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Note 2 - Investment Securities - Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Securities available for sale, amortized cost $ 252,611 $ 266,437
Securities available for sale, gross unrealized gains 3,691 862
Securities available for sale, gross unrealized losses 1,274 5,458
Securities available for sale, fair value 255,028 261,841
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale, amortized cost 75,414 94,746
Securities available for sale, gross unrealized gains 52
Securities available for sale, gross unrealized losses 810 3,489
Securities available for sale, fair value 74,656 91,257
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale, amortized cost 43,911 33,222
Securities available for sale, gross unrealized gains 193 152
Securities available for sale, gross unrealized losses 307 382
Securities available for sale, fair value 43,797 32,992
US Government Agencies Debt Securities [Member]    
Securities available for sale, amortized cost 63,605 75,461
Securities available for sale, gross unrealized gains 536 59
Securities available for sale, gross unrealized losses 156 1,016
Securities available for sale, fair value 63,985 74,504
Municipal Notes [Member]    
Securities available for sale, amortized cost 69,681 63,008
Securities available for sale, gross unrealized gains 2,910 651
Securities available for sale, gross unrealized losses 1 571
Securities available for sale, fair value $ 72,590 $ 63,088