income taxes 35,269 31,915 90,387 103,797 Income taxes 6,844 6,207 18,168 22,588 General banking net income $ 28,425 $ 25,708 $ 72,219 $ 81,209 Selected Financial Information Average assets $ 12,916,011 $ 12,231,450 $ 12,788,736 $ 12,123,213 Depreciation and amortization $ 9,274 $ 9,209 $ 26,483 $ 27,256 Wealth Management Net interest income $ 119 $ 91 $ 571 $ 194 Noninterest income 7,434 7,748 22,681 23,477 Noninterest expense 6,216 6,195 18,200 19,373 Income before income taxes 1,337 1,644 5,052 4,298 Income taxes 512 629 1,933 1,644 Wealth management net income $ 825 $ 1,015 $ 3,119 $ 2,654 Selected Financial Information Average assets $ 6,039 $ 4,181 $ 1,842 $ 3,020 Depreciation and amortization $ 44 $ 44 $ 131 $ 139 Insurance Net interest income $ 50 $ 107 $ 160 $ 270 Noninterest income 10,075 9,905 28,308 27,925 Noninterest expense 7,334 7,322 21,768 21,266 Income before income taxes 2,791 2,690 6,700 6,929 Income taxes 1,059 983 2,550 2,612 Insurance net income $ 1,732 $ 1,707 $ 4,150 $ 4,317 Selected Financial Information Average assets $ 78,167 $ 78,146 $ 63,652 $ 58,570 Depreciation and amortization $ 186 $ 213 $ 569 $ 600 Consolidated Net interest income $ 97,564 $ 97,606 $ 288,681 $ 291,947 Provision for loan losses, net 4,975 3,770 11,730 7,760 Noninterest income 44,716 45,973 132,219 133,879 Noninterest expense 97,908 103,560 307,031 303,042 Income before income taxes 39,397 36,249 102,139 115,024 Income taxes 8,415 7,819 22,651 26,844 Consolidated net income $ 30,982 $ 28,430 $ 79,488 $ 88,180 Selected Financial Information Average assets $ 13,000,217 $ 12,313,777 $ 12,854,230 $ 12,184,803 Depreciation and amortization $ 9,504 $ 9,466 $ 27,183 $ 27,995

Business, Basis of Financial 42

Business, Basis of Financial Statement Presentation and Principles of Consolidation (Details)	Sep. 30, 2016Office
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of offices	194

Securities Available for Sale43

Securities Available for Sale and Held to Maturity - Amortized Cost and Estimated Fair Value of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 2,372,720	$ 2,339,562
Securities Available for Sale, Gross Unrealized Gains	40,078	20,164
Securities Available for Sale, Gross Unrealized (Losses)	(1,851)	(14,304)
Securities Available for Sale, Estimated Fair Value	2,410,947	2,345,422
Securities Held to Maturity, Amortized Cost	1,143,234	1,187,818
Securities Held to Maturity, Gross Unrealized Gains	30,039	13,504
Securities Held to Maturity, Gross Unrealized (Losses)	(172)	(5,955)
Securities Held to Maturity, Estimated Fair Value	1,173,101	1,195,367
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	58,259	68,314
Securities Available for Sale, Gross Unrealized Gains	482	555
Securities Available for Sale, Gross Unrealized (Losses)	(507)	(734)
Securities Available for Sale, Estimated Fair Value	58,234	68,135
Securities Held to Maturity, Amortized Cost	0	0
Securities Held to Maturity, Gross Unrealized Gains	0	0
Securities Held to Maturity, Gross Unrealized (Losses)	0	0
Securities Held to Maturity, Estimated Fair Value	0	0
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	257	258
Securities Available for Sale, Gross Unrealized Gains	26	23
Securities Available for Sale, Gross Unrealized (Losses)	0	0
Securities Available for Sale, Estimated Fair Value	283	281
Securities Held to Maturity, Amortized Cost	3,636	101,782
Securities Held to Maturity, Gross Unrealized Gains	337	3,282
Securities Held to Maturity, Gross Unrealized (Losses)	0	0
Securities Held to Maturity, Estimated Fair Value	3,973	105,064
Obligations of States and Political Subdivisions [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	121,485	134,719
Securities Available for Sale, Gross Unrealized Gains	3,167	3,922
Securities Available for Sale, Gross Unrealized (Losses)	(11)	(32)
Securities Available for Sale, Estimated Fair Value	124,641	138,609
Securities Held to Maturity, Amortized Cost	52,937	55,892
Securities Held to Maturity, Gross Unrealized Gains	2,615	2,918
Securities Held to Maturity, Gross Unrealized (Losses)	(4)	0
Securities Held to Maturity, Estimated Fair Value	55,548	58,810
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	36,130	25,602
Securities Available for Sale, Gross Unrealized Gains	712	399
Securities Available for Sale, Gross Unrealized (Losses)	(54)	(189)
Securities Available for Sale, Estimated Fair Value	36,788	25,812
Securities Held to Maturity, Amortized Cost	16,183	17,363
Securities Held to Maturity, Gross Unrealized Gains	666	342
Securities Held to Maturity, Gross Unrealized (Losses)	0	(49)
Securities Held to Maturity, Estimated Fair Value	16,849	17,656
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	554,916	222,899
Securities Available for Sale, Gross Unrealized Gains	7,239	2,956
Securities Available for Sale, Gross Unrealized (Losses)	(166)	(313)
Securities Available for Sale, Estimated Fair Value	561,989	225,542
Securities Held to Maturity, Amortized Cost	39,989	10,368
Securities Held to Maturity, Gross Unrealized Gains	810	311
Securities Held to Maturity, Gross Unrealized (Losses)	0	0
Securities Held to Maturity, Estimated Fair Value	40,799	10,679
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	1,353,984	1,584,338
Securities Available for Sale, Gross Unrealized Gains	21,507	9,541
Securities Available for Sale, Gross Unrealized (Losses)	(1,092)	(11,019)
Securities Available for Sale, Estimated Fair Value	1,374,399	1,582,860
Securities Held to Maturity, Amortized Cost	831,662	820,012
Securities Held to Maturity, Gross Unrealized Gains	18,690	4,951
Securities Held to Maturity, Gross Unrealized (Losses)	(60)	(4,742)
Securities Held to Maturity, Estimated Fair Value	850,292	820,221
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	247,689	278,429
Securities Available for Sale, Gross Unrealized Gains	6,945	2,689
Securities Available for Sale, Gross Unrealized (Losses)	(21)	(1,892)
Securities Available for Sale, Estimated Fair Value	254,613	279,226
Securities Held to Maturity, Amortized Cost	198,827	182,401
Securities Held to Maturity, Gross Unrealized Gains	6,921	1,700
Securities Held to Maturity, Gross Unrealized (Losses)	(108)	(1,164)
Securities Held to Maturity, Estimated Fair Value	$ 205,640	182,937
Asset-Backed Securities and Structured Financial Products [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost		25,003
Securities Available for Sale, Gross Unrealized Gains		79
Securities Available for Sale, Gross Unrealized (Losses)		(125)
Securities Available for Sale, Estimated Fair Value		24,957
Securities Held to Maturity, Amortized Cost		0
Securities Held to Maturity, Gross Unrealized Gains		0
Securities Held to Maturity, Gross Unrealized (Losses)		0
Securities Held to Maturity, Estimated Fair Value		$ 0

Securities Available for Sale44

Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2013
Investments Debt And Equity Securities [Abstract]
Reclassification of Securities available for sale to securities held to maturity						$ 1,099,000,000
Net unrealized holding loss on AFS Securities at date of transfer						46,600,000
Net unrealized holding losses on AFS Securities, net of tax at date of transfer						$ 28,800,000
Net unamortized, unrealized loss on transfer of securities	$ 25,700,000		$ 25,700,000
Net unamortized, unrealized loss on transfer of securities, net of tax	15,800,000		15,800,000
Other-than-temporary impairments	0	$ 0	0	$ 0
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law	1,826,000,000		1,826,000,000		$ 2,157,000,000
Pledged securities providing additional contingency funding	$ 0		$ 0		$ 0

Securities Available for Sale45

Securities Available for Sale and Held to Maturity - Securities with Gross Unrealized Losses, Segregated by Length of Impairment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	$ 210,074	$ 210,074	$ 1,506,669
Estimated Fair Value, 12 Months or More	135,879	135,879	284,538
Estimated Fair Value, Total	345,953	345,953	1,791,207
Gross Unrealized (Losses), Less than 12 Months		(490)	(12,487)
Gross Unrealized (Losses), 12 Months or More		(1,533)	(7,772)
Gross Unrealized (Losses), Total		(2,023)	(20,259)
U.S. Government Agency Obligations Issued by U.S. Government Agencies [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	10,548	10,548	18,924
Estimated Fair Value, 12 Months or More	30,728	30,728	30,591
Estimated Fair Value, Total	41,276	41,276	49,515
Gross Unrealized (Losses), Less than 12 Months		(86)	(81)
Gross Unrealized (Losses), 12 Months or More		(421)	(653)
Gross Unrealized (Losses), Total		(507)	(734)
Obligations of States and Political Subdivisions [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	7,495	7,495	4,289
Estimated Fair Value, 12 Months or More	969	969	2,842
Estimated Fair Value, Total	8,464	8,464	7,131
Gross Unrealized (Losses), Less than 12 Months		(13)	(12)
Gross Unrealized (Losses), 12 Months or More		(2)	(20)
Gross Unrealized (Losses), Total		(15)	(32)
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	9,072	9,072	20,300
Estimated Fair Value, 12 Months or More	249	249	1,863
Estimated Fair Value, Total	9,321	9,321	22,163
Gross Unrealized (Losses), Less than 12 Months		(50)	(222)
Gross Unrealized (Losses), 12 Months or More		(4)	(16)
Gross Unrealized (Losses), Total		(54)	(238)
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	100,191	100,191	82,177
Estimated Fair Value, 12 Months or More	0	0	0
Estimated Fair Value, Total	100,191	100,191	82,177
Gross Unrealized (Losses), Less than 12 Months	(166)		(313)
Gross Unrealized (Losses), 12 Months or More	0		0
Gross Unrealized (Losses), Total	(166)		(313)
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	72,256	72,256	1,135,533
Estimated Fair Value, 12 Months or More	98,118	98,118	238,152
Estimated Fair Value, Total	170,374	170,374	1,373,685
Gross Unrealized (Losses), Less than 12 Months		(154)	(8,832)
Gross Unrealized (Losses), 12 Months or More		(998)	(6,929)
Gross Unrealized (Losses), Total		(1,152)	(15,761)
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	10,512	10,512	238,668
Estimated Fair Value, 12 Months or More	5,815	5,815	11,090
Estimated Fair Value, Total	$ 16,327	16,327	249,758
Gross Unrealized (Losses), Less than 12 Months		(21)	(2,902)
Gross Unrealized (Losses), 12 Months or More		(108)	(154)
Gross Unrealized (Losses), Total		$ (129)	(3,056)
Asset-Backed Securities and Structured Financial Products [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months			6,778
Estimated Fair Value, 12 Months or More			0
Estimated Fair Value, Total			6,778
Gross Unrealized (Losses), Less than 12 Months			(125)
Gross Unrealized (Losses), 12 Months or More			0
Gross Unrealized (Losses), Total			$ (125)

