Pinnacle Financial Partners (PNFP) 10-K 28 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 23, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	PINNACLE FINANCIAL PARTNERS INC
Entity Central Index Key	1,115,055
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 4,684,907,318
Entity Common Stock, Shares Outstanding		77,887,015
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and noninterest-bearing due from banks	$ 176,553,466	$ 84,732,291
Interest-bearing due from banks	496,911,376	97,529,713
Federal funds sold and other	106,132,455	1,383,416
Cash and cash equivalents	779,597,297	183,645,420
Securities available-for-sale, at fair value	2,515,283,219	1,298,546,056
Securities held-to-maturity (fair value of $20,829,978 and $25,233,254 at December 31, 2017 and December 31, 2016, respectively)	20,762,303	25,251,316
Mortgage loans held-for-sale	103,728,658	47,710,120
Commercial loans held-for-sale	25,456,141	22,587,971
Loans	15,633,116,029	8,449,924,736
Less allowance for loan losses	(67,240,094)	(58,980,475)
Loans, net	15,565,875,935	8,390,944,261
Premises and equipment, net	266,013,608	88,904,145
Equity method investment	221,667,490	205,359,844
Accrued interest receivable	57,439,656	28,234,826
Goodwill	1,808,001,781	551,593,796
Core deposits and other intangible assets	56,710,268	15,104,038
Other real estate owned	27,830,824	6,089,804
Other assets	757,332,667	330,651,002
Total assets	22,205,699,847	11,194,622,599
Deposits:
Non-interest-bearing	4,381,386,246	2,399,191,152
Interest-bearing	2,987,290,844	1,808,331,784
Savings and money market accounts	6,548,964,272	3,714,930,351
Time	2,534,060,910	836,853,761
Total deposits	16,451,702,272	8,759,307,048
Securities sold under agreements to repurchase	135,262,140	85,706,558
Federal Home Loan Bank advances	1,319,908,629	406,304,187
Subordinated debt and other borrowings	465,504,589	350,768,050
Accrued interest payable	10,480,426	5,573,377
Other liabilities	114,889,760	90,267,267
Total liabilities	18,497,747,816	9,697,926,487
Stockholders' equity:
Preferred stock, no par value; 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, par value $1.00; 90,000,000 shares authorized; 77,739,636 and 46,359,377 issued and outstanding at December 31, 2017 and 2016	77,739,636	46,359,377
Additional paid-in capital	3,115,303,675	1,083,490,728
Retained earnings	519,144,543	381,072,505
Accumulated other comprehensive loss, net of taxes	(4,235,823)	(14,226,498)
Total stockholders' equity	3,707,952,031	1,496,696,112
Total liabilities and stockholders' equity	$ 22,205,699,847	$ 11,194,622,599

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Securities held-to-maturity, fair value	$ 20,829,978	$ 25,233,254
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, shares issued (in shares)	77,739,636	46,359,377
Common stock, shares outstanding (in shares)	77,739,636	46,359,377

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income:
Loans, including fees	$ 578,286,155	$ 335,734,531	$ 232,847,334
Securities:
Taxable	39,060,195	19,179,012	15,060,392
Tax-exempt	13,711,759	6,014,037	5,783,443
Federal funds sold and other	5,080,140	2,681,348	1,478,711
Total interest income	636,138,249	363,608,928	255,169,880
Interest expense:
Deposits	59,583,527	23,917,318	13,209,425
Securities sold under agreements to repurchase	405,837	185,305	138,347
Federal Home Loan Bank advances and other borrowings	32,841,874	14,512,024	5,189,193
Total interest expense	92,831,238	38,614,647	18,536,965
Net interest income	543,307,011	324,994,281	236,632,915
Provision for loan losses	23,663,944	18,328,058	9,188,497
Net interest income after provision for loan losses	519,643,067	306,666,223	227,444,418
Noninterest income:
Service charges on deposit accounts	20,032,979	14,500,679	12,745,742
Investment services	14,315,228	10,757,348	9,971,313
Insurance sales commissions	7,404,928	5,309,494	4,824,007
Gains on mortgage loans sold, net	(18,624,621)	(15,754,473)	(7,668,960)
Investment gains (losses) on sales, net	(8,264,639)	395,186	552,063
Trust fees	8,663,590	6,328,021	5,461,257
Income from equity method investment	37,957,692	31,402,923	20,591,484
Other noninterest income	46,168,416	36,554,938	24,715,442
Total noninterest income	144,902,815	121,003,062	86,530,268
Noninterest expense:
Salaries and employee benefits	209,661,812	140,818,772	105,928,914
Equipment and occupancy	54,091,964	35,071,654	27,241,477
Other real estate expense (benefit), net	1,079,193	395,561	(305,956)
Marketing and other business development	8,321,073	6,536,484	4,863,307
Postage and supplies	5,735,716	3,929,323	3,228,300
Amortization of intangibles	8,815,609	4,281,459	1,973,953
Merger related expenses	31,843,413	11,746,584	4,797,018
Other noninterest expense	47,011,079	33,505,586	23,149,743
Total noninterest expense	366,559,859	236,285,423	170,876,756
Income before income taxes	297,986,023	191,383,862	143,097,930
Income tax expense	124,006,536	64,159,167	47,588,528
Net income	$ 173,979,487	$ 127,224,695	$ 95,509,402
Per share information:
Basic net income per common share	$ 2.73	$ 2.96	$ 2.58
Diluted net income per common share	$ 2.70	$ 2.91	$ 2.52
Weighted average common shares outstanding:
Basic	63,760,578	43,037,083	37,015,468
Diluted	64,328,189	43,731,992	37,973,788

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income:	$ 173,979,487	$ 127,224,695	$ 95,509,402
Other comprehensive income (loss), net of tax:
Total other comprehensive income (loss), net of tax	9,990,675	(10,741,276)	(7,643,590)
Changes in fair value of cash flow hedges, net of tax	2,139,703	(800,188)	(1,725,136)
Changes in fair value on available-for-sale securities, net of tax	2,828,551	(9,700,933)	(5,582,965)
Net loss (gain) on sale of investment securities reclassified from other comprehensive income into net income, net of tax	5,022,421	(240,155)	(335,489)
Total comprehensive income	$ 183,970,162	$ 116,483,419	$ 87,865,812

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Bankers Healthcare Group, LLC [Member]	Avenue Financial Holdings, Inc. (Avenue) [Member]	CapitalMark Bank & Trust [Member]	Magna Bank [Member]	Bank of North Carolina [Member]	Common Stock [Member]	Common Stock [Member]Bankers Healthcare Group, LLC [Member]	Common Stock [Member]Avenue Financial Holdings, Inc. (Avenue) [Member]	Common Stock [Member]CapitalMark Bank & Trust [Member]	Common Stock [Member]Magna Bank [Member]	Common Stock [Member]Bank of North Carolina [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]Bankers Healthcare Group, LLC [Member]	Additional Paid-in Capital [Member]Avenue Financial Holdings, Inc. (Avenue) [Member]	Additional Paid-in Capital [Member]CapitalMark Bank & Trust [Member]	Additional Paid-in Capital [Member]Magna Bank [Member]	Additional Paid-in Capital [Member]Bank of North Carolina [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Balance at Dec. 31, 2014	$ 802,693,381						$ 35,732,483						$ 561,431,449						$ 201,371,081	$ 4,158,368
Balance (in shares) at Dec. 31, 2014							35,732,483
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee common stock options, stock appreciation rights, and related tax benefits	$ 7,491,942						$ 304,313						7,187,629
Exercise of employee common stock options, stock appreciation rights, and related tax benefits (in shares)	303,754						304,313
Issuance of restricted common shares, net of forfeitures	$ 0						$ 257,218						(257,218)
Issuance of restricted common shares, net of forfeitures (in shares)							257,218
Common stock issued in conjunction with acquisition	269,492,990			$ 205,955,059	$ 63,537,931					$ 3,306,184	$ 1,371,717					$ 202,648,875	$ 62,166,214
Common stock issued in conjunction with acquisition (in shares)										3,306,184	1,371,717
Restricted shares withheld for taxes	(967,353)						$ (65,851)						(901,502)
Restricted shares withheld for taxes (in shares)							(65,851)
Compensation expense for restricted shares	7,341,603												7,341,603
Common dividends paid	(18,307,075)																		(18,307,075)
Net income	95,509,402																		95,509,402
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(7,643,590)																			(7,643,590)
Balance at Dec. 31, 2015	1,155,611,300						$ 40,906,064						839,617,050						278,573,408	(3,485,222)
Balance (in shares) at Dec. 31, 2015							40,906,064
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee common stock options, stock appreciation rights, and related tax benefits	$ 17,436,175						$ 699,810						16,736,365
Exercise of employee common stock options, stock appreciation rights, and related tax benefits (in shares)	698,673						699,810
Issuance of restricted common shares, net of forfeitures	$ 0						$ 200,098						(200,098)
Issuance of restricted common shares, net of forfeitures (in shares)							200,098
Common stock issued in conjunction with acquisition	222,162,640	$ 39,694,036	$ 182,468,604					$ 860,470	$ 3,760,326					$ 38,833,566	$ 178,708,278
Common stock issued in conjunction with acquisition (in shares)								860,470	3,760,326
Restricted shares withheld for taxes	(1,242,673)						$ (67,391)						(1,175,282)
Restricted shares withheld for taxes (in shares)							(67,391)
Compensation expense for restricted shares	10,970,849												10,970,849
Common dividends paid	(24,725,598)																		(24,725,598)
Net income	127,224,695																		127,224,695
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(10,741,276)																			(10,741,276)
Balance at Dec. 31, 2016	1,496,696,112						$ 46,359,377						1,083,490,728						381,072,505	(14,226,498)
Balance (in shares) at Dec. 31, 2016							46,359,377
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee common stock options, stock appreciation rights, and related tax benefits	$ 5,484,622						$ 275,431						5,209,191
Exercise of employee common stock options, stock appreciation rights, and related tax benefits (in shares)	275,904						275,431
Issuance of restricted common shares, net of forfeitures	$ 0						$ 271,602						(271,602)
Stock Issued During Period, Value, Other	192,193,750						$ 3,220,000						188,973,750
Issuance of restricted common shares, net of forfeitures (in shares)							271,602
Common stock issued in conjunction with acquisition	1,850,968,026					$ 1,850,968,026						$ 27,687,100						$ 1,823,280,926
Common stock issued in conjunction with acquisition (in shares)												27,687,100
Restricted shares withheld for taxes	(4,991,275)						$ (73,874)						(4,917,401)
Restricted shares withheld for taxes (in shares)							(73,874)
Compensation expense for restricted shares	19,538,083												19,538,083
Common dividends paid	(35,907,449)																		(35,907,449)
Net income	173,979,487																		173,979,487
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	9,990,675																			9,990,675
Balance at Dec. 31, 2017	$ 3,707,952,031						$ 77,739,636						$ 3,115,303,675						$ 519,144,543	$ (4,235,823)
Balance (in shares) at Dec. 31, 2017							77,739,636

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities:
Net income	$ 173,979,487	$ 127,224,695	$ 95,509,402
Adjustments to reconcile net income to net cash provided by operating activities:
Net amortization/accretion of premium/discount on securities	12,846,572	8,630,048	5,231,583
Depreciation, amortization and accretion	(23,618,474)	16,995,490	10,268,576
Provision for loan losses	23,663,944	18,328,058	9,188,497
Gains on mortgage loans sold, net	(18,624,621)	(15,754,473)	(7,668,960)
Gain (Loss) on Sale of Investments	8,264,639	(395,186)	(552,063)
Stock-based compensation expense	19,538,083	10,970,849	7,341,603
Deferred tax expense excluding expense associated with revaluation of deferred tax assets/liabilities	28,164,871	14,390,035	5,819,463
Deferred tax asset/liability revaluation	31,485,672	0	0
Losses (gains) on disposition of other real estate and other investments	(202,980)	140,992	(433,911)
Income from equity method investment	(37,957,692)	(31,402,923)	(20,591,484)
Excess tax benefit from stock compensation	(5,365,493)	(4,604,007)	(4,116,120)
Gains on other loans sold, net	(1,488,140)	(885,320)	0
Other loans held for sale:
Other loans held for sale originated	(177,433,682)	(112,669,589)	0
Other loans held for sale sold	176,062,619	90,966,938	0
Mortgage loans held for sale:
Mortgage loans held for sale originated	(1,100,866,370)	(784,213,817)	(524,679,767)
Mortgage loans held for sale sold	1,090,489,558	803,498,453	519,134,000
Increase in other assets	(33,297,361)	(17,411,223)	(2,359,490)
(Decrease) increase in other liabilities	(17,699,526)	2,829,656	(7,487,499)
Net cash provided by operating activities	147,941,106	126,638,676	84,603,830
Activities in securities available-for-sale:
Purchases	(1,290,716,532)	(583,330,035)	(342,192,699)
Sales	363,898,141	72,829,440	189,029,458
Maturities, prepayments and calls	323,235,144	280,805,769	146,441,236
Activities in securities held-to-maturity:
Purchases	0	(560,000)	(1,550,995)
Maturities, prepayments and calls	4,115,000	6,200,000	8,185,000
Increase in loans, net	(1,558,646,425)	(966,207,993)	(668,297,036)
Purchases of premises and equipment and software	(53,498,776)	(17,058,292)	(10,870,851)
Payments to Acquire Life Insurance Policies	(55,000,000)	0	0
Proceeds from sales of software, premises, and equipment	23,038	2,187,381	782,482
Proceeds from sale of mortgage servicing rights	0	6,747,626	0
Acquisitions, net of cash acquired	155,141,674	17,608,471	5,876,592
Increase in equity method investment	0	(74,100,000)	(75,440,530)
Dividends received from equity method investment	21,650,046	28,982,009	7,152,000
Increase in other investments	(7,804,237)	(27,508,882)	(1,712,685)
Net cash used in investing activities	(2,097,602,927)	(1,253,404,506)	(742,598,028)
Financing activities:
Net increase in deposits	1,488,273,894	822,306,826	783,352,902
Net increase (decrease) in repurchase agreements	(12,754,500)	6,622,260	(32,784,245)
Advances from Federal Home Loan Bank:
Issuances	1,964,750,001	1,934,000,000	1,135,000,000
Payments	(1,051,066,604)	(1,934,093,153)	(1,092,781,984)
Proceeds from subordinated debt and other borrowings, net of issuance costs	0	243,226,783	59,129,504
Repayment of other borrowings	(220,100)	(74,000,302)	(50,290,006)
Principal payments of capital lease obligation	(148,641)	(70,401)	0
Proceeds from Issuance of Common Stock	192,193,750	0	0
Exercise of common stock options and stock appreciation rights, net of shares surrendered for taxes	493,347	11,589,495	3,602,805
Excess tax benefit from stock compensation	0	4,604,007	4,116,120
Common dividends paid	(35,907,449)	(24,725,598)	(18,307,075)
Net cash provided by financing activities	2,545,613,698	989,459,917	791,038,021
Net increase (decrease) in cash and cash equivalents	595,951,877	(137,305,913)	133,043,823
Cash and cash equivalents, beginning of year	183,645,420	320,951,333	187,907,510
Cash and cash equivalents, end of year	$ 779,597,297	$ 183,645,420	$ 320,951,333

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1. Summary of Significant Accounting Policies Nature of Business — Pinnacle Financial Partners, Inc. (Pinnacle Financial) is a bank holding company whose primary business is conducted by its wholly-owned subsidiary, Pinnacle Bank (Pinnacle Bank). Pinnacle Bank is a commercial bank headquartered in Nashville, Tennessee. Pinnacle Financial completed its acquisitions of CapitalMark Bank & Trust (CapitalMark), Magna Bank (Magna), Avenue Financial Holdings, Inc. (Avenue) and BNC Bancorp (BNC) on July 31, 2015, September 1, 2015, July 1, 2016 and June 16, 2017, respectively. Pinnacle Financial and Pinnacle Bank also collectively hold a 49% interest in Bankers Healthcare Group, LLC (BHG), a full-service commercial loan provider to healthcare and other professional practices. Pinnacle Bank provides a full range of banking services, including investment, mortgage, and insurance services, and comprehensive wealth management services, in its 11 primarily urban markets within Tennessee, the Carolinas and Virginia. Basis of Presentation — These consolidated financial statements include the accounts of Pinnacle Financial and its wholly-owned subsidiaries. Certain statutory trust affiliates of Pinnacle Financial, as noted in Note 11. Other Borrowings are included in these consolidated financial statements pursuant to the equity method of accounting. Significant intercompany transactions and accounts are eliminated in consolidation. Use of Estimates — The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the balance sheet dates and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term include the determination of the allowance for loan losses, determination of any impairment of intangible assets and the valuation of deferred tax assets. Impairment — Long-lived assets, including purchased intangible assets subject to amortization, such as core deposit intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. Pinnacle Financial had $56.7 million and $15.1 million of long-lived amortizing intangibles at December 31, 2017 and 2016 , respectively. Goodwill is evaluated for impairment at least annually and more frequently if events and circumstances indicate that the asset might be impaired. The Accounting Standards Codification (ASC) 350, Goodwill and Other , regarding testing goodwill for impairment provides an entity the option to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an entity does a qualitative assessment and determines that this is the case, or if a qualitative assessment is not performed, it is required to perform additional goodwill impairment testing to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized for that reporting unit (if any). Based on a qualitative assessment, if an entity determines that the fair value of a reporting unit is more than its carrying amount, the two-step goodwill impairment test is not required. Pinnacle Financial performed its annual assessment as of September 30, 2017. The results of the qualitative assessment indicated that the fair value of Pinnacle Financial's sole reporting unit was more than its carrying value, and accordingly, the two-step goodwill impairment test was not performed. Should Pinnacle Financial's common stock price decline or other impairment indicators become known, additional impairment testing of goodwill may be required. Should it be determined in a future period that the goodwill has become impaired, then a charge to earnings will be recorded in the period such determination is made. The following table presents activity for goodwill and other intangible assets (in thousands): Goodwill Core deposit and other intangible assets Total Balance at December 31, 2016 $ 551,594 $ 15,104 $ 566,698 Acquisitions 1,256,455 50,422 1,306,877 Amortization — (8,816 ) (8,816 ) Change in purchase price allocation of previous acquisitions — — — Other changes (1) (47 ) — (47 ) Balance at December 31, 2017 $ 1,808,002 $ 56,710 $ 1,864,712 (1) Represents options exercised related to acquisitions which occurred prior to the adoption of ASC 718-20 Compensation . The following table presents the gross carrying amount and accumulated amortization for the core deposit and other intangible assets, which are subject to amortization (in thousands): December 31, 2017 December 31, 2016 Gross carrying amount $ 92,787 $ 42,365 Accumulated amortization (36,077 ) (27,261 ) Net book value $ 56,710 $ 15,104 Cash Equivalents and Cash Flows — Cash on hand, cash items in process of collection, amounts due from banks, Federal funds sold, short-term discount notes and securities purchased under agreements to resell, with original maturities within ninety days, are included in cash and cash equivalents. The following supplemental cash flow information addresses certain cash payments and noncash transactions for each of the years in the three-year period ended December 31, 2017 as follows: For the years ended December 31, 2017 2016 2015 Cash Payments: Interest $ 91,628,041 $ 37,002,870 $ 17,435,292 Income taxes paid 81,538,510 49,503,637 45,715,968 Noncash Transactions: Loans charged-off to the allowance for loan losses 22,046,511 31,112,118 21,148,034 Loans foreclosed upon with repossessions transferred to other real estate 6,227,509 4,453,060 341,342 Loans foreclosed upon with repossessions transferred to other repossessed assets 645,737 1,842,318 8,259,368 Other real estate sales financed 907,931 — — Common stock issued in connection with acquisitions 1,850,968,026 222,162,640 269,492,990 Securities — Securities are classified based on management's intention on the date of purchase. All debt securities classified as available-for-sale are recorded at fair value with any unrealized gains and losses reported in accumulated other comprehensive income (loss), net of the deferred income tax effects. Securities that Pinnacle Financial has both the positive intent and ability to hold to maturity are classified as held-to-maturity and are carried at historical cost and adjusted for amortization of premiums and accretion of discounts. Interest and dividends on securities, including amortization of premiums and accretion of discounts calculated under the effective interest method, are included in interest income. For certain securities, amortization of premiums and accretion of discounts is computed based on the anticipated life of the security which may be shorter than the stated life of the security. Realized gains and losses from the sale of securities are determined using the specific identification method, and are recorded on the trade date of the sale. Other-than-temporary Impairment — A decline in the fair value of any available-for-sale or held-to-maturity security below cost that is deemed to be other-than-temporary results in a reduction in the carrying amount of the security. To determine whether impairment is other-than-temporary, management considers whether the entity expects to recover the entire amortized cost basis of the security by reviewing the present value of the future cash flows associated with the security. The shortfall of the present value of the cash flows expected to be collected in relation to the amortized cost basis is referred to as a credit loss and is deemed to be other-than-temporary impairment. If a credit loss is identified, the credit loss is recognized as a charge to earnings and a new cost basis for the security is established. If management concludes that a decline in fair value of a security is temporary and, a full recovery of principal and interest is expected and it is not more-likely-than-not that it will be required to sell the security before recovery of its amortized cost basis, then the security is not other-than-temporarily impaired and the shortfall is recorded as a component of equity. Periodically, available-for-sale securities may be sold or the composition of the portfolio realigned to improve yields, quality or marketability, or to implement changes in investment or asset/liability strategy, including maintaining collateral requirements and raising funds for liquidity purposes. Additionally, if an available-for-sale security loses its investment grade, tax-exempt status, the underlying credit support is terminated or collection otherwise becomes uncertain based on factors known to management, Pinnacle Financial will consider selling the security, but will review each security on a case-by-case basis as these factors become known. Resultantly, other-than-temporary charges may be incurred as management's intention related to a particular security changes. The carrying values of Pinnacle Financial's investment securities could decline in the future if the financial condition of the securities' issuer deteriorates and management determines it is probable that Pinnacle Financial will not recover the entire amortized cost bases of the securities. As a result, there is a risk that other-than-temporary impairment charges may occur in the future. There is also a risk that other-than-temporary impairment charges may occur in the future if management's intention to hold these securities to maturity and or recovery changes. Loans held-for-sale — Loans originated and intended for sale are carried at the lower of cost or estimated fair value as determined on a loan-by-loan basis. Net unrealized losses, if any, are recognized through a valuation allowance by charges to income. Realized gains and losses are recognized when legal title to the loans has been transferred to the purchaser and sales proceeds have been received and are reflected in the accompanying consolidated statement of income in gains on mortgage loans sold, net of related costs such as compensation expenses, for mortgage loans, and as a component of other noninterest income for commercial loans held-for-sale. Loans — Pinnacle Financial has five loan segments for financial reporting purposes: commercial and industrial, commercial real estate mortgage, construction and land development, consumer and other and consumer real estate mortgage. The appropriate classification is determined based on the underlying collateral utilized to secure each loan. These classifications are consistent with those utilized in the Quarterly Report of Condition and Income filed by Pinnacle Bank with the Federal Deposit Insurance Corporation (FDIC). Loans are reported at their outstanding principal balances, net of the allowance for loan losses and any deferred fees or costs on originated loans. Interest income on loans is accrued based on the principal balance outstanding. Loan origination fees, net of certain loan origination costs, are deferred and recognized as an adjustment to the related loan yield using a method which approximates the interest method. At December 31, 2017 and 2016 , net deferred loan fees of $7.8 million and $7.6 million respectively, were included in loans on the accompanying consolidated balance sheets. As part of our routine credit monitoring process, commercial loans receive risk ratings by the assigned financial advisor and are subject to validation by our independent loan review department. Risk ratings are categorized as pass, special mention, substandard, substandard-nonaccrual or doubtful-nonaccrual. Pinnacle Financial believes that its categories follow those outlined by Pinnacle Bank's primary federal regulator. At December 31, 2017 , approximately 81.4% of Pinnacle Financial's loan portfolio was assigned a specifically assigned risk rating. Certain consumer loans and commercial relationships that possess certain qualifying characteristics, including individually smaller balances, are generally not assigned an individual risk rating but are evaluated collectively for credit risk as a homogeneous pool of loans and individually as either accrual or nonaccrual based on the performance of the loan. Loans are placed on nonaccrual status when there is a significant deterioration in the financial condition of the borrower, which generally is the case but is not limited to when the principal or interest is more than 90 days past due, unless the loan is both well-secured and in the process of collection. All interest accrued but not collected for loans that are placed on nonaccrual status is reversed against current interest income. Interest income is subsequently recognized only if certain cash payments are received while the loan is classified as nonaccrual, but interest income recognition is reviewed on a case-by-case basis to determine if the payment should be applied to interest or principal pursuant to regulatory guidelines. A nonaccrual loan is returned to accruing status once the loan has been brought current as to principal and interest and collection is reasonably assured or the loan has been well-secured through other techniques. All loans that are placed on nonaccrual status are further analyzed to determine if they should be classified as impaired loans. A loan is considered to be impaired when it is probable Pinnacle Financial will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan. This determination is made using a variety of techniques, which include a review of the borrower's financial condition, debt-service coverage ratios, global cash flow analysis, guarantor support, other loan file information, meetings with borrowers, inspection or reappraisal of collateral and/or consultation with legal counsel as well as results of reviews of other similar industry credits (e.g. builder loans, development loans, church loans, etc.). Loans are charged off when management believes that the full collectability of the loan is unlikely. As such, a loan may be partially charged-off after a "confirming event" has occurred which serves to validate that full repayment pursuant to the terms of the loan is unlikely. Purchased Loans — Purchased loans, including loans acquired through a merger, are initially recorded at fair value on the date of purchase. Purchased loans that contain evidence of post-origination credit deterioration as of the purchase date are carried at the net present value of expected future cash flows. All other purchased loans are recorded at their initial fair value, and adjusted for subsequent advances, pay downs, amortization or accretion of any fair value premium or discount on purchase, charge-offs and any other adjustment to carrying value. Pursuant to U.S. generally accepted accounting principles (GAAP), management has up to 12 months following the date of the acquisition to finalize the fair values of acquired assets and assumed liabilities as of the acquisition date. Once management has finalized the fair values of acquired assets and assumed liabilities within this 12-month period, management considers such values to be the day 1 fair values (Day 1 Fair Values). At the time of acquisition, management evaluates all purchased loans using a variety of factors such as current classification or risk rating, past due status and history as a component of the fair value determination. For those purchased loans without evidence of credit deterioration, management evaluates each reviewed loan using an internal grading system with a grade assigned to each loan at the date of acquisition. To the extent that any purchased loan is not specifically reviewed, such loan is assumed to have characteristics similar to the characteristics of the specifically reviewed acquired portfolio of purchased loans. The grade for each purchased loan without evidence of credit deterioration is reviewed subsequent to the date of acquisition any time a loan is renewed or extended or at any time information becomes available to Pinnacle Financial that provides material insight regarding the loan's performance, the borrower's capacity to repay or the underlying collateral. In determining the Day 1 Fair Values of purchased loans without evidence of post-origination credit deterioration at the date of acquisition, management includes (i) no carry over of any previously recorded allowance for loan losses (ALL) and (ii) an adjustment of the unpaid principal balance to reflect an appropriate market rate of interest and expected loss, given the risk profile and grade assigned to each loan. This adjustment is accreted into earnings as a yield adjustment, using the effective yield method, over the remaining life of each loan. Purchased loans that contain evidence of credit deterioration on the date of purchase are individually evaluated by management to determine the estimated fair value of each loan. This evaluation includes no carryover of any previously recorded ALL. In determining the estimated fair value of purchased loans with evidence of credit deterioration, management considers a number of factors including, among other things, the remaining life of the acquired loans, estimated prepayments, estimated loss ratios, estimated value of the underlying collateral, estimated holding periods, and net present value of cash flows expected to be received. In determining the Day 1 Fair Values of purchased loans with evidence of credit deterioration, management calculates a non-accretable difference (the credit risk component of the purchased loans) and an accretable difference (the yield component of the purchased loans). The non-accretable difference is the difference between the contractually required payments and the cash flows expected to be collected in accordance with management's determination of the Day 1 Fair Values. Subsequent increases in expected cash flows will result in an adjustment to accretable yield, which will have a positive impact on interest income. Subsequent decreases in expected cash flows will generally result in increased provision for loan losses. Subsequent increases in expected cash flows following any previous decrease will result in a reversal of the provision for loan losses to the extent of prior charges and then an adjustment to accretable yield. The accretable difference on purchased loans with evidence of credit deterioration is the difference between the expected cash flows and the net present value of expected cash flows. Such difference is accreted into earnings using the effective yield method over the term of the loans. For purchased loans with evidence of credit deterioration for which the expected cash flows cannot be forecasted, these loans are deemed to be collateral dependent, are recorded at their fair value and are placed on nonaccrual, with interest payments recorded on a cash basis, as appropriate. Allowance for Loan Losses (allowance) - Pinnacle Financial's management assesses the adequacy of the allowance prior to the end of each calendar quarter. This assessment includes procedures to estimate the allowance and test the adequacy and appropriateness of the resulting balance. The level of the allowance is based upon management's evaluation of the loan portfolio, loan loss experience, asset quality trends, known and inherent risks in the portfolio, adverse situations that may affect the borrowers' ability to repay the loan (including the timing of future payment), the estimated value of any underlying collateral, composition of the loan portfolio, economic conditions, industry and peer bank loan quality indications and other pertinent factors, including regulatory recommendations. The level of allowance maintained by management is believed adequate to absorb probable losses inherent in the loan portfolio at the balance sheet date. The allowance is increased by provisions charged to expense and decreased by charge-offs, net of recoveries of amounts previously charged-off. Allocation of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management's judgment, is deemed uncollectible. Pinnacle Financial's allowance for loan loss assessment methodology was modified during the year ended December 31, 2017 to (i) extend the lookback period from 24 quarters to a period beginning January 1, 2006 to better capture the risk associated with this extended economic cycle, (ii) eliminate the use of risk ratings in the calculation of the loss rate and instead focus on loss rate by loan type and (iii) expand the economic variables used in the qualitative assessment to incorporate our expanded footprint. Pinnacle Financial also eliminated the use of a loss emergence period in light of the minimal population of losses available to evaluate that were previously being extrapolated to the full population of loans, and shifted the focus of its analysis to more of a quantitative model. There was no material impact on the adoption of the changes in the allowance for loan loss assessment methodology. Pinnacle Financial's allowance for loan losses is composed of the result of two independent analyses pursuant to the provisions of ASC 450-20, Loss Contingencies and ASC 310-10-35, Receivables . The ASC 450-20 analysis is intended to quantify the inherent risks in its performing loan portfolio. The ASC 310-10-35 analysis includes a loan-by-loan analysis of impaired loans, including those reported as nonaccrual, troubled-debt restructurings and purchase credit impaired. In assessing the adequacy of the allowance, Pinnacle Financial also considers the results of Pinnacle Financial's ongoing independent loan review process. Pinnacle Financial undertakes this process both to ascertain those loans in the portfolio with elevated credit risk and to assist in its overall evaluation of the risk characteristics of the entire loan portfolio. Its loan review process includes the judgment of management, independent internal loan reviewers, and reviews that may have been conducted by third-party reviewers including regulatory examiners. Pinnacle Financial incorporates relevant loan review results in the allowance. The ASC 450-20 component of the allowance for loan losses begins with a historical loss rate calculation for each loan pool with similar risk characteristics. The losses realized over a rolling four-quarter cycle are utilized to determine an annual loss rate for each loan pool for each quarter-end in our look-back period. The look-back period in our loss rate calculation begins with January 2006, as we believe the period from January 1, 2006 to present is more representative of this economic cycle. The loss rates for each category are then averaged and applied to the end of period loan portfolio balances to determine estimated losses. The loss rates provide a quantitative estimate of credit losses inherent in our end of period loan portfolio based on our actual loss experience. The estimated loan loss allocation for all loan segments is then adjusted for management's estimate of probable losses for a number of qualitative factors that have not been considered in the quantitative analysis. The qualitative categories and the measurements used to quantify the risks within each of these categories are subjectively selected by management, but measured by objective measurements period over period. The data for each measurement may be obtained from internal or external sources. The current period measurements are evaluated and assigned a factor commensurate with the current level of risk relative to past measurements over time. The resulting factor is applied to the non-impaired loan portfolio. This amount represents estimated probable inherent credit losses which exist, but have not yet been identified either in its risk rating or impairment process, as of the balance sheet date, and is based upon quarterly trend assessments in portfolio concentrations, policy exceptions, economic conditions, associate retention, independent loan review results, collateral considerations, credit quality, competition, enterprise wide risk assessments, and peer group credit quality. The qualitative allowance allocation, as determined by the processes noted above, is increased or decreased for each loan segment based on the assessment of these various qualitative factors. The allowance for loan losses for purchased loans is calculated similar to that utilized for legacy Pinnacle Bank loans. Pinnacle Financial's accounting policy is to compare the computed allowance for loan losses for each purchased loan to the remaining fair value adjustment at the individual loan level. If the computed allowance at the loan level is greater than the remaining fair value adjustment, the excess is added to the allowance for loan losses by a charge to the provision for loan losses. The ASC 450-20 portion of the allowance includes a small unallocated component. Pinnacle Financial believes that the unallocated amount is warranted for inherent factors that cannot be practically assigned to individual loan categories, such as the imprecision in the overall loss allocation measurement process, the subjectivity risk of potentially not considering all relevant environmental categories and related measurements and imprecision in its credit risk ratings process. The appropriateness of the unallocated component of the allowance is assessed each quarter end based upon changes in the overall business environment not otherwise captured. The impaired loan allowance is determined pursuant to ASC 310-10-35. Loans are impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement. Collection of all amounts due according to the contractual terms means collecting all interest and principal payments of a loan as scheduled in the loan agreement. This evaluation is inherently subjective as it requires material estimates including the amounts and timing of future cash flows expected to be received on impaired loans that may be susceptible to significant change. Loan losses are charged off when management believes that the full collectability of the loan is unlikely. A loan may be partially charged-off after a "confirming event" has occurred which serves to validate that full repayment pursuant to the terms of the loan is unlikely. An impairment allowance is recognized if the fair value of the loan is less than the recorded investment in the loan (recorded investment in the loan is the principal balance plus any accrued interest, net of deferred loan fees or costs and unamortized premium or discount). The impairment is recognized through the provision for loan losses and is a component of the allowance for loan losses. Loans that are impaired are recorded at the present value of expected future cash flows discounted at the loan's effective interest rate, or if the loan is collateral dependent, at the fair value of the collateral, less estimated disposal costs. If the loan is cash flow dependent, a specific reserve is established as a component of the allowance. If the loan is collateral dependent, the principal balance of the loan is charged-off in an amount equal to the impairment measurement. The fair value of collateral dependent loans is derived primarily from collateral appraisals performed by independent third-party appraisers. Management believes it follows appropriate accounting and regulatory guidance in determining impairment and accrual status of impaired loans. This analysis is completed for all individual loans greater than $500,000 . The resulting allowance percentage by segment adjusted for specific trends identified, if applicable, is then applied to the remaining population of impaired loans. Pursuant to the guidance set forth in ASU No. 2011-02, A Creditor's Determination of Whether a Restructuring is a Troubled Debt Restructuring , the above impairment methodology is also applied to those loans identified as troubled debt restructurings. Sufficiency of the computed allowance is then tested by comparison to historical trends and industry and peer information. Pinnacle Financial then evaluates the result of the procedures performed, including the results of its testing, and concludes on the appropriateness of the balance of the allowance in its entirety. The audit committee of Pinnacle Financial's board of directors reviews and approves the methodology and resultant allowance prior to the filing of quarterly and annual financial information. While its policies and procedures used to estimate the allowance for loan losses, as well as the resultant provision for loan losses charged to income, are considered adequate by management and are reviewed from time to time by regulators, they are necessarily approximate and imprecise. There are factors beyond Pinnacle Financial's control, such as conditions in the local, national, and international economy, a local real estate market or particular industry conditions which may materially negatively impact asset quality and the adequacy of the allowance for loan losses and thus the resulting provision for loan losses. Transfers of Financial Assets — Transfers of financial assets are accounted for as sales when control over the assets has been surrendered or in the case of a loan participation, a portion of the asset has been surrendered and meets the definition of a "participating interest". Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from Pinnacle Financial, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) Pinnacle Financial does not maintain effective control over the transferred assets through an agreement to repurchase them before maturity. Premises and Equipment and Leaseholds — Premises and equipment are carried at cost less accumulated depreciation and amortization computed principally by the straight-line method over the estimated useful lives of the assets or the expected lease terms for leasehold improvements, whichever is shorter. Useful lives for all premises and equipment range between three and thirty years. Pinnacle Bank is the lessee with respect to several office locations. All such leases are being accounted for as operating leases within the accompanying consolidated financial statements, with the exception of the one capital lease agreement discussed below. Several of these leases include rent escalation clauses. Pinnacle Bank expenses the costs associated with these escalating payments over the life of the expected lease term using the straight-line method. At December 31, 2017 , the deferred liability associated with these escalating rentals was approximately $3.5 million and is included in other liabilities in the accompanying consolidated balance sheets. Pinnacle Bank has one lease being accounted for as a capital lease within the accompanying consolidated financial statements. Amortization of property under the capital lease is expensed over the life of the expected lease term using the straight-line method and is included in depreciation expense. Other Real Estate Owned — Other real estate owned (OREO) represents real estate foreclosed upon or acquired by deed in lieu of foreclosure by Pinnacle Bank through loan defaults by customers. Substantially all of these amounts relate to lots, homes and residential development projects that are either completed or are in various stages of construction for which Pinnacle Financial believes it has adequately supported the value recorded. Upon its acquisition by Pinnacle Bank, the property is recorded at fair value, based on appraised value, less

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	Note 2. Acquisitions BNC Bancorp. On June 16, 2017, Pinnacle Financial consummated its merger with BNC. Pursuant to the terms of the Agreement and Plan of Merger, dated as of January 22, 2017, by and between Pinnacle Financial and BNC, BNC merged with and into Pinnacle Financial, with Pinnacle Financial continuing as the surviving corporation (the BNC Merger). On that same day, Pinnacle Bank and Bank of North Carolina, BNC's wholly-owned bank subsidiary, merged, with Pinnacle Bank continuing as the surviving entity. The following summarizes the consideration paid and presents a preliminary allocation of purchase price to net assets acquired (dollars in thousands): Number of Shares Amount Equity consideration Common stock issued 27,687,100 $ 1,858,133 Total equity consideration $ 1,858,133 Non-Equity Consideration: Cash paid to redeem common stock 129 Total consideration paid $ 1,858,262 Allocation of total consideration paid: Fair value of net assets assumed including estimated identifiable intangible assets $ 601,807 Goodwill 1,256,455 $ 1,858,262 Pinnacle Financial recorded costs incurred in connection with the issuance of Pinnacle Financial common stock resulting from the BNC Merger of $7.2 million , net of related tax benefits, as a reduction to additional paid in capital. Certain merger-related charges resulting from cultural and systems integrations, as well as stock-based compensation expense incurred as a result of change-in-control provisions applicable to assumed equity-based awards were recorded as merger-related expense. Goodwill originating from the BNC Merger resulted primarily from anticipated synergies arising from the combination of certain operational areas of the businesses of BNC and Pinnacle Financial as well as the purchase premium inherent in buying a complete and successful banking operation. Goodwill associated with the BNC Merger is not amortizable for book or tax purposes. Adjustments totaling $82.9 million were recorded to goodwill to appropriately reflect the valuation of the loan portfolio, OREO acquired, and certain assets acquired and liabilities assumed and have been included in the table below. Pinnacle Financial accounted for the BNC Merger under the acquisition method in accordance with ASC Topic 805. Accordingly, the purchase price is allocated to the fair value of the assets acquired and liabilities assumed as of the date of merger. The following purchase price allocations on the BNC Merger are preliminary and will be finalized upon the receipt of final valuations on certain assets and liabilities. Upon receipt of final fair value estimates, which must be received within one year of the BNC Merger date, Pinnacle Financial will make any final adjustments to the purchase price allocation and prospectively adjust any goodwill recorded. Information regarding Pinnacle Financial's loan discount and related deferred tax asset, core deposit intangible asset and related deferred tax liability, as well as income taxes payable and the related deferred tax balances recorded in the BNC Merger, may be adjusted as Pinnacle Financial refines its estimates. Determining the fair value of assets and liabilities, particularly illiquid assets and liabilities, is a complicated process involving significant judgment regarding estimates and assumptions used to calculate estimated fair value. Fair value adjustments based on updated estimates could materially affect the goodwill recorded on the BNC Merger. Pinnacle Financial may incur losses on the acquired loans that are materially different from losses Pinnacle Financial originally projected. The acquired assets and liabilities, as well as the adjustments to record the assets and liabilities at their estimated fair values, are presented in the following tables (in thousands): As of June 16, 2017 BNC Historical Cost Basis Fair Value Adjustments (1) As Recorded by Pinnacle Financial Assets Cash and cash equivalents $ 155,271 $ — $ 155,271 Investment securities 643,875 1,667 645,542 Loans, net of allowance for loan losses (2) 5,782,720 (181,430 ) 5,601,290 Mortgage loans held for sale 27,026 — 27,026 Other real estate owned (3) 20,143 600 20,743 Core deposit and other intangible (4) — 50,422 50,422 Property, plant and equipment (5) 156,805 (3,381 ) 153,424 Other assets (6) 320,988 53,997 374,985 Total Assets $ 7,106,828 $ (78,125 ) $ 7,028,703 Liabilities Interest-bearing deposits (7) $ 5,003,653 $ 4,355 $ 5,008,008 Non-interest bearing deposits 1,199,342 — 1,199,342 Borrowings (8) 183,389 (6,412 ) 176,977 Other liabilities (9) 35,729 6,840 42,569 Total Liabilities $ 6,422,113 $ 4,783 $ 6,426,896 Net Assets Acquired $ 684,715 $ (82,908 ) $ 601,807 Explanation of certain fair value adjustments: (1) The amount represents the adjustment of the book value of BNC's assets and liabilities to their estimated fair value on the date of acquisition. Fair value adjustments are updated subsequent to the merger date based on the results of finalized valuation assessments. (2) The amount represents the adjustment of the net book value of BNC's loans to their estimated fair value based on interest rates and expected cash flows as of the date of acquisition, which includes estimates of expected credit losses inherent in the portfolio of approximately 2.6% of the 3.1% mark on the acquired loan portfolio. (3) Although not complete, this adjustment reflects the Day 1 value of OREO properties subsequently sold. (4) The amount represents the fair value of the core deposit intangible asset representing the intangible value of the deposit base acquired and the fair value of the customer relationship intangible assets representing the intangible value of customer relationships acquired. (5) The amount represents the adjustment of the net book value of BNC's property, plant and equipment to estimated fair value based on market values of similar assets. (6) The amount represents the deferred tax asset recognized on the fair value adjustment of BNC's acquired assets and assumed liabilities. (7) The amount represents the adjustment necessary because the weighted average interest rate of BNC's deposits exceeded the cost of similar funding at the time of acquisition. The fair value adjustment will be amortized to reduce future interest expense over the life of the portfolio. (8) The amount represents the combined adjustment necessary because the weighted average interest rate of BNC's subordinated debt issuance exceeded the cost of similar funding at the time of acquisition and because the weighted average interest rate of BNC's trust preferred securities issuances was lower than the cost of similar funding at the time of acquisition. The combined fair value adjustments will be amortized to increase future interest expense over the lives of the portfolios. (9) The amount represents the adjustment to accrue obligations that existed but had not been recorded as of the acquisition date and the fair value of BNC lease obligations. Supplemental Pro Forma Combined Results of Operations The supplemental proforma information below for the years ended December 31, 2017 and 2016 gives effect to the BNC acquisition as if it had occurred on January 1, 2016. These results combine the historical results of BNC into Pinnacle Financial's consolidated statement of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments, they are not indicative of what would have occurred had the BNC Merger taken place on the indicated date nor are they intended to represent or be indicative of future results of operations. In particular, no adjustments have been made to eliminate the amount of BNC's provision for credit losses for 2016 that may not have been necessary had the acquired loans been recorded at fair value as of the beginning of 2016. Additionally, these financials were not adjusted for non-recurring expenses, such as merger-related charges incurred by either Pinnacle Financial or BNC. Pinnacle Financial expects to achieve operating cost savings and other business synergies as a result of the acquisition which are also not reflected in the proforma amounts. (dollars in thousands) Year ended December 31, 2017 2016 Revenue (1) $ 844,896 $ 707,126 Income before income taxes 347,983 275,635 (1) Net interest income plus noninterest income

Equity method investment

Equity method investment	12 Months Ended
	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investment	Note 3. Equity Method Investment On February 1, 2015, Pinnacle Bank acquired a 30% interest in Bankers Healthcare Group, LLC (BHG) for $75 million in cash. On March 1, 2016, Pinnacle Bank and Pinnacle Financial increased their investment in BHG by a combined 19% , for a total investment in BHG of 49% . The additional 19% interest was acquired pursuant to a purchase agreement whereby both Pinnacle Financial and Pinnacle Bank acquired 8.55% and an additional 10.45% , respectively, of the outstanding membership interests in BHG in exchange for $74.1 million in cash and 860,470 shares of Pinnacle Financial common stock valued at $39.9 million. On March 1, 2016, Pinnacle Financial, Pinnacle Bank and the other members of BHG entered into an Amended and Restated Limited Liability Company Agreement of BHG that provides for, among other things, the following terms: • the inability of any member of BHG to transfer its ownership interest in BHG without the consent of the other members of BHG for five years, other than transfers to family members, trusts or affiliates of the transferring member, in connection with the acquisition of Pinnacle Financial or Pinnacle Bank or as a result of a change in applicable law that forces Pinnacle Financial and/or Pinnacle Bank to divest their ownership interests in BHG; • the inability of the board of managers of BHG (of which Pinnacle Financial and Pinnacle Bank have the right to designate two of the five members (the Pinnacle Managers) to approve a sale of BHG without the consent of one of the Pinnacle Managers for four years; • co-sale rights for Pinnacle Financial and Pinnacle Bank in the event the other members of BHG decide to sell all or a portion of their ownership interests after the above-described five -year limitation; and • a right of first refusal for BHG and the other members of BHG in the event that Pinnacle Financial and/or Pinnacle Bank decide to sell all or a portion of their ownership interests after the above-described five -year limitation, except in connection with a transfer of their ownership interests to an affiliate or in connection with the acquisition of Pinnacle Financial or Pinnacle Bank. Pinnacle Financial accounts for this investment pursuant to the equity method for unconsolidated subsidiaries and will recognize its interest in BHG's profits and losses in noninterest income with corresponding adjustments to the BHG investment account. Because BHG has been determined to be a voting interest entity of which Pinnacle Financial and Pinnacle Bank together control less than a majority of the board seats following the closing of the additional investment in March 2016, this investment does not require consolidation and is accounted for pursuant to the equity method of accounting. Additionally, Pinnacle Financial did not recognize any goodwill or other intangible asset associated with these transactions as of the respective purchase dates, however, it will recognize accretion income and amortization expense associated with the fair value adjustments to the net assets acquired including the fair value of certain of BHG's liabilities which are recorded as a component of income from equity method investment, pursuant to the equity method of accounting. Pinnacle Financial and Pinnacle Bank account for their consolidated interest in BHG's profits and losses in noninterest income with corresponding adjustments to the BHG investment account. At December 31, 2017 , Pinnacle Financial has recorded technology, trade name and customer relationship intangibles, net of related amortization, of $13.4 million compared to $16.8 million as of December 31, 2016 . Amortization expense of $3.3 million was included in Pinnacle Financial's results for the year ended December 31, 2017 compared to $3.4 million for 2016. Accretion income of $3.1 million was included in Pinnacle Financial's results for the year ended December 31, 2017 , while $2.5 million accretion income was recorded in 2016 . Additionally, at December 31, 2017 , Pinnacle Financial had recorded accretable discounts associated with certain liabilities of BHG of $10.3 million compared to $13.4 million as of December 31, 2016 . During the year ended December 31, 2017 , Pinnacle Financial and Pinnacle Bank received dividends from BHG of $21.7 million in the aggregate, respectively, compared to $29.0 million in the year ended December 31, 2016 . Earnings from BHG are included in Pinnacle Financial's consolidated tax return. Profits from intercompany transactions are eliminated. A summary of BHG's financial position and results of operations as of and for the years ended December 31, 2017 and 2016 , respectively, were as follows (unaudited, in thousands): Banker's Healthcare Group ($ in thousands) December 31, 2017 December 31, 2016 Assets $ 330,030 $ 223,246 Liabilities $ 224,837 $ 139,531 Equity interests 105,193 83,715 Total liabilities and equity $ 330,030 $ 223,246 For the year ended December 31, 2017 2016 Revenues $ 160,209 $ 136,693 Net income, pre-tax $ 77,941 $ 67,135

Restricted Cash Balances

Restricted Cash Balances	12 Months Ended
	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Restricted Cash Balances	Note 4. Restricted Cash Balances Regulation D of the Federal Reserve Act requires that banks maintain reserve balances with the Federal Reserve Bank based principally on the type and amount of their deposits. At our option, Pinnacle Financial maintains additional balances to compensate for clearing and other services. For the years ended December 31, 2017 and 2016 , the average daily balance maintained at the Federal Reserve was approximately $229.9 million and $183.1 million , respectively.

