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Note 7 - Deposits - Components of Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Noninterest-bearing demand deposits $ 463,945 $ 454,143 [1]
Interest-bearing deposits:    
Interest-bearing demand deposits 459,376 465,407
Money market accounts 151,436 170,731
Savings deposits 343,685 342,064
Certificates of deposit 339,523 374,373
Individual retirement accounts 117,886 123,173
Total interest-bearing deposits 1,411,906 1,475,748 [1]
Total deposits $ 1,875,851 $ 1,929,891 [1]
[1] Derived from audited financial statements