Annual report pursuant to Section 13 and 15(d)

Note 21 - Fair Value Measurement - Financial Assets and Financial Liabilities Carried at Fair Value on a Recurring Basis (Details)

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Note 21 - Fair Value Measurement - Financial Assets and Financial Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt securities available for sale $ 759,399 $ 590,184
US Treasury Securities [Member]    
Debt securities available for sale 49,210 58,428
US Government Agencies Debt Securities [Member]    
Debt securities available for sale 18,386 18,565
Collateralized Mortgage Backed Securities [Member]    
Debt securities available for sale 474,054 304,304
US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale 57,272 105,994
Corporate Debt Securities [Member]    
Debt securities available for sale 160,477 102,893
Fair Value, Recurring [Member]    
Debt securities available for sale 759,399 590,184
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Debt securities available for sale 49,210 58,428
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Debt securities available for sale 18,386 18,565
Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt securities available for sale 474,054 304,304
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale 57,272 105,994
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt securities available for sale 160,477 102,893
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Debt securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Debt securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt securities available for sale 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Debt securities available for sale 752,803 583,666
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Debt securities available for sale 49,210 58,428
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Debt securities available for sale 18,386 18,565
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt securities available for sale 474,054 304,304
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale 57,272 105,994
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt securities available for sale 153,881 96,375
Fair Value, Inputs, Level 3 [Member]    
Debt securities available for sale 6,596 6,518
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Debt securities available for sale 6,596 6,518
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Debt securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt securities available for sale $ 6,596 $ 6,518