  We investigate the hidden-charm pentaquarks as superpositions of $\Lambda_c
\bar{D}^{(*)}$ and $\Sigma_c^{(*)} \bar{D}^{(*)}$ (isospin $I = 1/2$)
meson-baryon channels coupled to a $uudc\bar{c}$ compact core by employing an
interaction satisfying the heavy quark and chiral symmetries. Our model can
consistently explain the masses and decay widths of $P_c^+(4312)$,
$P_c^+(4440)$ and $P_c^+(4457)$ with the dominant components of $\Sigma_c \bar
D$ and $\Sigma_c \bar D^\ast$ with spin parity assignments $J^P = 1/2^{-},
3/2^{-}$ and $1/2^{-}$, respectively. We analyze basic properties of the
$P_c$'s such as masses and decay widths, and find that the mass ordering is
dominantly determined by the quark dynamics while the decay widths by the
tensor force of the one-pion exchange.