Securities Available for Sale46

Securities Available for Sale and Held to Maturity - Gains and Losses as a Result of Calls and Disposition of Securities (Details) - Available for Sale [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Gains (losses) on Investments [Abstract]
Proceeds from calls and sales of securities	$ 0	$ 0	$ 24,693	$ 0
Gross realized gains	0	0	32	0
Gross realized (losses)	$ 0	$ 0	$ (342)	$ 0

Securities Available for Sale47

Securities Available for Sale and Held to Maturity - Contractual Maturities of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Securities Available for Sale, Amortized Cost [Abstract]
Due in one year or less	$ 32,173
Due after one year through five years	99,840
Due after five years through ten years	8,263
Due after ten years	39,725
Total amortized cost, before mortgage-backed securities	180,001
Mortgage-backed securities	2,192,719
Total	2,372,720
Securities Available for Sale, Estimated Fair Value [Abstract]
Due in one year or less	32,377
Due after one year through five years	103,180
Due after five years through ten years	8,332
Due after ten years	39,269
Total fair value, before mortgage-backed securities	183,158
Mortgage-backed securities	2,227,789
Total	2,410,947	$ 2,345,422
Securities Held to Maturity, Amortized Cost [Abstract]
Due in one year or less	5,845
Due after one year through five years	27,025
Due after five years through ten years	23,703
Due after ten years	0
Total amortized cost, before mortgage-backed securities	56,573
Mortgage-backed securities	1,086,661
Securities Held to Maturity, Amortized Cost	1,143,234	1,187,818
Securities Held to Maturity, Estimated Fair Value [Abstract]
Due in one year or less	5,845
Due after one year through five years	28,099
Due after five years through ten years	25,577
Due after ten years	0
Total fair value, before mortgage-backed securities	59,521
Mortgage-backed securities	1,113,580
Total	$ 1,173,101	$ 1,195,367

Loans Held for Investment (LH48

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Loan Portfolio Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Loan Portfolio [Abstract]
Total LHFI	$ 7,499,204	$ 7,091,385
Less allowance for loan losses, LHFI	70,871	67,619
Net LHFI	7,428,333	7,023,766
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	766,685	824,723
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	1,592,453	1,649,501
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	317,680	211,228
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	1,916,153	1,736,476
Commercial and Industrial Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	1,421,382	1,343,211
Consumer Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	170,073	169,135
State and Other Political Subdivision Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	875,973	734,615
Other Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	$ 438,805	$ 422,496

Loans Held for Investment (LH49

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 1)	9 Months Ended
	Sep. 30, 2016USD ($)Region	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Financing Receivable Impaired [Line Items]
Maximum concentration of loan as a percentage of total LHFI	10.00%
Key market regions | Region	5
Carrying amounts of nonaccrual LHFI considered for impairment analysis	$ 54,400,000		$ 55,300,000
Minimum loan amount for loan to be individually assessed for impairment	500,000
Nonaccrual	54,410,000		55,312,000
Nonaccrual financing receivable, specifically evaluated for impairment	28,600,000		26,500,000
Nonaccrual financing receivable, allowance for credit losses, charge-offs, specifically evaluated for impairment	5,000,000	$ 9,700,000
Nonaccrual financing receivable specifically evaluated for impairment allowance for credit losses provisions	(2,000,000)	4,500,000
Nonaccrual financing receivable, allowance for credit losses, deterioration value reserve	4,500,000		7,000,000
Nonaccrual financing receivable, not specifically evaluated for impairment	25,800,000		28,800,000
Nonaccrual financing receivable, allowance for credit losses, not specifically evaluated for impairment	2,300,000		2,000,000
Amount held by company of foreclosure or in substance repossession of consumer mortgage LHFI classified as TDRs	880,000		1,000,000
TDRs Classified as Consumer mortgage LHFI in the process of formal disclosure	0		83,000
LHFI Classified as TDRs	3,700,000	11,200,000
LHFI classified as TDRs from credits with interest only payments	1,600,000	7,500,000
Financing receivable, related allowance	31,000	1,200,000
Financing receivable, related charge-offs	1,000,000	806,000
Troubled Debt Restructurings [Member]
Financing Receivable Impaired [Line Items]
Nonaccrual	$ 3,669,000	$ 8,969,000	$ 7,400,000

Loans Held for Investment (LH50

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of LHFI Evaluated for Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Loans and Leases Receivable, Other Information [Abstract]
LHFI, Individually Evaluated For Impairment	$ 54,410	$ 55,312
LHFI, Collectively Evaluated For Impairment	7,444,794	7,036,073
Total LHFI	7,499,204	7,091,385
Commercial and Industrial Loans [Member]
Loans and Leases Receivable, Other Information [Abstract]
LHFI, Individually Evaluated For Impairment	16,525	7,622
LHFI, Collectively Evaluated For Impairment	1,404,857	1,335,589
Total LHFI	1,421,382	1,343,211
Consumer Loans [Member]
Loans and Leases Receivable, Other Information [Abstract]
LHFI, Individually Evaluated For Impairment	189	31
LHFI, Collectively Evaluated For Impairment	169,884	169,104
Total LHFI	170,073	169,135
State and Other Political Subdivision Loans [Member]
Loans and Leases Receivable, Other Information [Abstract]
LHFI, Individually Evaluated For Impairment	0	0
LHFI, Collectively Evaluated For Impairment	875,973	734,615
Total LHFI	875,973	734,615
Other Loans [Member]
Loans and Leases Receivable, Other Information [Abstract]
LHFI, Individually Evaluated For Impairment	821	512
LHFI, Collectively Evaluated For Impairment	437,984	421,984
Total LHFI	438,805	422,496
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Loans and Leases Receivable, Other Information [Abstract]
LHFI, Individually Evaluated For Impairment	4,724	6,123
LHFI, Collectively Evaluated For Impairment	761,961	818,600
Total LHFI	766,685	824,723
Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Loans and Leases Receivable, Other Information [Abstract]
LHFI, Individually Evaluated For Impairment	20,107	23,079
LHFI, Collectively Evaluated For Impairment	1,572,346	1,626,422
Total LHFI	1,592,453	1,649,501
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Loans and Leases Receivable, Other Information [Abstract]
LHFI, Individually Evaluated For Impairment	10,313	17,800
LHFI, Collectively Evaluated For Impairment	1,905,840	1,718,676
Total LHFI	1,916,153	1,736,476
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Loans and Leases Receivable, Other Information [Abstract]
LHFI, Individually Evaluated For Impairment	1,731	145
LHFI, Collectively Evaluated For Impairment	315,949	211,083
Total LHFI	$ 317,680	$ 211,228

Loans Held for Investment (LH51

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Impaired Financing Receivables (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	$ 66,123	$ 69,894
Total LHFI With No Related Allowance Recorded	17,975	12,852
Total LHFI With an Allowance Recorded	36,435	42,460
Total LHFI Carrying Amount	54,410	55,312
Related Allowance	6,834	8,988
Average Recorded Investment	54,864	67,327
Commercial and Industrial Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	18,203	9,880
Total LHFI With No Related Allowance Recorded	12,055	1,137
Total LHFI With an Allowance Recorded	4,470	6,485
Total LHFI Carrying Amount	16,525	7,622
Related Allowance	2,305	3,304
Average Recorded Investment	12,073	9,863
Consumer Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	193	34
Total LHFI With No Related Allowance Recorded	0	0
Total LHFI With an Allowance Recorded	189	31
Total LHFI Carrying Amount	189	31
Related Allowance	2	0
Average Recorded Investment	111	59
State and Other Political Subdivision Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	0	0
Total LHFI With No Related Allowance Recorded	0	0
Total LHFI With an Allowance Recorded	0	0
Total LHFI Carrying Amount	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Other Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	966	642
Total LHFI With No Related Allowance Recorded	0	0
Total LHFI With an Allowance Recorded	821	512
Total LHFI Carrying Amount	821	512
Related Allowance	154	128
Average Recorded Investment	667	570
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	8,186	11,113
Total LHFI With No Related Allowance Recorded	3,113	3,395
Total LHFI With an Allowance Recorded	1,611	2,728
Total LHFI Carrying Amount	4,724	6,123
Related Allowance	453	909
Average Recorded Investment	5,424	9,995
Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	25,160	27,678
Total LHFI With No Related Allowance Recorded	495	283
Total LHFI With an Allowance Recorded	19,612	22,796
Total LHFI Carrying Amount	20,107	23,079
Related Allowance	1,514	1,230
Average Recorded Investment	21,593	24,350
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	11,633	20,387
Total LHFI With No Related Allowance Recorded	1,312	8,037
Total LHFI With an Allowance Recorded	9,001	9,763
Total LHFI Carrying Amount	10,313	17,800
Related Allowance	2,316	3,402
Average Recorded Investment	14,058	21,758
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	1,782	160
Total LHFI With No Related Allowance Recorded	1,000	0
Total LHFI With an Allowance Recorded	731	145
Total LHFI Carrying Amount	1,731	145
Related Allowance	90	15
Average Recorded Investment	$ 938	$ 732

Loans Held for Investment (LH52

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Impact of Modifications Classified as Troubled Debt Restructurings (Details) - Troubled Debt Restructurings [Member] $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015USD ($)Contract	Sep. 30, 2016USD ($)Contract	Sep. 30, 2015USD ($)Contract
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract		10	14
Pre-Modification Outstanding Recorded Investment		$ 756	$ 4,007
Post-Modification Outstanding Recorded Investment		$ 756	$ 4,007
Construction, Land Development and Other Land Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract		1
Pre-Modification Outstanding Recorded Investment		$ 14
Post-Modification Outstanding Recorded Investment		$ 14
Secured by Nonfarm, Nonresidential Properties [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract			4
Pre-Modification Outstanding Recorded Investment			$ 3,512
Post-Modification Outstanding Recorded Investment			$ 3,512
Consumer Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract		1
Pre-Modification Outstanding Recorded Investment		$ 2
Post-Modification Outstanding Recorded Investment		$ 2
Secured by 1-4 Family Residential Properties [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract	2	8	10
Pre-Modification Outstanding Recorded Investment	$ 35	$ 740	$ 495
Post-Modification Outstanding Recorded Investment	$ 35	$ 740	$ 495

Loans Held for Investment (LH53

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Troubled Debt Restructuring Subsequently Defaulted (Details) - Troubled Debt Restructurings that Subsequently Defaulted [Member] - Secured by 1-4 Family Residential Properties [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)Contract	Sep. 30, 2015USD ($)Contract
Troubled Debt Restructurings [Abstract]
Number of Contracts | Contract	1	4
Recorded Investment | $	$ 101	$ 243

Loans Held for Investment (LH54

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Troubled Debt Restructuring Related to Loans Held for Investment, Excluding Covered Loans, by Loan Type (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Financing Receivable Modifications [Line Items]
Nonaccrual	$ 54,410	$ 55,312
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	4,724	6,123
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	20,107	23,079
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	10,313	17,800
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	16,525	7,622
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	189	31
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	1,731	145
Troubled Debt Restructurings [Member]
Financing Receivable Modifications [Line Items]
Accruing			$ 2,204
Nonaccrual	3,669	$ 7,400	8,969
Total	3,669		11,173
Troubled Debt Restructurings [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	0		0
Nonaccrual	556		1,006
Total	556		1,006
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing			1,385
Nonaccrual	2,545		2,921
Total	2,545		4,306
Troubled Debt Restructurings [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing			819
Nonaccrual	179		4,503
Total	179		5,322
Troubled Debt Restructurings [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing	0		0
Nonaccrual	387		477
Total	387		477
Troubled Debt Restructurings [Member] | Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	2
Total	$ 2
Troubled Debt Restructurings [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing			0
Nonaccrual			62
Total			$ 62