Securities

Securities	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities	Note 5. Securities The amortized cost and fair value of securities available-for-sale and held-to-maturity at December 31, 2017 and 2016 are summarized as follows (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2017 Securities available-for-sale: U.S Treasury securities $ 30,505 $ — $ 60 $ 30,445 U.S. Government agency securities 182,500 67 1,766 180,801 Mortgage-backed securities 1,270,625 5,318 12,124 1,263,819 State and municipal securities 774,949 12,251 2,588 784,612 Asset-backed securities 173,346 262 316 173,292 Corporate notes 81,615 1,346 647 82,314 $ 2,513,540 $ 19,244 $ 17,501 $ 2,515,283 Securities held-to-maturity: State and municipal securities 20,762 114 46 20,830 $ 20,762 $ 114 $ 46 $ 20,830 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2016 Securities available-for-sale: U.S Treasury securities $ 250 $ — $ — $ 250 U.S. Government agency securities 22,306 — 537 21,769 Mortgage-backed securities 988,008 4,304 15,686 976,626 State and municipal securities 211,581 4,103 2,964 212,720 Asset-backed securities 79,318 111 849 78,580 Corporate notes 8,608 39 46 8,601 $ 1,310,071 $ 8,557 $ 20,082 $ 1,298,546 Securities held-to-maturity: State and municipal securities 25,251 87 105 25,233 $ 25,251 $ 87 $ 105 $ 25,233 At December 31, 2017 , approximately $1.1 billion of Pinnacle Financial's investment portfolio was pledged to secure public funds and other deposits and securities sold under agreements to repurchase. At December 31, 2017 , repurchase agreements comprised of secured borrowings totaled $135.3 million and were secured by $135.3 million of pledged U.S. government agency securities, municipal securities, asset backed securities, and corporate debentures. As the fair value of securities pledged to secure repurchase agreements may decline, Pinnacle Financial regularly evaluates its need to pledge additional securities for the counterparty to remain adequately secured. The amortized cost and fair value of debt securities as of December 31, 2017 by contractual maturity are shown below. Actual maturities may differ from contractual maturities of mortgage-backed securities since the mortgages underlying the securities may be called or prepaid with or without penalty. Therefore, these securities are not included in the maturity categories in the following summary (in thousands): Available-for-sale Held-to-maturity Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 33,251 $ 33,196 $ 1,329 $ 1,330 Due in one year to five years 65,214 65,775 6,210 6,200 Due in five years to ten years 185,337 187,198 10,425 10,469 Due after ten years 785,767 792,003 2,798 2,831 Mortgage-backed securities 1,270,625 1,263,819 — — Asset-backed securities 173,346 173,292 — — $ 2,513,540 $ 2,515,283 $ 20,762 $ 20,830 At December 31, 2017 and 2016 , included in securities were the following investments with unrealized losses. The information below classifies these investments according to the term of the unrealized loss of less than twelve months or twelve months or longer (in thousands): Investments with an Unrealized Loss of less than 12 months Investments with an Unrealized Loss of 12 months or longer Total Investments with an Unrealized Loss Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses December 31, 2017 U.S. Treasury securities $ 29,948 $ 60 $ — $ — $ 29,948 $ 60 U.S. government agency securities 173,677 1,766 — — 173,677 1,766 Mortgage-backed securities 607,408 5,042 285,561 7,082 892,969 12,124 State and municipal securities 115,403 1,408 50,083 1,226 165,486 2,634 Asset-backed securities 68,742 198 14,136 118 82,878 316 Corporate notes 22,168 547 11,944 100 34,112 647 Investments with an Unrealized Loss of less than 12 months Investments with an Unrealized Loss of 12 months or longer Total Investments with an Unrealized Loss Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Total temporarily-impaired securities $ 1,017,346 $ 9,021 $ 361,724 $ 8,526 $ 1,379,070 $ 17,547 December 31, 2016 U.S. Treasury securities $ — $ — $ — $ — $ — $ — U.S. government agency securities — — 20,820 537 20,820 537 Mortgage-backed securities 801,213 15,073 43,148 613 844,361 15,686 State and municipal securities 87,277 3,068 312 1 87,589 3,069 Asset-backed securities 14,510 32 34,097 817 48,607 849 Corporate notes 4,810 46 — — 4,810 46 Total temporarily-impaired securities $ 907,810 $ 18,219 $ 98,377 $ 1,968 $ 1,006,187 $ 20,187 The applicable date for determining when securities are in an unrealized loss position is December 31, 2017 and 2016 . As such, it is possible that a security had a market value less than its amortized cost on other days during the twelve-month periods ended December 31, 2017 and 2016 , but is not in the "Investments with an Unrealized Loss of less than 12 months" category above. As shown in the table above, at December 31, 2017 and 2016 , Pinnacle Financial had unrealized losses of $17.5 million and $20.2 million on $1.4 billion and $1.0 billion , respectively, of available-for-sale and held-to-maturity securities. The unrealized losses associated with these investment securities are primarily driven by changes in interest rates and typically are not due to the credit quality of the securities. These securities will continue to be monitored as a part of our ongoing impairment analysis, but are expected to perform even if the rating agencies reduce the credit rating of the bond issuers. Management evaluates the financial performance of the issuers on a quarterly basis to determine if it is probable that the issuers can make all contractual principal and interest payments. Because Pinnacle Financial currently does not intend to sell these securities and it is not more-likely-than-not that Pinnacle Financial will be required to sell the securities before recovery of their amortized cost bases, which may be maturity, Pinnacle Financial does not consider these securities to be other-than-temporarily impaired at December 31, 2017 . Periodically, available-for-sale securities may be sold or the composition of the portfolio realigned to improve yields, quality or marketability, or to implement changes in investment or asset/liability strategy, including maintaining collateral requirements and raising funds for liquidity purposes. Additionally, if an available-for-sale security loses its investment grade or tax-exempt status, the underlying credit support is terminated or collection otherwise becomes uncertain based on factors known to management, Pinnacle Financial will consider selling the security, but will review each security on a case-by-case basis as these factors become known. Consistent with the investment policy, in 2017 available-for-sale securities of approximately $300.0 million were sold and net unrealized losses of $8.3 million were reclassified from accumulated other comprehensive income into net income. The carrying values of Pinnacle Financial's investment securities could decline in the future if the financial condition of the securities' issuers deteriorates and management determines it is probable that Pinnacle Financial will not recover the entire amortized cost bases of the securities. As a result, there is a risk that other-than-temporary impairment charges may occur in the future. Additionally, there is a risk that other-than-temporary impairment charges may occur in the future if management's intention to hold these securities to maturity and or recovery changes.

Loans and Allowance for Loan Lo

Loans and Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans and Allowance for Loan Losses	Note 6. Loans and Allowance for Loan Losses For financial reporting purposes, Pinnacle Financial classifies its loan portfolio based on the underlying collateral utilized to secure each loan. This classification is consistent with those utilized in the Quarterly Report of Condition and Income filed with the Federal Deposit Insurance Corporation (FDIC). Pinnacle Financial uses five loan categories: commercial real estate mortgage, consumer real estate mortgage, construction and land development, commercial and industrial, consumer and other. • Commercial real-estate mortgage loans . Commercial real-estate mortgage loans are categorized as such based on investor exposures where repayment is largely dependent upon the operation, refinance, or sale of the underlying real estate. Commercial real-estate mortgage also includes owner occupied commercial real estate which shares a similar risk profile to our commercial and industrial products. • Consumer real-estate mortgage loans . Consumer real-estate mortgage consists primarily of loans secured by 1-4 residential properties including home equity lines of credit. • Construction and land development loans . Construction and land development loans include loans where the repayment is dependent on the successful operation of the related real estate project. Construction and land development loans include 1-4 family construction projects and commercial construction endeavors such as warehouses, apartments, office and retail space and land acquisition and development. • Commercial and industrial loans . Commercial and industrial loans include loans to business enterprises issued for commercial, industrial and/or other professional purposes. • Consumer and other loans . Consumer and other loans include all loans issued to individuals not included in the consumer real-estate mortgage classification. Examples of consumer and other loans are automobile loans, credit cards and loans to finance education, among others. Commercial loans receive risk ratings by the assigned financial advisor subject to validation by Pinnacle Financial's independent loan review department. Risk ratings are categorized as pass, special mention, substandard, substandard-nonaccrual or doubtful-nonaccrual. Pass-rated loans include five distinct ratings categories for loans that represent specific attributes. Pinnacle Financial believes that its categories follow those outlined by Pinnacle Bank's primary regulators. At December 31, 2017 , approximately 81.4% of our loan portfolio was analyzed as a commercial loan type with a specifically assigned risk rating in the allowance for loan loss assessment. Consumer loans and small business loans are generally not assigned an individual risk rating but are evaluated as either accrual or nonaccrual based on the performance of the individual loans. However, certain consumer real estate-mortgage loans and certain consumer and other loans receive a specific risk rating due to the loan proceeds being used for commercial purposes even though the collateral may be of a consumer loan nature. Risk ratings are subject to continual review by a financial advisor and a senior credit officer. At least annually, our credit policy requires that every risk rated loan of $1.0 million or more be subject to a formal credit risk review process. Each loan's risk rating is also subject to review by our independent loan review department, which reviews a substantial portion of our risk rated portfolio annually. Included in the coverage are independent loan reviews of loans in targeted higher-risk portfolio segments such as certain commercial and industrial loans, land loans and/or loan types in certain geographies. The following table presents our loan balances by primary loan classification and the amount within each risk rating category. Pass-rated loans include all credits other than those included in special mention, substandard, substandard-nonaccrual and doubtful-nonaccrual which are defined as follows: • Special mention loans have potential weaknesses that deserve management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in Pinnacle Financial's credit position at some future date. • Substandard loans are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Assets so classified must have a well-defined weakness or weaknesses that jeopardize collection of the debt. Substandard loans are characterized by the distinct possibility that Pinnacle Financial will sustain some loss if the deficiencies are not corrected. • Substandard-nonaccrual loans are substandard loans that have been placed on nonaccrual status. • Doubtful-nonaccrual loans have all the characteristics of substandard-nonaccrual loans with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The following table outlines the amount of each loan classification categorized into each risk rating category as of December 31, 2017 and 2016 (in thousands): December 31, 2017 Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer and other Total Pass $ 6,487,368 $ 2,503,688 $ 1,880,704 $ 4,014,656 $ 351,359 $ 15,237,775 Special Mention 94,134 18,356 8,148 46,898 1,177 168,713 Substandard (1) 72,044 21,053 13,468 62,529 79 169,173 Substandard-nonaccrual 16,064 18,117 5,968 17,258 48 57,455 Doubtful-nonaccrual — — — — — — Total loans $ 6,669,610 $ 2,561,214 $ 1,908,288 $ 4,141,341 $ 352,663 $ 15,633,116 December 31, 2016 Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer Total Pass $ 3,137,452 $ 1,160,361 $ 897,556 $ 2,782,713 $ 264,723 $ 8,242,805 Special Mention 21,449 1,856 2,716 25,641 802 52,464 Substandard (1) 29,674 15,627 5,788 75,861 129 127,079 Substandard-nonaccrual 4,921 8,073 6,613 7,492 475 27,574 Doubtful-nonaccrual — — — 3 — 3 Total loans $ 3,193,496 $ 1,185,917 $ 912,673 $ 2,891,710 $ 266,129 $ 8,449,925 (1) Potential problem loans represent those loans with a well-defined weakness and where information about possible credit problems of borrowers has caused management to have doubts about the borrower's ability to comply with present repayment terms. This definition is believed to be substantially consistent with the standards established by Pinnacle Bank's primary regulators for loans classified as substandard, excluding the impact of substandard nonperforming loans and substandard troubled debt restructurings. Potential problem loans, which are not included in nonperforming assets, amounted to approximately $164.0 million at December 31, 2017 , compared to $114.6 million at December 31, 2016 . At December 31, 2017 and 2016 , all loans classified as nonaccrual were deemed to be impaired. The principal balances of these nonaccrual loans amounted to $57.5 million and $27.6 million at December 31, 2017 and 2016 , respectively, and are included in the table above. For the twelve months ended December 31, 2017 , the average balance of nonaccrual loans was $66.0 million as compared to $35.1 million for the twelve months ended December 31, 2016. Pinnacle Financial's policy is that the discontinuation of the accrual of interest income will occur when (1) there is a significant deterioration in the financial condition of the borrower and full repayment of principal and interest is not expected or (2) the principal or interest is more than 90 days past due, unless the loan is both well secured and in the process of collection. As such, at the date the above mentioned loans were placed on nonaccrual status, Pinnacle Financial reversed all previously accrued interest income against current year earnings. Had these nonaccruing loans been on accruing status, interest income would have been higher by $2.7 million , $2.1 million and $2.3 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. The following table provides a rollforward of purchase credit impaired loans from December 31, 2016 through December 31, 2017 (in thousands): Gross Carrying Value Accretable Yield Nonaccretable Yield Carrying Value December 31, 2015 $ 16,274 $ — $ (4,143 ) $ 12,131 Acquisitions 1,359 — (812 ) 547 Settlements, net (5,165 ) — 1,322 (3,843 ) December 31, 2016 12,468 — (3,633 ) 8,835 Acquisitions 80,812 (196 ) (32,314 ) 48,302 Settlements, net (18,956 ) 64 4,410 (14,482 ) December 31, 2017 $ 74,324 $ (132 ) $ (31,537 ) $ 42,655 These loans were deemed to be collateral dependent at the time of acquisition. Settlements include both loans that were charged-off as well as loans that were paid off, typically as a result of refinancings at other institutions. Purchase credit impaired loans purchased during the year ended December 31, 2017 for which it was probable at acquisition that all contractually required payments would not be collected are as follows (in thousands): December 31, 2017 2016 2015 Contractually required payments receivable $ 94,312 $ 1,359 $ 19,960 Cash flows expected to be collected at acquisition 48,498 547 14,257 Fair value of acquired loans at acquisition 48,302 547 14,257 The following tables detail the recorded investment, unpaid principal balance and related allowance and average recorded investment of our nonaccrual loans at December 31, 2017 , 2016 and 2015 by loan classification and the amount of interest income recognized on a cash basis throughout the year-to-date period then ended, respectively, on these loans that remain on the balance sheets (in thousands): December 31, 2017 For the year ended Recorded investment Unpaid principal balance Related allowance Average recorded investment Cash basis interest income recognized Collateral dependent nonaccrual loans: Commercial real estate – mortgage $ 13,570 $ 16,631 $ 38 $ 13,839 $ — Consumer real estate – mortgage 10,093 14,309 115 11,216 — Construction and land development 5,735 10,273 6 5,935 95 Commercial and industrial 2,135 3,533 362 2,980 — Consumer and other — — — — — Total $ 31,533 $ 44,746 $ 521 $ 33,970 $ 95 Cash flow dependent nonaccrual loans: Commercial real estate – mortgage $ 2,494 $ 2,505 $ 95 $ 3,463 $ — Consumer real estate – mortgage 8,024 8,079 411 10,076 — Construction and land development 233 233 12 438 — Commercial and industrial 15,171 15,224 1,278 18,027 — Consumer and other — — — — — Total $ 25,922 $ 26,041 $ 1,796 $ 32,004 $ — Total Nonaccrual Loans $ 57,455 $ 70,787 $ 2,317 $ 65,974 $ 95 December 31, 2016 For the year ended Recorded investment Unpaid principal balance Related allowance Average recorded investment Cash basis interest income recognized Collateral dependent nonaccrual loans: Commercial real estate – mortgage $ 2,308 $ 2,312 $ — $ 2,540 $ — Consumer real estate – mortgage 2,880 2,915 — 2,907 — Construction and land development 3,128 3,135 — 3,132 159 Commercial and industrial 6,373 6,407 — 8,841 — Consumer and other — — — — — Total $ 14,689 $ 14,769 $ — $ 17,420 $ 159 Cash flow dependent nonaccrual loans: Commercial real estate – mortgage $ 2,613 $ 3,349 $ 59 $ 2,688 $ — Consumer real estate – mortgage 5,193 5,775 688 5,966 — Construction and land development 3,485 4,154 20 3,476 — Commercial and industrial 1,122 2,714 77 2,884 — Consumer and other 475 851 227 2,624 — Total $ 12,888 $ 16,843 $ 1,071 $ 17,638 $ — Total Nonaccrual Loans $ 27,577 $ 31,612 $ 1,071 $ 35,058 $ 159 December 31, 2015 For the year ended Recorded investment Unpaid principal balance Related allowance Average recorded investment Cash basis interest income recognized Collateral dependent nonaccrual loans: Commercial real estate – mortgage $ 4,411 $ 5,659 $ — $ 2,253 $ — Consumer real estate – mortgage 5,596 6,242 — 3,067 — Construction and land development 7,531 7,883 — 4,317 308 Commercial and industrial 1,420 3,151 — 1,527 — Consumer and other — — — — — Total $ 18,958 $ 22,935 $ — $ 11,164 $ 308 Cash flow dependent nonaccrual loans: Commercial real estate – mortgage $ 1,410 $ 1,661 $ 20 $ 1,466 $ — Consumer real estate – mortgage 3,750 4,098 616 3,815 — Construction and land development 76 125 12 87 — Commercial and industrial 263 281 19 168 — Consumer and other 4,902 5,341 3,002 4,913 — Total $ 10,401 $ 11,506 $ 3,669 $ 10,449 $ — Total Nonaccrual Loans $ 29,359 $ 34,441 $ 3,669 $ 21,613 $ 308 Pinnacle Financial's policy is that once a loan is placed on nonaccrual status each subsequent payment is reviewed on a case-by-case basis to determine if the payment should be applied to interest or principal pursuant to regulatory guidelines. Pinnacle Financial recognized approximately $95,000 , $159,000 and $308,000 in interest income from cash payments received on nonaccrual loans during the years ended December 31, 2017 , 2016 , and 2015 , respectively. At December 31, 2017 and 2016 , there were $6.6 million and $15.0 million , respectively, of troubled debt restructurings that were performing as of their restructure date and which are accruing interest. These troubled debt restructurings are considered impaired loans pursuant to U.S. GAAP. Troubled commercial loans are restructured by specialists within Pinnacle Bank's Special Assets Group, and all restructurings are approved by committees and credit officers separate and apart from the normal loan approval process. These specialists are charged with reducing Pinnacle Financial's overall risk and exposure to loss in the event of a restructuring by obtaining some or all of the following: improved documentation, additional guaranties, increase in curtailments, reduction in collateral release terms, additional collateral or other similar strategies. The following table outlines the amount of each troubled debt restructuring by loan classification made during the years ended December 31, 2017 , 2016 and 2015 (dollars in thousands): Number of contracts Pre Modification Outstanding Recorded Investment Post Modification Outstanding Recorded Investment, net of related allowance December 31, 2017 Commercial real estate – mortgage — $ — $ — Consumer real estate – mortgage 1 6 5 Construction and land development — — — Commercial and industrial 2 3,776 3,751 Consumer and other — — — 3 $ 3,782 $ 3,756 December 31, 2016 Commercial real estate – mortgage — $ — $ — Consumer real estate – mortgage — — — Construction and land development — — — Commercial and industrial 6 11,084 11,083 Consumer and other — — — 6 $ 11,084 $ 11,083 Number of contracts Pre Modification Outstanding Recorded Investment Post Modification Outstanding Recorded Investment, net of related allowance December 31, 2015 Commercial real estate – mortgage 1 $ 223 $ 185 Consumer real estate – mortgage — — — Construction and land development — — — Commercial and industrial 1 434 337 Consumer and other — — — 2 $ 657 $ 522 During the years ended December 31, 2017 , 2016 and 2015 , Pinnacle Financial had no troubled debt restructurings that subsequently defaulted within twelve months of the restructuring. A default is defined as an occurrence which violates the terms of the receivable's contract. At December 31, 2017 and 2016, the allowance for loan losses included no allowance and $21,000, respectively, specifically related to accruing troubled debt restructurings, which are classified as impaired loans pursuant to U.S. GAAP; however, these loans continue to accrue interest at contractual rates. In addition to the loan metrics above, Pinnacle Financial analyzes its commercial loan portfolio to determine if a concentration of credit risk exists to any industries. Pinnacle Financial utilizes broadly accepted industry classification systems in order to classify borrowers into various industry classifications. Pinnacle Financial has a credit exposure (loans outstanding plus unfunded lines of credit) exceeding 25% of Pinnacle Bank's total risk-based capital to borrowers in the following industries at December 31, 2017 with the comparative exposures for December 31, 2016 (in thousands): At December 31, 2017 Outstanding Principal Balances Unfunded Commitments Total exposure Total Exposure at Lessors of nonresidential buildings $ 2,778,454 $ 32,497 $ 2,810,951 $ 1,701,853 Lessors of residential buildings 870,777 13,467 884,244 874,234 Hotels and motels 627,126 1,865 628,991 291,865 Additionally, Pinnacle Financial monitors two ratios regarding construction and commercial real estate lending as part of its concentration management processes. Both ratios are calculated by dividing certain types of loan balances for each of the two categories by Pinnacle Bank’s total risk-based capital. At December 31, 2017 and 2016, Pinnacle Bank’s construction and land development loans as a percentage of total risk-based capital was 89.4% and 80.3%, respectively. Non-owner occupied commercial real estate and multifamily loans (including construction and loan development loans) was 297.1% and 256.0% for December 31, 2017 and 2016, respectively. Banking regulations have established guidelines for the construction ratio of less than 100% of total risk-based capital and for the non-owner occupied ratio of less than 300% of total risk-based capital. Should a bank’s ratios be in excess of these guidelines, banking regulations generally require an increased level of monitoring in these lending areas by bank management. At both December 31, 2017 and 2016, Pinnacle Bank’s computed ratios were below the applicable regulatory guidelines. Pinnacle Bank believes that it has the appropriate monitoring controls in place should it exceed the regulatory guidelines in a future period. The table below presents past due balances at December 31, 2017 and 2016 , by loan classification and segment allocated between performing and nonperforming status (in thousands): 30-89 days past due and performing 90 days or more past due and performing Total past due and performing Current Purchase credit impaired Nonaccrual (1) Nonaccruing purchase credit impaired Total Loans December 31, 2017 Commercial real estate: Owner-occupied $ 6,772 $ 104 $ 6,876 $ 2,435,819 $ 4,820 $ 11,395 $ 1,105 $ 2,460,015 All other 16,559 — 16,559 4,177,454 12,018 704 2,860 4,209,595 Consumer real estate – mortgage 14,835 1,265 16,100 2,521,748 5,249 9,320 8,797 2,561,214 Construction and land development 4,136 146 4,282 1,894,560 3,478 2,878 3,090 1,908,288 Commercial and industrial 7,406 1,348 8,754 4,114,127 1,154 17,222 84 4,141,341 Consumer and other 6,311 1,276 7,587 345,076 — — — 352,663 $ 56,019 $ 4,139 $ 60,158 $ 15,488,784 $ 26,719 $ 41,519 $ 15,936 $ 15,633,116 December 31, 2016 Commercial real estate: Owner-occupied $ 3,505 $ — $ 3,505 $ 1,347,134 $ — $ 2,297 $ 1,957 $ 1,354,893 All other — — — 1,837,936 — 239 428 1,838,603 Consumer real estate – mortgage 3,838 53 3,891 1,173,953 — 5,553 2,520 1,185,917 Construction and land development 2,210 — 2,210 903,850 — 3,205 3,408 912,673 Commercial and industrial 4,475 — 4,475 2,879,740 — 6,971 524 2,891,710 Consumer and other 7,168 1,081 8,249 257,405 — 475 — 266,129 $ 21,196 $ 1,134 $ 22,330 $ 8,400,018 $ — $ 18,740 $ 8,837 $ 8,449,925 (1) Approximately $45.8 million and $16.7 million of nonaccrual loans as of December 31, 2017 and 2016 , respectively, are currently performing pursuant to their contractual terms. The following table details the changes in the allowance for loan losses from December 31, 2015 to December 31, 2016 to December 31, 2017 by loan classification and the allocation of allowance for loan losses (in thousands): Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer and other Unallocated Total Allowance for Loan Losses: Balance at December 31, 2014 $ 22,202 $ 5,424 $ 5,724 $ 29,167 $ 1,570 $ 3,272 $ 67,359 Charged-off loans (384 ) (365 ) (190 ) (2,207 ) (18,002 ) — (21,148 ) Recovery of previously charged-off loans 85 874 1,479 1,730 5,865 — 10,033 Provision for loan losses (6,390 ) 1,287 (4,110 ) (5,047 ) 26,183 (2,735 ) 9,188 Balance at December 31, 2015 $ 15,513 $ 7,220 $ 2,903 $ 23,643 $ 15,616 $ 537 $ 65,432 Collectively evaluated for impairment $ 15,452 $ 6,109 $ 2,891 $ 22,669 $ 12,609 $ 59,730 Individually evaluated for impairment 61 1,111 12 974 3,007 5,165 Loans acquired with deteriorated credit quality — — — — — — Balance at December 31, 2015 $ 15,513 $ 7,220 $ 2,903 $ 23,643 $ 15,616 $ 537 $ 65,432 Loans: Collectively evaluated for impairment $ 2,269,439 $ 1,033,479 $ 740,090 $ 2,222,714 $ 240,066 $ 6,505,788 Individually evaluated for impairment 2,420 8,986 3,689 5,288 4,930 25,313 Loans acquired with deteriorated credit quality 3,624 4,052 3,918 540 — 12,134 Balance at December 31, 2015 $ 2,275,483 $ 1,046,517 $ 747,697 $ 2,228,542 $ 244,996 $ 6,543,235 Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer and other Unallocated Total Allowance for Loan Losses: Balance at December 31, 2015 $ 15,513 $ 7,220 $ 2,903 $ 23,643 $ 15,616 $ 537 $ 65,432 Charged-off loans (276 ) (788 ) (231 ) (5,801 ) (24,016 ) — (31,112 ) Recovery of previously charged-off loans 208 546 545 2,138 2,895 — 6,332 Provision for loan losses (1,790 ) (414 ) 407 4,763 15,025 337 18,328 Balance at December 31, 2016 $ 13,655 $ 6,564 $ 3,624 $ 24,743 $ 9,520 $ 874 $ 58,980 Collectively evaluated for impairment $ 13,595 $ 5,874 $ 3,604 $ 24,648 $ 9,293 $ 57,014 Individually evaluated for impairment 60 690 20 95 227 1,092 Loans acquired with deteriorated credit quality — — — — — — Balance at December 31, 2016 $ 13,655 $ 6,564 $ 3,624 $ 24,743 $ 9,520 $ 874 $ 58,980 Loans: Collectively evaluated for impairment $ 3,188,361 $ 1,174,456 $ 906,053 $ 2,872,855 $ 265,613 $ 8,407,338 Individually evaluated for impairment 2,750 8,941 3,212 18,331 516 33,750 Loans acquired with deteriorated credit quality 2,385 2,520 3,408 524 — 8,837 Balance at December 31, 2016 $ 3,193,496 $ 1,185,917 $ 912,673 $ 2,891,710 $ 266,129 $ 8,449,925 Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer and other Unallocated Total Allowance for Loan Losses: Balance at December 31, 2016 $ 13,655 $ 6,564 $ 3,624 $ 24,743 $ 9,520 $ 874 $ 58,980 Charged-off loans (633 ) (1,461 ) (137 ) (4,297 ) (15,518 ) — (22,047 ) Recovery of previously charged-off loans 671 1,516 1,136 1,317 2,002 — 6,642 Provision for loan losses 7,495 (1,588 ) 4,339 3,100 9,870 448 23,664 Balance at December 31, 2017 $ 21,188 $ 5,031 $ 8,962 $ 24,863 $ 5,874 $ 1,322 $ 67,240 Collectively evaluated for impairment $ 20,753 $ 4,460 $ 8,879 $ 23,181 $ 5,874 $ 63,147 Individually evaluated for impairment 95 410 66 1,627 — 2,198 Loans acquired with deteriorated credit quality 340 161 17 55 — 573 Balance at December 31, 2017 $ 21,188 $ 5,031 $ 8,962 $ 24,863 $ 5,874 $ 1,322 $ 67,240 Loans: Collectively evaluated for impairment $ 6,630,593 $ 2,534,996 $ 1,896,553 $ 4,116,677 $ 352,663 $ 15,531,482 Individually evaluated for impairment 18,214 12,172 5,167 23,426 — 58,979 Loans acquired with deteriorated credit quality 20,803 14,046 6,568 1,238 — 42,655 Balance at December 31, 2017 $ 6,669,610 $ 2,561,214 $ 1,908,288 $ 4,141,341 $ 352,663 $ 15,633,116 The adequacy of the allowance for loan losses is assessed at the end of each calendar quarter. The level of the allowance is based upon evaluation of the loan portfolio, historical loss experience, current asset quality trends, known and inherent risks in the portfolio, adverse situations that may affect the borrowers' ability to repay (including the timing of future payment), the estimated value of any underlying collateral, composition of the loan portfolio, economic conditions, historical loss experience, industry and peer bank loan quality indications and other pertinent factors, including regulatory recommendations. At December 31, 2017 , Pinnacle Financial had granted loans and other extensions of credit amounting to approximately $26.4 million to current directors, executive officers, and their related entities, of which $16.1 million had been drawn upon. At December 31, 2016 , Pinnacle Financial had granted loans and other extensions of credit amounting to approximately $22.6 million to directors, executive officers, and their related entities, of which approximately $14.8 million had been drawn upon. These loans and extensions of credit were made in the ordinary course of business. None of these loans to directors, executive officers, and their related entities were impaired at December 31, 2017 or 2016 . Residential Lending At December 31, 2017 , Pinnacle Financial had approximately $103.7 million of mortgage loans held-for-sale compared to approximately $47.7 million at December 31, 2016 . Total loan volumes sold during the year ended December 31, 2017 were approximately $1.1 billion compared to approximately $803.5 million for the year ended December 31, 2016 . During the year ended December 31, 2017 , Pinnacle Financial recognized $18.6 million in gains on the sale of these loans, net of commissions paid, compared to $15.8 million and $7.7 million , respectively, during the years ended December 31, 2016 and 2015 . These mortgage loans held-for-sale are originated internally and are primarily to borrowers in Pinnacle Bank's geographic markets. These sales are typically on a mandatory basis to investors that follow conventional government sponsored entities (GSE) and the Department of Housing and Urban Development/U.S. Department of Veterans Affairs (HUD/VA) guidelines. Each purchaser has specific guidelines and criteria for sellers of loans, and the risk of credit loss with regard to the principal amount of the loans sold is generally transferred to the purchasers upon sale. While the loans are sold without recourse, the purchase agreements require Pinnacle Bank to make certain representations and warranties regarding the existence and sufficiency of file documentation and the absence of fraud by borrowers or other third parties such as appraisers in connection with obtaining the loan. If it is determined that the loans sold were in breach of these representations or warranties, Pinnacle Bank has obligations to either repurchase the loan for the unpaid principal balance and related investor fees or make the purchaser whole for the economic benefits of the loan. To date, repurchase activity pursuant to the terms of these representations and warranties has been insignificant to Pinnacle Bank.

Mortgage Servicing Rights

Mortgage Servicing Rights	12 Months Ended
	Dec. 31, 2015
Mortgage Servicing Rights [Abstract]
Mortgage Servicing Rights	Note 7. Mortgage Servicing Rights Mortgage servicing rights (MSRs) are recorded at the lower of cost or market in "Other assets" on Pinnacle Financial's consolidated balance sheets and are amortized over the remaining life of the loans and written off when a mortgage loan prepays prior to maturity. Mortgage servicing rights had the following carrying values as of December 31, 2015 (in thousands): 2015 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Mortgage servicing rights $ 6,802 $ (390 ) $ 6,412 The following table provides a detail of changes in the mortgage servicing right from September 1, 2015, the closing date of the Magna Merger, to December 31, 2015: Residential Beginning balance acquired in Magna Merger $ 6,641 Add: Capitalized MSRs 161 Less: Amortization 390 Ending balance $ 6,412 Income and expense associated with these MSRs, which includes servicing fees, late charges, guarantee fees and loan payoff interest, is recorded on a cash basis which approximates income as would be recorded on a U.S. GAAP basis. The following table summarizes the net servicing fee revenues for the year ended December 31, 2015 (in thousands): Residential Gross servicing fees $ 1,090 Late charges and other ancillary revenue 160 Gross servicing revenue $ 1,250 Servicing asset amortization $ 386 Guaranty fees and loan pay-off interest 9 Other servicing expenses 51 Gross servicing expenses $ 446 Net servicing fee income $ 804 During the first quarter of 2016, in conjunction with a decision to exit the residential servicing line of business, Pinnacle Bank sold the mortgage servicing rights associated with the $830 million Fannie Mae portion of the residential servicing portfolio for $6.6 million , net of associated costs to sell. Approximately $241,000 was recorded as income during the year ended December 31, 2016 as a result of the sale.

Premises and Equipment and Leas

Premises and Equipment and Lease Commitments	12 Months Ended
	Dec. 31, 2017
Premises and Equipment and Lease Commitments [Abstract]
Premises and Equipment and Lease Commitments	Note 8. Premises and Equipment and Lease Commitments Premises and equipment at December 31, 2017 and 2016 are summarized as follows (in thousands): Range of Useful Lives 2017 2016 Land Not applicable $ 65,649 $ 19,467 Buildings 15 to 30 years 164,748 64,088 Leasehold improvements 15 to 20 years 38,913 28,789 Furniture and equipment 3 to 20 years 93,841 62,982 363,151 175,326 Accumulated depreciation and amortization (97,137 ) (86,422 ) $ 266,014 $ 88,904 Depreciation and amortization expense was approximately $13.7 million , $9.9 million , and $8.5 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. Pinnacle Financial has entered into various operating leases, primarily for office space and branch facilities. Rent expense related to these leases for 2017 , 2016 and 2015 totaled $11.7 million , $8.4 million and $5.9 million , respectively. At December 31, 2017 , the approximate future minimum lease payments due under the aforementioned operating leases for their base term are as follows (in thousands): 2018 $ 12,226 2019 11,535 2020 10,949 2021 10,652 2022 8,429 Thereafter 42,857 $ 96,648 During 2016 and as a result of the acquisition of Avenue, Pinnacle Financial has entered into a single capital lease, primarily for office space at an interest rate of 7.22% per year. Rent expense related to this lease for 2017 was approximately $225,000 and is included in total rent expense above. At December 31, 2017 , the approximate future minimum lease payments due under the aforementioned capital lease for its base term are as follows (in thousands): 2018 $ 426 2019 470 2020 470 2021 470 2022 470 Thereafter 3,028 Total minimum lease payments $ 5,334 Less: amount representing interest (1,695 ) Present value of net minimum lease payments $ 3,639

Deposits

Deposits	12 Months Ended
	Dec. 31, 2017
Interest-bearing Deposit Liabilities [Abstract]
Deposits	Note 9. Deposits At December 31, 2017 , the scheduled maturities of time deposits are as follows (in thousands): 2018 $ 1,850,523 2019 445,198 2020 123,000 2021 95,754 2022 17,244 Thereafter 2,342 $ 2,534,061 Additionally, at December 31, 2017 and 2016 , approximately $1.3 billion and $602.9 million , respectively, of time deposits had been issued in denominations of $100,000 or greater. At December 31, 2017 and 2016 , Pinnacle Financial had $3.5 million and $1.9 million , respectively, of deposit accounts in overdraft status and thus have been reclassified to loans on the accompanying consolidated balance sheets.

Federal Home Loan Bank Advances

Federal Home Loan Bank Advances	12 Months Ended
	Dec. 31, 2016
Advances from Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Advances	Note 10. Federal Home Loan Bank Advances Pinnacle Bank is a member of the Federal Home Loan Bank of Cincinnati (FHLB) and as a result, is eligible for advances from the FHLB pursuant to the terms of various borrowing agreements, which assist Pinnacle Bank in the funding of its home mortgage and commercial real estate loan portfolios. Pinnacle Bank has pledged certain qualifying residential mortgage loans and, pursuant to a blanket lien, certain qualifying commercial mortgage loans with an aggregate carrying value of approximately $5.5 billion as collateral under the borrowing agreements with the FHLB. At December 31, 2017 and 2016 , Pinnacle Financial had received advances from the FHLB totaling $1.3 billion and $406.2 million , respectively. Additionally, Pinnacle Financial recognized a discount of $167,000 on FHLB advances in conjunction with its acquisition of Avenue in July 2016. At December 31, 2017 and 2016, respectively, the remaining discount was $13,000 and $92,000 . At December 31, 2017 , the scheduled maturities of FHLB advances and interest rates are as follows (in thousands): Scheduled Maturities Weighted average interest rates 2018 $ 557,501 1.46 % 2019 356,000 1.64 % 2020 272,627 1.74 % 2021 133,750 1.87 % 2022 — — Thereafter 17 2.75 % $ 1,319,895 Weighted average interest rate 1.61 % At December 31, 2017 , Pinnacle Bank had accommodations which allow it to borrow from the Federal Reserve Bank of Atlanta's discount window and purchase Federal funds from several of its correspondent banks on an overnight basis at prevailing overnight market rates. These accommodations are subject to various restrictions as to their term and availability, and in most cases, must be repaid within less than a month. At December 31, 2017 , Pinnacle Bank had approximately $4.3 billion in borrowing availability with the FHLB, the Federal Reserve Bank discount window, and other correspondent banks with whom Pinnacle Bank has arranged lines of credit. At December 31, 2017 , Pinnacle Bank was not carrying any balances with the Federal Reserve Bank discount window or correspondent banks under these arrangements.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 12. Income Taxes Income tax expense attributable to continuing operations for each of the years ended December 31 is as follows (in thousands): 2017 2016 2015 Current tax expense : Federal $ 63,496 $ 49,769 $ 41,721 State 860 — 48 Total current tax expense 64,356 49,769 41,769 Deferred tax expense: Federal 26,339 12,776 4,963 State 1,826 1,614 857 Deferred tax revaluation expense 31,486 — — Total deferred tax expense 59,651 14,390 5,819 Total income tax expense $ 124,007 $ 64,159 $ 47,589 Pinnacle Financial's income tax expense differs from the amounts computed by applying the Federal income tax statutory rates of 35% to income (loss) before income taxes. A reconciliation of the differences for each of the years in the three-year period ended December 31, 2017 is as follows (in thousands): 2017 2016 2015 Income tax expense at statutory rate $ 104,295 $ 66,984 $ 50,084 State excise tax expense, net of federal tax effect 1,746 1,049 588 Tax-exempt securities (5,666 ) (2,510 ) (2,543 ) Federal tax credits (434 ) (282 ) — Bank owned life insurance (2,778 ) (1,242 ) (892 ) Insurance premiums (283 ) (159 ) (306 ) Revaluation of deferred tax assets and liabilities due to Tax Cuts and Jobs Act 31,486 — — Excess tax benefits associated with equity compensation (5,365 ) — — Change in uncertain tax positions — — — Other items 1,006 319 658 Income tax expense $ 124,007 $ 64,159 $ 47,589 Pinnacle Financial's effective tax rate for 2017 and 2016 differs from the statutory income tax rates primarily due to a state excise tax expense, investments in bank qualified municipal securities, our real estate investment trust, participation in the Community Investment Tax Credit (CITC) program, and bank owned life insurance, offset in part by the limitation on deductibility of meals and entertainment expense, certain merger-related expenses and the deferred tax asset revaluation in 2017 pursuant to the enactment of the Tax Cuts and Jobs Act. On December 22, 2017, the Tax Cuts and Jobs Act was signed into law. Among other items, the Tax Cuts and Jobs Act reduced the corporate statutory tax rate from 35% to 21%. As a result of such decrease, Pinnacle Financial recognized a charge of $31.5 million in 2017 resulting from the revaluation of its deferred tax assets. The components of deferred income taxes included in other assets in the accompanying consolidated balance sheets at December 31, 2017 and 2016 are as follows (in thousands): 2017 2016 Deferred tax assets: Loan loss allowance $ 16,240 $ 22,308 Loans 46,567 15,534 Insurance 614 869 Accrued liability for supplemental retirement agreements 7,413 5,587 Restricted stock and stock options 8,232 8,643 Securities — 4,275 Cash flow hedge 499 1,520 Equity method investment 635 858 Leases 1,738 1,627 Other real estate owned 2,809 149 Net federal operating loss carryforward and credits 18,085 — Other deferred tax assets 5,373 6,413 Total deferred tax assets 108,205 67,783 Deferred tax liabilities: Depreciation and amortization 11,504 5,823 Core deposit intangible asset 14,073 5,621 Securities 616 — REIT dividends 3,073 4,602 FHLB related liabilities 922 285 Subordinated debt 1,077 1,001 Other deferred tax liabilities 1,171 679 Total deferred tax liabilities 32,436 18,011 Net deferred tax assets $ 75,769 $ 49,772 ASC 740, Income Taxes , defines the threshold for recognizing the benefits of tax return positions in the financial statements as "more-likely-than-not" to be sustained by the taxing authority. This section also provides guidance on the derecognition, measurement and classification of income tax uncertainties, along with any related interest and penalties, and includes guidance concerning accounting for income tax uncertainties in interim periods. At December 31, 2017, the Company had federal and state loss and tax credit carryforwards of approximately $18.5 million that expire at various dates from 2027 to 2036. On December 22, 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provides guidance on accounting for the tax effects of the Tax Cuts and Jobs Act. SAB 118 provides a measurement period that should not extend beyond one year from the Tax Cuts and Jobs Act's enactment date for companies to complete the accounting under ASC 740, Income Taxes. The Company’s financial results reflect the income tax effects of the Tax Cuts and Jobs Act for which the accounting under ASC Topic 740 is complete and provisional amounts for those specific income tax effects of the Tax Cuts and Jobs Act for which the accounting under ASC Topic 740 is incomplete but a reasonable estimate could be determined. A reconciliation of the beginning and ending unrecognized tax benefit related to state uncertain tax positions is as follows (in thousands): 2017 2016 2015 Balance at January 1, $ 1,274 $ 134 $ 391 Increases (decreases) due to tax positions taken during the current year 1,564 1,140 (257 ) Increases due to tax positions taken during a prior year — — — Decreases due to the lapse of the statute of limitations during the current year — — — Decreases due to settlements with the taxing authorities during the current year — — — Balance at December 31, $ 2,838 $ 1,274 $ 134 Pinnacle Financial's policy is to recognize interest and/or penalties related to income tax matters in income tax expense. No interest and penalties were recorded for the year ended December 31, 2017 .

