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INVESTMENTS (Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities) (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Securities
Dec. 31, 2018
USD ($)
Securities
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 50 223
Fair Value $ 343,143 $ 580,621
Less than 12 months 2,756 2,613
More than 12 months 849 9,603
Total Unrealized Losses $ 3,605 $ 12,216
Us Government Agencies Debt Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 12 33
Fair Value $ 151,132 $ 194,135
Less than 12 months 2,211 452
More than 12 months 475 3,578
Total Unrealized Losses $ 2,686 $ 4,030
U S States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 3 80
Fair Value $ 7,227 $ 78,232
Less than 12 months 37 569
More than 12 months 0 212
Total Unrealized Losses $ 37 $ 781
Mortgage Backed Securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 35 110
Fair Value $ 184,784 $ 308,254
Less than 12 months 508 1,592
More than 12 months 374 5,813
Total Unrealized Losses $ 882 $ 7,405