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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Temporarily impaired securities, less than 12 months, fair value $ 60,343 $ 176,667
Temporarily impaired securities, less than 12 months, unrealized losses 57 629
Temporarily impaired securities, 12 months or longer, fair value 763,721 899,523
Temporarily impaired securities, 12 months or longer, unrealized losses 4,368 26,371
Temporarily impaired securities, total fair value 824,064 1,076,190
Temporarily impaired securities, total unrealized losses 4,425 27,000
US Government Corporations and Agencies Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 23,606 3,388
Temporarily impaired securities, less than 12 months, unrealized losses 7 77
Temporarily impaired securities, 12 months or longer, fair value 4,334 2,483
Temporarily impaired securities, 12 months or longer, unrealized losses 151 118
Temporarily impaired securities, total fair value 27,940 5,871
Temporarily impaired securities, total unrealized losses 158 195
US Treasury Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value   124,751
Temporarily impaired securities, less than 12 months, unrealized losses   50
Temporarily impaired securities, 12 months or longer, fair value   0
Temporarily impaired securities, 12 months or longer, unrealized losses   0
Temporarily impaired securities, total fair value   124,751
Temporarily impaired securities, total unrealized losses   50
US Government-sponsored Enterprises Debt Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 0 0
Temporarily impaired securities, less than 12 months, unrealized losses 0 0
Temporarily impaired securities, 12 months or longer, fair value 398,340 388,362
Temporarily impaired securities, 12 months or longer, unrealized losses 1,660 11,638
Temporarily impaired securities, total fair value 398,340 388,362
Temporarily impaired securities, total unrealized losses 1,660 11,638
Collateralized Mortgage Backed Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 2,874 48,528
Temporarily impaired securities, less than 12 months, unrealized losses 7 502
Temporarily impaired securities, 12 months or longer, fair value 360,270 507,701
Temporarily impaired securities, 12 months or longer, unrealized losses 2,539 14,587
Temporarily impaired securities, total fair value 363,144 556,229
Temporarily impaired securities, total unrealized losses 2,546 15,089
Collateralized Mortgage Obligations [Member]    
Temporarily impaired securities, less than 12 months, fair value 0 0
Temporarily impaired securities, less than 12 months, unrealized losses 0 0
Temporarily impaired securities, 12 months or longer, fair value 777 977
Temporarily impaired securities, 12 months or longer, unrealized losses 18 28
Temporarily impaired securities, total fair value 777 977
Temporarily impaired securities, total unrealized losses 18 $ 28
Corporate Debt Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 33,863  
Temporarily impaired securities, less than 12 months, unrealized losses 43  
Temporarily impaired securities, 12 months or longer, fair value 0  
Temporarily impaired securities, 12 months or longer, unrealized losses 0  
Temporarily impaired securities, total fair value 33,863  
Temporarily impaired securities, total unrealized losses $ 43