Loans Held for Investment (LH55

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 2)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2015USD ($)	Sep. 30, 2016USD ($)KeyRatioLoanPoolCreditRiskGrade	Dec. 31, 2015USD ($)
Financing Receivable, Recorded Investment, Aging [Abstract]
Number of days used as baseline in evaluating collateral documentation exceptions for loan policy		90 days
Number of key quality ratios | KeyRatio		6
LHFS past due 90 days or more		$ 25,600,000	$ 21,800,000
Percentage of outstanding principal to be repurchased under GNMA optional repurchase program		100.00%
Amount of delinquent loans repurchased	$ 28,500,000
Repurchase gain included in gain on sales of loans			$ 304,000
Financing Receivable [Abstract]
Number of primary commercial loan groups | LoanPool		9
Number of individual credit risk grades | CreditRiskGrade		10
Minimum [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Loan amount used as baseline in credit quality review for loan policy		$ 1,000,000
Financing Receivable [Abstract]
Period to conduct asset review		6 months
Credit amount used as baseline in evaluating loan policy		$ 100,000
Maximum [Member]
Financing Receivable [Abstract]
Period to conduct asset review		18 months

Loans Held for Investment (LH56

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Carrying Amount of Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Financing Receivable [Abstract]
Current		$ 7,430,261	$ 7,021,750
Financing Receivable, Recorded Investment, Past Due		14,533	14,323
Nonaccrual		54,410	55,312
Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due	[1]	953	2,300
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Current		760,747	818,386
Financing Receivable, Recorded Investment, Past Due		1,214	214
Nonaccrual		4,724	6,123
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Current		1,563,025	1,616,361
Financing Receivable, Recorded Investment, Past Due		9,321	10,061
Nonaccrual		20,107	23,079
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due	[1]	717	2,058
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Current		1,905,246	1,718,151
Financing Receivable, Recorded Investment, Past Due		594	525
Nonaccrual		10,313	17,800
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due	[1]	18
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Current		315,805	211,083
Financing Receivable, Recorded Investment, Past Due		144
Nonaccrual		1,731	145
Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Current		1,403,809	1,334,623
Financing Receivable, Recorded Investment, Past Due		1,048	966
Nonaccrual		16,525	7,622
Consumer Loans [Member]
Financing Receivable [Abstract]
Current		167,821	166,680
Financing Receivable, Recorded Investment, Past Due		2,063	2,424
Nonaccrual		189	31
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due	[1]	218	242
State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
Current		875,973	734,550
Financing Receivable, Recorded Investment, Past Due			65
Other Loans [Member]
Financing Receivable [Abstract]
Current		437,835	421,916
Financing Receivable, Recorded Investment, Past Due		149	68
Nonaccrual		821	512
Commercial LHFI [Member]
Financing Receivable [Abstract]
Financing receivable commercial		5,799,239	5,336,445
Commercial LHFI [Member] | Pass [Member]
Financing Receivable [Abstract]
Financing receivable commercial		5,588,197	5,180,903
Commercial LHFI [Member] | Special Mention [Member]
Financing Receivable [Abstract]
Financing receivable commercial		28,041	24,510
Commercial LHFI [Member] | Substandard [Member]
Financing Receivable [Abstract]
Financing receivable commercial		180,289	128,883
Commercial LHFI [Member] | Doubtful [Member]
Financing Receivable [Abstract]
Financing receivable commercial		2,712	2,149
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		705,496	762,393
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		687,123	746,227
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		8,494
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		9,410	15,637
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		469	529
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		131,562	133,328
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		124,472	125,268
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		467	345
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		6,262	7,525
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		361	190
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,915,394	1,735,723
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,870,036	1,680,846
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		3,196	2,031
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		41,668	52,485
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		494	361
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		316,815	209,865
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		314,858	205,097
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,957	4,768
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,421,382	1,343,211
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Pass [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,304,137	1,295,760
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Special Mention [Member]
Financing Receivable [Abstract]
Financing receivable commercial		9,094	9,473
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Substandard [Member]
Financing Receivable [Abstract]
Financing receivable commercial		107,405	37,284
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Doubtful [Member]
Financing Receivable [Abstract]
Financing receivable commercial		746	694
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		875,973	734,615
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Pass [Member]
Financing Receivable [Abstract]
Financing receivable commercial		858,168	713,616
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Special Mention [Member]
Financing Receivable [Abstract]
Financing receivable commercial		6,450	12,478
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Substandard [Member]
Financing Receivable [Abstract]
Financing receivable commercial		11,355	8,521
Commercial LHFI [Member] | Other Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		432,617	417,310
Commercial LHFI [Member] | Other Loans [Member] | Pass [Member]
Financing Receivable [Abstract]
Financing receivable commercial		429,403	414,089
Commercial LHFI [Member] | Other Loans [Member] | Special Mention [Member]
Financing Receivable [Abstract]
Financing receivable commercial		340	183
Commercial LHFI [Member] | Other Loans [Member] | Substandard [Member]
Financing Receivable [Abstract]
Financing receivable commercial		2,232	2,663
Commercial LHFI [Member] | Other Loans [Member] | Doubtful [Member]
Financing Receivable [Abstract]
Financing receivable commercial		642	375
Consumer LHFI [Member]
Financing Receivable [Abstract]
Financing receivable commercial		7,499,204	7,091,385
Current		1,671,522	1,722,055
Nonaccrual		17,314	20,692
Subtotal		1,699,965	1,754,940
Consumer LHFI [Member] | Past Due 30-89 Days [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		10,194	9,893
Consumer LHFI [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		935	2,300
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		766,685	824,723
Current		60,546	62,158
Nonaccrual		467	26
Subtotal		61,189	62,330
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		176	146
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,592,453	1,649,501
Current		1,435,347	1,485,914
Nonaccrual		16,654	20,636
Subtotal		1,460,891	1,516,173
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		8,173	7,565
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		717	2,058
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,916,153	1,736,476
Current		759	753
Subtotal		759	753
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		317,680	211,228
Current		865	1,363
Subtotal		865	1,363
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,421,382	1,343,211
Consumer LHFI [Member] | Consumer Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		170,073	169,135
Current		167,817	166,681
Nonaccrual		193	30
Subtotal		170,073	169,135
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		1,845	2,182
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		218	242
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		875,973	734,615
Consumer LHFI [Member] | Other Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		438,805	422,496
Current		6,188	5,186
Subtotal		$ 6,188	$ 5,186
[1]	Past due 90 days or more but still accruing interest.

Loans Held for Investment (LH57

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Aging Analysis of Past Due Loans and Nonaccrual Loans, Excluding Covered Loans by Loan Type (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		$ 14,533	$ 14,323
Nonaccrual		54,410	55,312
Current Loans		7,430,261	7,021,750
Total LHFI		7,499,204	7,091,385
Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		11,137	9,743
Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		2,443	2,280
Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	[1]	953	2,300
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,214	214
Nonaccrual		4,724	6,123
Current Loans		760,747	818,386
Total LHFI		766,685	824,723
Construction, Land Development and Other Land [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,136	214
Construction, Land Development and Other Land [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		78
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		9,321	10,061
Nonaccrual		20,107	23,079
Current Loans		1,563,025	1,616,361
Total LHFI		1,592,453	1,649,501
Secured by 1-4 Family Residential Properties [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		6,801	6,203
Secured by 1-4 Family Residential Properties [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,803	1,800
Secured by 1-4 Family Residential Properties [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	[1]	717	2,058
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		594	525
Nonaccrual		10,313	17,800
Current Loans		1,905,246	1,718,151
Total LHFI		1,916,153	1,736,476
Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		576	437
Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due			88
Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	[1]	18
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		144
Nonaccrual		1,731	145
Current Loans		315,805	211,083
Total LHFI		317,680	211,228
Other Real Estate Secured [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		144
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,048	966
Nonaccrual		16,525	7,622
Current Loans		1,403,809	1,334,623
Total LHFI		1,421,382	1,343,211
Commercial and Industrial Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		868	921
Commercial and Industrial Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		180	45
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		2,063	2,424
Nonaccrual		189	31
Current Loans		167,821	166,680
Total LHFI		170,073	169,135
Consumer Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,465	1,835
Consumer Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		380	347
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	[1]	218	242
State and Other Political Subdivision Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due			65
Current Loans		875,973	734,550
Total LHFI		875,973	734,615
State and Other Political Subdivision Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due			65
Other Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		149	68
Nonaccrual		821	512
Current Loans		437,835	421,916
Total LHFI		438,805	422,496
Other Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		147	$ 68
Other Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		$ 2
[1]	Past due 90 days or more but still accruing interest.

Loans Held for Investment (LH58

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 3)	9 Months Ended
	Sep. 30, 2016LoanFactorScale
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Number of loan types for commercial portfolio | Loan	9
Number of risk rate factors for commercial loans | Factor	450
Minimum score for qualitative risk factor | Scale	0
Maximum score for qualitative risk factor | Scale	100
Number of loan types for consumer portfolio | Loan	5
Number of unique qualitative factors used to analyze consumer loans | Factor	4

Loans Held for Investment (LH59

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			$ 67,619
Provision for loan losses, LHFI	$ 4,284	$ 2,514	9,123	$ 5,332
Balance at end of period	70,871		70,871
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total	70,871		70,871		$ 70,871
Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	71,796	71,166	67,619	69,616
Loans charged-off	(8,279)	(11,406)	(14,893)	(18,688)
Recoveries	3,070	3,333	9,022	9,347
Net charge-offs	(5,209)	(8,073)	(5,871)	(9,341)
Provision for loan losses, LHFI	4,284	2,514	9,123	5,332
Balance at end of period	70,871	65,607	70,871	65,607
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually					6,834	$ 8,107
Collectively					64,037	57,500
Total	71,796	71,166	67,619	69,616	70,871	65,607
Allowance for Loan Losses, LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			11,587	13,073
Loans charged-off			(212)	(2,236)
Recoveries			1,006	1,274
Provision for loan losses, LHFI			(3,183)	395
Balance at end of period	9,198	12,506	9,198	12,506
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually					453	2,054
Collectively					8,745	10,452
Total	9,198	12,506	11,587	13,073	9,198	12,506
Allowance for Loan Losses, LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			10,678	9,677
Loans charged-off			(1,129)	(2,013)
Recoveries			680	781
Provision for loan losses, LHFI			172	1,529
Balance at end of period	10,401	9,974	10,401	9,974
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually					1,514	267
Collectively					8,887	9,707
Total	10,401	9,974	10,678	9,677	10,401	9,974
Allowance for Loan Losses, LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			21,563	18,523
Loans charged-off			(1,662)	(1,282)
Recoveries			823	397
Provision for loan losses, LHFI			1,479	(1,517)
Balance at end of period	22,203	16,121	22,203	16,121
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually					2,316	2,602
Collectively					19,887	13,519
Total	22,203	16,121	21,563	18,523	22,203	16,121
Allowance for Loan Losses, LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			2,467	2,141
Loans charged-off				(24)
Recoveries			5	6
Provision for loan losses, LHFI			(213)	(382)
Balance at end of period	2,259	1,741	2,259	1,741
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually					90	28
Collectively					2,169	1,713
Total	2,259	1,741	2,467	2,141	2,259	1,741
Allowance for Loan Losses, LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			15,815	19,917
Loans charged-off			(6,408)	(7,243)
Recoveries			519	1,553
Provision for loan losses, LHFI			10,982	5,109
Balance at end of period	20,908	19,336	20,908	19,336
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually					2,305	2,956
Collectively					18,603	16,380
Total	20,908	19,336	15,815	19,917	20,908	19,336
Allowance for Loan Losses, LHFI [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			2,879	2,149
Loans charged-off			(1,398)	(1,543)
Recoveries			3,397	2,639
Provision for loan losses, LHFI			(1,851)	(1,166)
Balance at end of period	3,027	2,079	3,027	2,079
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually					2
Collectively					3,025	2,079
Total	3,027	2,079	2,879	2,149	3,027	2,079
Allowance for Loan Losses, LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			809	1,314
Provision for loan losses, LHFI			68	(624)
Balance at end of period	877	690	877	690
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively					877	690
Total	877	690	809	1,314	877	690
Allowance for Loan Losses, LHFI [Member] | Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			1,821	2,822
Loans charged-off			(4,084)	(4,347)
Recoveries			2,592	2,697
Provision for loan losses, LHFI			1,669	1,988
Balance at end of period	1,998	3,160	1,998	3,160
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually					154	200
Collectively					1,844	2,960
Total	$ 1,998	$ 3,160	$ 1,821	$ 2,822	$ 1,998	$ 3,160

