Annual report pursuant to Section 13 and 15(d)

Note 2 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details)

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Note 2 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Less Than Twelve Months, Gross Unrealized Losses $ (1,386) $ (963)
Less Than Twelve Months, Fair Value 178,489 125,788
Twelve Months or More, Gross Unrealized Losses (122) (6,623)
Twelve Months or More, Fair Value 27,558 320,802
Total, Gross Unrealized Losses (1,508) (7,586)
Total, Fair Value 206,047 446,590
US Treasury Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (4) (8)
Less Than Twelve Months, Fair Value 3,012 1,001
Twelve Months or More, Gross Unrealized Losses 0 (388)
Twelve Months or More, Fair Value 0 32,449
Total, Gross Unrealized Losses (4) (397)
Total, Fair Value 3,012 34,206
US Government Agencies Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (2) 0
Less Than Twelve Months, Fair Value 266 0
Twelve Months or More, Gross Unrealized Losses 0 (223)
Twelve Months or More, Fair Value 0 18,429
Total, Gross Unrealized Losses (2) (222)
Total, Fair Value 266 17,673
Collateralized Mortgage Backed Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (1,206) (539)
Less Than Twelve Months, Fair Value 153,330 67,721
Twelve Months or More, Gross Unrealized Losses (112) (4,992)
Twelve Months or More, Fair Value 24,911 204,260
Total, Gross Unrealized Losses (1,318) (5,531)
Total, Fair Value 178,241 271,981
US States and Political Subdivisions Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (4) (101)
Less Than Twelve Months, Fair Value 1,900 20,821
Twelve Months or More, Gross Unrealized Losses (10) (578)
Twelve Months or More, Fair Value 2,647 52,190
Total, Gross Unrealized Losses (14) (679)
Total, Fair Value 4,547 73,011
Corporate Debt Securities [Member]    
Less Than Twelve Months, Gross Unrealized Losses (170) (315)
Less Than Twelve Months, Fair Value 19,981 36,245
Twelve Months or More, Gross Unrealized Losses 0 (442)
Twelve Months or More, Fair Value 0 13,474
Total, Gross Unrealized Losses (170) (757)
Total, Fair Value $ 19,981 $ 49,718