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Note 2 - Investment Securities - Gross Unrealized Losses, Investment Securities Portfolio (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Available for sale securities, less than 12 months, number of investment positions 39 376
Available for sale securities, less than 12 months, fair value $ 440,504 $ 2,673,207
Available for sale securities, less than 12 months, unrealized losses $ (8,946) $ (225,835)
Available for sale securities, 12 months or longer, number of investment positions 394 93
Available for sale securities, 12 months or longer, fair value $ 3,047,766 $ 757,794
Available for sale securities, 12 months or longer, unrealized losses $ (262,561) $ (139,388)
Available for sale securities, total, number of investment positions 433 469
Available for sale securities, total, fair value $ 3,488,270 $ 3,431,001
Available for sale securities, total, unrealized losses $ (271,507) $ (365,223)
Held to Maturity securities, less than 12 months, number of investment positions 27 200
Held to Maturity securities, less than 12 months, fair value $ 45,166 $ 821,756
Held to Maturity securities, less than 12 months, unrecognized losses $ (1,274) $ (42,390)
Held to Maturity securities, 12 months or longer, number of investment positions 165 2
Held to Maturity securities, 12 months or longer, fair value $ 739,440 $ 682
Held to Maturity securities, 12 months or longer, unrecognized losses $ (27,709) $ (99)
Held to Maturity securities, total, number of investment positions 192 202
Held to Maturity securities, total, fair value $ 784,606 $ 822,438
Held to Maturity securities, total, unrecognized losses $ (28,983) $ (42,489)
Agency Residential MBS [Member]    
Available for sale securities, less than 12 months, number of investment positions 1 107
Available for sale securities, less than 12 months, fair value $ 115 $ 279,139
Available for sale securities, less than 12 months, unrealized losses $ (2) $ (24,222)
Available for sale securities, 12 months or longer, number of investment positions 107 9
Available for sale securities, 12 months or longer, fair value $ 238,642 $ 6,110
Available for sale securities, 12 months or longer, unrealized losses $ (18,700) $ (823)
Available for sale securities, total, number of investment positions 108 116
Available for sale securities, total, fair value $ 238,757 $ 285,249
Available for sale securities, total, unrealized losses $ (18,702) $ (25,045)
Held to Maturity securities, less than 12 months, number of investment positions 1 97
Held to Maturity securities, less than 12 months, fair value $ 0 $ 95,814
Held to Maturity securities, less than 12 months, unrecognized losses $ 0 $ (7,404)
Held to Maturity securities, 12 months or longer, number of investment positions 93 2
Held to Maturity securities, 12 months or longer, fair value $ 72,376 $ 682
Held to Maturity securities, 12 months or longer, unrecognized losses $ (5,270) $ (99)
Held to Maturity securities, total, number of investment positions 94 99
Held to Maturity securities, total, fair value $ 72,376 $ 96,496
Held to Maturity securities, total, unrecognized losses $ (5,270) $ (7,503)
US Government Agencies Debt Securities [Member]    
Available for sale securities, less than 12 months, number of investment positions 2 22
Available for sale securities, less than 12 months, fair value $ 9,746 $ 289,067
Available for sale securities, less than 12 months, unrealized losses $ (15) $ (15,486)
Available for sale securities, 12 months or longer, number of investment positions 19 0
Available for sale securities, 12 months or longer, fair value $ 278,265 $ 0
Available for sale securities, 12 months or longer, unrealized losses $ (13,836) $ 0
Available for sale securities, total, number of investment positions 21 22
Available for sale securities, total, fair value $ 288,011 $ 289,067
Available for sale securities, total, unrealized losses $ (13,851) $ (15,486)
US States and Political Subdivisions Debt Securities [Member]    
Available for sale securities, less than 12 months, number of investment positions 2 56
Available for sale securities, less than 12 months, fair value $ 2,280 $ 65,633
Available for sale securities, less than 12 months, unrealized losses $ (15) $ (1,902)
Available for sale securities, 12 months or longer, number of investment positions 50 8
Available for sale securities, 12 months or longer, fair value $ 57,614 $ 3,265
Available for sale securities, 12 months or longer, unrealized losses $ (1,423) $ (177)
Available for sale securities, total, number of investment positions 52 64
Available for sale securities, total, fair value $ 59,894 $ 68,898
Available for sale securities, total, unrealized losses $ (1,438) $ (2,079)
Held to Maturity securities, less than 12 months, number of investment positions 23 54
Held to Maturity securities, less than 12 months, fair value $ 18,599 $ 53,536
Held to Maturity securities, less than 12 months, unrecognized losses $ (90) $ (538)
Held to Maturity securities, 12 months or longer, number of investment positions 26 0
Held to Maturity securities, 12 months or longer, fair value $ 25,466 $ 0
Held to Maturity securities, 12 months or longer, unrecognized losses $ (245) $ 0
Held to Maturity securities, total, number of investment positions 49 54
Held to Maturity securities, total, fair value $ 44,065 $ 53,536
Held to Maturity securities, total, unrecognized losses $ (335) $ (538)
Corporate Debt Securities [Member]    
Available for sale securities, less than 12 months, number of investment positions 0 133
Available for sale securities, less than 12 months, fair value $ 0 $ 1,521,294
Available for sale securities, less than 12 months, unrealized losses $ 0 $ (170,453)
Available for sale securities, 12 months or longer, number of investment positions 151 56
Available for sale securities, 12 months or longer, fair value $ 1,894,602 $ 555,727
Available for sale securities, 12 months or longer, unrealized losses $ (220,035) $ (137,190)
Available for sale securities, total, number of investment positions 151 189
Available for sale securities, total, fair value $ 1,894,602 $ 2,077,021
Available for sale securities, total, unrealized losses $ (220,035) $ (307,643)
Held to Maturity securities, less than 12 months, number of investment positions 3 49
Held to Maturity securities, less than 12 months, fair value $ 26,567 $ 672,406
Held to Maturity securities, less than 12 months, unrecognized losses $ (1,184) $ (34,448)
Held to Maturity securities, 12 months or longer, number of investment positions 46 0
Held to Maturity securities, 12 months or longer, fair value $ 641,598 $ 0
Held to Maturity securities, 12 months or longer, unrecognized losses $ (22,194) $ 0
Held to Maturity securities, total, number of investment positions 49 49
Held to Maturity securities, total, fair value $ 668,165 $ 672,406
Held to Maturity securities, total, unrecognized losses $ (23,378) $ (34,448)
Collateralized Debt Obligations [Member]    
Available for sale securities, less than 12 months, number of investment positions 34 58
Available for sale securities, less than 12 months, fair value $ 428,363 $ 518,074
Available for sale securities, less than 12 months, unrealized losses $ (8,914) $ (13,772)
Available for sale securities, 12 months or longer, number of investment positions 67 20
Available for sale securities, 12 months or longer, fair value $ 578,643 $ 192,692
Available for sale securities, 12 months or longer, unrealized losses $ (8,567) $ (1,198)
Available for sale securities, total, number of investment positions 101 78
Available for sale securities, total, fair value $ 1,007,006 $ 710,766
Available for sale securities, total, unrealized losses $ (17,481) $ (14,970)