Commitments and Contingent Liab

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	Note 13. Commitments and Contingent Liabilities In the normal course of business, Pinnacle Financial has entered into off-balance sheet financial instruments which include commitments to extend credit (i.e., including unfunded lines of credit) and standby letters of credit. Commitments to extend credit are usually the result of lines of credit granted to existing borrowers under agreements that the total outstanding indebtedness will not exceed a specific amount during the term of the indebtedness. Typical borrowers are commercial concerns that use lines of credit to supplement their treasury management functions, thus their total outstanding indebtedness may fluctuate during any time period based on the seasonality of their business and the resultant timing of their cash flows. Other typical lines of credit are related to home equity loans granted to consumers. Commitments to extend credit generally have fixed expiration dates or other termination clauses and may require payment of a fee. At December 31, 2017 , these commitments amounted to $5.8 billion , of which approximately $887.6 million related to home equity lines of credit. Standby letters of credit are generally issued on behalf of an applicant (customer) to a specifically named beneficiary and are the result of a particular business arrangement that exists between the applicant and the beneficiary. Standby letters of credit have fixed expiration dates and are usually for terms of two years or less unless terminated beforehand due to criteria specified in the standby letter of credit. A typical arrangement involves the applicant routinely being indebted to the beneficiary for such items as inventory purchases, insurance, utilities, lease guarantees or other third party commercial transactions. The standby letter of credit would permit the beneficiary to obtain payment from Pinnacle Financial under certain prescribed circumstances. Subsequently, Pinnacle Financial would then seek reimbursement from the applicant pursuant to the terms of the standby letter of credit. At December 31, 2017 , these commitments amounted to $143.7 million . Pinnacle Financial follows the same credit policies and underwriting practices when making these commitments as it does for on-balance sheet instruments. Each customer's creditworthiness is evaluated on a case-by-case basis and the amount of collateral obtained, if any, is based on management's credit evaluation of the customer. Collateral held varies but may include cash, real estate and improvements, marketable securities, accounts receivable, inventory, equipment, and personal property. The contractual amounts of these commitments are not reflected in the consolidated financial statements and would only be reflected if drawn upon. Since many of the commitments are expected to expire without being drawn upon, the contractual amounts do not necessarily represent future cash requirements. However, should the commitments be drawn upon and should our customers default on their resulting obligation to us, Pinnacle Financial's maximum exposure to credit loss, without consideration of collateral, is represented by the contractual amount of those instruments. At December 31, 2017 , Pinnacle Financial had accrued $3.1 million for the inherent risks associated with off balance sheet commitments. Various legal claims also arise from time to time in the normal course of business. In the opinion of management, the resolution of these routine claims outstanding at December 31, 2017 will not have a material impact on Pinnacle Financial's consolidated financial condition, operating results or cash flows.

Salary Deferral Plans

Salary Deferral Plans	12 Months Ended
	Dec. 31, 2017
Deferred Compensation Arrangements [Abstract]
Salary Deferral Plans	Note 14. Salary Deferral Plans Pinnacle Financial has a 401(k) retirement plan (the 401k Plan) covering all employees who elect to participate, subject to certain eligibility requirements. The Plan allows employees to defer up to 50% of their salary subject to regulatory limitations with Pinnacle Financial matching 100% of the first 4% of employee self-directed contributions during 2017 , 2016 , and 2015 . Pinnacle Financial's expense associated with the matching component of the plan for each of the years in the three-year period ended December 31, 2017 was approximately $5.9 million , $4.0 million and $2.7 million , respectively, and is included in the accompanying consolidated statements of operations in salaries and employee benefits expense. Pinnacle Financial assumed nonqualified noncontributory supplemental retirement agreements (the Cavalry SRAs) for certain directors and executive officers of Cavalry Bancorp, Inc. (Cavalry), which Pinnacle Financial acquired in 2006. During 2007, Pinnacle Financial offered a settlement to all participants in the Cavalry SRAs with eleven participants accepting the settlement. One individual remains as a participant in the Cavalry SRAs. At December 31, 2017 , 2016 and 2015 , included in other liabilities is $1.0 million , $1.2 million , and $1.3 million , respectively, which represents the net present value of the future obligation owed the remaining participant in the Cavalry SRAs using a discount rate of 5% at December 31, 2017 , 2016 and 2015 . In conjunction with other completed acquisitions, Pinnacle has assumed $33.0 million in liabilities associated with existing supplemental executive retirement plans, of which $20.0 million have been fully funded with rabbi trusts. The remaining amounts that are not funded are included in other liabilities in the accompanying consolidated balance sheets.

Stock Options, Stock Appreciati

Stock Options, Stock Appreciation Rights, Restricted Shares and Salary Stock Units	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options, Stock Appreciation Rights, Restricted Shares and Salary Stock Units	Note 15. Stock Options, Stock Appreciation Rights and Restricted Shares As of December 31, 2017 , Pinnacle Financial has two equity incentive plans under which it is able to grant awards, the 2014 Equity Incentive Plan (2014 Plan) and the BNC Bancorp 2013 Amended and Restated Omnibus Stock Incentive Plan (BNC Plan) it assumed in connection with the BNC Merger. Pinnacle Financial also assumed the stock option plan of CapitalMark (the CapitalMark Option Plan) it assumed in connection with the CapitalMark Merger but Pinnacle Financial is not able to grant awards thereunder. In addition, awards previously granted remain outstanding under equity plans previously adopted by Pinnacle Financial's board of directors and shareholders. No new awards may be granted under plans other than the 2014 Plan, or in the case of associates that were former associates of BNC or its subsidiaries, the BNC Plan. Total shares available for issuance under the 2014 Plan were approximately 672,000 shares as of December 31, 2017 , inclusive of shares returned to plan reserves during the year ended December 31, 2017 . The 2014 Plan also permits Pinnacle Financial to issue additional awards to the extent that currently outstanding awards are subsequently forfeited, settled in cash, transferred to Pinnacle Financial in satisfaction of withholding tax obligations on vested awards or expired unexercised and returned to the 2014 Plan. Upon the acquisition of CapitalMark, Pinnacle Financial assumed approximately 858,000 of stock options under the CapitalMark Plan. No further shares remain available for issuance under the CapitalMark Option Plan. There were approximately 29,000 shares available for issuance under the BNC Plan as of December 31, 2017. No options were assumed upon the acquisition of Magna, Avenue or BNC as all preexisting Magna, Avenue and BNC stock options were converted to cash upon acquisition. Common Stock Options and Stock Appreciation Rights As of December 31, 2017 , of the 274,586 stock options outstanding, approximately 113,061 options were granted with the intention to be incentive stock options qualifying under Section 422 of the Internal Revenue Code for favorable tax treatment to the option holder while approximately 161,525 options would be deemed non-qualified stock options and thus not subject to favorable tax treatment to the option holder. Favorable treatment generally refers to the recipient of the award not having to report ordinary income at the date of exercise. All stock options granted under the Pinnacle Financial equity incentive plans vested in equal increments over five years from the date of grant, are fully vested as of December 31, 2017 and are exercisable over a period of ten years from the date of grant. All stock options granted under the CapitalMark Plan were fully vested at the date of the CapitalMark merger. A summary of stock option and stock appreciation right activity within the equity incentive plans during each of the years in the three-year period ended December 31, 2017 and information regarding expected vesting, contractual terms remaining, intrinsic values and other matters was as follows: Number Weighted- Average Exercise Price Weighted- Average Contractual Remaining Term (in years) Aggregate Intrinsic Value (1) (000's) Outstanding at December 31, 2014 698,488 $ 26.89 Options acquired upon acquisition of CapitalMark 858,148 17.62 Granted — — Stock options exercised (303,754 ) 24.09 Stock appreciation rights exercised (2) (1,276 ) 15.60 Forfeited (5 ) 23.88 Outstanding at December 31, 2015 1,251,601 $ 21.23 Granted — — Stock options exercised (698,673 ) 21.63 Stock appreciation rights exercised (2) (2,435 ) 15.60 Forfeited (3 ) 29.50 Outstanding at December 31, 2016 550,490 $ 20.75 Granted — — Stock options exercised (3) (275,904 ) 20.09 Forfeited — — Outstanding at December 31, 2017 274,586 $ 21.40 3.06 $ 12,329 Options exercisable at December 31, 2017 274,586 $ 21.40 3.06 $ 12,329 (1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted price of Pinnacle Financial Common Stock of $66.30 per common share at December 31, 2017 for the 274,586 options that were in-the-money at December 31, 2017 . (2) The 1,276 stock appreciation rights exercised during 2015 settled in 559 shares of Pinnacle Financial Common Stock. The 2,435 stock appreciation rights exercised during 2016 settled in 1,137 shares of Pinnacle Financial Common Stock. (3) Includes 750 stock options which were exercised in a stock swap transaction which settled in 277 shares of Pinnacle Financial common stock. During each of the years in the three-year period ended December 31, 2017 , the aggregate intrinsic value of stock options and stock appreciation rights exercised under Pinnacle Financial's equity incentive plans was $12.3 million , $21.7 million and $7.6 million , respectively, determined as of the date of option exercise. There have been no options granted by Pinnacle Financial since 2008. All stock option awards granted by Pinnacle Financial were fully vested during 2013. Stock options granted under the CapitalMark Plan were fully vested at the time of acquisition. As such, there was no impact on the results of operations for stock-based compensation related to stock options for the three-year period ended December 31, 2017 . Restricted Shares Additionally, the 2014 Plan and the BNC Plan provide for the granting of restricted share awards and other performance or market-based awards. There were no market-based awards or stock appreciation rights outstanding as of December 31, 2017 under the 2014 Plan or the BNC Plan. During the three-year period ended December 31, 2017 , Pinnacle Financial awarded 261,942 , 177,664 and 231,504 shares of restricted stock to certain Pinnacle Financial associates and outside directors. A summary of activity for unvested restricted share awards for the years ended December 31, 2017 , 2016 , and 2015 follows: Number Grant Date Weighted-Average Cost Unvested at December 31, 2014 849,198 $ 24.26 Shares awarded 231,504 45.71 Conversion of previously granted restricted share units to restricted share awards 43,711 34.50 Restrictions lapsed and shares released to associates/directors (240,102 ) 23.00 Shares forfeited (17,997 ) 30.01 Unvested at December 31, 2015 866,314 $ 31.39 Shares awarded 177,664 48.61 Conversion of previously granted restricted share units to restricted share awards 43,694 46.37 Restrictions lapsed and shares released to associates/directors (245,873 ) 28.39 Shares forfeited (21,260 ) 39.88 Unvested at December 31, 2016 820,539 $ 36.47 Shares awarded 261,942 67.14 Conversion of previously granted restricted share units to restricted share awards 43,680 69.40 Shares assumed in connection with acquisition of BNC 136,890 67.25 Restrictions lapsed and shares released to associates/directors (292,896 ) 37.59 Shares forfeited (34,020 ) 54.71 Unvested at December 31, 2017 936,135 $ 50.08 Pinnacle Financial grants restricted share awards to associates (including members of executive management) and outside directors with a combination of time and, in the case of executive management, performance vesting criteria. The following tables outline restricted stock grants that were made by grant year, grouped by similar vesting criteria, during the three year period ended December 31, 2017 . The table below reflects the life-to-date activity for these awards: Grant Year Group (1) Vesting Period in years Shares awarded Restrictions Lapsed and shares released to participants Shares Withheld for taxes by participants Shares Forfeited by participants (9) Shares Unvested Time Based Awards 2015 Associates (2) 5 190,528 53,574 19,405 19,136 98,413 2015 Leadership team (3) 5 16,605 2,530 788 — 13,287 2016 Associates (2) 5 143,273 19,490 7,316 15,126 101,341 2017 Associates (2) 3 - 5 248,265 388 198 14,085 233,594 2017 Associates (2) (4) 3 - 5 136,890 40,317 — — 96,573 Performance Based Awards 2015 Leadership team (5) 5 43,711 — — — 43,711 2015 Leadership team (6) 3 11,302 2,679 1,086 — 7,537 2016 Leadership team (5) 3 43,694 — — — 43,694 2016 Leadership team (7) 3 15,468 — — — 15,468 2017 Leadership team (5) 3 43,680 — — — 43,680 Outside Director Awards (8) 2015 Outside directors 1 13,069 11,298 1,771 — — 2016 Outside directors 1 18,923 15,471 2,266 1,186 — 2017 Outside directors 1 13,677 2,376 796 — 10,505 (1) Groups include employees (referred to as associates above), the leadership team which includes our named executive officers and other key senior leadership members, and outside directors. When the restricted shares are awarded, a participant receives voting rights and forfeitable dividend rights with respect to the shares, but is not able to transfer the shares until the restrictions have lapsed. Once the restrictions lapse, the participant is taxed on the value of the award and may elect to sell some shares (or have Pinnacle Financial withhold some shares) to pay the applicable income taxes associated with the vested portion of the award. For time-based vesting restricted share awards, dividends paid on shares for which the forfeiture restrictions do not lapse will be recouped by Pinnacle Financial at the time of termination. For performance-based vesting awards, dividends are placed into escrow until the forfeiture restrictions on such shares lapse. (2) The forfeiture restrictions on these restricted share awards lapse in equal annual installments on the anniversary date of the grant. (3) These shares were awarded to individuals joining the leadership team upon acquisition of Magna. The forfeiture restrictions on these restricted share awards lapse in equal installments on the anniversary date of the grant. (4) Restricted share awards issued to associates that were former associates of BNC in connection with the acquisition of BNC. (5) Reflects settlement of restricted share units issued in prior years in restricted share awards. The forfeiture restrictions on these restricted share awards lapse in separate equal installments should Pinnacle Financial achieve certain soundness targets over each year of the subsequent vesting period. Half of the awards include a four-year vesting period while the remainder include a three-year vesting period. (6) These shares were awarded to individuals joining the leadership team upon acquisition of CapitalMark. The forfeiture restrictions on these restricted share awards lapse in separate equal installments should Pinnacle Financial achieve certain earnings targets over each year of the vesting period and should the recipient thereafter remain employed by Pinnacle Financial for a subsequent vesting period. (7) These shares were awarded to individuals joining the leadership team upon acquisition of Avenue. The forfeiture restrictions on these restricted share awards lapse in separate equal installments should Pinnacle Financial achieve certain earnings targets over each year of the vesting period and should the recipient thereafter remain employed by Pinnacle Financial for a subsequent vesting period. (8) Restricted share awards are issued to the outside members of the board of directors in accordance with their board compensation plan. Restrictions lapse on the one year anniversary date of the award based on each individual board member meeting attendance goals for the various board and board committee meetings to which each member was scheduled to attend. (9) These shares represent forfeitures resulting from recipients whose employment or board membership terminated during the year ended December 31, 2017 . Any dividends paid on shares for which the forfeiture restrictions do not lapse will be recouped by Pinnacle Financial at the time of termination or will not be distributed from escrow, as applicable. Compensation expense associated with the performance-based vesting restricted share awards is recognized over the time period that the restrictions associated with the awards are anticipated to lapse based on a graded vesting schedule such that each traunche is amortized separately. Compensation expense associated with the time-based vesting restricted share awards is recognized over the time period that the restrictions associated with the awards lapse on a straight-line basis based on the total cost of the award. Restricted Share Units The following table details the restricted share unit awards outstanding at December 31, 2017 : Units Awarded Applicable Performance Periods associated with each tranche (fiscal year) Service period per tranche (in years) Subsequent holding period per tranche (in years) Shares settled into RSAs as of period end (2) Grant year Named Executive Officers (NEOs) (1) Leadership Team other than NEOs 2017 72,537-109,339 24,916 2017 2 3 N/A 2018 2 2 N/A 2019 2 1 N/A 2016 73,474-110,223 26,683 2016 2 3 N/A 2017 2 2 N/A 2018 2 1 N/A 2015 58,200-101,850 28,378 2015 2 3 N/A 2016 2 2 N/A 2017 2 1 N/A 2014 (3) 58,404-102,209 29,087 2014 5 N/A 21,856 2014 4 N/A 21,856 2015 4 N/A 21,847 2015 3 N/A 21,847 2016 3 N/A 21,840 2016 2 N/A 21,840 (1) The named executive officers are awarded a range of awards that may be earned based on attainment of goals at a target level of performance to the maximum level of performance. (2) Performance-based vesting restricted stock unit awards granted in 2017 , 2016 and 2015 if earned will be settled in shares of Pinnacle Financial Common Stock. (3) Restrictions on half of the shares issued as restricted share awards in settlement of units will lapse commensurate with the filing of the Form 10-K for the year ended December 31, 2018 and 2019 , respectively, and are reflected as restricted stock awards in the year in which the shares are issued in settlement of the units. A summary of stock compensation expense, net of the impact of income taxes, related to restricted share awards and restricted share units for the three-year period ended December 31, 2017 , follows (in thousands except per share data): 2017 2016 2015 Restricted stock expense $ 19,538 $ 10,971 $ 6,033 Income tax benefit 7,665 4,306 2,368 Restricted stock expense, net of income tax benefit $ 11,873 $ 6,665 $ 3,665 As of the December 31, 2017, the total compensation cost related to unvested restricted share awards and restricted share units not yet recognized was $30.9 million. This expense is expected to be recognized over a weighted-average period of 2.98 years.

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Note 16. Derivative Instruments Financial derivatives are reported at fair value in other assets or other liabilities. The accounting for changes in the fair value of a derivative depends on whether it has been designated and qualifies as part of a hedging relationship. For derivatives not designated as hedges, the gain or loss is recognized in current earnings. Non-hedge derivatives Pinnacle Financial enters into interest rate swaps (swaps) to facilitate customer transactions and meet their financing needs. Upon entering into these instruments to meet customer needs, Pinnacle Financial enters into offsetting positions in order to minimize the risk to Pinnacle Financial. These swaps qualify as derivatives, but are not designated as hedging instruments. Interest rate swap contracts involve the risk of dealing with counterparties and their ability to meet contractual terms. When the fair value of a derivative instrument contract is positive, this generally indicates that the counter party or customer owes Pinnacle Financial, and results in credit risk to Pinnacle Financial. When the fair value of a derivative instrument contract is negative, Pinnacle Financial owes the customer or counterparty and therefore, Pinnacle Financial has no credit risk. A summary of Pinnacle Financial's interest rate swaps to facilitate customer transactions as of December 31, 2017 and December 31, 2016 is included in the following table (in thousands): December 31, 2017 December 31, 2016 Notional Amount Estimated Fair Value Notional Amount Estimated Fair Value Interest rate swap agreements: Pay fixed / receive variable swaps $ 748,625 $ 13,771 $ 666,572 $ 16,004 Pay variable / receive fixed swaps 748,625 (13,866 ) 666,572 (16,138 ) Total $ 1,497,250 $ (95 ) $ 1,333,144 $ (134 ) Hedge derivatives Pinnacle Financial has forward cash flow hedge relationships to manage future interest rate exposure. The hedging strategy converts the LIBOR-based variable interest rate on forecasted borrowings to a fixed interest rate and protects Pinnacle Financial from floating interest rate variability. A summary of Pinnacle Financial's cash flow hedge relationships as of December 31, 2017 and 2016 are as follows (in thousands): December 31, 2017 December 31, 2016 Forecasted Notional Amount Receive Rate Pay Rate Term(1) Asset/ (Liabilities) Unrealized Loss in Accumulated Other Comprehensive Income Asset/ (Liabilities) Unrealized Loss in Accumulated Other Comprehensive Income Interest Rate Swap $ 33,000 3 month LIBOR 2.265 % April 2016 - April 2020 (146 ) (89 ) (727 ) (442 ) Interest Rate Swap 33,000 3 month LIBOR 2.646 % April 2016 - April 2022 (647 ) (393 ) (1,304 ) (792 ) Interest Rate Swap 33,000 3 month LIBOR 2.523 % Oct. 2016 - Oct. 2020 (382 ) (232 ) (1,081 ) (657 ) Interest Rate Swap 33,000 3 month LIBOR 2.992 % Oct. 2017 - Oct. 2021 (998 ) (606 ) (1,200 ) (729 ) Interest Rate Swap 34,000 3 month LIBOR 3.118 % April 2018 - July 2022 (1,205 ) (732 ) (1,222 ) (743 ) Interest Rate Swap 34,000 3 month LIBOR 3.158 % July 2018 - Oct. 2022 (1,205 ) (733 ) (1,198 ) (728 ) $ 200,000 (4,583 ) (2,785 ) (6,732 ) (4,091 ) (1) No cash will be exchanged prior to the beginning of the term. Pinnacle Financial has interest rate swap agreements designated as cash flow hedges intended to protect against the variability of cash flows on selected LIBOR-based loans. The swaps hedge the interest rate risk, wherein Pinnacle Financial receives a fixed rate of interest from a counterparty and pays a variable rate, based on one month LIBOR. The swaps were entered into with a counterparty that met Pinnacle Financial's credit standards and the agreements contain collateral provisions protecting the at-risk party. The following outlines the interest rate swap agreements in place at December 31, 2017 and December 31, 2016 (in thousands): December 31, 2017 December 31, 2016 Forecasted Notional Amount Receive Rate Pay Rate Term Asset/ (Liabilities) Unrealized Gain (Loss) in Accumulated Other Comprehensive Income Asset/ (Liabilities) Unrealized Gain (Loss) in Accumulated Other Comprehensive Income Interest Rate Swap (1) $ — 2.090 % 1 month LIBOR July 2014 - July 2021 — — 395 240 Interest Rate Swap (1) — 2.270 % 1 month LIBOR July 2014 - July 2022 — — 610 371 Interest Rate Swap (1) — 2.420 % 1 month LIBOR July 2014 - July 2023 — — 874 531 Interest Rate Swap (1) — 2.500 % 1 month LIBOR July 2014 - July 2024 — — 900 547 Interest Rate Swap (1) — 1.470 % 1 month LIBOR August 2015 - August 2020 — — (75 ) (46 ) $ — — — 2,704 1,643 (1) Each of these swaps were terminated via cash settlement in the second quarter of 2017. As a result of terminating these contracts in the second quarter of 2017, Pinnacle Financial began recognizing a gain of $3.1 million over the original terms of these agreements. The cash flow hedges were determined to be fully effective during the periods presented. Therefore, no amount of ineffectiveness has been included in net income. The aggregate fair value of the swaps is recorded in other assets or other liabilities with changes in fair value recorded in accumulated other comprehensive (loss) income, net of tax. If a hedge was deemed to be ineffective, the amount included in accumulated other comprehensive (loss) income would be reclassified into a line item within the statement of income that impacts operating results. The hedge would no longer be considered effective if a portion of the hedge becomes ineffective, the item hedged is no longer in existence or Pinnacle Financial discontinues hedge accounting. Other than the interest rate swaps agreements terminated in the second quarter of 2017, Pinnacle Financial expects the hedges to remain fully effective during the remaining terms of the swaps. Pinnacle Financial does not expect any amounts to be reclassified from accumulated other comprehensive (loss) income related to these swaps over the next twelve months.

Employment Contracts

Employment Contracts	12 Months Ended
	Dec. 31, 2017
Compensation Related Costs [Abstract]
Employment Contracts	Note 17. Employment Contracts Pinnacle Financial has entered into, and subsequently amended employment agreements with four of its senior executives: the President and Chief Executive Officer, the Chairman of the Board, the Chief Administrative Officer and the Chief Financial Officer. These agreements, as amended, automatically renew each year on January 1 for an additional year unless any of the parties to the agreements gives notice of intent not to renew the agreement prior to November 30th of the preceding year, in which case the agreement terminates 30 days later. The agreements specify that in certain defined "Terminating Events," Pinnacle Financial will be obligated to pay each of the four senior executives certain amounts, which vary according to the Terminating Event, which is based on their annual salaries and bonuses. These Terminating Events include termination for disability, cause, without cause and other events. During 2012, Pinnacle Financial entered into, and subsequently amended, a change of control agreement with its Senior Credit Officer providing the employee with certain benefits if his employment is terminated under certain scenarios within twelve months of a change in control. This agreement automatically renews each year on January 1 unless a party to the agreement notifies the other parties of intent not to renew the agreement prior to November 30th of the preceding year, in which case the agreement terminates 30 days later. In connection with the Avenue Merger, Pinnacle Financial entered into an employment agreement with its Vice Chairman. This agreement is on similar terms as the employment agreements with the four senior executives described above, except that it provides for a fixed three -year term and does not automatically renew. In connection with the BNC Merger, Pinnacle Financial entered into an employment agreement with its Chairman of the Carolinas and Virginia. This agreement is on similar terms as the other employment agreements, except that it provides for an initial fixed three-year term and automatic renewal occurs following the initial term in the same manner as the employment agreements of the four senior executives described above. This agreement also provides for the payment of certain deferred benefits under his prior employment agreement with BNC upon termination of his employment with Pinnacle Financial.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	Note 18. Related Party Transactions A local public relations company, of which one of Pinnacle Financial's former directors is a principal, has provided various services for Pinnacle Financial. This director's term ended during the year ended December 31, 2016 and therefore the relationship was no longer considered to be a related party transaction. During the year ended December 31, 2015 Pinnacle Financial incurred no expenses relating to services rendered by this public relations company. During the year ended December 31, 2016, $20,000 in expenses were incurred relating to services rendered by this public relations company. During the year ended December 31, 2017, no expenses were incurred relating to services rendered by this public relations company. Also see Note 6 - "Loans and Allowance for Loan Losses", concerning loans and other extensions of credit to certain directors, officers, and their related entities and individuals and Note 14 – "Salary Deferral Plans" regarding supplemental retirement agreement obligations to certain directors who were formerly directors of acquired banks.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 19. Fair Value of Financial Instruments FASB ASC 820, Fair Value Measurements and Disclosures , which defines fair value, establishes a framework for measuring fair value in U.S. GAAP and expands disclosures about fair value measurements. The definition of fair value focuses on the exit price, i.e., the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, not the entry price, i.e., the price that would be paid to acquire the asset or received to assume the liability at the measurement date. The statement emphasizes that fair value is a market-based measurement; not an entity-specific measurement. Therefore, the fair value measurement should be determined based on the assumptions that market participants would use in pricing the asset or liability. Valuation Hierarchy FASB ASC 820 establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The three levels are defined as follows: • Level 1 – inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument. • Level 3 – inputs to the valuation methodology are unobservable and significant to the fair value measurement. A financial instrument's categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Following is a description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of such assets and liabilities pursuant to the valuation hierarchy. Assets Securities available-for-sale – Where quoted prices are available for identical securities in an active market, securities are classified within Level 1 of the valuation hierarchy. Level 1 securities include highly liquid government securities and certain other financial products. If quoted market prices are not available, then fair values are estimated by using pricing models that use observable inputs or quoted prices of securities with similar characteristics and are classified within Level 2 of the valuation hierarchy. In certain cases where there is limited activity or less transparency around inputs to the valuation and more complex pricing models or discounted cash flows are used, securities are classified within Level 3 of the valuation hierarchy. Other investments – Included in other assets are other investments recorded at fair value primarily in certain nonpublic entities and funds. The valuation of these nonpublic investments requires management judgment due to the absence of observable quoted market prices, inherent lack of liquidity and the long-term nature of such assets. These investments are valued initially based upon transaction price. The carrying values of other investments are adjusted either upwards or downwards from the transaction price to reflect expected exit values as evidenced by financing and sale transactions with third parties, or when determination of a valuation adjustment is confirmed through ongoing reviews by senior investment managers. A variety of factors are reviewed and monitored to assess positive and negative changes in valuation including, but not limited to, current operating performance and future expectations of the particular investment, industry valuations of comparable public companies and changes in market outlook and the third-party financing environment over time. In determining valuation adjustments resulting from the investment review process, emphasis is placed on current company performance and market conditions. These investments are included in Level 3 of the valuation hierarchy as these entities and funds are not widely traded and the underlying investments are often privately-held and/or start-up companies for which market values are not readily available. Other assets – Included in other assets are certain assets carried at fair value, including interest rate swap agreements, the cash flow hedge and interest rate locks associated with the mortgage loan pipeline. The carrying amount of interest rate swap agreements is based on Pinnacle Financial's pricing models that utilize observable market inputs. The fair value of the cash flow hedge is determined by calculating the difference between the discounted fixed rate cash flows and the discounted variable rate cash flows. The fair value of the mortgage loan pipeline is based upon the projected sales price of the underlying loans, taking into account market interest rates and other market factors at the measurement date, net of the projected fallout rate. Pinnacle Financial reflects these assets within Level 2 of the valuation hierarchy as these assets are valued using similar transactions that occur in the market. Nonaccrual loans – A loan is classified as nonaccrual when it is probable Pinnacle Financial will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan agreement. Nonaccrual loans are measured based on the present value of expected payments using the loan's original effective rate as the discount rate, the loan's observable market price, or the fair value of the collateral less selling costs if the loan is collateral dependent. If the recorded investment in the nonaccrual loan exceeds the measure of fair value, a valuation allowance may be established as a component of the allowance for loan losses or the difference may be recognized as a charge-off. Nonaccrual loans are classified within Level 3 of the hierarchy due to the unobservable inputs used in determining their fair value such as collateral values and the borrower's underlying financial condition. Other real estate owned – Other real estate owned (OREO) represents real estate foreclosed upon by Pinnacle Bank through loan defaults by customers or acquired by deed in lieu of foreclosure. Substantially all of these amounts relate to lots, homes and development projects that are either completed or are in various stages of construction for which Pinnacle Financial believes it has adequate collateral. Upon foreclosure, the property is recorded at the lower of cost or fair value, based on appraised value, less selling costs estimated as of the date acquired with any loss recognized as a charge-off through the allowance for loan losses. Additional OREO losses for subsequent valuation downward adjustments are determined on a specific property basis and are included as a component of noninterest expense along with holding costs. Any gains or losses realized at the time of disposal are also reflected in noninterest expense, as applicable. OREO is included in Level 3 of the valuation hierarchy due to the lack of observable market inputs into the determination of fair value. Appraisal values are property-specific and sensitive to the changes in the overall economic environment. Liabilities Other liabilities – Pinnacle Financial has certain liabilities carried at fair value including certain interest rate swap agreements. The fair value of these liabilities is based on Pinnacle Financial's pricing models that utilize observable market inputs and is reflected within Level 2 of the valuation hierarchy. The following tables present the financial instruments carried at fair value on a recurring basis as of December 31, 2017 and 2016 , by caption on the consolidated balance sheets and by FASB ASC 820 valuation hierarchy (as described above) (in thousands): December 31, 2017 Total carrying value in the consolidated balance sheet Quoted market prices in an active market (Level 1) Models with significant observable market parameters (Level 2) Models with significant unobservable market parameters (Level 3) Investment securities available-for-sale: U.S. treasury securities $ 30,445 $ — $ 30,445 $ — U.S. government agency securities 180,801 — 180,801 — Mortgage-backed securities 1,263,819 — 1,263,819 — State and municipal securities 784,612 — 767,583 17,029 Asset- backed securities 173,292 — 173,292 — Corporate notes and other 82,314 — 82,314 — Total investment securities available-for-sale 2,515,283 — 2,498,254 17,029 Other investments 28,874 — — 28,874 Other assets 11,812 — 11,812 — Total assets at fair value $ 2,555,969 $ — $ 2,510,066 $ 45,903 Other liabilities $ 13,886 $ — $ 13,886 $ — Total liabilities at fair value $ 13,886 $ — $ 13,886 $ — December 31, 2016 Investment securities available-for-sale: U.S. treasury securities $ 250 $ — $ 250 $ — U.S. government agency securities $ 21,769 $ — $ 21,769 $ — Mortgage-backed securities 976,626 — 976,626 — State and municipal securities 212,720 — 212,720 — Asset- backed securities 78,580 — 78,580 — Corporate notes and other 8,601 — 8,601 — Total investment securities available-for-sale 1,298,546 — 1,298,546 — Other investments 10,478 — — 10,478 Other assets 13,340 — 13,340 — Total assets at fair value $ 1,322,364 $ — $ 1,311,886 $ 10,478 Other liabilities $ 15,758 $ — $ 15,758 $ — Total liabilities at fair value $ 15,758 $ — $ 15,758 $ — The following table presents assets measured at fair value on a nonrecurring basis as of December 31, 2017 and 2016 (in thousands): December 31, 2017 Total carrying value in the consolidated balance sheet Quoted market prices in an active market (Level 1) Models with significant observable market parameters (Level 2) Models with significant unobservable market parameters (Level 3) Total gains (losses) for the period ended Other real estate owned $ 27,831 $ — $ — $ 27,831 $ 203 Nonaccrual loans, net (1) 55,138 — — 55,138 (722 ) Total $ 82,969 $ — $ — $ 82,969 $ (519 ) December 31, 2016 Other real estate owned $ 6,090 $ — $ — $ 6,090 $ (135 ) Nonaccrual loans, net (1) 26,506 — — 26,506 (7,173 ) Total $ 32,596 $ — $ — $ 32,596 $ (7,308 ) (1) Amount is net of a valuation allowance of $2.3 million and $1.1 million at December 31, 2017 and 2016 , respectively, as required by ASC 310-10, "Receivables." In the case of investment securities, Pinnacle Financial monitors the valuation technique utilized by various pricing agencies to ascertain when transfers between levels have been affected. The nature of the remaining assets and liabilities is such that transfers in and out of any level are expected to be rare. For the year ended December 31, 2017 , there were no transfers between Levels 1, 2 or 3. The table below includes a rollforward of the balance sheet amounts for the year ended December 31, 2017 for financial instruments classified by Pinnacle Financial within Level 3 of the valuation hierarchy measured at fair value on a recurring basis including changes in fair value due in part to observable factors that are part of the valuation methodology (in thousands): For the year ended December 31, 2017 2016 Available-for-sale Securities Other assets Other liabilities Available-for-sale Securities Other assets Other liabilities Fair value, Jan. 1 $ — $ 10,478 $ — $ — $ 9,764 $ — Total net realized losses included in income 66 605 — — 131 — Change in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at Dec. 31 709 — — — — — Acquired 16,254 17,062 — — — — Purchases — 2,330 — — 1,639 — Issuances — — — — — — Settlements — (1,601 ) — — (1,056 ) — Transfers out of Level 3 — — — — — — Fair value, Dec. 31 $ 17,029 $ 28,874 $ — $ — $ 10,478 $ — Total realized losses included in income related to financial assets and liabilities still on the consolidated balance sheet at Dec. 31 $ 66 $ 605 $ — $ — $ 131 $ — The following methods and assumptions were used by Pinnacle Financial in estimating its fair value disclosures for financial instruments that are not measured at fair value. In cases where quoted market prices are not available, fair values are based on estimates using discounted cash flow models. Those models are significantly affected by the assumptions used, including the discount rates, estimates of future cash flows and borrower creditworthiness. The fair value estimates presented herein are based on pertinent information available to management as of December 31, 2017 and 2016 , respectively. Such amounts have not been revalued for purposes of these consolidated financial statements since those dates and, therefore, current estimates of fair value may differ significantly from the amounts presented herein. Held-to-maturity securities - Estimated fair values for investment securities are based on quoted market prices where available. If quoted market prices are not available, then fair values are estimated by using pricing models that use observable inputs or quoted prices of securities with similar characteristics. Loans - The fair value of Pinnacle Financial's loan portfolio includes a credit risk factor in the determination of the fair value of its loans. This credit risk assumption is intended to approximate the fair value that a market participant would realize in a hypothetical orderly transaction. Pinnacle Financial's loan portfolio is initially fair valued using a segmented approach. Pinnacle Financial divides its loan portfolio into the following categories: variable rate loans, impaired loans and all other loans. The results are then adjusted to account for credit risk. Fair values for impaired loans are estimated using discounted cash flow models or based on the fair value of the underlying collateral. For other loans, fair values are estimated using discounted cash flow models, using current market interest rates offered for loans with similar terms to borrowers of similar credit quality. The values derived from the discounted cash flow approach for each of the above portfolios are then further discounted to incorporate credit risk to determine the exit price. Mortgage loans held-for-sale - Mortgage loans held-for-sale are carried at the lower of cost or fair value. The estimate of fair value is based on pricing models and other information. Deposits, Securities sold under agreements to repurchase, Federal Home Loan Bank (FHLB) advances, Subordinated debt and other borrowings - The carrying amounts of demand deposits, savings deposits, securities sold under agreements to repurchase, floating rate advances from the Federal Home Loan Bank, and floating rate subordinated debt and other borrowings approximate their fair values. Fair values for certificates of deposit, fixed rate advances from the FHLB and fixed rate subordinated debt are estimated using discounted cash flow models, using current market interest rates offered on certificates, advances and other borrowings with similar remaining maturities. For fixed rate subordinated debt, the maturity is assumed to be as of the earliest date that the indebtedness will be repriced. Off-Balance Sheet Instruments - The fair values of Pinnacle Financial's off-balance-sheet financial instruments are based on fees charged to enter into similar agreements. However, commitments to extend credit do not represent a significant value to Pinnacle Financial until such commitments are funded. The following table presents the carrying amounts, estimated fair value and placement in the fair value hierarchy of Pinnacle Financial's financial instruments at December 31, 2017 and 2016 . This table excludes financial instruments for which the carrying amount approximates fair value. For short-term financial assets such as cash and cash equivalents, the carrying amount is a reasonable estimate of fair value due to the relatively short time between the origination of the instrument and its expected realization. For financial liabilities such as non-interest bearing demand, interest-bearing demand, and savings deposits, the carrying amount is a reasonable estimate of fair value due to these products having no stated maturity. December 31, 2017 Carrying/ Notional Amount Estimated Fair Value (1) Quoted market prices in an active market (Level 1) Models with significant observable market parameters (Level 2) Models with significant unobservable market parameters (Level 3) Financial assets: Securities held-to-maturity $ 20,762 $ 20,830 $ — $ 20,830 $ — Loans, net 15,565,876 15,252,953 — — 15,252,953 Mortgage loans held-for-sale 103,729 104,986 — 104,986 — Commercial loans held-for-sale 25,456 25,761 — 25,761 — Financial liabilities: Deposits and securities sold under agreements to repurchase 16,586,964 16,516,342 — — 16,516,342 Federal Home Loan Bank advances 1,319,909 1,313,311 — — 1,313,311 Subordinated debt and other borrowings 465,505 445,098 — — 445,098 Off-balance sheet instruments: Commitments to extend credit (2) 5,788,425 2,264 — — 2,264 Standby letters of credit (3) 143,684 800 — — 800 December 31, 2017 Carrying/ Notional Amount Estimated Fair Value (1) Quoted market prices in an active market (Level 1) Models with significant observable market parameters (Level 2) Models with significant unobservable market parameters (Level 3) December 31, 2016 Financial assets: Securities held-to-maturity $ 25,251 $ 25,233 $ — $ 25,233 $ — Loans, net 8,390,944 8,178,982 — — 8,178,982 Mortgage loans held-for-sale 47,710 47,892 — 47,892 — Commercial loans held-for-sale 22,588 22,674 — 22,674 — Financial liabilities: Deposits and securities sold under agreements to repurchase 8,845,014 8,579,664 — — 8,579,664 Federal Home Loan Bank advances 406,304 406,491 — — 406,491 Subordinated debt and other borrowings 350,768 328,049 — — 328,049 Off-balance sheet instruments: Commitments to extend credit (2) 3,374,269 383 — — 383 Standby letters of credit (3) 131,418 740 — — 740 (1) Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction. (2) At the end of each period, Pinnacle Financial evaluates the inherent risks of the outstanding off-balance sheet commitments. In making this evaluation, Pinnacle Financial evaluates the credit worthiness of the borrower, the collateral supporting the commitments and any other factors similar to those used to evaluate the inherent risks of our loan portfolio. Additionally, Pinnacle Financial evaluates the probability that the outstanding commitment will eventually become a funded loan. As a result, at both December 31, 2017 and 2016 , respectively, Pinnacle Financial included in other liabilities $2.3 million and $383,000 representing the inherent risks associated with these off-balance sheet commitments. (3) At December 31, 2017 and 2016 , the fair value of Pinnacle Financial's standby letters of credit totaled $800,000 and $740,000 , respectively. This amount represents the unamortized fee associated with these standby letters of credit, which were priced at market when issued, and is included in the consolidated balance sheet of Pinnacle Financial and is believed to approximate fair value. This fair value will decrease over time as the existing standby letters of credit approach their expiration dates.

