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Loans and Allowance for Loan Losses - Loan Classification by Risk Rating Category (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | $ 18,174,906,000 | $ 17,707,549,000
Potential problem loans not included in nonperforming assets |  | 190,300,000 | 176,300,000
Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 17,776,254,000 | 17,346,673,000
Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 109,001,000 | 93,163,000
Substandard-accrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | [1] | 193,507,000 | 179,879,000
Substandard-nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 96,144,000 | 87,834,000
Doubtful-nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 0 | 0
Commercial real estate - mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 7,419,146,000 | 7,164,954,000
Commercial real estate - mortgage | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 7,252,503,000 | 6,998,485,000
Commercial real estate - mortgage | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 51,552,000 | 55,932,000
Commercial real estate - mortgage | Substandard-accrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | [1] | 76,171,000 | 78,202,000
Commercial real estate - mortgage | Substandard-nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 38,920,000 | 32,335,000
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 |  | 2,887,628,000 | 2,844,447,000
Consumer real estate - mortgage | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 2,830,701,000 | 2,787,570,000
Consumer real estate - mortgage | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 6,916,000 | 7,902,000
Consumer real estate - mortgage | Substandard-accrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | [1] | 17,880,000 | 20,906,000
Consumer real estate - mortgage | Substandard-nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 32,131,000 | 28,069,000
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 |  | 2,097,570,000 | 2,072,455,000
Construction and land development | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 2,083,602,000 | 2,059,376,000
Construction and land development | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 7,843,000 | 4,334,000
Construction and land development | Substandard-accrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | [1] | 3,350,000 | 5,358,000
Construction and land development | Substandard-nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 2,775,000 | 3,387,000
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 |  | 5,419,520,000 | 5,271,421,000
Commercial and industrial | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 5,259,503,000 | 5,148,726,000
Commercial and industrial | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 41,980,000 | 24,284,000
Commercial and industrial | Substandard-accrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | [1] | 96,049,000 | 75,351,000
Commercial and industrial | Substandard-nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 21,988,000 | 23,060,000
Commercial and industrial | Doubtful-nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 0 | 0
Consumer and other |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 351,042,000 | 354,272,000
Consumer and other | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 349,945,000 | 352,516,000
Consumer and other | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 710,000 | 711,000
Consumer and other | Substandard-accrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | [1] | 57,000 | 62,000
Consumer and other | Substandard-nonaccrual |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 330,000 | 983,000
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 troubled debt restructurings. Potential problem loans, which are not included in nonaccrual loans, amounted to approximately $190.3 million at March 31, 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. + References No definition available. + Details
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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://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=82891408&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=84173941&loc=d3e5074-111524 + Details
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