Quarterly report [Sections 13 or 15(d)]

Note 12 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details)

v3.25.3
Note 12 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Cash and cash equivalents $ 144,089 $ 116,394
Held to maturity debt securities, fair value 622,825 639,496
Federal funds sold 10,002 1,045
Mortgage loans held for sale 9,433 9,211
Restricted equity securities 12,203 11,300
Federal funds purchased 1,488,150 1,993,728
Reported Value Measurement [Member]    
Cash and cash equivalents 1,763,303 2,375,589
Federal funds sold 10,002 1,045
Mortgage loans held for sale 9,433 9,211
Restricted equity securities 12,203 11,300
Loans, net 13,141,732 12,441,378
Deposits 14,106,922 13,543,459
Federal funds purchased 1,488,150 1,993,728
Other borrowings 64,750 64,743
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Held to maturity debt securities, fair value 249,566 249,403
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Held to maturity debt securities, fair value 421,529 465,200
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Held to maturity debt securities, fair value 500 250
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 1,763,303 2,375,589
Federal funds sold 10,002 1,045
Mortgage loans held for sale 9,433 9,211
Restricted equity securities 12,203 11,300
Loans, net 12,885,745 12,013,721
Deposits 14,105,877 13,540,438
Federal funds purchased 1,488,150 1,993,728
Other borrowings 59,956 59,130
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 1,763,303 2,375,589
Held to maturity debt securities, fair value 238,131 229,771
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 2 [Member]    
Cash and cash equivalents 0 0
Held to maturity debt securities, fair value 384,194 409,475
Federal funds sold 10,002 1,045
Mortgage loans held for sale 9,433 9,211
Restricted equity securities 12,203 11,300
Loans, net 0 0
Deposits 14,105,877 13,540,438
Federal funds purchased 1,488,150 1,993,728
Other borrowings 59,956 59,130
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents 0 0
Held to maturity debt securities, fair value 500 250
Federal funds sold 0 0
Mortgage loans held for sale 0 0
Restricted equity securities 0 0
Loans, net 12,885,745 12,013,721
Deposits 0 0
Federal funds purchased 0 0
Other borrowings $ 0 $ 0