Variable Interest Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2016
Variable Interest Entities [Abstract]
Variable Interest Entities	Note 20. Variable Interest Entities Under ASC 810, Pinnacle Financial is deemed to be the primary beneficiary and required to consolidate a variable interest entity (VIE) if it has a variable interest in the VIE that provides it with a controlling financial interest. For such purposes, the determination of whether a controlling financial interest exists is based on whether a single party has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. ASC 810 requires continual reconsideration of conclusions reached regarding which interest holder is a VIE's primary beneficiary and disclosures surrounding those VIE's which have not been consolidated. The consolidation methodology provided in this footnote as of December 31, 2017 and 2016 has been prepared in accordance with ASC 810. Non-consolidated Variable Interest Entities At December 31, 2017 , Pinnacle Financial did not have any consolidated VIEs to disclose but did have the following non-consolidated VIEs: low income housing partnerships, trust preferred issuances, troubled debt restructuring commercial loans, and managed discretionary trusts. Since 2003, Pinnacle Financial has made equity investments as a limited partner in various partnerships that sponsor affordable housing projects. The purpose of these investments is to achieve a satisfactory return on capital and to support Pinnacle Financial's community reinvestment initiatives. The activities of the limited partnerships include the identification, development, and operation of multi-family housing that is leased to qualifying residential tenants generally within Pinnacle Financial's primary geographic region. These partnerships are considered VIEs because Pinnacle Financial, as the holder of the equity investment at risk, does not have the ability to direct the activities that most significantly affect the success of the entity through voting rights or similar rights. While Pinnacle Financial could absorb losses that are significant to these partnerships as it has a risk of loss for its initial capital contributions and funding commitments to each partnership, it is not considered the primary beneficiary of the partnerships as the general partners whose managerial functions give them the power to direct the activities that most significantly impact the partnerships' economic performance and who are exposed to all losses beyond Pinnacle Financial's initial capital contributions and funding commitments are considered the primary beneficiaries. Pinnacle Financial (or companies it has acquired) has previously issued subordinated debt totaling $133.0 million to certain statutory trusts which are considered VIEs because Pinnacle Financial's capital contributions to these trusts are not considered "at risk" in evaluating whether the holders of the equity investments at risk in the trusts have the power through voting rights or similar rights to direct the activities that most significantly impact the entities' economic performance. These trusts were not consolidated by Pinnacle Financial because the holders of the securities issued by the trusts absorb a majority of expected losses and residual returns. For certain troubled commercial loans, Pinnacle Financial restructures the terms of the borrower's debt in an effort to increase the probability of receipt of amounts contractually due. However, Pinnacle Financial does not assume decision-making power or responsibility over the borrower's operations. Following a debt restructuring, the borrowing entity typically meets the definition of a VIE as the initial determination of whether the entity is a VIE must be reconsidered and economic events have proven that the entity's equity is not sufficient to permit it to finance its activities without additional subordinated financial support or a restructuring of the terms of its financing. As Pinnacle Financial does not have the power to direct the activities that most significantly impact such troubled commercial borrowers' operations, it is not considered the primary beneficiary even in situations where, based on the size of the financing provided, Pinnacle Financial is exposed to potentially significant benefits and losses of the borrowing entity. Pinnacle Financial has no contractual requirements to provide financial support to the borrowing entities beyond certain funding commitments established upon restructuring of the terms of the debt to allow for completion of activities which prepare the collateral related to the debt for sale. Pinnacle Financial serves as manager over certain discretionary trusts, for which it makes investment decisions on behalf of the trusts' beneficiaries in return for a management fee. The trusts meet the definition of a VIE since the holders of the equity investments at risk do not have the power through voting rights or similar rights to direct the activities that most significantly impact the entities' economic performance. However, since the management fees Pinnacle Financial receives are not considered variable interests in the trusts as all of the requirements related to permitted levels of decision maker fees are met, such VIEs are not consolidated by Pinnacle Financial because it cannot be the trusts' primary beneficiary. Pinnacle Financial has no contractual requirements to provide financial support to the trusts. The following table summarizes VIE's that are not consolidated by Pinnacle Financial as of December 31, 2017 and 2016 (in thousands): December 31, 2017 December 31, 2016 Type Maximum Loss Exposure Liability Recognized Maximum Loss Exposure Liability Recognized Classification Low Income Housing Partnerships $ 23,912 $ — $ 24,150 $ — Other Assets Trust Preferred Issuances N/A 132,995 N/A 82,476 Subordinated Debt Commercial Troubled Debt Restructurings 3,760 — 11,572 — Loans Managed Discretionary Trusts N/A N/A N/A N/A N/A

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2017
Regulatory Capital Requirements [Abstract]
Regulatory Matters	Note 21. Regulatory Matters Pursuant to Tennessee banking law, Pinnacle Bank may not, without the prior consent of the Commissioner of the TDFI, pay any dividends to Pinnacle Financial in a calendar year in excess of the total of Pinnacle Bank's retained net income for that year plus the retained net income for the preceding two years. During the year ended December 31, 2017 , Pinnacle Bank paid $63.1 million in dividends to Pinnacle Financial. As of December 31, 2017 , Pinnacle Bank could pay approximately $305.1 million of additional dividends to Pinnacle Financial without prior approval of the Commissioner of the TDFI. Pinnacle Financial initiated payment of a quarterly dividend of $0.08 per share of common stock in the fourth quarter of 2013 and has since increased the dividend to $0.12 beginning in the first quarter of 2015 and to $0.14 beginning in the first quarter of 2016. The amount and timing of all future dividend payments, if any, is subject to the discretion of Pinnacle Financial's board of directors and will depend on Pinnacle Financial's earnings, capital position, financial condition and other factors, including new regulatory capital requirements, as they become known to us. Pinnacle Financial and Pinnacle Bank are subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary actions, by regulators that, if undertaken, could have a direct material effect on the financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, Pinnacle Financial and Pinnacle Bank must meet specific capital guidelines that involve quantitative measures of the assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. Pinnacle Financial's and Pinnacle Bank's capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require Pinnacle Financial and its banking subsidiary to maintain minimum amounts and ratios of common equity Tier 1 capital to risk-weighted assets, Tier I capital to risk-weighted assets, total risk-based capital to risk-weighted assets and of Tier 1 capital to average assets. The final rules implementing the Basel Committee on Banking Supervision's capital guidelines for U.S. banks (Basel III rules) became effective for Pinnacle Financial on January 1, 2015 with full compliance with all of the requirements being phased in over a multi-year schedule, and fully phased in by January 1, 2019. The minimum capital level requirements applicable to bank holding companies and banks subject to the rules are: (i) a common equity Tier 1 capital ratio of 4.5% ; (ii) a Tier 1 risk-based capital ratio of 6% ; (iii) a total risk-based capital ratio of 8% ; and (iv) a Tier 1 leverage ratio of 4% for all institutions. The Basel III rules, also establish a capital conservation buffer of 2.5% (to be phased in over three years) above the regulatory minimum risk-based capital ratios. The phase-in of the capital conservation buffer requirement commenced in January 2016 at 0.625% of risk-weighted assets and increases each year by a like percentage until fully implemented in January 2019. The net unrealized gain or loss on available-for-sale securities is not included in computing regulatory capital. Management believes, as of December 31, 2017 , that Pinnacle Financial and Pinnacle Bank met all capital adequacy requirements to which they are subject. To be categorized as well-capitalized under applicable banking regulations, Pinnacle Financial and Pinnacle Bank must maintain certain total risk-based, Tier 1 risk-based, common equity Tier 1 and Tier 1 leverage ratios as set forth in the following table and not be subject to a written agreement, order or directive to maintain a higher capital level. The capital conservation buffer is not included in the required ratios of the table presented below. Pinnacle Financial's and Pinnacle Bank's actual capital amounts and ratios are presented in the following table (in thousands): Actual Minimum Capital Requirement Minimum To Be Well-Capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2017 Total capital to risk weighted assets: Pinnacle Financial $ 2,266,161 12.0 % $ 1,509,496 8.0 % N/A N/A Pinnacle Bank $ 2,134,344 11.3 % $ 1,504,765 8.0 % $ 1,880,956 10.0 % Tier 1 capital to risk weighted assets: Pinnacle Financial $ 1,725,323 9.1 % $ 1,132,122 6.0 % N/A N/A Pinnacle Bank $ 1,936,313 10.3 % $ 1,128,574 6.0 % $ 1,504,765 8.0 % Common equity Tier 1 capital: Pinnacle Financial $ 1,725,219 9.1 % $ 849,092 4.5 % N/A N/A Pinnacle Bank $ 1,936,209 10.3 % $ 846,430 4.5 % $ 1,222,621 6.5 % Tier 1 capital to average assets (*): Pinnacle Financial $ 1,725,323 8.6 % $ 797,861 4.0 % N/A N/A Pinnacle Bank $ 1,936,313 9.7 % $ 796,235 4.0 % $ 995,294 5.0 % December 31, 2016 Total capital to risk weighted assets: Pinnacle Financial $ 1,211,105 11.9 % $ 816,857 8.0 % N/A N/A Pinnacle Bank $ 1,136,782 11.2 % $ 814,254 8.0 % $ 1,017,817 10.0 % Tier 1 capital to risk weighted assets: Pinnacle Financial $ 882,654 8.6 % $ 612,643 6.0 % N/A N/A Pinnacle Bank $ 949,193 9.3 % $ 610,690 6.0 % $ 814,254 8.0 % Common equity Tier 1 capital: Pinnacle Financial $ 802,532 7.9 % $ 459,482 4.5 % N/A N/A Pinnacle Bank $ 949,070 9.3 % $ 458,018 4.5 % $ 661,581 6.5 % Tier 1 capital to average assets (*): Pinnacle Financial $ 882,654 8.6 % $ 412,902 4.0 % N/A N/A Pinnacle Bank $ 949,193 9.2 % $ 412,124 4.0 % $ 515,155 5.0 % (*) Average assets for the above calculations were based on the most recent quarter. Following the Merger with BNC, Pinnacle Financial's total assets exceeded $15.0 billion as a result of the acquisition of BNC, which caused the subordinated debentures Pinnacle Financial and BNC previously issued in connection with the trust preferred securities of their affiliates to cease to qualify as Tier 1 capital under applicable banking regulations. Though these securities no longer qualify as Tier 1 capital, Pinnacle Financial believes these subordinated debentures continue to qualify as Tier 2 capital.

Parent Company Only Financial I

Parent Company Only Financial Information	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Only Financial Information	Note 22. Parent Company Only Financial Information The following information presents the condensed balance sheets, statements of operations, and cash flows of Pinnacle Financial as of December 31, 2017 and 2016 and for each of the years in the three-year period ended December 31, 2017 (in thousands): CONDENSED BALANCE SHEETS 2017 2016 Assets: Cash and cash equivalents $ 64,851 $ 36,984 Investments in bank 3,855,483 1,579,728 Investments in consolidated subsidiaries 6,025 5,484 Investment in unconsolidated subsidiaries: Statutory Trusts 3,995 2,476 Other investments 69,256 61,374 Current income tax receivable 20,017 6,831 Other assets 29,524 29,182 $ 4,049,151 $ 1,722,059 Liabilities and stockholders' equity: Income taxes payable to subsidiaries 24 — Subordinated debt and other borrowings 337,818 223,337 Other liabilities 3,357 2,026 Stockholders' equity 3,707,952 1,496,696 $ 4,049,151 $ 1,722,059 CONDENSED STATEMENTS OF OPERATIONS 2017 2016 2015 Revenues: Income from bank subsidiaries $ 63,100 27,663 19,038 Income from nonbank subsidiaries 297 5,198 210 Income from equity method investment 10,126 7,663 — Other income (loss) 380 21 (132 ) Expenses: Interest expense 9,856 1,997 220 Personnel expense, including stock compensation 16,629 10,971 7,342 Other expense 8,076 3,653 2,889 Income before income taxes and equity in undistributed income of subsidiaries 39,342 23,924 8,665 Income tax benefit (12,748 ) (3,428 ) (4,119 ) Income before equity in undistributed income of subsidiaries 52,090 27,352 12,784 Equity in undistributed income of bank subsidiaries 121,341 104,318 81,536 Equity in undistributed income (loss) of nonbank subsidiaries 548 (4,445 ) 1,189 Net income $ 173,979 $ 127,225 $ 95,509 CONDENSED STATEMENTS OF CASH FLOWS 2017 2016 2015 Operating activities : Net income $ 173,979 $ 127,225 $ 95,509 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Amortization and accretion 290 543 — Stock-based compensation expense 19,538 10,971 7,342 Increase in income tax payable, net 24 (12 ) (10,870 ) Deferred tax expense 5,919 1,025 (394 ) Income from equity method investments, net (10,368 ) (8,350 ) — Excess tax benefit from stock compensation (5,365 ) (4,604 ) (4,116 ) Loss (gain) on other investments (350 ) 497 132 Decrease in other assets (3,989 ) 2,636 1,194 Increase in other liabilities (9,194 ) 3,157 3,771 Equity in undistributed income of bank subsidiaries (121,341 ) (104,318 ) (81,530 ) Equity in undistributed income of nonbank subsidiaries (548 ) 4,445 (1,189 ) Net cash provided by operating activities 48,595 33,215 9,849 Investing activities : Investment in consolidated banking subsidiaries (182,288 ) (118,878 ) — Increase in equity method investment — (11,400 ) — Dividends received from equity method investment 5,655 3,255 — Increase in other investments (815 ) (710 ) (335 ) Net cash used in investing activities (177,448 ) (127,733 ) (335 ) Financing activities : Net (decrease) increase in subordinated debt and other borrowings (60 ) 118,294 (13,682 ) Proceeds from common stock issuance 192,194 — — Exercise of common stock options and stock appreciation rights, net of repurchase of restricted shares 493 11,589 3,603 Excess tax benefit from stock compensation — 4,604 4,116 Common dividends paid (35,907 ) (24,725 ) (18,307 ) Net cash provided by (used in) financing activities 156,720 109,762 (24,270 ) Net increase (decrease) in cash 27,867 15,244 (14,756 ) Cash and cash equivalents, beginning of year 36,984 21,740 36,496 Cash and cash equivalents, end of year $ 64,851 $ 36,984 $ 21,740 Pinnacle Bank is subject to restrictions on the payment of dividends to Pinnacle Financial under Tennessee banking laws. Pinnacle Bank paid dividends of $63.1 million , $27.7 million and $19.0 million , respectively to Pinnacle Financial in each of the years ended December 31, 2017 , 2016 and 2015 .

Quarterly Financial Results (un

Quarterly Financial Results (unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Results (unaudited)	Note 23. Quarterly Financial Results (unaudited) A summary of selected consolidated quarterly financial data for each of the years in the three-year period ended December 31, 2017 follows: (in thousands, except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Interest income $ 102,143 $ 123,743 $ 202,167 $ 208,085 Net interest income 88,767 106,627 173,182 174,731 Provision for loan losses 3,651 6,812 6,920 6,281 Net income before taxes 53,444 63,074 99,503 81,965 Net income 39,653 43,086 64,442 26,798 Basic net income per share $ 0.83 $ 0.81 $ 0.84 $ 0.35 Diluted net income per share $ 0.82 $ 0.80 $ 0.83 $ 0.35 2016 Interest income $ 80,974 $ 83,762 $ 97,380 $ 101,493 Net interest income 73,902 75,044 86,635 89,413 Provision for loan losses 3,894 5,280 6,108 3,046 Net income before taxes 41,800 46,546 48,693 54,345 Net income 27,964 30,787 32,377 36,097 Basic net income per share $ 0.70 $ 0.75 $ 0.71 $ 0.79 Diluted net income per share $ 0.68 $ 0.73 $ 0.71 $ 0.78 2015 Interest income $ 54,679 $ 55,503 $ 67,192 $ 77,797 Net interest income 51,269 51,831 62,059 71,475 Provision for loan losses 315 1,186 2,228 5,459 Net income before taxes 32,617 33,917 36,134 40,432 Net income 21,843 22,665 24,149 26,854 Basic net income per share $ 0.62 $ 0.65 $ 0.64 $ 0.67 Diluted net income per share $ 0.62 $ 0.64 $ 0.62 $ 0.65

Summary of Significant Accoun30

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation — These consolidated financial statements include the accounts of Pinnacle Financial and its wholly-owned subsidiaries. Certain statutory trust affiliates of Pinnacle Financial, as noted in Note 11. Other Borrowings are included in these consolidated financial statements pursuant to the equity method of accounting. Significant intercompany transactions and accounts are eliminated in consolidation.
Use of Estimates	Use of Estimates — The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the balance sheet dates and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term include the determination of the allowance for loan losses, determination of any impairment of intangible assets and the valuation of deferred tax assets.
Impairment	Impairment — Long-lived assets, including purchased intangible assets subject to amortization, such as core deposit intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of would be separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. Pinnacle Financial had $56.7 million and $15.1 million of long-lived amortizing intangibles at December 31, 2017 and 2016 , respectively. Goodwill is evaluated for impairment at least annually and more frequently if events and circumstances indicate that the asset might be impaired. The Accounting Standards Codification (ASC) 350, Goodwill and Other , regarding testing goodwill for impairment provides an entity the option to first perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an entity does a qualitative assessment and determines that this is the case, or if a qualitative assessment is not performed, it is required to perform additional goodwill impairment testing to identify potential goodwill impairment and measure the amount of goodwill impairment loss to be recognized for that reporting unit (if any). Based on a qualitative assessment, if an entity determines that the fair value of a reporting unit is more than its carrying amount, the two-step goodwill impairment test is not required. Pinnacle Financial performed its annual assessment as of September 30, 2017. The results of the qualitative assessment indicated that the fair value of Pinnacle Financial's sole reporting unit was more than its carrying value, and accordingly, the two-step goodwill impairment test was not performed. Should Pinnacle Financial's common stock price decline or other impairment indicators become known, additional impairment testing of goodwill may be required. Should it be determined in a future period that the goodwill has become impaired, then a charge to earnings will be recorded in the period such determination is made. The following table presents activity for goodwill and other intangible assets (in thousands): Goodwill Core deposit and other intangible assets Total Balance at December 31, 2016 $ 551,594 $ 15,104 $ 566,698 Acquisitions 1,256,455 50,422 1,306,877 Amortization — (8,816 ) (8,816 ) Change in purchase price allocation of previous acquisitions — — — Other changes (1) (47 ) — (47 ) Balance at December 31, 2017 $ 1,808,002 $ 56,710 $ 1,864,712 (1) Represents options exercised related to acquisitions which occurred prior to the adoption of ASC 718-20 Compensation . The following table presents the gross carrying amount and accumulated amortization for the core deposit and other intangible assets, which are subject to amortization (in thousands): December 31, 2017 December 31, 2016 Gross carrying amount $ 92,787 $ 42,365 Accumulated amortization (36,077 ) (27,261 ) Net book value $ 56,710 $ 15,104
Cash Equivalents and Cash Flows	Cash Equivalents and Cash Flows — Cash on hand, cash items in process of collection, amounts due from banks, Federal funds sold, short-term discount notes and securities purchased under agreements to resell, with original maturities within ninety days, are included in cash and cash equivalents. The following supplemental cash flow information addresses certain cash payments and noncash transactions for each of the years in the three-year period ended December 31, 2017 as follows: For the years ended December 31, 2017 2016 2015 Cash Payments: Interest $ 91,628,041 $ 37,002,870 $ 17,435,292 Income taxes paid 81,538,510 49,503,637 45,715,968 Noncash Transactions: Loans charged-off to the allowance for loan losses 22,046,511 31,112,118 21,148,034 Loans foreclosed upon with repossessions transferred to other real estate 6,227,509 4,453,060 341,342 Loans foreclosed upon with repossessions transferred to other repossessed assets 645,737 1,842,318 8,259,368 Other real estate sales financed 907,931 — — Common stock issued in connection with acquisitions 1,850,968,026 222,162,640 269,492,990
Securities	Securities — Securities are classified based on management's intention on the date of purchase. All debt securities classified as available-for-sale are recorded at fair value with any unrealized gains and losses reported in accumulated other comprehensive income (loss), net of the deferred income tax effects. Securities that Pinnacle Financial has both the positive intent and ability to hold to maturity are classified as held-to-maturity and are carried at historical cost and adjusted for amortization of premiums and accretion of discounts. Interest and dividends on securities, including amortization of premiums and accretion of discounts calculated under the effective interest method, are included in interest income. For certain securities, amortization of premiums and accretion of discounts is computed based on the anticipated life of the security which may be shorter than the stated life of the security. Realized gains and losses from the sale of securities are determined using the specific identification method, and are recorded on the trade date of the sale.
Other-than-temporary Impairment	Other-than-temporary Impairment — A decline in the fair value of any available-for-sale or held-to-maturity security below cost that is deemed to be other-than-temporary results in a reduction in the carrying amount of the security. To determine whether impairment is other-than-temporary, management considers whether the entity expects to recover the entire amortized cost basis of the security by reviewing the present value of the future cash flows associated with the security. The shortfall of the present value of the cash flows expected to be collected in relation to the amortized cost basis is referred to as a credit loss and is deemed to be other-than-temporary impairment. If a credit loss is identified, the credit loss is recognized as a charge to earnings and a new cost basis for the security is established. If management concludes that a decline in fair value of a security is temporary and, a full recovery of principal and interest is expected and it is not more-likely-than-not that it will be required to sell the security before recovery of its amortized cost basis, then the security is not other-than-temporarily impaired and the shortfall is recorded as a component of equity. Periodically, available-for-sale securities may be sold or the composition of the portfolio realigned to improve yields, quality or marketability, or to implement changes in investment or asset/liability strategy, including maintaining collateral requirements and raising funds for liquidity purposes. Additionally, if an available-for-sale security loses its investment grade, tax-exempt status, the underlying credit support is terminated or collection otherwise becomes uncertain based on factors known to management, Pinnacle Financial will consider selling the security, but will review each security on a case-by-case basis as these factors become known. Resultantly, other-than-temporary charges may be incurred as management's intention related to a particular security changes. The carrying values of Pinnacle Financial's investment securities could decline in the future if the financial condition of the securities' issuer deteriorates and management determines it is probable that Pinnacle Financial will not recover the entire amortized cost bases of the securities. As a result, there is a risk that other-than-temporary impairment charges may occur in the future. There is also a risk that other-than-temporary impairment charges may occur in the future if management's intention to hold these securities to maturity and or recovery changes.
Mortgage loans held-for-sale	Loans held-for-sale — Loans originated and intended for sale are carried at the lower of cost or estimated fair value as determined on a loan-by-loan basis. Net unrealized losses, if any, are recognized through a valuation allowance by charges to income. Realized gains and losses are recognized when legal title to the loans has been transferred to the purchaser and sales proceeds have been received and are reflected in the accompanying consolidated statement of income in gains on mortgage loans sold, net of related costs such as compensation expenses, for mortgage loans, and as a component of other noninterest income for commercial loans held-for-sale.
Loans	Loans — Pinnacle Financial has five loan segments for financial reporting purposes: commercial and industrial, commercial real estate mortgage, construction and land development, consumer and other and consumer real estate mortgage. The appropriate classification is determined based on the underlying collateral utilized to secure each loan. These classifications are consistent with those utilized in the Quarterly Report of Condition and Income filed by Pinnacle Bank with the Federal Deposit Insurance Corporation (FDIC). Loans are reported at their outstanding principal balances, net of the allowance for loan losses and any deferred fees or costs on originated loans. Interest income on loans is accrued based on the principal balance outstanding. Loan origination fees, net of certain loan origination costs, are deferred and recognized as an adjustment to the related loan yield using a method which approximates the interest method. At December 31, 2017 and 2016 , net deferred loan fees of $7.8 million and $7.6 million respectively, were included in loans on the accompanying consolidated balance sheets. As part of our routine credit monitoring process, commercial loans receive risk ratings by the assigned financial advisor and are subject to validation by our independent loan review department. Risk ratings are categorized as pass, special mention, substandard, substandard-nonaccrual or doubtful-nonaccrual. Pinnacle Financial believes that its categories follow those outlined by Pinnacle Bank's primary federal regulator. At December 31, 2017 , approximately 81.4% of Pinnacle Financial's loan portfolio was assigned a specifically assigned risk rating. Certain consumer loans and commercial relationships that possess certain qualifying characteristics, including individually smaller balances, are generally not assigned an individual risk rating but are evaluated collectively for credit risk as a homogeneous pool of loans and individually as either accrual or nonaccrual based on the performance of the loan. Loans are placed on nonaccrual status when there is a significant deterioration in the financial condition of the borrower, which generally is the case but is not limited to when the principal or interest is more than 90 days past due, unless the loan is both well-secured and in the process of collection. All interest accrued but not collected for loans that are placed on nonaccrual status is reversed against current interest income. Interest income is subsequently recognized only if certain cash payments are received while the loan is classified as nonaccrual, but interest income recognition is reviewed on a case-by-case basis to determine if the payment should be applied to interest or principal pursuant to regulatory guidelines. A nonaccrual loan is returned to accruing status once the loan has been brought current as to principal and interest and collection is reasonably assured or the loan has been well-secured through other techniques. All loans that are placed on nonaccrual status are further analyzed to determine if they should be classified as impaired loans. A loan is considered to be impaired when it is probable Pinnacle Financial will be unable to collect all principal and interest payments due in accordance with the contractual terms of the loan. This determination is made using a variety of techniques, which include a review of the borrower's financial condition, debt-service coverage ratios, global cash flow analysis, guarantor support, other loan file information, meetings with borrowers, inspection or reappraisal of collateral and/or consultation with legal counsel as well as results of reviews of other similar industry credits (e.g. builder loans, development loans, church loans, etc.). Loans are charged off when management believes that the full collectability of the loan is unlikely. As such, a loan may be partially charged-off after a "confirming event" has occurred which serves to validate that full repayment pursuant to the terms of the loan is unlikely.
Purchased Loans	Purchased Loans — Purchased loans, including loans acquired through a merger, are initially recorded at fair value on the date of purchase. Purchased loans that contain evidence of post-origination credit deterioration as of the purchase date are carried at the net present value of expected future cash flows. All other purchased loans are recorded at their initial fair value, and adjusted for subsequent advances, pay downs, amortization or accretion of any fair value premium or discount on purchase, charge-offs and any other adjustment to carrying value. Pursuant to U.S. generally accepted accounting principles (GAAP), management has up to 12 months following the date of the acquisition to finalize the fair values of acquired assets and assumed liabilities as of the acquisition date. Once management has finalized the fair values of acquired assets and assumed liabilities within this 12-month period, management considers such values to be the day 1 fair values (Day 1 Fair Values). At the time of acquisition, management evaluates all purchased loans using a variety of factors such as current classification or risk rating, past due status and history as a component of the fair value determination. For those purchased loans without evidence of credit deterioration, management evaluates each reviewed loan using an internal grading system with a grade assigned to each loan at the date of acquisition. To the extent that any purchased loan is not specifically reviewed, such loan is assumed to have characteristics similar to the characteristics of the specifically reviewed acquired portfolio of purchased loans. The grade for each purchased loan without evidence of credit deterioration is reviewed subsequent to the date of acquisition any time a loan is renewed or extended or at any time information becomes available to Pinnacle Financial that provides material insight regarding the loan's performance, the borrower's capacity to repay or the underlying collateral. In determining the Day 1 Fair Values of purchased loans without evidence of post-origination credit deterioration at the date of acquisition, management includes (i) no carry over of any previously recorded allowance for loan losses (ALL) and (ii) an adjustment of the unpaid principal balance to reflect an appropriate market rate of interest and expected loss, given the risk profile and grade assigned to each loan. This adjustment is accreted into earnings as a yield adjustment, using the effective yield method, over the remaining life of each loan. Purchased loans that contain evidence of credit deterioration on the date of purchase are individually evaluated by management to determine the estimated fair value of each loan. This evaluation includes no carryover of any previously recorded ALL. In determining the estimated fair value of purchased loans with evidence of credit deterioration, management considers a number of factors including, among other things, the remaining life of the acquired loans, estimated prepayments, estimated loss ratios, estimated value of the underlying collateral, estimated holding periods, and net present value of cash flows expected to be received. In determining the Day 1 Fair Values of purchased loans with evidence of credit deterioration, management calculates a non-accretable difference (the credit risk component of the purchased loans) and an accretable difference (the yield component of the purchased loans). The non-accretable difference is the difference between the contractually required payments and the cash flows expected to be collected in accordance with management's determination of the Day 1 Fair Values. Subsequent increases in expected cash flows will result in an adjustment to accretable yield, which will have a positive impact on interest income. Subsequent decreases in expected cash flows will generally result in increased provision for loan losses. Subsequent increases in expected cash flows following any previous decrease will result in a reversal of the provision for loan losses to the extent of prior charges and then an adjustment to accretable yield. The accretable difference on purchased loans with evidence of credit deterioration is the difference between the expected cash flows and the net present value of expected cash flows. Such difference is accreted into earnings using the effective yield method over the term of the loans. For purchased loans with evidence of credit deterioration for which the expected cash flows cannot be forecasted, these loans are deemed to be collateral dependent, are recorded at their fair value and are placed on nonaccrual, with interest payments recorded on a cash basis, as appropriate.
Allowance for Loan Losses	Allowance for Loan Losses (allowance) - Pinnacle Financial's management assesses the adequacy of the allowance prior to the end of each calendar quarter. This assessment includes procedures to estimate the allowance and test the adequacy and appropriateness of the resulting balance. The level of the allowance is based upon management's evaluation of the loan portfolio, loan loss experience, asset quality trends, known and inherent risks in the portfolio, adverse situations that may affect the borrowers' ability to repay the loan (including the timing of future payment), the estimated value of any underlying collateral, composition of the loan portfolio, economic conditions, industry and peer bank loan quality indications and other pertinent factors, including regulatory recommendations. The level of allowance maintained by management is believed adequate to absorb probable losses inherent in the loan portfolio at the balance sheet date. The allowance is increased by provisions charged to expense and decreased by charge-offs, net of recoveries of amounts previously charged-off. Allocation of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management's judgment, is deemed uncollectible. Pinnacle Financial's allowance for loan loss assessment methodology was modified during the year ended December 31, 2017 to (i) extend the lookback period from 24 quarters to a period beginning January 1, 2006 to better capture the risk associated with this extended economic cycle, (ii) eliminate the use of risk ratings in the calculation of the loss rate and instead focus on loss rate by loan type and (iii) expand the economic variables used in the qualitative assessment to incorporate our expanded footprint. Pinnacle Financial also eliminated the use of a loss emergence period in light of the minimal population of losses available to evaluate that were previously being extrapolated to the full population of loans, and shifted the focus of its analysis to more of a quantitative model. There was no material impact on the adoption of the changes in the allowance for loan loss assessment methodology. Pinnacle Financial's allowance for loan losses is composed of the result of two independent analyses pursuant to the provisions of ASC 450-20, Loss Contingencies and ASC 310-10-35, Receivables . The ASC 450-20 analysis is intended to quantify the inherent risks in its performing loan portfolio. The ASC 310-10-35 analysis includes a loan-by-loan analysis of impaired loans, including those reported as nonaccrual, troubled-debt restructurings and purchase credit impaired. In assessing the adequacy of the allowance, Pinnacle Financial also considers the results of Pinnacle Financial's ongoing independent loan review process. Pinnacle Financial undertakes this process both to ascertain those loans in the portfolio with elevated credit risk and to assist in its overall evaluation of the risk characteristics of the entire loan portfolio. Its loan review process includes the judgment of management, independent internal loan reviewers, and reviews that may have been conducted by third-party reviewers including regulatory examiners. Pinnacle Financial incorporates relevant loan review results in the allowance. The ASC 450-20 component of the allowance for loan losses begins with a historical loss rate calculation for each loan pool with similar risk characteristics. The losses realized over a rolling four-quarter cycle are utilized to determine an annual loss rate for each loan pool for each quarter-end in our look-back period. The look-back period in our loss rate calculation begins with January 2006, as we believe the period from January 1, 2006 to present is more representative of this economic cycle. The loss rates for each category are then averaged and applied to the end of period loan portfolio balances to determine estimated losses. The loss rates provide a quantitative estimate of credit losses inherent in our end of period loan portfolio based on our actual loss experience. The estimated loan loss allocation for all loan segments is then adjusted for management's estimate of probable losses for a number of qualitative factors that have not been considered in the quantitative analysis. The qualitative categories and the measurements used to quantify the risks within each of these categories are subjectively selected by management, but measured by objective measurements period over period. The data for each measurement may be obtained from internal or external sources. The current period measurements are evaluated and assigned a factor commensurate with the current level of risk relative to past measurements over time. The resulting factor is applied to the non-impaired loan portfolio. This amount represents estimated probable inherent credit losses which exist, but have not yet been identified either in its risk rating or impairment process, as of the balance sheet date, and is based upon quarterly trend assessments in portfolio concentrations, policy exceptions, economic conditions, associate retention, independent loan review results, collateral considerations, credit quality, competition, enterprise wide risk assessments, and peer group credit quality. The qualitative allowance allocation, as determined by the processes noted above, is increased or decreased for each loan segment based on the assessment of these various qualitative factors. The allowance for loan losses for purchased loans is calculated similar to that utilized for legacy Pinnacle Bank loans. Pinnacle Financial's accounting policy is to compare the computed allowance for loan losses for each purchased loan to the remaining fair value adjustment at the individual loan level. If the computed allowance at the loan level is greater than the remaining fair value adjustment, the excess is added to the allowance for loan losses by a charge to the provision for loan losses. The ASC 450-20 portion of the allowance includes a small unallocated component. Pinnacle Financial believes that the unallocated amount is warranted for inherent factors that cannot be practically assigned to individual loan categories, such as the imprecision in the overall loss allocation measurement process, the subjectivity risk of potentially not considering all relevant environmental categories and related measurements and imprecision in its credit risk ratings process. The appropriateness of the unallocated component of the allowance is assessed each quarter end based upon changes in the overall business environment not otherwise captured. The impaired loan allowance is determined pursuant to ASC 310-10-35. Loans are impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan agreement. Collection of all amounts due according to the contractual terms means collecting all interest and principal payments of a loan as scheduled in the loan agreement. This evaluation is inherently subjective as it requires material estimates including the amounts and timing of future cash flows expected to be received on impaired loans that may be susceptible to significant change. Loan losses are charged off when management believes that the full collectability of the loan is unlikely. A loan may be partially charged-off after a "confirming event" has occurred which serves to validate that full repayment pursuant to the terms of the loan is unlikely. An impairment allowance is recognized if the fair value of the loan is less than the recorded investment in the loan (recorded investment in the loan is the principal balance plus any accrued interest, net of deferred loan fees or costs and unamortized premium or discount). The impairment is recognized through the provision for loan losses and is a component of the allowance for loan losses. Loans that are impaired are recorded at the present value of expected future cash flows discounted at the loan's effective interest rate, or if the loan is collateral dependent, at the fair value of the collateral, less estimated disposal costs. If the loan is cash flow dependent, a specific reserve is established as a component of the allowance. If the loan is collateral dependent, the principal balance of the loan is charged-off in an amount equal to the impairment measurement. The fair value of collateral dependent loans is derived primarily from collateral appraisals performed by independent third-party appraisers. Management believes it follows appropriate accounting and regulatory guidance in determining impairment and accrual status of impaired loans. This analysis is completed for all individual loans greater than $500,000 . The resulting allowance percentage by segment adjusted for specific trends identified, if applicable, is then applied to the remaining population of impaired loans. Pursuant to the guidance set forth in ASU No. 2011-02, A Creditor's Determination of Whether a Restructuring is a Troubled Debt Restructuring , the above impairment methodology is also applied to those loans identified as troubled debt restructurings. Sufficiency of the computed allowance is then tested by comparison to historical trends and industry and peer information. Pinnacle Financial then evaluates the result of the procedures performed, including the results of its testing, and concludes on the appropriateness of the balance of the allowance in its entirety. The audit committee of Pinnacle Financial's board of directors reviews and approves the methodology and resultant allowance prior to the filing of quarterly and annual financial information. While its policies and procedures used to estimate the allowance for loan losses, as well as the resultant provision for loan losses charged to income, are considered adequate by management and are reviewed from time to time by regulators, they are necessarily approximate and imprecise. There are factors beyond Pinnacle Financial's control, such as conditions in the local, national, and international economy, a local real estate market or particular industry conditions which may materially negatively impact asset quality and the adequacy of the allowance for loan losses and thus the resulting provision for loan losses.
Transfers of Financial Assets	Transfers of Financial Assets — Transfers of financial assets are accounted for as sales when control over the assets has been surrendered or in the case of a loan participation, a portion of the asset has been surrendered and meets the definition of a "participating interest". Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from Pinnacle Financial, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) Pinnacle Financial does not maintain effective control over the transferred assets through an agreement to repurchase them before maturity.
Premises and Equipment and Leaseholds	Premises and Equipment and Leaseholds — Premises and equipment are carried at cost less accumulated depreciation and amortization computed principally by the straight-line method over the estimated useful lives of the assets or the expected lease terms for leasehold improvements, whichever is shorter. Useful lives for all premises and equipment range between three and thirty years. Pinnacle Bank is the lessee with respect to several office locations. All such leases are being accounted for as operating leases within the accompanying consolidated financial statements, with the exception of the one capital lease agreement discussed below. Several of these leases include rent escalation clauses. Pinnacle Bank expenses the costs associated with these escalating payments over the life of the expected lease term using the straight-line method. At December 31, 2017 , the deferred liability associated with these escalating rentals was approximately $3.5 million and is included in other liabilities in the accompanying consolidated balance sheets. Pinnacle Bank has one lease being accounted for as a capital lease within the accompanying consolidated financial statements. Amortization of property under the capital lease is expensed over the life of the expected lease term using the straight-line method and is included in depreciation expense.
Other Real Estate Owned	Other Real Estate Owned — Other real estate owned (OREO) represents real estate foreclosed upon or acquired by deed in lieu of foreclosure by Pinnacle Bank through loan defaults by customers. Substantially all of these amounts relate to lots, homes and residential development projects that are either completed or are in various stages of construction for which Pinnacle Financial believes it has adequately supported the value recorded. Upon its acquisition by Pinnacle Bank, the property is recorded at fair value, based on appraised value, less selling costs estimated as of the date acquired. The difference from the loan balance is recognized as a charge-off through the allowance for loan losses. Additional OREO losses for subsequent downward valuation adjustments and expenses to maintain OREO are determined on a specific property basis and are included as a component of noninterest expense. Net gains or losses realized at the time of disposal are reflected in noninterest expense. Included in the accompanying consolidated balance sheet at December 31, 2017 is $29.1 million of OREO with related property-specific valuation allowances of $1.2 million . At December 31, 2016 , OREO totaled $6.5 million with related property-specific valuation allowances of $381,000 . During the years ended December 31, 2017 , 2016 and 2015 , Pinnacle Financial had expense of $1.1 million , expense of $396,000 and a benefit of $306,000 , respectively, of net foreclosed real estate expense.
Other Assets	Other Assets — Included in other assets as of December 31, 2017 and 2016 , is approximately $9.3 million and $5.7 million , respectively, of computer software related assets, net of amortization. This software supports Pinnacle Financial's primary data systems and relates to amounts paid to vendors for installation and development of such systems. These amounts are amortized on a straight-line basis over periods of three to seven years. For the years ended December 31, 2017 , 2016 , and 2015 , Pinnacle Financial's amortization expense was approximately $2.5 million , $2.3 million , and $1.3 million , respectively. Software maintenance fees are capitalized in other assets and amortized over the term of the maintenance agreement. Pinnacle Financial is required to maintain certain minimum levels of equity investments with certain regulatory and other entities in which Pinnacle Bank has outstanding borrowings, including the Federal Home Loan Bank of Cincinnati. At December 31, 2017 and 2016 , the cost of these investments was $46.4 million and $31.4 million , respectively. Pinnacle Financial determined that cost approximates the fair value of these investments. Additionally, Pinnacle Financial has recorded certain investments in other non-public entities and funds at fair value, of $24.4 million and $8.3 million at December 31, 2017 and 2016 , respectively. During 2017 and 2016 , Pinnacle Financial recorded net losses of $552,310 and $233,000 , respectively, due to changes in the fair value of these investments. As more fully described in Note 11, Pinnacle Financial has an investment in twelve Trusts valued at $3,995,000 as of December 31, 2017 . The Trusts were established to issue preferred securities, the dividends for which are paid with interest payments Pinnacle Financial makes on subordinated debentures it issued to the Trusts. Pinnacle Bank is the owner and beneficiary of various life insurance policies on certain key executives and certain current and former directors and associates, including policies that were acquired in its mergers. Collectively, these policies are reflected in other assets in the accompanying consolidated balance sheets at their respective cash surrender values. At December 31, 2017 and 2016 , the aggregate cash surrender value of these policies was approximately $415.9 million and $150.6 million , respectively. Noninterest income related to these policies was $7.9 million , $3.5 million , and $2.5 million , during the years ended December 31, 2017 , 2016 and 2015 , respectively. Also, as part of our compliance with the Community Reinvestment Act, we have investments in low income housing entities totaling $44.0 million and $43.1 million , net, as of December 31, 2017 and 2016 , respectively. Included in our CRA investments are investments of $23.9 million and $18.9 million at December 31, 2017 and 2016 , respectively, net of amortization, that qualify for federal low income housing tax credits. The investments are accounted for under the proportional amortization method. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received. The amortization and benefits are recognized as a component of income tax expense in the consolidated statements of income. The investments are recorded using the cost method.
Derivative Instruments	Derivative Instruments — In accordance with ASC Topic 815, Derivatives and Hedging , all derivative instruments are recorded on the accompanying consolidated balance sheet at their respective fair values. The accounting for changes in fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship. If the derivative instrument is not designated as a hedge, changes in the fair value of the derivative instrument are recognized in earnings in the period of change. Pinnacle Financial enters into interest rate swaps (swaps) to facilitate customer transactions and meet their financing needs. Upon entering into these instruments to meet customer needs, Pinnacle Financial enters into offsetting positions with large U.S. financial institutions in order to minimize the risk to Pinnacle Financial. These swaps are derivatives, but are not designated as hedging instruments. Pinnacle Financial also has forward cash flow hedge relationships in the form of interest rate swap agreements to manage its future interest rate exposure. These derivative contracts have been designated as a hedge and, as such, changes in the fair value of the derivative instrument are recorded in other comprehensive income. Pinnacle Financial prepares written hedge documentation for all derivatives which are designated as hedges. The written hedge documentation includes identification of, among other items, the risk management objective, hedging instrument, hedged item and methodologies for assessing and measuring hedge effectiveness and ineffectiveness, along with support for management's assertion that the hedge will be highly effective. For designated hedging relationships, Pinnacle Financial performs retrospective and prospective effectiveness testing using quantitative methods and does not assume perfect effectiveness through the matching of critical terms. Assessments of hedge effectiveness and measurements of hedge ineffectiveness are performed at least quarterly. The effective portion of the changes in the fair value of a derivative that is highly effective and that has been designated and qualifies as a cash flow hedge are initially recorded in accumulated other comprehensive income (AOCI) and will be reclassified to earnings in the same period that the hedged item impacts earnings; any ineffective portion is recorded in current period earnings. Hedge accounting ceases on transactions that are no longer deemed effective, or for which the derivative has been terminated or de-designated.
Securities Sold Under Agreements to Repurchase	Securities Sold Under Agreements to Repurchase — Pinnacle Financial routinely sells securities to certain treasury management customers and then repurchases these securities the next day. Securities sold under agreements to repurchase are reflected as a secured borrowing in the accompanying consolidated balance sheets at the amount of cash received in connection with each transaction.
Income Taxes	Income Taxes — ASC 740, Income Taxes , defines the threshold for recognizing the benefits of tax return positions in the financial statements as "more-likely-than-not" to be sustained by the taxing authority. ASU 740 also provides guidance on the derecognition, measurement and classification of income tax uncertainties, along with any related interest and penalties, and includes guidance concerning accounting for income tax uncertainties in interim periods. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. Accordingly, deferred tax assets that will be realized after December 31, 2017 were revalued using the tax rates enacted as a result of the 2017 Tax Cuts and Jobs Act resulting in a revaluation charge of $31.5 million . The net deferred tax asset is reflected as a component of other assets on the consolidated balance sheet. A valuation allowance is required for deferred tax assets if, based on available evidence, it is more likely than not that all or some portion of the asset may not be realized due to the inability to generate sufficient taxable income in the period and/or of the character necessary to utilize the benefit of the deferred tax asset. Income tax expense or benefit for the year is allocated among continuing operations and other comprehensive income (loss), as applicable. The amount allocated to continuing operations is the income tax effect of the pretax income or loss from continuing operations that occurred during the year, plus or minus income tax effects of (i) changes in certain circumstances that cause a change in judgment about the realization of deferred tax assets in future years, including the valuation of deferred tax assets due to changes in enacted income tax rates (ii) changes in income tax laws or rates, and (iii) changes in income tax status, subject to certain exceptions. The amount allocated to other comprehensive income (loss) is related solely to changes in the valuation allowance on items that are normally accounted for in other comprehensive income (loss) such as unrealized gains or losses on available-for-sale securities. In accordance with ASC 740-10, Accounting for Uncertainty in Income Taxes , uncertain tax positions are recognized if it is more likely than not, based on technical merits, that the tax position will be realized or sustained upon examination. The term more likely than not means a likelihood of more than 50 percent; the terms examined and upon examination also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more likely than not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more likely than not recognition threshold considers the facts, circumstances and information available at the reporting date. Pinnacle Financial and its subsidiaries file consolidated U.S. Federal and state income tax returns. Each entity provides for income taxes based on its contribution to income or loss of the consolidated group. Pinnacle Financial has a Real Estate Investment Trust subsidiary that files a separate federal tax return, but its income is included in the consolidated group's return as required by the federal tax laws. Pinnacle Financial remains open to audit under the statute of limitations by the IRS and the states in which Pinnacle operates for the years ended December 31, 2014 through 2017 . Pinnacle Financial's policy is to recognize interest and/or penalties related to income tax matters in income tax expense. No amounts were accrued for interest and/or penalties at December 31, 2017 or 2016. The amount accrued for interest and/or penalties related to state uncertain tax positions at December 31, 2015 was $96,000 . Pinnacle Financial's policy is to recognize interest and/or penalties related to income tax matters in income tax expense.
Income Per Common Share	Income Per Common Share — Basic net income per common share (EPS) is computed by dividing net income by the weighted average common shares outstanding for the period. Diluted EPS reflects the dilution that could occur if securities or other contracts to issue common stock were exercised or converted. The difference between basic and diluted weighted average shares outstanding is attributable to common stock options, common stock appreciation rights, restricted share awards, and restricted share unit awards. The dilutive effect of outstanding options, common stock appreciation rights, restricted share awards, and restricted share unit awards is reflected in diluted EPS by application of the treasury stock method. As of December 31, 2017 , there were 274,586 stock options outstanding to purchase common shares. For the years ended December 31, 2017 , 2016 and 2015 , respectively, 567,611 , 694,909 and 958,320 of dilutive stock options, dilutive restricted shares, restricted share units and stock appreciation rights were included in the diluted earnings per share calculation under the treasury stock method. For the years ended December 31, 2017 , 2016 and 2015 , there were no stock options, restricted shares, restricted share units and stock appreciation rights excluded from the calculation because they were deemed to be antidilutive. The following is a summary of the basic and diluted earnings per share calculation for each of the years in the three-year period ended December 31, 2017 : December 31, 2017 December 31, 2016 December 31, 2015 Basic earnings per share calculation: Numerator - Net income $ 173,979,487 $ 127,224,695 $ 95,509,402 Denominator – Weighted average common shares outstanding 63,760,578 43,037,083 37,015,468 Basic net income per common share $ 2.73 $ 2.96 $ 2.58 Diluted earnings per share calculation: Numerator - Net income $ 173,979,487 $ 127,224,695 $ 95,509,402 Denominator – Weighted average common shares outstanding 63,760,578 43,037,083 37,015,468 Dilutive shares contingently issuable 567,611 694,909 958,320 Weighted average diluted common shares outstanding 64,328,189 43,731,992 37,973,788 Diluted net income per common share $ 2.70 $ 2.91 $ 2.52
Stock-Based Compensation	Stock-Based Compensation — Stock-based compensation expense is recognized based on the fair value of the portion of stock-based payment awards that are ultimately expected to vest, reduced for estimated forfeitures. ASC 718-20, Compensation – Stock Compensation Awards Classified as Equity requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Service based awards with multiple vesting periods are expensed over the entire requisite period as if the award were a single award. For awards with performance vesting criteria, anticipated performance is projected to determine the number of awards expected to vest, and the corresponding aggregate expense is adjusted to reflect the elapsed portion of the applicable performance period.
Comprehensive Income (Loss)	Comprehensive Income (Loss) — Comprehensive income (loss) consists of the total of all components of comprehensive income (loss) including net income (loss). Other comprehensive income (loss) refers to revenues, expenses, gains and losses that under U.S. GAAP are included in comprehensive income (loss) but excluded from net income (loss). Currently, Pinnacle Financial's other comprehensive income (loss) consists of unrealized gains and losses on securities available-for-sale, net of deferred tax expense (benefit) and unrealized gains (losses) on derivative hedging relationships.
Fair Value Measurement	Fair Value Measurement — ASC Topic 820, Fair Value Measurements and Disclosures , which defines fair value, establishes a framework for measuring fair value in U.S. GAAP and established required disclosures about fair value measurements. ASC 820 applies only to fair value measurements that are already required or permitted by other accounting standards and increases the consistency of those measurements. The definition of fair value focuses on the exit price, i.e., the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date, not the entry price, (i.e., the price that would be paid to acquire the asset or received to assume the liability at the measurement date). The statement emphasizes that fair value is a market-based measurement; not an entity-specific measurement. Therefore, the fair value measurement should be determined based on the assumptions that market participants would use in pricing the asset or liability. Pinnacle Financial has an established process for determining fair values. Fair value is based upon quoted market prices, where available. If listed prices or quotes are not available, fair value is based upon internally developed models or processes that use primarily market-based or independently-sourced market data, including interest rate yield curves, option volatilities and third party information such as prices of similar assets or liabilities. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. Furthermore, while Pinnacle Financial believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.
Mortgage Servicing Rights	Mortgage Servicing Rights — In conjunction with the acquisition of Magna, Pinnacle Bank acquired a residential mortgage servicing portfolio which was recorded at fair value upon acquisition. The residential mortgage servicing portfolio was recorded at $6.4 million as of December 31, 2015, net of related amortization. During the first quarter of 2016, Pinnacle Bank sold the mortgage servicing rights associated with the $830 million Fannie Mae portfolio for $6.6 million , net of associated costs to sell. The purchase agreement related to the sale of these rights includes certain clawback provisions which require Pinnacle Bank to reimburse the acquirer in the event certain conditions are met. Approximately $241,000 was recorded as income during the year ended December 31, 2016 related to the sale.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements —
Description of New Accounting Pronouncements Not yet Adopted [Text Block]	Newly Issued not yet Effective Accounting Standards — In February 2018, the FASB issued Accounting Standards Update 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this ASU addressed the income tax accounting treatment of the stranded tax effects within other comprehensive income due to the newly enacted federal corporate tax rate included in the Tax Cuts and Jobs Act issued December 22, 2017. These amendments allow an entity to make a reclassification from other comprehensive income to retained earnings for the difference between the historical corporate income tax rate and the newly enacted corporate income tax rate. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted with retrospective application. Pinnacle Financial is currently evaluating the impact of the new guidance on its consolidated financial statements, but does not expect it to have a material impact. In August 2017, the FASB issued Accounting Standards Update 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities . The amendments in this ASU makes more financial and non-financial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. The amendments will be effective for the Company for interim and annual periods beginning after December 15, 2018. Early adoption is permitted. Pinnacle Financial is currently evaluating the impact of the new guidance on its consolidated financial statements, but does not expect it to have a material impact. In March 2017, the FASB issued Accounting Standards Update 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities . The amendment in this ASU shortens the amortization period for certain callable debt securities held at a premium to the earliest call date. The amendment does not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those periods. Early adoption is permitted with modified retrospective application. Pinnacle Financial is currently evaluating the impact of the new guidance on its consolidated financial statements, but does not expect it to have a material impact. In January 2017, the FASB issued Accounting Standards Update 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment to simplify how entities other than private companies, such as public business entities and not-for-profit entities, are required to test goodwill for impairment by eliminating the comparison of the implied fair value of the reporting unit's goodwill with the carrying amount of that goodwill. The amendments are effective for fiscal years beginning after December 15, 2019, including interim periods within those periods. If this standard had been effective for the year ended December 31, 2017, there would have been no impact on Pinnacle Financial's consolidated financial statements. In January 2017, the FASB issued Accounting Standards Update 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The amendment in this ASU clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) or assets or businesses. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those periods. If this standard had been effective for the year ended December 31, 2017, there would have been no impact on Pinnacle Financial's consolidated financial statements. In February 2016, the FASB issued Accounting Standards Update 2016-02 Leases guidance requiring the recognition in the statement of financial position of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous GAAP. The guidance requires that a lessee should recognize lease assets and lease liabilities as compared to previous GAAP that did not require lease assets and lease liabilities to be recognized for most leases. The guidance becomes effective for us on January 1, 2019. If this standard was effective as of the date of these financial statements, Pinnacle Financial would have recorded a right of use asset and liability in an amount similar to its current future minimum lease obligations as shown in Note 8. Premises and Equipment and Lease Commitments. In June 2016, the FASB issued Accounting Standards Update 2016-13 , Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments , which introduces the current expected credit losses methodology. Among other things, this ASU requires the measurement of all expected credit losses for financial assets, including loans and available-for-sale debt securities, held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. The new model will require institutions to calculate all probable and estimable losses that are expected to be incurred through the loan's entire life. ASU 2016-13 also requires the allowance for credit losses for purchased financial assets with credit deterioration since origination to be determined in a manner similar to that of other financial assets measured at amortized cost; however, the initial allowance will be added to the purchase price rather than recorded as credit loss expense. The disclosure of credit quality indicators related to the amortized cost of financing receivables will be further disaggregated by year of origination (or vintage). Institutions are to apply the changes through a cumulative-effect adjustment to their retained earnings as of the beginning of the first reporting period in which the standard is effective. The amendments are effective for fiscal years beginning after December 15, 2019. Early application will be permitted for fiscal years beginning after December 15, 2018. Pinnacle Financial is currently assessing the impact of the new guidance on its consolidated financial statements. In August 2016, the FASB issued Accounting Standards Update 2016-15 Statement of Cash Flows (Topic 230) intended to reduce the diversity in practice around how certain transactions are classified within the statement of cash flows. The guidance is effective for public companies for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted with retrospective application. Pinnacle Financial does not expect this standard will have a material impact on Pinnacle Financial's consolidated financial statements, with the exception of dividends received from its equity method investments which will be reclassified as a cash flow from investments to operating cash flows beginning in the first quarter of 2018. In May 2014, the FASB issued Accounting Standards Update 2014-09 Revenue from Contracts with Customers (Topic 606 ) developed as a joint project with the International Accounting Standards Board to remove inconsistencies in revenue requirements and provide a more robust framework for addressing revenue issues. This ASU's core principle is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. In August 2015, the FASB issued Accounting Standards Update 2015-14 , which deferred the effective date by one year (i.e., interim and annual reporting periods beginning after December 15, 2017). Early adoption is permitted, but not before the original effective date (i.e., interim and annual reporting periods beginning after December 15, 2016). The ASU may be adopted using either a modified retrospective method or a full retrospective method. Pinnacle Financial adopted the ASU during the first quarter of 2018, as required, using a modified retrospective approach. The majority of Pinnacle Financial's revenue stream is generated from financial instruments which are not within the scope of this ASU. However, Pinnacle Financial has evaluated the impact for other fee-based income, including our wealth management, mortgage and deposit services line of business, and has concluded that this standard will not materially impact its financial statements. Other than those pronouncements discussed above and those which have been recently adopted, there were no other recently issued accounting pronouncements that are expected to materially impact Pinnacle Financial.
Subsequent Events	Subsequent Events — ASC Topic 855, Subsequent Events, establishes general standards of accounting for and disclosure of events that occur after the balance sheet date but before financial statements are issued. Pinnacle Financial evaluated all events or transactions that occurred after December 31, 2017 through the date of the issued financial statements.

