Quarterly report [Sections 13 or 15(d)]

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

v3.26.1
SECURITIES AND OTHER INVESTMENTS (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 815,063 $ 536,063
Less than 12 Months, Unrealized Losses (5,541) (2,235)
More than 12 Months, Fair Value 1,576,139 1,666,987
More than 12 Months, Unrealized Losses (327,587) (313,266)
Total, Fair Value 2,391,202 2,203,050
Unrealized Losses, Total (333,128) (315,501)
US Government Agencies Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 26,206 6,689
Less than 12 Months, Unrealized Losses (69) (6)
More than 12 Months, Fair Value 620 737
More than 12 Months, Unrealized Losses (8) (8)
Total, Fair Value 26,826 7,426
Unrealized Losses, Total (77) (14)
US States and Political Subdivisions Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 4,126 25
Less than 12 Months, Unrealized Losses (185) 0
More than 12 Months, Fair Value 455,363 473,201
More than 12 Months, Unrealized Losses (115,084) (101,487)
Total, Fair Value 459,489 473,226
Unrealized Losses, Total (115,269) (101,487)
Corporate Bond Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 61,260 37,988
Less than 12 Months, Unrealized Losses (202) (75)
More than 12 Months, Fair Value 82,663 98,125
More than 12 Months, Unrealized Losses (3,534) (4,132)
Total, Fair Value 143,923 136,113
Unrealized Losses, Total (3,736) (4,207)
Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 111,347 83,707
Less than 12 Months, Unrealized Losses (848) (343)
More than 12 Months, Fair Value 181,652 183,430
More than 12 Months, Unrealized Losses (41,559) (41,368)
Total, Fair Value 292,999 267,137
Unrealized Losses, Total (42,407) (41,711)
Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 612,124 407,654
Less than 12 Months, Unrealized Losses (4,237) (1,811)
More than 12 Months, Fair Value 855,841 911,494
More than 12 Months, Unrealized Losses (167,402) (166,271)
Total, Fair Value 1,467,965 1,319,148
Unrealized Losses, Total (171,639) (168,082)
Agency Securities [Member] | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 45,786 44,536
Less than 12 Months, Unrealized Losses (293) (166)
More than 12 Months, Fair Value 160,332 161,001
More than 12 Months, Unrealized Losses (39,760) (39,640)
Total, Fair Value 206,118 205,537
Unrealized Losses, Total (40,053) (39,806)
Agency Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 557,665 359,095
Less than 12 Months, Unrealized Losses (3,797) (1,564)
More than 12 Months, Fair Value 827,330 886,626
More than 12 Months, Unrealized Losses (165,065) (163,960)
Total, Fair Value 1,384,995 1,245,721
Unrealized Losses, Total (168,862) (165,524)
Non-agency | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 65,561 39,171
Less than 12 Months, Unrealized Losses (555) (177)
More than 12 Months, Fair Value 21,320 22,429
More than 12 Months, Unrealized Losses (1,799) (1,728)
Total, Fair Value 86,881 61,600
Unrealized Losses, Total (2,354) (1,905)
Non-agency | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 54,459 48,559
Less than 12 Months, Unrealized Losses (440) (247)
More than 12 Months, Fair Value 28,511 24,868
More than 12 Months, Unrealized Losses (2,337) (2,311)
Total, Fair Value 82,970 73,427
Unrealized Losses, Total $ (2,777) $ (2,558)