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Note 7 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Temporarily impaired securities, less than 12 months, fair value $ 142,983 $ 176,667
Temporarily impaired securities, less than 12 months, unrealized losses 262 630
Temporarily impaired securities, 12 months or longer, fair value 910,288 899,523
Temporarily impaired securities, 12 months or longer, unrealized losses 15,089 26,370
Temporarily impaired securities, total fair value 1,053,271 1,076,190
Temporarily impaired securities, total unrealized losses 15,351 27,000
US Treasury Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 99,779 124,751
Temporarily impaired securities, less than 12 months, unrealized losses 11 51
Temporarily impaired securities, 12 months or longer, fair value
Temporarily impaired securities, 12 months or longer, unrealized losses
Temporarily impaired securities, total fair value 99,779 124,751
Temporarily impaired securities, total unrealized losses 11 51
US Government Corporations and Agencies Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 3,388
Temporarily impaired securities, less than 12 months, unrealized losses 77
Temporarily impaired securities, 12 months or longer, fair value 4,577 2,483
Temporarily impaired securities, 12 months or longer, unrealized losses 166 118
Temporarily impaired securities, total fair value 4,577 5,871
Temporarily impaired securities, total unrealized losses 166 195
US Government-sponsored Enterprises Debt Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value
Temporarily impaired securities, less than 12 months, unrealized losses
Temporarily impaired securities, 12 months or longer, fair value 393,274 388,362
Temporarily impaired securities, 12 months or longer, unrealized losses 6,726 11,637
Temporarily impaired securities, total fair value 393,274 388,362
Temporarily impaired securities, total unrealized losses 6,726 11,637
Collateralized Mortgage Backed Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 3,437 48,528
Temporarily impaired securities, less than 12 months, unrealized losses 18 502
Temporarily impaired securities, 12 months or longer, fair value 511,556 507,701
Temporarily impaired securities, 12 months or longer, unrealized losses 8,173 14,587
Temporarily impaired securities, total fair value 514,993 556,229
Temporarily impaired securities, total unrealized losses 8,191 15,089
Collateralized Mortgage Obligations [Member]    
Temporarily impaired securities, less than 12 months, fair value
Temporarily impaired securities, less than 12 months, unrealized losses
Temporarily impaired securities, 12 months or longer, fair value 881 977
Temporarily impaired securities, 12 months or longer, unrealized losses 24 28
Temporarily impaired securities, total fair value 881 977
Temporarily impaired securities, total unrealized losses 24 $ 28
Corporate Debt Securities [Member]    
Temporarily impaired securities, less than 12 months, fair value 39,767  
Temporarily impaired securities, less than 12 months, unrealized losses 233  
Temporarily impaired securities, 12 months or longer, fair value  
Temporarily impaired securities, 12 months or longer, unrealized losses  
Temporarily impaired securities, total fair value 39,767  
Temporarily impaired securities, total unrealized losses $ 233