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, 2019
Dec. 31, 2018
Available for sale, amortized cost $ 752,181 $ 596,225
Available for sale, gross unrealized gain 8,726 1,545
Available for sale, gross unrealized loss (1,508) (7,586)
Available for sale, fair value 759,399 590,184
Held to maturity, amortized cost 250 0
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss 0 0
Held to maturity debt securities, fair value 250 0
US Treasury Securities [Member]    
Available for sale, amortized cost 48,923 58,750
Available for sale, gross unrealized gain 291 75
Available for sale, gross unrealized loss (4) (397)
Available for sale, fair value 49,210 58,428
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost 18,245 18,784
Available for sale, gross unrealized gain 143 3
Available for sale, gross unrealized loss (2) (222)
Available for sale, fair value 18,386 18,565
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 470,513 309,244
Available for sale, gross unrealized gain 4,859 591
Available for sale, gross unrealized loss (1,318) (5,531)
Available for sale, fair value 474,054 304,304
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 56,951 106,465
Available for sale, gross unrealized gain 335 208
Available for sale, gross unrealized loss (14) (679)
Available for sale, fair value 57,272 105,994
Held to maturity, amortized cost 250 0
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss 0 0
Held to maturity debt securities, fair value 250 0
Corporate Debt Securities [Member]    
Available for sale, amortized cost 157,549 102,982
Available for sale, gross unrealized gain 3,098 668
Available for sale, gross unrealized loss (170) (757)
Available for sale, fair value $ 160,477 $ 102,893