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, 2026
Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 1,940,223 $ 536,063
Less than 12 Months, Unrealized Losses (59,984) (2,235)
More than 12 Months, Fair Value 1,469,741 1,666,987
More than 12 Months, Unrealized Losses (416,810) (313,266)
Total, Fair Value 3,409,964 2,203,050
Unrealized Losses, Total (476,794) (315,501)
US Government Agencies Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 26,920 6,689
Less than 12 Months, Unrealized Losses (217) (6)
More than 12 Months, Fair Value 584 737
More than 12 Months, Unrealized Losses (8) (8)
Total, Fair Value 27,504 7,426
Unrealized Losses, Total (225) (14)
US States and Political Subdivisions Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 25,441 25
Less than 12 Months, Unrealized Losses (1,622) 0
More than 12 Months, Fair Value 411,575 473,201
More than 12 Months, Unrealized Losses (154,919) (101,487)
Total, Fair Value 437,016 473,226
Unrealized Losses, Total (156,541) (101,487)
Corporate Bond Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 55,498 37,988
Less than 12 Months, Unrealized Losses (357) (75)
More than 12 Months, Fair Value 86,763 98,125
More than 12 Months, Unrealized Losses (2,154) (4,132)
Total, Fair Value 142,261 136,113
Unrealized Losses, Total (2,511) (4,207)
Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 156,124 83,707
Less than 12 Months, Unrealized Losses (4,901) (343)
More than 12 Months, Fair Value 178,057 183,430
More than 12 Months, Unrealized Losses (49,654) (41,368)
Total, Fair Value 334,181 267,137
Unrealized Losses, Total (54,555) (41,711)
Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,676,240 407,654
Less than 12 Months, Unrealized Losses (52,887) (1,811)
More than 12 Months, Fair Value 792,762 911,494
More than 12 Months, Unrealized Losses (210,075) (166,271)
Total, Fair Value 2,469,002 1,319,148
Unrealized Losses, Total (262,962) (168,082)
Agency Securities [Member] | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 88,131 44,536
Less than 12 Months, Unrealized Losses (3,557) (166)
More than 12 Months, Fair Value 141,332 161,001
More than 12 Months, Unrealized Losses (47,031) (39,640)
Total, Fair Value 229,463 205,537
Unrealized Losses, Total (50,588) (39,806)
Agency Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,578,691 359,095
Less than 12 Months, Unrealized Losses (49,454) (1,564)
More than 12 Months, Fair Value 759,657 886,626
More than 12 Months, Unrealized Losses (206,950) (163,960)
Total, Fair Value 2,338,348 1,245,721
Unrealized Losses, Total (256,404) (165,524)
Non-agency | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 67,993 39,171
Less than 12 Months, Unrealized Losses (1,344) (177)
More than 12 Months, Fair Value 36,725 22,429
More than 12 Months, Unrealized Losses (2,623) (1,728)
Total, Fair Value 104,718 61,600
Unrealized Losses, Total (3,967) (1,905)
Non-agency | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 97,549 48,559
Less than 12 Months, Unrealized Losses (3,433) (247)
More than 12 Months, Fair Value 33,105 24,868
More than 12 Months, Unrealized Losses (3,125) (2,311)
Total, Fair Value 130,654 73,427
Unrealized Losses, Total $ (6,558) $ (2,558)