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INVESTMENTS (Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities) (Detail)
$ in Thousands
Mar. 31, 2020
USD ($)
Securities
Dec. 31, 2019
USD ($)
Securities
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 28 50
Fair Value $ 156,315 $ 343,143
Less than 12 months 5,196 2,756
More than 12 months 3,809 849
Total Unrealized Losses $ 9,005 $ 3,605
U.S. treasuries and government agencies    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 6 12
Fair Value $ 86,597 $ 151,132
Less than 12 months 3,624 2,211
More than 12 months 3,775 475
Total Unrealized Losses $ 7,399 $ 2,686
State and municipal    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 14 3
Fair Value $ 44,737 $ 7,227
Less than 12 months 1,428 37
More than 12 months 0 0
Total Unrealized Losses $ 1,428 $ 37
Mortgage-Backed and asset-backed    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 8 35
Fair Value $ 24,981 $ 184,784
Less than 12 months 144 508
More than 12 months 34 374
Total Unrealized Losses $ 178 $ 882