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Note 2 - Securities - Available-for-sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Due within 1 year, amortized cost $ 216,651  
Due within 1 year, fair value 216,696  
Due after 1 but within 5 years, amortized cost 74,383  
Due after 1 but within 5 years, fair value 74,529  
Due after 5 but within 10 years, amortized cost 14,085  
Due after 5 but within 10 years, fair value 14,031  
Due after 10 years, amortized cost 118,577  
Due after 10 years, fair value 119,030  
Mortgage-backed securities – government agencies, amortized cost 147,604  
Mortgage-backed securities – government agencies, fair value 146,720  
Corporate equity securities, amortized cost 653  
Corporate equity securities, fair value 516  
Total securities available-for-sale, amortized cost 571,953 $ 571,936
Total securities available-for-sale, fair value $ 571,522 $ 570,074