Quarterly report pursuant to Section 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, 2024
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 169,346 $ 205,602
Less than 12 Months, Unrealized Losses (1,466) (3,700)
More than 12 Months, Fair Value 1,818,230 1,862,395
More than 12 Months, Unrealized Losses (342,329) (382,167)
Total, Fair Value 1,987,576 2,067,997
Unrealized Losses, Total (343,795) (385,867)
US Government Agencies Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
More than 12 Months, Fair Value 1,439 1,980
More than 12 Months, Unrealized Losses (26) (34)
Total, Fair Value 1,439 1,980
Unrealized Losses, Total (26) (34)
US States and Political Subdivisions Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,277 11,758
Less than 12 Months, Unrealized Losses (213) (2,090)
More than 12 Months, Fair Value 462,306 455,931
More than 12 Months, Unrealized Losses (111,628) (109,361)
Total, Fair Value 463,583 467,689
Unrealized Losses, Total (111,841) (111,451)
Corporate Bond Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 14,899 89,450
Less than 12 Months, Unrealized Losses (167) (531)
More than 12 Months, Fair Value 188,773 144,155
More than 12 Months, Unrealized Losses (12,350) (19,243)
Total, Fair Value 203,672 233,605
Unrealized Losses, Total (12,517) (19,774)
Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 42,757 35,665
Less than 12 Months, Unrealized Losses (702) (547)
More than 12 Months, Fair Value 188,392 208,435
More than 12 Months, Unrealized Losses (38,655) (42,599)
Total, Fair Value 231,149 244,100
Unrealized Losses, Total (39,357) (43,146)
Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 110,413 68,729
Less than 12 Months, Unrealized Losses (384) (532)
More than 12 Months, Fair Value 977,320 1,051,894
More than 12 Months, Unrealized Losses (179,670) (210,930)
Total, Fair Value 1,087,733 1,120,623
Unrealized Losses, Total (180,054) (211,462)
Agency Securities [Member] | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 25,224 35,665
Less than 12 Months, Unrealized Losses (86) (547)
More than 12 Months, Fair Value 148,257 143,657
More than 12 Months, Unrealized Losses (37,635) (40,634)
Total, Fair Value 173,481 179,322
Unrealized Losses, Total (37,721) (41,181)
Agency Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 94,214 59,707
Less than 12 Months, Unrealized Losses (288) (491)
More than 12 Months, Fair Value 947,499 1,011,809
More than 12 Months, Unrealized Losses (175,899) (205,144)
Total, Fair Value 1,041,713 1,071,516
Unrealized Losses, Total (176,187) (205,635)
Non-agency | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 17,533 0
Less than 12 Months, Unrealized Losses (616) 0
More than 12 Months, Fair Value 40,135 64,778
More than 12 Months, Unrealized Losses (1,020) (1,965)
Total, Fair Value 57,668 64,778
Unrealized Losses, Total (1,636) (1,965)
Non-agency | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 16,199 9,022
Less than 12 Months, Unrealized Losses (96) (41)
More than 12 Months, Fair Value 29,821 40,085
More than 12 Months, Unrealized Losses (3,771) (5,786)
Total, Fair Value 46,020 49,107
Unrealized Losses, Total $ (3,867) $ (5,827)