Acquired Loans - Schedule of Co

Acquired Loans - Schedule of Covered and Noncovered Acquired Loans by Type (Details) - USD ($) $ in Thousands	Sep. 30, 2016		Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	$ 295,737			$ 390,411
Less allowance for loan losses, acquired loans	11,380		$ 12,480	11,992	$ 12,185	$ 12,629	$ 12,059
Noncovered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	291,825			372,711
Less allowance for loan losses, acquired loans	11,330		12,218	11,259	11,417	11,927	10,541
Net acquired loans	280,495			361,452
Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	3,912	[1]		17,700
Less allowance for loan losses, acquired loans	50	[1]	$ 262	733	$ 768	$ 702	$ 1,518
Net acquired loans	3,862	[1]		16,967
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	25,040			41,623
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	0	[1]		1,021
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	72,689			86,950
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	3,912	[1]		10,058
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	110,606			135,626
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	0	[1]		4,638
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	20,903			23,860
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	0	[1]		1,286
Commercial and Industrial Loans [Member] | Noncovered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	39,519			55,075
Commercial and Industrial Loans [Member] | Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	0	[1]		624
Consumer Loans [Member] | Noncovered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	3,878			5,641
Consumer Loans [Member] | Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	0	[1]		0
Other Loans [Member] | Noncovered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	19,190			23,936
Other Loans [Member] | Covered Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	$ 0	[1]		$ 73
[1]	Trustmark’s loss share agreement with the FDIC covering the acquired covered loans other than loans secured by 1-4 family residential properties expired on June 30, 2016. Trustmark’s loss share agreement with the FDIC covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021. Effective July 1, 2016, all acquired covered loans excluding the acquired covered loans secured by 1-4 family residential properties were reclassified to acquired noncovered loans.

Acquired Loans - Changes in the

Acquired Loans - Changes in the Carrying Value of Acquired Loans (Details) - USD ($) $ in Thousands		9 Months Ended			12 Months Ended
		Sep. 30, 2016		Sep. 30, 2015	Dec. 31, 2015
Carrying value of acquired loans [Abstract]
Accretion to interest income		$ 14,351		$ 24,907
Noncovered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning		361,452
Carrying value, net, ending		280,495			$ 361,452
Covered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning		16,967
Carrying value, net, ending		3,862	[1]		16,967
Acquired Not ASC 310-30 [Member] | Noncovered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning	[2]	66,086		81,091	81,091
Transfers	[2],[3]	446
Accretion to interest income	[2]	40			479
Payments received, net	[2]	(28,861)			(15,484)
Other	[2],[4]	0			0
Less change in allowance for loan losses, acquired loans	[2]	452			0
Carrying value, net, ending	[2]	38,163			66,086
Acquired Not ASC 310-30 [Member] | Covered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning	[2]	1,571		1,604	1,604
Transfers	[2],[3]	(446)
Accretion to interest income	[2]	0			0
Payments received, net	[2]	(421)			(33)
Other	[2],[4]	0			0
Less change in allowance for loan losses, acquired loans	[2]	(454)			0
Carrying value, net, ending	[2]	250			1,571
Acquired Impaired [Member] | Noncovered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning		295,366		434,151	434,151
Transfers	[3]	9,157
Accretion to interest income		13,498			28,193
Payments received, net		(75,875)			(164,671)
Other	[4]	709			(1,589)
Less change in allowance for loan losses, acquired loans		(523)			(718)
Carrying value, net, ending		242,332			295,366
Acquired Impaired [Member] | Covered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning		15,396		$ 20,504	20,504
Transfers	[3]	(9,157)
Accretion to interest income		853			2,308
Payments received, net		(4,203)			(8,592)
Other	[4]	(414)			391
Less change in allowance for loan losses, acquired loans		1,137			785
Carrying value, net, ending		$ 3,612			$ 15,396
[1]	Trustmark’s loss share agreement with the FDIC covering the acquired covered loans other than loans secured by 1-4 family residential properties expired on June 30, 2016. Trustmark’s loss share agreement with the FDIC covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021. Effective July 1, 2016, all acquired covered loans excluding the acquired covered loans secured by 1-4 family residential properties were reclassified to acquired noncovered loans.
[2]	"Acquired Not ASC 310-30" loans consist of revolving credit agreements and commercial leases that are not in scope for FASB ASC Topic 310-30, "Loans and Debt Securities Acquired with Deteriorated Credit Quality."
[3]	Covered acquired loans transferred to noncovered acquired loans as a result of expiration of the related indemnification agreement with the FDIC on June 30, 2016.
[4]	Includes miscellaneous timing adjustments as well as acquired loan terminations through foreclosure, charge-off and other terminations.

Acquired Loans - Changes in Acc

Acquired Loans - Changes in Accretable Yield of Acquired Loans (Details) - USD ($) $ in Thousands		9 Months Ended		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Change in accretable difference on acquired loans [Abstract]
Accretable yield at beginning of period		$ (52,672)	$ (77,149)	$ (77,149)
Accretion to interest income		14,351	24,907
Disposals		4,306	8,194
Reclassification from nonaccretable difference	[1]	(7,046)	(12,215)
Accretable yield at end of period		$ (41,061)	$ (56,263)	$ (52,672)
[1]	Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cash flows.

Acquired Loans - Components of

Acquired Loans - Components of the Allowance for Loan Losses on Acquired Loans (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		$ 12,480		$ 12,629	$ 11,992		$ 12,059
Provision for loan losses, acquired loans		691		1,256	2,607		2,428
Loans charged-off		(2,590)		(2,566)	(5,041)		(5,584)
Recoveries		799		866	1,822		3,282
Net (charge-offs) recoveries		(1,791)		(1,700)	(3,219)		(2,302)
Balance at end of period		11,380		12,185	11,380		12,185
Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		12,218		11,927	11,259		10,541
Transfers	[1]	215			215
Provision for loan losses, acquired loans		686		1,221	2,969		2,797
Loans charged-off		(2,590)		(2,456)	(4,959)		(5,024)
Recoveries		801		725	1,846		3,103
Net (charge-offs) recoveries		(1,789)		(1,731)	(3,113)		(1,921)
Balance at end of period		11,330		11,417	11,330		11,417
Covered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		262		702	733		1,518
Transfers	[1]	(215)			(215)
Provision for loan losses, acquired loans		5		35	(362)		(369)
Loans charged-off				(110)	(82)		(560)
Recoveries		(2)		141	(24)		179
Net (charge-offs) recoveries		(2)		31	(106)		(381)
Balance at end of period		$ 50	[2]	$ 768	$ 50	[2]	$ 768
[1]	The allowance for loan losses on covered acquired loans other than loans secured by 1-4 family residential properties transferred to the allowance for loan losses on noncovered acquired loans as a result of expiration of the related indemnification agreement with the FDIC on June 30, 2016.
[2]	Trustmark’s loss share agreement with the FDIC covering the acquired covered loans other than loans secured by 1-4 family residential properties expired on June 30, 2016. Trustmark’s loss share agreement with the FDIC covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021. Effective July 1, 2016, all acquired covered loans excluding the acquired covered loans secured by 1-4 family residential properties were reclassified to acquired noncovered loans.

Acquired Loans - Additional Inf

Acquired Loans - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016USD ($)CreditRiskGrade	Dec. 31, 2015USD ($)
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities [Abstract]
Number of individual credit risk grades | CreditRiskGrade	10
Nonaccrual loans not accounted for under FASB ASC Topic 310 30 | $	$ 653	$ 1,000

