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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Temporarily impaired securities, less than 12 months, fair value $ 358,495 $ 137,572
Temporarily impaired securities, less than 12 months, unrealized losses 3,775 423
Temporarily impaired securities, 12 months or longer, fair value 19,973 48,295
Temporarily impaired securities, 12 months or longer, fair value 1,071 1,036
Temporarily impaired securities, total fair value 378,468 185,867
Temporarily impaired securities, total unrealized losses 4,846 1,459
US Government Corporations and Agencies Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 0 26,390
Temporarily impaired securities, less than 12 months, unrealized losses 0 102
Temporarily impaired securities, 12 months or longer, fair value 2,475 40,009
Temporarily impaired securities, 12 months or longer, fair value 137 444
Temporarily impaired securities, total fair value 2,475 66,399
Temporarily impaired securities, total unrealized losses 137 546
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 298,310 1,694
Temporarily impaired securities, less than 12 months, unrealized losses 3,159 23
Temporarily impaired securities, 12 months or longer, fair value 7,583 8,093
Temporarily impaired securities, 12 months or longer, fair value 677 583
Temporarily impaired securities, total fair value 305,893 9,787
Temporarily impaired securities, total unrealized losses 3,836 606
Collateralized Mortgage Obligations [Member]    
Temporarily impaired securities, less than 12 months, fair value 9,574 10,131
Temporarily impaired securities, less than 12 months, unrealized losses 264 25
Temporarily impaired securities, 12 months or longer, fair value 162 193
Temporarily impaired securities, 12 months or longer, fair value 10 9
Temporarily impaired securities, total fair value 9,736 10,324
Temporarily impaired securities, total unrealized losses 274 34
Corporate Debt Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 50,611 58,405
Temporarily impaired securities, less than 12 months, unrealized losses 352 267
Temporarily impaired securities, 12 months or longer, fair value 9,753 0
Temporarily impaired securities, 12 months or longer, fair value 247 0
Temporarily impaired securities, total fair value 60,364 58,405
Temporarily impaired securities, total unrealized losses $ 599 $ 267