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Note 2 - Sales/Mergers/Acquisitions - Additional Information (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2018 | Oct. 01, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Premises and equipment |  |  |  | $ 6,092,000 | $ 4,808,000
Core deposit intangible |  |  |  | $ 10,064,000 | 2,698,000
PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Remaining life of loan (in months) |  |  | 8 months | 8 months |
Springfield Bancshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Premises and equipment | $ 6,092 |  |  |  |
Core deposit intangible | $ 8,209 |  |  |  |
Springfield Bancshares | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Nonaccretable discount recognized |  |  | $ 0 | $ 0 |
Amount accreted to income |  |  | $ 153,000 |  |
Guaranty Bank and Trust Company [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Premises and equipment |  | $ 4,808,000 |  |  |
Core deposit intangible |  | $ 2,698,000 |  |  |
Guaranty Bank and Trust Company [Member] | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Nonaccretable discount recognized |  |  |  | $ 137,000 | $ 158,000
Five Branch Locations [Member] | Guaranty Bank and Trust Company [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Property, plant and equipment, useful life |  | 39 years |  |  |
Ten Branch Locations [Member] | Springfield Bancshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Property, plant and equipment, useful life | 39 years |  |  |  |
Ten Branch Locations [Member] | Guaranty Bank and Trust Company [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Core deposit intangible |  | $ 4,600,000 |  |  |
Core Deposits [Member] | Springfield Bancshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 10 years |  |  |  |
Core deposit intangible | $ 8,200,000 |  |  |  |
Core Deposits [Member] | Guaranty Bank and Trust Company [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  | 10 years |  |  |

X
- Definition The amount of nonaccretable discount recognized due to repayment of purchased loans where credit was impaired. + References No definition available. + Details
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- Definition Amount of increase (decrease) of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans accounted for as debt securities, with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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