Annual report pursuant to Section 13 and 15(d)

Note 2 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details)

v3.24.0.1
Note 2 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt securities available for sale, less than twelve months, gross unrealized losses $ (801) $ (22,258)
Debt securities available for sale, less than twelve months, fair value 15,845 372,749
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (68,365) (40,309)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 535,836 260,400
Debt Securities, Available for Sale, Gross Unrealized Losses (69,166) (62,567)
Debt Securities, Available for Sale, Fair Value 551,681 633,149
Debt Securities held to maturity less than twelve months, gross unrealized losses (1) (44,573)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 430 578,572
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (75,474) (53,603)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 902,933 352,742
Debt Securities, Held To Maturity , Gross Unrealized Losses (75,475) (98,175)
Debt Securities,Held To Maturity, Fair Value 903,363 931,314
Collateralized Mortgage-Backed Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (6) (3,473)
Debt securities available for sale, less than twelve months, fair value 704 60,234
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (25,973) (29,309)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 214,393 189,109
Debt Securities, Available for Sale, Gross Unrealized Losses (25,979) (32,782)
Debt Securities, Available for Sale, Fair Value 215,097 249,343
Debt Securities held to maturity less than twelve months, gross unrealized losses (1) (31,367)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 430 278,746
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (50,024) (29,592)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 411,585 174,842
Debt Securities, Held To Maturity , Gross Unrealized Losses (50,025) (60,960)
Debt Securities,Held To Maturity, Fair Value 412,015 453,588
US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 0 (186)
Debt securities available for sale, less than twelve months, fair value 0 5,283
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (1,178) (1,411)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 9,777 7,880
Debt Securities, Available for Sale, Gross Unrealized Losses (1,178) (1,597)
Debt Securities, Available for Sale, Fair Value 9,777 13,163
Debt Securities held to maturity less than twelve months, gross unrealized losses 0 (544)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 0 4,443
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (732) (474)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 7,081 2,330
Debt Securities, Held To Maturity , Gross Unrealized Losses (732) (1,018)
Debt Securities,Held To Maturity, Fair Value 7,081 6,773
Corporate Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (794) (18,566)
Debt securities available for sale, less than twelve months, fair value 15,141 304,254
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (41,214) (9,589)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 311,666 63,411
Debt Securities, Available for Sale, Gross Unrealized Losses (42,009) (28,155)
Debt Securities, Available for Sale, Fair Value 326,807 367,666
US Treasury Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses   (33)
Debt securities available for sale, less than twelve months, fair value   2,969
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses   0
Debt Securities, Available for Sale, Twelve Months or More, Fair Value   0
Debt Securities, Available for Sale, Gross Unrealized Losses   (33)
Debt Securities, Available for Sale, Fair Value   2,969
Debt Securities held to maturity less than twelve months, gross unrealized losses 0 (12,662)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 0 295,383
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (24,718) (23,537)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 484,267 175,570
Debt Securities, Held To Maturity , Gross Unrealized Losses (24,718) (36,197)
Debt Securities,Held To Maturity, Fair Value $ 484,267 470,953
US Government Agencies Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses   0
Debt securities available for sale, less than twelve months, fair value   9
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses   0
Debt Securities, Available for Sale, Twelve Months or More, Fair Value   0
Debt Securities, Available for Sale, Gross Unrealized Losses   0
Debt Securities, Available for Sale, Fair Value   $ 9