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, 2020
Dec. 31, 2019
Debt securities held to maturity $ 886,688 $ 759,399
Total assets at fair value 87,314 41,522
US Treasury Securities [Member]    
Debt securities held to maturity 14,357 49,210
US Government Agencies Debt Securities [Member]    
Debt securities held to maturity 15,458 18,386
Collateralized Mortgage Backed Securities [Member]    
Debt securities held to maturity 495,109 474,054
US States and Political Subdivisions Debt Securities [Member]    
Debt securities held to maturity 38,115 57,272
Corporate Debt Securities [Member]    
Debt securities held to maturity 323,649 160,477
Fair Value, Recurring [Member]    
Debt securities held to maturity 886,689 759,399
Total assets at fair value 886,828  
Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Interest rate cap derivative 139  
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Debt securities held to maturity 14,357 49,210
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Debt securities held to maturity 15,458 18,386
Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt securities held to maturity 495,109 474,054
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Debt securities held to maturity 38,115 57,272
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt securities held to maturity 323,650 160,477
Fair Value, Inputs, Level 1 [Member]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Debt securities held to maturity 0 0
Total assets at fair value 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Interest rate cap derivative 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Debt securities held to maturity 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Debt securities held to maturity 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt securities held to maturity 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Debt securities held to maturity 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt securities held to maturity 0 0
Fair Value, Inputs, Level 2 [Member]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Debt securities held to maturity 886,689 759,399
Total assets at fair value 886,828  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Interest rate cap derivative 139  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Debt securities held to maturity 14,357 49,210
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Debt securities held to maturity 15,458 18,386
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt securities held to maturity 495,109 474,054
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Debt securities held to maturity 38,115 57,272
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt securities held to maturity 323,650 160,477
Fair Value, Inputs, Level 3 [Member]    
Total assets at fair value 87,314 41,522
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Debt securities held to maturity 0 0
Total assets at fair value 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Interest rate cap derivative 0  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Debt securities held to maturity 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Debt securities held to maturity 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Debt securities held to maturity 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Debt securities held to maturity 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt securities held to maturity $ 0 $ 0