Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Fair Value Measurement - Financial Assets and Financial Liabilities Carried at Fair Value on a Recurring Basis (Details)

v3.21.1
Note 11 - Fair Value Measurement - Financial Assets and Financial Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale securities $ 961,879 $ 886,688 [1]
US Treasury Securities [Member]    
Available-for-sale securities 14,296 14,357
US Government Agencies Debt Securities [Member]    
Available-for-sale securities 12,190 15,458
Collateralized Mortgage Backed Securities [Member]    
Available-for-sale securities 569,542 495,109
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 33,522 38,115
Corporate Debt Securities [Member]    
Available-for-sale securities 332,329 323,649
Fair Value, Recurring [Member]    
Available-for-sale securities 961,879 886,688
Total assets at fair value 962,293 886,827
Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Interest rate cap derivative 414  
Fair Value, Recurring [Member] | Interest Rate Cap [Member]    
Interest rate cap derivative   139
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Available-for-sale securities 14,296 14,357
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale securities 12,190 15,458
Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Available-for-sale securities 569,542 495,109
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 33,522 38,115
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Available-for-sale securities 332,329 323,649
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Available-for-sale securities 0 0
Total assets at fair value 0 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] | Interest Rate Cap [Member]    
Interest rate cap derivative   0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Available-for-sale securities 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale securities 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Available-for-sale securities 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 0 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Available-for-sale securities 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Available-for-sale securities 951,578 886,688
Total assets at fair value 951,992 886,827
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member]    
Interest rate cap derivative 414  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Cap [Member]    
Interest rate cap derivative   139
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Available-for-sale securities 14,296 14,357
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale securities 12,190 15,458
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Available-for-sale securities 569,542 495,109
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 33,522 38,115
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Available-for-sale securities 322,028 323,649
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Available-for-sale securities 10,301 0
Total assets at fair value 10,301 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] | Interest Rate Cap [Member]    
Interest rate cap derivative   0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Available-for-sale securities 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale securities 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Available-for-sale securities 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Available-for-sale securities $ 10,301 $ 0
[1] derived from audited financial statements.