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)

v3.20.2
Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Available for sale, amortized cost $ 889,272 $ 752,181
Available for sale, gross unrealized gain 24,738 8,726
Available for sale, gross unrealized loss (961) (1,508)
Available for sale debt securities, at fair value 913,049 759,399 [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 [1]
US Treasury Securities [Member]    
Available for sale, amortized cost 18,990 48,923
Available for sale, gross unrealized gain 436 291
Available for sale, gross unrealized loss 0 (4)
Available for sale debt securities, at fair value 19,426 49,210
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost 15,222 18,245
Available for sale, gross unrealized gain 299 143
Available for sale, gross unrealized loss 0 (2)
Available for sale debt securities, at fair value 15,521 18,386
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 500,251 470,513
Available for sale, gross unrealized gain 17,879 4,859
Available for sale, gross unrealized loss (68) (1,318)
Available for sale debt securities, at fair value 518,062 474,054
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 36,922 56,951
Available for sale, gross unrealized gain 486 335
Available for sale, gross unrealized loss 0 (14)
Available for sale debt securities, at fair value 37,408 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 317,887 157,549
Available for sale, gross unrealized gain 5,638 3,098
Available for sale, gross unrealized loss (893) (170)
Available for sale debt securities, at fair value $ 322,632 $ 160,477
[1] Derived from audited financial statements.