Quarterly report [Sections 13 or 15(d)]

Note 5 - Loans - Summary of Loans (Details)

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Note 5 - Loans - Summary of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Commercial, financial and agricultural $ 14,737,303   $ 13,696,912      
Less allowance for credit losses (189,010) $ (181,853) (171,683) $ (170,235) $ (169,959) $ (164,458)
Net Loans $ 14,548,293   $ 13,525,229      
Commercial, financial and agricultural 100.00%   100.00%      
Commercial Real Estate Portfolio Segment [Member]            
Commercial, financial and agricultural $ 3,386,275   $ 3,146,736      
Commercial, financial and agricultural 22.98%   22.97%      
Real Estate Portfolio Segment[Member]            
Commercial, financial and agricultural $ 9,711,991   $ 9,014,925      
Less allowance for credit losses (87,647) (88,416) (82,543) (66,983) (68,060) (67,726)
Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Commercial, financial and agricultural 1,566,203   1,457,628      
Less allowance for credit losses $ (37,157) (33,427) $ (22,432) (42,080) (46,423) (38,597)
Commercial, financial and agricultural 10.63%   10.64%      
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]            
Commercial, financial and agricultural $ 2,853,062   $ 2,739,823      
Less allowance for credit losses $ (18,875) (18,011) $ (18,833) (20,177) (20,927) (22,302)
Commercial, financial and agricultural 19.36%   20.00%      
Real Estate Portfolio Segment[Member] | One to Four Family [Member]            
Commercial, financial and agricultural $ 1,717,781   $ 1,671,713      
Less allowance for credit losses $ (22,038) (24,898) $ (24,739) (15,568) (14,944) (14,096)
Commercial, financial and agricultural 11.66%   12.21%      
Real Estate Portfolio Segment[Member] | Non-owner Occupied Commercial [Member]            
Commercial, financial and agricultural $ 5,141,148   $ 4,603,389      
Less allowance for credit losses $ (46,734) (45,507) $ (38,971) (31,238) (32,189) (31,328)
Commercial, financial and agricultural 34.88%   33.61%      
Real Estate Portfolio Segment[Member] | Other Mortgages [Member]            
Commercial, financial and agricultural     $ 9,014,925      
Commercial, financial and agricultural 65.90%   65.82%      
Consumer Portfolio Segment [Member]            
Commercial, financial and agricultural $ 72,834   $ 77,623      
Less allowance for credit losses $ (1,472) $ (2,765) $ (3,088) $ (3,075) $ (2,454) $ (2,805)
Commercial, financial and agricultural 0.49%   0.57%