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, 2022
Dec. 31, 2021
Cash and cash equivalents $ 103,439 $ 56,934 [1]
Federal funds sold 24,638 58,372 [1]
Held to maturity debt securities, fair value 799,347 466,286 [1]
Mortgage loans held for sale 403 1,114 [1]
Loans, net 9,779,494 9,416,274 [1]
Federal funds purchased 1,639,238 1,711,777 [1]
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and cash equivalents 3,418,751 4,163,724
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 3,418,751 4,163,724
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal funds sold 24,638 58,372
Held to maturity debt securities, fair value 833,304 462,707
Mortgage loans held for sale 403 1,114
Deposits 12,408,755 12,452,836
Federal funds purchased 1,639,238 1,711,777
Other borrowings 64,711 64,706
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal funds sold 24,638 58,372
Held to maturity debt securities, fair value 799,347 466,036
Mortgage loans held for sale 120 1,111
Deposits 12,418,183 12,454,140
Federal funds purchased 1,639,238 1,711,777
Other borrowings 65,548 65,476
Fair Value, Inputs, Level 3 [Member]    
Held to maturity debt securities, fair value 250 250
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Loans, net 9,779,494 9,416,274
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Loans, net $ 9,798,389 $ 9,403,012
[1] derived from audited financial statements.