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Note 3 - Loans Leases Receivable - Loans by Internally Assigned Risk Rating (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Loans |  | $ 3,046,799,276 | $ 2,956,713,493
Commercial Portfolio Segment [Member] |  |  |
Loans | [1] | 1,201,085,625 | 1,134,516,315
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |
Loans |  | 1,079,132,775 | 1,031,963,703
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans |  | 20,327,365 | 10,944,924
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans |  | 22,713,694 | 24,578,731
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |  |
Loans |  |  | 270,559
Commercial Real Estate Portfolio Segment [Member] |  |  |
Loans |  | 1,357,703,386 | 1,303,491,882
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 346,996,627 | 332,742,477
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |
Loans |  | 171,404,628 | 186,402,404
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 839,302,131 | 784,347,000
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 337,628,357 | 318,293,608
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction Loans [Member] |  |  |
Loans |  | 166,752,090 | 179,142,839
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 813,622,461 | 767,119,909
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 5,576,201 | 8,230,060
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 |  | 15,242,642 | 10,068,870
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 3,792,069 | 6,218,809
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction Loans [Member] |  |  |
Loans |  | 2,872,538 | 5,479,565
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  | 10,437,028 | 7,158,221
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Owner Occupied Commercial Real Estate Loans [Member] |  |  |
Loans |  |  |
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 |  | $ 2,479,877,220 | $ 2,371,249,799
As a % of Total |  | 100.00% | 100.00%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Pass [Member] |  |  |
Loans |  | $ 2,397,135,683 | $ 2,296,520,059
As a % of Total |  | 96.66% | 96.85%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member] |  |  |
Loans |  | $ 42,926,208 | $ 31,023,854
As a % of Total |  | 1.73% | 1.31%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member] |  |  |
Loans |  | $ 39,815,329 | $ 43,435,326
As a % of Total |  | 1.61% | 1.83%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Doubtful [Member] |  |  |
Loans |  |  | $ 270,559
As a % of Total |  |  | 0.01%
[1] | Includes equipment financing agreements outstanding at m2, totaling $78,911,791 and $66,758,397 as of March 31, 2018 and December 31, 2017, respectively.

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