Annual report pursuant to Section 13 and 15(d)

Note 3 - Debt Securities - Amortized Cost and Fair Value of Contractual Securities (Details)

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Note 3 - Debt Securities - Amortized Cost and Fair Value of Contractual Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available for sale, amortized cost $ 538,381 $ 423,330
Available for sale, fair value 538,080 422,375
Held to maturity, amortized cost 250 62,564
Held to maturity debt securities, fair value 250 63,302
Due Within One Year [Member]    
Available for sale, amortized cost 22,122 28,270
Available for sale, fair value 22,172 28,400
Due from One to Five Years [Member]    
Available for sale, amortized cost 160,773 152,347
Available for sale, fair value 160,563 153,003
Held to maturity, amortized cost 250 250
Held to maturity debt securities, fair value 250 250
Due from Five to Ten Years [Member]    
Available for sale, amortized cost 73,362 13,870
Available for sale, fair value 74,684 13,782
Held to maturity, amortized cost 34,251
Held to maturity debt securities, fair value 34,617
Due After Ten Years [Member]    
Available for sale, amortized cost 3,947
Available for sale, fair value 4,163
Held to maturity, amortized cost 8,899
Held to maturity debt securities, fair value 9,195
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 278,177 228,843
Available for sale, fair value 276,498 227,190
Held to maturity, amortized cost 19,164
Held to maturity debt securities, fair value $ 19,240