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, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 2,298,675 $ 1,733,749
Less than 12 Months, Unrealized Losses (280,518) (28,409)
More than 12 Months, Fair Value 455,707 139,747
More than 12 Months, Unrealized Losses (72,242) (3,923)
Total, Fair Value 2,754,382 1,873,496
Unrealized Losses, Total (352,760) (32,332)
U.S. government and agency securities    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 62,470 64,474
Less than 12 Months, Unrealized Losses (5,882) (115)
More than 12 Months, Fair Value 3,199 3,900
More than 12 Months, Unrealized Losses (42) (45)
Total, Fair Value 65,669 68,374
Unrealized Losses, Total (5,924) (160)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 686,807 249,701
Less than 12 Months, Unrealized Losses (131,328) (2,020)
More than 12 Months, Fair Value 28,077 2,123
More than 12 Months, Unrealized Losses (11,474) (53)
Total, Fair Value 714,884 251,824
Unrealized Losses, Total (142,802) (2,073)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 162,871 21,134
Less than 12 Months, Unrealized Losses (6,484) (177)
More than 12 Months, Fair Value 0 703
More than 12 Months, Unrealized Losses 0 (1)
Total, Fair Value 162,871 21,837
Unrealized Losses, Total (6,484) (178)
Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 321,810 209,347
Less than 12 Months, Unrealized Losses (21,922) (4,366)
More than 12 Months, Fair Value 65,630 14,201
More than 12 Months, Unrealized Losses (8,915) (270)
Total, Fair Value 387,440 223,548
Unrealized Losses, Total (30,837) (4,636)
Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,064,717 1,189,093
Less than 12 Months, Unrealized Losses (114,902) (21,731)
More than 12 Months, Fair Value 358,801 118,820
More than 12 Months, Unrealized Losses (51,811) (3,554)
Total, Fair Value 1,423,518 1,307,913
Unrealized Losses, Total (166,713) (25,285)
Agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 237,590 175,588
Less than 12 Months, Unrealized Losses (19,318) (4,053)
More than 12 Months, Fair Value 48,976 3,172
More than 12 Months, Unrealized Losses (7,928) (162)
Total, Fair Value 286,566 178,760
Unrealized Losses, Total (27,246) (4,215)
Agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,002,897 1,140,701
Less than 12 Months, Unrealized Losses (110,921) (21,147)
More than 12 Months, Fair Value 346,933 106,104
More than 12 Months, Unrealized Losses (50,708) (3,190)
Total, Fair Value 1,349,830 1,246,805
Unrealized Losses, Total (161,629) (24,337)
Non-agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 84,220 33,759
Less than 12 Months, Unrealized Losses (2,604) (313)
More than 12 Months, Fair Value 16,654 11,029
More than 12 Months, Unrealized Losses (987) (108)
Total, Fair Value 100,874 44,788
Unrealized Losses, Total (3,591) (421)
Non-agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 61,820 48,392
Less than 12 Months, Unrealized Losses (3,981) (584)
More than 12 Months, Fair Value 11,868 12,716
More than 12 Months, Unrealized Losses (1,103) (364)
Total, Fair Value 73,688 61,108
Unrealized Losses, Total $ (5,084) $ (948)