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
Mar. 31, 2025
Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 172,491 $ 183,814
Less than 12 Months, Unrealized Losses (2,085) (2,542)
More than 12 Months, Fair Value 1,682,990 1,696,552
More than 12 Months, Unrealized Losses (385,460) (403,433)
Total, Fair Value 1,855,481 1,880,366
Unrealized Losses, Total (387,545) (405,975)
US Government Agencies Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 0 1,935
Less than 12 Months, Unrealized Losses 0 (2)
More than 12 Months, Fair Value 1,094 1,286
More than 12 Months, Unrealized Losses (13) (25)
Total, Fair Value 1,094 3,221
Unrealized Losses, Total (13) (27)
US States and Political Subdivisions Debt Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 6,008 6,560
Less than 12 Months, Unrealized Losses (377) (322)
More than 12 Months, Fair Value 434,789 444,056
More than 12 Months, Unrealized Losses (137,351) (129,381)
Total, Fair Value 440,797 450,616
Unrealized Losses, Total (137,728) (129,703)
Corporate Bond Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 195 8,620
Less than 12 Months, Unrealized Losses (1) (27)
More than 12 Months, Fair Value 152,758 145,655
More than 12 Months, Unrealized Losses (7,533) (9,292)
Total, Fair Value 152,953 154,275
Unrealized Losses, Total (7,534) (9,319)
Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 34,482 56,155
Less than 12 Months, Unrealized Losses (939) (1,547)
More than 12 Months, Fair Value 181,760 181,990
More than 12 Months, Unrealized Losses (42,594) (45,241)
Total, Fair Value 216,242 238,145
Unrealized Losses, Total (43,533) (46,788)
Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 131,806 110,544
Less than 12 Months, Unrealized Losses (768) (644)
More than 12 Months, Fair Value 912,589 923,565
More than 12 Months, Unrealized Losses (197,969) (219,494)
Total, Fair Value 1,044,395 1,034,109
Unrealized Losses, Total (198,737) (220,138)
Agency Securities [Member] | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 15,166 31,291
Less than 12 Months, Unrealized Losses (83) (359)
More than 12 Months, Fair Value 161,498 160,880
More than 12 Months, Unrealized Losses (41,527) (44,319)
Total, Fair Value 176,664 192,171
Unrealized Losses, Total (41,610) (44,678)
Agency Securities [Member] | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 108,671 104,477
Less than 12 Months, Unrealized Losses (571) (546)
More than 12 Months, Fair Value 886,146 895,714
More than 12 Months, Unrealized Losses (195,106) (216,208)
Total, Fair Value 994,817 1,000,191
Unrealized Losses, Total (195,677) (216,754)
Non-agency | Commercial Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 19,316 24,864
Less than 12 Months, Unrealized Losses (856) (1,188)
More than 12 Months, Fair Value 20,262 21,110
More than 12 Months, Unrealized Losses (1,067) (922)
Total, Fair Value 39,578 45,974
Unrealized Losses, Total (1,923) (2,110)
Non-agency | Residential Mortgage-Backed Securities [Member]    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 23,135 6,067
Less than 12 Months, Unrealized Losses (197) (98)
More than 12 Months, Fair Value 26,443 27,851
More than 12 Months, Unrealized Losses (2,863) (3,286)
Total, Fair Value 49,578 33,918
Unrealized Losses, Total $ (3,060) $ (3,384)