Summary of Significant Accoun31

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Activity for Goodwill and Other Intangible Assets	The following table presents activity for goodwill and other intangible assets (in thousands): Goodwill Core deposit and other intangible assets Total Balance at December 31, 2016 $ 551,594 $ 15,104 $ 566,698 Acquisitions 1,256,455 50,422 1,306,877 Amortization — (8,816 ) (8,816 ) Change in purchase price allocation of previous acquisitions — — — Other changes (1) (47 ) — (47 ) Balance at December 31, 2017 $ 1,808,002 $ 56,710 $ 1,864,712 (1) Represents options exercised related to acquisitions which occurred prior to the adoption of ASC 718-20 Compensation .
Gross Carrying Amount and Accumulated Amortization for the Core Deposit and Other Intangible Assets	The following table presents the gross carrying amount and accumulated amortization for the core deposit and other intangible assets, which are subject to amortization (in thousands): December 31, 2017 December 31, 2016 Gross carrying amount $ 92,787 $ 42,365 Accumulated amortization (36,077 ) (27,261 ) Net book value $ 56,710 $ 15,104
Supplemental Cash Flow Information	Cash Equivalents and Cash Flows — Cash on hand, cash items in process of collection, amounts due from banks, Federal funds sold, short-term discount notes and securities purchased under agreements to resell, with original maturities within ninety days, are included in cash and cash equivalents. The following supplemental cash flow information addresses certain cash payments and noncash transactions for each of the years in the three-year period ended December 31, 2017 as follows: For the years ended December 31, 2017 2016 2015 Cash Payments: Interest $ 91,628,041 $ 37,002,870 $ 17,435,292 Income taxes paid 81,538,510 49,503,637 45,715,968 Noncash Transactions: Loans charged-off to the allowance for loan losses 22,046,511 31,112,118 21,148,034 Loans foreclosed upon with repossessions transferred to other real estate 6,227,509 4,453,060 341,342 Loans foreclosed upon with repossessions transferred to other repossessed assets 645,737 1,842,318 8,259,368 Other real estate sales financed 907,931 — — Common stock issued in connection with acquisitions 1,850,968,026 222,162,640 269,492,990
Basic and Diluted Earnings Per Share Calculations	The following is a summary of the basic and diluted earnings per share calculation for each of the years in the three-year period ended December 31, 2017 : December 31, 2017 December 31, 2016 December 31, 2015 Basic earnings per share calculation: Numerator - Net income $ 173,979,487 $ 127,224,695 $ 95,509,402 Denominator – Weighted average common shares outstanding 63,760,578 43,037,083 37,015,468 Basic net income per common share $ 2.73 $ 2.96 $ 2.58 Diluted earnings per share calculation: Numerator - Net income $ 173,979,487 $ 127,224,695 $ 95,509,402 Denominator – Weighted average common shares outstanding 63,760,578 43,037,083 37,015,468 Dilutive shares contingently issuable 567,611 694,909 958,320 Weighted average diluted common shares outstanding 64,328,189 43,731,992 37,973,788 Diluted net income per common share $ 2.70 $ 2.91 $ 2.52

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Business Acquisition [Line Items]
Supplemental Pro Forma Combined Results of Operations	The supplemental proforma information below for the years ended December 31, 2017 and 2016 gives effect to the BNC acquisition as if it had occurred on January 1, 2016. These results combine the historical results of BNC into Pinnacle Financial's consolidated statement of income and, while certain adjustments were made for the estimated impact of certain fair value adjustments, they are not indicative of what would have occurred had the BNC Merger taken place on the indicated date nor are they intended to represent or be indicative of future results of operations. In particular, no adjustments have been made to eliminate the amount of BNC's provision for credit losses for 2016 that may not have been necessary had the acquired loans been recorded at fair value as of the beginning of 2016. Additionally, these financials were not adjusted for non-recurring expenses, such as merger-related charges incurred by either Pinnacle Financial or BNC. Pinnacle Financial expects to achieve operating cost savings and other business synergies as a result of the acquisition which are also not reflected in the proforma amounts. (dollars in thousands) Year ended December 31, 2017 2016 Revenue (1) $ 844,896 $ 707,126 Income before income taxes 347,983 275,635 (1) Net interest income plus noninterest income
Bank of North Carolina [Member]
Business Acquisition [Line Items]
Consideration Paid and Allocation of Purchase Price to Net Assets Acquired	The following summarizes the consideration paid and presents a preliminary allocation of purchase price to net assets acquired (dollars in thousands): Number of Shares Amount Equity consideration Common stock issued 27,687,100 $ 1,858,133 Total equity consideration $ 1,858,133 Non-Equity Consideration: Cash paid to redeem common stock 129 Total consideration paid $ 1,858,262 Allocation of total consideration paid: Fair value of net assets assumed including estimated identifiable intangible assets $ 601,807 Goodwill 1,256,455 $ 1,858,262
Purchase Price Allocations	The acquired assets and liabilities, as well as the adjustments to record the assets and liabilities at their estimated fair values, are presented in the following tables (in thousands): As of June 16, 2017 BNC Historical Cost Basis Fair Value Adjustments (1) As Recorded by Pinnacle Financial Assets Cash and cash equivalents $ 155,271 $ — $ 155,271 Investment securities 643,875 1,667 645,542 Loans, net of allowance for loan losses (2) 5,782,720 (181,430 ) 5,601,290 Mortgage loans held for sale 27,026 — 27,026 Other real estate owned (3) 20,143 600 20,743 Core deposit and other intangible (4) — 50,422 50,422 Property, plant and equipment (5) 156,805 (3,381 ) 153,424 Other assets (6) 320,988 53,997 374,985 Total Assets $ 7,106,828 $ (78,125 ) $ 7,028,703 Liabilities Interest-bearing deposits (7) $ 5,003,653 $ 4,355 $ 5,008,008 Non-interest bearing deposits 1,199,342 — 1,199,342 Borrowings (8) 183,389 (6,412 ) 176,977 Other liabilities (9) 35,729 6,840 42,569 Total Liabilities $ 6,422,113 $ 4,783 $ 6,426,896 Net Assets Acquired $ 684,715 $ (82,908 ) $ 601,807 Explanation of certain fair value adjustments: (1) The amount represents the adjustment of the book value of BNC's assets and liabilities to their estimated fair value on the date of acquisition. Fair value adjustments are updated subsequent to the merger date based on the results of finalized valuation assessments. (2) The amount represents the adjustment of the net book value of BNC's loans to their estimated fair value based on interest rates and expected cash flows as of the date of acquisition, which includes estimates of expected credit losses inherent in the portfolio of approximately 2.6% of the 3.1% mark on the acquired loan portfolio. (3) Although not complete, this adjustment reflects the Day 1 value of OREO properties subsequently sold. (4) The amount represents the fair value of the core deposit intangible asset representing the intangible value of the deposit base acquired and the fair value of the customer relationship intangible assets representing the intangible value of customer relationships acquired. (5) The amount represents the adjustment of the net book value of BNC's property, plant and equipment to estimated fair value based on market values of similar assets. (6) The amount represents the deferred tax asset recognized on the fair value adjustment of BNC's acquired assets and assumed liabilities. (7) The amount represents the adjustment necessary because the weighted average interest rate of BNC's deposits exceeded the cost of similar funding at the time of acquisition. The fair value adjustment will be amortized to reduce future interest expense over the life of the portfolio. (8) The amount represents the combined adjustment necessary because the weighted average interest rate of BNC's subordinated debt issuance exceeded the cost of similar funding at the time of acquisition and because the weighted average interest rate of BNC's trust preferred securities issuances was lower than the cost of similar funding at the time of acquisition. The combined fair value adjustments will be amortized to increase future interest expense over the lives of the portfolios. (9) The amount represents the adjustment to accrue obligations that existed but had not been recorded as of the acquisition date and the fair value of BNC lease obligations.

Equity method investment (Table

Equity method investment (Tables)	12 Months Ended
	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	A summary of BHG's financial position and results of operations as of and for the years ended December 31, 2017 and 2016 , respectively, were as follows (unaudited, in thousands): Banker's Healthcare Group ($ in thousands) December 31, 2017 December 31, 2016 Assets $ 330,030 $ 223,246 Liabilities $ 224,837 $ 139,531 Equity interests 105,193 83,715 Total liabilities and equity $ 330,030 $ 223,246 For the year ended December 31, 2017 2016 Revenues $ 160,209 $ 136,693 Net income, pre-tax $ 77,941 $ 67,135

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Summary of Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities	The amortized cost and fair value of securities available-for-sale and held-to-maturity at December 31, 2017 and 2016 are summarized as follows (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2017 Securities available-for-sale: U.S Treasury securities $ 30,505 $ — $ 60 $ 30,445 U.S. Government agency securities 182,500 67 1,766 180,801 Mortgage-backed securities 1,270,625 5,318 12,124 1,263,819 State and municipal securities 774,949 12,251 2,588 784,612 Asset-backed securities 173,346 262 316 173,292 Corporate notes 81,615 1,346 647 82,314 $ 2,513,540 $ 19,244 $ 17,501 $ 2,515,283 Securities held-to-maturity: State and municipal securities 20,762 114 46 20,830 $ 20,762 $ 114 $ 46 $ 20,830 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value December 31, 2016 Securities available-for-sale: U.S Treasury securities $ 250 $ — $ — $ 250 U.S. Government agency securities 22,306 — 537 21,769 Mortgage-backed securities 988,008 4,304 15,686 976,626 State and municipal securities 211,581 4,103 2,964 212,720 Asset-backed securities 79,318 111 849 78,580 Corporate notes 8,608 39 46 8,601 $ 1,310,071 $ 8,557 $ 20,082 $ 1,298,546 Securities held-to-maturity: State and municipal securities 25,251 87 105 25,233 $ 25,251 $ 87 $ 105 $ 25,233 At December 31, 2017 , approximately $1.1 billion of Pinnacle Financial's investment portfolio was pledged to secure public funds and other deposits and securities sold under agreements to repurchase. At December 31, 2017 , repurchase agreements comprised of secured borrowings totaled $135.3 million and were secured by $135.3 million of pledged U.S. government agency securities, municipal securities, asset backed securities, and corporate debentures. As the fair value of securities pledged to secure repurchase agreements may decline, Pinnacle Financial regularly evaluates its need to pledge additional securities for the counterparty to remain adequately secured.
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity	The amortized cost and fair value of debt securities as of December 31, 2017 by contractual maturity are shown below. Actual maturities may differ from contractual maturities of mortgage-backed securities since the mortgages underlying the securities may be called or prepaid with or without penalty. Therefore, these securities are not included in the maturity categories in the following summary (in thousands): Available-for-sale Held-to-maturity Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 33,251 $ 33,196 $ 1,329 $ 1,330 Due in one year to five years 65,214 65,775 6,210 6,200 Due in five years to ten years 185,337 187,198 10,425 10,469 Due after ten years 785,767 792,003 2,798 2,831 Mortgage-backed securities 1,270,625 1,263,819 — — Asset-backed securities 173,346 173,292 — — $ 2,513,540 $ 2,515,283 $ 20,762 $ 20,830
Classification of Investments According to Term of Unrealized Losses of Less than Twelve Months or Twelve Months or Longer	At December 31, 2017 and 2016 , included in securities were the following investments with unrealized losses. The information below classifies these investments according to the term of the unrealized loss of less than twelve months or twelve months or longer (in thousands): Investments with an Unrealized Loss of less than 12 months Investments with an Unrealized Loss of 12 months or longer Total Investments with an Unrealized Loss Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses December 31, 2017 U.S. Treasury securities $ 29,948 $ 60 $ — $ — $ 29,948 $ 60 U.S. government agency securities 173,677 1,766 — — 173,677 1,766 Mortgage-backed securities 607,408 5,042 285,561 7,082 892,969 12,124 State and municipal securities 115,403 1,408 50,083 1,226 165,486 2,634 Asset-backed securities 68,742 198 14,136 118 82,878 316 Corporate notes 22,168 547 11,944 100 34,112 647 Investments with an Unrealized Loss of less than 12 months Investments with an Unrealized Loss of 12 months or longer Total Investments with an Unrealized Loss Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Total temporarily-impaired securities $ 1,017,346 $ 9,021 $ 361,724 $ 8,526 $ 1,379,070 $ 17,547 December 31, 2016 U.S. Treasury securities $ — $ — $ — $ — $ — $ — U.S. government agency securities — — 20,820 537 20,820 537 Mortgage-backed securities 801,213 15,073 43,148 613 844,361 15,686 State and municipal securities 87,277 3,068 312 1 87,589 3,069 Asset-backed securities 14,510 32 34,097 817 48,607 849 Corporate notes 4,810 46 — — 4,810 46 Total temporarily-impaired securities $ 907,810 $ 18,219 $ 98,377 $ 1,968 $ 1,006,187 $ 20,187

Loans and Allowance for Loan 35

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Loans and Allowance for Loan Losses - Purchase Credit Impaired	Purchase credit impaired loans purchased during the year ended December 31, 2017 for which it was probable at acquisition that all contractually required payments would not be collected are as follows (in thousands): December 31, 2017 2016 2015 Contractually required payments receivable $ 94,312 $ 1,359 $ 19,960 Cash flows expected to be collected at acquisition 48,498 547 14,257 Fair value of acquired loans at acquisition 48,302 547 14,257
Summary of Amount of Each Loan Classification, Categorized into Each Risk Rating Class	The following table outlines the amount of each loan classification categorized into each risk rating category as of December 31, 2017 and 2016 (in thousands): December 31, 2017 Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer and other Total Pass $ 6,487,368 $ 2,503,688 $ 1,880,704 $ 4,014,656 $ 351,359 $ 15,237,775 Special Mention 94,134 18,356 8,148 46,898 1,177 168,713 Substandard (1) 72,044 21,053 13,468 62,529 79 169,173 Substandard-nonaccrual 16,064 18,117 5,968 17,258 48 57,455 Doubtful-nonaccrual — — — — — — Total loans $ 6,669,610 $ 2,561,214 $ 1,908,288 $ 4,141,341 $ 352,663 $ 15,633,116 December 31, 2016 Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer Total Pass $ 3,137,452 $ 1,160,361 $ 897,556 $ 2,782,713 $ 264,723 $ 8,242,805 Special Mention 21,449 1,856 2,716 25,641 802 52,464 Substandard (1) 29,674 15,627 5,788 75,861 129 127,079 Substandard-nonaccrual 4,921 8,073 6,613 7,492 475 27,574 Doubtful-nonaccrual — — — 3 — 3 Total loans $ 3,193,496 $ 1,185,917 $ 912,673 $ 2,891,710 $ 266,129 $ 8,449,925 (1) Potential problem loans represent those loans with a well-defined weakness and where information about possible credit problems of borrowers has caused management to have doubts about the borrower's ability to comply with present repayment terms. This definition is believed to be substantially consistent with the standards established by Pinnacle Bank's primary regulators for loans classified as substandard, excluding the impact of substandard nonperforming loans and substandard troubled debt restructurings. Potential problem loans, which are not included in nonperforming assets, amounted to approximately $164.0 million at December 31, 2017 , compared to $114.6 million at December 31, 2016 .
Purchase Credit Impaired Loans	The following table provides a rollforward of purchase credit impaired loans from December 31, 2016 through December 31, 2017 (in thousands): Gross Carrying Value Accretable Yield Nonaccretable Yield Carrying Value December 31, 2015 $ 16,274 $ — $ (4,143 ) $ 12,131 Acquisitions 1,359 — (812 ) 547 Settlements, net (5,165 ) — 1,322 (3,843 ) December 31, 2016 12,468 — (3,633 ) 8,835 Acquisitions 80,812 (196 ) (32,314 ) 48,302 Settlements, net (18,956 ) 64 4,410 (14,482 ) December 31, 2017 $ 74,324 $ (132 ) $ (31,537 ) $ 42,655
Summary of Recorded Investment, Unpaid Principal Balance and Related Allowance and Average Recorded Investment of Impaired Loans	ettlements include both loans that were charged-off as well as loans that were paid off, typically as a result of refinancings at other institutions. Purchase credit impaired loans purchased during the year ended December 31, 2017 for which it was probable at acquisition that all contractually required payments would not be collected are as follows (in thousands): December 31, 2017 2016 2015 Contractually required payments receivable $ 94,312 $ 1,359 $ 19,960 Cash flows expected to be collected at acquisition 48,498 547 14,257 Fair value of acquired loans at acquisition 48,302 547 14,257 The following tables detail the recorded investment, unpaid principal balance and related allowance and average recorded investment of our nonaccrual loans at December 31, 2017 , 2016 and 2015 by loan classification and the amount of interest income recognized on a cash basis throughout the year-to-date period then ended, respectively, on these loans that remain on the balance sheets (in thousands): December 31, 2017 For the year ended Recorded investment Unpaid principal balance Related allowance Average recorded investment Cash basis interest income recognized Collateral dependent nonaccrual loans: Commercial real estate – mortgage $ 13,570 $ 16,631 $ 38 $ 13,839 $ — Consumer real estate – mortgage 10,093 14,309 115 11,216 — Construction and land development 5,735 10,273 6 5,935 95 Commercial and industrial 2,135 3,533 362 2,980 — Consumer and other — — — — — Total $ 31,533 $ 44,746 $ 521 $ 33,970 $ 95 Cash flow dependent nonaccrual loans: Commercial real estate – mortgage $ 2,494 $ 2,505 $ 95 $ 3,463 $ — Consumer real estate – mortgage 8,024 8,079 411 10,076 — Construction and land development 233 233 12 438 — Commercial and industrial 15,171 15,224 1,278 18,027 — Consumer and other — — — — — Total $ 25,922 $ 26,041 $ 1,796 $ 32,004 $ — Total Nonaccrual Loans $ 57,455 $ 70,787 $ 2,317 $ 65,974 $ 95 December 31, 2016 For the year ended Recorded investment Unpaid principal balance Related allowance Average recorded investment Cash basis interest income recognized Collateral dependent nonaccrual loans: Commercial real estate – mortgage $ 2,308 $ 2,312 $ — $ 2,540 $ — Consumer real estate – mortgage 2,880 2,915 — 2,907 — Construction and land development 3,128 3,135 — 3,132 159 Commercial and industrial 6,373 6,407 — 8,841 — Consumer and other — — — — — Total $ 14,689 $ 14,769 $ — $ 17,420 $ 159 Cash flow dependent nonaccrual loans: Commercial real estate – mortgage $ 2,613 $ 3,349 $ 59 $ 2,688 $ — Consumer real estate – mortgage 5,193 5,775 688 5,966 — Construction and land development 3,485 4,154 20 3,476 — Commercial and industrial 1,122 2,714 77 2,884 — Consumer and other 475 851 227 2,624 — Total $ 12,888 $ 16,843 $ 1,071 $ 17,638 $ — Total Nonaccrual Loans $ 27,577 $ 31,612 $ 1,071 $ 35,058 $ 159 December 31, 2015 For the year ended Recorded investment Unpaid principal balance Related allowance Average recorded investment Cash basis interest income recognized Collateral dependent nonaccrual loans: Commercial real estate – mortgage $ 4,411 $ 5,659 $ — $ 2,253 $ — Consumer real estate – mortgage 5,596 6,242 — 3,067 — Construction and land development 7,531 7,883 — 4,317 308 Commercial and industrial 1,420 3,151 — 1,527 — Consumer and other — — — — — Total $ 18,958 $ 22,935 $ — $ 11,164 $ 308 Cash flow dependent nonaccrual loans: Commercial real estate – mortgage $ 1,410 $ 1,661 $ 20 $ 1,466 $ — Consumer real estate – mortgage 3,750 4,098 616 3,815 — Construction and land development 76 125 12 87 — Commercial and industrial 263 281 19 168 — Consumer and other 4,902 5,341 3,002 4,913 — Total $ 10,401 $ 11,506 $ 3,669 $ 10,449 $ — Total Nonaccrual Loans $ 29,359 $ 34,441 $ 3,669 $ 21,613 $ 308
Amount of Troubled Debt Restructuring Categorized by Loan Classification	The following table outlines the amount of each troubled debt restructuring by loan classification made during the years ended December 31, 2017 , 2016 and 2015 (dollars in thousands): Number of contracts Pre Modification Outstanding Recorded Investment Post Modification Outstanding Recorded Investment, net of related allowance December 31, 2017 Commercial real estate – mortgage — $ — $ — Consumer real estate – mortgage 1 6 5 Construction and land development — — — Commercial and industrial 2 3,776 3,751 Consumer and other — — — 3 $ 3,782 $ 3,756 December 31, 2016 Commercial real estate – mortgage — $ — $ — Consumer real estate – mortgage — — — Construction and land development — — — Commercial and industrial 6 11,084 11,083 Consumer and other — — — 6 $ 11,084 $ 11,083 Number of contracts Pre Modification Outstanding Recorded Investment Post Modification Outstanding Recorded Investment, net of related allowance December 31, 2015 Commercial real estate – mortgage 1 $ 223 $ 185 Consumer real estate – mortgage — — — Construction and land development — — — Commercial and industrial 1 434 337 Consumer and other — — — 2 $ 657 $ 522 During the years ended December 31, 2017 , 2016 and 2015 , Pinnacle Financial had no troubled debt restructurings that subsequently defaulted within twelve months of the restructuring. A default is defined as an occurrence which violates the terms of the receivable's contract.
Summary of Loan Portfolio Credit Risk Exposure	In addition to the loan metrics above, Pinnacle Financial analyzes its commercial loan portfolio to determine if a concentration of credit risk exists to any industries. Pinnacle Financial utilizes broadly accepted industry classification systems in order to classify borrowers into various industry classifications. Pinnacle Financial has a credit exposure (loans outstanding plus unfunded lines of credit) exceeding 25% of Pinnacle Bank's total risk-based capital to borrowers in the following industries at December 31, 2017 with the comparative exposures for December 31, 2016 (in thousands): At December 31, 2017 Outstanding Principal Balances Unfunded Commitments Total exposure Total Exposure at Lessors of nonresidential buildings $ 2,778,454 $ 32,497 $ 2,810,951 $ 1,701,853 Lessors of residential buildings 870,777 13,467 884,244 874,234 Hotels and motels 627,126 1,865 628,991 291,865
Past Due Balances by Loan Classification	The table below presents past due balances at December 31, 2017 and 2016 , by loan classification and segment allocated between performing and nonperforming status (in thousands): 30-89 days past due and performing 90 days or more past due and performing Total past due and performing Current Purchase credit impaired Nonaccrual (1) Nonaccruing purchase credit impaired Total Loans December 31, 2017 Commercial real estate: Owner-occupied $ 6,772 $ 104 $ 6,876 $ 2,435,819 $ 4,820 $ 11,395 $ 1,105 $ 2,460,015 All other 16,559 — 16,559 4,177,454 12,018 704 2,860 4,209,595 Consumer real estate – mortgage 14,835 1,265 16,100 2,521,748 5,249 9,320 8,797 2,561,214 Construction and land development 4,136 146 4,282 1,894,560 3,478 2,878 3,090 1,908,288 Commercial and industrial 7,406 1,348 8,754 4,114,127 1,154 17,222 84 4,141,341 Consumer and other 6,311 1,276 7,587 345,076 — — — 352,663 $ 56,019 $ 4,139 $ 60,158 $ 15,488,784 $ 26,719 $ 41,519 $ 15,936 $ 15,633,116 December 31, 2016 Commercial real estate: Owner-occupied $ 3,505 $ — $ 3,505 $ 1,347,134 $ — $ 2,297 $ 1,957 $ 1,354,893 All other — — — 1,837,936 — 239 428 1,838,603 Consumer real estate – mortgage 3,838 53 3,891 1,173,953 — 5,553 2,520 1,185,917 Construction and land development 2,210 — 2,210 903,850 — 3,205 3,408 912,673 Commercial and industrial 4,475 — 4,475 2,879,740 — 6,971 524 2,891,710 Consumer and other 7,168 1,081 8,249 257,405 — 475 — 266,129 $ 21,196 $ 1,134 $ 22,330 $ 8,400,018 $ — $ 18,740 $ 8,837 $ 8,449,925 (1) Approximately $45.8 million and $16.7 million of nonaccrual loans as of December 31, 2017 and 2016 , respectively, are currently performing pursuant to their contractual terms.
Details of Changes in the Allowance for Loan Losses	The following table details the changes in the allowance for loan losses from December 31, 2015 to December 31, 2016 to December 31, 2017 by loan classification and the allocation of allowance for loan losses (in thousands): Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer and other Unallocated Total Allowance for Loan Losses: Balance at December 31, 2014 $ 22,202 $ 5,424 $ 5,724 $ 29,167 $ 1,570 $ 3,272 $ 67,359 Charged-off loans (384 ) (365 ) (190 ) (2,207 ) (18,002 ) — (21,148 ) Recovery of previously charged-off loans 85 874 1,479 1,730 5,865 — 10,033 Provision for loan losses (6,390 ) 1,287 (4,110 ) (5,047 ) 26,183 (2,735 ) 9,188 Balance at December 31, 2015 $ 15,513 $ 7,220 $ 2,903 $ 23,643 $ 15,616 $ 537 $ 65,432 Collectively evaluated for impairment $ 15,452 $ 6,109 $ 2,891 $ 22,669 $ 12,609 $ 59,730 Individually evaluated for impairment 61 1,111 12 974 3,007 5,165 Loans acquired with deteriorated credit quality — — — — — — Balance at December 31, 2015 $ 15,513 $ 7,220 $ 2,903 $ 23,643 $ 15,616 $ 537 $ 65,432 Loans: Collectively evaluated for impairment $ 2,269,439 $ 1,033,479 $ 740,090 $ 2,222,714 $ 240,066 $ 6,505,788 Individually evaluated for impairment 2,420 8,986 3,689 5,288 4,930 25,313 Loans acquired with deteriorated credit quality 3,624 4,052 3,918 540 — 12,134 Balance at December 31, 2015 $ 2,275,483 $ 1,046,517 $ 747,697 $ 2,228,542 $ 244,996 $ 6,543,235 Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer and other Unallocated Total Allowance for Loan Losses: Balance at December 31, 2015 $ 15,513 $ 7,220 $ 2,903 $ 23,643 $ 15,616 $ 537 $ 65,432 Charged-off loans (276 ) (788 ) (231 ) (5,801 ) (24,016 ) — (31,112 ) Recovery of previously charged-off loans 208 546 545 2,138 2,895 — 6,332 Provision for loan losses (1,790 ) (414 ) 407 4,763 15,025 337 18,328 Balance at December 31, 2016 $ 13,655 $ 6,564 $ 3,624 $ 24,743 $ 9,520 $ 874 $ 58,980 Collectively evaluated for impairment $ 13,595 $ 5,874 $ 3,604 $ 24,648 $ 9,293 $ 57,014 Individually evaluated for impairment 60 690 20 95 227 1,092 Loans acquired with deteriorated credit quality — — — — — — Balance at December 31, 2016 $ 13,655 $ 6,564 $ 3,624 $ 24,743 $ 9,520 $ 874 $ 58,980 Loans: Collectively evaluated for impairment $ 3,188,361 $ 1,174,456 $ 906,053 $ 2,872,855 $ 265,613 $ 8,407,338 Individually evaluated for impairment 2,750 8,941 3,212 18,331 516 33,750 Loans acquired with deteriorated credit quality 2,385 2,520 3,408 524 — 8,837 Balance at December 31, 2016 $ 3,193,496 $ 1,185,917 $ 912,673 $ 2,891,710 $ 266,129 $ 8,449,925 Commercial real estate - mortgage Consumer real estate - mortgage Construction and land development Commercial and industrial Consumer and other Unallocated Total Allowance for Loan Losses: Balance at December 31, 2016 $ 13,655 $ 6,564 $ 3,624 $ 24,743 $ 9,520 $ 874 $ 58,980 Charged-off loans (633 ) (1,461 ) (137 ) (4,297 ) (15,518 ) — (22,047 ) Recovery of previously charged-off loans 671 1,516 1,136 1,317 2,002 — 6,642 Provision for loan losses 7,495 (1,588 ) 4,339 3,100 9,870 448 23,664 Balance at December 31, 2017 $ 21,188 $ 5,031 $ 8,962 $ 24,863 $ 5,874 $ 1,322 $ 67,240 Collectively evaluated for impairment $ 20,753 $ 4,460 $ 8,879 $ 23,181 $ 5,874 $ 63,147 Individually evaluated for impairment 95 410 66 1,627 — 2,198 Loans acquired with deteriorated credit quality 340 161 17 55 — 573 Balance at December 31, 2017 $ 21,188 $ 5,031 $ 8,962 $ 24,863 $ 5,874 $ 1,322 $ 67,240 Loans: Collectively evaluated for impairment $ 6,630,593 $ 2,534,996 $ 1,896,553 $ 4,116,677 $ 352,663 $ 15,531,482 Individually evaluated for impairment 18,214 12,172 5,167 23,426 — 58,979 Loans acquired with deteriorated credit quality 20,803 14,046 6,568 1,238 — 42,655 Balance at December 31, 2017 $ 6,669,610 $ 2,561,214 $ 1,908,288 $ 4,141,341 $ 352,663 $ 15,633,116

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2015
Mortgage Servicing Rights [Abstract]
Schedule of Mortgage Servicing Rights at Carrying Values	Mortgage servicing rights (MSRs) are recorded at the lower of cost or market in "Other assets" on Pinnacle Financial's consolidated balance sheets and are amortized over the remaining life of the loans and written off when a mortgage loan prepays prior to maturity. Mortgage servicing rights had the following carrying values as of December 31, 2015 (in thousands): 2015 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Mortgage servicing rights $ 6,802 $ (390 ) $ 6,412
Changes in Mortgage Servicing Right	The following table provides a detail of changes in the mortgage servicing right from September 1, 2015, the closing date of the Magna Merger, to December 31, 2015: Residential Beginning balance acquired in Magna Merger $ 6,641 Add: Capitalized MSRs 161 Less: Amortization 390 Ending balance $ 6,412
Summary of Net Servicing Fee Revenues	Income and expense associated with these MSRs, which includes servicing fees, late charges, guarantee fees and loan payoff interest, is recorded on a cash basis which approximates income as would be recorded on a U.S. GAAP basis. The following table summarizes the net servicing fee revenues for the year ended December 31, 2015 (in thousands): Residential Gross servicing fees $ 1,090 Late charges and other ancillary revenue 160 Gross servicing revenue $ 1,250 Servicing asset amortization $ 386 Guaranty fees and loan pay-off interest 9 Other servicing expenses 51 Gross servicing expenses $ 446 Net servicing fee income $ 804 During the first quarter of 2016, in conjunction with a decision to exit the residential servicing line of business, Pinnacle Bank sold the mortgage servicing rights associated with the $830 million Fannie Mae portion of the residential servicing portfolio for $6.6 million , net of associated costs to sell. Approximately $241,000 was recorded as income during the year ended December 31, 2016 as a result of the sale.

