Annual report [Section 13 and 15(d), not S-K Item 405]

Note 20 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details)

v3.25.4
Note 20 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Cash and cash equivalents $ 95,127 $ 116,394
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 660,076 714,853
Federal funds sold 6,052 1,045
Mortgage loans held for sale 11,744 9,211
Restricted equity securities 12,203 11,300
Federal funds purchased 1,471,628 1,993,728
US Treasury Securities [Member]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 249,621 249,403
Reported Value Measurement [Member]    
Cash and cash equivalents 1,121,734 2,375,589
Securities purchased with agreement to resell 498,910  
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 410,455 465,450
Federal funds sold 6,052 1,045
Mortgage loans held for sale 11,744 9,211
Restricted equity securities 12,203 11,300
Loans, net 13,525,229 12,441,378
Deposits 14,219,034 13,543,459
Federal funds purchased 1,471,628 1,993,728
Other borrowings 34,750 64,743
Reported Value Measurement [Member] | US Treasury Securities [Member]    
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss 249,621 249,403
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 1,121,734 2,375,589
Securities purchased with agreement to resell 498,910  
Held to maturity debt securities 376,503 409,725
Federal funds sold 6,052 1,045
Mortgage loans held for sale 11,744 9,211
Restricted equity securities 12,203 11,300
Loans, net 13,267,169 12,013,721
Deposits 14,217,711 13,540,438
Federal funds purchased 1,471,628 1,993,728
Other borrowings 31,258 59,130
Estimate of Fair Value Measurement [Member] | US Treasury Securities [Member]    
Held to maturity debt securities 240,032 229,771
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 1,121,734 2,375,589
Securities purchased with agreement to resell 498,910  
Federal funds sold 0 0
Mortgage loans held for sale 0 0
Restricted equity securities 0 0
Loans, net 0 0
Deposits 0 0
Federal funds purchased 0 0
Other borrowings 0 0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]    
Held to maturity debt securities 240,032 229,771
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents 0 0
Securities purchased with agreement to resell 0  
Held to maturity debt securities 376,003 409,475
Federal funds sold 6,052 1,045
Mortgage loans held for sale 11,744 9,211
Restricted equity securities 12,203 11,300
Loans, net 0 0
Deposits 14,217,711 13,540,438
Federal funds purchased 1,471,628 1,993,728
Other borrowings 31,258 59,130
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0 0
Securities purchased with agreement to resell 0  
Federal funds sold 0 0
Mortgage loans held for sale 0 0
Restricted equity securities 0 0
Loans, net 13,267,169 12,013,721
Deposits 0 0
Federal funds purchased 0 0
Other borrowings $ 0 $ 0