v3.25.2
Note 3 - Investment Securities - Amortized Cost, Unrealized Gains and Losses, and Estimated Fair Value of Investment Securities Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Debt securities available for sale, amortized cost $ 3,392,197 $ 3,634,471
Debt securities available for sale, gross unrealized gains 785 790
Debt securities available for sale, gross unrealized losses (166,533) (239,451)
Debt securities available for sale 3,226,449 3,395,810
Held to Maturity, Amortized Cost 834,440 844,635
Held to Maturity, Gross Unrealized Gains 1,193 35
Held to Maturity, Gross Unrealized Losses (17,914) (36,832)
Held to Maturity, Fair Value 817,719 807,838
Total, amortized cost 4,226,637 4,479,106
Total, gross unrealized gains 1,978 825
Total, gross unrealized losses (184,447) (276,283)
Total, fair value 4,044,168 4,203,648
Agency Residential MBS [Member]    
Debt securities available for sale, amortized cost 208,198 229,050
Debt securities available for sale, gross unrealized gains 1 1
Debt securities available for sale, gross unrealized losses (12,921) (17,991)
Debt securities available for sale 195,278 211,060
Held to Maturity, Amortized Cost 49,878 57,927
Held to Maturity, Gross Unrealized Gains 23 23
Held to Maturity, Gross Unrealized Losses (2,887) (4,218)
Held to Maturity, Fair Value 47,014 53,732
Agency Commercial MBS [Member]    
Debt securities available for sale, amortized cost 95,966 7,098
Debt securities available for sale, gross unrealized gains 364 0
Debt securities available for sale, gross unrealized losses (65) (132)
Debt securities available for sale 96,265 6,966
US Government Agencies Debt Securities [Member]    
Debt securities available for sale, amortized cost 312,417 311,201
Debt securities available for sale, gross unrealized gains 27 1
Debt securities available for sale, gross unrealized losses (10,541) (19,085)
Debt securities available for sale 301,903 292,117
US Treasury Securities [Member]    
Debt securities available for sale, amortized cost   4,945
Debt securities available for sale, gross unrealized gains   10
Debt securities available for sale, gross unrealized losses   0
Debt securities available for sale   4,955
US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale, amortized cost 61,987 63,878
Debt securities available for sale, gross unrealized gains 8 9
Debt securities available for sale, gross unrealized losses (1,160) (1,701)
Debt securities available for sale 60,835 62,186
Held to Maturity, Amortized Cost 45,716 51,261
Held to Maturity, Gross Unrealized Gains 8 12
Held to Maturity, Gross Unrealized Losses (131) (377)
Held to Maturity, Fair Value 45,593 50,896
Corporate Debt Securities [Member]    
Debt securities available for sale, amortized cost 1,931,579 2,031,144
Debt securities available for sale, gross unrealized gains 0 127
Debt securities available for sale, gross unrealized losses (139,558) (195,334)
Debt securities available for sale 1,792,021 1,835,937
Held to Maturity, Amortized Cost 738,846 735,447
Held to Maturity, Gross Unrealized Gains 1,162 0
Held to Maturity, Gross Unrealized Losses (14,896) (32,237)
Held to Maturity, Fair Value 725,112 703,210
Collateralized Debt Obligations [Member]    
Debt securities available for sale, amortized cost 782,050 987,155
Debt securities available for sale, gross unrealized gains 385 642
Debt securities available for sale, gross unrealized losses (2,288) (5,208)
Debt securities available for sale $ 780,147 $ 982,589