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Note 4 - Loans Leases Receivable - Loans by Internally Assigned Risk Rating (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Loans |  | $ 2,956,713,493 | $ 2,397,414,282
Commercial Portfolio Segment [Member] |  |  |
Loans | [1] | 1,134,516,315 | 827,637,263
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |
Loans |  | 1,098,722,101 | 796,568,451
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans |  | 10,944,924 | 6,305,772
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans |  | 24,578,731 | 24,763,040
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |  |
Loans |  | 270,559 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Loans |  | 1,303,491,882 | 1,093,458,860
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 332,742,477 | 332,387,621
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |
Loans |  | 186,402,404 | 165,149,491
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 784,347,000 | 595,921,748
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 318,293,608 | 314,447,662
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction Loans [Member] |  |  |
Loans |  | 179,142,839 | 158,108,465
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 767,119,909 | 582,854,048
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 8,230,060 | 7,559,380
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Construction Loans [Member] |  |  |
Loans |  | 1,780,000 | 1,780,000
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 10,068,870 | 4,437,122
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 6,218,809 | 10,380,369
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction Loans [Member] |  |  |
Loans |  | 5,479,565 | 5,261,026
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 7,158,221 | 8,630,578
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  |  | 210
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Construction Loans [Member] |  |  |
Loans |  |  |
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  |  |
Commercial and Commercial Real Estate Portfolio Segments [Member] |  |  |
Loans |  | $ 2,438,008,197 | $ 1,921,096,123
As a % of Total |  | 100.00% | 100.00%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Pass [Member] |  |  |
Loans |  | $ 2,363,278,457 | $ 1,851,978,626
As a % of Total |  | 96.94% | 96.40%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member] |  |  |
Loans |  | $ 31,023,854 | $ 20,082,274
As a % of Total |  | 1.27% | 1.05%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member] |  |  |
Loans |  | $ 43,435,326 | $ 49,035,013
As a % of Total |  | 1.78% | 2.55%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Doubtful [Member] |  |  |
Loans |  | $ 270,559 | $ 210
As a % of Total |  | 0.01% | 0.00%
[1] | Includes loans outstanding at QCBT's wholly-owned subsidiary, m2, totaling $60,981,381 and $38,668,209 as of September 30, 2017 and December 31, 2016, respectively.

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