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, 2022
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value $ 2,052,814 $ 1,733,749
Less than 12 Months, Unrealized Losses (173,621) (28,409)
More than 12 Months, Fair Value 440,252 139,747
More than 12 Months, Unrealized Losses (45,602) (3,923)
Total, Fair Value 2,493,066 1,873,496
Unrealized Losses, Total (219,223) (32,332)
U.S. government and agency securities    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 64,366 64,474
Less than 12 Months, Unrealized Losses (3,972) (115)
More than 12 Months, Fair Value 3,604 3,900
More than 12 Months, Unrealized Losses (57) (45)
Total, Fair Value 67,970 68,374
Unrealized Losses, Total (4,029) (160)
Obligations of states and political subdivisions    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 533,491 249,701
Less than 12 Months, Unrealized Losses (79,311) (2,020)
More than 12 Months, Fair Value 31,225 2,123
More than 12 Months, Unrealized Losses (7,944) (53)
Total, Fair Value 564,716 251,824
Unrealized Losses, Total (87,255) (2,073)
Corporate and other bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 112,253 21,134
Less than 12 Months, Unrealized Losses (2,763) (177)
More than 12 Months, Fair Value 0 703
More than 12 Months, Unrealized Losses 0 (1)
Total, Fair Value 112,253 21,837
Unrealized Losses, Total (2,763) (178)
Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 262,778 209,347
Less than 12 Months, Unrealized Losses (13,071) (4,366)
More than 12 Months, Fair Value 59,667 14,201
More than 12 Months, Unrealized Losses (4,844) (270)
Total, Fair Value 322,445 223,548
Unrealized Losses, Total (17,915) (4,636)
Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,079,926 1,189,093
Less than 12 Months, Unrealized Losses (74,504) (21,731)
More than 12 Months, Fair Value 345,756 118,820
More than 12 Months, Unrealized Losses (32,757) (3,554)
Total, Fair Value 1,425,682 1,307,913
Unrealized Losses, Total (107,261) (25,285)
Agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 175,651 175,588
Less than 12 Months, Unrealized Losses (11,545) (4,053)
More than 12 Months, Fair Value 40,654 3,172
More than 12 Months, Unrealized Losses (4,047) (162)
Total, Fair Value 216,305 178,760
Unrealized Losses, Total (15,592) (4,215)
Agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 1,016,786 1,140,701
Less than 12 Months, Unrealized Losses (71,954) (21,147)
More than 12 Months, Fair Value 333,594 106,104
More than 12 Months, Unrealized Losses (31,894) (3,190)
Total, Fair Value 1,350,380 1,246,805
Unrealized Losses, Total (103,848) (24,337)
Non-agency | Commercial    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 87,127 33,759
Less than 12 Months, Unrealized Losses (1,526) (313)
More than 12 Months, Fair Value 19,013 11,029
More than 12 Months, Unrealized Losses (797) (108)
Total, Fair Value 106,140 44,788
Unrealized Losses, Total (2,323) (421)
Non-agency | Residential    
Debt and Equity Securities, FV-NI [Line Items]    
Less than 12 months, Fair Value 63,140 48,392
Less than 12 Months, Unrealized Losses (2,550) (584)
More than 12 Months, Fair Value 12,162 12,716
More than 12 Months, Unrealized Losses (863) (364)
Total, Fair Value 75,302 61,108
Unrealized Losses, Total $ (3,413) $ (948)