Annual report pursuant to Section 13 and 15(d)

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

v3.22.4
Note 1 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended 24 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Total $ 1,034,121,000 $ 462,957,000   $ 1,034,121,000    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Ending Balance 0 0   $ 0    
Number of Reporting Units       1    
Advertising Expense 447,000 499,000 $ 338,000      
Retained Earnings (Accumulated Deficit), Ending Balance 1,109,902,000 911,008,000 [1]   $ 1,109,902,000    
Loans and Leases Receivable, Allowance, Ending Balance 146,297,000 116,660,000 [1] $ 87,942,000 146,297,000   $ 76,584,000
Deferred Income Tax Assets, Net, Total 60,448,000 37,772,000 [1]   60,448,000    
Loans and Leases Receivable, Gross, Total 11,687,968,000 9,532,934,000   11,687,968,000    
Commercial Real Estate Portfolio Segment [Member]            
Loans and Leases Receivable, Gross, Total 3,145,317,000 2,984,053,000   3,145,317,000    
Real Estate Portfolio Segment[Member]            
Loans and Leases Receivable, Gross, Total 6,943,861,000 5,378,952,000   6,943,861,000    
Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Loans and Leases Receivable, Gross, Total 1,532,388,000 $ 1,103,076,000   1,532,388,000    
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     $ 13,600,000    
Minimum [Member]            
Property, Plant and Equipment, Useful Life (Year)       3 years    
Lessee, Operating Lease, Renewal Term (Year) 1 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     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%          
[1] derived from audited financial statements.