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Fair Value Disclosures - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Securities available-for-sale, at fair value | $ 198,272,685 | $ 201,687,683
Restricted investments | 12,397,950 | 11,499,000
Liabilities: |  |
Noninterest-bearing demand deposits | 329,095,443 | 319,861,237
Interest-bearing demand deposits | 331,628,819 | 311,482,434
Time deposits | 635,175,084 | 648,675,440
Derivative financial instruments | 2,063,000 | 1,174,000
Level 1 [Member] |  |
Assets: |  |
Cash and cash equivalents | 132,994,000 | 115,822,000
Securities available-for-sale, at fair value | 0 | 0
Liabilities: |  |
Derivative financial instruments | 0 | 0
Level 2 [Member] |  |
Assets: |  |
Securities available-for-sale, at fair value | 198,273,000 | 201,688,000
Liabilities: |  |
Noninterest-bearing demand deposits | 329,095,000 | 319,861,000
Interest-bearing demand deposits | 331,629,000 | 311,482,000
Money Market and Savings deposits | 698,431,000 | 641,945,000
Time deposits | 635,272,000 | 649,169,000
Securities sold under agreements to repurchase | 7,070,000 | 11,756,000
Federal Home Loan Bank advances and other borrowings | 8,605,000 | 11,243,000
Derivative financial instruments | 2,063,000 | 1,174,000
Level 3 [Member] |  |
Assets: |  |
Securities available-for-sale, at fair value | 0 | 0
Loans, net | 1,824,680,000 | 1,766,838,000
Liabilities: |  |
Subordinated debt | 37,606,000 | 39,190,000
Derivative financial instruments | 0 | 0
Carrying Amount [Member] |  |
Assets: |  |
Cash and cash equivalents | 132,994,000 | 115,822,000
Securities available-for-sale, at fair value | 198,273,000 | 201,688,000
Restricted investments | 12,398,000 | 11,499,000
Loans, net | 1,831,865,000 | 1,768,964,000
Liabilities: |  |
Noninterest-bearing demand deposits | 329,095,000 | 319,861,000
Interest-bearing demand deposits | 331,629,000 | 311,482,000
Money Market and Savings deposits | 698,431,000 | 641,945,000
Time deposits | 635,175,000 | 648,675,000
Securities sold under agreements to repurchase | 7,070,000 | 11,756,000
Federal Home Loan Bank advances and other borrowings | 8,605,000 | 11,243,000
Subordinated debt | 39,198,000 | 39,177,000
Derivative financial instruments |  | 1,174,000
Estimated Fair Value [Member] |  |
Assets: |  |
Cash and cash equivalents | 132,994,000 | 115,822,000
Securities available-for-sale, at fair value | 198,273,000 | 201,688,000
Loans, net | 1,824,680,000 | 1,766,838,000
Liabilities: |  |
Noninterest-bearing demand deposits | 329,095,000 | 319,861,000
Interest-bearing demand deposits | 331,629,000 | 311,482,000
Money Market and Savings deposits | 698,431,000 | 641,945,000
Time deposits | 635,272,000 | 649,169,000
Securities sold under agreements to repurchase | 7,070,000 | 11,756,000
Federal Home Loan Bank advances and other borrowings | 8,605,000 | 11,243,000
Subordinated debt | 37,606,000 | 39,190,000
Derivative financial instruments | $ 2,063,000 | $ 1,174,000

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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