Annual report [Section 13 and 15(d), not S-K Item 405]

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
Dec. 31, 2024
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 183,814 $ 205,602
Less than 12 Months, Unrealized Losses (2,542) (3,700)
More than 12 Months, Fair Value 1,696,552 1,862,395
More than 12 Months, Unrealized Losses (403,433) (382,167)
Total, Fair Value 1,880,366 2,067,997
Unrealized Losses, Total (405,975) (385,867)
US Government Agencies Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,935 0
Less than 12 Months, Unrealized Losses (2) 0
More than 12 Months, Fair Value 1,286 1,980
More than 12 Months, Unrealized Losses (25) (34)
Total, Fair Value 3,221 1,980
Unrealized Losses, Total (27) (34)
US States and Political Subdivisions Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 6,560 11,758
Less than 12 Months, Unrealized Losses (322) (2,090)
More than 12 Months, Fair Value 444,056 455,931
More than 12 Months, Unrealized Losses (129,381) (109,361)
Total, Fair Value 450,616 467,689
Unrealized Losses, Total (129,703) (111,451)
Corporate Bond Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 8,620 89,450
Less than 12 Months, Unrealized Losses (27) (531)
More than 12 Months, Fair Value 145,655 144,155
More than 12 Months, Unrealized Losses (9,292) (19,243)
Total, Fair Value 154,275 233,605
Unrealized Losses, Total (9,319) (19,774)
Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 56,155 35,665
Less than 12 Months, Unrealized Losses (1,547) (547)
More than 12 Months, Fair Value 181,990 208,435
More than 12 Months, Unrealized Losses (45,241) (42,599)
Total, Fair Value 238,145 244,100
Unrealized Losses, Total (46,788) (43,146)
Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 110,544 68,729
Less than 12 Months, Unrealized Losses (644) (532)
More than 12 Months, Fair Value 923,565 1,051,894
More than 12 Months, Unrealized Losses (219,494) (210,930)
Total, Fair Value 1,034,109 1,120,623
Unrealized Losses, Total (220,138) (211,462)
Agency Securities [Member] | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 31,291 35,665
Less than 12 Months, Unrealized Losses (359) (547)
More than 12 Months, Fair Value 160,880 143,657
More than 12 Months, Unrealized Losses (44,319) (40,634)
Total, Fair Value 192,171 179,322
Unrealized Losses, Total (44,678) (41,181)
Agency Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 104,477 59,707
Less than 12 Months, Unrealized Losses (546) (491)
More than 12 Months, Fair Value 895,714 1,011,809
More than 12 Months, Unrealized Losses (216,208) (205,144)
Total, Fair Value 1,000,191 1,071,516
Unrealized Losses, Total (216,754) (205,635)
Non-agency | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 24,864 0
Less than 12 Months, Unrealized Losses (1,188) 0
More than 12 Months, Fair Value 21,110 64,778
More than 12 Months, Unrealized Losses (922) (1,965)
Total, Fair Value 45,974 64,778
Unrealized Losses, Total (2,110) (1,965)
Non-agency | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 6,067 9,022
Less than 12 Months, Unrealized Losses (98) (41)
More than 12 Months, Fair Value 27,851 40,085
More than 12 Months, Unrealized Losses (3,286) (5,786)
Total, Fair Value 33,918 49,107
Unrealized Losses, Total $ (3,384) $ (5,827)