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Note 3 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Temporarily impaired securities, less than 12 months, fair value $ 137,572 $ 144,339
Temporarily impaired securities, less than 12 months, unrealized losses 423 231
Temporarily impaired securities, 12 months or longer, fair value 48,295 349,366
Temporarily impaired securities, 12 months or longer, fair value 1,036 1,509
Temporarily impaired securities, total fair value 185,867 493,705
Temporarily impaired securities, total unrealized losses 1,459 1,740
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  
US Government Corporations and Agencies Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 26,390 48,829
Temporarily impaired securities, less than 12 months, unrealized losses 102 172
Temporarily impaired securities, 12 months or longer, fair value 40,009 3,570
Temporarily impaired securities, 12 months or longer, fair value 444 147
Temporarily impaired securities, total fair value 66,399 52,399
Temporarily impaired securities, total unrealized losses 546 319
US Government-sponsored Enterprises Debt Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value   0
Temporarily impaired securities, less than 12 months, unrealized losses   0
Temporarily impaired securities, 12 months or longer, fair value   224,443
Temporarily impaired securities, 12 months or longer, fair value   557
Temporarily impaired securities, total fair value   224,443
Temporarily impaired securities, total unrealized losses   557
Collateralized Mortgage Backed Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 1,694 43,719
Temporarily impaired securities, less than 12 months, unrealized losses 23 36
Temporarily impaired securities, 12 months or longer, fair value 8,093 120,801
Temporarily impaired securities, 12 months or longer, fair value 583 788
Temporarily impaired securities, total fair value 9,787 164,520
Temporarily impaired securities, total unrealized losses 606 824
Collateralized Mortgage Obligations [Member]    
Temporarily impaired securities, less than 12 months, fair value 10,131 0
Temporarily impaired securities, less than 12 months, unrealized losses 25 0
Temporarily impaired securities, 12 months or longer, fair value 193 552
Temporarily impaired securities, 12 months or longer, fair value 9 17
Temporarily impaired securities, total fair value 10,324 552
Temporarily impaired securities, total unrealized losses 34 17
Corporate Debt Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 58,405 51,791
Temporarily impaired securities, less than 12 months, unrealized losses 267 23
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 58,405 51,791
Temporarily impaired securities, total unrealized losses $ 267 $ 23