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, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 1,733,374 $ 1,733,749
Less than 12 Months, Unrealized Losses (255,722) (28,409)
More than 12 Months, Fair Value 964,487 139,747
More than 12 Months, Unrealized Losses (252,145) (3,923)
Total, Fair Value 2,697,861 1,873,496
Unrealized Losses, Total (507,867) (32,332)
U.S. government and agency securities    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 58,670 64,474
Less than 12 Months, Unrealized Losses (8,726) (115)
More than 12 Months, Fair Value 2,896 3,900
More than 12 Months, Unrealized Losses (37) (45)
Total, Fair Value 61,566 68,374
Unrealized Losses, Total (8,763) (160)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 601,039 249,701
Less than 12 Months, Unrealized Losses (120,853) (2,020)
More than 12 Months, Fair Value 159,773 2,123
More than 12 Months, Unrealized Losses (76,333) (53)
Total, Fair Value 760,812 251,824
Unrealized Losses, Total (197,186) (2,073)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 219,904 21,134
Less than 12 Months, Unrealized Losses (14,111) (177)
More than 12 Months, Fair Value 8,788 703
More than 12 Months, Unrealized Losses (1,212) (1)
Total, Fair Value 228,692 21,837
Unrealized Losses, Total (15,323) (178)
Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 190,466 209,347
Less than 12 Months, Unrealized Losses (18,611) (4,366)
More than 12 Months, Fair Value 113,031 14,201
More than 12 Months, Unrealized Losses (22,213) (270)
Total, Fair Value 303,497 223,548
Unrealized Losses, Total (40,824) (4,636)
Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 663,295 1,189,093
Less than 12 Months, Unrealized Losses (93,421) (21,731)
More than 12 Months, Fair Value 679,999 118,820
More than 12 Months, Unrealized Losses (152,350) (3,554)
Total, Fair Value 1,343,294 1,307,913
Unrealized Losses, Total (245,771) (25,285)
Agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 113,687 175,588
Less than 12 Months, Unrealized Losses (15,734) (4,053)
More than 12 Months, Fair Value 92,435 3,172
More than 12 Months, Unrealized Losses (21,005) (162)
Total, Fair Value 206,122 178,760
Unrealized Losses, Total (36,739) (4,215)
Agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 606,805 1,140,701
Less than 12 Months, Unrealized Losses (88,065) (21,147)
More than 12 Months, Fair Value 668,275 106,104
More than 12 Months, Unrealized Losses (150,901) (3,190)
Total, Fair Value 1,275,080 1,246,805
Unrealized Losses, Total (238,966) (24,337)
Non-agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 76,779 33,759
Less than 12 Months, Unrealized Losses (2,877) (313)
More than 12 Months, Fair Value 20,596 11,029
More than 12 Months, Unrealized Losses (1,208) (108)
Total, Fair Value 97,375 44,788
Unrealized Losses, Total (4,085) (421)
Non-agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 56,490 48,392
Less than 12 Months, Unrealized Losses (5,356) (584)
More than 12 Months, Fair Value 11,724 12,716
More than 12 Months, Unrealized Losses (1,449) (364)
Total, Fair Value 68,214 61,108
Unrealized Losses, Total $ (6,805) $ (948)