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
Jun. 30, 2023
Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 154,673 $ 1,285,632
Less than 12 Months, Unrealized Losses (9,707) (140,392)
More than 12 Months, Fair Value 2,017,871 1,392,153
More than 12 Months, Unrealized Losses (440,465) (322,446)
Total, Fair Value 2,172,544 2,677,785
Unrealized Losses, Total (450,172) (462,838)
U.S. government and agency securities    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 0 2,594
Less than 12 Months, Unrealized Losses 0 (166)
More than 12 Months, Fair Value 61,311 59,269
More than 12 Months, Unrealized Losses (8,012) (8,087)
Total, Fair Value 61,311 61,863
Unrealized Losses, Total (8,012) (8,253)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 16,301 588,668
Less than 12 Months, Unrealized Losses (399) (86,895)
More than 12 Months, Fair Value 493,512 187,375
More than 12 Months, Unrealized Losses (136,149) (65,806)
Total, Fair Value 509,813 776,043
Unrealized Losses, Total (136,548) (152,701)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 17,735 206,861
Less than 12 Months, Unrealized Losses (1,801) (15,019)
More than 12 Months, Fair Value 122,437 17,121
More than 12 Months, Unrealized Losses (25,622) (2,580)
Total, Fair Value 140,172 223,982
Unrealized Losses, Total (27,423) (17,599)
Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 36,548 139,980
Less than 12 Months, Unrealized Losses (3,970) (9,255)
More than 12 Months, Fair Value 221,444 155,743
More than 12 Months, Unrealized Losses (41,684) (34,257)
Total, Fair Value 257,992 295,723
Unrealized Losses, Total (45,654) (43,512)
Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 82,386 347,529
Less than 12 Months, Unrealized Losses (3,537) (29,057)
More than 12 Months, Fair Value 1,119,167 972,645
More than 12 Months, Unrealized Losses (228,998) (211,716)
Total, Fair Value 1,201,553 1,320,174
Unrealized Losses, Total (232,535) (240,773)
Agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 36,548 73,362
Less than 12 Months, Unrealized Losses (3,970) (7,024)
More than 12 Months, Fair Value 145,684 127,193
More than 12 Months, Unrealized Losses (39,061) (32,244)
Total, Fair Value 182,232 200,555
Unrealized Losses, Total (43,031) (39,268)
Agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 68,272 328,590
Less than 12 Months, Unrealized Losses (3,433) (27,769)
More than 12 Months, Fair Value 1,069,156 929,581
More than 12 Months, Unrealized Losses (222,799) (206,192)
Total, Fair Value 1,137,428 1,258,171
Unrealized Losses, Total (226,232) (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 75,760 28,550
More than 12 Months, Unrealized Losses (2,623) (2,013)
Total, Fair Value 75,760 95,168
Unrealized Losses, Total (2,623) (4,244)
Non-agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 14,114 18,939
Less than 12 Months, Unrealized Losses (104) (1,288)
More than 12 Months, Fair Value 50,011 43,064
More than 12 Months, Unrealized Losses (6,199) (5,524)
Total, Fair Value 64,125 62,003
Unrealized Losses, Total $ (6,303) $ (6,812)