Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details)

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Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Available for sale, amortized cost $ 804,755 $ 752,181
Available for sale, gross unrealized gain 22,541 8,726
Available for sale, gross unrealized loss (514) (1,508)
Available for sale, fair value 826,782 759,399 [1]
Held to maturity, amortized cost 250 250
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss 0 0
Held to maturity debt securities, fair value 250 250
US Treasury Securities [Member]    
Available for sale, amortized cost 48,956 48,923
Available for sale, gross unrealized gain 826 291
Available for sale, gross unrealized loss 0 (4)
Available for sale, fair value 49,782 49,210
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost 18,188 18,245
Available for sale, gross unrealized gain 405 143
Available for sale, gross unrealized loss 0 (2)
Available for sale, fair value 18,593 18,386
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 529,126 470,513
Available for sale, gross unrealized gain 17,305 4,859
Available for sale, gross unrealized loss 0 (1,318)
Available for sale, fair value 546,431 474,054
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 50,989 56,951
Available for sale, gross unrealized gain 353 335
Available for sale, gross unrealized loss (14) (14)
Available for sale, fair value 51,328 57,272
Held to maturity, amortized cost 250 250
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss 0 0
Held to maturity debt securities, fair value 250 250
Corporate Debt Securities [Member]    
Available for sale, amortized cost 157,496 157,549
Available for sale, gross unrealized gain 3,652 3,098
Available for sale, gross unrealized loss (500) (170)
Available for sale, fair value $ 160,648 $ 160,477
[1] derived from audited financial statements.