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Loans and Allowance for Loan Losses - Loan Classification by Risk Rating Category (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		$ 19,345,642	$ 17,707,549
Potential problem loans not included in nonperforming assets		254,000	176,300
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		18,820,735	17,346,673
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		194,127	93,163
Substandard-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	[1]	257,517	179,879
Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		73,263	87,834
Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0	0
Commercial real estate - mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		7,709,245	7,164,954
Commercial real estate - mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		7,478,442	6,998,485
Commercial real estate - mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		89,057	55,932
Commercial real estate - mortgage | Substandard-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	[1]	119,155	78,202
Commercial real estate - mortgage | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		22,591	32,335
Commercial real estate - mortgage | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0	0
Consumer real estate - mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		3,025,502	2,844,447
Consumer real estate - mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		2,983,694	2,787,570
Consumer real estate - mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		5,771	7,902
Consumer real estate - mortgage | Substandard-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	[1]	12,948	20,906
Consumer real estate - mortgage | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		23,089	28,069
Consumer real estate - mortgage | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0	0
Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		2,253,303	2,072,455
Construction and land development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		2,244,217	2,059,376
Construction and land development | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		2,846	4,334
Construction and land development | Substandard-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	[1]	4,193	5,358
Construction and land development | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		2,047	3,387
Construction and land development | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0	0
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		5,891,038	5,271,421
Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		5,648,775	5,148,726
Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		95,743	24,284
Commercial and industrial | Substandard-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	[1]	121,160	75,351
Commercial and industrial | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		25,360	23,060
Commercial and industrial | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		0	0
Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		466,554	354,272
Consumer and other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		465,607	352,516
Consumer and other | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		710	711
Consumer and other | Substandard-accrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	[1]	61	62
Consumer and other | Substandard-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		176	983
Consumer and other | Doubtful-nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		$ 0	$ 0
[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 troubled debt restructurings. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $254.0 million at September 30, 2019, compared to $176.3 million at December 31, 2018.

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- Definition

Represents performing loans which possess certain weaknesses that cause management to have serious doubts as to the ability of such borrowers to comply with the present loan repayment terms and which may result in the future disclosure of such loans as either nonaccrual, 90 days or more past due, or a troubled debt restructuring.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

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