Acquired Loans - Carrying Amoun

Acquired Loans - Carrying Amount of Acquired Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands		Sep. 30, 2016		Dec. 31, 2015
Acquired Loans, Aging [Abstract]
Current		$ 287,087		$ 362,970
Acquired Loans, Past Due		7,997		26,430
Nonaccrual	[1]	653		1,011
Total Acquired Loans		295,737		390,411
Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	4,352		22,173
Noncovered Loans [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		280,495		361,452
Acquired Loans, Aging [Abstract]
Current		283,519		347,632
Acquired Loans, Past Due		7,653		24,119
Nonaccrual	[1]	653		960
Total Acquired Loans		291,825		372,711
Noncovered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	4,144		21,076
Covered Loans [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		3,862	[3]	16,967
Acquired Loans, Aging [Abstract]
Current		3,568		15,338
Acquired Loans, Past Due		344		2,311
Nonaccrual	[1]	0		51
Total Acquired Loans		3,912	[3]	17,700
Covered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	208		1,097
Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		23,936		28,464
Acquired Loans, Past Due		1,104		13,159
Nonaccrual	[1]	0		0
Total Acquired Loans		25,040		41,623
Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	889		13,021
Construction, Land Development and Other Land [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		0		893
Acquired Loans, Past Due		0		128
Nonaccrual	[1]	0		0
Total Acquired Loans		0	[3]	1,021
Construction, Land Development and Other Land [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	0		119
Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		69,631		83,163
Acquired Loans, Past Due		2,946		3,400
Nonaccrual	[1]	112		387
Total Acquired Loans		72,689		86,950
Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	934		1,220
Secured by 1-4 Family Residential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		3,568		8,520
Acquired Loans, Past Due		344		1,538
Nonaccrual	[1]	0		0
Total Acquired Loans		3,912	[3]	10,058
Secured by 1-4 Family Residential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	208		978
Secured by Nonfarm, Nonresidential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		109,154		129,182
Acquired Loans, Past Due		1,114		6,300
Nonaccrual	[1]	338		144
Total Acquired Loans		110,606		135,626
Secured by Nonfarm, Nonresidential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	857		5,913
Secured by Nonfarm, Nonresidential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		0		3,993
Acquired Loans, Past Due		0		645
Nonaccrual	[1]	0		0
Total Acquired Loans		0	[3]	4,638
Secured by Nonfarm, Nonresidential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	0		0
Other Real Estate Secured [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		19,333		23,114
Acquired Loans, Past Due		1,570		746
Nonaccrual	[1]	0		0
Total Acquired Loans		20,903		23,860
Other Real Estate Secured [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	1,458		737
Other Real Estate Secured [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		0		1,286
Acquired Loans, Past Due		0		0
Nonaccrual	[1]	0		0
Total Acquired Loans		0	[3]	1,286
Other Real Estate Secured [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	0		0
Commercial and Industrial Loans [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Current		38,450		54,376
Acquired Loans, Past Due		866		270
Nonaccrual	[1]	203		429
Total Acquired Loans		39,519		55,075
Commercial and Industrial Loans [Member] | Noncovered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	1		184
Commercial and Industrial Loans [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Current		0		573
Acquired Loans, Past Due		0		0
Nonaccrual	[1]	0		51
Total Acquired Loans		0	[3]	624
Commercial and Industrial Loans [Member] | Covered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	0		0
Consumer Loans [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Current		3,825		5,498
Acquired Loans, Past Due		53		143
Nonaccrual	[1]	0		0
Total Acquired Loans		3,878		5,641
Consumer Loans [Member] | Noncovered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	5		1
Consumer Loans [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans		0	[3]	0
Other Loans [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Current		19,190		23,835
Acquired Loans, Past Due		0		101
Nonaccrual	[1]	0		0
Total Acquired Loans		19,190		23,936
Other Loans [Member] | Noncovered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	0		0
Other Loans [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Current		0		73
Acquired Loans, Past Due		0		0
Nonaccrual	[1]	0		0
Total Acquired Loans		0	[3]	73
Other Loans [Member] | Covered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[2]	0		0
Commercial LHFI [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		235,192		313,926
Commercial LHFI [Member] | Pass [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		174,771		224,725
Commercial LHFI [Member] | Special Mention [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		1,279		3,589
Commercial LHFI [Member] | Substandard [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		55,753		77,649
Commercial LHFI [Member] | Doubtful [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		3,389		7,963
Commercial LHFI [Member] | Noncovered Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		234,935		305,372
Commercial LHFI [Member] | Noncovered Loans [Member] | Pass [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		174,586		218,201
Commercial LHFI [Member] | Noncovered Loans [Member] | Special Mention [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		1,267		3,425
Commercial LHFI [Member] | Noncovered Loans [Member] | Substandard [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		55,693		75,902
Commercial LHFI [Member] | Noncovered Loans [Member] | Doubtful [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		3,389		7,844
Commercial LHFI [Member] | Covered Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		257		8,554
Commercial LHFI [Member] | Covered Loans [Member] | Pass [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		185		6,524
Commercial LHFI [Member] | Covered Loans [Member] | Special Mention [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		12		164
Commercial LHFI [Member] | Covered Loans [Member] | Substandard [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		60		1,747
Commercial LHFI [Member] | Covered Loans [Member] | Doubtful [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				119
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		22,963		39,218
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		14,624		15,839
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		117		253
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		7,900		19,252
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		322		3,874
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				942
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Covered Loans [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				235
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Covered Loans [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				588
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Covered Loans [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				119
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		22,244		27,663
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		17,629		22,272
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		56		27
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		4,249		5,033
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		310		331
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		257		1,510
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Covered Loans [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		185		869
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Covered Loans [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		12		107
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Covered Loans [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		60		534
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		110,553		135,626
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Noncovered Loans [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		88,799		106,924
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Noncovered Loans [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		1,071		2,301
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Noncovered Loans [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		20,167		25,690
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Noncovered Loans [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		516		711
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				4,567
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Covered Loans [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				4,060
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Covered Loans [Member] | Special Mention [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				35
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Covered Loans [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				472
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		20,468		23,854
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Noncovered Loans [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		16,313		19,346
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Noncovered Loans [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		3,482		3,777
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Noncovered Loans [Member] | Doubtful [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		673		731
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				841
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Covered Loans [Member] | Pass [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				730
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Covered Loans [Member] | Substandard [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				111
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Noncovered Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		39,519		55,075
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Noncovered Loans [Member] | Pass [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		23,860		36,670
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Noncovered Loans [Member] | Special Mention [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		23		844
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Noncovered Loans [Member] | Substandard [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		14,230		15,526
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Noncovered Loans [Member] | Doubtful [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		1,406		2,035
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Covered Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				624
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Covered Loans [Member] | Pass [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				560
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Covered Loans [Member] | Special Mention [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				22
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Covered Loans [Member] | Substandard [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				42
Commercial LHFI [Member] | Other Loans [Member] | Noncovered Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		19,188		23,936
Commercial LHFI [Member] | Other Loans [Member] | Noncovered Loans [Member] | Pass [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		13,361		17,150
Commercial LHFI [Member] | Other Loans [Member] | Noncovered Loans [Member] | Substandard [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		5,665		6,624
Commercial LHFI [Member] | Other Loans [Member] | Noncovered Loans [Member] | Doubtful [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans		162		162
Commercial LHFI [Member] | Other Loans [Member] | Covered Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				70
Commercial LHFI [Member] | Other Loans [Member] | Covered Loans [Member] | Pass [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans				70
Consumer LHFI [Member]
Acquired Loans, Aging [Abstract]
Current		57,358		72,289
Nonaccrual	[1]	94		145
Subtotal		60,545		76,485
Total Acquired Loans		295,737		390,411
Consumer LHFI [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		1,970		2,330
Consumer LHFI [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		1,123		1,721
Consumer LHFI [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Current		54,047		64,228
Nonaccrual	[1]	94		145
Subtotal		56,890		67,339
Total Acquired Loans		291,825		372,711
Consumer LHFI [Member] | Noncovered Loans [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		1,834		2,007
Consumer LHFI [Member] | Noncovered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		915		959
Consumer LHFI [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Current		3,311		8,061
Subtotal		3,655		9,146
Total Acquired Loans		3,912		17,700
Consumer LHFI [Member] | Covered Loans [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		136		323
Consumer LHFI [Member] | Covered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		208		762
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		2,066		2,353
Subtotal		2,077		2,405
Total Acquired Loans		25,040		41,623
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		3		24
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		8		28
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current				70
Subtotal				79
Total Acquired Loans				1,021
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due				9
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		47,666		56,371
Nonaccrual	[1]	94		145
Subtotal		50,445		59,287
Total Acquired Loans		72,689		86,950
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		1,783		1,841
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		902		930
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		3,311		7,472
Subtotal		3,655		8,548
Total Acquired Loans		3,912		10,058
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		136		314
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		208		762
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		53
Subtotal		53
Total Acquired Loans		110,606		135,626
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current				71
Subtotal				71
Total Acquired Loans				4,638
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Noncovered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current		435		6
Subtotal		435		6
Total Acquired Loans		20,903		23,860
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Covered Loans [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current				445
Subtotal				445
Total Acquired Loans				1,286
Consumer LHFI [Member] | Commercial and Industrial Loans [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans		39,519		55,075
Consumer LHFI [Member] | Commercial and Industrial Loans [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans				624
Consumer LHFI [Member] | Consumer Loans [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Current		3,825		5,498
Subtotal		3,878		5,641
Total Acquired Loans		3,878		5,641
Consumer LHFI [Member] | Consumer Loans [Member] | Noncovered Loans [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		48		142
Consumer LHFI [Member] | Consumer Loans [Member] | Noncovered Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		5		1
Consumer LHFI [Member] | Other Loans [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Current		2
Subtotal		2
Total Acquired Loans		$ 19,190		23,936
Consumer LHFI [Member] | Other Loans [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Current				3
Subtotal				3
Total Acquired Loans				$ 73
[1]	Acquired loans not accounted for under FASB ASC Topic 310-30.
[2]	Past due 90 days or more but still accruing interest.
[3]	Trustmark’s loss share agreement with the FDIC covering the acquired covered loans other than loans secured by 1-4 family residential properties expired on June 30, 2016. Trustmark’s loss share agreement with the FDIC covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021. Effective July 1, 2016, all acquired covered loans excluding the acquired covered loans secured by 1-4 family residential properties were reclassified to acquired noncovered loans.

Acquired Loans - Carrying Amo66

Acquired Loans - Carrying Amount of Acquired Loans by Credit Quality Indicator (Parenthetical) (Details)	Sep. 30, 2016	Dec. 31, 2015
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities [Abstract]
Percentage of risk of losses incurred on acquired covered loans	20.00%	20.00%

