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, 2021
Dec. 31, 2020
Available for sale, amortized cost $ 830,546 $ 861,156
Available for sale, gross unrealized gain 15,426 26,054
Available for sale, gross unrealized loss (3,402) (522)
Available for sale, fair value 842,570 886,688
Held to maturity debt securities (fair value of $466,286 at December 31, 2021 and $250 at December 31, 2020) 462,957 250
Held to maturity, gross unrealized gain 5,278 0
Held to maturity, gross unrealized loss (1,949) 0
Held to maturity debt securities, fair value 466,286 250
US Treasury Securities [Member]    
Available for sale, amortized cost 9,003 13,993
Available for sale, gross unrealized gain 101 364
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 9,104 14,357
Held to maturity debt securities (fair value of $466,286 at December 31, 2021 and $250 at December 31, 2020) 149,263  
Held to maturity, gross unrealized gain 25  
Held to maturity, gross unrealized loss (668)  
Held to maturity debt securities, fair value 148,620  
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost 6,022 15,228
Available for sale, gross unrealized gain 19 230
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 6,041 15,458
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 424,372 477,407
Available for sale, gross unrealized gain 3,474 17,720
Available for sale, gross unrealized loss (2,685) (18)
Available for sale, fair value 425,161 495,109
Held to maturity debt securities (fair value of $466,286 at December 31, 2021 and $250 at December 31, 2020) 310,641  
Held to maturity, gross unrealized gain 5,251  
Held to maturity, gross unrealized loss (1,271)  
Held to maturity debt securities, fair value 314,621  
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 21,531 37,671
Available for sale, gross unrealized gain 173 444
Available for sale, gross unrealized loss (70) 0
Available for sale, fair value 21,634 38,115
Held to maturity debt securities (fair value of $466,286 at December 31, 2021 and $250 at December 31, 2020) 3,053 250
Held to maturity, gross unrealized gain 2 0
Held to maturity, gross unrealized loss (10) 0
Held to maturity debt securities, fair value 3,045 250
Corporate Debt Securities [Member]    
Available for sale, amortized cost 369,618 316,857
Available for sale, gross unrealized gain 11,659 7,296
Available for sale, gross unrealized loss (647) (504)
Available for sale, fair value $ 380,630 $ 323,649