Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details)

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Note 10 - Fair Value Measurement - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis or Nonrecurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Cash and due from banks $ 79,431 $ 56,855 [1]
Available for sale debt securities 435,325 422,375 [1]
Held to maturity debt securities 87,399 62,564 [1]
Restricted equity securities 1,038 1,024 [1]
Federal funds sold 182,841 160,435 [1]
Mortgage loans held for sale 4,971 4,675 [1]
Bank owned life insurance contracts 126,722 114,388 [1]
Loans, net 5,570,306 4,859,877 [1]
Federal funds purchased 254,880 355,944 [1]
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]    
Cash and due from banks 166,150 623,562
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Cash and due from banks 166,150 623,562
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]    
Available for sale debt securities 435,325 422,375
Held to maturity debt securities 36,891 25,052
Restricted equity securities 1,038 1,024
Federal funds sold 182,841 160,435
Mortgage loans held for sale 4,971 4,675
Bank owned life insurance contracts 126,722 114,388
Deposits 5,796,901 5,420,311
Federal funds purchased 254,880 355,944
Other borrowings 54,975 55,262
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Available for sale debt securities 435,325 422,375
Held to maturity debt securities 37,406 25,431
Restricted equity securities 1,038 1,024
Federal funds sold 182,841 160,435
Mortgage loans held for sale 5,033 4,736
Bank owned life insurance contracts 126,722 114,388
Deposits 5,793,324 5,417,320
Federal funds purchased 254,880 355,944
Other borrowings 56,996 54,203
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]    
Held to maturity debt securities 50,508 37,512
Loans, net 5,570,306 4,859,877
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Held to maturity debt securities 51,923 37,871
Loans, net $ 5,564,250 $ 4,872,689
[1] Derived from audited financial statements