Annual report pursuant to Section 13 and 15(d)

Note 2 - Debt Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details)

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Note 2 - Debt Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Available for sale, amortized cost $ 596,225 $ 538,381
Available for sale, gross unrealized gain 1,545 3,221
Available for sale, gross unrealized loss (7,586) (3,522)
Available for sale, fair value 590,184 538,080
Held to maturity, amortized cost 250
Held to maturity, gross unrealized gain  
Held to maturity, gross unrealized loss  
Held to maturity debt securities, fair value 250
US Treasury and Government [Member]    
Available for sale, amortized cost 77,534 55,567
Available for sale, gross unrealized gain 78 38
Available for sale, gross unrealized loss (619) (249)
Available for sale, fair value 76,993 55,356
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 309,244 278,177
Available for sale, gross unrealized gain 591 1,006
Available for sale, gross unrealized loss (5,531) (2,685)
Available for sale, fair value 304,304 276,498
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 106,465 134,641
Available for sale, gross unrealized gain 208 761
Available for sale, gross unrealized loss (679) (553)
Available for sale, fair value 105,994 134,849
Held to maturity, amortized cost   250
Held to maturity, gross unrealized gain  
Held to maturity, gross unrealized loss  
Held to maturity debt securities, fair value   250
Corporate Debt Securities [Member]    
Available for sale, amortized cost 102,982 69,996
Available for sale, gross unrealized gain 668 1,416
Available for sale, gross unrealized loss (757) (35)
Available for sale, fair value $ 102,893 $ 71,377