Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details)

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Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt securities available for sale, less than twelve months, gross unrealized losses $ (6,225) $ (22,258)
Debt securities available for sale, less than twelve months, fair value 287,586 372,749
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (77,910) (40,309)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 495,986 260,400
Debt Securities, Available for Sale, Gross Unrealized Losses (84,135) (62,567)
Debt Securities, Available for Sale, Fair Value 783,572 633,149
Debt Securities held to maturity less than twelve months, gross unrealized losses (627) (44,573)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 59,261 578,572
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (92,836) (53,603)
U.S. Treasury Securities 900,556 352,742
Debt Securities, Held To Maturity , Gross Unrealized Losses (93,464) (98,175)
Debt Securities,Held To Maturity, Fair Value 959,817 931,314
US Treasury Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (63) (33)
Debt securities available for sale, less than twelve months, fair value 214,652 2,969
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 0 0
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 0 0
Debt Securities, Available for Sale, Gross Unrealized Losses (63) (33)
Debt Securities, Available for Sale, Fair Value 214,652 2,969
Debt Securities held to maturity less than twelve months, gross unrealized losses (6) (12,662)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 49,020 295,383
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (34,252) (23,537)
U.S. Treasury Securities 473,806 175,570
Debt Securities, Held To Maturity , Gross Unrealized Losses (34,258) (36,197)
Debt Securities,Held To Maturity, Fair Value 522,826 470,953
US Government Agencies Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 0 0
Debt securities available for sale, less than twelve months, fair value 4 9
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 0 0
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 0 0
Debt Securities, Available for Sale, Gross Unrealized Losses 0 0
Debt Securities, Available for Sale, Fair Value 4 9
Collateralized Mortgage-Backed Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (19) (3,473)
Debt securities available for sale, less than twelve months, fair value 1,097 60,234
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (31,490) (29,309)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 228,603 189,109
Debt Securities, Available for Sale, Gross Unrealized Losses (31,510) (32,782)
Debt Securities, Available for Sale, Fair Value 229,700 249,343
Debt Securities held to maturity less than twelve months, gross unrealized losses (621) (31,367)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 10,241 278,746
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (57,681) (29,592)
U.S. Treasury Securities 419,852 174,842
Debt Securities, Held To Maturity , Gross Unrealized Losses (58,302) (60,960)
Debt Securities,Held To Maturity, Fair Value 430,093 453,588
US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (24) (186)
Debt securities available for sale, less than twelve months, fair value 2,176 5,283
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (1,423) (1,411)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 9,342 7,880
Debt Securities, Available for Sale, Gross Unrealized Losses (1,447) (1,597)
Debt Securities, Available for Sale, Fair Value 11,518 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 (904) (474)
U.S. Treasury Securities 6,898 2,330
Debt Securities, Held To Maturity , Gross Unrealized Losses (904) (1,018)
Debt Securities,Held To Maturity, Fair Value 6,898 6,773
Corporate Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (6,118) (18,566)
Debt securities available for sale, less than twelve months, fair value 69,657 304,254
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (44,996) (9,589)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 258,041 63,411
Debt Securities, Available for Sale, Gross Unrealized Losses (51,115) (28,155)
Debt Securities, Available for Sale, Fair Value $ 327,698 $ 367,666