Premises and Equipment and Le37

Premises and Equipment and Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2017
Premises and Equipment and Lease Commitments [Abstract]
Schedule of Premises and Equipment	Premises and equipment at December 31, 2017 and 2016 are summarized as follows (in thousands): Range of Useful Lives 2017 2016 Land Not applicable $ 65,649 $ 19,467 Buildings 15 to 30 years 164,748 64,088 Leasehold improvements 15 to 20 years 38,913 28,789 Furniture and equipment 3 to 20 years 93,841 62,982 363,151 175,326 Accumulated depreciation and amortization (97,137 ) (86,422 ) $ 266,014 $ 88,904
Schedule of Future Minimum Lease Payments Due Under Operating Leases	Pinnacle Financial has entered into various operating leases, primarily for office space and branch facilities. Rent expense related to these leases for 2017 , 2016 and 2015 totaled $11.7 million , $8.4 million and $5.9 million , respectively. At December 31, 2017 , the approximate future minimum lease payments due under the aforementioned operating leases for their base term are as follows (in thousands): 2018 $ 12,226 2019 11,535 2020 10,949 2021 10,652 2022 8,429 Thereafter 42,857 $ 96,648
Schedule of Future Minimum Lease Payments for Capital Leases	During 2016 and as a result of the acquisition of Avenue, Pinnacle Financial has entered into a single capital lease, primarily for office space at an interest rate of 7.22% per year. Rent expense related to this lease for 2017 was approximately $225,000 and is included in total rent expense above. At December 31, 2017 , the approximate future minimum lease payments due under the aforementioned capital lease for its base term are as follows (in thousands): 2018 $ 426 2019 470 2020 470 2021 470 2022 470 Thereafter 3,028 Total minimum lease payments $ 5,334 Less: amount representing interest (1,695 ) Present value of net minimum lease payments $ 3,639

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2017
Interest-bearing Deposit Liabilities [Abstract]
Scheduled Maturities of Time Deposits	At December 31, 2017 , the scheduled maturities of time deposits are as follows (in thousands): 2018 $ 1,850,523 2019 445,198 2020 123,000 2021 95,754 2022 17,244 Thereafter 2,342 $ 2,534,061

Federal Home Loan Bank Advanc39

Federal Home Loan Bank Advances (Tables)	12 Months Ended
	Dec. 31, 2016
Advances from Federal Home Loan Banks [Abstract]
Scheduled Maturities of Advances and Interest Rates	At December 31, 2017 and 2016 , Pinnacle Financial had received advances from the FHLB totaling $1.3 billion and $406.2 million , respectively. Additionally, Pinnacle Financial recognized a discount of $167,000 on FHLB advances in conjunction with its acquisition of Avenue in July 2016. At December 31, 2017 and 2016, respectively, the remaining discount was $13,000 and $92,000 . At December 31, 2017 , the scheduled maturities of FHLB advances and interest rates are as follows (in thousands): Scheduled Maturities Weighted average interest rates 2018 $ 557,501 1.46 % 2019 356,000 1.64 % 2020 272,627 1.74 % 2021 133,750 1.87 % 2022 — — Thereafter 17 2.75 % $ 1,319,895 Weighted average interest rate 1.61 %

Other borrowings Other Borrowin

Other borrowings Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Instrument [Line Items]
Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]	Name Date Established Maturity Total Debt Outstanding Interest Rate at December 31, 2017 Coupon Structure Trust preferred securities Pinnacle Statutory Trust I December 29, 2003 December 30, 2033 $ 10,310 4.40 % 30-day LIBOR + 2.80% Pinnacle Statutory Trust II September 15, 2005 September 30, 2035 20,619 3.09 % 30-day LIBOR + 1.40% Pinnacle Statutory Trust III September 7, 2006 September 30, 2036 20,619 3.34 % 30-day LIBOR + 1.65% Pinnacle Statutory Trust IV October 31, 2007 September 30, 2037 30,928 4.44 % 30-day LIBOR + 2.85% BNC Capital Trust I April 3, 2003 April 15, 2033 5,155 4.61 % 30-day LIBOR + 3.25% BNC Capital Trust II March 11, 2004 April 7, 2034 6,186 4.21 % 30-day LIBOR + 2.85% BNC Capital Trust III September 23, 2004 September 23, 2034 5,155 3.76 % 30-day LIBOR + 2.40% BNC Capital Trust IV September 27, 2006 December 31, 2036 7,217 3.39 % 30-day LIBOR + 1.70% Valley Financial Trust I August 5, 2005 September 30, 2035 4,124 4.77 % 30-day LIBOR + 3.10% Valley Financial Trust II June 6, 2003 June 26, 2033 7,217 3.08 % 30-day LIBOR + 1.49% Valley Financial Trust III September 26, 2005 December 15, 2035 5,155 3.11 % 30-day LIBOR + 1.73% Southcoast Capital Trust III December 15, 2006 January 30, 2037 10,310 3.19 % 30-day LIBOR + 1.50% Subordinated Debt Pinnacle Bank Subordinated Notes July 30, 2015 July 30, 2025 60,000 4.88 % Fixed (1) Pinnacle Bank Subordinated Notes March 10, 2016 July 30, 2025 70,000 4.88 % Fixed (1) Avenue Subordinated Notes December 29, 2014 December 29, 2024 20,000 6.75 % Fixed (2) Pinnacle Financial Subordinated Notes November 16, 2016 November 16, 2026 120,000 5.25 % Fixed (3) BNC Subordinated Notes September 25, 2014 October 1, 2024 60,000 5.50 % Fixed (4) BNC Subordinated Note October 15, 2013 October 15, 2023 10,500 6.35 % 30-day LIBOR + 5.0% (5) Other Borrowings Revolving credit facility (6) March 29, 2016 March 27, 2018 — Debt issuance costs and fair value adjustment (7,990 ) Total subordinated debt and other borrowings $ 465,505 (1) Migrates to three month LIBOR + 3.128% beginning July 30, 2020 through the end of the term. (2) Migrates to three month LIBOR + 4.95% beginning January 1, 2020 through the end of the term. (3) Migrates to three month LIBOR + 3.884% beginning November 16, 2021 through the end of the term. (4) Migrates to three month LIBOR + 3.59% beginning October 1, 2019 through the end of the term if not redeemed on that date. (5) Coupon structure includes a floor of 5.0% and a cap of 9.5%. (6) Borrowing capacity on the revolving credit facility is $75.0 million. At December 31, 2017, there was no outstanding balance under this facility. The rate under this facility is 2.25% plus the greater of zero percent and 30-day LIBOR with a maturity date of March 27, 2018 and an unused fee of 0.35% of average daily unused amount of loan.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit) attributable to continuing operations	Income tax expense attributable to continuing operations for each of the years ended December 31 is as follows (in thousands): 2017 2016 2015 Current tax expense : Federal $ 63,496 $ 49,769 $ 41,721 State 860 — 48 Total current tax expense 64,356 49,769 41,769 Deferred tax expense: Federal 26,339 12,776 4,963 State 1,826 1,614 857 Deferred tax revaluation expense 31,486 — — Total deferred tax expense 59,651 14,390 5,819 Total income tax expense $ 124,007 $ 64,159 $ 47,589
Income tax rate reconciliation	Pinnacle Financial's income tax expense differs from the amounts computed by applying the Federal income tax statutory rates of 35% to income (loss) before income taxes. A reconciliation of the differences for each of the years in the three-year period ended December 31, 2017 is as follows (in thousands): 2017 2016 2015 Income tax expense at statutory rate $ 104,295 $ 66,984 $ 50,084 State excise tax expense, net of federal tax effect 1,746 1,049 588 Tax-exempt securities (5,666 ) (2,510 ) (2,543 ) Federal tax credits (434 ) (282 ) — Bank owned life insurance (2,778 ) (1,242 ) (892 ) Insurance premiums (283 ) (159 ) (306 ) Revaluation of deferred tax assets and liabilities due to Tax Cuts and Jobs Act 31,486 — — Excess tax benefits associated with equity compensation (5,365 ) — — Change in uncertain tax positions — — — Other items 1,006 319 658 Income tax expense $ 124,007 $ 64,159 $ 47,589
Components of deferred income taxes included in other assets	The components of deferred income taxes included in other assets in the accompanying consolidated balance sheets at December 31, 2017 and 2016 are as follows (in thousands): 2017 2016 Deferred tax assets: Loan loss allowance $ 16,240 $ 22,308 Loans 46,567 15,534 Insurance 614 869 Accrued liability for supplemental retirement agreements 7,413 5,587 Restricted stock and stock options 8,232 8,643 Securities — 4,275 Cash flow hedge 499 1,520 Equity method investment 635 858 Leases 1,738 1,627 Other real estate owned 2,809 149 Net federal operating loss carryforward and credits 18,085 — Other deferred tax assets 5,373 6,413 Total deferred tax assets 108,205 67,783 Deferred tax liabilities: Depreciation and amortization 11,504 5,823 Core deposit intangible asset 14,073 5,621 Securities 616 — REIT dividends 3,073 4,602 FHLB related liabilities 922 285 Subordinated debt 1,077 1,001 Other deferred tax liabilities 1,171 679 Total deferred tax liabilities 32,436 18,011 Net deferred tax assets $ 75,769 $ 49,772
Rollforward of uncertain tax positions	A reconciliation of the beginning and ending unrecognized tax benefit related to state uncertain tax positions is as follows (in thousands): 2017 2016 2015 Balance at January 1, $ 1,274 $ 134 $ 391 Increases (decreases) due to tax positions taken during the current year 1,564 1,140 (257 ) Increases due to tax positions taken during a prior year — — — Decreases due to the lapse of the statute of limitations during the current year — — — Decreases due to settlements with the taxing authorities during the current year — — — Balance at December 31, $ 2,838 $ 1,274 $ 134

Stock Options, Stock Apprecia42

Stock Options, Stock Appreciation Rights, Restricted Shares and Salary Stock Units (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option and Stock Appreciation Rights Activity	Number Weighted- Average Exercise Price Weighted- Average Contractual Remaining Term (in years) Aggregate Intrinsic Value (1) (000's) Outstanding at December 31, 2014 698,488 $ 26.89 Options acquired upon acquisition of CapitalMark 858,148 17.62 Granted — — Stock options exercised (303,754 ) 24.09 Stock appreciation rights exercised (2) (1,276 ) 15.60 Forfeited (5 ) 23.88 Outstanding at December 31, 2015 1,251,601 $ 21.23 Granted — — Stock options exercised (698,673 ) 21.63 Stock appreciation rights exercised (2) (2,435 ) 15.60 Forfeited (3 ) 29.50 Outstanding at December 31, 2016 550,490 $ 20.75 Granted — — Stock options exercised (3) (275,904 ) 20.09 Forfeited — — Outstanding at December 31, 2017 274,586 $ 21.40 3.06 $ 12,329 Options exercisable at December 31, 2017 274,586 $ 21.40 3.06 $ 12,329 (1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted price of Pinnacle Financial Common Stock of $66.30 per common share at December 31, 2017 for the 274,586 options that were in-the-money at December 31, 2017 . (2) The 1,276 stock appreciation rights exercised during 2015 settled in 559 shares of Pinnacle Financial Common Stock. The 2,435 stock appreciation rights exercised during 2016 settled in 1,137 shares of Pinnacle Financial Common Stock.
Summary of Activity for Unvested Restricted Share Awards	Number Grant Date Weighted-Average Cost Unvested at December 31, 2014 849,198 $ 24.26 Shares awarded 231,504 45.71 Conversion of previously granted restricted share units to restricted share awards 43,711 34.50 Restrictions lapsed and shares released to associates/directors (240,102 ) 23.00 Shares forfeited (17,997 ) 30.01 Unvested at December 31, 2015 866,314 $ 31.39 Shares awarded 177,664 48.61 Conversion of previously granted restricted share units to restricted share awards 43,694 46.37 Restrictions lapsed and shares released to associates/directors (245,873 ) 28.39 Shares forfeited (21,260 ) 39.88 Unvested at December 31, 2016 820,539 $ 36.47 Shares awarded 261,942 67.14 Conversion of previously granted restricted share units to restricted share awards 43,680 69.40 Shares assumed in connection with acquisition of BNC 136,890 67.25 Restrictions lapsed and shares released to associates/directors (292,896 ) 37.59 Shares forfeited (34,020 ) 54.71 Unvested at December 31, 2017 936,135 $ 50.08 Pinnacle Financial grants restricted share awards to associates (including members of executive management) and outside directors with a combination of time and, in the case of executive management, performance vesting criteria. The following tables outline restricted stock grants that were made by grant year, grouped by similar vesting criteria, during the three year period ended December 31, 2017 . The table below reflects the life-to-date activity for these awards: Grant Year Group (1) Vesting Period in years Shares awarded Restrictions Lapsed and shares released to participants Shares Withheld for taxes by participants Shares Forfeited by participants (9) Shares Unvested Time Based Awards 2015 Associates (2) 5 190,528 53,574 19,405 19,136 98,413 2015 Leadership team (3) 5 16,605 2,530 788 — 13,287 2016 Associates (2) 5 143,273 19,490 7,316 15,126 101,341 2017 Associates (2) 3 - 5 248,265 388 198 14,085 233,594 2017 Associates (2) (4) 3 - 5 136,890 40,317 — — 96,573 Performance Based Awards 2015 Leadership team (5) 5 43,711 — — — 43,711 2015 Leadership team (6) 3 11,302 2,679 1,086 — 7,537 2016 Leadership team (5) 3 43,694 — — — 43,694 2016 Leadership team (7) 3 15,468 — — — 15,468 2017 Leadership team (5) 3 43,680 — — — 43,680 Outside Director Awards (8) 2015 Outside directors 1 13,069 11,298 1,771 — — 2016 Outside directors 1 18,923 15,471 2,266 1,186 — 2017 Outside directors 1 13,677 2,376 796 — 10,505 (1) Groups include employees (referred to as associates above), the leadership team which includes our named executive officers and other key senior leadership members, and outside directors. When the restricted shares are awarded, a participant receives voting rights and forfeitable dividend rights with respect to the shares, but is not able to transfer the shares until the restrictions have lapsed. Once the restrictions lapse, the participant is taxed on the value of the award and may elect to sell some shares (or have Pinnacle Financial withhold some shares) to pay the applicable income taxes associated with the vested portion of the award. For time-based vesting restricted share awards, dividends paid on shares for which the forfeiture restrictions do not lapse will be recouped by Pinnacle Financial at the time of termination. For performance-based vesting awards, dividends are placed into escrow until the forfeiture restrictions on such shares lapse. (2) The forfeiture restrictions on these restricted share awards lapse in equal annual installments on the anniversary date of the grant. (3) These shares were awarded to individuals joining the leadership team upon acquisition of Magna. The forfeiture restrictions on these restricted share awards lapse in equal installments on the anniversary date of the grant. (4) Restricted share awards issued to associates that were former associates of BNC in connection with the acquisition of BNC. (5) Reflects settlement of restricted share units issued in prior years in restricted share awards. The forfeiture restrictions on these restricted share awards lapse in separate equal installments should Pinnacle Financial achieve certain soundness targets over each year of the subsequent vesting period. Half of the awards include a four-year vesting period while the remainder include a three-year vesting period. (6) These shares were awarded to individuals joining the leadership team upon acquisition of CapitalMark. The forfeiture restrictions on these restricted share awards lapse in separate equal installments should Pinnacle Financial achieve certain earnings targets over each year of the vesting period and should the recipient thereafter remain employed by Pinnacle Financial for a subsequent vesting period. (7) These shares were awarded to individuals joining the leadership team upon acquisition of Avenue. The forfeiture restrictions on these restricted share awards lapse in separate equal installments should Pinnacle Financial achieve certain earnings targets over each year of the vesting period and should the recipient thereafter remain employed by Pinnacle Financial for a subsequent vesting period. (8) Restricted share awards are issued to the outside members of the board of directors in accordance with their board compensation plan. Restrictions lapse on the one year anniversary date of the award based on each individual board member meeting attendance goals for the various board and board committee meetings to which each member was scheduled to attend. (9) These shares represent forfeitures resulting from recipients whose employment or board membership terminated during the year ended December 31, 2017 . Any dividends paid on shares for which the forfeiture restrictions do not lapse will be recouped by Pinnacle Financial at the time of termination or will not be distributed from escrow, as applicable.
Restricted Share Unit Awards Outstanding	Units Awarded Applicable Performance Periods associated with each tranche (fiscal year) Service period per tranche (in years) Subsequent holding period per tranche (in years) Shares settled into RSAs as of period end (2) Grant year Named Executive Officers (NEOs) (1) Leadership Team other than NEOs 2017 72,537-109,339 24,916 2017 2 3 N/A 2018 2 2 N/A 2019 2 1 N/A 2016 73,474-110,223 26,683 2016 2 3 N/A 2017 2 2 N/A 2018 2 1 N/A 2015 58,200-101,850 28,378 2015 2 3 N/A 2016 2 2 N/A 2017 2 1 N/A 2014 (3) 58,404-102,209 29,087 2014 5 N/A 21,856 2014 4 N/A 21,856 2015 4 N/A 21,847 2015 3 N/A 21,847 2016 3 N/A 21,840 2016 2 N/A 21,840 (1) The named executive officers are awarded a range of awards that may be earned based on attainment of goals at a target level of performance to the maximum level of performance. (2) Performance-based vesting restricted stock unit awards granted in 2017 , 2016 and 2015 if earned will be settled in shares of Pinnacle Financial Common Stock. (3) Restrictions on half of the shares issued as restricted share awards in settlement of units will lapse commensurate with the filing of the Form 10-K for the year ended December 31, 2018 and 2019 , respectively, and are reflected as restricted stock awards in the year in which the shares are issued in settlement of the units.
Schedule of Share Based Compensation Expense	A summary of stock compensation expense, net of the impact of income taxes, related to restricted share awards and restricted share units for the three-year period ended December 31, 2017 , follows (in thousands except per share data): 2017 2016 2015 Restricted stock expense $ 19,538 $ 10,971 $ 6,033 Income tax benefit 7,665 4,306 2,368 Restricted stock expense, net of income tax benefit $ 11,873 $ 6,665 $ 3,665 As of the December 31, 2017, the total compensation cost related to unvested restricted share awards and restricted share units not yet recognized was $30.9 million. This expense is expected to be recognized over a weighted-average period of 2.98 years.

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Interest Rate Swaps	A summary of Pinnacle Financial's interest rate swaps to facilitate customer transactions as of December 31, 2017 and December 31, 2016 is included in the following table (in thousands): December 31, 2017 December 31, 2016 Notional Amount Estimated Fair Value Notional Amount Estimated Fair Value Interest rate swap agreements: Pay fixed / receive variable swaps $ 748,625 $ 13,771 $ 666,572 $ 16,004 Pay variable / receive fixed swaps 748,625 (13,866 ) 666,572 (16,138 ) Total $ 1,497,250 $ (95 ) $ 1,333,144 $ (134 )
Schedule of Derivative Instruments	Hedge derivatives Pinnacle Financial has forward cash flow hedge relationships to manage future interest rate exposure. The hedging strategy converts the LIBOR-based variable interest rate on forecasted borrowings to a fixed interest rate and protects Pinnacle Financial from floating interest rate variability. A summary of Pinnacle Financial's cash flow hedge relationships as of December 31, 2017 and 2016 are as follows (in thousands): December 31, 2017 December 31, 2016 Forecasted Notional Amount Receive Rate Pay Rate Term(1) Asset/ (Liabilities) Unrealized Loss in Accumulated Other Comprehensive Income Asset/ (Liabilities) Unrealized Loss in Accumulated Other Comprehensive Income Interest Rate Swap $ 33,000 3 month LIBOR 2.265 % April 2016 - April 2020 (146 ) (89 ) (727 ) (442 ) Interest Rate Swap 33,000 3 month LIBOR 2.646 % April 2016 - April 2022 (647 ) (393 ) (1,304 ) (792 ) Interest Rate Swap 33,000 3 month LIBOR 2.523 % Oct. 2016 - Oct. 2020 (382 ) (232 ) (1,081 ) (657 ) Interest Rate Swap 33,000 3 month LIBOR 2.992 % Oct. 2017 - Oct. 2021 (998 ) (606 ) (1,200 ) (729 ) Interest Rate Swap 34,000 3 month LIBOR 3.118 % April 2018 - July 2022 (1,205 ) (732 ) (1,222 ) (743 ) Interest Rate Swap 34,000 3 month LIBOR 3.158 % July 2018 - Oct. 2022 (1,205 ) (733 ) (1,198 ) (728 ) $ 200,000 (4,583 ) (2,785 ) (6,732 ) (4,091 ) (1) No cash will be exchanged prior to the beginning of the term. Pinnacle Financial has interest rate swap agreements designated as cash flow hedges intended to protect against the variability of cash flows on selected LIBOR-based loans. The swaps hedge the interest rate risk, wherein Pinnacle Financial receives a fixed rate of interest from a counterparty and pays a variable rate, based on one month LIBOR. The swaps were entered into with a counterparty that met Pinnacle Financial's credit standards and the agreements contain collateral provisions protecting the at-risk party. The following outlines the interest rate swap agreements in place at December 31, 2017 and December 31, 2016 (in thousands): December 31, 2017 December 31, 2016 Forecasted Notional Amount Receive Rate Pay Rate Term Asset/ (Liabilities) Unrealized Gain (Loss) in Accumulated Other Comprehensive Income Asset/ (Liabilities) Unrealized Gain (Loss) in Accumulated Other Comprehensive Income Interest Rate Swap (1) $ — 2.090 % 1 month LIBOR July 2014 - July 2021 — — 395 240 Interest Rate Swap (1) — 2.270 % 1 month LIBOR July 2014 - July 2022 — — 610 371 Interest Rate Swap (1) — 2.420 % 1 month LIBOR July 2014 - July 2023 — — 874 531 Interest Rate Swap (1) — 2.500 % 1 month LIBOR July 2014 - July 2024 — — 900 547 Interest Rate Swap (1) — 1.470 % 1 month LIBOR August 2015 - August 2020 — — (75 ) (46 ) $ — — — 2,704 1,643

Fair Value of Financial Instr44

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the financial instruments carried at fair value on a recurring basis as of December 31, 2017 and 2016 , by caption on the consolidated balance sheets and by FASB ASC 820 valuation hierarchy (as described above) (in thousands): December 31, 2017 Total carrying value in the consolidated balance sheet Quoted market prices in an active market (Level 1) Models with significant observable market parameters (Level 2) Models with significant unobservable market parameters (Level 3) Investment securities available-for-sale: U.S. treasury securities $ 30,445 $ — $ 30,445 $ — U.S. government agency securities 180,801 — 180,801 — Mortgage-backed securities 1,263,819 — 1,263,819 — State and municipal securities 784,612 — 767,583 17,029 Asset- backed securities 173,292 — 173,292 — Corporate notes and other 82,314 — 82,314 — Total investment securities available-for-sale 2,515,283 — 2,498,254 17,029 Other investments 28,874 — — 28,874 Other assets 11,812 — 11,812 — Total assets at fair value $ 2,555,969 $ — $ 2,510,066 $ 45,903 Other liabilities $ 13,886 $ — $ 13,886 $ — Total liabilities at fair value $ 13,886 $ — $ 13,886 $ — December 31, 2016 Investment securities available-for-sale: U.S. treasury securities $ 250 $ — $ 250 $ — U.S. government agency securities $ 21,769 $ — $ 21,769 $ — Mortgage-backed securities 976,626 — 976,626 — State and municipal securities 212,720 — 212,720 — Asset- backed securities 78,580 — 78,580 — Corporate notes and other 8,601 — 8,601 — Total investment securities available-for-sale 1,298,546 — 1,298,546 — Other investments 10,478 — — 10,478 Other assets 13,340 — 13,340 — Total assets at fair value $ 1,322,364 $ — $ 1,311,886 $ 10,478 Other liabilities $ 15,758 $ — $ 15,758 $ — Total liabilities at fair value $ 15,758 $ — $ 15,758 $ —
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis	The following table presents assets measured at fair value on a nonrecurring basis as of December 31, 2017 and 2016 (in thousands): December 31, 2017 Total carrying value in the consolidated balance sheet Quoted market prices in an active market (Level 1) Models with significant observable market parameters (Level 2) Models with significant unobservable market parameters (Level 3) Total gains (losses) for the period ended Other real estate owned $ 27,831 $ — $ — $ 27,831 $ 203 Nonaccrual loans, net (1) 55,138 — — 55,138 (722 ) Total $ 82,969 $ — $ — $ 82,969 $ (519 ) December 31, 2016 Other real estate owned $ 6,090 $ — $ — $ 6,090 $ (135 ) Nonaccrual loans, net (1) 26,506 — — 26,506 (7,173 ) Total $ 32,596 $ — $ — $ 32,596 $ (7,308 ) (1) Amount is net of a valuation allowance of $2.3 million and $1.1 million at December 31, 2017 and 2016 , respectively, as required by ASC 310-10, "Receivables."
Rollforward of the Balance Sheet Amounts, Unobservable Input Reconciliation	The table below includes a rollforward of the balance sheet amounts for the year ended December 31, 2017 for financial instruments classified by Pinnacle Financial within Level 3 of the valuation hierarchy measured at fair value on a recurring basis including changes in fair value due in part to observable factors that are part of the valuation methodology (in thousands): For the year ended December 31, 2017 2016 Available-for-sale Securities Other assets Other liabilities Available-for-sale Securities Other assets Other liabilities Fair value, Jan. 1 $ — $ 10,478 $ — $ — $ 9,764 $ — Total net realized losses included in income 66 605 — — 131 — Change in unrealized gains/losses included in other comprehensive income for assets and liabilities still held at Dec. 31 709 — — — — — Acquired 16,254 17,062 — — — — Purchases — 2,330 — — 1,639 — Issuances — — — — — — Settlements — (1,601 ) — — (1,056 ) — Transfers out of Level 3 — — — — — — Fair value, Dec. 31 $ 17,029 $ 28,874 $ — $ — $ 10,478 $ — Total realized losses included in income related to financial assets and liabilities still on the consolidated balance sheet at Dec. 31 $ 66 $ 605 $ — $ — $ 131 $ —
Carrying Amounts, Estimated Fair Value and Placement in the Fair Value Hierarchy of Financial Instruments	The following table presents the carrying amounts, estimated fair value and placement in the fair value hierarchy of Pinnacle Financial's financial instruments at December 31, 2017 and 2016 . This table excludes financial instruments for which the carrying amount approximates fair value. For short-term financial assets such as cash and cash equivalents, the carrying amount is a reasonable estimate of fair value due to the relatively short time between the origination of the instrument and its expected realization. For financial liabilities such as non-interest bearing demand, interest-bearing demand, and savings deposits, the carrying amount is a reasonable estimate of fair value due to these products having no stated maturity. December 31, 2017 Carrying/ Notional Amount Estimated Fair Value (1) Quoted market prices in an active market (Level 1) Models with significant observable market parameters (Level 2) Models with significant unobservable market parameters (Level 3) Financial assets: Securities held-to-maturity $ 20,762 $ 20,830 $ — $ 20,830 $ — Loans, net 15,565,876 15,252,953 — — 15,252,953 Mortgage loans held-for-sale 103,729 104,986 — 104,986 — Commercial loans held-for-sale 25,456 25,761 — 25,761 — Financial liabilities: Deposits and securities sold under agreements to repurchase 16,586,964 16,516,342 — — 16,516,342 Federal Home Loan Bank advances 1,319,909 1,313,311 — — 1,313,311 Subordinated debt and other borrowings 465,505 445,098 — — 445,098 Off-balance sheet instruments: Commitments to extend credit (2) 5,788,425 2,264 — — 2,264 Standby letters of credit (3) 143,684 800 — — 800 December 31, 2017 Carrying/ Notional Amount Estimated Fair Value (1) Quoted market prices in an active market (Level 1) Models with significant observable market parameters (Level 2) Models with significant unobservable market parameters (Level 3) December 31, 2016 Financial assets: Securities held-to-maturity $ 25,251 $ 25,233 $ — $ 25,233 $ — Loans, net 8,390,944 8,178,982 — — 8,178,982 Mortgage loans held-for-sale 47,710 47,892 — 47,892 — Commercial loans held-for-sale 22,588 22,674 — 22,674 — Financial liabilities: Deposits and securities sold under agreements to repurchase 8,845,014 8,579,664 — — 8,579,664 Federal Home Loan Bank advances 406,304 406,491 — — 406,491 Subordinated debt and other borrowings 350,768 328,049 — — 328,049 Off-balance sheet instruments: Commitments to extend credit (2) 3,374,269 383 — — 383 Standby letters of credit (3) 131,418 740 — — 740 (1) Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction. (2) At the end of each period, Pinnacle Financial evaluates the inherent risks of the outstanding off-balance sheet commitments. In making this evaluation, Pinnacle Financial evaluates the credit worthiness of the borrower, the collateral supporting the commitments and any other factors similar to those used to evaluate the inherent risks of our loan portfolio. Additionally, Pinnacle Financial evaluates the probability that the outstanding commitment will eventually become a funded loan. As a result, at both December 31, 2017 and 2016 , respectively, Pinnacle Financial included in other liabilities $2.3 million and $383,000 representing the inherent risks associated with these off-balance sheet commitments. (3) At December 31, 2017 and 2016 , the fair value of Pinnacle Financial's standby letters of credit totaled $800,000 and $740,000 , respectively. This amount represents the unamortized fee associated with these standby letters of credit, which were priced at market when issued, and is included in the consolidated balance sheet of Pinnacle Financial and is believed to approximate fair value. This fair value will decrease over time as the existing standby letters of credit approach their expiration dates.

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2016
Variable Interest Entities [Abstract]
Summary of Variable Interest Entities	December 31, 2017 December 31, 2016 Type Maximum Loss Exposure Liability Recognized Maximum Loss Exposure Liability Recognized Classification Low Income Housing Partnerships $ 23,912 $ — $ 24,150 $ — Other Assets Trust Preferred Issuances N/A 132,995 N/A 82,476 Subordinated Debt Commercial Troubled Debt Restructurings 3,760 — 11,572 — Loans Managed Discretionary Trusts N/A N/A N/A N/A N/A

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2017
Regulatory Capital Requirements [Abstract]
Summary of Regulatory Capital Requirement	The final rules implementing the Basel Committee on Banking Supervision's capital guidelines for U.S. banks (Basel III rules) became effective for Pinnacle Financial on January 1, 2015 with full compliance with all of the requirements being phased in over a multi-year schedule, and fully phased in by January 1, 2019. The minimum capital level requirements applicable to bank holding companies and banks subject to the rules are: (i) a common equity Tier 1 capital ratio of 4.5% ; (ii) a Tier 1 risk-based capital ratio of 6% ; (iii) a total risk-based capital ratio of 8% ; and (iv) a Tier 1 leverage ratio of 4% for all institutions. The Basel III rules, also establish a capital conservation buffer of 2.5% (to be phased in over three years) above the regulatory minimum risk-based capital ratios. The phase-in of the capital conservation buffer requirement commenced in January 2016 at 0.625% of risk-weighted assets and increases each year by a like percentage until fully implemented in January 2019. The net unrealized gain or loss on available-for-sale securities is not included in computing regulatory capital. Management believes, as of December 31, 2017 , that Pinnacle Financial and Pinnacle Bank met all capital adequacy requirements to which they are subject. To be categorized as well-capitalized under applicable banking regulations, Pinnacle Financial and Pinnacle Bank must maintain certain total risk-based, Tier 1 risk-based, common equity Tier 1 and Tier 1 leverage ratios as set forth in the following table and not be subject to a written agreement, order or directive to maintain a higher capital level. The capital conservation buffer is not included in the required ratios of the table presented below. Pinnacle Financial's and Pinnacle Bank's actual capital amounts and ratios are presented in the following table (in thousands): Actual Minimum Capital Requirement Minimum To Be Well-Capitalized Amount Ratio Amount Ratio Amount Ratio December 31, 2017 Total capital to risk weighted assets: Pinnacle Financial $ 2,266,161 12.0 % $ 1,509,496 8.0 % N/A N/A Pinnacle Bank $ 2,134,344 11.3 % $ 1,504,765 8.0 % $ 1,880,956 10.0 % Tier 1 capital to risk weighted assets: Pinnacle Financial $ 1,725,323 9.1 % $ 1,132,122 6.0 % N/A N/A Pinnacle Bank $ 1,936,313 10.3 % $ 1,128,574 6.0 % $ 1,504,765 8.0 % Common equity Tier 1 capital: Pinnacle Financial $ 1,725,219 9.1 % $ 849,092 4.5 % N/A N/A Pinnacle Bank $ 1,936,209 10.3 % $ 846,430 4.5 % $ 1,222,621 6.5 % Tier 1 capital to average assets (*): Pinnacle Financial $ 1,725,323 8.6 % $ 797,861 4.0 % N/A N/A Pinnacle Bank $ 1,936,313 9.7 % $ 796,235 4.0 % $ 995,294 5.0 % December 31, 2016 Total capital to risk weighted assets: Pinnacle Financial $ 1,211,105 11.9 % $ 816,857 8.0 % N/A N/A Pinnacle Bank $ 1,136,782 11.2 % $ 814,254 8.0 % $ 1,017,817 10.0 % Tier 1 capital to risk weighted assets: Pinnacle Financial $ 882,654 8.6 % $ 612,643 6.0 % N/A N/A Pinnacle Bank $ 949,193 9.3 % $ 610,690 6.0 % $ 814,254 8.0 % Common equity Tier 1 capital: Pinnacle Financial $ 802,532 7.9 % $ 459,482 4.5 % N/A N/A Pinnacle Bank $ 949,070 9.3 % $ 458,018 4.5 % $ 661,581 6.5 % Tier 1 capital to average assets (*): Pinnacle Financial $ 882,654 8.6 % $ 412,902 4.0 % N/A N/A Pinnacle Bank $ 949,193 9.2 % $ 412,124 4.0 % $ 515,155 5.0 % (*) Average assets for the above calculations were based on the most recent quarter. Following the Merger with BNC, Pinnacle Financial's total assets exceeded $15.0 billion as a result of the acquisition of BNC, which caused the subordinated debentures Pinnacle Financial and BNC previously issued in connection with the trust preferred securities of their affiliates to cease to qualify as Tier 1 capital under applicable banking regulations. Though these securities no longer qualify as Tier 1 capital, Pinnacle Financial believes these subordinated debentures continue to qualify as Tier 2 capital.

Parent Company Only Financial47

Parent Company Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
CONDENSED BALANCE SHEETS	CONDENSED BALANCE SHEETS 2017 2016 Assets: Cash and cash equivalents $ 64,851 $ 36,984 Investments in bank 3,855,483 1,579,728 Investments in consolidated subsidiaries 6,025 5,484 Investment in unconsolidated subsidiaries: Statutory Trusts 3,995 2,476 Other investments 69,256 61,374 Current income tax receivable 20,017 6,831 Other assets 29,524 29,182 $ 4,049,151 $ 1,722,059 Liabilities and stockholders' equity: Income taxes payable to subsidiaries 24 — Subordinated debt and other borrowings 337,818 223,337 Other liabilities 3,357 2,026 Stockholders' equity 3,707,952 1,496,696 $ 4,049,151 $ 1,722,059
CONDENSED STATEMENTS OF OPERATIONS	CONDENSED STATEMENTS OF OPERATIONS 2017 2016 2015 Revenues: Income from bank subsidiaries $ 63,100 27,663 19,038 Income from nonbank subsidiaries 297 5,198 210 Income from equity method investment 10,126 7,663 — Other income (loss) 380 21 (132 ) Expenses: Interest expense 9,856 1,997 220 Personnel expense, including stock compensation 16,629 10,971 7,342 Other expense 8,076 3,653 2,889 Income before income taxes and equity in undistributed income of subsidiaries 39,342 23,924 8,665 Income tax benefit (12,748 ) (3,428 ) (4,119 ) Income before equity in undistributed income of subsidiaries 52,090 27,352 12,784 Equity in undistributed income of bank subsidiaries 121,341 104,318 81,536 Equity in undistributed income (loss) of nonbank subsidiaries 548 (4,445 ) 1,189 Net income $ 173,979 $ 127,225 $ 95,509
CONDENSED STATEMENTS OF CASH FLOWS	CONDENSED STATEMENTS OF CASH FLOWS 2017 2016 2015 Operating activities : Net income $ 173,979 $ 127,225 $ 95,509 Adjustments to reconcile net income to net cash provided by (used in) operating activities: Amortization and accretion 290 543 — Stock-based compensation expense 19,538 10,971 7,342 Increase in income tax payable, net 24 (12 ) (10,870 ) Deferred tax expense 5,919 1,025 (394 ) Income from equity method investments, net (10,368 ) (8,350 ) — Excess tax benefit from stock compensation (5,365 ) (4,604 ) (4,116 ) Loss (gain) on other investments (350 ) 497 132 Decrease in other assets (3,989 ) 2,636 1,194 Increase in other liabilities (9,194 ) 3,157 3,771 Equity in undistributed income of bank subsidiaries (121,341 ) (104,318 ) (81,530 ) Equity in undistributed income of nonbank subsidiaries (548 ) 4,445 (1,189 ) Net cash provided by operating activities 48,595 33,215 9,849 Investing activities : Investment in consolidated banking subsidiaries (182,288 ) (118,878 ) — Increase in equity method investment — (11,400 ) — Dividends received from equity method investment 5,655 3,255 — Increase in other investments (815 ) (710 ) (335 ) Net cash used in investing activities (177,448 ) (127,733 ) (335 ) Financing activities : Net (decrease) increase in subordinated debt and other borrowings (60 ) 118,294 (13,682 ) Proceeds from common stock issuance 192,194 — — Exercise of common stock options and stock appreciation rights, net of repurchase of restricted shares 493 11,589 3,603 Excess tax benefit from stock compensation — 4,604 4,116 Common dividends paid (35,907 ) (24,725 ) (18,307 ) Net cash provided by (used in) financing activities 156,720 109,762 (24,270 ) Net increase (decrease) in cash 27,867 15,244 (14,756 ) Cash and cash equivalents, beginning of year 36,984 21,740 36,496 Cash and cash equivalents, end of year $ 64,851 $ 36,984 $ 21,740

Quarterly Financial Results (48

Quarterly Financial Results (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Summary of Selected Consolidated Quarterly Financial Data	A summary of selected consolidated quarterly financial data for each of the years in the three-year period ended December 31, 2017 follows: (in thousands, except per share data) First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Interest income $ 102,143 $ 123,743 $ 202,167 $ 208,085 Net interest income 88,767 106,627 173,182 174,731 Provision for loan losses 3,651 6,812 6,920 6,281 Net income before taxes 53,444 63,074 99,503 81,965 Net income 39,653 43,086 64,442 26,798 Basic net income per share $ 0.83 $ 0.81 $ 0.84 $ 0.35 Diluted net income per share $ 0.82 $ 0.80 $ 0.83 $ 0.35 2016 Interest income $ 80,974 $ 83,762 $ 97,380 $ 101,493 Net interest income 73,902 75,044 86,635 89,413 Provision for loan losses 3,894 5,280 6,108 3,046 Net income before taxes 41,800 46,546 48,693 54,345 Net income 27,964 30,787 32,377 36,097 Basic net income per share $ 0.70 $ 0.75 $ 0.71 $ 0.79 Diluted net income per share $ 0.68 $ 0.73 $ 0.71 $ 0.78 2015 Interest income $ 54,679 $ 55,503 $ 67,192 $ 77,797 Net interest income 51,269 51,831 62,059 71,475 Provision for loan losses 315 1,186 2,228 5,459 Net income before taxes 32,617 33,917 36,134 40,432 Net income 21,843 22,665 24,149 26,854 Basic net income per share $ 0.62 $ 0.65 $ 0.64 $ 0.67 Diluted net income per share $ 0.62 $ 0.64 $ 0.62 $ 0.65

Summary of Significant Accoun49

Summary of Significant Accounting Policies (Details)	3 Months Ended												12 Months Ended
	Dec. 31, 2017USD ($)$ / shares	Sep. 30, 2017$ / shares	Jun. 30, 2017$ / shares	Mar. 31, 2017USD ($)$ / shares	Dec. 31, 2016USD ($)$ / shares	Sep. 30, 2016$ / shares	Jun. 30, 2016$ / shares	Mar. 31, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)$ / sharesshares	Sep. 30, 2015$ / shares	Jun. 30, 2015$ / shares	Mar. 31, 2015$ / shares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014shares	Dec. 31, 2017USD ($)	Dec. 31, 2017market	Dec. 31, 2017Rate	Dec. 31, 2017shares	Dec. 31, 2016USD ($)shares
Schedule of Equity Method Investments [Line Items]
Deferred tax asset/liability revaluation													$ 31,485,672	$ 0	$ 0
Number of Markets in Which Entity Operates | market																		11
Goodwill [Roll Forward]
Balance at December 31, 2016				$ 551,593,796									551,593,796
Goodwill, Acquired During Period													1,256,455,000
Goodwill, Purchase Accounting Adjustments													0
Goodwill, Other Increase (Decrease)													(47,000)
Balance at December 31, 2017	$ 1,808,001,781				$ 551,593,796								1,808,001,781	551,593,796
Finite-lived Intangible Assets [Roll Forward]
Balance at December 31, 2016				15,104,000									15,104,000
Acquisitions													50,422,000
Amortization													(8,815,609)	(4,281,459)	(1,973,953)
Change in purchase price allocation of previous acquisitions													0
Other changes													0
Balance at December 31, 2017	56,710,391				15,104,000								56,710,391	15,104,000
Balance at December 31, 2016				566,697,796									566,697,796
Acquisitions													1,306,877,000
Amortization													(8,815,609)
Change in purchase price allocation of previous acquisitions													0
Other changes													(47,000)
Balance at December 31, 2017	1,864,712,172				566,697,796								1,864,712,172	566,697,796
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross																	$ 92,787,000				$ 42,365,000
Accumulated amortization																	(36,077,000)				(27,261,000)
Net book value	$ 56,710,391			$ 15,104,000	$ 15,104,000								$ 15,104,000	15,104,000			56,710,391				15,104,000
Cash Equivalents and Cash Flows [Abstract]
Cash equivalents maturity period													90 days
Cash Payments [Abstract]
Interest													$ 91,628,041	37,002,870	17,435,292
Income taxes paid													81,538,510	49,503,637	45,715,968
Noncash Transactions [Abstract]
Loans charged-off to the allowance for loan losses													(22,046,511)	(31,112,118)	(21,148,034)
Real Estate Owned, Transfer to Real Estate Owned													6,227,509	4,453,060	341,342
Loans foreclosed upon with repossessions transferred to other repossessed assets													645,737	1,842,318	8,259,368
Other real estate sales financed													907,931	0	0
Common stock issued in connection with acquisitions													$ 1,850,968,026	222,162,640	269,492,990
Loans [Abstract]
Number of loan segments													5
Net deferred loan fees													$ 7,800,000	7,600,000
Percentage of loan portfolio assigned specific risk rating	81.40%												81.40%
Premises and Equipment and Leaseholds [Abstract]
Deferred liability associated with escalating rentals																	3,500,000
Other Assets [Abstract]
Premises and equipment, net																	266,013,608				88,904,145
Amortization													$ 2,500,000	2,300,000	1,300,000
Cash surrender value of life insurance																	415,900,000				150,600,000
Noninterest income related to cash surrender value of bank owned life insurance policies													7,900,000	3,500,000	2,500,000
investments are included in CRA investments																	23,900,000				18,900,000
Investments as per community reinvestment act																	44,000,000				43,100,000
Variable Interest Entity [Line Items]
Federal Reserve Bank and Federal Home Loan Bank (FHLB) stock																	46,400,000				31,400,000
Investments in other entities at fair value																	24,400,000				8,300,000
Gain (loss) due to change in fair value of investments													$ (552,310)	(233,000)
Number of trusts investment	12												12
Value of investments with trust companies																	221,667,490				205,359,844
Other Real Estate Owned [Abstract]
Other real estate owned																	29,100,000				6,500,000
Valuation allowance related to other real estate owned																	1,224,066				400,000
Foreclosed real estate expense													$ 1,079,000	$ 396,000	(306,000)
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued									$ (96,000)						$ (96,000)		0				$ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options outstanding (in shares) | shares									1,251,601						1,251,601	698,488				274,586	550,490
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | shares													567,611	694,909	958,320
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares													0
Basic earnings per share calculation [Abstract]
Numerator - Net income (loss) available to common stockholders													$ 173,979,487	$ 127,224,695	$ 95,509,402
Denominator - Weighted average common shares outstanding (in shares) | shares													63,760,578	43,037,083	37,015,468
Basic net income per common share (in dollars per share) | $ / shares	$ 0.35	$ 0.84	$ 0.81	$ 0.83	$ 0.79	$ 0.71	$ 0.75	$ 0.70	$ 0.67	$ 0.64	$ 0.65	$ 0.62	$ 2.73	$ 2.96	$ 2.58
Diluted net income per share calculation [Abstract]
Numerator - Net income (loss) available to common stockholders													$ 173,979,487	$ 127,224,695	$ 95,509,402
Denominator - Weighted average common shares outstanding (in shares) | shares													63,760,578	43,037,083	37,015,468
Dilutive shares (in shares) | shares													567,611	694,909	958,320
Weighted average diluted common shares outstanding (in shares) | shares													64,328,189	43,731,992	37,973,788
Diluted net income per common share (in dollars per share) | $ / shares	$ 0.35	$ 0.83	$ 0.80	$ 0.82	$ 0.78	$ 0.71	$ 0.73	$ 0.68	$ 0.65	$ 0.62	$ 0.64	$ 0.62	$ 2.70	$ 2.91	$ 2.52
Mortgage Servicing Rights [Abstract]
Servicing Asset at Amortized Cost									$ 6,412,000						$ 6,412,000
Mortgage servicing rights associated with Fannie Mae portfolio								$ 830,000,000
Proceeds from sale of mortgage servicing rights								6,600,000					$ 0	$ 6,747,626	$ 0
Income Recorded from Sale of Mortgage Servicing Portfolio								$ 241,000						241,000
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Value of investments with trust companies																	3,995,000
Small Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Principal balance of loans subject to individual determination of impairment																	500,000
Premises and Equipment [Member] | Minimum
Premises and Equipment and Leaseholds [Abstract]
Premises and equipment, useful life													3 years
Premises and Equipment [Member] | Maximum
Premises and Equipment and Leaseholds [Abstract]
Premises and equipment, useful life													30 years
Computer Software, Intangible Asset [Member]
Other Assets [Abstract]
Premises and equipment, net																	$ 9,300,000				$ 5,700,000
Computer Software, Intangible Asset [Member] | Minimum
Premises and Equipment and Leaseholds [Abstract]
Premises and equipment, useful life													3 years
Computer Software, Intangible Asset [Member] | Maximum
Premises and Equipment and Leaseholds [Abstract]
Premises and equipment, useful life													7 years
Bankers Healthcare Group, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.00%												49.00%						49.00%
Finite-lived Intangible Assets [Roll Forward]
Amortization													$ (3,300,000)	$ (3,400,000)
Internal Revenue Service (IRS) [Member] | Minimum
Income Tax Contingency [Line Items]
Tax year open to audit under the statute of limitation																2,014
Internal Revenue Service (IRS) [Member] | Maximum
Income Tax Contingency [Line Items]
Tax year open to audit under the statute of limitation													2,017
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options outstanding (in shares) | shares																				274,586
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction in tax expense due to ASU 2016-09													$ 5,400,000

Acquisitions Acquisitions - Con

Acquisitions Acquisitions - Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details) - USD ($)	Jun. 16, 2017	Mar. 01, 2016	Feb. 01, 2015	Dec. 31, 2017	Dec. 31, 2016
Equity consideration:
Common stock issued (in shares)		860,470
Non-equity consideration:
Cash paid to redeem common stock		$ 74,100,000	$ 75,000,000
Allocation of total consideration paid:
Goodwill				$ 1,808,001,781	$ 551,593,796
Bank of North Carolina [Member]
Equity consideration:
Total equity consideration	$ 1,858,133,000
Non-equity consideration:
Cash paid to redeem common stock	129,000
Allocation of total consideration paid:
Fair value of net assets assumed including estimated identifiable intangible assets	601,807,000
Goodwill	1,256,455,000
Total consideration paid	$ 1,858,262,000
Bank of North Carolina [Member] | Common Stock [Member]
Equity consideration:
Common stock issued (in shares)	27,687,100
Total equity consideration	$ 1,858,133,000

