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
Mar. 31, 2023
Dec. 31, 2022
Debt securities available for sale, less than twelve months, gross unrealized losses $ (9,200) $ (22,258)
Debt securities available for sale, less than twelve months, fair value 175,163 372,749
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (54,261) (40,309)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 436,079 260,400
Debt Securities, Available for Sale, Gross Unrealized Losses (63,461) (62,567)
Debt Securities, Available for Sale, Fair Value 611,242 633,149
Debt Securities held to maturity less than twelve months, gross unrealized losses (4,323) (44,573)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 162,467 578,572
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (79,715) (53,603)
U.S. Treasury Securities 770,902 352,742
Debt Securities, Held To Maturity , Gross Unrealized Losses (84,038) (98,175)
Debt Securities,Held To Maturity, Fair Value 933,369 931,314
US Treasury Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 0 (33)
Debt securities available for sale, less than twelve months, fair value 0 2,969
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (11) 0
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 2,990 0
Debt Securities, Available for Sale, Gross Unrealized Losses (11) (33)
Debt Securities, Available for Sale, Fair Value 2,990 2,969
Debt Securities held to maturity less than twelve months, gross unrealized losses (2,678) (12,662)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 130,640 295,383
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (27,343) (23,537)
U.S. Treasury Securities 346,939 175,570
Debt Securities, Held To Maturity , Gross Unrealized Losses (30,021) (36,197)
Debt Securities,Held To Maturity, Fair Value 477,579 470,953
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 (364) (3,473)
Debt securities available for sale, less than twelve months, fair value 8,468 60,234
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (28,682) (29,309)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 233,956 189,109
Debt Securities, Available for Sale, Gross Unrealized Losses (29,046) (32,782)
Debt Securities, Available for Sale, Fair Value 242,424 249,343
Debt Securities held to maturity less than twelve months, gross unrealized losses (1,645) (31,367)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 31,827 278,746
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (51,545) (29,592)
U.S. Treasury Securities 416,994 174,842
Debt Securities, Held To Maturity , Gross Unrealized Losses (53,190) (60,960)
Debt Securities,Held To Maturity, Fair Value 448,821 453,588
US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (27) (186)
Debt securities available for sale, less than twelve months, fair value 3,328 5,283
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (1,310) (1,411)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 9,202 7,880
Debt Securities, Available for Sale, Gross Unrealized Losses (1,337) (1,597)
Debt Securities, Available for Sale, Fair Value 12,530 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 (827) (474)
U.S. Treasury Securities 6,969 2,330
Debt Securities, Held To Maturity , Gross Unrealized Losses (827) (1,018)
Debt Securities,Held To Maturity, Fair Value 6,969 6,773
Corporate Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (8,809) (18,566)
Debt securities available for sale, less than twelve months, fair value 163,363 304,254
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (24,258) (9,589)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 189,931 63,411
Debt Securities, Available for Sale, Gross Unrealized Losses (33,067) (28,155)
Debt Securities, Available for Sale, Fair Value $ 353,294 $ 367,666