v3.26.1
Note 3 - Debt Securities Available for Sale and Held to Maturity - Schedule of Estimated Fair Value of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt securities available for sale, amortized cost $ 3,749,144 $ 3,598,126
Debt securities available for sale, gross unrealized gains 1,279 2,081
Debt securities available for sale, gross unrealized losses (153,568) (131,473)
Debt securities available for sale 3,596,855 3,468,734
Held to Maturity, Amortized Cost 799,559 819,575
Held to Maturity, Gross Unrealized Gains 733 3,281
Held to Maturity, Gross Unrealized Losses (15,988) (10,276)
Held to Maturity, Fair Value 784,304 812,580
Total, amortized cost 4,548,703 4,417,701
Total, gross unrealized gains 2,012 5,362
Total, gross unrealized losses (169,556) (141,749)
Total, fair value 4,381,159 4,281,314
Agency Residential MBS [Member]    
Debt securities available for sale, amortized cost 187,993 194,394
Debt securities available for sale, gross unrealized gains 3 8
Debt securities available for sale, gross unrealized losses (10,688) (10,056)
Debt securities available for sale 177,308 184,346
Held to Maturity, Amortized Cost 41,271 43,734
Held to Maturity, Gross Unrealized Gains 23 26
Held to Maturity, Gross Unrealized Losses (2,311) (2,231)
Held to Maturity, Fair Value 38,983 41,529
Agency Commercial MBS [Member]    
Debt securities available for sale, amortized cost 955,794 709,371
Debt securities available for sale, gross unrealized gains 884 1,600
Debt securities available for sale, gross unrealized losses (10,564) (3,411)
Debt securities available for sale 946,114 707,560
US Government Agencies Debt Securities [Member]    
Debt securities available for sale, amortized cost 307,683 309,079
Debt securities available for sale, gross unrealized gains 26 72
Debt securities available for sale, gross unrealized losses (9,207) (6,739)
Debt securities available for sale 298,502 302,412
US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale, amortized cost 46,118 46,264
Debt securities available for sale, gross unrealized gains 6 1
Debt securities available for sale, gross unrealized losses (702) (543)
Debt securities available for sale 45,422 45,722
Held to Maturity, Amortized Cost 26,120 33,597
Held to Maturity, Gross Unrealized Gains 10 10
Held to Maturity, Gross Unrealized Losses (16) (36)
Held to Maturity, Fair Value 26,114 33,571
Corporate Debt Securities [Member]    
Debt securities available for sale, amortized cost 1,957,629 1,913,553
Debt securities available for sale, gross unrealized gains 9 0
Debt securities available for sale, gross unrealized losses (122,116) (109,473)
Debt securities available for sale 1,835,522 1,804,080
Held to Maturity, Amortized Cost 732,168 742,244
Held to Maturity, Gross Unrealized Gains 700 3,245
Held to Maturity, Gross Unrealized Losses (13,661) (8,009)
Held to Maturity, Fair Value 719,207 737,480
Collateralized Debt Obligations [Member]    
Debt securities available for sale, amortized cost 293,927 425,465
Debt securities available for sale, gross unrealized gains 351 400
Debt securities available for sale, gross unrealized losses (291) (1,251)
Debt securities available for sale $ 293,987 $ 424,614