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)

v3.19.3
Note 11 - Fair Value Measurement - Financial Assets and Financial Liabilities Carried at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-for-sale securities $ 688,021 $ 590,184 [1]
US Treasury Securities [Member]    
Available-for-sale securities 52,198 58,428
US Government Agencies Debt Securities [Member]    
Available-for-sale securities 18,361 18,565
Collateralized Mortgage Backed Securities [Member]    
Available-for-sale securities 402,639 304,304
US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 65,568 105,994
Corporate Debt Securities [Member]    
Available-for-sale securities 149,255 102,893
Fair Value, Recurring [Member]    
Available-for-sale securities 688,021 590,184
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Available-for-sale securities 52,198 58,428
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale securities 18,361 18,565
Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Available-for-sale securities 402,639 304,304
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 65,568 105,994
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Available-for-sale securities 149,255 102,893
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Available-for-sale securities 0 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 681,411 583,666
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Available-for-sale securities 52,198 58,428
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available-for-sale securities 18,361 18,565
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]    
Available-for-sale securities 402,639 304,304
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale securities 65,568 105,994
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Available-for-sale securities 142,645 96,375
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Available-for-sale securities 6,610 6,518
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 $ 6,610 $ 6,518
[1] Derived from audited financial statements.