Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details)

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Note 11 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Cash and cash equivalents $ 142,372 $ 123,430 [1]
Held to maturity debt securities, fair value 673,023 907,191
Federal funds sold 3,542 100,575 [1]
Mortgage loans held for sale 8,453 5,074 [1]
Restricted equity securities 11,300 10,226 [1]
Net Loans 12,177,471 11,505,512 [1]
Federal funds purchased 1,542,623 1,256,724 [1]
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 1,756,689 2,030,513
Held to maturity debt securities, fair value 249,349 508,985
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 1,756,689 2,030,513
Held to maturity debt securities, fair value 233,123 484,267
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Held to maturity debt securities, fair value 478,981 473,429
Federal funds sold 3,542 100,575
Mortgage loans held for sale 8,453 5,071
Restricted equity securities 11,300 10,226
Deposits 13,146,529 13,273,511
Federal funds purchased 1,542,623 1,256,724
Other borrowings 64,741 64,735
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Held to maturity debt securities, fair value 439,650 422,674
Federal funds sold 3,542 100,575
Mortgage loans held for sale 8,453 5,071
Restricted equity securities 11,300 10,226
Deposits 13,145,438 13,266,640
Federal funds purchased 1,542,623 1,256,724
Other borrowings 58,861 58,083
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Held to maturity debt securities, fair value 250 250
Net Loans 12,177,471 11,505,512
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Held to maturity debt securities, fair value 250 250
Net Loans $ 11,826,898 $ 11,032,819
[1] Derived from audited financial statements.