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INVESTMENTS (Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities) (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Securities
Dec. 31, 2018
USD ($)
Securities
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 38 223
Fair Value $ 232,284 $ 580,621
Less than 12 months 1,185 2,613
More than 12 months 528 9,603
Total Unrealized Losses $ 1,713 $ 12,216
U.S. treasuries and government agencies    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 8 33
Fair Value $ 103,180 $ 194,135
Less than 12 months 1,133 452
More than 12 months 0 3,578
Total Unrealized Losses $ 1,133 $ 4,030
State and municipal    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 2 80
Fair Value $ 2,134 $ 78,232
Less than 12 months 0 569
More than 12 months 5 212
Total Unrealized Losses $ 5 $ 781
Mortgage-Backed and asset-backed    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 28 110
Fair Value $ 126,970 $ 308,254
Less than 12 months 52 1,592
More than 12 months 523 5,813
Total Unrealized Losses $ 575 $ 7,405