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Note 2 - Securities - Available-for-sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Due within 1 year, amortized cost $ 222,639  
Due within 1 year, fair value 222,690  
Due after 1 but within 5 years, amortized cost 80,328  
Due after 1 but within 5 years, fair value 80,586  
Due after 5 but within 10 years, amortized cost 15,689  
Due after 5 but within 10 years, fair value 15,626  
Due after 10 years, amortized cost 101,534  
Due after 10 years, fair value 101,812  
Mortgage-backed securities – government agencies, amortized cost 155,933  
Mortgage-backed securities – government agencies, fair value 154,874  
Corporate equity securities, amortized cost 653  
Corporate equity securities, fair value 703  
Total securities available-for-sale, amortized cost 576,776 $ 571,936
Total securities available-for-sale, fair value $ 576,291 $ 570,074