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
Mar. 31, 2024
Dec. 31, 2023
Cash and cash equivalents $ 78,708 $ 123,430 [1]
Held to maturity debt securities, fair value 785,270 907,191
Federal funds sold 170,625 100,575 [1]
Mortgage loans held for sale 7,592 5,074 [1]
Restricted equity securities 11,300 10,226 [1]
Loans, net 11,724,804 11,505,512 [1]
Federal funds purchased 1,345,328 1,256,724 [1]
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 1,280,274 2,030,513
Held to maturity debt securities, fair value 393,932 508,985
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 1,280,274 2,030,513
Held to maturity debt securities, fair value 368,868 484,267
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Held to maturity debt securities, fair value 473,514 473,429
Federal funds sold 170,625 100,575
Mortgage loans held for sale 7,592 5,071
Restricted equity securities 11,300 10,226
Deposits 12,751,448 13,273,511
Federal funds purchased 1,345,328 1,256,724
Other borrowings 64,737 64,735
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Held to maturity debt securities, fair value 416,152 422,674
Federal funds sold 170,625 100,575
Mortgage loans held for sale 7,592 5,071
Restricted equity securities 11,300 10,226
Deposits 12,743,505 13,266,640
Federal funds purchased 1,345,328 1,256,724
Other borrowings 58,337 58,083
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Held to maturity debt securities, fair value 250 250
Loans, net 11,642,933 11,505,512
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Held to maturity debt securities, fair value 250 250
Loans, net $ 11,195,399 $ 11,032,819
[1] derived from audited financial statements.