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Note 3 - Investment Securities - Investment Securities Available for Sale (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of investment positions - less than twelve months 24 17
Gross unrealized losses - less than twelve months $ 24,264 $ 8,484
Fair value - less than twelve months $ 201 $ 27
Number of investment positions - more than twelve months 75 192
Gross unrealized losses - more than twelve months $ 93,852 $ 195,091
Fair value - more than twelve months $ 700 $ 5,431
Number of investment positions 99 209
Gross unrealized losses $ 118,116 $ 203,575
Fair value $ 901 $ 5,458
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Number of investment positions - less than twelve months 5 1
Gross unrealized losses - less than twelve months $ 723 $ 1,563
Fair value - less than twelve months $ 2 $ 13
Number of investment positions - more than twelve months 50 97
Gross unrealized losses - more than twelve months $ 49,033 $ 89,680
Fair value - more than twelve months $ 574 $ 3,476
Agency Collateralized Mortgage Obligations [Member]    
Number of investment positions - less than twelve months 13 4
Gross unrealized losses - less than twelve months $ 14,749 $ 2,870
Fair value - less than twelve months $ 157 $ 1
Number of investment positions - more than twelve months 15 24
Gross unrealized losses - more than twelve months $ 7,113 $ 12,168
Fair value - more than twelve months $ 64 $ 381
US Government Agencies Debt Securities [Member]    
Number of investment positions - less than twelve months 2 1
Gross unrealized losses - less than twelve months $ 5,551 $ 499
Fair value - less than twelve months $ 17 $ 1
Number of investment positions - more than twelve months 10 22
Gross unrealized losses - more than twelve months $ 37,706 $ 67,927
Fair value - more than twelve months $ 62 $ 1,015
US States and Political Subdivisions Debt Securities [Member]    
Number of investment positions - less than twelve months 4 11
Gross unrealized losses - less than twelve months $ 3,241 $ 3,552
Fair value - less than twelve months $ 25 $ 12
Number of investment positions - more than twelve months   49
Gross unrealized losses - more than twelve months   $ 25,316
Fair value - more than twelve months   $ 559