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v3.20.1

Note 1 - Nature of Business and Significant Accounting Policies (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 27, 2017 | Dec. 31, 2019 USD ($) subsidiary shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Jan. 01, 2019
Number of subsidiaries commercial banks | subsidiary |  | 4 |  |  |
Number of Non-Consolidated Subsidiaries Issuing Trust Preferred Securities | subsidiary |  | 6 |  |  |
Cash Reserve Deposit Required and Made |  | $ 38,060,000 | $ 33,372,000 |  |
Initial Direct Leasing Costs As a Percentage of Cost |  | 5.50% |  |  |
Financing Receivable, Lines of Credit Maximum Term |  | 1 year |  |  |
Commercial Real Estate Owner Occupied, Percentage |  | 26.00% | 28.00% |  |
Lending Threshold Requiring Additional Loan Review |  | $ 1,000,000 |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  |  | $ 0 | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  | 365,084 | 358,270 | 354,269 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  | $ 10,200,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  | 9,700,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 303,000 | $ 365,000 | $ 1,000,000 |
Preferred stock, authorized (in shares) | shares |  | 250,000 | 250,000 |  |
Common stock, outstanding (in shares) | shares |  | 15,828,098 | 15,718,208 |  |
Allocated Share-based Compensation Expense |  | $ 2,469,000 | $ 1,443,000 | 1,187,000 |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Initial Direct Leasing Costs As a Percentage of Cost |  |  |  |  | 3.90%
Employee Stock Option |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 475,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 6 months 15 days |  |  |
Allocated Share-based Compensation Expense |  | $ 475,000 | 472,000 | 554,000 |
In The Money Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  | 394,592 |  |  |
Restricted Stock |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 3,100,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  | 2 years 2 months 12 days |  |  |
Allocated Share-based Compensation Expense |  | $ 1,850,000 | $ 857,000 | $ 553,000 |
Guaranty Bank and Trust Company [Member] |  |  |  |  |
Debt Instrument, Term | 4 years |  |  |  |
Bates Companies [Member] |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss |  | $ 3,000,000 |  |  |
Subsidiaries [Member] | Fixed Rate Residential Mortgage [Member] |  |  |  |  |
Financing Receivable, Term |  | 15 years |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Term Loans, Generally Maximum Term |  | 7 years |  |  |
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member] |  |  |  |  |
Loan and Leases Receivable, Lending Limits Percent |  | 300.00% |  |  |
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |
Loan and Leases Receivable, Lending Limits Percent |  | 100.00% |  |  |
Minimum |  |  |  |  |
Residual Value Percent of Cost |  | 3.00% |  |  |
Loan or lease portfolio, exposure to risk |  | $ 250,000 |  |  |
Increase in allowance for estimated losses on loans or leases (as a percent) |  | 5.00% |  |  |
Minimum | Subsidiaries [Member] | Adjustable Rate Residential Mortgage [Member] |  |  |  |  |
Financing Receivable, Term |  | 1 year |  |  |
Minimum | Commercial Portfolio Segment [Member] | Term Loan [Member] |  |  |  |  |
Financing Receivable, Term |  | 3 years |  |  |
Maximum |  |  |  |  |
Residual Value Percent of Cost |  | 25.00% |  |  |
Permanent loans term |  | 20 years |  |  |
Increase in allowance for estimated losses on loans or leases (as a percent) |  | 20.00% |  |  |
Maximum | Subsidiaries [Member] | Adjustable Rate Residential Mortgage [Member] |  |  |  |  |
Financing Receivable, Term |  | 5 years |  |  |
Maximum | Special Mention [Member] |  |  |  |  |
Financing Receivable, Credit Weaknesses Borrowers, Term |  | 365 days |  |  |
Maximum | Commercial Portfolio Segment [Member] | Term Loan [Member] |  |  |  |  |
Financing Receivable, Term |  | 5 years |  |  |
Core Deposits [Member] |  |  |  |  |
Estimated useful life |  | 10 years |  |  |
Customer Lists [Member] |  |  |  |  |
Estimated useful life |  | 15 years |  |  |

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