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Note 2 - Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Notes Tables |
Amortized cost and fair value of investment securities |
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | (Losses) |  | Value
June 30, 2018: |  |  |  |  |  |  |  |  |  |  |  |
Securities HTM: |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 399,002,344 |  | $ | 4,916,288 |  | $ | (7,700,914) |  | $ | 396,217,718
Other securities |  |  | 1,050,000 |  |  | — |  |  | (15,350) |  |  | 1,034,650
|  | $ | 400,052,344 |  | $ | 4,916,288 |  | $ | (7,716,264) |  | $ | 397,252,368
Securities AFS: |  |  |  |  |  |  |  |  |  |  |  |
U.S. govt. sponsored agency securities |  | $ | 36,767,888 |  | $ | 7,872 |  | $ | (1,109,224) |  | $ | 35,666,536
Residential mortgage-backed and related securities |  |  | 164,791,715 |  |  | 49,915 |  |  | (6,307,182) |  |  | 158,534,448
Municipal securities |  |  | 60,160,248 |  |  | 221,112 |  |  | (874,093) |  |  | 59,507,267
Other securities |  |  | 4,254,509 |  |  | — |  |  | (18,089) |  |  | 4,236,420
|  | $ | 265,974,360 |  | $ | 278,899 |  | $ | (8,308,588) |  | $ | 257,944,671
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | (Losses) |  | Value
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |
Securities HTM: |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 378,424,205 |  | $ | 2,763,718 |  | $ | (2,488,119) |  | $ | 378,699,804
Other securities |  |  | 1,050,000 |  |  | — |  |  | — |  |  | 1,050,000
|  | $ | 379,474,205 |  | $ | 2,763,718 |  | $ | (2,488,119) |  | $ | 379,749,804
Securities AFS: |  |  |  |  |  |  |  |  |  |  |  |
U.S. govt. sponsored agency securities |  | $ | 38,409,157 |  | $ | 37,344 |  | $ | (349,967) |  | $ | 38,096,534
Residential mortgage-backed and related securities |  |  | 165,459,470 |  |  | 155,363 |  |  | (2,313,529) |  |  | 163,301,304
Municipal securities |  |  | 66,176,364 |  |  | 660,232 |  |  | (211,100) |  |  | 66,625,496
Other securities |  |  | 4,014,004 |  |  | 896,384 |  |  | (25,815) |  |  | 4,884,573
|  | $ | 274,058,995 |  | $ | 1,749,323 |  | $ | (2,900,411) |  | $ | 272,907,907
Securities have been in a continuous unrealized loss position |
|  | Less than 12 Months |  | 12 Months or More |  | Total
|  |  |  | Gross |  |  |  | Gross |  |  |  | Gross
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
June 30, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities HTM: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 140,257,617 |  | $ | (3,873,043) |  | $ | 61,121,755 |  | $ | (3,827,871) |  | $ | 201,379,372 |  | $ | (7,700,914)
Other securities |  |  | 1,034,649 |  |  | (15,350) |  |  | — |  |  | — |  |  | 1,034,649 |  |  | (15,350)
|  | $ | 141,292,266 |  | $ | (3,888,393) |  | $ | 61,121,755 |  | $ | (3,827,871) |  | $ | 202,414,021 |  | $ | (7,716,264)
Securities AFS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. govt. sponsored agency securities |  | $ | 31,724,483 |  | $ | (928,027) |  | $ | 3,532,286 |  | $ | (181,197) |  | $ | 35,256,769 |  | $ | (1,109,224)
Residential mortgage-backed and related securities |  |  | 93,074,220 |  |  | (3,402,034) |  |  | 59,724,819 |  |  | (2,905,148) |  |  | 152,799,039 |  |  | (6,307,182)
Municipal securities |  |  | 36,033,296 |  |  | (648,203) |  |  | 7,706,943 |  |  | (225,890) |  |  | 43,740,239 |  |  | (874,093)
Other securities |  |  | 4,236,420 |  |  | (18,089) |  |  | — |  |  | — |  |  | 4,236,420 |  |  | (18,089)
|  | $ | 165,068,419 |  | $ | (4,996,353) |  | $ | 70,964,048 |  | $ | (3,312,235) |  | $ | 236,032,467 |  | $ | (8,308,588)
|  | Less than 12 Months |  | 12 Months or More |  | Total
|  |  |  | Gross |  |  |  | Gross |  |  |  | Gross
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities HTM: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal securities |  | $ | 23,750,826 |  | $ | (354,460) |  | $ | 72,611,780 |  | $ | (2,133,659) |  | $ | 96,362,606 |  | $ | (2,488,119)
Securities AFS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. govt. sponsored agency securities |  | $ | 28,576,258 |  | $ | (200,022) |  | $ | 3,640,477 |  | $ | (149,945) |  | $ | 32,216,735 |  | $ | (349,967)
Residential mortgage-backed and related securities |  |  | 88,927,779 |  |  | (871,855) |  |  | 57,931,731 |  |  | (1,441,674) |  |  | 146,859,510 |  |  | (2,313,529)
Municipal securities |  |  | 10,229,337 |  |  | (41,151) |  |  | 9,997,433 |  |  | (169,949) |  |  | 20,226,770 |  |  | (211,100)
Other securities |  |  | 923,535 |  |  | (25,815) |  |  | — |  |  | — |  |  | 923,535 |  |  | (25,815)
|  | $ | 128,656,909 |  | $ | (1,138,843) |  | $ | 71,569,641 |  | $ | (1,761,568) |  | $ | 200,226,550 |  | $ | (2,900,411)
Realized gain (loss) on investments |
| Three and Six Months Ended |  |  |  |
| June 30, 2017 |  |  |  |
Proceeds from sales of securities | $ | 13,554,075 |  |  |  |
Gross gains from sales of securities |  | 59,568 |  |  |  |
Gross losses from sales of securities |  | (21,104) |  |  |  |
Investments classified by maturity date |
|  | Amortized Cost |  | Fair Value
Securities HTM: |  |  |  |  |  |
Due in one year or less |  | $ | 1,732,495 |  | $ | 1,737,807
Due after one year through five years |  |  | 25,021,326 |  |  | 25,051,928
Due after five years |  |  | 373,298,523 |  |  | 370,462,633
|  | $ | 400,052,344 |  | $ | 397,252,368
Securities AFS: |  |  |  |  |  |
Due in one year or less |  | $ | 2,882,932 |  | $ | 2,891,934
Due after one year through five years |  |  | 25,265,433 |  |  | 24,969,540
Due after five years |  |  | 73,034,280 |  |  | 71,548,749
|  |  | 101,182,645 |  |  | 99,410,223
Residential mortgage-backed and related securities |  |  | 164,791,715 |  |  | 158,534,448
|  | $ | 265,974,360 |  | $ | 257,944,671
Schedule of investment in callable securities |
|  | Amortized Cost |  | Fair Value
Securities HTM: |  |  |  |  |  |
Municipal securities |  | $ | 232,556,893 |  | $ | 230,900,385
Securities AFS: |  |  |  |  |  |
U.S. govt. sponsored agency securities |  |  | 4,998,914 |  |  | 4,873,050
Municipal securities |  |  | 52,730,591 |  |  | 51,992,220
|  | $ | 57,729,505 |  | $ | 56,865,270

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