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, 2021
Dec. 31, 2020
Cash and due from banks $ 102,313 $ 93,655 [1]
Federal funds sold 44,700 1,771 [1]
Held to maturity debt securities, fair value 261,276 250 [1]
Mortgage loans held for sale 578 14,425 [1]
Net Loans 8,703,861 8,377,746 [1]
Federal funds purchased 1,286,756 851,545 [1]
Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 4,399,786 2,209,640
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Federal funds sold 44,700 1,771
Held to maturity debt securities, fair value 261,026 0
Mortgage loans held for sale 578 14,425
Deposits 12,078,670 9,975,724
Federal funds purchased 1,286,756 851,545
Other borrowings 64,701 64,748
Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Held to maturity debt securities, fair value 250 250
Net Loans 8,623,926 8,296,931
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and due from banks 4,399,786 2,209,640
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Federal funds sold 44,700 1,771
Held to maturity debt securities, fair value 261,026 0
Mortgage loans held for sale 574 14,497
Deposits 12,084,052 9,987,665
Federal funds purchased 1,286,756 851,545
Other borrowings 65,500 65,560
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Held to maturity debt securities, fair value 250 250
Net Loans $ 8,564,829 $ 8,387,718
[1] Derived from audited financial statements.