Acquisitions Acquisitions - Net

Acquisitions Acquisitions - Net Assets Acquired (Details) - Bank of North Carolina [Member] $ in Thousands	Jun. 16, 2017USD ($)
Assets [Abstract]
Cash and Cash Equivalents	$ 155,271
Investment securities	645,542
Loans, net of allowance for loan losses	5,601,290
Mortgage loans held for sale	27,026
Other real estate owned	20,743
Core deposit intangible	50,422
Property, Plant, and Equipment	153,424
Other assets	374,985
Total Assets	7,028,703
Liabilities [Abstract]
Interest-bearing deposits	5,008,008
Non-interest bearing deposits	1,199,342
Borrowings	176,977
Other liabilities	42,569
Total Liabilities	6,426,896
Fair value of net assets assumed including estimated identifiable intangible assets	601,807
Historical Cost Basis
Assets [Abstract]
Cash and Cash Equivalents	155,271
Investment securities	643,875
Loans, net of allowance for loan losses	5,782,720
Mortgage loans held for sale	27,026
Other real estate owned	20,143
Core deposit intangible	0
Property, Plant, and Equipment	156,805
Other assets	320,988
Total Assets	7,106,828
Liabilities [Abstract]
Interest-bearing deposits	5,003,653
Non-interest bearing deposits	1,199,342
Borrowings	183,389
Other liabilities	35,729
Total Liabilities	6,422,113
Fair value of net assets assumed including estimated identifiable intangible assets	684,715
Fair Value Adjustments
Assets [Abstract]
Cash and Cash Equivalents	0
Investment securities	1,667
Loans, net of allowance for loan losses	(181,430)
Mortgage loans held for sale	0
Other real estate owned	600
Core deposit intangible	50,422
Property, Plant, and Equipment	(3,381)
Other assets	53,997
Total Assets	(78,125)
Liabilities [Abstract]
Interest-bearing deposits	4,355
Non-interest bearing deposits	0
Borrowings	(6,412)
Other liabilities	6,840
Total Liabilities	4,783
Fair value of net assets assumed including estimated identifiable intangible assets	$ (82,908)

Acquisitions Acquisitions - Nar

Acquisitions Acquisitions - Narrative (Details) $ in Millions	Jun. 16, 2017USD ($)
Bank of North Carolina [Member]
Business Acquisition [Line Items]
Transaction Costs	$ 7.2

Acquisitions Acquisitions - Sup

Acquisitions Acquisitions - Supplemental Pro Forma Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Revenue	$ 844,896,000	$ 707,126,000
Income Before Income Taxes	$ 347,983,000	$ 275,635,000

Equity method investment Equity

Equity method investment Equity method investment - Financial Position and Results of Operations (Details) - Bankers Healthcare Group, LLC [Member] - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Assets	$ 330,030,000	$ 223,246,000
Liabilities	224,837,000	139,531,000
Equity interests	105,193,000	83,715,000
Total liabilities and equity interests	330,030,000	223,246,000
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Revenues	160,209,000	136,693,000
Net income, pre tax	$ 77,941,000	$ 67,135,000

Equity method investment (Detai

Equity method investment (Details)	Mar. 01, 2016USD ($)Rateshares	Feb. 01, 2015USD ($)Rate	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2017Rate
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Businesses, Gross	$ 74,100,000	$ 75,000,000
Common stock issued in the purchase agreement (in shares) | shares	860,470
Core deposits and other intangible assets				$ 15,104,038		$ 56,710,268
Amortization of intangibles			$ 8,815,609	4,281,459	$ 1,973,953
Dividends received from equity method investment			$ 21,650,046	28,982,009	$ 7,152,000
Bankers Healthcare Group, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage			49.00%				49.00%
Additional ownership percentage | Rate	19.00%
Number of board of managers designated by bank	2
Number of board managers	5
Period of which non consent of manager approves the sale	4 years
Period of inability of members to transfer of ownership interest	5 years
Core deposits and other intangible assets				16,800,000		$ 13,400,000
Amortization of intangibles			$ 3,300,000	3,400,000
Accretion income			3,100,000	2,500,000
Accretable discount			10,300,000	13,400,000
Dividends received from equity method investment			$ 21,700,000	$ 29,000,000
Bankers Healthcare Group, LLC [Member] | Pinnacle Financial [Member]
Schedule of Equity Method Investments [Line Items]
Additional ownership percentage | Rate	8.55%
Bankers Healthcare Group, LLC [Member] | Pinnacle Bank [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage | Rate		30.00%
Additional ownership percentage | Rate	10.45%

Restricted Cash Balances (Detai

Restricted Cash Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Abstract]
Average Daily Cash Balance with Federal Reserve Bank	$ 229,900	$ 183,100

Securities Securities - Availab

Securities Securities - Available for sale (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities [Abstract]
Amortized Cost	$ 2,513,540,000	$ 1,310,071,000
Gross Unrealized Gain	19,244,000	8,557,000
Gross Unrealized Loss	17,501,000	20,082,000
Securities available-for-sale, at fair value	2,515,283,219	1,298,546,056
Available-for-sale, Amortized Cost
Due in one year of less	33,251,000
Due in one year to five years	65,214,000
Due in five to ten years	185,337,000
Due after ten years	785,767,000
Mortgage-backed securities	1,270,625,000
Asset-backed securities	173,346,000
Amortized Cost	2,513,540,000
Available-for-sale, Fair Value
Due in one year or less	33,196,000
Due in one year to five years	65,775,000
Due in five years to ten years	187,198,000
Due after ten years	792,003,000
Mortgage-backed securities	1,263,819,000
Asset-backed securities	173,292,000
Securities available-for-sale, at fair value	2,515,283,219	1,298,546,056
State and Municipal Securities
Available-for-sale Securities [Abstract]
Amortized Cost	774,949,000	211,581,000
Gross Unrealized Gain	12,251,000	4,103,000
Gross Unrealized Loss	2,588,000	2,964,000
Securities available-for-sale, at fair value	784,612,000	212,720,000
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	784,612,000	212,720,000
U.S. Government Agency Securities
Available-for-sale Securities [Abstract]
Amortized Cost	182,500,000	22,306,000
Gross Unrealized Gain	67,000	0
Gross Unrealized Loss	1,766,000	537,000
Securities available-for-sale, at fair value	180,801,000	21,769,000
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	180,801,000	21,769,000
Mortgage-backed Agency Securities
Available-for-sale Securities [Abstract]
Amortized Cost	1,270,625,000	988,008,000
Gross Unrealized Gain	5,318,000	4,304,000
Gross Unrealized Loss	12,124,000	15,686,000
Securities available-for-sale, at fair value	1,263,819,000	976,626,000
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	1,263,819,000	976,626,000
US Treasury Securities
Available-for-sale Securities [Abstract]
Amortized Cost	30,505,000	250,000
Gross Unrealized Gain	0	0
Gross Unrealized Loss	60,000	0
Securities available-for-sale, at fair value	30,445,000	250,000
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	30,445,000	250,000
Asset-backed Securities
Available-for-sale Securities [Abstract]
Amortized Cost	173,346,000	79,318,000
Gross Unrealized Gain	262,000	111,000
Gross Unrealized Loss	316,000	849,000
Securities available-for-sale, at fair value	173,292,000	78,580,000
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	173,292,000	78,580,000
Corporate Notes
Available-for-sale Securities [Abstract]
Amortized Cost	81,615,000	8,608,000
Gross Unrealized Gain	1,346,000	39,000
Gross Unrealized Loss	647,000	46,000
Securities available-for-sale, at fair value	82,314,000	8,601,000
Available-for-sale, Fair Value
Securities available-for-sale, at fair value	$ 82,314,000	$ 8,601,000

Securities Securities - Amortiz

Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Held-to-maturity Securities [Abstract]
Amortized cost	$ 20,762,303	$ 25,251,316
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	114,000	87,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	46,000	105,000
Fair Value	20,829,978	25,233,254
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Due in one year or less	1,329,000
Due in one year to five years	6,210,000
Due in five to ten years	10,425,000
Due after ten years	2,798,000
Mortgage-backed securities	0
Asset-backed securities	0
Amortized cost	20,762,303	25,251,316
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less	1,330,000
Due in one year to five years	6,200,000
Due in five to ten years	10,469,000
Due after ten years	2,831,000
Mortgage-backed securities	0
Asset-backed securities	0
Fair Value	20,829,978	25,233,254
State And Municipal Securities
Held-to-maturity Securities [Abstract]
Amortized cost	20,762,000	25,251,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	114,000	87,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	46,000	105,000
Fair Value	20,830,000	25,233,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Amortized cost	20,762,000	25,251,000
Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value	$ 20,830,000	$ 25,233,000

Securities (Details)

Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale of Available-for-sale Securities	$ 363,898,141	$ 72,829,440	$ 189,029,458
Investment gains on sales	(8,264,639)	$ 395,186	$ 552,063
Securities Pledged as Collateral [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral to secure public funds and other deposits or securities sold under agreements to repurchase	1,100,000,000
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement	$ 135,300,000

Securities Securities - Unreali

Securities Securities - Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 17,547	$ 20,187
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	1,017,346	907,810
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	9,021	18,219
Investments with an Unrealized Loss of 12 months or longer, Fair Value	361,724	98,377
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	8,526	1,968
Total Investments with an Unrealized Loss, Fair Value	1,379,070	1,006,187
US Treasury Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	60	0
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	29,948	0
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	60	0
Investments with an Unrealized Loss of 12 months or longer, Fair Value	0	0
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	0	0
Total Investments with an Unrealized Loss, Fair Value	29,948	0
U.S. Government Agency Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,766	537
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	173,677	0
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	1,766	0
Investments with an Unrealized Loss of 12 months or longer, Fair Value	0	20,820
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	0	537
Total Investments with an Unrealized Loss, Fair Value	173,677	20,820
Mortgage-backed Agency Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	12,124	15,686
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	607,408	801,213
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	5,042	15,073
Investments with an Unrealized Loss of 12 months or longer, Fair Value	285,561	43,148
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	7,082	613
Total Investments with an Unrealized Loss, Fair Value	892,969	844,361
State and Municipal Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2,634	3,069
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	115,403	87,277
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	1,408	3,068
Investments with an Unrealized Loss of 12 months or longer, Fair Value	50,083	312
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	1,226	1
Total Investments with an Unrealized Loss, Fair Value	165,486	87,589
Asset-backed Securities
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	316	849
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	68,742	14,510
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	198	32
Investments with an Unrealized Loss of 12 months or longer, Fair Value	14,136	34,097
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	118	817
Total Investments with an Unrealized Loss, Fair Value	82,878	48,607
Corporate Notes
Schedule of Investment Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	647	46
Investment securities, continuous unrealized loss position [Abstract]
Investments with an Unrealized Loss of less than 12 months, Fair Value	22,168	4,810
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses	547	46
Investments with an Unrealized Loss of 12 months or longer, Fair Value	11,944	0
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses	100	0
Total Investments with an Unrealized Loss, Fair Value	$ 34,112	$ 4,810

Loans and Allowance for Loan 61

Loans and Allowance for Loan Losses Loan Classification by Risk Rating Category (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Percentage of loan portfolio as commercial loan	81.40%
Risk rated loans	$ 1,000,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	15,633,116,029	$ 8,449,924,736	$ 6,543,235,000
Potential problem loans not included in nonperforming assets	164,000,000	114,600,000
Average balance of nonaccrual loans	65,974,000	35,058,000	21,613,000
Interest Lost on Nonaccrual Loans	2,700,000	2,100,000	2,300,000
Loans and other extensions of credit granted to directors, executive officers, and their related entities	26,400,000	22,600,000
Amount drawn from loans and other extensions of credit granted	16,100,000	14,800,000
Mortgage loans held-for-sale	103,728,658	47,710,120
Gains on mortgage loans sold, net	18,624,621	15,754,473	7,668,960
Mortgage loans held for sale sold	1,090,489,558	803,498,453	519,134,000
Troubled Debt Restructurings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,600,000	15,000,000
Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	57,500,000	27,600,000
Pass [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	15,237,775,000	8,242,805,000
Special Mention [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	168,713,000	52,464,000
Substandard [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	169,173,000	127,079,000
Substandard [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	57,455,000	27,574,000
Doubtful [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	3,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,669,610,000	3,193,496,000	2,275,483,000
Commercial Real Estate [Member] | Pass [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,487,368,000	3,137,452,000
Commercial Real Estate [Member] | Special Mention [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	94,134,000	21,449,000
Commercial Real Estate [Member] | Substandard [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	72,044,000	29,674,000
Commercial Real Estate [Member] | Substandard [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	16,064,000	4,921,000
Commercial Real Estate [Member] | Doubtful [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,561,214,000	1,185,917,000	1,046,517,000
Residential Mortgage [Member] | Pass [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,503,688,000	1,160,361,000
Residential Mortgage [Member] | Special Mention [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,356,000	1,856,000
Residential Mortgage [Member] | Substandard [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	21,053,000	15,627,000
Residential Mortgage [Member] | Substandard [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,117,000	8,073,000
Residential Mortgage [Member] | Doubtful [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,908,288,000	912,673,000	747,697,000
Construction and Land Development [Member] | Pass [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,880,704,000	897,556,000
Construction and Land Development [Member] | Special Mention [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,148,000	2,716,000
Construction and Land Development [Member] | Substandard [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	13,468,000	5,788,000
Construction and Land Development [Member] | Substandard [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,968,000	6,613,000
Construction and Land Development [Member] | Doubtful [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	0
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,141,341,000	2,891,710,000	2,228,542,000
Commercial and Industrial [Member] | Pass [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,014,656,000	2,782,713,000
Commercial and Industrial [Member] | Special Mention [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	46,898,000	25,641,000
Commercial and Industrial [Member] | Substandard [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	62,529,000	75,861,000
Commercial and Industrial [Member] | Substandard [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	17,258,000	7,492,000
Commercial and Industrial [Member] | Doubtful [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0	3,000
Consumer and Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	352,663,000	266,129,000	$ 244,996,000
Consumer and Other [Member] | Pass [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	351,359,000	264,723,000
Consumer and Other [Member] | Special Mention [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,177,000	802,000
Consumer and Other [Member] | Substandard [Member] | Accruing Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	79,000	129,000
Consumer and Other [Member] | Substandard [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	48,000	475,000
Consumer and Other [Member] | Doubtful [Member] | Nonaccrual Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0	$ 0

Loans and Allowance for Loan 62

Loans and Allowance for Loan Losses - Rollforward of Purchase Credit Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Gross Carrying Value
Gross carrying value, beginning balance	$ 12,468	$ 16,274
Acquisitions	80,812	1,359
Year-to-date settlements	18,956	5,165
Gross carrying value, ending balance	74,324	12,468
Accretable Yield
Accretable yield, beginning balance	0	0
Acquisitions	(196)	0
Year-to-date settlements	64	0
Accretable yield, ending balance	(132)	0
Nonaccretable Yield
Nonaccretable yield, beginning balance	(3,633)	(4,143)
Acquisitions	(32,314)	(812)
Year-to-date settlements	4,410	1,322
Nonaccretable yield, ending balance	(31,537)	(3,633)
Net Carrying Value
Net carrying value, beginning balance	8,835	12,131
Acquisitions	48,302	547
Year-to-date settlements	14,482	3,843
Net carrying value, ending balance	$ 42,655	$ 8,835

Loans and Allowance for Loan 63

Loans and Allowance for Loan Losses, Impaired Financing Receivable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 57,455,000	$ 27,577,000	$ 29,359,000
Unpaid principal balance	70,787,000	31,612,000	34,441,000
Related allowance	2,317,000	1,071,000	3,669,000
Average balance of nonaccrual loans	65,974,000	35,058,000	21,613,000
Interest income recognized	95,000	159,000	308,000
Collateral Dependent Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	31,533,000	14,689,000	18,958,000
Unpaid principal balance	44,746,000	14,769,000	22,935,000
Related allowance	521,000	0	0
Average balance of nonaccrual loans	33,970,000	17,420,000	11,164,000
Interest income recognized	95,000	159,000	308,000
Collateral Dependent Impaired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	13,570,000	2,308,000	4,411,000
Unpaid principal balance	16,631,000	2,312,000	5,659,000
Related allowance	38,000	0	0
Average balance of nonaccrual loans	13,839,000	2,540,000	2,253,000
Interest income recognized	0	0	0
Collateral Dependent Impaired Loans [Member] | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	10,093,000	2,880,000	5,596,000
Unpaid principal balance	14,309,000	2,915,000	6,242,000
Related allowance	115,000	0	0
Average balance of nonaccrual loans	11,216,000	2,907,000	3,067,000
Interest income recognized	0	0	0
Collateral Dependent Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	5,735,000	3,128,000	7,531,000
Unpaid principal balance	10,273,000	3,135,000	7,883,000
Related allowance	6,000	0	0
Average balance of nonaccrual loans	5,935,000	3,132,000	4,317,000
Interest income recognized	95,000	159,000	308,000
Collateral Dependent Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,135,000	6,373,000	1,420,000
Unpaid principal balance	3,533,000	6,407,000	3,151,000
Related allowance	362,000	0	0
Average balance of nonaccrual loans	2,980,000	8,841,000	1,527,000
Interest income recognized	0	0	0
Collateral Dependent Impaired Loans [Member] | Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0	0
Unpaid principal balance	0	0	0
Related allowance	0	0	0
Average balance of nonaccrual loans	0	0	0
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	25,922,000	12,888,000	10,401,000
Unpaid principal balance	26,041,000	16,843,000	11,506,000
Related allowance	1,796,000	1,071,000	3,669,000
Average balance of nonaccrual loans	32,004,000	17,638,000	10,449,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,494,000	2,613,000	1,410,000
Unpaid principal balance	2,505,000	3,349,000	1,661,000
Related allowance	95,000	59,000	20,000
Average balance of nonaccrual loans	3,463,000	2,688,000	1,466,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	8,024,000	5,193,000	3,750,000
Unpaid principal balance	8,079,000	5,775,000	4,098,000
Related allowance	411,000	688,000	616,000
Average balance of nonaccrual loans	10,076,000	5,966,000	3,815,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Construction and Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	233,000	3,485,000	76,000
Unpaid principal balance	233,000	4,154,000	125,000
Related allowance	12,000	20,000	12,000
Average balance of nonaccrual loans	438,000	3,476,000	87,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	15,171,000	1,122,000	263,000
Unpaid principal balance	15,224,000	2,714,000	281,000
Related allowance	1,278,000	77,000	19,000
Average balance of nonaccrual loans	18,027,000	2,884,000	168,000
Interest income recognized	0	0	0
Cash Flow Dependent Impaired Loans [Member] | Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	475,000	4,902,000
Unpaid principal balance	0	851,000	5,341,000
Related allowance	0	227,000	3,002,000
Average balance of nonaccrual loans	0	2,624,000	4,913,000
Interest income recognized	$ 0	$ 0	$ 0

Loans and Allowance for Loan 64

Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)	12 Months Ended
	Dec. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)contract	Dec. 31, 2015USD ($)contract
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	3	6	2
Pre Modification Outstanding Recorded Investment	$ 3,782,000	$ 11,084,000	$ 657,000
Post Modification Outstanding Recorded Investment net of related allowance	$ 3,756,000	$ 11,083,000	$ 522,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0
Commercial Real Estate [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	0	0	1
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 223,000
Post Modification Outstanding Recorded Investment net of related allowance	$ 0	$ 0	$ 185,000
Residential Mortgage [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	1	0	0
Pre Modification Outstanding Recorded Investment	$ 6,000	$ 0	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	$ 5,000	$ 0	$ 0
Construction and Land Development [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	0	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	$ 0	$ 0	$ 0
Commercial and Industrial [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	2	6	1
Pre Modification Outstanding Recorded Investment	$ 3,776,000	$ 11,084,000	$ 434,000
Post Modification Outstanding Recorded Investment net of related allowance	$ 3,751,000	$ 11,083,000	$ 337,000
Consumer and Other [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	0	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	$ 0	$ 0	$ 0

Loans and Allowance for Loan 65

Loans and Allowance for Loan Losses - Industry Classification System (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Percentage of credit exposure to risk based capital	25.00%
Lessors of nonresidential buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	$ 2,778,454
Unfunded Commitments	32,497
Total exposure	2,810,951	$ 1,701,853
Lessors of residential buildings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	870,777
Unfunded Commitments	13,467
Total exposure	884,244	874,234
Hotels and motels
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding Principal Balances	627,126
Unfunded Commitments	1,865
Total exposure	$ 628,991	$ 291,865

Loans and Allowance for Loan 66

Loans and Allowance for Loan Losses, Financing Receivables Past Due (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 15,633,116,029	$ 8,449,924,736	$ 6,543,235,000
Nonaccrual	41,519,000	18,740,000
Currently performing impaired loans	45,800,000	16,700,000
Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	26,719,000	0
Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	60,158,000	22,330,000
30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	56,019,000	21,196,000
90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,139,000	1,134,000
Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	15,488,784,000	8,400,018,000
Total Loans	15,633,116,000	8,449,925,000
Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	15,936,000	8,837,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,669,610,000	3,193,496,000	2,275,483,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	11,395,000	2,297,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,820,000	0
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,876,000	3,505,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,772,000	3,505,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	104,000	0
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,435,819,000	1,347,134,000
Total Loans	2,460,015,000	1,354,893,000
Commercial Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,105,000	1,957,000
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	704,000	239,000
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	12,018,000	0
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16,559,000	0
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16,559,000	0
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,177,454,000	1,837,936,000
Total Loans	4,209,595,000	1,838,603,000
Commercial Real Estate [Member] | Commercial Real Estate All Other [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,860,000	428,000
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,561,214,000	1,185,917,000	1,046,517,000
Nonaccrual	9,320,000	5,553,000
Residential Mortgage [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	5,249,000	0
Residential Mortgage [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	16,100,000	3,891,000
Residential Mortgage [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	14,835,000	3,838,000
Residential Mortgage [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,265,000	53,000
Residential Mortgage [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	2,521,748,000	1,173,953,000
Total Loans	2,561,214,000	1,185,917,000
Residential Mortgage [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	8,797,000	2,520,000
Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,908,288,000	912,673,000	747,697,000
Nonaccrual	2,878,000	3,205,000
Construction and Land Development [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	3,478,000	0
Construction and Land Development [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,282,000	2,210,000
Construction and Land Development [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,136,000	2,210,000
Construction and Land Development [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	146,000	0
Construction and Land Development [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,894,560,000	903,850,000
Total Loans	1,908,288,000	912,673,000
Construction and Land Development [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,090,000	3,408,000
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,141,341,000	2,891,710,000	2,228,542,000
Nonaccrual	17,222,000	6,971,000
Commercial and Industrial [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,154,000	0
Commercial and Industrial [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	8,754,000	4,475,000
Commercial and Industrial [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,406,000	4,475,000
Commercial and Industrial [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,348,000	0
Commercial and Industrial [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	4,114,127,000	2,879,740,000
Total Loans	4,141,341,000	2,891,710,000
Commercial and Industrial [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	84,000	524,000
Consumer and Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	352,663,000	266,129,000	$ 244,996,000
Nonaccrual	0	475,000
Consumer and Other [Member] | Purchase credit impaired, accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	0	0
Consumer and Other [Member] | Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	7,587,000	8,249,000
Consumer and Other [Member] | 30-89 Days Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	6,311,000	7,168,000
Consumer and Other [Member] | 90 Days or More Past Due and Accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	1,276,000	1,081,000
Consumer and Other [Member] | Current and accruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	345,076,000	257,405,000
Total Loans	352,663,000	266,129,000
Consumer and Other [Member] | Current and accruing | Purchase credit impaired, nonaccruing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 0	$ 0

Loans and Allowance for Loan 67

Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance				$ 58,980,000				$ 65,432,000				$ 67,359,000	$ 58,980,000	$ 65,432,000	$ 67,359,000
Charged-off loans													(22,046,511)	(31,112,118)	(21,148,034)
Recovery of previously charged-off loans													6,642,000	6,332,000	10,033,000
Provision for loan losses	$ 6,281,000	$ 6,920,000	$ 6,812,000	3,651,000	$ 3,046,000	$ 6,108,000	$ 5,280,000	3,894,000	$ 5,459,000	$ 2,228,000	$ 1,186,000	315,000	23,663,944	18,328,058	9,188,497
Ending Balance	67,240,000				58,980,000				65,432,000				67,240,000	58,980,000	65,432,000
Collectively Evaluated for Impairment	63,147,000				57,014,000				59,730,000				63,147,000	57,014,000	59,730,000
Individually Evaluated for Impairment	2,198,000				1,092,000				5,165,000				2,198,000	1,092,000	5,165,000
Ending Balance	67,240,000				58,980,000				65,432,000				67,240,000	58,980,000	65,432,000
Collectively Evaluated for Impairment	15,531,482,000				8,407,338,000				6,505,788,000				15,531,482,000	8,407,338,000	6,505,788,000
Individually Evaluated for Impairment	58,979,000				33,750,000				25,313,000				58,979,000	33,750,000	25,313,000
Loans acquired with deteriorated credit quality	42,655,000				8,837,000				12,134,000				42,655,000	8,837,000	12,134,000
Loans	15,633,116,029				8,449,924,736				6,543,235,000				15,633,116,029	8,449,924,736	6,543,235,000
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Individually Evaluated for Impairment	573,000				0				0				573,000	0	0
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance				13,655,000				15,513,000				22,202,000	13,655,000	15,513,000	22,202,000
Charged-off loans													(633,000)	(276,000)	(384,000)
Recovery of previously charged-off loans													671,000	208,000	85,000
Provision for loan losses													7,495,000	(1,790,000)	(6,390,000)
Ending Balance	21,188,000				13,655,000				15,513,000				21,188,000	13,655,000	15,513,000
Collectively Evaluated for Impairment	20,753,000				13,595,000				15,452,000				20,753,000	13,595,000	15,452,000
Individually Evaluated for Impairment	95,000				60,000				61,000				95,000	60,000	61,000
Ending Balance	21,188,000				13,655,000				15,513,000				21,188,000	13,655,000	15,513,000
Collectively Evaluated for Impairment	6,630,593,000				3,188,361,000				2,269,439,000				6,630,593,000	3,188,361,000	2,269,439,000
Individually Evaluated for Impairment	18,214,000				2,750,000				2,420,000				18,214,000	2,750,000	2,420,000
Loans acquired with deteriorated credit quality	20,803,000				2,385,000				3,624,000				20,803,000	2,385,000	3,624,000
Loans	6,669,610,000				3,193,496,000				2,275,483,000				6,669,610,000	3,193,496,000	2,275,483,000
Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Individually Evaluated for Impairment	340,000				0				0				340,000	0	0
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance				6,564,000				7,220,000				5,424,000	6,564,000	7,220,000	5,424,000
Charged-off loans													(1,461,000)	(788,000)	(365,000)
Recovery of previously charged-off loans													1,516,000	546,000	874,000
Provision for loan losses													(1,588,000)	(414,000)	1,287,000
Ending Balance	5,031,000				6,564,000				7,220,000				5,031,000	6,564,000	7,220,000
Collectively Evaluated for Impairment	4,460,000				5,874,000				6,109,000				4,460,000	5,874,000	6,109,000
Individually Evaluated for Impairment	410,000				690,000				1,111,000				410,000	690,000	1,111,000
Ending Balance	5,031,000				6,564,000				7,220,000				5,031,000	6,564,000	7,220,000
Collectively Evaluated for Impairment	2,534,996,000				1,174,456,000				1,033,479,000				2,534,996,000	1,174,456,000	1,033,479,000
Individually Evaluated for Impairment	12,172,000				8,941,000				8,986,000				12,172,000	8,941,000	8,986,000
Loans acquired with deteriorated credit quality	14,046,000				2,520,000				4,052,000				14,046,000	2,520,000	4,052,000
Loans	2,561,214,000				1,185,917,000				1,046,517,000				2,561,214,000	1,185,917,000	1,046,517,000
Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Individually Evaluated for Impairment	161,000				0				0				161,000	0	0
Construction and Land Development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance				3,624,000				2,903,000				5,724,000	3,624,000	2,903,000	5,724,000
Charged-off loans													(137,000)	(231,000)	(190,000)
Recovery of previously charged-off loans													1,136,000	545,000	1,479,000
Provision for loan losses													4,339,000	407,000	(4,110,000)
Ending Balance	8,962,000				3,624,000				2,903,000				8,962,000	3,624,000	2,903,000
Collectively Evaluated for Impairment	8,879,000				3,604,000				2,891,000				8,879,000	3,604,000	2,891,000
Individually Evaluated for Impairment	66,000				20,000				12,000				66,000	20,000	12,000
Ending Balance	8,962,000				3,624,000				2,903,000				8,962,000	3,624,000	2,903,000
Collectively Evaluated for Impairment	1,896,553,000				906,053,000				740,090,000				1,896,553,000	906,053,000	740,090,000
Individually Evaluated for Impairment	5,167,000				3,212,000				3,689,000				5,167,000	3,212,000	3,689,000
Loans acquired with deteriorated credit quality	6,568,000				3,408,000				3,918,000				6,568,000	3,408,000	3,918,000
Loans	1,908,288,000				912,673,000				747,697,000				1,908,288,000	912,673,000	747,697,000
Construction and Land Development [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Individually Evaluated for Impairment	17,000				0				0				17,000	0	0
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance				24,743,000				23,643,000				29,167,000	24,743,000	23,643,000	29,167,000
Charged-off loans													(4,297,000)	(5,801,000)	(2,207,000)
Recovery of previously charged-off loans													1,317,000	2,138,000	1,730,000
Provision for loan losses													3,100,000	4,763,000	(5,047,000)
Ending Balance	24,863,000				24,743,000				23,643,000				24,863,000	24,743,000	23,643,000
Collectively Evaluated for Impairment	23,181,000				24,648,000				22,669,000				23,181,000	24,648,000	22,669,000
Individually Evaluated for Impairment	1,627,000				95,000				974,000				1,627,000	95,000	974,000
Ending Balance	24,863,000				24,743,000				23,643,000				24,863,000	24,743,000	23,643,000
Collectively Evaluated for Impairment	4,116,677,000				2,872,855,000				2,222,714,000				4,116,677,000	2,872,855,000	2,222,714,000
Individually Evaluated for Impairment	23,426,000				18,331,000				5,288,000				23,426,000	18,331,000	5,288,000
Loans acquired with deteriorated credit quality	1,238,000				524,000				540,000				1,238,000	524,000	540,000
Loans	4,141,341,000				2,891,710,000				2,228,542,000				4,141,341,000	2,891,710,000	2,228,542,000
Commercial and Industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Individually Evaluated for Impairment	55,000				0				0				55,000	0	0
Consumer and Other [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance				9,520,000				15,616,000				1,570,000	9,520,000	15,616,000	1,570,000
Charged-off loans													(15,518,000)	(24,016,000)	(18,002,000)
Recovery of previously charged-off loans													2,002,000	2,895,000	5,865,000
Provision for loan losses													9,870,000	15,025,000	26,183,000
Ending Balance	5,874,000				9,520,000				15,616,000				5,874,000	9,520,000	15,616,000
Collectively Evaluated for Impairment	5,874,000				9,293,000				12,609,000				5,874,000	9,293,000	12,609,000
Individually Evaluated for Impairment	0				227,000				3,007,000				0	227,000	3,007,000
Ending Balance	5,874,000				9,520,000				15,616,000				5,874,000	9,520,000	15,616,000
Collectively Evaluated for Impairment	352,663,000				265,613,000				240,066,000				352,663,000	265,613,000	240,066,000
Individually Evaluated for Impairment	0				516,000				4,930,000				0	516,000	4,930,000
Loans acquired with deteriorated credit quality	0				0				0				0	0	0
Loans	352,663,000				266,129,000				244,996,000				352,663,000	266,129,000	244,996,000
Consumer and Other [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Individually Evaluated for Impairment	0				0				0				0	0	0
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning Balance				$ 874,000				$ 537,000				$ 3,272,000	874,000	537,000	3,272,000
Charged-off loans													0	0	0
Recovery of previously charged-off loans													0	0	0
Provision for loan losses													448,000	337,000	(2,735,000)
Ending Balance	1,322,000				874,000				537,000				1,322,000	874,000	537,000
Ending Balance	$ 1,322,000				$ 874,000				$ 537,000				$ 1,322,000	$ 874,000	$ 537,000

Loans and Allowance for Loan 68

Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses, Purchased Credit Impaired Loans (Details) - Receivables Acquired with Deteriorated Credit Quality [Member] - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans and Allowance for Loan Losses - Purchase Credit Impaired [Line Items]
Purchased Loans Contractually Required Principal And Interest	$ 94,312,000	$ 1,359,000	$ 19,960,000
Purchased Loans Cash Flows Expected To Be Collected	48,498,000	547,000	14,257,000
Purchased Credit Impaired Loans Acquisition Date Fair Value	$ 48,302,000	$ 547,000	$ 14,257,000

Mortgage Servicing Rights (Deta

Mortgage Servicing Rights (Details) - USD ($)	3 Months Ended	4 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2015	Sep. 01, 2015
Mortgage Servicing Rights, Carrying Values [Abstract]
Gross carrying amount						$ 6,802,000
Accumulated amortization						(390,000)
Net carrying amount	$ 6,412,000	$ 6,412,000		$ 6,412,000	$ 6,412,000	6,412,000
Changes in mortgage servicing right [Roll Forward]
Beginning balance acquired in Magna Merger	6,412,000			6,412,000
Ending balance		6,412,000			6,412,000
Net Servicing Fee Revenues [Abstract]
Mortgage servicing rights associated with Fannie Mae portfolio	830,000,000
Proceeds from Sale of Mortgage Servicing Rights (MSR)	6,600,000		$ 0	6,747,626	0
Income Recorded from Sale of Mortgage Servicing Portfolio	241,000			241,000
Residential [Member]
Mortgage Servicing Rights, Carrying Values [Abstract]
Net carrying amount	6,412,000	6,412,000		6,412,000	6,412,000	$ 6,412,000	$ 6,641,000
Changes in mortgage servicing right [Roll Forward]
Beginning balance acquired in Magna Merger	$ 6,412,000			$ 6,412,000
Add: Originated MSRs		161,000
Servicing Asset at Amortized Cost, Amortization		(390,000)			(386,000)
Ending balance		6,412,000			6,412,000
Net Servicing Fee Revenues [Abstract]
Gross servicing fees					1,090,000
Late charges and other ancillary revenue					160,000
Gross servicing revenue					1,250,000
Servicing Asset at Amortized Cost, Amortization		$ (390,000)			(386,000)
Guaranty fees and loan pay-off interest					9,000
Other servicing expenses					51,000
Gross servicing expenses					446,000
Net servicing fee income					$ 804,000

Premises and Equipment and Le70

Premises and Equipment and Lease Commitments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 363,151,000	$ 175,326,000
Accumulated depreciation and amortization	(97,137,000)	(86,422,000)
Property, Plant and Equipment, Net	266,013,608	88,904,145
Depreciation and amortization expense	13,700,000	9,900,000	$ 8,500,000
Rent expense	11,700,000	8,400,000	$ 5,900,000
Capital Leases, Income Statement, Amortization Expense	$ 225,000
Capital lease interest rate	7.22%
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,018	$ 12,226,000
2,019	11,535,000
2,020	10,949,000
2,021	10,652,000
2,022	8,429,000
Thereafter	42,857,000
Total	96,648,000
Capital Leases, Future Minimum Payments Due, Rolling Maturity [Abstract]
2,018	426,000
2,019	470,000
2,020	470,000
2,021	470,000
2,022	470,000
Thereafter	3,028,000
Total minimum lease payments	5,334,000
Less: amount representing interest	(1,695,000)
Present value of net minimum lease payments	3,639,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	65,649,000	19,467,000
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 164,748,000	64,088,000
Building [Member] | Minimum
Property, Plant and Equipment [Line Items]
Range of Useful Lives	15 years
Building [Member] | Maximum
Property, Plant and Equipment [Line Items]
Range of Useful Lives	30 years
Leaseholds and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 38,913,000	28,789,000
Leaseholds and Leasehold Improvements [Member] | Minimum
Property, Plant and Equipment [Line Items]
Range of Useful Lives	15 years
Leaseholds and Leasehold Improvements [Member] | Maximum
Property, Plant and Equipment [Line Items]
Range of Useful Lives	20 years
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 93,841,000	$ 62,982,000
Furniture and Equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Range of Useful Lives	3 years
Furniture and Equipment [Member] | Maximum
Property, Plant and Equipment [Line Items]
Range of Useful Lives	20 years

Deposits (Details)

Deposits (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Time Deposits, Fiscal Year Maturity [Abstract]
2,018	$ 1,850,523,000
2,019	445,198,000
2,020	123,000,000
2,021	95,754,000
2,022	17,244,000
Thereafter	2,342,000
Time deposits, Total	2,534,060,910	$ 836,853,761
Time Deposits, $100,000 or greater	1,300,000,000	602,900,000
Deposit accounts in overdraft status	$ 3,500,000	$ 1,900,000

Federal Home Loan Bank Advanc72

Federal Home Loan Bank Advances (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Jul. 01, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank Advances	$ 1,300,000,000	$ 406,200,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	5,500,000,000
Remaining discount on Federal home loan bank advances	13,000	$ 92,000	$ 167,000
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
2,018	557,501,000
2,019	356,000,000
2,020	272,627,000
2,021	133,750,000
2,022	0
Thereafter	17,000
Federal home loan bank advances, Total	1,319,895,000
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	$ 4,300,000,000
Weighted Average [Member]
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due [Abstract]
2,018	1.46%
2,019	1.64%
2,020	1.74%
2,021	1.87%
2,022	0.00%
Thereafter	2.75%
Weighted average interest rate	1.61%

Other borrowings (Details)

Other borrowings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Subordinated debt and other borrowings	$ 465,504,589	$ 350,768,050
Debt issuance costs and fair value adjustments	$ (7,990,000)
Revolving credit facility
Debt Instrument [Line Items]
Date Established	Mar. 29, 2016
Maturity	Mar. 27, 2018
Subordinated debt and other borrowings	$ 0
Pinnacle Statutory Trust I
Debt Instrument [Line Items]
Date Established	Dec. 29, 2003
Maturity	Dec. 30, 2033
Subordinated debt and other borrowings	$ 10,310,000
Interest Rate (as percent)	4.40%
Coupon Structure	30-day LIBOR + 2.80%
Pinnacle Statutory Trust II
Debt Instrument [Line Items]
Date Established	Sep. 15, 2005
Maturity	Sep. 30, 2035
Subordinated debt and other borrowings	$ 20,619,000
Interest Rate (as percent)	3.09%
Coupon Structure	30-day LIBOR + 1.40%
Pinnacle Statutory Trust III
Debt Instrument [Line Items]
Date Established	Sep. 7, 2006
Maturity	Sep. 30, 2036
Subordinated debt and other borrowings	$ 20,619,000
Interest Rate (as percent)	3.34%
Coupon Structure	30-day LIBOR + 1.65%
Pinnacle Statutory Trust IV
Debt Instrument [Line Items]
Date Established	Oct. 31, 2007
Maturity	Sep. 30, 2037
Subordinated debt and other borrowings	$ 30,928,000
Interest Rate (as percent)	4.44%
Coupon Structure	30-day LIBOR + 2.85%
BNC Capital Trust I
Debt Instrument [Line Items]
Date Established	Apr. 3, 2003
Maturity	Apr. 15, 2033
Subordinated debt and other borrowings	$ 5,155,000
Interest Rate (as percent)	4.61%
Coupon Structure	30-day LIBOR + 3.25%
BNC Capital Trust II
Debt Instrument [Line Items]
Date Established	Mar. 11, 2004
Maturity	Apr. 7, 2034
Subordinated debt and other borrowings	$ 6,186,000
Interest Rate (as percent)	4.21%
Coupon Structure	30-day LIBOR + 2.85%
BNC Capital Trust III
Debt Instrument [Line Items]
Date Established	Sep. 23, 2004
Maturity	Sep. 23, 2034
Subordinated debt and other borrowings	$ 5,155,000
Interest Rate (as percent)	3.76%
Coupon Structure	30-day LIBOR + 2.40%
BNC Capital Trust IV
Debt Instrument [Line Items]
Date Established	Sep. 27, 2006
Maturity	Dec. 31, 2036
Subordinated debt and other borrowings	$ 7,217,000
Interest Rate (as percent)	3.39%
Coupon Structure	30-day LIBOR + 1.70%
Valley Financial Trust I
Debt Instrument [Line Items]
Date Established	Aug. 5, 2005
Maturity	Sep. 30, 2035
Subordinated debt and other borrowings	$ 4,124,000
Interest Rate (as percent)	4.77%
Coupon Structure	30-day LIBOR + 3.10%
Valley Financial Trust II
Debt Instrument [Line Items]
Date Established	Jun. 6, 2003
Maturity	Jun. 26, 2033
Subordinated debt and other borrowings	$ 7,217,000
Interest Rate (as percent)	3.08%
Coupon Structure	30-day LIBOR + 1.49%
Valley Financial Trust III
Debt Instrument [Line Items]
Date Established	Sep. 26, 2005
Maturity	Dec. 15, 2035
Subordinated debt and other borrowings	$ 5,155,000
Interest Rate (as percent)	3.11%
Coupon Structure	30-day LIBOR + 1.73%
Southcoast Capital Trust III
Debt Instrument [Line Items]
Date Established	Dec. 15, 2006
Maturity	Jan. 30, 2037
Subordinated debt and other borrowings	$ 10,310,000
Interest Rate (as percent)	3.19%
Coupon Structure	30-day LIBOR + 1.50%
Pinnacle Bank Subordinated Notes
Debt Instrument [Line Items]
Date Established	Jul. 30, 2015
Maturity	Jul. 30, 2025
Subordinated debt and other borrowings	$ 60,000,000
Interest Rate (as percent)	4.88%
Coupon Structure	Fixed1
Pinnacle Bank Subordinated Notes
Debt Instrument [Line Items]
Date Established	Mar. 10, 2016
Maturity	Jul. 30, 2025
Subordinated debt and other borrowings	$ 70,000,000
Interest Rate (as percent)	4.88%
Coupon Structure	Fixed1
Avenue Subordinated Notes
Debt Instrument [Line Items]
Date Established	Dec. 29, 2014
Maturity	Dec. 29, 2024
Subordinated debt and other borrowings	$ 20,000,000
Interest Rate (as percent)	6.75%
Coupon Structure	Fixed2
Pinnacle Financial Subordinated Notes
Debt Instrument [Line Items]
Date Established	Nov. 16, 2016
Maturity	Nov. 16, 2026
Subordinated debt and other borrowings	$ 120,000,000
Interest Rate (as percent)	5.25%
Coupon Structure	Fixed3
BNC Subordinated Notes
Debt Instrument [Line Items]
Date Established	Sep. 25, 2014
Maturity	Oct. 1, 2024
Subordinated debt and other borrowings	$ 60,000,000
Interest Rate (as percent)	5.50%
Coupon Structure	Fixed4
BNC Subordinated Note
Debt Instrument [Line Items]
Date Established	Oct. 15, 2013
Maturity	Oct. 15, 2023
Subordinated debt and other borrowings	$ 10,500,000
Interest Rate (as percent)	6.35%
Coupon Structure	30-day LIBOR + 5.0%(5)

Income Taxes (Details)

Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 0	$ 0	$ 96,000
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	63,496,000	49,769,000	41,721,000
Current State and Local Tax Expense (Benefit)	860,000	0	48,000
Total current tax expense (benefit)	64,356,000	49,769,000	41,769,000
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	26,339,000	12,776,000	4,963,000
State	1,826,000	1,614,000	857,000
Total deferred tax expense (benefit)	59,651,000	14,390,000	5,819,000
Income tax expense (benefit)	$ 124,006,536	64,159,167	47,588,528
Federal income tax statutory rate	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense (benefit) at statutory rate	$ 104,295,000	66,984,000	50,084,000
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	1,746,000	1,049,000	588,000
Tax-exempt securities	5,666,000	2,510,000	2,543,000
Federal tax credits	(434,000)	(282,000)	0
Bank owned life insurance	2,778,000	(1,242,000)	892,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Amount	(283,000)	(159,000)	(306,000)
Deferred tax revaluation expense	31,486,000	0	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	(5,365,000)	0	0
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	0	0	0
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	1,006,000	319,000	658,000
Income tax expense (benefit)	124,006,536	64,159,167	47,588,528
Deferred Tax Assets, Net [Abstract]
Loan loss allowance	16,240,000	22,308,000
Loans	46,567,000	15,534,000
Insurance	614,000	869,000
Accrued liability for supplemental retirement agreements	7,413,000	5,587,000
Restricted stock and stock options	8,232,000	8,643,000
Investments	0	4,275,000
Cash flow hedge	499,000	1,520,000
Equity Method Investments	635,000	858,000
Leases	1,738,000	1,627,000
Net operating loss carryforward	18,085,000	0
Other real estate owned	2,809,000	149,000
Other deferred tax assets	5,373,000	6,413,000
Total deferred tax assets	108,205,000	67,783,000
Deferred Tax Liabilities, Net [Abstract]
Depreciation and amortization	11,504,000	5,823,000
Core deposit intangible asset	14,073,000	5,621,000
Securities	616,000	0
REIT dividends	3,073,000	4,602,000
FHLB related liabilities	922,000	285,000
Debt Issuance Costs	1,077,000	1,001,000
Other deferred tax liabilities	1,171,000	679,000
Total deferred tax liabilities	32,436,000	18,011,000
Net deferred tax assets	75,769,000	49,772,000
Unrecognized tax benefits, beginning of period	1,274,000	134,000	391,000
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	1,564,000	1,140,000
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions			(257,000)
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0	0	0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0	0	0
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities	0	0	0
Unrecognized tax benefits, end of period	$ 2,838,000	$ 1,274,000	$ 134,000