Acquired Loans - Aging Analysis

Acquired Loans - Aging Analysis of Past Due and Nonaccrual Acquired Loans, by Class (Details) - USD ($) $ in Thousands		Sep. 30, 2016		Dec. 31, 2015
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		$ 7,997		$ 26,430
Nonaccrual	[1]	653		1,011
Current		287,087		362,970
Acquired Loans		295,737		390,411
Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		7,653		24,119
Nonaccrual	[1]	653		960
Current		283,519		347,632
Acquired Loans		291,825		372,711
Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		344		2,311
Nonaccrual	[1]	0		51
Current		3,568		15,338
Acquired Loans		3,912	[2]	17,700
Past Due 30 to 59 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		3,154		2,659
Past Due 30 to 59 Days [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		3,099		2,055
Past Due 30 to 59 Days [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		55		604
Past Due 60 to 89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		491		1,598
Past Due 60 to 89 Days [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		410		988
Past Due 60 to 89 Days [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		81		610
Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	4,352		22,173
Past Due 90 Days or More [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	4,144		21,076
Past Due 90 Days or More [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	208		1,097
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		1,104		13,159
Nonaccrual	[1]	0		0
Current		23,936		28,464
Acquired Loans		25,040		41,623
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		128
Nonaccrual	[1]	0		0
Current		0		893
Acquired Loans		0	[2]	1,021
Construction, Land Development and Other Land [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		203		24
Construction, Land Development and Other Land [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		9
Construction, Land Development and Other Land [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		12		114
Construction, Land Development and Other Land [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Construction, Land Development and Other Land [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	889		13,021
Construction, Land Development and Other Land [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	0		119
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		2,946		3,400
Nonaccrual	[1]	112		387
Current		69,631		83,163
Acquired Loans		72,689		86,950
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		344		1,538
Nonaccrual	[1]	0		0
Current		3,568		8,520
Acquired Loans		3,912	[2]	10,058
Secured by 1-4 Family Residential Properties [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		1,679		1,544
Secured by 1-4 Family Residential Properties [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		55		428
Secured by 1-4 Family Residential Properties [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		333		636
Secured by 1-4 Family Residential Properties [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		81		132
Secured by 1-4 Family Residential Properties [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	934		1,220
Secured by 1-4 Family Residential Properties [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	208		978
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		1,114		6,300
Nonaccrual	[1]	338		144
Current		109,154		129,182
Acquired Loans		110,606		135,626
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		645
Nonaccrual	[1]	0		0
Current		0		3,993
Acquired Loans		0	[2]	4,638
Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		225		192
Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		167
Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		32		195
Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		478
Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	857		5,913
Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	0		0
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		1,570		746
Nonaccrual	[1]	0		0
Current		19,333		23,114
Acquired Loans		20,903		23,860
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Nonaccrual	[1]	0		0
Current		0		1,286
Acquired Loans		0	[2]	1,286
Other Real Estate Secured [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		112		9
Other Real Estate Secured [Member] | Past Due 30 to 59 Days [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Other Real Estate Secured [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Other Real Estate Secured [Member] | Past Due 60 to 89 Days [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Other Real Estate Secured [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	1,458		737
Other Real Estate Secured [Member] | Past Due 90 Days or More [Member] | Loans Secured by Real Estate [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	0		0
Commercial and Industrial Loans [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		866		270
Nonaccrual	[1]	203		429
Current		38,450		54,376
Acquired Loans		39,519		55,075
Commercial and Industrial Loans [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Nonaccrual	[1]	0		51
Current		0		573
Acquired Loans		0	[2]	624
Commercial and Industrial Loans [Member] | Past Due 30 to 59 Days [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		832		82
Commercial and Industrial Loans [Member] | Past Due 30 to 59 Days [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Commercial and Industrial Loans [Member] | Past Due 60 to 89 Days [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		33		4
Commercial and Industrial Loans [Member] | Past Due 60 to 89 Days [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	1		184
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	0		0
Consumer Loans [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		53		143
Nonaccrual	[1]	0		0
Current		3,825		5,498
Acquired Loans		3,878		5,641
Consumer Loans [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans		0	[2]	0
Consumer Loans [Member] | Past Due 30 to 59 Days [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		48		119
Consumer Loans [Member] | Past Due 60 to 89 Days [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		23
Consumer Loans [Member] | Past Due 90 Days or More [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	5		1
Other Loans [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		101
Nonaccrual	[1]	0		0
Current		19,190		23,835
Acquired Loans		19,190		23,936
Other Loans [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Nonaccrual	[1]	0		0
Current		0		73
Acquired Loans		0	[2]	73
Other Loans [Member] | Past Due 30 to 59 Days [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		85
Other Loans [Member] | Past Due 30 to 59 Days [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Other Loans [Member] | Past Due 60 to 89 Days [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		16
Other Loans [Member] | Past Due 60 to 89 Days [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due		0		0
Other Loans [Member] | Past Due 90 Days or More [Member] | Noncovered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	0		0
Other Loans [Member] | Past Due 90 Days or More [Member] | Covered Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	[3]	$ 0		$ 0
[1]	Acquired loans not accounted for under FASB ASC Topic 310-30.
[2]	Trustmark’s loss share agreement with the FDIC covering the acquired covered loans other than loans secured by 1-4 family residential properties expired on June 30, 2016. Trustmark’s loss share agreement with the FDIC covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021. Effective July 1, 2016, all acquired covered loans excluding the acquired covered loans secured by 1-4 family residential properties were reclassified to acquired noncovered loans.
[3]	Past due 90 days or more but still accruing interest.

Mortgage Banking - Schedule of

Mortgage Banking - Schedule of Activity in the Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Mortgage servicing rights [Abstract]
Balance at beginning of period	$ 74,007	$ 64,358
Origination of servicing assets	12,392	13,320
Change in fair value [Abstract]
Due to market changes	(13,518)	(433)
Due to run-off	(7,367)	(7,436)
Balance at end of period	$ 65,514	$ 69,809

Mortgage Banking - Additional I

Mortgage Banking - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Mortgage servicing rights [Abstract]
Period of putback response	60 days
Mortgage loan servicing putback expenses	$ 315	$ 210
Residential mortgage loans sold	1,016,000	930,500
Gains on sales of residential mortgage loans, before tax	$ 14,500	$ 13,300

Mortgage Banking - Schedule o70

Mortgage Banking - Schedule of Mortgage Loans Sold and Serviced for Others (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 6,264,596	$ 5,971,312
Federal National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	3,933,746	3,750,685
Government National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	2,238,400	2,111,797
Federal Home Loan Mortgage Corporation [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	58,236	67,817
Other [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 34,214	$ 41,013

Mortgage Banking - Changes in t

Mortgage Banking - Changes in the Reserve for Mortgage Loan Servicing Putback Expense (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Schedule of changes in the reserve for mortgage loan [Abstract]
Balance at beginning of period	$ 1,685	$ 1,170
Provision for putback expenses	315	210
(Losses) gains	(944)	211
Balance at end of period	$ 1,056	$ 1,591

Other Real Estate and Covered72

Other Real Estate and Covered Other Real Estate - Changes and Gains, Net on Other Real Estate, Excluding Covered Other Real Estate (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Balance at beginning of period	$ 77,177	$ 92,509
Additions	21,972	26,832
Disposals	(30,494)	(33,015)
Write-downs	(3,662)	(2,371)
Balance at end of period	64,993	83,955
Gain, net on the sale of other real estate included in other real estate expense	$ 5,350	$ 2,116

Other Real Estate and Covered73

Other Real Estate and Covered Other Real Estate - Other Real Estate, Excluding Covered Other Real Estate, By Type of Property (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	$ 64,993	$ 77,177	$ 83,955	$ 92,509
Construction, Land Development And Other Land Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	38,345	47,550
1 - 4 Family Residential Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	8,037	10,732
Nonfarm, Nonresidential Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	$ 18,611	16,717
Other Real Estate Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate		$ 2,178

Other Real Estate and Covered74

Other Real Estate and Covered Other Real Estate - Other Real Estate, Excluding Covered Other Real Estate, By Geographic Location (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate		$ 64,993	$ 77,177	$ 83,955	$ 92,509
Alabama [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate		15,574	21,578
Florida [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate		25,147	29,579
Mississippi [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	[1]	16,659	14,312
Tennessee [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	[2]	6,061	9,974
Texas [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate		$ 1,552	$ 1,734
[1]	Mississippi includes Central and Southern Mississippi Regions
[2]	Tennessee includes Memphis, Tennessee and Northern Mississippi Regions

Other Real Estate and Covered75

Other Real Estate and Covered Other Real Estate - Additional Information (Details) - USD ($) $ in Thousands	Jul. 01, 2016	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Other Real Estate [Abstract]
Transfers to non covered other real estate	$ 388	$ 388
Covered other real estate		$ 0	$ 1,651	$ 2,865	$ 6,060

Other Real Estate and Covered76

Other Real Estate and Covered Other Real Estate - Changes and Losses, Net On Covered Other Real Estate (Details) - USD ($) $ in Thousands	Jul. 01, 2016	Sep. 30, 2016	Sep. 30, 2015
Covered Other Real Estate Roll Forward
Covered other real estate, beginning of period		$ 1,651	$ 6,060
Transfers from covered loans		456	266
FASB ASC 310-30 adjustment for the residual recorded investment		(12)	(902)
Net transfers from covered loans		444	(636)
Disposals		(1,679)	(1,404)
Transfers to noncovered other real estate	$ (388)	(388)
Write-downs		(28)	(1,155)
Covered other real estate, end of period		0	2,865
Gain (loss), net on the sale of covered other real estate included in other real estate expense		$ 801	$ (54)

Other Real Estate and Covered77

Other Real Estate and Covered Other Real Estate - Covered Other Real Estate by Type of Property (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Other real estate, covered other real estate [Line Items]
Total covered other real estate	$ 0	$ 1,651	$ 2,865	$ 6,060
Construction, Land Development and Other Land [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	0	638
Secured by 1-4 Family Residential Properties [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	0	223
Loans secured by Nonfarm, Nonresidential Properties [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	0	399
Other Real Estate Secured [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	$ 0	$ 391

Deposits - Deposits Summary (De

Deposits - Deposits Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Deposits [Abstract]
Noninterest-bearing demand	$ 3,111,603	$ 2,998,694
Interest-bearing demand	1,783,655	1,938,497
Savings	3,133,286	2,970,997
Time	1,657,157	1,680,042
Total deposits	$ 9,685,701	$ 9,588,230

Securities Sold Under Repurch79

Securities Sold Under Repurchase Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 163,932	$ 125,120
U.S. Government Agency Obligations Issued by U.S. Government Sponsored Agencies [Member]
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements		22,516
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	122,865	$ 102,604
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 41,067

Defined Benefit and Other Pos80

Defined Benefit and Other Postretirement Benefits - Additional Information (Details) - Trustmark Capital Accumulation Plan [Member] - USD ($)	3 Months Ended	6 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Jun. 30, 2016	Sep. 30, 2016	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Years of service required to vest				3 years
Expected rate of return on plan assets			6.00%
Increase in periodic benefit costs	$ 664,000
Scenario Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected rate of return on plan assets		2.50%
Trustmark's minimum required contribution to Trustmark Capital Accumulation Plan					$ 0

Defined Benefit and Other Pos81

Defined Benefit and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Trustmark Capital Accumulation Plan [Member]
Net periodic benefit cost [Abstract]
Service cost	$ 106	$ 127	$ 322	$ 387
Interest cost	847	867	2,507	2,593
Expected return on plan assets	(426)	(1,297)	(2,470)	(3,890)
Recognized net loss due to lump sum settlements	463	603	3,134	1,499
Recognized net actuarial loss	714	969	2,035	2,907
Net periodic benefit cost	1,704	1,269	5,528	3,496
Supplemental Retirement Plan [Member]
Net periodic benefit cost [Abstract]
Service cost	73	107	221	323
Interest cost	542	520	1,630	1,563
Amortization of prior service cost	63	63	188	188
Recognized net actuarial loss	214	246	649	745
Net periodic benefit cost	$ 892	$ 936	$ 2,688	$ 2,819

Stock and Incentive Compensat82

Stock and Incentive Compensation Plans (Details)	9 Months Ended
	Sep. 30, 2016
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Return on average tangible equity, performance measure	100.00%
Performance Based Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Time-Vested Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years

Stock and Incentive Compensat83

Stock and Incentive Compensation Plans - Summary of Stock Plan Activity (Details) - Stock and Incentive Compensation Plan [Member] - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
Performance Based Award [Member]
Shares [Roll Forward]
Nonvested shares, beginning of period (in shares)	239,006	212,309
Granted (in shares)		99,116
Released from restriction (in shares)	(1,587)	(40,888)
Forfeited (in shares)	(283)	(33,401)
Nonvested shares, end of period (in shares)	237,136	237,136
Time-Vested Awards [Member]
Shares [Roll Forward]
Nonvested shares, beginning of period (in shares)	327,197	306,657
Granted (in shares)	2,000	139,291
Released from restriction (in shares)	(3,379)	(105,717)
Forfeited (in shares)	(917)	(15,330)
Nonvested shares, end of period (in shares)	324,901	324,901

Stock and Incentive Compensat84

Stock and Incentive Compensation Plans - Compensation Expense for Awards Under Stock Plan (Details) - Stock and Incentive Compensation Plan [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total compensation expense	$ 941	$ 957	$ 2,741	$ 2,738
Performance Based Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total compensation expense	382	319	789	883
Time-Vested Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total compensation expense	$ 559	$ 638	$ 1,952	$ 1,855

Contingencies - Additional Info

Contingencies - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)Lawsuit	Sep. 30, 2015USD ($)
Loss Contingencies [Line Items]
Unused commitments to extend credit	$ 3,110	$ 2,724
Pending or Threatened Litigation, Stanford Financial Group [Member]
Legal Proceedings [Abstract]
Lawsuits naming entity as defendant, number | Lawsuit	3
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit, maturity term - maximum	3 years
Collateral held, fair value	$ 27.7	31.7
Standby Letters of Credit [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Potential exposure to credit loss in the event of nonperformance	$ 113.5	$ 132.2

Earnings Per Share (EPS) - Weig

Earnings Per Share (EPS) - Weighted-Average Shares Used to Calculate Basic and Diluted EPS (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Basic shares (in shares)	67,625	67,557	67,618	67,547
Dilutive shares (in shares)	168	150	153	130
Diluted shares (in shares)	67,793	67,707	67,771	67,677

Earnings Per Share (EPS) - We87

Earnings Per Share (EPS) - Weighted-Average Antidilutive Stock Awards Excluded from Determining Diluted EPS (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Weighted-average antidilutive stock awards	0	1	2	1

Statements of Cash Flows (Detai

Statements of Cash Flows (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Statement of cash flows specific transaction amounts [Abstract]
Income taxes paid		$ 24,646	$ 15,291
Interest expense paid on deposits and borrowings		17,132	14,639
Noncash transfers from loans to other real estate	[1]	$ 21,972	$ 26,196
[1]	Includes transfers from covered loans to covered other real estate.

