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Loans and Allowance for Loan Losses (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Loans and Allowance for Loan Losses [Abstract]      
Percentage of loan portfolio as commercial loan (in hundredths) 75.00%    
Risk rated loans $ 500,000    
Financing Receivable, Recorded Investment [Line Items]      
Loans 4,315,561,552   4,144,493,486
Potential problem loans not included in nonperforming assets 77,100,000   65,000,000
Average balance of impaired loans 16,134,000   21,484,000
Estimated increase in interest income if nonaccrual loans had been on accrual status 416,000 573,000  
Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,457,335,000   1,383,435,000
Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 698,528,000   695,616,000
Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 292,875,000   316,191,000
Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,697,634,000   1,605,547,000
Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 169,190,000   143,704,000
Accruing Loans [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 4,292,333,000   4,106,664,000
Accruing Loans [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,450,581,000   1,360,965,000
Accruing Loans [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 688,346,000   686,343,000
Accruing Loans [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 291,790,000   315,008,000
Accruing Loans [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,693,029,000   1,601,162,000
Accruing Loans [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 168,587,000   143,186,000
Accruing Loans [Member] | Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 4,146,261,000   3,979,630,000
Accruing Loans [Member] | Pass [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,417,022,000   1,332,387,000
Accruing Loans [Member] | Pass [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 672,747,000   670,412,000
Accruing Loans [Member] | Pass [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 253,501,000   275,876,000
Accruing Loans [Member] | Pass [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,634,704,000   1,557,923,000
Accruing Loans [Member] | Pass [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 168,287,000   143,032,000
Accruing Loans [Member] | Special Mention [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 69,006,000   62,006,000
Accruing Loans [Member] | Special Mention [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 16,291,000   8,282,000
Accruing Loans [Member] | Special Mention [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 2,667,000   1,824,000
Accruing Loans [Member] | Special Mention [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 26,739,000   31,835,000
Accruing Loans [Member] | Special Mention [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 23,163,000   20,065,000
Accruing Loans [Member] | Special Mention [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 146,000   0
Accruing Loans [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 77,066,000 [1]   65,028,000 [1]
Accruing Loans [Member] | Substandard [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 17,268,000 [1]   20,296,000 [1]
Accruing Loans [Member] | Substandard [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 12,932,000 [1]   14,107,000 [1]
Accruing Loans [Member] | Substandard [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 11,550,000 [1]   7,297,000 [1]
Accruing Loans [Member] | Substandard [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 35,162,000 [1]   23,174,000 [1]
Accruing Loans [Member] | Substandard [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 154,000 [1]   154,000 [1]
Nonaccrual Loans [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 15,678,000   18,183,000
Nonaccrual Loans [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,754,000   9,017,000
Nonaccrual Loans [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,239,000   5,289,000
Nonaccrual Loans [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 978,000   1,070,000
Nonaccrual Loans [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,387,000   2,565,000
Nonaccrual Loans [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 320,000   242,000
Nonaccrual Loans [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 15,678,000   18,183,000
Nonaccrual Loans [Member] | Substandard [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,754,000   9,017,000
Nonaccrual Loans [Member] | Substandard [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,239,000   5,289,000
Nonaccrual Loans [Member] | Substandard [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 978,000   1,070,000
Nonaccrual Loans [Member] | Substandard [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,387,000   2,565,000
Nonaccrual Loans [Member] | Substandard [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 320,000   242,000
Nonaccrual Loans [Member] | Doubtful [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0   0
Nonaccrual Loans [Member] | Doubtful [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0   0
Nonaccrual Loans [Member] | Doubtful [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0   0
Nonaccrual Loans [Member] | Doubtful [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0   0
Nonaccrual Loans [Member] | Doubtful [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0   0
Nonaccrual Loans [Member] | Doubtful [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0   0
Troubled Debt Restructurings [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 7,551,000 [2]   19,646,000 [2]
Troubled Debt Restructurings [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0 [2]   13,453,000 [2]
Troubled Debt Restructurings [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 3,943,000 [2]   3,984,000 [2]
Troubled Debt Restructurings [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 107,000 [2]   113,000 [2]
Troubled Debt Restructurings [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 3,218,000 [2]   1,820,000 [2]
Troubled Debt Restructurings [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 283,000 [2]   276,000 [2]
Troubled Debt Restructurings [Member] | Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 519,000 [2]   4,939,000 [2]
Troubled Debt Restructurings [Member] | Pass [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0 [2]   2,564,000 [2]
Troubled Debt Restructurings [Member] | Pass [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 66,000 [2]   1,666,000 [2]
Troubled Debt Restructurings [Member] | Pass [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 107,000 [2]   113,000 [2]
Troubled Debt Restructurings [Member] | Pass [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 263,000 [2]   320,000 [2]
Troubled Debt Restructurings [Member] | Pass [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 83,000 [2]   276,000 [2]
Troubled Debt Restructurings [Member] | Special Mention [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,020,000 [2]   0 [2]
Troubled Debt Restructurings [Member] | Special Mention [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0 [2]   0 [2]
Troubled Debt Restructurings [Member] | Special Mention [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 820,000 [2]   0 [2]
Troubled Debt Restructurings [Member] | Special Mention [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0 [2]   0 [2]
Troubled Debt Restructurings [Member] | Special Mention [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0 [2]   0 [2]
Troubled Debt Restructurings [Member] | Special Mention [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 200,000 [2]   0 [2]
Troubled Debt Restructurings [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,012,000 [2]   14,707,000 [2]
Troubled Debt Restructurings [Member] | Substandard [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0 [2]   10,889,000 [2]
Troubled Debt Restructurings [Member] | Substandard [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 3,057,000 [2]   2,318,000 [2]
Troubled Debt Restructurings [Member] | Substandard [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0 [2]   0 [2]
Troubled Debt Restructurings [Member] | Substandard [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 2,955,000 [2]   1,500,000 [2]
Troubled Debt Restructurings [Member] | Substandard [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 0 [2]   0 [2]
Impaired Loans [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 23,229,000   37,829,000
Impaired Loans [Member] | Commercial Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 6,754,000   22,470,000
Impaired Loans [Member] | Consumer Real Estate - Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 10,182,000   9,273,000
Impaired Loans [Member] | Construction and Land Development [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 1,085,000   1,183,000
Impaired Loans [Member] | Commercial and Industrial [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans 4,605,000   4,385,000
Impaired Loans [Member] | Consumer and Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans $ 603,000   $ 518,000
[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 $77.1 million at June 30, 2014, compared to $65.0 million at December 31, 2013.
[2] Troubled debt restructurings are presented as an impaired loan; however, they continue to accrue interest at contractual rates