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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, 2019
USD ($)
Securities
Dec. 31, 2018
USD ($)
Securities
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 114 223
Fair Value $ 449,944 $ 580,621
Less than 12 months 227 2,613
More than 12 months 5,293 9,603
Total Unrealized Losses $ 5,520 $ 12,216
U.S. treasuries and government agencies    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 27 33
Fair Value $ 186,675 $ 194,135
Less than 12 months 204 452
More than 12 months 1,682 3,578
Total Unrealized Losses $ 1,886 $ 4,030
State and municipal    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 9 80
Fair Value $ 8,724 $ 78,232
Less than 12 months 0 569
More than 12 months 37 212
Total Unrealized Losses $ 37 $ 781
Mortgage-Backed and asset-backed    
Schedule Of Available For Sale Securities [Line Items]    
Number of Securities | Securities 78 110
Fair Value $ 254,545 $ 308,254
Less than 12 months 23 1,592
More than 12 months 3,574 5,813
Total Unrealized Losses $ 3,597 $ 7,405