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Mar. 11, 2016
Stockholders Equity [Line items]
Capital conservation buffer rate	0.625%	0.625%
Capital requirements phase-in period		1 year
Stock Repurchase Program
Stockholders Equity [Line items]
Amount of stock authorized for repurchase			$ 100
Repurchase shares of common stock	0	34,000

Shareholders' Equity - Table of

Shareholders' Equity - Table of Actual Regulatory Capital Amounts and Ratios (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Trustmark Corporation [Member] | Common Equity Tier 1 Capital (to Risk Weighted Assets) [Member]
Common Equity Tier One Risk Based Capital [Abstract]
Actual Regulatory Capital Amount		$ 1,194,729	$ 1,161,598
Actual Regulatory Capital Ratio		12.35%	12.57%
Minimum Regulatory Capital Required Ratio		5.125%	4.50%
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark Corporation [Member] | Tier 1 Capital (to Risk Weighted Assets) [Member]
Tier 1 Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,254,453	$ 1,220,535
Actual Regulatory Capital Ratio		12.97%	13.21%
Minimum Regulatory Capital Required Ratio		6.625%	6.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark Corporation [Member] | Total Capital (to Risk Weighted Assets) [Member]
Total Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,336,704	$ 1,300,146
Actual Regulatory Capital Ratio		13.82%	14.07%
Minimum Regulatory Capital Required Ratio		8.625%	8.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark Corporation [Member] | Tier 1 Leverage (to Average Assets) [Member]
Tier 1 Leverage (to Average Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,254,453	$ 1,220,535
Actual Regulatory Capital Ratio		9.92%	10.03%
Minimum Regulatory Capital Required Ratio		4.00%	4.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark National Bank [Member] | Common Equity Tier 1 Capital (to Risk Weighted Assets) [Member]
Common Equity Tier One Risk Based Capital [Abstract]
Actual Regulatory Capital Amount		$ 1,235,923	$ 1,201,113
Actual Regulatory Capital Ratio		12.78%	13.00%
Minimum Regulatory Capital Required Ratio		5.125%	4.50%
Minimum Regulatory Provision to be Well-Capitalized Ratio		6.50%	6.50%
Trustmark National Bank [Member] | Tier 1 Capital (to Risk Weighted Assets) [Member]
Tier 1 Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,235,923	$ 1,201,113
Actual Regulatory Capital Ratio		12.78%	13.00%
Minimum Regulatory Capital Required Ratio		6.625%	6.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio		8.00%	8.00%
Trustmark National Bank [Member] | Total Capital (to Risk Weighted Assets) [Member]
Total Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,318,174	$ 1,280,724
Actual Regulatory Capital Ratio		13.63%	13.86%
Minimum Regulatory Capital Required Ratio		8.625%	8.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio		10.00%	10.00%
Trustmark National Bank [Member] | Tier 1 Leverage (to Average Assets) [Member]
Tier 1 Leverage (to Average Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,235,923	$ 1,201,113
Actual Regulatory Capital Ratio		9.79%	9.89%
Minimum Regulatory Capital Required Ratio		4.00%	4.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio		5.00%	5.00%
[1]	n/a

Shareholders' Equity - Componen

Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Securities available for sale and transferred securities, Before tax amount [Abstract]
Unrealized holding (losses) gains arising during the period, Before tax amount	$ (12,657)	$ 17,872	$ 32,057	$ 13,718
Reclassification adjustment for net losses realized in net income, Before tax amount			310
Change in net unrealized holding loss on securities transferred to held to maturity, Before tax amount	2,677	1,678	8,374	4,747
Total securities available for sale and transferred securities, Before tax amount	(9,980)	19,550	40,741	18,465
Securities available for sale and transferred securities, Tax (expense) benefit [Abstract]
Unrealized holding (losses) gains arising during the period, Tax (expense) benefit	4,841	(6,837)	(12,261)	(5,248)
Reclassification adjustment for net gains realized in net income, Tax (expense) benefit			(119)
Change in net unrealized holding loss on securities transferred to held to maturity, Tax (expense) benefit	(1,024)	(642)	(3,203)	(1,816)
Total securities available for sale and transferred securities, Tax (expense) benefit	3,817	(7,479)	(15,583)	(7,064)
Securities available for sale and transferred securities, Net of tax amount [Abstract]
Net unrealized holding (losses) gains on AFS Securities, net of tax at date of transfer	(7,816)	11,035	19,796	8,470
Less: adjustment for net losses realized in net income	0	0	191	0
Change in net unrealized holding loss on securities transferred to held to maturity, after tax income (expense)	1,653	1,036	5,171	2,931
Total securities available for sale and transferred securities, after tax income (expense)	(6,163)	12,071	25,158	11,401
Pension and other postretirement benefit plans, Before tax amount [Abstract]
Net change in prior service costs, before tax amount	63	63	188	188
Recognized net loss due to lump sum settlements, before tax amount	463	603	3,134	1,499
Change in net actuarial loss, before tax amount	928	1,216	2,684	3,653
Reclassification related to net losses realized in net income, before tax amount	1,454	1,882	6,006	5,340
Pension and other postretirement benefit plans, Tax (expense) benefit [Abstract]
Net change in prior service costs, tax (expense) benefit	(24)	(24)	(72)	(72)
Recognized net loss due to lump sum settlements, tax (expense) benefit	(177)	(230)	(1,199)	(573)
Change in net actuarial loss, tax (expense) benefit	(355)	(465)	(1,026)	(1,397)
Reclassification related to net losses realized in net income, tax (expense) benefit	(556)	(719)	(2,297)	(2,042)
Pension and other postretirement benefit plans, Net of tax amount [Abstract]
Net change in prior service costs	39	39	116	116
Recognized net loss due to lump sum settlements, after tax income (expense)	286	373	1,935	926
Change in net actuarial loss, after tax income (expense)	573	751	1,658	2,256
Reclassification related to net losses realized in net income, after tax income (expense)	898	1,163	3,709	3,298
Cash flow hedge derivatives, Before tax amount [Abstract]
Change in accumulated loss on effective cash flow hedge derivatives, before tax amount	417	(1,216)	(1,360)	(1,919)
Reclassification adjustment for loss realized in net income, before tax amount	157	211	473	632
Total cash flow hedge derivatives, before tax benefit	574	(1,005)	(887)	(1,287)
Total other comprehensive (loss) income, Before tax amount	(7,952)	20,427	45,860	22,518
Cash flow hedge derivatives, Tax (expense) benefit [Abstract]
Change in accumulated loss on effective cash flow hedge derivatives, tax (expense) benefit	(160)	465	520	734
Reclassification adjustment for loss realized in net income, tax (expense) benefit	(60)	(81)	(181)	(242)
Total cash flow hedge derivatives, tax (expense) benefit	(220)	384	339	492
Total other comprehensive (loss) income, Tax expense (benefit)	3,041	(7,814)	(17,541)	(8,614)
Cash flow hedge derivatives, Net of tax amount [Abstract]
Change in the accumulated loss on effective cash flow hedge derivatives, after tax amount	257	(751)	(840)	(1,185)
Less: adjustment for loss realized in net income	97	130	292	390
Total cash flow hedge derivatives, after tax amount	354	(621)	(548)	(795)
Total other comprehensive (loss) income, Net of tax	$ (4,911)	$ 12,613	$ 28,319	$ 13,904

Shareholders' Equity - Changes

Shareholders' Equity - Changes in Balances of Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 1,473,057	$ 1,419,940
Other comprehensive income (loss) before reclassification			24,127	13,514
Amounts reclassified from accumulated other comprehensive loss			4,192	390
Total other comprehensive (loss) income, Net of tax	$ (4,911)	$ 12,613	28,319	13,904
Balance	1,534,761	1,476,756	1,534,761	1,476,756
Securities Available for Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(17,394)	(11,003)
Other comprehensive income (loss) before reclassification			24,967	11,401
Amounts reclassified from accumulated other comprehensive loss			191
Total other comprehensive (loss) income, Net of tax			25,158	11,401
Balance	7,764	398	7,764	398
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(27,840)	(31,617)
Other comprehensive income (loss) before reclassification				3,298
Amounts reclassified from accumulated other comprehensive loss			3,709
Total other comprehensive (loss) income, Net of tax			3,709	3,298
Balance	(24,131)	(28,319)	(24,131)	(28,319)
Cash Flow Hedge Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(160)	136
Other comprehensive income (loss) before reclassification			(840)	(1,185)
Amounts reclassified from accumulated other comprehensive loss			292	390
Total other comprehensive (loss) income, Net of tax			(548)	(795)
Balance	(708)	(659)	(708)	(659)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(45,394)	(42,484)
Balance	$ (17,075)	$ (28,580)	$ (17,075)	$ (28,580)

Fair Value - Financial Assets a

Fair Value - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 2,410,947	$ 2,345,422
Loans held for sale	242,097	160,189
Mortgage servicing rights	65,514	74,007	$ 69,809	$ 64,358
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	124,641	138,609
Asset-Backed Securities and Structured Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		24,957
Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,410,947	2,345,422
Loans held for sale	242,097	160,189
Mortgage servicing rights	65,514	74,007
Other assets - derivatives	7,901	3,611
Other liabilities - derivatives	8,583	3,929
Recurring Basis [Member] | US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	58,517	68,416
Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	124,641	138,609
Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,227,789	2,113,440
Recurring Basis [Member] | Asset-Backed Securities and Structured Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		24,957
Level 1 [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Loans held for sale	0	0
Mortgage servicing rights	0	0
Other assets - derivatives	(25)	(149)
Other liabilities - derivatives	808	1,220
Level 1 [Member] | Recurring Basis [Member] | US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 1 [Member] | Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 1 [Member] | Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 1 [Member] | Recurring Basis [Member] | Asset-Backed Securities and Structured Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0
Level 2 [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,410,947	2,345,422
Loans held for sale	242,097	160,189
Mortgage servicing rights	0	0
Other assets - derivatives	5,179	2,647
Other liabilities - derivatives	7,775	2,709
Level 2 [Member] | Recurring Basis [Member] | US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	58,517	68,416
Level 2 [Member] | Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	124,641	138,609
Level 2 [Member] | Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,227,789	2,113,440
Level 2 [Member] | Recurring Basis [Member] | Asset-Backed Securities and Structured Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		24,957
Level 3 [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Loans held for sale	0	0
Mortgage servicing rights	65,514	74,007
Other assets - derivatives	2,747	1,113
Other liabilities - derivatives	0	0
Level 3 [Member] | Recurring Basis [Member] | US Treasury and Government [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 3 [Member] | Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 3 [Member] | Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 0	0
Level 3 [Member] | Recurring Basis [Member] | Asset-Backed Securities and Structured Financial Products [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		$ 0

Fair Value - Changes in Level 3

Fair Value - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Recurring Basis [Member] - Level 3 [Member] - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
MSR [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 74,007	$ 64,358
Total net (loss) gain included in Mortgage banking, net	[1]	(20,885)	(7,869)
Additions		12,392	13,320
Sales		0	0
Ending Balance		65,514	69,809
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held, end of period		(13,519)	(433)
Other Assets - Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		1,113	1,299
Total net (loss) gain included in Mortgage banking, net	[1]	9,486	6,193
Additions		0	0
Sales		(7,852)	(4,786)
Ending Balance		2,747	2,706
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held, end of period		$ 904	$ (169)
[1]	Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off.

