Quarterly report pursuant to Section 13 or 15(d)

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

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SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 266,222 $ 1,285,632
Less than 12 Months, Unrealized Losses (5,952) (140,392)
More than 12 Months, Fair Value 1,767,901 1,392,153
More than 12 Months, Unrealized Losses (517,456) (322,446)
Total, Fair Value 2,034,123 2,677,785
Unrealized Losses, Total (523,408) (462,838)
U.S. government and agency securities    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 59,568 2,594
Less than 12 Months, Unrealized Losses (349) (166)
More than 12 Months, Fair Value 2,169 59,269
More than 12 Months, Unrealized Losses (34) (8,087)
Total, Fair Value 61,737 61,863
Unrealized Losses, Total (383) (8,253)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 16,023 588,668
Less than 12 Months, Unrealized Losses (3,567) (86,895)
More than 12 Months, Fair Value 399,438 187,375
More than 12 Months, Unrealized Losses (166,313) (65,806)
Total, Fair Value 415,461 776,043
Unrealized Losses, Total (169,880) (152,701)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 100,231 206,861
Less than 12 Months, Unrealized Losses (776) (15,019)
More than 12 Months, Fair Value 142,587 17,121
More than 12 Months, Unrealized Losses (24,222) (2,580)
Total, Fair Value 242,818 223,982
Unrealized Losses, Total (24,998) (17,599)
Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 15,074 139,980
Less than 12 Months, Unrealized Losses (709) (9,255)
More than 12 Months, Fair Value 205,207 155,743
More than 12 Months, Unrealized Losses (52,155) (34,257)
Total, Fair Value 220,281 295,723
Unrealized Losses, Total (52,864) (43,512)
Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 75,326 347,529
Less than 12 Months, Unrealized Losses (551) (29,057)
More than 12 Months, Fair Value 1,018,500 972,645
More than 12 Months, Unrealized Losses (274,732) (211,716)
Total, Fair Value 1,093,826 1,320,174
Unrealized Losses, Total (275,283) (240,773)
Agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 15,074 73,362
Less than 12 Months, Unrealized Losses (709) (7,024)
More than 12 Months, Fair Value 135,725 127,193
More than 12 Months, Unrealized Losses (49,580) (32,244)
Total, Fair Value 150,799 200,555
Unrealized Losses, Total (50,289) (39,268)
Agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 55,550 328,590
Less than 12 Months, Unrealized Losses (461) (27,769)
More than 12 Months, Fair Value 972,755 929,581
More than 12 Months, Unrealized Losses (267,691) (206,192)
Total, Fair Value 1,028,305 1,258,171
Unrealized Losses, Total (268,152) (233,961)
Non-agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 0 66,618
Less than 12 Months, Unrealized Losses 0 (2,231)
More than 12 Months, Fair Value 69,482 28,550
More than 12 Months, Unrealized Losses (2,575) (2,013)
Total, Fair Value 69,482 95,168
Unrealized Losses, Total (2,575) (4,244)
Non-agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 19,776 18,939
Less than 12 Months, Unrealized Losses (90) (1,288)
More than 12 Months, Fair Value 45,745 43,064
More than 12 Months, Unrealized Losses (7,041) (5,524)
Total, Fair Value 65,521 62,003
Unrealized Losses, Total $ (7,131) $ (6,812)