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
Mar. 31, 2023
Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 235,333 $ 1,285,632
Less than 12 Months, Unrealized Losses (13,453) (140,392)
More than 12 Months, Fair Value 1,980,304 1,392,153
More than 12 Months, Unrealized Losses (394,669) (322,446)
Total, Fair Value 2,215,637 2,677,785
Unrealized Losses, Total (408,122) (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 62,541 59,269
More than 12 Months, Unrealized Losses (6,900) (8,087)
Total, Fair Value 62,541 61,863
Unrealized Losses, Total (6,900) (8,253)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 25,482 588,668
Less than 12 Months, Unrealized Losses (1,225) (86,895)
More than 12 Months, Fair Value 490,011 187,375
More than 12 Months, Unrealized Losses (126,026) (65,806)
Total, Fair Value 515,493 776,043
Unrealized Losses, Total (127,251) (152,701)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 62,443 206,861
Less than 12 Months, Unrealized Losses (3,586) (15,019)
More than 12 Months, Fair Value 87,163 17,121
More than 12 Months, Unrealized Losses (16,307) (2,580)
Total, Fair Value 149,606 223,982
Unrealized Losses, Total (19,893) (17,599)
Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 21,945 139,980
Less than 12 Months, Unrealized Losses (3,119) (9,255)
More than 12 Months, Fair Value 228,314 155,743
More than 12 Months, Unrealized Losses (37,246) (34,257)
Total, Fair Value 250,259 295,723
Unrealized Losses, Total (40,365) (43,512)
Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 125,463 347,529
Less than 12 Months, Unrealized Losses (5,523) (29,057)
More than 12 Months, Fair Value 1,112,275 972,645
More than 12 Months, Unrealized Losses (208,190) (211,716)
Total, Fair Value 1,237,738 1,320,174
Unrealized Losses, Total (213,713) (240,773)
Agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 21,945 73,362
Less than 12 Months, Unrealized Losses (3,119) (7,024)
More than 12 Months, Fair Value 150,711 127,193
More than 12 Months, Unrealized Losses (34,610) (32,244)
Total, Fair Value 172,656 200,555
Unrealized Losses, Total (37,729) (39,268)
Agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 110,848 328,590
Less than 12 Months, Unrealized Losses (5,385) (27,769)
More than 12 Months, Fair Value 1,061,695 929,581
More than 12 Months, Unrealized Losses (201,971) (206,192)
Total, Fair Value 1,172,543 1,258,171
Unrealized Losses, Total (207,356) (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 77,603 28,550
More than 12 Months, Unrealized Losses (2,636) (2,013)
Total, Fair Value 77,603 95,168
Unrealized Losses, Total (2,636) (4,244)
Non-agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 14,615 18,939
Less than 12 Months, Unrealized Losses (138) (1,288)
More than 12 Months, Fair Value 50,580 43,064
More than 12 Months, Unrealized Losses (6,219) (5,524)
Total, Fair Value 65,195 62,003
Unrealized Losses, Total $ (6,357) $ (6,812)