Annual report pursuant to Section 13 and 15(d)

Note 1 - Summary of Significant Accounting Policies (Details Textual)

v3.22.0.1
Note 1 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total $ 462,957,000 $ 250,000      
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Ending Balance $ 0        
Number of Reporting Units 1        
Advertising Expense $ 498,000 338,000 $ 581,000    
Retained Earnings (Accumulated Deficit), Ending Balance 911,008,000 748,224,000      
Loans and Leases Receivable, Allowance, Ending Balance 116,660,000 87,942,000 76,584,000   $ 68,600,000
Deferred Income Tax Assets, Net, Total 37,772,000 31,072,000      
Loans and Leases Receivable, Gross, Total 9,532,934,000 8,465,688,000      
Commercial Real Estate Portfolio Segment [Member]          
Loans and Leases Receivable, Allowance, Ending Balance 41,869,000 36,370,000 43,666,000    
Loans and Leases Receivable, Gross, Total 2,984,053,000 3,295,900,000      
Real Estate Portfolio Segment[Member]          
Loans and Leases Receivable, Gross, Total 5,378,952,000 4,511,304,000      
Real Estate Portfolio Segment[Member] | Construction Loans [Member]          
Loans and Leases Receivable, Allowance, Ending Balance 26,994,000 16,057,000 $ 2,768,000    
Loans and Leases Receivable, Gross, Total 1,103,076,000 $ 593,614,000      
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]          
Retained Earnings (Accumulated Deficit), Ending Balance       $ 1,100,000  
Loans and Leases Receivable, Allowance, Ending Balance       2,000,000.0  
Off-Balance Sheet, Credit Loss, Liability, Ending Balance       500,000,000,000  
Deferred Income Tax Assets, Net, Total       376,000,000,000  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Real Estate Portfolio Segment [Member]          
Loans and Leases Receivable, Gross, Total       8,200,000  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Real Estate Portfolio Segment[Member] | Construction Loans [Member]          
Loans and Leases Receivable, Gross, Total       $ 6,200,000  
Metro Bancshares, Inc [Member]          
Goodwill, Ending Balance $ 13,600,000        
Finite-Lived Intangible Asset, Useful Life (Year) 7 years        
Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year) 3 years        
Lessee, Operating Lease, Renewal Term (Year) 1 year        
Minimum [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Shares Vested Upon Certain Performance Metrics, Percentage 0.00%        
Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year) 39 years 6 months        
Lessee, Operating Lease, Renewal Term (Year) 5 years        
Maximum [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Shares Vested Upon Certain Performance Metrics, Percentage 150.00%