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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Temporarily impaired securities, less than 12 months, fair value $ 253,241 $ 137,572
Temporarily impaired securities, less than 12 months, unrealized losses 5,263 423
Temporarily impaired securities, 12 months or longer, fair value 31,746 48,295
Temporarily impaired securities, 12 months or longer, fair value 890 1,036
Temporarily impaired securities, total fair value 284,987 185,867
Temporarily impaired securities, total unrealized losses 6,153 1,459
US Government Corporations and Agencies Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 12,930 26,390
Temporarily impaired securities, less than 12 months, unrealized losses 11 102
Temporarily impaired securities, 12 months or longer, fair value 23,662 40,009
Temporarily impaired securities, 12 months or longer, fair value 280 444
Temporarily impaired securities, total fair value 36,592 66,399
Temporarily impaired securities, total unrealized losses 291 546
US Treasury Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value   40,952
Temporarily impaired securities, less than 12 months, unrealized losses   6
Temporarily impaired securities, 12 months or longer, fair value   0
Temporarily impaired securities, 12 months or longer, fair value   0
Temporarily impaired securities, total fair value   40,952
Temporarily impaired securities, total unrealized losses   6
Collateralized Mortgage Backed Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 190,914 1,694
Temporarily impaired securities, less than 12 months, unrealized losses 4,638 23
Temporarily impaired securities, 12 months or longer, fair value 7,903 8,093
Temporarily impaired securities, 12 months or longer, fair value 601 583
Temporarily impaired securities, total fair value 198,817 9,787
Temporarily impaired securities, total unrealized losses 5,239 606
Collateralized Mortgage Obligations [Member]    
Temporarily impaired securities, less than 12 months, fair value 9,946 10,131
Temporarily impaired securities, less than 12 months, unrealized losses 65 25
Temporarily impaired securities, 12 months or longer, fair value 181 193
Temporarily impaired securities, 12 months or longer, fair value 9 9
Temporarily impaired securities, total fair value 10,127 10,324
Temporarily impaired securities, total unrealized losses 74 34
Corporate Debt Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 39,451 58,405
Temporarily impaired securities, less than 12 months, unrealized losses 549 267
Temporarily impaired securities, 12 months or longer, fair value 0 0
Temporarily impaired securities, 12 months or longer, fair value 0 0
Temporarily impaired securities, total fair value 39,451 58,405
Temporarily impaired securities, total unrealized losses $ 549 $ 267