Annual report pursuant to Section 13 and 15(d)

Note 3 - Debt Securities - Amortized Cost and Fair Value of Available for Sale and Held to Maturity Securities (Details)

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Note 3 - Debt Securities - Amortized Cost and Fair Value of Available for Sale and Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Available for sale, amortized cost $ 538,381 $ 423,330
Available for sale, gross unrealized gain 3,221 3,033
Available for sale, gross unrealized loss (3,522) (3,988)
Available for sale, fair value 538,080 422,375
Held to maturity, amortized cost 250 62,564
Held to maturity, gross unrealized gain 1,010
Held to maturity, gross unrealized loss 272
Held to maturity debt securities, fair value 250 63,302
Available for sale, gross unrealized loss 3,522 3,988
Held to maturity, gross unrealized loss (272)
US Treasury and Government [Member]    
Available for sale, amortized cost 55,567 45,998
Available for sale, gross unrealized gain 38 382
Available for sale, gross unrealized loss (249) (126)
Available for sale, fair value 55,356 46,254
Available for sale, gross unrealized loss 249 126
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 278,177 228,843
Available for sale, gross unrealized gain 1,006 1,515
Available for sale, gross unrealized loss (2,685) (3,168)
Available for sale, fair value 276,498 227,190
Held to maturity, amortized cost   19,164
Held to maturity, gross unrealized gain   321
Held to maturity, gross unrealized loss   245
Held to maturity debt securities, fair value   19,240
Available for sale, gross unrealized loss 2,685 3,168
Held to maturity, gross unrealized loss   (245)
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 134,641 139,504
Available for sale, gross unrealized gain 761 1,120
Available for sale, gross unrealized loss (553) (694)
Available for sale, fair value 134,849 139,930
Held to maturity, amortized cost 250 5,888
Held to maturity, gross unrealized gain 315
Held to maturity, gross unrealized loss 12
Held to maturity debt securities, fair value 250 6,191
Available for sale, gross unrealized loss 553 694
Held to maturity, gross unrealized loss (12)
Corporate Debt Securities [Member]    
Available for sale, amortized cost 69,996 8,985
Available for sale, gross unrealized gain 1,416 16
Available for sale, gross unrealized loss (35)
Available for sale, fair value 71,377 9,001
Held to maturity, amortized cost   37,512
Held to maturity, gross unrealized gain   374
Held to maturity, gross unrealized loss   15
Held to maturity debt securities, fair value   37,871
Available for sale, gross unrealized loss $ 35
Held to maturity, gross unrealized loss   $ (15)