Fair Value - Additional Informa

Fair Value - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)Region	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)Region	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Nonfinancial Assets and Liabilities [Abstract]
Outstanding balances in impaired loans	$ 28.6		$ 28.6		$ 26.5
Key market regions | Region	5		5
Foreclosed assets measured at fair value			$ 22	$ 26.8
Allowance for possible loan losses, Charge-offs for foreclosed assets upon initial recognition			19.8	7.4
Foreclosed assets re-measured after initial recognition			26.5	39.4
Write-downs of allowance for foreclosed assets after initial recognition			3.7	2.4
Noninterest gain (loss) Mortgage banking, net for changes in fair value of LHFS	$ (1.1)	$ 3.6	2.6	1.7
Interest earned on LHFS included in Interest and fees on LHFS and LHFI	1.5	$ 1.4	3.7	$ 3.7
GNMA optional repurchase loans	$ 37.3		$ 37.3		$ 36
Maximum [Member]
Nonfinancial Assets and Liabilities [Abstract]
Estimated fair value of financial instruments with immediate and shorter-term maturities			90 days

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity	$ 1,143,234	$ 1,187,818
Net LHFI	7,428,333	7,023,766
FDIC indemnification asset	0	738
Deposits	9,685,701	9,588,230
Long-term FHLB advances	751,075	501,155
Subordinated notes	49,993	49,969
Junior subordinated debt securities	61,856	61,856
Level 2 [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	384,445	278,001
Securities held to maturity	1,143,234	1,187,818
Deposits	9,685,701	9,588,230
Short-term liabilities	927,710	853,659
Long-term FHLB advances	751,075	501,155
Subordinated notes	49,993	49,969
Junior subordinated debt securities	61,856	61,856
Level 2 [Member] | Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	384,445	278,001
Securities held to maturity	1,173,101	1,195,367
Deposits	9,689,282	9,592,531
Short-term liabilities	927,710	853,659
Long-term FHLB advances	751,077	501,160
Subordinated notes	50,484	51,405
Junior subordinated debt securities	40,825	49,021
Level 3 [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI	7,428,333	7,023,766
Acquired loans	284,357	378,419
FDIC indemnification asset	0	738
Level 3 [Member] | Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI	7,493,082	7,136,105
Acquired loans	284,357	378,419
FDIC indemnification asset	$ 0	$ 738

Fair Value - Fair Value and the

Fair Value - Fair Value and the Contractual Principal Outstanding of the LHFS (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair value and the contractual principal outstanding of the LHFS [Abstract]
Fair value of LHFS	$ 204,839	$ 124,165
LHFS contractual principal outstanding	198,288	121,608
Fair value less unpaid principal	$ 6,551	$ 2,557

Derivative Financial Instrume98

Derivative Financial Instruments - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016USD ($)Contract	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)Contract	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)Contract	Apr. 04, 2013USD ($)
Designated as Hedging Instrument [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Accumulated net, after tax (loss) gain included in other comprehensive loss	$ 257,000	$ (751,000)	$ (840,000)	$ (1,185,000)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Period for which cash flow hedges will be used to hedge quarterly interest payments			5 years
Derivative inception date			Dec. 31, 2014
Derivative maturity date			Dec. 31, 2019
Description of variable rate basis for derivative			three-month LIBOR
Ineffectiveness related to interest rate swap designated as a cash flow hedge			$ 0	0
Accumulated net, after tax (loss) gain included in other comprehensive loss			$ (708,000)		$ (160,000)
The period over which OCI will be reclassified as interest expense			12 months
Estimated amount to be reclassified as an increase to interest expense	$ 442,000		$ 442,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Junior Subordinated Debentures [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount						$ 60,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Three-month LIBOR [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Swap fixed interest rate to be paid	1.66%		1.66%
Derivatives not Designated as Hedging Instruments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	$ 338,500,000		$ 338,500,000		$ 264,500,000
Net (negative) positive ineffectiveness on MSR fair value	$ (1,200,000)	$ 479,000	$ (2,700,000)	$ 3,900,000
Derivatives not Designated as Hedging Instruments [Member] | Beneficiary [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	2		2		2
Aggregate notional amount of credit risk participation agreements	$ 14,300,000		$ 14,300,000		$ 14,800,000
Derivatives not Designated as Hedging Instruments [Member] | Guarantor [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	5		5		1
Aggregate notional amount of credit risk participation agreements	$ 28,600,000		$ 28,600,000		$ 5,900,000
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	350,300,000		350,300,000		359,300,000
Termination value of derivatives	5,900,000		5,900,000		2,600,000
Collateral Posted	5,800,000		5,800,000
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	301,500,000		301,500,000		190,500,000
Valuation adjustment			(1,200,000)		262,000
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Lock Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	$ 195,700,000		195,700,000		108,100,000
Valuation adjustment			$ 2,700,000		$ 1,100,000

Derivative Financial Instrume99

Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	$ 5,151	$ 2,629
Fair value of derivative liability	6,570	2,954
Derivatives in Hedging Relationships [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	(1,147)	(259)
Derivatives not Designated as Hedging Instruments [Member] | Future Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	(199)	(207)
Derivatives not Designated as Hedging Instruments [Member] | Credit Risk Participation Agreement [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	28	18
Derivatives not Designated as Hedging Instruments [Member] | Credit Risk Participation Agreement [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	35	17
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	1,170	(262)
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	6,298	2,888
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	6,570	2,954
Derivatives not Designated as Hedging Instruments [Member] | Exchange Traded Purchased Options [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	174	58
Derivatives not Designated as Hedging Instruments [Member] | OTC Written Options (Rate Locks) [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	2,747	1,113
Derivatives not Designated as Hedging Instruments [Member] | Exchange Traded Written Options [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	$ 808	$ 1,220

Derivative Financial Instrum100

Derivative Financial Instruments - Effects of Derivative Instruments on Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivatives in Hedging Relationships [Member] | Accumulated Other Comprehensive Loss and Other Interest Expense [Member]
Derivatives, Fair Value [Line Items]
Amount of loss reclassified from accumulated other comprehensive loss and recognized in other interest expense	$ (157)	$ (211)	$ (473)	$ (632)
Derivatives not Designated as Hedging Instruments [Member] | Mortgage Banking, Net [Member]
Derivatives, Fair Value [Line Items]
Amount of (loss) gain recognized in mortgage banking, net	(688)	1,265	11,042	4,221
Derivatives not Designated as Hedging Instruments [Member] | Bank Card and Other Fees [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in bank card and other fees	$ 1	$ (128)	$ (206)	$ (94)

Derivative Financial Instrum101

Derivative Financial Instruments - Schedule of Amount Included in Other Comprehensive Income for Derivative Instruments Designated as Hedges of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivatives in Hedging Relationships [Member]
Derivatives in cash flow hedging relationship
Amount of gain (loss) recognized in other comprehensive income (loss), net of tax	$ 257	$ (751)	$ (840)	$ (1,185)

Derivative Financial Instrum102

Derivative Financial Instruments - Information about Financial Instruments that are Eligible for Offset in the Consolidated Balance Sheets (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Offsetting Derivative Assets
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets	$ 5,151	$ 2,629
Gross Amounts Offset in the Statement of Financial Position, Offsetting of Derivative Assets	0	0
Net Amounts of Assets presented in the Statement of Financial Position, Offsetting of Derivative Assets	5,151	2,629
Cash Collateral Received, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets	0	0
Net Amount, Offsetting of Derivative Assets	5,151	2,629
Offsetting Derivative Liabilities
Other liabilities - derivatives	6,570	2,954
Gross Amounts Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	0	0
Net Amounts of Liabilities presented in the Statement of Financial Position, Offsetting of Derivative Liabilities	6,570	2,954
Cash Collateral Posted, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	(4,932)	(1,195)
Net Amount, Offsetting of Derivative Liabilities	$ 1,638	$ 1,759

Segment Information - Additiona

Segment Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 2016Segment
Segment Reporting [Abstract]
Number of segments in which the business operates	3

Segment Information - Schedule

Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net interest income	$ 97,564	$ 97,606	$ 288,681	$ 291,947
Provision for loan losses, net	4,975	3,770	11,730	7,760
Noninterest income	44,716	45,973	132,219	133,879
Noninterest expense	97,908	103,560	307,031	303,042
Income Before Income Taxes	39,397	36,249	102,139	115,024
Income taxes	8,415	7,819	22,651	26,844
Net Income	30,982	28,430	79,488	88,180
Selected Financial Information
Average assets	13,000,217	12,313,777	12,854,230	12,184,803
Depreciation and amortization	9,504	9,466	27,183	27,995
General Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	97,395	97,408	287,950	291,483
Provision for loan losses, net	4,975	3,770	11,730	7,760
Noninterest income	27,207	28,320	81,230	82,477
Noninterest expense	84,358	90,043	267,063	262,403
Income Before Income Taxes	35,269	31,915	90,387	103,797
Income taxes	6,844	6,207	18,168	22,588
Net Income	28,425	25,708	72,219	81,209
Selected Financial Information
Average assets	12,916,011	12,231,450	12,788,736	12,123,213
Depreciation and amortization	9,274	9,209	26,483	27,256
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income	119	91	571	194
Noninterest income	7,434	7,748	22,681	23,477
Noninterest expense	6,216	6,195	18,200	19,373
Income Before Income Taxes	1,337	1,644	5,052	4,298
Income taxes	512	629	1,933	1,644
Net Income	825	1,015	3,119	2,654
Selected Financial Information
Average assets	6,039	4,181	1,842	3,020
Depreciation and amortization	44	44	131	139
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income	50	107	160	270
Noninterest income	10,075	9,905	28,308	27,925
Noninterest expense	7,334	7,322	21,768	21,266
Income Before Income Taxes	2,791	2,690	6,700	6,929
Income taxes	1,059	983	2,550	2,612
Net Income	1,732	1,707	4,150	4,317
Selected Financial Information
Average assets	78,167	78,146	63,652	58,570
Depreciation and amortization	$ 186	$ 213	$ 569	$ 600