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Loans and Allowance for Loan Losses - Loan Classification by Risk Rating Category (Details) - USD ($)		Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans		$ 16,326,017,000	$ 15,633,116,000
Potential problem loans not included in nonperforming assets		158,100,000	164,000,000
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		15,966,626,000	15,237,775,000
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		126,936,000	168,713,000
Substandard-accrual
Financing Receivable, Recorded Investment [Line Items]
Loans	[1]	162,253,000	169,173,000
Substandard-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		70,202,000	57,455,000
Doubtful-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		0	0
Commercial real estate - mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans		6,794,288,000	6,669,610,000
Commercial real estate - mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		6,628,989,000	6,487,368,000
Commercial real estate - mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		76,856,000	94,134,000
Commercial real estate - mortgage | Substandard-accrual
Financing Receivable, Recorded Investment [Line Items]
Loans	[1]	63,343,000	72,044,000
Commercial real estate - mortgage | Substandard-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		25,100,000	16,064,000
Commercial real estate - mortgage | Doubtful-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		0	0
Consumer real estate - mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans		2,580,766,000	2,561,214,000
Consumer real estate - mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		2,533,268,000	2,503,688,000
Consumer real estate - mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		11,661,000	18,356,000
Consumer real estate - mortgage | Substandard-accrual
Financing Receivable, Recorded Investment [Line Items]
Loans	[1]	17,307,000	21,053,000
Consumer real estate - mortgage | Substandard-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		18,530,000	18,117,000
Consumer real estate - mortgage | Doubtful-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		0	0
Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Loans		2,095,875,000	1,908,288,000
Construction and land development | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		2,081,071,000	1,880,704,000
Construction and land development | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		4,149,000	8,148,000
Construction and land development | Substandard-accrual
Financing Receivable, Recorded Investment [Line Items]
Loans	[1]	7,037,000	13,468,000
Construction and land development | Substandard-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		3,618,000	5,968,000
Construction and land development | Doubtful-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		0	0
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans		4,490,886,000	4,141,341,000
Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		4,360,699,000	4,014,656,000
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		33,524,000	46,898,000
Commercial and industrial | Substandard-accrual
Financing Receivable, Recorded Investment [Line Items]
Loans	[1]	74,491,000	62,529,000
Commercial and industrial | Substandard-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		22,172,000	17,258,000
Commercial and industrial | Doubtful-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		0	0
Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans		364,202,000	352,663,000
Consumer and other | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans		362,599,000	351,359,000
Consumer and other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans		746,000	1,177,000
Consumer and other | Substandard-accrual
Financing Receivable, Recorded Investment [Line Items]
Loans	[1]	75,000	79,000
Consumer and other | Substandard-nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Loans		782,000	48,000
Consumer and other | Doubtful-nonaccrual
Financing Receivable, Recorded Investment [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 the impact of nonaccrual loans and troubled debt restructurings. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $158.1 million at March 31, 2018, compared to $164.0 million at December 31, 2017.

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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.

+ References

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- Definition

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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