Commitments and Contingent Li75

Commitments and Contingent Liabilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Loss Contingencies [Line Items]
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 3.1
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Amount of commitment	5,800
Commitments to Extend Credit [Member] | Home equity [Member]
Loss Contingencies [Line Items]
Amount of commitment	900
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Amount of commitment	$ 143.7
Maximum
Loss Contingencies [Line Items]
Expiry period of standby letter of credit, maximum	2 years

Salary Deferral Plans (Details)

Salary Deferral Plans (Details)	12 Months Ended
	Dec. 31, 2017USD ($)Rate	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Deferred Compensation Arrangements [Abstract]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | Rate	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | Rate	100.00%
Percentage of employee self-directed contributions matched by employer | Rate	4.00%
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Compensation expense	$ 5,900,000	$ 4,000,000	$ 2,700,000
Other liabilities	$ 114,889,760	90,267,267
Cavalry ESOP [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Number of participant accepting the settlement	11
Number of remaining participant in agreements	1
Other liabilities	$ 1,000,000	$ 1,200,000	$ 1,300,000
Discount rate of fair value of future obligation owed to remaining participants | Rate	5.00%
Supplemental Employee Retirement Plan [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Other liabilities	$ 33,000,000
SERP covered by Rabbi Trust [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Other liabilities	$ 20,000,000

Stock Options, Stock Apprecia77

Stock Options, Stock Appreciation Rights, Restricted Shares and Salary Stock Units (Details)	12 Months Ended
	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of equity incentive plan					2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant					672,000
Vesting period	5 years
Exercisable period	10 years
Number [Roll Forward]
Outstanding, Beginning Balance (in shares)	550,490	1,251,601	698,488
Options assumed upon acquisition of CapitalMark (in shares)			858,148
Granted (in shares)	0	0	0
Exercised (in shares)	(275,904)	(698,673)	(303,754)
Forfeited (in shares)	0	(3)	(5)
Outstanding, Ending Balance (in shares)	274,586	550,490	1,251,601	698,488
Options exercisable (in shares)					274,586
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, Beginning Balance (in dollars per share) | $ / shares	$ 20.75	$ 21.23	$ 26.89
Granted (in dollars per share) | $ / shares	0	0	0
Exercised (in dollars per share) | $ / shares	20.09	21.63	24.09
Forfeited (in dollars per share) | $ / shares	0	29.50	23.88
Outstanding, Ending Balance (in dollars per share) | $ / shares	$ 21.40	$ 20.75	$ 21.23	$ 26.89
Options exercisable (in dollars per share) | $ / shares					$ 21.40
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding	3 years 22 days
Options exercisable	3 years 22 days
Aggregate intrinsic value [Abstract]
Outstanding | $					$ 12,329,000
Options exercisable | $					$ 12,329,000
Quoted closing price of common stock (in dollars per share) | $ / shares					$ 66.30
Number Of Shares Settled During Period Stock Appreciation Rights Exercised		1,137	559
Number of shares settled during period Stock Swap	277
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $	$ 12,300,000	$ 21,700,000	$ 7,600,000
Share-based Compensation [Abstract]
Stock compensation expense | $	19,538,000	10,971,000	6,033,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $	7,665,000	4,306,000	2,368,000
Allocated Share-based Compensation Expense, Net of Tax | $	$ 11,873,000	$ 6,665,000	$ 3,665,000
Number [Roll Forward]
Unvested, beginning of period (in shares)	820,539	866,314	849,198
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	261,942	177,664	231,504
Stock Issued During Period, Shares, Conversion of Units	43,680	43,694	43,711
Restrictions lapsed and shares released to associates/directors (in shares)	(292,896)	(245,873)	(240,102)
Shares forfeited by participants (in shares)	(34,020)	(21,260)	(17,997)
Unvested, end of period (in shares)	936,135	820,539	866,314	849,198
Grant date weighted average cost [Roll Forward]
Unvested, beginning of period (in dollars per share) | $ / shares	$ 36.47	$ 31.39	$ 24.26
Shares awarded (in dollars per share) | $ / shares	67.14	48.61	45.71
Conversion of restricted share units to restricted share awards (in dollars per share) | $ / shares	69.40	46.37	34.50
Restrictions lapsed and shares released to associates/directors (in dollars per share) | $ / shares	37.59	28.39	23
Shares forfeited (in dollars per share) | $ / shares	54.71	39.88	30.01
Unvested, end of period (in dollars per share) | $ / shares	$ 50.08	$ 36.47	$ 31.39	$ 24.26
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years		5 years	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	261,942	177,664	231,504
Shares forfeited by participants (in shares)	(34,020)	(21,260)	(17,997)
Shares Unvested (in shares)	820,539	866,314	849,198	849,198	936,135
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	261,942	177,664	231,504
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	261,942	177,664	231,504
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Stock-based compensation expense | $	$ 19,538,083	$ 10,970,849	$ 7,341,603
CapitalMark Bank & Trust [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Granted (in dollars per share) | $ / shares			$ 17.62
Bank of North Carolina [Member]
Grant date weighted average cost [Roll Forward]
Shares awarded (in dollars per share) | $ / shares	$ 67.25
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Acquisitions in Period	136,890
Leadership Team [Member]
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years			5 years
Leadership Team [Member] | CapitalMark Bank & Trust [Member]
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years			3 years
Employee Stock Option [Member]
Number [Roll Forward]
Outstanding, Ending Balance (in shares)	274,586
Stock Swap [Member]
Number [Roll Forward]
Exercised (in shares)		750
Stock Appreciation Rights [Member]
Number [Roll Forward]
Exercised (in shares)		(2,435)	(1,276)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Exercised (in dollars per share) | $ / shares		$ 15.60	$ 15.60
Time Based Awards 2015 [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			190,528
Shares forfeited by participants (in shares)	(19,136)
Unvested, end of period (in shares)	98,413
Restricted stock grants grouped by similar vesting criteria [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			190,528
Restrictions lapsed and shares released to participants (in shares)	53,574
Shares withheld for taxes by participants (in shares)	19,405
Shares forfeited by participants (in shares)	(19,136)
Shares Unvested (in shares)	98,413				98,413
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			190,528
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			190,528
Time Based Awards 2015 [Member] | Leadership Team [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			16,605
Shares forfeited by participants (in shares)	0
Unvested, end of period (in shares)	13,287
Restricted stock grants grouped by similar vesting criteria [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			16,605
Restrictions lapsed and shares released to participants (in shares)	2,530
Shares withheld for taxes by participants (in shares)	788
Shares forfeited by participants (in shares)	0
Shares Unvested (in shares)	13,287				13,287
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			16,605
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			16,605
Time Based Awards 2016 [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		143,273
Shares forfeited by participants (in shares)	(15,126)
Unvested, end of period (in shares)	101,341
Restricted stock grants grouped by similar vesting criteria [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		143,273
Restrictions lapsed and shares released to participants (in shares)	19,490
Shares withheld for taxes by participants (in shares)	7,316
Shares forfeited by participants (in shares)	(15,126)
Shares Unvested (in shares)	101,341				101,341
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		143,273
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		143,273
Time Based Awards 2017
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	248,265
Shares forfeited by participants (in shares)	(14,085)
Unvested, end of period (in shares)	233,594
Restricted stock grants grouped by similar vesting criteria [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	248,265
Restrictions lapsed and shares released to participants (in shares)	388
Shares withheld for taxes by participants (in shares)	198
Shares forfeited by participants (in shares)	(14,085)
Shares Unvested (in shares)	233,594				233,594
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	248,265
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	248,265
Time Based Awards 2017 | Bank of North Carolina [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	136,890
Shares forfeited by participants (in shares)	0
Unvested, end of period (in shares)	96,573
Restricted stock grants grouped by similar vesting criteria [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	136,890
Restrictions lapsed and shares released to participants (in shares)	40,317
Shares withheld for taxes by participants (in shares)	0
Shares forfeited by participants (in shares)	0
Shares Unvested (in shares)	96,573				96,573
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	136,890
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	136,890
Time Based Awards 2017 | Minimum
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years	3 years
Time Based Awards 2017 | Minimum | Bank of North Carolina [Member]
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years	3 years
Time Based Awards 2017 | Maximum
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years	5 years
Time Based Awards 2017 | Maximum | Bank of North Carolina [Member]
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years	5 years
Performance Based Awards 2015 [Member] | Leadership Team [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			43,711
Shares forfeited by participants (in shares)	0
Unvested, end of period (in shares)	43,711
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years			5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			43,711
Restrictions lapsed and shares released to participants (in shares)	0
Shares withheld for taxes by participants (in shares)	0
Shares forfeited by participants (in shares)	0
Shares Unvested (in shares)	43,711				43,711
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			43,711
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			43,711
Performance Based Awards 2015 [Member] | Leadership Team [Member] | CapitalMark Bank & Trust [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			11,302
Shares forfeited by participants (in shares)	0
Unvested, end of period (in shares)	7,537
Restricted stock grants grouped by similar vesting criteria [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			11,302
Restrictions lapsed and shares released to participants (in shares)	2,679
Shares withheld for taxes by participants (in shares)	1,086
Shares forfeited by participants (in shares)	0
Shares Unvested (in shares)	7,537				7,537
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			11,302
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			11,302
Performance Based Awards 2016 [Member] | Leadership Team [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		43,694
Shares forfeited by participants (in shares)	0
Unvested, end of period (in shares)	43,694
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		43,694
Restrictions lapsed and shares released to participants (in shares)	0
Shares withheld for taxes by participants (in shares)	0
Shares forfeited by participants (in shares)	0
Shares Unvested (in shares)	43,694				43,694
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		43,694
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		43,694
Performance Based Awards 2016 [Member] | Leadership Team [Member] | Avenue Financial Holdings, Inc. (Avenue) [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		15,468
Shares forfeited by participants (in shares)	0
Unvested, end of period (in shares)	15,468
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		15,468
Restrictions lapsed and shares released to participants (in shares)	0
Shares withheld for taxes by participants (in shares)	0
Shares forfeited by participants (in shares)	0
Shares Unvested (in shares)	15,468				15,468
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		15,468
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		15,468
Performance Based Awards 2017 | Leadership Team [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	43,680
Shares forfeited by participants (in shares)	0
Unvested, end of period (in shares)	43,680
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	43,680
Restrictions lapsed and shares released to participants (in shares)	0
Shares withheld for taxes by participants (in shares)	0
Shares forfeited by participants (in shares)	0
Shares Unvested (in shares)	43,680				43,680
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	43,680
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	43,680
Outside Director Awards 2015 [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			13,069
Shares forfeited by participants (in shares)	0
Unvested, end of period (in shares)	0
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years			1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			13,069
Restrictions lapsed and shares released to participants (in shares)	11,298
Shares withheld for taxes by participants (in shares)	1,771
Shares forfeited by participants (in shares)	0
Shares Unvested (in shares)	0				0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			13,069
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			13,069
Outside Director Awards 2016 [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		18,923
Shares forfeited by participants (in shares)	(1,186)
Unvested, end of period (in shares)	0
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years		1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		18,923
Restrictions lapsed and shares released to participants (in shares)	15,471
Shares withheld for taxes by participants (in shares)	2,266
Shares forfeited by participants (in shares)	(1,186)
Shares Unvested (in shares)	0				0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		18,923
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		18,923
Outside Director Awards 2017
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	13,677
Shares forfeited by participants (in shares)	0
Unvested, end of period (in shares)	10,505
Restricted stock grants grouped by similar vesting criteria [Abstract]
Vesting Period in years	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	13,677
Restrictions lapsed and shares released to participants (in shares)	2,376
Shares withheld for taxes by participants (in shares)	796
Shares forfeited by participants (in shares)	0
Shares Unvested (in shares)	10,505				10,505
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	13,677
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	13,677
Restricted Stock Units (RSUs) [Member]
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	24,916	26,683	28,378	29,087
Restricted stock grants grouped by similar vesting criteria [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	24,916	26,683	28,378	29,087
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	24,916	26,683	28,378	29,087
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	24,916	26,683	28,378	29,087
Restricted Stock Units (RSUs) [Member] | Minimum
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	72,537	73,474	58,200	58,404
Restricted stock grants grouped by similar vesting criteria [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	72,537	73,474	58,200	58,404
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	72,537	73,474	58,200	58,404
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	72,537	73,474	58,200	58,404
Restricted Stock Units (RSUs) [Member] | Maximum
Number [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	109,339	110,223	101,850	102,209
Restricted stock grants grouped by similar vesting criteria [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	109,339	110,223	101,850	102,209
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	109,339	110,223	101,850	102,209
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	109,339	110,223	101,850	102,209
Tranche 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				5 years
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				5 years
Shares settled into RSAs as of period end (in shares)				21,856
Tranche 2014 (1) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Shares settled into RSAs as of period end (in shares)				21,856
Tranche 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			2 years	4 years
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			2 years	4 years
Holding period per tranche			3 years
Shares settled into RSAs as of period end (in shares)				21,847
Tranche 2015 (1) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years
Shares settled into RSAs as of period end (in shares)				21,847
Tranche 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		2 years	2 years	3 years
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years	2 years	3 years
Holding period per tranche		3 years	2 years
Shares settled into RSAs as of period end (in shares)				21,840
Tranche 2016 (1) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				2 years
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				2 years
Shares settled into RSAs as of period end (in shares)				21,840
Tranche 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years	2 years	2 years
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years	2 years	2 years
Holding period per tranche	3 years	2 years	1 year
Tranche 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years	2 years
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years	2 years
Holding period per tranche	2 years	1 year
Tranche 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years
Restricted Stock Units [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years
Holding period per tranche	1 year

Derivative Instruments - Non-he

Derivative Instruments - Non-hedge Derivatives (Details) - Non-hedge derivatives - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional amount of interest rate swap	$ 1,497,250	$ 1,333,144
Estimated fair value of interest rate swap	(95)	(134)
Pay fixed / receive variable swaps
Derivative [Line Items]
Notional amount of interest rate swap	748,625	666,572
Estimated fair value of interest rate swap	13,771	16,004
Pay variable / receive fixed swaps
Derivative [Line Items]
Notional amount of interest rate swap	748,625	666,572
Estimated fair value of interest rate swap	$ (13,866)	$ (16,138)

Derivative Instruments - Hedge

Derivative Instruments - Hedge Derivatives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Gain contract termination	$ 3,100,000
Interest Rate Swap April 2016 - October 2022
Derivative [Line Items]
Forecasted Notional Amount	200,000,000
Liabilities	4,583,000	$ 6,732,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	(2,785,000)	(4,091,000)
Interest Rate Swap April 2016 - April 2020
Derivative [Line Items]
Forecasted Notional Amount	$ 33,000,000
Receive Rate	3 month LIBOR
Pay Rate (as percent)	2.265%
Liabilities	$ 146,000	727,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	(89,000)	(442,000)
Interest Rate Swap April 2016 - April 2022
Derivative [Line Items]
Forecasted Notional Amount	$ 33,000,000
Receive Rate	3 month LIBOR
Pay Rate (as percent)	2.646%
Liabilities	$ 647,000	1,304,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	(393,000)	(792,000)
Interest Rate Swap October 2016 - October 2020
Derivative [Line Items]
Forecasted Notional Amount	$ 33,000,000
Receive Rate	3 month LIBOR
Pay Rate (as percent)	2.523%
Liabilities	$ 382,000	1,081,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	(232,000)	(657,000)
Interest Rate Swap October 2017 - October 2021
Derivative [Line Items]
Forecasted Notional Amount	$ 33,000,000
Receive Rate	3 month LIBOR
Pay Rate (as percent)	2.992%
Liabilities	$ 998,000	1,200,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	(606,000)	(729,000)
Interest Rate Swap April 2018 - July 2022
Derivative [Line Items]
Forecasted Notional Amount	$ 34,000,000
Receive Rate	3 month LIBOR
Pay Rate (as percent)	3.118%
Liabilities	$ 1,205,000	1,222,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	(732,000)	(743,000)
Interest Rate Swap July 2018 - October 2022
Derivative [Line Items]
Forecasted Notional Amount	$ 34,000,000
Receive Rate	3 month LIBOR
Pay Rate (as percent)	3.158%
Liabilities	$ 1,205,000	1,198,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	(733,000)	(728,000)
Interest Rate Swap July 2014 - August 2020
Derivative [Line Items]
Forecasted Notional Amount	0
Asset	0
Liabilities		2,704,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	0	1,643,000
Interest Rate Swap July 2014 - July 2021
Derivative [Line Items]
Forecasted Notional Amount	$ 0
Receive Rate	1 month LIBOR
Pay Rate (as percent)	2.09%
Asset	$ 0	395,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	0	240,000
Interest Rate Swap July 2014 - July 2022
Derivative [Line Items]
Forecasted Notional Amount	$ 0
Receive Rate	1 month LIBOR
Pay Rate (as percent)	2.27%
Asset	$ 0	610,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	0	371,000
Interest Rate Swap July 2014 - July 2023
Derivative [Line Items]
Forecasted Notional Amount	$ 0
Receive Rate	1 month LIBOR
Pay Rate (as percent)	2.42%
Asset	$ 0	874,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	0	531,000
Interest Rate Swap July 2014 - July 2024
Derivative [Line Items]
Forecasted Notional Amount	$ 0
Receive Rate	1 month LIBOR
Pay Rate (as percent)	2.50%
Asset	$ 0	900,000
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	0	547,000
Interest Rate Swap August 2015 - August 2020
Derivative [Line Items]
Forecasted Notional Amount	$ 0
Receive Rate	1 month LIBOR
Pay Rate (as percent)	1.47%
Asset	$ 0
Liabilities		(75,000)
Unrealized Gain (Loss) in Accumulated Other Comprehensive Income	$ 0	$ (46,000)
Hedging derivative | Interest Rate Swap April 2016 - April 2020 | Minimum
Derivative [Line Items]
Lower maturity range date term	Apr. 1, 2016
Hedging derivative | Interest Rate Swap April 2016 - April 2020 | Maximum
Derivative [Line Items]
Higher maturity range date term	Apr. 30, 2020
Hedging derivative | Interest Rate Swap April 2016 - April 2022 | Minimum
Derivative [Line Items]
Lower maturity range date term	Apr. 1, 2016
Hedging derivative | Interest Rate Swap April 2016 - April 2022 | Maximum
Derivative [Line Items]
Higher maturity range date term	Apr. 30, 2022
Hedging derivative | Interest Rate Swap October 2016 - October 2020 | Minimum
Derivative [Line Items]
Lower maturity range date term	Oct. 1, 2016
Hedging derivative | Interest Rate Swap October 2016 - October 2020 | Maximum
Derivative [Line Items]
Higher maturity range date term	Oct. 31, 2020
Hedging derivative | Interest Rate Swap October 2017 - October 2021 | Minimum
Derivative [Line Items]
Lower maturity range date term	Oct. 1, 2017
Hedging derivative | Interest Rate Swap October 2017 - October 2021 | Maximum
Derivative [Line Items]
Higher maturity range date term	Oct. 31, 2021
Hedging derivative | Interest Rate Swap April 2018 - July 2022 | Minimum
Derivative [Line Items]
Lower maturity range date term	Apr. 1, 2018
Hedging derivative | Interest Rate Swap April 2018 - July 2022 | Maximum
Derivative [Line Items]
Higher maturity range date term	Jul. 31, 2022
Hedging derivative | Interest Rate Swap July 2018 - October 2022 | Minimum
Derivative [Line Items]
Lower maturity range date term	Jul. 1, 2018
Hedging derivative | Interest Rate Swap July 2018 - October 2022 | Maximum
Derivative [Line Items]
Higher maturity range date term	Oct. 31, 2022
Hedging derivative | Interest Rate Swap July 2014 - July 2021 | Minimum
Derivative [Line Items]
Lower maturity range date term	Jul. 1, 2014
Hedging derivative | Interest Rate Swap July 2014 - July 2021 | Maximum
Derivative [Line Items]
Higher maturity range date term	Jul. 31, 2021
Hedging derivative | Interest Rate Swap July 2014 - July 2022 | Minimum
Derivative [Line Items]
Lower maturity range date term	Jul. 1, 2014
Hedging derivative | Interest Rate Swap July 2014 - July 2022 | Maximum
Derivative [Line Items]
Higher maturity range date term	Jul. 31, 2022
Hedging derivative | Interest Rate Swap July 2014 - July 2023 | Minimum
Derivative [Line Items]
Lower maturity range date term	Jul. 1, 2014
Hedging derivative | Interest Rate Swap July 2014 - July 2023 | Maximum
Derivative [Line Items]
Higher maturity range date term	Jul. 31, 2023
Hedging derivative | Interest Rate Swap July 2014 - July 2024 | Minimum
Derivative [Line Items]
Lower maturity range date term	Jul. 1, 2014
Hedging derivative | Interest Rate Swap July 2014 - July 2024 | Maximum
Derivative [Line Items]
Higher maturity range date term	Jul. 31, 2024
Hedging derivative | Interest Rate Swap August 2015 - August 2020 | Minimum
Derivative [Line Items]
Lower maturity range date term	Aug. 1, 2015
Hedging derivative | Interest Rate Swap August 2015 - August 2020 | Maximum
Derivative [Line Items]
Higher maturity range date term	Aug. 31, 2020

Employment Contracts (Details)

Employment Contracts (Details)	12 Months Ended
	Dec. 31, 2017
Compensation Related Costs [Abstract]
Number of senior executives that enter into automatic renewing employment agreements	4
Number of senior executive to whom entity is obligated to pay certain amount	4

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Director [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 0	$ 20,000	$ 0

Fair Value of Financial Instr82

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]
Alternative investments	$ 24,400	$ 8,300
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Valuation allowance of impaired loans	2,300	1,100
Other Liabilities [Member]
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, beginning of period	0	0
Total realized gains included in income	0	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Purchases	0	0
Issuances	0	0
Settlements	0	0
Transfers out of Level 3	0	0
Fair value, September 30	0	0
Total realized gains included in income related to financial assets and liabilities still on the consolidated balance sheet at period end	0	0
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
U.S. treasury securities	30,445	250
U.S. government agency securities	180,801	21,769
Mortgage-backed securities	1,263,819	976,626
State and municipal securities	784,612	212,720
Asset-Backed Securities, at Carrying Value	173,292	78,580
Corporate notes and other	82,314	8,601
Total investment securities available-for-sale	2,515,283	1,298,546
Alternative investments	28,874	10,478
Other assets	11,812	13,340
Total assets at fair value	2,555,969	1,322,364
Liabilities at fair value [Abstract]
Other liabilities	13,886	15,758
Total liabilities at fair value	13,886	15,758
Fair Value, Measurements, Recurring [Member] | Quoted Market Prices in an Active Market (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
U.S. treasury securities	0	0
U.S. government agency securities	0	0
Mortgage-backed securities	0	0
State and municipal securities	0	0
Asset-Backed Securities, at Carrying Value		0
Agency backed securities, Fair Value Disclosure	0
Corporate notes and other	0	0
Total investment securities available-for-sale	0	0
Alternative investments	0	0
Other assets	0	0
Total assets at fair value	0	0
Liabilities at fair value [Abstract]
Other liabilities	0	0
Total liabilities at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Models with Significant Observable Market Parameters (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
U.S. treasury securities	30,445	250
U.S. government agency securities	180,801	21,769
Mortgage-backed securities	1,263,819	976,626
State and municipal securities	767,583	212,720
Asset-Backed Securities, at Carrying Value	173,292	78,580
Corporate notes and other	82,314	8,601
Total investment securities available-for-sale	2,498,254	1,298,546
Alternative investments	0	0
Other assets	11,812	13,340
Total assets at fair value	2,510,066	1,311,886
Liabilities at fair value [Abstract]
Other liabilities	13,886	15,758
Total liabilities at fair value	13,886	15,758
Fair Value, Measurements, Recurring [Member] | Models with Significant Unobservable Market Parameters (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
U.S. treasury securities	0	0
U.S. government agency securities	0	0
Mortgage-backed securities	0	0
State and municipal securities	17,029	0
Asset-Backed Securities, at Carrying Value		0
Agency backed securities, Fair Value Disclosure	0
Corporate notes and other	0	0
Total investment securities available-for-sale	17,029	0
Alternative investments	28,874	10,478
Other assets	0	0
Total assets at fair value	45,903	10,478
Liabilities at fair value [Abstract]
Other liabilities	0	0
Total liabilities at fair value	0	0
Fair Value, Measurements, Nonrecurring [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned	27,831	6,090
Impaired Financing Receivable, with Related Allowance, Recorded Investment	55,138	26,506
Total	82,969	32,596
Total losses on other real estate owned	(203)	135
Total losses on collateral dependent nonaccrual loans, net	(722)	(7,173)
Total losses	(519)	(7,308)
Fair Value, Measurements, Nonrecurring [Member] | Quoted Market Prices in an Active Market (Level 1) [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Total	0	0
Fair Value, Measurements, Nonrecurring [Member] | Models with Significant Observable Market Parameters (Level 2) [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned	0	0
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0	0
Total	0	0
Fair Value, Measurements, Nonrecurring [Member] | Models with Significant Unobservable Market Parameters (Level 3) [Member]
Assets and liabilities measured at fair value on a nonrecurring basis [Abstract]
Other real estate owned	27,831	6,090
Impaired Financing Receivable, with Related Allowance, Recorded Investment	55,138	26,506
Total	82,969	32,596
Other Assets [Member]
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, beginning of period	10,478	9,764
Total realized gains included in income	605	131
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Acquired	17,062
Purchases	2,330	1,639
Issuances	0	0
Settlements	(1,601)	(1,056)
Transfers out of Level 3	0	0
Fair value, September 30	28,874	10,478
Total realized gains included in income related to financial assets and liabilities still on the consolidated balance sheet at period end	605	131
Available-for-sale Securities [Member]
Assets measured on recurring basis, unobservable input reconciliation, calculation [Roll Forward]
Fair value, beginning of period	0	0
Total realized gains included in income	66	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	709	0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Assets Acquired	16,254
Purchases	0	0
Issuances	0	0
Settlements	0	0
Transfers out of Level 3	0	0
Fair value, September 30	17,029	0
Total realized gains included in income related to financial assets and liabilities still on the consolidated balance sheet at period end	$ 66	$ 0

Fair Value of Financial Instr83

Fair Value of Financial Instruments, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Financial assets [Abstract]
Securities held-to-maturity, fair value	$ 20,829,978	$ 25,233,254
Loans Receivable, Fair Value Disclosure	15,252,953,000	8,178,982,000
Mortgage loans held-for-sale	104,986,000	47,892,000
Loans Held-for-sale, Fair Value Disclosure	25,761,000	22,674,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	16,516,342,000	8,579,664,000
Federal Home Loan Bank advances	1,313,311,000	406,491,000
Subordinated debt and other borrowings	445,098,000	328,049,000
Standby Letters of Credit [Member]
Off-balance sheet instruments [Abstract]
Standby letters of credit	800,000	740,000
Commitments to Extend Credit [Member]
Off-balance sheet instruments [Abstract]
Commitments to extend credit	2,264,000	383,000
Reported Value Measurement [Member]
Financial assets [Abstract]
Securities held-to-maturity, fair value	20,762,000	25,251,000
Loans Receivable, Fair Value Disclosure	15,565,876,000	8,390,944,000
Mortgage loans held-for-sale	103,729,000	47,710,000
Loans Held-for-sale, Fair Value Disclosure	25,456,000	22,588,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	16,586,964,000	8,845,014,000
Federal Home Loan Bank advances	1,319,909,000	406,304,000
Subordinated debt and other borrowings	465,505,000	350,768,000
Reported Value Measurement [Member] | Standby Letters of Credit [Member]
Off-balance sheet instruments [Abstract]
Commitments to extend credit	5,788,425,000	3,374,269,000
Reported Value Measurement [Member] | Commitments to Extend Credit [Member]
Off-balance sheet instruments [Abstract]
Standby letters of credit	143,684,000	131,418,000
Estimate of Fair Value Measurement [Member] | Quoted Market Prices in an Active Market (Level 1) [Member]
Financial assets [Abstract]
Securities held-to-maturity, fair value	0	0
Loans Receivable, Fair Value Disclosure	0	0
Mortgage loans held-for-sale	0	0
Loans Held-for-sale, Fair Value Disclosure	0	0
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	0	0
Subordinated debt and other borrowings	0	0
Estimate of Fair Value Measurement [Member] | Quoted Market Prices in an Active Market (Level 1) [Member] | Standby Letters of Credit [Member]
Off-balance sheet instruments [Abstract]
Standby letters of credit	0	0
Estimate of Fair Value Measurement [Member] | Quoted Market Prices in an Active Market (Level 1) [Member] | Commitments to Extend Credit [Member]
Off-balance sheet instruments [Abstract]
Commitments to extend credit	0	0
Estimate of Fair Value Measurement [Member] | Models with Significant Observable Market Parameters (Level 2) [Member]
Financial assets [Abstract]
Securities held-to-maturity, fair value	20,830,000	25,233,000
Loans Receivable, Fair Value Disclosure	0	0
Mortgage loans held-for-sale	104,986,000	47,892,000
Loans Held-for-sale, Fair Value Disclosure	25,761,000	22,674,000
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	0	0
Federal Home Loan Bank advances	0	0
Subordinated debt and other borrowings	0	0
Estimate of Fair Value Measurement [Member] | Models with Significant Observable Market Parameters (Level 2) [Member] | Standby Letters of Credit [Member]
Off-balance sheet instruments [Abstract]
Standby letters of credit	0	0
Estimate of Fair Value Measurement [Member] | Models with Significant Observable Market Parameters (Level 2) [Member] | Commitments to Extend Credit [Member]
Off-balance sheet instruments [Abstract]
Commitments to extend credit	0	0
Estimate of Fair Value Measurement [Member] | Models with Significant Unobservable Market Parameters (Level 3) [Member]
Financial assets [Abstract]
Securities held-to-maturity, fair value	0	0
Loans Receivable, Fair Value Disclosure	15,252,953,000	8,178,982,000
Mortgage loans held-for-sale	0	0
Loans Held-for-sale, Fair Value Disclosure	0	0
Financial liabilities [Abstract]
Deposits and securities sold under agreements to repurchase	16,516,342,000	8,579,664,000
Federal Home Loan Bank advances	1,313,311,000	406,491,000
Subordinated debt and other borrowings	445,098,000	328,049,000
Estimate of Fair Value Measurement [Member] | Models with Significant Unobservable Market Parameters (Level 3) [Member] | Standby Letters of Credit [Member]
Off-balance sheet instruments [Abstract]
Standby letters of credit	800,000	740,000
Estimate of Fair Value Measurement [Member] | Models with Significant Unobservable Market Parameters (Level 3) [Member] | Commitments to Extend Credit [Member]
Off-balance sheet instruments [Abstract]
Commitments to extend credit	$ 2,264,000	$ 383,000

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Proceeds from Issuance of Subordinated Long-term Debt	$ 133,000
Low Income Housing Partnerships [Member] | Other Assets [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Maximum Loss Exposure	23,912	$ 24,150
Liability Recognized	0	0
Trust Preferred Issuances [Member] | Subordinated Debt [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Liability Recognized	132,995	82,476
Commercial Troubled Debt Restructurings [Member] | Loans [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Maximum Loss Exposure	3,760	11,572
Liability Recognized	$ 0	$ 0

Regulatory Matters (Details)

Regulatory Matters (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Preceding period of retained earnings used in calculation of dividend payable	2 years
Retained earnings	$ 519,144,543	$ 381,072,505
Cash Dividends Paid to Parent Company by Consolidated Subsidiaries	63,100,000
Dividends Payable, Amount Per Share			$ 0.14	$ 0.12	$ 0.08
Pinnacle Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	305,100,000
Actual Amount
Total capital to risk weighted assets:	2,134,344,000	1,136,782,000
Tier I capital to risk weighted assets:	1,936,313,000	949,193,000
Common Equity Tier I Capital to risk weighted assets	1,936,209,000	949,070,000
Tier I capital to average assets (*):	$ 1,936,313,000	$ 949,193,000
Actual Ratios
Total capital to risk weighted assets:	11.3471%	11.20%
Tier I capital to risk weighted assets:	10.2943%	9.30%
Common Equity Tier I Capital to Risk Weighted Assets	10.2938%	9.30%
Tier I capital to average assets (*):	9.70%	9.20%
Minimum Capital Requirement
Total capital to risk weighted assets:	$ 1,504,765,000	$ 814,254,000
Tier I capital to risk weighted assets:	1,128,574,000	610,690,000
Common Equity Tier I Risk Based Capital to risk weighted assets	846,430,000	458,018,000
Tier I capital to average assets (*):	$ 796,235,000	$ 412,124,000
Minimum Capital Requirement - Ratios
Total capital to risk weighted assets:	8.00%	8.00%
Tier I capital to risk weighted assets:	6.00%	6.00%
Common Equity Tier I Risk Based Capital to risk weighted assets:	4.50%	4.50%
Tier I capital to average assets (*):	4.00%	4.00%
Minimum To Be Well Capitalized
Total capital to risk weighted assets:	$ 1,880,956,000	$ 1,017,817,000
Tier I capital to risk weighted assets:	1,504,765,000	814,254,000
Common Equity Tier I capital to risk weighted assets	1,222,621,000	661,581,000
Tier I capital to average assets (*):	$ 995,294,000	$ 515,155,000
Minimum To Be Well Capitalized - Ratios
Total capital to risk weighted assets:	10.00%	10.00%
Tier I capital to risk weighted assets:	8.00%	8.00%
Common Equity Tier I capital to risk weighted assets:	6.50%	6.50%
Tier I capital to average assets (*):	5.00%	5.00%
Pinnacle Financial [Member]
Actual Amount
Total capital to risk weighted assets:	$ 2,266,161,000	$ 1,211,105,000
Tier I capital to risk weighted assets:	1,725,323,000	882,654,000
Common Equity Tier I Capital to risk weighted assets	1,725,219,000	802,532,000
Tier I capital to average assets (*):	$ 1,725,323,000	$ 882,654,000
Actual Ratios
Total capital to risk weighted assets:	12.0102%	11.90%
Tier I capital to risk weighted assets:	9.1438%	8.60%
Common Equity Tier I Capital to Risk Weighted Assets	9.1433%	7.90%
Tier I capital to average assets (*):	8.60%	8.60%
Minimum Capital Requirement
Total capital to risk weighted assets:	$ 1,509,496,000	$ 816,857,000
Tier I capital to risk weighted assets:	1,132,122,000	612,643,000
Common Equity Tier I Risk Based Capital to risk weighted assets	849,092,000	459,482,000
Tier I capital to average assets (*):	$ 797,861,000	$ 412,902,000
Minimum Capital Requirement - Ratios
Total capital to risk weighted assets:	8.00%	8.00%
Tier I capital to risk weighted assets:	6.00%	6.00%
Common Equity Tier I Risk Based Capital to risk weighted assets:	4.50%	4.50%
Tier I capital to average assets (*):	4.00%	4.00%

Parent Company Only Financial86

Parent Company Only Financial Information (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment in unconsolidated subsidiaries:
Other assets																$ 757,332,667	$ 330,651,002
Total assets																22,205,699,847	11,194,622,599
Liabilities and Equity [Abstract]
Subordinated debt and other borrowings																465,504,589	350,768,050
Other Liabilities																114,889,760	90,267,267
Stockholders' equity																3,707,952,031	1,496,696,112	$ 1,155,611,300	$ 802,693,381
Total liabilities and stockholders' equity																22,205,699,847	11,194,622,599
CONDENSED STATEMENTS OF OPERATIONS [Abstract]
Income from equity method investment													$ 37,957,692	$ 31,402,923	$ 20,591,484
Other income (loss)													46,168,416	36,554,938	24,715,442
Expenses:
Interest expense - subordinated debentures													92,831,238	38,614,647	18,536,965
Personnel expense, including stock compensation													209,661,812	140,818,772	105,928,914
Income tax expense (benefit)													124,006,536	64,159,167	47,588,528
Net income	$ 26,798,000	$ 64,442,000	$ 43,086,000	$ 39,653,000	$ 36,097,000	$ 32,377,000	$ 30,787,000	$ 27,964,000	$ 26,854,000	$ 24,149,000	$ 22,665,000	$ 21,843,000	173,979,487	127,224,695	95,509,402
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]
Net income	26,798,000	$ 64,442,000	$ 43,086,000	39,653,000	36,097,000	$ 32,377,000	$ 30,787,000	27,964,000	26,854,000	$ 24,149,000	$ 22,665,000	21,843,000	173,979,487	127,224,695	95,509,402
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion													(23,618,474)	16,995,490	10,268,576
Stock-based compensation expense													19,538,083	10,970,849	7,341,603
Deferred tax (expense) benefit													59,651,000	14,390,000	5,819,000
Income from equity method investment													(37,957,692)	(31,402,923)	(20,591,484)
Excess tax benefit from stock compensation													(5,365,493)	(4,604,007)	(4,116,120)
(Increase) decrease in other assets													(33,297,361)	(17,411,223)	(2,359,490)
(Decrease) increase in other liabilities													(17,699,526)	2,829,656	(7,487,499)
Net cash provided by operating activities													147,941,106	126,638,676	84,603,830
Investing activities:
Increase in equity method investment													0	(74,100,000)	(75,440,530)
Dividends received from equity method investment													21,650,046	28,982,009	7,152,000
Increase in other investments													(7,804,237)	(27,508,882)	(1,712,685)
Net cash used in investing activities													(2,097,602,927)	(1,253,404,506)	(742,598,028)
Financing activities:
Proceeds from Issuance of Common Stock													192,193,750	0	0
Exercise of common stock options and stock appreciation rights, net of shares surrendered for taxes													493,347	11,589,495	3,602,805
Excess tax benefit from stock compensation													0	4,604,007	4,116,120
Common dividends paid													35,907,449	24,725,598	18,307,075
Net cash provided by financing activities													2,545,613,698	989,459,917	791,038,021
Cash and Cash Equivalents, Period Increase (Decrease)													595,951,877	(137,305,913)	133,043,823
Investment Income, Dividend													63,100,000	27,700,000	19,000,000
Parent Company [Member]
Assets [Abstract]
Cash and cash equivalents	64,851,000			36,984,000	36,984,000			21,740,000	21,740,000			36,496,000	36,984,000	21,740,000	36,496,000	64,851,000	36,984,000	$ 21,740,000	$ 36,496,000
Investments in consolidated subsidiaries																3,861,508,000	1,585,212,000
Investment in unconsolidated subsidiaries:
Unconsolidated subsidiaries																3,995,000	2,476,000
Other investments																69,256,000	61,374,000
Current income tax receivable																20,017,000	6,831,000
Other assets																29,524,000	29,182,000
Total assets																4,049,151,000	1,722,059,000
Liabilities and Equity [Abstract]
Taxes Payable																24,000	0
Subordinated debt and other borrowings																337,818,000	223,337,000
Other Liabilities																3,357,000	2,026,000
Stockholders' equity																3,707,952,000	1,496,696,000
Total liabilities and stockholders' equity																$ 4,049,151,000	$ 1,722,059,000
CONDENSED STATEMENTS OF OPERATIONS [Abstract]
Income from bank subsidiaries													63,100,000	27,663,000	19,038,000
Income from nonbank subsidiaries													297,000	5,198,000	210,000
Income from equity method investment													10,126,000	7,663,000	0
Other income (loss)													380,000	21,000	(132,000)
Expenses:
Interest expense - subordinated debentures													9,856,000	1,997,000	220,000
Personnel expense, including stock compensation													16,629,000	10,971,000	7,342,000
Other expense													8,076,000	3,653,000	2,889,000
Income before income taxes and equity in undistributed income of subsidiaries													39,342,000	23,924,000	8,665,000
Income tax expense (benefit)													(12,748,000)	(3,428,000)	(4,119,000)
Income before equity in undistributed income of subsidiaries													52,090,000	27,352,000	12,784,000
Equity in undistributed income of bank subsidiaries													121,341,000	104,318,000	81,536,000
Equity in undistributed income (loss) of nonbank subsidiaries													548,000	(4,445,000)	1,189,000
Net income													173,979,000	127,225,000	95,509,000
CONDENSED STATEMENTS OF CASH FLOWS [Abstract]
Net income													173,979,000	127,225,000	95,509,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion													290,000	543,000	0
Stock-based compensation expense													19,538,000	10,971,000	7,342,000
Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable													24,000	(12,000)	(10,870,000)
Deferred tax (expense) benefit													5,919,000	1,025,000	(394,000)
Income from equity method investment													(10,368,000)	(8,350,000)	0
Excess tax benefit from stock compensation													(5,365,000)	(4,604,000)	(4,116,000)
Loss (gain) on other investments													(350,000)	497,000	132,000
(Increase) decrease in other assets													(3,989,000)	2,636,000	1,194,000
(Decrease) increase in other liabilities													(9,194,000)	3,157,000	3,771,000
Equity in undistributed (income) loss of bank subsidiaries													(121,341,000)	(104,318,000)	(81,530,000)
Equity in undistributed (income) loss of nonbank subsidiaries													(548,000)	4,445,000	(1,189,000)
Net cash provided by operating activities													48,595,000	33,215,000	9,849,000
Investing activities:
Investments in consolidated subsidiaries													(182,288,000)	(118,878,000)	0
Investment in unconsolidated banking subsidiaries													2,712,000	0	0
Increase in equity method investment													0	(11,400,000)	0
Dividends received from equity method investment													5,655,000	3,255,000	0
Increase in other investments													(815,000)	(710,000)	(335,000)
Net cash used in investing activities													(177,448,000)	(127,733,000)	(335,000)
Financing activities:
Net (decrease) increase in subordinated debt and other borrowings													(60,000)	118,294,000	(13,682,000)
Proceeds from Issuance of Common Stock													192,194,000	0	0
Exercise of common stock options and stock appreciation rights, net of shares surrendered for taxes													493,000	11,589,000	3,603,000
Excess tax benefit from stock compensation													0	4,604,000	4,116,000
Common dividends paid													(35,907,000)	(24,725,000)	(18,307,000)
Net cash provided by financing activities													156,720,000	109,762,000	(24,270,000)
Cash and Cash Equivalents, Period Increase (Decrease)													27,867,000	15,244,000	(14,756,000)
Cash and cash equivalents, beginning of year				$ 36,984,000				$ 21,740,000				$ 36,496,000	36,984,000	21,740,000	36,496,000
Cash and cash equivalents, end of year	$ 64,851,000				$ 36,984,000				$ 21,740,000				$ 64,851,000	$ 36,984,000	$ 21,740,000

Quarterly Financial Results (87

Quarterly Financial Results (unaudited) (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 208,085,000	$ 202,167,000	$ 123,743,000	$ 102,143,000	$ 101,493,000	$ 97,380,000	$ 83,762,000	$ 80,974,000	$ 77,797,000	$ 67,192,000	$ 55,503,000	$ 54,679,000	$ 636,138,249	$ 363,608,928	$ 255,169,880
Net interest income	174,731,000	173,182,000	106,627,000	88,767,000	89,413,000	86,635,000	75,044,000	73,902,000	71,475,000	62,059,000	51,831,000	51,269,000	519,643,067	306,666,223	227,444,418
Provision for loan losses	6,281,000	6,920,000	6,812,000	3,651,000	3,046,000	6,108,000	5,280,000	3,894,000	5,459,000	2,228,000	1,186,000	315,000	23,663,944	18,328,058	9,188,497
Net income before taxes	81,965,000	99,503,000	63,074,000	53,444,000	54,345,000	48,693,000	46,546,000	41,800,000	40,432,000	36,134,000	33,917,000	32,617,000	297,986,023	191,383,862	143,097,930
Net income	$ 26,798,000	$ 64,442,000	$ 43,086,000	$ 39,653,000	$ 36,097,000	$ 32,377,000	$ 30,787,000	$ 27,964,000	$ 26,854,000	$ 24,149,000	$ 22,665,000	$ 21,843,000	$ 173,979,487	$ 127,224,695	$ 95,509,402
Basic net income per common share (in dollars per share)	$ 0.35	$ 0.84	$ 0.81	$ 0.83	$ 0.79	$ 0.71	$ 0.75	$ 0.70	$ 0.67	$ 0.64	$ 0.65	$ 0.62	$ 2.73	$ 2.96	$ 2.58
Diluted net income per common share (in dollars per share)	$ 0.35	$ 0.83	$ 0.80	$ 0.82	$ 0.78	$ 0.71	$ 0.73	$ 0.68	$ 0.65	$ 0.62	$ 0.64	$ 0.62	$ 2.70	$ 2.91	$ 2.52