Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Securities - Amortized Cost and Fair Value of Contractual Securities (Details)

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Note 4 - Securities - Amortized Cost and Fair Value of Contractual Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available for sale, amortized cost $ 433,712 $ 423,330
Available for sale, fair value 435,325 422,375
Held to maturity, amortized cost 87,399 62,564
Held to maturity debt securities, fair value 89,329 63,302
Due Within One Year [Member]    
Available for sale, amortized cost 25,961 28,270
Available for sale, fair value 26,035 28,400
Due from One to Five Years [Member]    
Available for sale, amortized cost 151,842 152,347
Available for sale, fair value 153,099 153,003
Held to maturity, amortized cost 3,250 250
Held to maturity debt securities, fair value 3,280 250
Due from Five to Ten Years [Member]    
Available for sale, amortized cost 12,054 13,870
Available for sale, fair value 12,058 13,782
Held to maturity, amortized cost 48,997 34,251
Held to maturity debt securities, fair value 50,450 34,617
Due After Ten Years [Member]    
Available for sale, amortized cost 390
Available for sale, fair value 390
Held to maturity, amortized cost 3,987 8,899
Held to maturity debt securities, fair value 4,220 9,195
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 243,465 228,843
Available for sale, fair value 243,743 227,190
Held to maturity, amortized cost 31,165 19,164
Held to maturity debt securities, fair value $ 31,379 $ 19,240