Quarterly report [Sections 13 or 15(d)]

SECURITIES AND OTHER INVESTMENTS (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details)

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SECURITIES AND OTHER INVESTMENTS (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 673,237 $ 183,814
Less than 12 Months, Unrealized Losses (3,801) (2,542)
More than 12 Months, Fair Value 1,659,851 1,696,552
More than 12 Months, Unrealized Losses (340,361) (403,433)
Total, Fair Value 2,333,088 1,880,366
Unrealized Losses, Total (344,162) (405,975)
US Government Agencies Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 11,861 1,935
Less than 12 Months, Unrealized Losses (22) (2)
More than 12 Months, Fair Value 862 1,286
More than 12 Months, Unrealized Losses (12) (25)
Total, Fair Value 12,723 3,221
Unrealized Losses, Total (34) (27)
US States and Political Subdivisions Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 3,711 6,560
Less than 12 Months, Unrealized Losses (38) (322)
More than 12 Months, Fair Value 454,035 444,056
More than 12 Months, Unrealized Losses (117,400) (129,381)
Total, Fair Value 457,746 450,616
Unrealized Losses, Total (117,438) (129,703)
Corporate Bond Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 47,770 8,620
Less than 12 Months, Unrealized Losses (69) (27)
More than 12 Months, Fair Value 107,271 145,655
More than 12 Months, Unrealized Losses (5,125) (9,292)
Total, Fair Value 155,041 154,275
Unrealized Losses, Total (5,194) (9,319)
Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 94,586 56,155
Less than 12 Months, Unrealized Losses (511) (1,547)
More than 12 Months, Fair Value 183,084 181,990
More than 12 Months, Unrealized Losses (42,418) (45,241)
Total, Fair Value 277,670 238,145
Unrealized Losses, Total (42,929) (46,788)
Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 515,309 110,544
Less than 12 Months, Unrealized Losses (3,161) (644)
More than 12 Months, Fair Value 914,599 923,565
More than 12 Months, Unrealized Losses (175,406) (219,494)
Total, Fair Value 1,429,908 1,034,109
Unrealized Losses, Total (178,567) (220,138)
Agency Securities [Member] | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 60,304 31,291
Less than 12 Months, Unrealized Losses (232) (359)
More than 12 Months, Fair Value 158,881 160,880
More than 12 Months, Unrealized Losses (40,594) (44,319)
Total, Fair Value 219,185 192,171
Unrealized Losses, Total (40,826) (44,678)
Agency Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 447,134 104,477
Less than 12 Months, Unrealized Losses (2,598) (546)
More than 12 Months, Fair Value 887,972 895,714
More than 12 Months, Unrealized Losses (173,115) (216,208)
Total, Fair Value 1,335,106 1,000,191
Unrealized Losses, Total (175,713) (216,754)
Non-agency | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 34,282 24,864
Less than 12 Months, Unrealized Losses (279) (1,188)
More than 12 Months, Fair Value 24,203 21,110
More than 12 Months, Unrealized Losses (1,824) (922)
Total, Fair Value 58,485 45,974
Unrealized Losses, Total (2,103) (2,110)
Non-agency | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 68,175 6,067
Less than 12 Months, Unrealized Losses (563) (98)
More than 12 Months, Fair Value 26,627 27,851
More than 12 Months, Unrealized Losses (2,291) (3,286)
Total, Fair Value 94,802 33,918
Unrealized Losses, Total $ (2,854) $ (3,384)