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, 2021
Dec. 31, 2020
Available for sale, amortized cost $ 940,728 $ 861,156
Available for sale, gross unrealized gain 24,414 26,054
Available for sale, gross unrealized loss (3,263) (522)
Available for sale, fair value 961,879 886,688 [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 [1]
US Treasury Securities [Member]    
Available for sale, amortized cost 13,995 13,993
Available for sale, gross unrealized gain 301 364
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 14,296 14,357
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost 12,020 15,228
Available for sale, gross unrealized gain 170 230
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 12,190 15,458
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 558,985 477,407
Available for sale, gross unrealized gain 13,352 17,720
Available for sale, gross unrealized loss (2,795) (18)
Available for sale, fair value 569,542 495,109
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 33,408 37,671
Available for sale, gross unrealized gain 303 444
Available for sale, gross unrealized loss (189) 0
Available for sale, fair value 33,522 38,115
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 322,320 316,857
Available for sale, gross unrealized gain 10,288 7,296
Available for sale, gross unrealized loss (279) (504)
Available for sale, fair value $ 332,329 $ 323,649
[1] derived from audited financial statements.