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, 2019
Dec. 31, 2018
Cash and due from banks $ 108,804 $ 97,516 [1]
Federal funds sold 474,298 223,845 [1]
Mortgage loans held for sale 8,691 120 [1]
Held to maturity debt securities 250 0
Federal funds purchased 370,231 288,725 [1]
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and due from banks 572,429 458,050
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and due from banks 572,429 458,050
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Federal funds sold 474,298 223,845
Mortgage loans held for sale 8,691 120
Deposits 7,724,158 6,915,708
Federal funds purchased 370,231 288,725
Other borrowings 64,693 64,666
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Federal funds sold 474,298 223,845
Mortgage loans held for sale 8,656 121
Deposits 7,728,323 6,910,176
Federal funds purchased 370,231 288,725
Other borrowings 64,629 64,613
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Held to maturity debt securities 250 0
Loans, net 6,902,672 6,464,899
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Held to maturity debt securities 250 0
Loans, net $ 6,816,956 $ 6,398,604
[1] Derived from audited financial statements.