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Note 16 - Stock Based Compensation - (Details Textual)
12 Months Ended
Mar. 01, 2022
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2006
shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)         1,500,000
Stock Issued During Period, Shares, Issued for Services (in shares)   11,700 7,301 4,500  
Noninterest Expense Directors Fees | $   $ 972,000 $ 790,000 $ 464,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   143,908 0 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)   118,958      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares   $ 18.18      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value | $   $ 472,000 $ 1,300,000    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)   2 years 10 months 24 days 3 years 3 months 18 days    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)         10 years
Non-employee Directors [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares   $ 23.08 $ 23.35 $ 14.87  
Noninterest Expense Directors Fees | $   $ 120,000 $ 276,000 $ 57,000  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Vesting, Number of Equal Installments     3    
Share-Based Payment Arrangement, Expense | $   4,300,000 $ 2,600,000 2,400,000  
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $   3,700,000 $ 2,400,000 $ 1,600,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $   $ 3,700,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares   $ 26.34 $ 20.73 $ 24.79  
The 2017 Equity Incentive Plan [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)   400,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares from Acquisition (in shares) 143,908        
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   1,043,908      
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Gross (in shares)   572,588      
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)   471,320      
The 2017 Equity Incentive Plan [Member] | Former TCBI Employees [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   143,908